JP3688515B2 - Group communication device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a group communication device, and more particularly to a group communication device including a line control device that controls a plurality of radio zones composed of a base station and a mobile station and manages group communication.
[0002]
In group communication, a plurality of mobile stations form one group to perform interconnection communication, and a mobile station having a transmission right makes a call to another mobile station.
In such group communication, a control method for passing the transmission right to another mobile station is important.
[0003]
[Prior art]
As a conventional group communication apparatus, there is an RCR STD-39 communication system (STD-39 π / 4 shift QPSK modulation system) standardized by the Japan Radio Industry Association. This method will be described below.
[0004]
FIG. 43 shows a configuration example of a general group communication device 10. This group communication device 10 includes line control devices 11 ... 1n connected to each other, and base stations 21, 22, ..., 23, ..., base stations 24, 25 connected to these line control devices 11 ... 1n, respectively. , ..., 2n and base stations 21 to 23, ..., 24 to 2n, wireless zones (service zones) 21a to 23a, ..., mobile stations 31 to 32, ..., 35 to 36 located in 24a to 2na. , ..., 37 to 38, ..., 3i to 3n.
[0005]
Further, the line control devices 11... 1n are generally connected to an extension telephone and a communication console via a PBX, respectively, and a command console is commonly connected.
The mobile stations 31 to 3n have a group number of a communication group to which the mobile station 31 belongs in advance in addition to the individual number assigned to each mobile station.
[0006]
In this group communication device 10, one of a plurality of mobile stations constituting a group is a speaker (hereinafter referred to as a transmitting station), and all other mobile stations are listeners (hereinafter referred to as receiving stations). It is.
Hereinafter, the operation of the group communication apparatus 10 will be described using the communication phase of FIG.
[0007]
In the communication phase shown in the figure, the mobile stations 31 and 32 and the mobile stations 33 and 34 located in the service zones 21a and 22a of the base stations 21 and 22 shown in FIG. 43 belong to the same communication group A, respectively. It is assumed that.
In FIG. 44, when a group communication call request for the target group A is generated, the mobile station 31 performs a call operation and performs “group communication call request message = I (outgoing radio status report, −, simple call setting)”. Is transmitted to the base station 21 located in the area. At this time, the group A group number is transmitted to the base station 21 in the message (step S01 in the figure).
[0008]
The base station 21 notifies the line control device 11 that there has been a “group communication request” for group A from the mobile station 31 (S02).
The line controller 11 searches the base station service zone to which the mobile stations 32, 33 and 34 to which the group A belongs is located by using the home location register (HLR). Then, it is recognized that the mobile station 32 and the mobile stations 33 and 34 belonging to the group A are located in the base stations 21 and 22, respectively.
[0009]
Therefore, the line control device 11 transmits a group communication call [UI (paging,-, communication form)] to the mobile stations 32, 33, and 34 via the base stations 21 and 22 (S04).
Further, the line control device 11 uses the channel designation [UI (radio channel designation,-, call setting)] to specify the communication channel (frequency and slot) used for group communication via each base station 21 and 22 via the mobile station 32. , 33 and 34 (S05).
[0010]
The mobile stations 31, 32, 33 and 34 switch to the notified call channel (S06).
The base stations 21 and 22 transmit a synchronization burst signal SB1 for the mobile station to establish synchronization with the communication channel for a certain period of time in the specified channel (S07).
[0011]
FIG. 45 shows the format of the synchronization burst signal SB1. (1) in the figure shows the configuration of the uplink synchronous burst signal SB1, and includes a guard time G before and after the frame, a linearizer preamble LP, a burst transient response guard time R, a preamble P, a synchronization word SW, and a tail bit Q. Consists of a parameter part, including.
[0012]
The number in the frame indicates the number of bits (hereinafter the same).
(2) in the figure shows the format of the downlink synchronization burst signal SB1, and this frame differs from the frame in (1) in that there is no preceding and following guard time G and linearizer preamble LP, and preamble P Is increased to 102 bits, and a postamble Post is added.
[0013]
The parameter portion of the uplink synchronization burst signal includes an idle bit I, a color code CC, a burst identification bit B, a time alignment amount TA, a superframe synchronization counter SSC, and a call code ID.
The parameter part of the downlink synchronization burst signal is different only in that the idle bit I of the parameter part of the uplink signal SB1 is replaced with the control channel communication information CI.
[0014]
FIG. 3 (3) shows the set value of burst identification bit B, which is set to “0” for initial synchronization burst signals SB1 and SB2 for establishing frame synchronization, for time alignment adjustment and for superframe synchronization establishment. It is set to “1” for the completion synchronization burst signals SB3 and SB4.
[0015]
The base stations 21 and 22 switch to the communication physical channel after transmission for a certain time (S08).
The mobile stations 31, 32, 33 and 34 receive the downlink initial synchronization burst signal SB1 or the call CH, and establish synchronization. A mobile station that has successfully established synchronization becomes a receiving station in the group.
[0016]
FIG. 46 shows a format of a communication physical channel. As shown in FIG. 1A, the upstream communication physical channel is a 6-bit burst transient response guard time R, a 2-bit preamble P, a 148-bit traffic channel (TCH: hereinafter referred to as a call CH). A) 20-bit synchronization word SW, 2-bit idle bit I, 6-bit color code CC, 20-bit slow ACCH or RCH, 108-bit traffic channel TCH, and 8-bit guard time G Yes.
[0017]
As shown in (2) of the figure, the physical channel for downlink communication has almost the same configuration as the uplink physical channel shown in (1) of the figure, but the number of bits of the first traffic channel TCH and the next traffic channel TCH. Are 112 and 144 bits, respectively, that 2-bit control channel communication information CI is inserted instead of idle bit I, and 8-bit busy / idle bit B / I is substituted for guard time G. What is added is different.
[0018]
When switching to this communication physical channel, if none of the mobile stations 31, 32, 33 and 34 has acquired the transmission right, the busy / idle bit B / I (hereinafter referred to as “(2)”). B / I bit) is set to idle I.
FIG. 3 (3) shows the set values of the B / I bit, and the set values of busy B and idle I are “11111111” and “00000000”, respectively.
[0019]
Idle I indicates a state where the mobile station is accessible, and busy B indicates a state where the mobile station is not accessible. Hereinafter, these states are referred to as “I state” or “access permission state” and “B state” or “access non-permission state”, respectively.
FIG. 44 (2) shows a communication phase in which the mobile station acquires the transmission right and becomes the transmitting station. For example, when the mobile station 31 is turned on to become a transmitting station (step S10 in the figure), first, referring to the B / I bit notified from the base station 21, B / I = I Confirm that it is in (access permission status).
[0020]
The mobile station 31 transmits the uplink synchronization burst signal SB2 to the base station 21. At this time, the mobile station 31 transmits the call code ID on the synchronization burst signal SB2 to the base station 21 (S11).
FIG. 45 (4) shows the structure of the call code ID, which is composed of an identifier and a mobile station individual number. Identifier = “1” means individual, and identifier = “0” means group.
[0021]
When the base station 21 receives the uplink synchronization burst signal SB2 with the B / I bit set to “I (access permitted)”, the base station 21 stops sending the B / I bit = “I” of the call CH, and synchronizes the burst with the downlink channel. The signal SB3 is transmitted to the mobile station 31 (step S12 in FIG. 44 (2)).
At this time, the base station 21 transmits the call code ID received by the uplink synchronization burst signal SB2 on the downlink synchronization burst signal SB3 to the mobile station 31 and measures the transmission delay time of the received uplink synchronization burst signal SB2. Then, a time alignment amount TA having the delay time as the mobile station transmission timing adjustment amount is transmitted on the downlink synchronization burst signal SB3 and transmitted to the mobile station 31.
[0022]
When the mobile station 31 is transmitting the synchronization burst signal SB2 and receives the downlink synchronization burst signal SB3, the call code ID of the restored information matches the call code ID of the local station transmitted by the synchronization burst signal SB2. Then, the transmission of the uplink synchronization burst signal SB2 is stopped, and the transmission of the uplink synchronization burst signal SB4 is started (S13).
[0023]
At this time, the time alignment amount TA received by the downlink synchronization burst signal SB3 is also returned by the uplink synchronization burst signal SB4.
When receiving the uplink synchronization burst signal SB4, the base station 21 refers to the time alignment amount TA received by the uplink synchronization burst signal SB4, and the time alignment amount TA matches the time alignment amount specified by the downlink synchronization burst signal SB3. In this case, the transmission of the downlink synchronization burst signal SB3 is stopped, and the transmission of the downlink call CH in the format of FIG. 46 (2) is started (step S14 of FIG. 44 (2)).
[0024]
At this time, B / I of the call CH = “B = 11111111 (access non-permitted state)” is set and transmitted to the mobile station 31.
The mobile station 31 receives the downlink call CH, stops transmitting the uplink synchronization burst signal SB4, and starts transmitting the uplink call CH (voice) to the base station 21 (S15).
[0025]
The base station 21 receives the uplink call CH and recognizes that the mobile station 31 has been given a transmission right.
When the base station 21 grants the transmission right to the mobile station 31, the line control device 11 and the base station 21 prevent the mobile station located under the base station 22 that performs group A group communication from acquiring the transmission right. Call CH (voice) [B / I = B (access not permitted)] is notified to the mobile stations 33 and 34 via the station 22 (S16).
[0026]
After the transmission is completed, the mobile station 31 that has become the transmission station turns off the press switch for the next transmission station (S17 in the same), and displays “transmission right release message = UI (transmission right release, −, −)”. Transmission is made to the base station 21 (S18).
The base station 21 sets B / I = “I = 00000000 (access permission state)” of the downlink call CH of the channel to transmit to the mobile stations 31 and 32.
[0027]
Similarly, the B / I bit = I (access permission) of the call CH is notified to the base station 22 via the line controller 11 so that the mobile station under the base station 22 can acquire the transmission right (S19 ).
The base station 22 stops the transmission of the B / I bit = “B” of the call CH and transmits the B / I bit = “I” of the call CH to the mobile stations 33 and 34.
[0028]
Similarly, the base station 21 transmits the B / I bit = “I” of the call CH to the mobile stations 31 and 32.
[0029]
[Problems to be solved by the invention]
In such a conventional group communication apparatus, since the receiving station has no means to notify the transmitting station and the base station that there is emergency communication for the group, the base station forcibly grants the transmission right. Neither can it be released, nor can it be notified to the transmitting station to request release of the transmission right. Therefore, unless the transmitting station releases the transmission right, the mobile station that is another receiving station cannot acquire the transmission right.
[0030]
In addition, in a wireless zone where the transmitting station is not located, the uplink channel is vacant, so it is possible to notify the base station that it is an emergency communication. Since it is not notified, there is a possibility that an emergency communication request is transmitted without knowing that in the radio zone where the transmitting station exists. In this case, there is a possibility that an emergency communication request may not be transmitted due to mutual interference with the transmitting station.
[0031]
Therefore, when the necessity of emergency communication occurs at the receiving station of the communication group, there is a problem that the emergency communication waits until the transmitting station releases the transmission right.
Therefore, the present invention provides a group communication apparatus having a line control apparatus that controls a plurality of radio zones composed of a base station and a mobile station and manages group communication, and a mobile station to which a transmission right is given is communicating. In this case, it is an object to provide a group communication device in which other mobile stations can perform emergency communication.
[0032]
[Means for Solving the Problems]
In order to solve the above-described problem, a group communication device according to the first aspect of the present invention provides:
Each base station notifies a mobile station located in its own radio zone whether or not a transmission station, which is a mobile station to which a transmission right is granted, is located in the same radio zone. When the mobile station is in a radio zone different from the radio zone of the transmitting station, it issues an emergency communication request via a communication line, and when the line control device detects the emergency communication request, the transmission of the transmitting station It is characterized by forcibly releasing rights.
[0033]
That is, each base station notifies each mobile station located in its own wireless zone whether or not the transmitting station is located in its own wireless zone (service zone). Based on this notification, the mobile station that has recognized that it is located in a different radio zone from the transmitting station issues an emergency communication request via the communication line when emergency communication becomes necessary. The line control device that has detected this emergency communication request forcibly releases the transmission right of the transmission station.
[0034]
Accordingly, a mobile station located in another wireless zone that has issued an emergency communication request can perform emergency communication by pressing an emergency communication switch, for example.
Further, in the present invention according to claim 2, the line control device has means for notifying the transmitting station that the emergency communication request has been made, instead of forcibly releasing the transmission right. be able to.
[0035]
That is, in the present invention of claim 1, the line control device that has detected the emergency communication request notifies the transmitting station that there has been an emergency communication request. Upon receiving this notification, the transmitting station releases the transmission right.
As a result, the mobile station that has issued the emergency communication request can perform emergency transmission by pressing an emergency communication switch, for example.
[0036]
In the present invention according to claim 3, the line control device may include a timer forcibly releasing the transmission station when the transmission right is not released for a predetermined time or more.
That is, in the present invention of claim 3, the line control apparatus notifies the transmitting station that there is an emergency communication request and starts a timer. If the transmitting station does not release the transmission right despite receiving the notification, the transmission right is forcibly released when a predetermined time elapses and time-out occurs.
[0037]
As a result, for example, even when the transmission station ignores or cannot recognize the notification, it is possible to release the transmission right and interrupt the call.
In the present invention according to claim 4, the mobile station is located in the same radio zone as the transmitting station, and issues the emergency communication request via a control line of the located radio zone. It is possible.
[0038]
That is, based on the notification from the base station, the mobile station recognizes that the mobile station is in the same wireless zone as the transmitting station, and issues the emergency communication request via the control line. The line control device that has detected the emergency communication request forcibly releases the transmission right of the transmission station, notifies the transmission station that there is an emergency communication request, or a predetermined time has elapsed. The transmission right is forcibly released.
[0039]
As a result, the mobile station that has issued the emergency communication request can perform emergency transmission by pressing an emergency communication switch, for example.
In the present invention according to claim 5, the mobile station may issue the emergency communication request via a control line of a radio zone adjacent to the existing radio zone instead of the control line. Is possible.
[0040]
That is, when the mobile station is in the same wireless zone as the transmitting station, for example, when the control line cannot be used, the mobile station issues an emergency communication request via the control line of the adjacent wireless zone. The line control device that has received this emergency communication request forcibly releases the transmission right of the transmission station as described above, or notifies the transmission station that there is an emergency communication request, or The transmission right is forcibly released when a predetermined time has elapsed.
[0041]
As a result, the mobile station that has issued the emergency communication request can perform emergency transmission.
Further, in the present invention according to claim 6, the mobile station issues the emergency communication request via a telephone line different from the telephone line used by the transmitting station, instead of the control line. Can do.
[0042]
In other words, when a control line cannot be used, for example, a mobile station located in the same wireless zone as the transmitting station can switch over a call line different from the call line used by the transmitter station by switching the call line, for example. The emergency communication request is issued.
The line control device that has received this emergency communication request forcibly releases the transmission right of the transmission station as described above, or notifies the transmission station that there is an emergency communication request, or The transmission right is forcibly released when a predetermined time has elapsed.
[0043]
As a result, the mobile station that has issued the emergency communication request can perform emergency transmission.
Further, in the present invention according to claim 7, the line control device has means for notifying the mobile station that has made the emergency communication request when the transmission right of the transmission station is released. it can.
[0044]
In other words, the notification means of the line control device indicates that the transmission right of the transmitting station is released when it is forcibly released by notification, or forcibly after a predetermined time has elapsed. Notify the mobile station that made the emergency communication request.
The mobile station that has made an emergency communication request knows the timing to acquire the transmission right upon receiving the notification, and can make an emergency communication by pressing an emergency communication switch, for example.
[0045]
In the present invention according to claim 8, the line control device grants a transmission right to a mobile station other than the mobile station that has made the emergency communication request for a certain period of time after the transmission right is released. It is possible not to.
That is, the line control device does not accept an emergency communication request from a mobile station other than the mobile station that has made the emergency communication request for a certain period of time after the transmission right is released.
[0046]
As a result, the mobile station that has made the emergency communication request can acquire the transmission right without competing with other mobile stations and perform emergency communication.
In the present invention according to claim 9, the mobile station may have a display unit for displaying the notification.
[0047]
That is, the display unit of the mobile station that is the transmitting station displays that there is an emergency communication request. The display unit of the mobile station that has made the emergency communication request displays that the transmission right has been released.
As a result, the operator of the transmitting station can easily recognize the emergency communication request, and the operator of the mobile station that has made the emergency communication request can easily recognize that the transmission right has been released.
[0048]
In the present invention according to claim 10, the base station can further notify whether or not the transmission right is reserved by the emergency communication request.
That is, the base station further notifies whether or not the transmission right is reserved by the emergency communication request.
[0049]
Thereby, only the mobile station that has requested the transmission right by the emergency communication request can acquire the transmission right.
In the present invention according to claim 11, the base station can have a timer for canceling the reservation of the transmission right after a predetermined time elapses.
[0050]
That is, in claim 10, when the base station reserves the transmission right by the emergency communication request and does not make a request for acquiring the transmission right for a predetermined time, the reservation is made. Is solved.
Thereby, after the predetermined time elapses, other mobile stations can request and acquire the transmission right.
[0051]
In the present invention according to claim 12, the base station can further notify the own station whether or not the mobile station may make a normal transmission right request.
That is, the base station notifies the mobile station located in the service zone of its own station whether or not a normal non-emergency transmission right request may be made.
[0052]
As a result, the mobile station can know when to request a normal transmission right. Furthermore, in the present invention according to claim 13, each base station has the timer instead of the line control device.
That is, in the above-described third aspect, each base station has a timer, and the base station notifies the transmitting station in the area that there is an emergency communication request and starts the timer. If the transmitting station does not release the transmission right despite receiving the notification, the transmission right may be forcibly released when a predetermined time elapses and time-out occurs.
[0053]
DETAILED DESCRIPTION OF THE INVENTION
Example (1)
FIG. 1 shows an embodiment (1) of a group communication apparatus 10 according to the present invention.
In this embodiment (1), the line control device 11, the base stations 21 and 22 of the group communication device 10 shown in FIG. 43, and the mobile stations 31 and 33 located in these service zones (radio zones) 21a and 22a. Is shown in more detail.
[0054]
In the embodiments (1) to (13) according to the present invention described below, the mobile stations 31, 32, 33, and 34 belong to the same communication group A in the group communication apparatus 10 shown in FIG. In particular, a case where the mobile station 31 is a transmitting station will be described.
Further, the embodiments (1) to (12) correspond to the modification examples shown in the correspondence table of the embodiment, the used channel and the transmission right releasing method in FIG.
[0055]
That is, in Examples (1) to (3), Examples (4) to (6), Examples (7) to (9), and Examples (10) to (12) It shows a case where there is no CH, control CH (control line) communication, CCH in the adjacent zone, CCH in the adjacent zone, and another call CH.
Examples (1), (4), (7), and (10), Examples (2), (5), (8), and (11), and Examples (3), (6) , (9), and (12) are: when the transmission right is released immediately, when it is released after notifying that there is an emergency communication, and when it is forcibly released after a certain period of time after waiting for release. It corresponds. The embodiment (13) is a further modification of the modification.
[0056]
In FIG. 1, the line control device 11 is composed of commonly connected message transmission / reception units 11-1 and 11-2, a transmission right control unit / transmission right granting unit 11-3, and an emergency communication processing unit 11-4. The transmission / reception units 11-1 and 11-2 are connected to the base stations 21 and 22, respectively.
The base station 21 includes transmission / reception units 21-1 to 21-4 connected to a transmission antenna 21-11 and a reception antenna 21-12 via a duplexer 21-10, and a common control unit 21-5. ing.
[0057]
The common control unit 21-5 includes a transmission right acquisition control unit 21-6 commonly connected to the transmission / reception units 21-1 to 21-4, a TCH_B / I control unit / transmission station presence / absence control unit 21-7, and message control. Unit 21-8 and a message transmission / reception unit 21-9 connected to the control units 21-6 to 21-8 and connected to the message transmission / reception unit 11-1.
[0058]
The base station 22 has the same configuration as the base station 21 except that the message transmission / reception unit 22-9 is connected to the message transmission / reception unit 11-2.
The mobile station 31 includes a reception unit 31-1 connected to the reception antenna 31-22, a reception unit 31-2 connected to the transmission / reception antenna 31-23 via the duplexer 31-21, and a power amplification unit 31- 20, a transmitter 31-3 connected to the power amplifier 31-20, receivers 31-1, 31-2, and a frame disassembly / assembly controller 31-4 connected to the transmitter 31-3, this control Unit 31-4, receiver (RECV) 31-6, voice I / F unit 31-5 connected to microphone (MIC) 31-7, and control unit 31-19.
[0059]
The control unit 31-19 includes a TCH_B / I detection unit / transmission station presence / absence detection unit 31-11, a transmission right acquisition control unit 31-12, an emergency communication request message generation / transmission unit 31-, which are commonly connected to the control unit 31-4. 13, transmission right release control unit 31-14, LCD display control unit 31-15, emergency display control unit 31-16, press ON / OFF detection unit 31-17, and emergency communication request detection unit 31-18 Yes.
[0060]
The LCD 31-8, the press switch 31-9, and the emergency communication switch 31-10 are connected to the control unit 31-15, the detection unit 31-17, and the detection unit 31-18, respectively.
Other mobile stations 33, mobile stations 32 (not shown), and mobile stations 34 (not shown) belonging to the communication group A have the same configuration as the mobile station 31.
[0061]
The detection units 31-11 to 34-11 of the mobile stations 31 to 34 and the control units 21-7 and 22-7 of the base stations 21 and 22 have B / I information, respectively, and the mobile stations 31 to 34 The message generation and transmission units 31-13 to 34-13 respectively have emergency communication presence / absence information, and the transmission right control unit / transmission right granting unit 11-3 and the emergency communication processing unit 11-4 of the line control device 11 Each has transmission right information and emergency communication presence / absence information.
[0062]
3 and 4 show communication phases (part 1) and (part 2) of the whole embodiment (1) shown in FIG. 1, respectively. FIGS. 5 to 7 are operation flowcharts (parts 1 to 2) on the mobile station side. 8 to 10 show operation flowcharts (parts 1 to 3) on the base station side, FIG. 11 shows bit allocation of each information, and FIG. 12 shows an emergency communication request message and its A response message is shown.
[0063]
The flowcharts of FIGS. 5 to 10 collectively show the flows of the embodiments (1) to (13). For example, steps P13 and P14 are connected by a solid line in the flowchart of FIG. P15 is connected with a broken line. In the case of the embodiments (1) to (3), this is executed by the route of the solid line, and in the case of the embodiment (13), it is executed by the route of the broken line.
[0064]
The specific operation of the embodiment (1) will be described below with reference to FIGS.
In the embodiment (1), when the mobile station 31 having a transmission right is talking, the mobile station 33 located in a different zone from the mobile station 31 makes a request for emergency communication and forcibly obtains the transmission right. .
[0065]
The numbers enclosed in parentheses below correspond to the numbers in parentheses in FIG. However, the number does not necessarily indicate the order of processing.
3 and 4, the signal transmission / reception step between the devices may be omitted.
[0066]
Below, the access permission state of a mobile station and a base station is demonstrated.
(1) When there is a group communication call request or call reception request, the mobile stations 31 and 32 circulate through the “NO” paths in steps P6 and P7 through steps P1 to P5 in FIG. It is in an “access permission state” that is a state waiting for a press switch ON or a state waiting for an “emergency communication request”.
[0067]
Similarly, the base stations 21 and 22 circulate through the “NO” route of steps Q5 and Q6 via steps Q1 to Q4 in FIG. 3 is in the “access permission state” waiting for “TCH [B / I = B (no transmission station)] transmission request” (step S08 in FIG. 3).
[0068]
These steps P1 to P5 and Q1 to Q4 are the same as the conventional steps S01 to S08 shown in FIG.
FIG. 11 (1) shows “access status information” of the B / I bit of the radio frame (communication physical channel) in the present invention, and the setting value of this information is the conventional value shown in FIG. 46 (3). It is different from the set value.
[0069]
That is, the “access state” is divided into four “access non-permitted state (within-zone transmitting station)”, “access non-permitted state (within-zone transmitting station)”, “access permitted state (transmitting right reserved)” It is classified into “access permission state”, and set values of “11111111”, “11110000”, “00001111”, and “00000000” are assigned to each.
[0070]
Hereinafter, these states may be referred to as “B (with transmission station)”, “B (without transmission station)”, “I (with transmission right reserved)”, and “I (access permission)”, respectively.
The communication phase of step S08 in FIG. 3 is “access permission state (“ I ”=“ 00000000 ”)” similar to “access permission state: TCH_B / I = I” in step S08 of FIG. 44 (1). is there.
[0071]
The following description will focus on the operation when the mobile station 31 acquires a transmission right according to the communication phase of FIG.
Note that the step number P in the mobile station flowcharts in FIGS. 5 to 8 and the step number Q in the base station flowcharts in FIGS. 9 to 11 are referred to without showing the figure numbers.
[0072]
(2) Press the press switch 31-9 (step S19 in FIG. 3).
(3) The press ON / OFF detector 31-17 detects that the press switch 31-9 has been pressed (YES in step P6).
(4) The control unit 31-12 creates synchronous burst data in order to acquire a transmission right.
[0073]
(5) The frame disassembly / assembly control unit 31-4 creates a frame for wirelessly transmitting the created synchronous burst data.
(6) The transmission unit 31-3 transmits the created radio frame to the base station 21 via the power amplification unit 31-20, the duplexer 31-21, and the transmission antenna 31-23.
[0074]
(7) In the base station 21, the transmission / reception unit 21-2 receives the synchronous burst data transmitted from the mobile station 31 via the reception antenna 21-12 and the duplexer 21-10.
(8) The transmission right acquisition control unit 21-6 exchanges synchronous burst data (transmission right acquisition request) according to the group communication phase (YES in step Q5, steps S20 to S22 in FIG. 3).
[0075]
(9) The message transmitting / receiving unit 21-9 transmits a “transmission right acquisition request message” to the line control device 11 (step Q7).
(10) In the line control device 11, the message transmitting / receiving unit 11-1 receives the “transmission right acquisition request message”.
[0076]
(11) The transmission right information in the transmission right control unit / transmission right granting unit 11-3 is set to “transmission right granting = 01”.
FIG. 11 (2) shows the set values of the transmission right information, and “00” and “01” are assigned to “transmission right not being granted” and “transmission right being granted”, respectively.
[0077]
(12) The transmission / reception unit 11-1 notifies the base station 21 that the transmission right has been granted by using a “transmission right acquisition response message”.
(13) The transmission / reception unit 21-9 receives the “transmission right acquisition response message”.
(14) The TCH_B / I control unit / transmission station presence / absence control unit 21-7 sets the B / I information to “B (with transmission station) = 10” (step Q8).
[0078]
As a result, the base station 21 enters a “transmission right granting” state that circulates NO in steps Q9 and Q10.
FIG. 11 (3) shows the set values of the B / I information. “Idle I”, “Busy B (without transmitting station)”, “Busy B (with transmitting station)”, and “Idle I (transmitted) “00”, “01”, “10”, and “11” are assigned to the state of “reserving rights”.
[0079]
This set value is the same for the B / I information included in the control unit 22-7 and the detection units 31-11 and 33-11.
In addition, “Idle I”, “Busy B (no transmission station)”, “Busy B (with transmission station)”, and “Idle I (transmission right reserved)” of the B / I information respectively indicate B of the radio frame. The / I bit corresponds to “I”, “B (no transmission station)”, “B (with transmission station)”, and “I (transmission right reserved)”.
[0080]
(15) The transmission / reception unit 21-2 creates a radio frame in which the B / I bit = “B (with transmission station) = 11111111”.
(16) Then, the mobile station 31 and 32 are notified of the “B (with transmitting station)” information via the duplexer 21-10 and the transmitting antenna 21-11 (step S23 in FIG. 3).
[0081]
That is, the base station 21 notifies the mobile stations 31 and 32 that the transmission right is granted to the mobile station 31 located in the service zone of the own station.
(17) In the mobile station 31, the receiving units 31-1 and 31-2 receive a radio frame via the receiving antenna 31-22. The frame disassembly / assembly control unit 31-4 extracts “B (with transmitting station)” information from the B / I bit of the radio frame.
[0082]
(18) The B / I information of the TCH_B / I detection unit / transmission station presence / absence detection unit 31-11 is set to “B (with transmission station) = 10”. As a result, the mobile station 31 enters a transmission state that circulates NO in steps P20 and P21.
(19) The LCD display control unit 31-15 performs control to display that the transmission right has been acquired.
[0083]
(20) The LCD 31-8 displays that the transmission right has been acquired. The operator of the mobile station 31 makes a call knowing that the transmission right has been acquired (step S24 in FIG. 3).
(21) On the other hand, in the line control device 11, the message transmission / reception unit 11-2 indicates that the transmission right is granted to the other base station 21 “TCH_B / I control message = TCH [B / I = B] transmission request”. To the base station 22.
[0084]
(22) In the base station 22, the message transmitting / receiving unit 22-9 receives the “TCH_B / I control message”.
(23) Then, the TCH_B / I control unit / transmission station presence / absence control unit 22-7 sets the B / I information to “B (no transmission station) = 01” (step Q13).
[0085]
As a result, the base station 22 enters an access non-permitted state (a) that circulates NO in steps Q14, Q15, and Q17.
(24) The transmission / reception unit 22-3 creates a radio frame in which the B / I bit is set to “B (no transmission station) = 11110000”.
[0086]
(25) The B / I bit = B (no transmission station) is notified to the mobile stations 33 and 34 (step S25 in FIG. 3). That is, the base station 22 notifies the mobile stations 33 and 34 that the transmission right is not granted to the mobile station located in the service zone of the own station.
(26) In the mobile station 33, the receiving units 33-1 and 33-2 receive the radio frame, and the frame disassembly / assembly control unit 33-4 extracts the B / I bit of “B (no transmitting station)” To do.
[0087]
(27) Then, the TCH_B / I detection unit / transmission station presence / absence detection unit 33-11 sets the B / I information to “B (no transmission station) = 01”.
Similarly, the detection unit 34-11 of the mobile station 34 sets the B / I information to “B (no transmission station) = 01”. As a result, the mobile stations 33 and 34 enter an access non-permitted state that circulates NO in steps P8 and P9.
[0088]
(28) The LCD display control unit 33-15 performs control for displaying that another mobile station has acquired the transmission right.
(29) The LCD 33-8 displays that another mobile station has acquired the transmission right.
Steps S26 to S28 in FIG. 3 are communication phases when the mobile station 31 releases the press switch 31-9 to release the transmission right, and are the same as steps S17 to S19 in FIG. 44 (2).
[0089]
That is, the mobile station 31 has access to which the press switch 31-9 is turned off in step P20 in the transmission state, and after the transmission right release process in step P23, the NO in step P6 and P7 are circulated via the NO in step P5. It becomes permission state.
The base station 21 sets the B / I information to “I” in step Q12 after executing the transmission right release process in step Q11 from the transmission right granting state in steps Q9 and Q10, and permits the access in steps Q5 and Q6. It becomes a state.
[0090]
The operation of transmitting an emergency communication request message during group communication will be described below according to the communication phase of FIG.
(30) When emergency communication is required for the mobile station 33, the operator presses the emergency communication switch 33-10 (step S30 in the figure).
[0091]
(31) The emergency communication request detection unit 33-18 detects that the emergency communication switch 33-10 is pressed (YES in Step P9), and executes transmission right acquisition processing (YES in Steps P10 and P11). S31 to S34). That is, a synchronous burst is exchanged between the base stations 22 to confirm that the B / I information of the downlink call CH = “B (no transmitting station)” (YES in step Q14, Q27).
[0092]
(32) The emergency communication request message generation and transmission section 33-13 sets the emergency communication presence / absence information to “emergency communication request present” = “01”, and generates an “emergency communication request message”.
FIG. 11 (4) shows the setting value of the emergency communication presence / absence information, and “00” and “01” are assigned to the states of “no emergency communication request” and “emergency communication requested”, respectively. . This set value is the same as the set value of the emergency communication presence / absence information of the emergency communication processing unit 11-4.
[0093]
(33) The frame disassembly / assembly control unit 33-4 creates a frame for wirelessly transmitting the generated “emergency communication request message”.
FIG. 12 (1) shows a format of an “emergency communication request message”, and this message includes a message type, a group number, and zone information as information elements.
[0094]
(2) indicates a group number, which is composed of 4-bit “0000” and a 20-bit group number.
(3) shows zone information, which is composed of a control zone number for identifying a control zone and a base station number for identifying a base station.
[0095]
(34) The transmitting unit 33-3 transmits “emergency communication request message = UI (emergency communication request, −, −)” using the SACCH or FACCH field of the uplink call CH shown in FIG. 46 (1) ( Step P12, step S35 in FIG. 4).
(35) In the base station 22, the transmission / reception unit 22-3 receives a radio frame.
[0096]
(36) The message control unit 22-8 detects that the “emergency communication request message” has been received (step Q28).
(37) The message transmission / reception unit 22-9 returns “emergency communication request response message = UI (emergency communication request response, −, −)” to the mobile station 33 (steps Q29 and P13), and “emergency communication request message” ”Is transmitted to the line control apparatus 11 (step Q30, step S36 in FIG. 4).
[0097]
As a result, the mobile station 33 enters the emergency communication processing (a1) state of step P14.
FIG. 12 (4) shows a format of an “emergency communication request response message”, which includes a message type (= emergency communication request response) as an information element.
The operation from the reception of the “emergency communication request message” to the release of the transmission right of the mobile station 31 is described below.
[0098]
(38) In the line control device 11, the message transmitting / receiving unit 11-2 receives the “emergency communication request message”.
(39) The emergency communication processing unit 11-4 sets the emergency communication presence / absence information to “emergency communication requested = 10”.
[0099]
(40) The message transmitting / receiving unit 11-1 transmits a “transmission right deprivation request message” for releasing the transmission right to the base station 21 where the transmission station exists (step S37 in FIG. 4).
(41) In the base station 21, the message transmitting / receiving unit 21-9 receives the message for releasing the transmission right (YES in step Q10).
[0100]
(42) The control unit 21-7 sets the B / I information to “I = 00” (step Q12) and enters an access-permitted state.
(43) The transmission / reception unit 21-2 creates a radio frame in which the B / I bit is set to “I = 00000000 (access permission state)”.
[0101]
(44) Then, the “access permission state” is notified to the mobile station 31 (S38 in the figure).
(45) In the mobile station 31, the receiving units 31-1 and 31-2 receive the radio frame, and the frame disassembly / assembly control unit 31-4 extracts the B / I bit of “I (access permission)” To do.
(46) The detecting unit 31-11 sets the B / I information to “I = 00 (access permission state)” (YES in step P21, YES in P5). As a result, the mobile station 31 enters the access permission state in steps P6 and P7.
[0102]
(47) The LCD display control unit 31-15 performs control for displaying that the transmission right is released.
(48) The LCD 31-8 displays that the transmission right has been released.
Hereinafter, the B / I control of the base station 22 by receiving the emergency communication message will be described.
[0103]
(49) In the line control device 11, the message transmission / reception unit 11-2 transmits a message for releasing the transmission right to the base station 22 (S39 in the figure).
(50) In the base station 22, the message transmission / reception unit 22-9 receives the message (YES in step Q21).
[0104]
(51) The control unit 22-7 sets the B / I information to “I = 00” (step Q22). As a result, the base station 22 enters an access permission state.
(52) The transmission / reception unit 21-2 creates a radio frame in which the B / I bit is set to “I = 00000000 (access permission state)”.
[0105]
(53) Then, "I (access permission)" is notified to the mobile stations 33 and 34 (S40 in the figure).
(54) The receiving units 31-1 and 31-2 receive the radio frame, and the frame disassembly / assembly control unit 31-4 extracts “I (access permission)” information of the B / I bit.
(55) The detecting unit 33-11 sets the B / I information to “I = 00 (access permission state)” (YES in step P14, P6 and P7).
[0106]
(56) The LCD display control unit 33-15 performs control for displaying that the transmission right is released.
(57) The LCD 33-8 displays that the transmission right has been released.
Hereinafter, a procedure in which the mobile station 33 that has made an emergency communication request acquires the transmission right will be described.
[0107]
(58) The operator of the mobile station 33 depresses the press switch 33-9 (timing between steps S40 and S41 in FIG. 4).
(59) The press ON / OFF detector 33-17 detects that the press switch 33-9 has been pressed (YES in step P6).
[0108]
(60) The transmission right acquisition control unit 33-12 creates synchronous burst data in order to acquire the transmission right.
(61) The frame disassembly / assembly control unit 33-4 creates a frame for wireless transmission of the created synchronous burst data.
[0109]
(62) The transmission unit 33-3 transmits the created radio frame to the base station 22 (S41 in the figure).
(63) The transmitting / receiving unit 22-3 receives the synchronous burst data (YES in step Q5).
(64) The transmission right acquisition control unit 22-6 performs transmission / reception of the synchronization burst via the transmission / reception unit 22-3 (steps Q7, S42 and S43).
[0110]
(65) The message transmitting / receiving unit 22-9 transmits the “transmission right acquisition request message” to the line control device 11.
(66) The message transmitting / receiving unit 11-2 receives the “transmission right acquisition request message”.
(67) The transmission right control unit / transmission right granting unit 11-3 sets the transmission right information to “transmission right being granted = 01”.
[0111]
(68) The emergency communication processing unit 11-4 resets the emergency communication presence / absence information to “no emergency communication request = 00”.
(69) The message transmitting / receiving unit 11-2 notifies the base station 22 that the transmission right has been granted by using a “transmission right acquisition response message”.
[0112]
(70) The message transmitting / receiving unit 22-9 receives the “transmission right acquisition response message”.
(71) The control unit 22-7 sets the B / I information to “B (with transmitting station) = 10” (step Q8). As a result, the base station 22 enters a state in which a transmission right is being granted.
(72) The transmission / reception unit 22-3 creates a radio frame in which the B / I bit is set to “B (with transmission station) =“ 11111111 ”.
[0113]
(73) The B (transmitting station present) information is notified to the mobile station 33 (step S44 in FIG. 4).
(74) The receiving units 33-1 and 33-2 receive the radio frame, and the frame disassembly / assembly control unit 33-4 obtains “B (with transmitting station)” information from the B / I bit of the radio frame. To extract.
(75) The detector 33-11 sets the B / I information to “B (with transmitting station) = 10”.
[0114]
(76) The emergency communication request message generation / transmission unit 33-13 sets the emergency communication presence / absence information to “none = 00”.
(77) The LCD display control unit 33-15 performs control to display that the transmission right has been acquired.
(78) The LCD 33-8 displays that the transmission right has been acquired.
[0115]
The operator of the mobile station 33 sees this display, knows that the transmission right has been acquired, and performs emergency communication with the group (step S45 in FIG. 4).
(79) In the line control device 11, the message transmission / reception unit 11-1 notifies the base station 21 by using a “TCH_B / I control message” that the transmission right is granted to another base station.
[0116]
(80) In the base station 21, the message transmitting / receiving unit 21-9 receives the “TCH_B / I control message” (YES in step Q6).
(81) The control unit 21-7 sets the B / I information to “B (no transmission station) = 01” (step Q13).
[0117]
(82) The transmission / reception unit 21-3 creates a radio frame in which the B / I bit is set to “B (no transmission station)”.
(83) Then, the “B (no transmitting station)” information is notified to the mobile station 31 (step S46 in FIG. 4).
[0118]
(84) The receiving units 31-1 and 31-2 receive the radio frame, and the frame disassembly / assembly control unit 33-4 extracts B / I bit “B (no transmitting station)” information.
(85) The detecting unit 31-11 sets the B / I information to “B (no transmitting station) = 01”. As a result, the transmission right of the mobile station 31 has been revoked.
[0119]
(86) The LCD display control unit 31-15 performs control for displaying that another mobile station has acquired the transmission right.
(87) The LCD 31-8 displays that another mobile station has acquired the transmission right.
The operator sees this display and turns off the press switch 31-9 (step S47 in FIG. 4).
[0120]
As a result, the transmission right is transferred from the mobile station 31 to the mobile station 33 in response to an emergency communication request from the mobile station 33.
Note that the operation procedures of steps S08 and S19 to S25 in FIG. 3 until the mobile station 31 acquires the transmission right and performs group communication are executed in the same manner in the embodiments (2) to (13) described later. In the embodiments (2) to (13), description will be omitted, and the operation procedure from the state in which the mobile station 31 has acquired the transmission right and performs group communication will be described.
Example (2)
FIGS. 13 and 14 show the mobile station 31, the base station 21, and the line control device 11 in the embodiment (2) of the present invention, respectively. These mobile station 31, base station 21, and line control device 11 correspond to the mobile station 31, base station 21, and line control device 11 shown in the embodiment (1) of FIG.
[0121]
Although not shown, the mobile stations 32 to 34 and the base station 22 described above have the same configurations as the mobile station 31 and the base station 21, respectively. However, in this embodiment, the mobile stations 32 and 34 are not mentioned.
That is, to summarize this embodiment (2), when the mobile station 31 acquires the transmission right and performs group communication, the mobile station 33 located in a different zone from the mobile station 31 performs emergency communication with the communication CH. The base station 22 notifies this to the mobile station 31 via the line control device 11 and the base station 21, and upon receiving this notification, the mobile station 31 releases the transmission right, and the mobile station 33 transmits. An example of acquiring the right is shown.
[0122]
The specific operation of the embodiment (2) will be described below with reference to the communication phase of FIG. 15 based on FIG. 13 and FIG.
When the mobile station 31 acquires the transmission right and performs group communication, the procedure of steps S50 to S52 in which the mobile station 33 transmits the “emergency communication request message” is the same as that of step S30 in the embodiment (1) of FIG. The procedure is the same as S36.
[0123]
As a result, the mobile station 31 is in a transmission state in steps S20 and P21, the base station 21 is in a state in which transmission rights are being granted in steps Q9 and Q10, and the base station 22 is in an access non-permission state in steps Q20, Q21, and Q22 (b) And the mobile station 33 is in the emergency communication processing (a1) state of step P14.
[0124]
The message transmission / reception unit 11-2 of the line control device 11 receives the “emergency communication request message” from the base station 22 (step S52 in FIG. 15).
The emergency communication processing unit 11-4 sets the emergency communication presence / absence information to “emergency communication request present = 01” and sends a “transmission right release request message” to the message transmission / reception unit 11-1.
[0125]
FIG. 16 (1) shows the format of a “transmission right release request message”, which is composed of a message type and a display type.
FIG. 2B shows display types arbitrarily set by the licensee.
The message transmitting / receiving unit 11-1 transmits a “transmission right release request message” to the base station 21 (step S53 in FIG. 15).
[0126]
The message transmission / reception unit 21-9 receives the “transmission right release request message” (YES in step Q22), and sends this “transmission right release request message = UI (transmission right release request, −, −)” to the transmission / reception unit 21- 2 transmits to the mobile station 31 (step Q24, S54 in the figure).
The receiving unit 31-1 or the receiving unit 31-2 of the mobile station 31 receives the “transmission right release request message”.
[0127]
The frame disassembly / assembly control unit 31-4 extracts the “transmission right release request message”.
The emergency display control unit 31-16 displays that there is an emergency communication request on the LCD 31-8 via the control unit 31-15, and notifies the operator that there is emergency communication (S55 in the figure).
[0128]
When the operator of the mobile station 31 displays that an emergency communication request has been received from another mobile station 33 on the LCD 31-8, when accepting this request, the operator of the mobile station 31 presses the press switch 31-9 to release the transmission right. “Off” is set (YES in step P21, S56 in the figure), and the transmission right release control unit 31-14 releases the transmission right (step P23).
[0129]
The mobile station 31 transmits “transmission right release message = UI (transmission right release, −, −)” to the base station 21 (S57).
The TCH_B / I control unit / transmission station presence / absence control unit 21-7 sets the B / I information to “I (access permission) = 00”.
[0130]
The transmission / reception unit 21-2 creates a radio frame in which the B / I bit is set to “I (access permission) = 00000000”, and sends the radio frame to the mobile station 31 (S59).
The receiving units 31-1 and 31-2 receive the radio frame, and the frame disassembly / assembly control unit 31-4 extracts B / I bit “I (access permission)” information.
[0131]
The TCH_B / I detector / transmitting station presence / absence detector 31-11 sets the B / I information to “I = 00” (NO in step P5).
The LCD display control unit 31-15 performs control for displaying that the transmission right is released, and the LCD 31-8 displays that the transmission right is released.
[0132]
In the base station 21, the message transmitting / receiving unit 21-9 notifies the line control apparatus 11 that the B / I information is set to “I (access permission)”.
In the line control device 11, when it is notified that the message transmission / reception unit 11-1 is set to “I (access permission)”, the transmission right control unit / transmission right granting unit 11-3 transmits the transmission right information “ Set to “Unassigned transmission right”.
[0133]
The message transmitting / receiving unit 11-2 notifies the base station 22 that the B / I information is set to “I (access permission)” (YES in step Q21).
When the message transmission / reception unit 22-9 of the base station 22 is notified that “I (access permission)” is set, the B / I information of the TCH_B / I control unit / transmission station presence / absence control unit 22-7 is obtained. “I (access permission) = 00” is set (step Q23), and the access is permitted in steps Q5 and Q6.
[0134]
The transmitting / receiving unit 22-3 transmits the B / I bit = “I (access permission)” to the mobile station 33 (S59).
The receiving units 33-1 and 33-2 receive the B / I bit = “I”.
The frame disassembly / assembly control unit 33-4 extracts the B / I bit = “I” (YES in step P14). As a result, the mobile station 33 enters the access permission state of steps P6 and P7.
[0135]
The LCD display control unit 33-15 notifies that the transmission right is released (B / I bit = “I”).
The procedure of steps S60 and S61 in which the mobile station 33 acquires the transmission right is the same as steps S42 to S46 in the embodiment (1) of FIG. 4, and in this procedure, the operator of the mobile station 33 selects the press switch. By pressing 33-9, it is possible to acquire a transmission right and perform emergency communication.
Example (3)
FIG. 17 shows the base station 21 and the line control device 11 in the embodiment (3) of the present invention. The base station 21 and the line control device 11 correspond to the mobile station 31, the base station 21, and the line control device 11 shown in the embodiment (1) of FIG. The difference is that the control unit / transmission right granting unit 11-3 has a timer T1. The base station 22 has the same configuration as the base station 21.
[0136]
To summarize this embodiment (3), when the mobile station 31 acquires the transmission right and performs group communication, the mobile station 33 requests emergency communication, and this request is sent to the mobile station 31 according to the embodiment (2). If the mobile station 31 does not release the transmission right in spite of receiving this notification, the transmission right is forcibly released after a predetermined time and the mobile station 33 is given the transmission right. It turns out that.
[0137]
The specific operation of the embodiment (3) will be described below with reference to the communication phase of FIG. 18 based on FIG.
When the mobile station 31 acquires the transmission right and performs group communication, the mobile station 33 requests emergency communication, and after the base station 21 receives the “emergency communication request message”, the mobile station 31 receives the LCD 31-8. The operation procedure of steps S51 to S55 in FIG. 18 until it is displayed that there is an emergency communication is the same as steps S51 to S55 of the embodiment (2) in FIG.
[0138]
In the line control device 11, after the message transmitting / receiving unit 11-1 transmits the “transmission right release request message” (step S53 in FIG. 18), the transmission right control unit / transmission right granting unit 11-3 The timer T1 is started (step Q41: see below, S70 in the figure).
Note that the timer T1 may be arranged in the base station 21 instead of the line control device 11, and notify the line control device 11 of the timeout. Steps Q40 to Q44 in FIG. 9 show a procedure when the timer T1 is arranged in the base station 21. The above-described step Q41 and the following step Q43 of the line control apparatus 11 are operations corresponding to steps Q41 and Q43 in FIG.
[0139]
First, when “Emergency communication is present” is displayed on the LCD 31-8, and the operator of the mobile station 31 turns off the press switch to release the transmission right before the timer T1 times out (S75). The same execution as steps S57 to S61 in the embodiment (2) of FIG. 15 is performed, and the mobile station 33 can acquire the transmission right and perform emergency communication.
[0140]
Next, a case where the transmission right is not released by the operator of the mobile station 31 before the transmission right release timer T1 times out will be described.
When time-out occurs (step Q43, step S71 in FIG. 18), the message transmitting / receiving units 11-1 and 11-2 respectively transmit a message for releasing the transmission right to the base stations 21 and 22 (S72 in FIG. 18). The transmission right information of the transmission right control unit / transmission right granting unit 11-3 is set to “transmission right not being granted”.
[0141]
Thereafter, the procedure of steps S73 to S76 in which the mobile station 33 by the emergency communication acquires the transmission right performs the same operation as that of steps S38 to S46 in the embodiment (1) of FIG. 4, and the mobile station 33 acquires the transmission right. .
Example (Four)
FIG. 19 shows the mobile station 32 in the embodiment (4) of the present invention. This mobile station 32 is different from the mobile station 31 shown in the embodiment (1) of FIG. 1 in that a control CH switching request unit 32-19 and a control CH communication determination unit 32-25 are added.
[0142]
The mobile stations 31, 33 and 34 have the same configuration as the mobile station 32, and the base stations 21 and 22 and the line control device 11 have the same configuration as in the embodiment (1).
To summarize this embodiment (4), when the mobile station 31 located in the service zone 21a of the base station 21 acquires the transmission right and performs group communication, the mobile station 32 located in the same zone 21a An emergency communication request is transmitted via the control CH to acquire a transmission right.
[0143]
The specific operation of the embodiment (4) will be described below with reference to the communication phase in FIG.
The state of the base station 21, the mobile station 31, and the mobile station 32 in step S24 of FIG. 20 in which the mobile station 31 has acquired the transmission right and performs group communication is the state in which the transmission right is granted in steps Q9 and Q10, The transmission state of steps P20 and P21 and the access non-permission state of steps P8 and P9.
[0144]
The operator of the mobile station 32 presses the emergency communication switch 32-10 when the need for emergency communication occurs (step S80 in FIG. 20).
The emergency communication request detection unit 32-18 detects that the emergency communication switch 32-10 has been pressed (YES in Step P9).
[0145]
The emergency communication request message generating / transmitting unit 32-13 sets the emergency communication presence / absence information to “emergency communication requested” and generates an “emergency communication request message”.
The frame disassembly / assembly control unit 33-4 creates a radio frame of “emergency communication request message”.
[0146]
Since the control CH switching request unit 32-24 is B / I information = “B (with transmitting station)” (step P10), the control CH switching request unit 32-24 switches to the uplink control CH in the zone 21a of the base station 21 and establishes synchronization (step S10). 30 and P31, S81). The control CH communication determination unit 32-25 checks whether or not control CH communication is being performed in the zone 21a of the base station 21 (step P32).
[0147]
Then, when the control CH communication is not performed, the transmission unit 32-3 transmits an “emergency communication request message” (step P33, S82 in FIG. 11).
The operations of steps S83 to S85 in FIG. 4 are the same as steps S35 to S39 between the base station 21 and the mobile station 32 and between the base station 22 and the mobile station 33 in the embodiment (1) of FIG. It is the same as that between 33 and between the base station 21 and the mobile station 32.
[0148]
When the mobile station 32 receives the B / I bit of the downlink radio frame = “I (accessible state)” (step P34), the mobile station 32 switches the frequency to the communication channel (step P35, step S86 in FIG. 20), and the synchronization burst. Is established, synchronization is established, and a transmission right is acquired (step P36, S88). After acquiring the transmission right, emergency communication is performed with respect to the group.
Example (Five)
The mobile stations 31 to 34 in this embodiment (5) have the same configuration as the mobile station 32 shown in FIG. 19, and the base stations 21 and 22 and the line control device 11 are the same as those in the embodiment (2 ).
[0149]
To summarize this embodiment (5), the above embodiments (2) and (4) are combined, and the mobile station 31 located in the service zone 21a of the base station 21 acquires the transmission right. When performing group communication, the mobile station 32 residing in the same service zone 21a requests emergency communication via the control CH, and the operator of the mobile station 31 releases the transmission right so that the mobile station 32 The transmission right is acquired.
[0150]
That is, steps S80 to S83 of the communication phase in FIG. 21 are performed when the mobile station 31 acquires the transmission right and performs group communication, the operator of the mobile station 32 presses the emergency communication switch 33-10, The operation of transmitting the “emergency communication request message” to the base station 21 and the line control device 11 via the control CH is shown. This operation is the same as steps S80 to S83 in the embodiment (4) of FIG.
[0151]
In steps S90 to S96 in the figure, the line control device 11 receives the “transmission right release request message” and causes the mobile station 31 to display “emergency communication present”. As a result, the operator of the mobile station 31 releases the transmission right, and the mobile stations 31 to 34 are notified of the B / I bit = “I (accessible state)”. This is the same operation as steps S53 to S59 of the embodiment (2).
[0152]
The mobile station 32 acquires the transmission right and performs emergency communication with the group in the same procedure as steps S86, S88, and S89 in the embodiment (4) (S97 and S98 in the figure).
Example (6)
The mobile stations 31 to 34 in this embodiment (6) have the same configuration as the mobile station 32 of the embodiment (4) shown in FIG. 19, and the base stations 21 and 22 and the line control device 11 are shown in FIG. The configuration is the same as in Example (3).
[0153]
To summarize this embodiment (6), it is a combination of the embodiment (3) and the embodiment (5), and the mobile station 31 located in the service zone 21a of the base station 21 obtains the transmission right to obtain the group. When communicating, the mobile station 32 residing in the same service zone 21a requests emergency communication, but if the mobile station 31 does not release the transmission right, the mobile station 31 forcibly releases the transmission right after a certain time and moves It is given to the station 32.
[0154]
That is, in steps S80 to S83 and S90 to S92 in FIG. 22, when the mobile station 31 acquires the transmission right and performs group communication, the mobile station 32 makes an emergency communication request, and this request is displayed on the mobile station 31. The operation until it is done is shown. This operation is the same as steps S80 to S83 and S90 to S92 in the embodiment (5) of FIG.
[0155]
The circuit control device 11 starts the timer T1 after step S90 which has transmitted the “transmission right release request message” (step S100 in FIG. 22).
The operation when the operator of the mobile station 31 receives the notification of “emergency communication present” and releases the transmission right is the same as steps S93 to S98 in the embodiment (5) of FIG.
[0156]
If the operator of the mobile station 31 does not release the transmission right in spite of the display of “emergency communication present”, the timer T1 times out after a certain time (step S101 in FIG. 22).
The line control device 11 notifies the base stations 21 and 22 of the timeout (S102).
In subsequent steps S103, S105, and S106, the mobile station 32 acquires the transmission right and performs emergency communication. This procedure is the same as steps S96 to S98 in the embodiment (5).
Example (7)
FIG. 23 shows the mobile station 32 of the embodiment (7). The mobile station 32 is different from the mobile station 32 of the embodiment (6) shown in FIG. 19 in that the adjacent zone level determination unit 32-26 Is added. Note that the mobile stations 31, 33, and 34 have the same configuration as the mobile station 32.
[0157]
In this embodiment (7), a base station 23 is added in addition to the base stations 21 and 22 (see FIG. 43). The base stations 21 to 23 and the line control device 11 have the same configurations as the base station 21 and the line control device 11 of the embodiment (1) shown in FIG.
To summarize this embodiment (7), when the mobile station 31 located in the service zone 21a of the base station 21 acquires the transmission right and performs group communication, the mobile station 31 is in the same service zone 21a that is using the control CH. For example, the mobile station 32 that is in the area requests emergency communication via the control CH of the service zone 23a of the adjacent base station 23 and acquires the transmission right.
[0158]
The specific operation of the embodiment (7) will be described below with reference to the communication phase of FIG.
When the mobile station 31 has acquired the transmission right and is performing group communication, the operator of the mobile station 32 in need of emergency communication presses the emergency communication switch 32-10 (step S80 in FIG. 24).
[0159]
The emergency communication request detection unit 32-18 detects that the emergency communication switch 32-10 has been pressed (YES in Step P9).
The message generation / transmission unit 32-13 sets the emergency communication presence / absence information to “emergency communication requested” and generates an “emergency communication request message”.
[0160]
The frame disassembly / assembly control unit 32-4 creates a frame for wirelessly transmitting the “emergency communication request message”.
The control CH switching request unit 32-24 checks the B / I bit of the downlink call CH, and if the B / I bit = “B (with transmitting station)”, the control CH switching request unit 32-24 sets the control CH of the zone 21a of the base station 21. The frequency is switched (NO and P30 in step P10, S81 in the figure).
[0161]
After establishing synchronization with the switched control CH, the control CH communication determination unit 32-25 determines whether control CH communication is being performed in the zone 21a of the base station 21, and the control channel communication information of the physical channel for downlink control A check is made with reference to the CI (steps P31 and P32, S110 in the figure).
[0162]
FIG. 25 (1) shows the format of the uplink control physical channel. The first unit of the uplink control channel is the linearizer preamble LP, the burst transient response guard time R, the preamble P, the control signal CAC, and the synchronization. It is composed of a word SW, an idle bit I, a color code CC, a control signal CAC, and a guard time G. Also, the second and subsequent units of the uplink control channel have the same configuration as the first unit, except for the number of bits.
[0163]
Fig. 2 (2) shows the format of the downlink control physical channel. The difference between this channel configuration and the uplink channel is that there is no linearizer preamble LP and guard time G, and control instead of the idle bit I. Channel communication information CI is added, and the number of bits of the rear control signal CAC is different.
[0164]
FIG. 3 (3) shows the set value of the control channel communication information CI, and “00” and “01” are assigned to “non-control channel communication” and “control channel communication”, respectively. .
When the control channel communication information CI = “01 (during control CH communication)”, the control CH switching request unit 32-24 switches to, for example, the frequency of the downlink control CH in the service zone 23a of the adjacent base station 23 (step P32). YES and P40, step S111 in FIG. 24).
[0165]
After establishing synchronization with the switched control CH (step P43), the control CH communication determination unit 32-25 determines whether control CH communication is being performed in the zone 23a of the base station 23 (step P44, FIG. S112), the adjacent zone level determination unit 32-26 measures the reception level L1 of the downlink control CH of the zone 23a of the base station 23 (step P41, S113 in the figure). It is determined whether or not the “adjacent zone selection level” notified by the “message” is equal to or higher (step P42, S114 in the figure).
[0166]
The steps S111 to S114 in FIG. 24 and steps P41 to P44 in FIG. 7 are different in operating procedure, but any procedure may be used.
FIG. 26 (1) shows the format of the “radio channel designation message”. The information elements of this message are message type, frequency code, slot number, scramble code, mobile station transmission power designation, channel information, and adjacent information. Zone connection level.
[0167]
FIG. 2B shows the configuration of the adjacent zone connection level, which is composed of a 1-bit spare bit and a 7-bit adjacent zone connection level that is a reception level for selecting an adjacent zone. As the bit value at this level, the set value shown in FIG.
[0168]
For example, if the reception level L1 of the downlink control CH of the base station 23 is equal to or higher than the notified adjacent zone connection level, the emergency communication request message transmission unit 32-3 transmits the “emergency communication request message via the switched control CH. Is transmitted to the base station 23 (step P45, step S115 in FIG. 24).
[0169]
If the reception level L1 is equal to or lower than the notified adjacent zone connection level, the control CH switching request unit 32-24 searches for the control CH of the base station whose downlink control CH reception level L1 is equal to or higher than the adjacent zone connection level. Switch to control CH.
The base station 23 receives the “emergency communication request message”, transmits the “emergency communication request response message” to the mobile station 32, and confirms that the “emergency communication request message” is received from the line control device 11. Notification is made (S116 in the figure).
[0170]
The mobile station 32 receives the “emergency communication request response message”, and establishes synchronization by switching to the call CH of the base station 21 (steps P46 to P48).
When notified from the base station 23 that the “emergency communication request message” has been received, the line control device 11 transmits a “transmission right deprivation request message” to the base station 21 in which the transmission station 31 exists ( Step Q10 YES, S118).
[0171]
The base station 21 receives the “transmission right deprivation request message” (YES in step Q10), and sets the B / I bit of the downlink call CH to “I (access) to deprive the mobile station 31 of the transmission right. Set to “permitted” ”and transmitted to the mobile stations 31 and 32 (step Q12, S119).
Further, the line control device 11 instructs the base station 22 to change the B / I information from “B (no transmitting station)” to “I (access permitted)” (S120).
[0172]
The base station 22 sets the B / I bit of the downlink call CH to “I (access permission)” and notifies the mobile stations 33 and 34 (S121).
When the mobile station 32 receives the B / I bit of the downlink call CH = “I (access granted)” (YES in step P49), the mobile station 32 sends and receives a synchronous burst to acquire a transmission right, and Communication is performed (transmission state of steps P20 and P21, S123).
Example (8)
The mobile stations 31 to 34 in the embodiment (8) have the same configuration as the mobile station 32 shown in FIG. 23, and the base stations 21 to 23 and the line control device 11 are the same as those in the embodiment (2) shown in FIG. Have the same configuration.
[0173]
To summarize this embodiment (8), the above embodiment (5) and embodiment (7) are combined, and the mobile station 31 located in the service zone 21a of the base station 21 acquires the transmission right. Mobile station 32 residing in the same service zone 21a requests emergency communication via the control channel of service zone 23a of adjacent base station 23, and the operator of mobile station 31 The mobile station 32 acquires the transmission right by releasing the transmission right.
[0174]
That is, steps S80, S81, and S110 to S117 in the communication phase of FIG. 27 are performed when the mobile station 31 acquires the transmission right and performs group communication, and the mobile station 32 presses the emergency communication switch 32-10. The operation until the “emergency communication request message” is transmitted to the base station 23 and the frequency is switched to the call CH of the base station 21 is shown. This operation is the same as the steps S80, S81, and S110 to S117 in the embodiment (7) shown in FIG.
[0175]
In addition, after the base station 21 receives the transmission right release request from the line control device 11, the mobile station 31 releases the transmission right with the display of “emergency communication present” and the mobile station 32 acquires the transmission right. The procedures of S130 to S137 are the same as steps S90 to S96 and S98 of the embodiment (5) shown in FIG.
Example (9)
The mobile stations 31 to 34 in this embodiment (9) have the same configuration as the mobile station 32 of the embodiment (7) shown in FIG. 23, and the base stations 21 to 23 and the line control device 11 are shown in FIG. The configuration is the same as in Example (3).
[0176]
To summarize this embodiment (9), the above embodiment (6) and embodiment (8) are combined, and the mobile station 31 located in the service zone 21a of the base station 21 acquires the transmission right. Mobile station 32 located in the same service zone 21a when requesting emergency communication via the control channel of the service zone 23a of the adjacent base station 23. When 31 does not release the transmission right, the timer T1 is started, and after a predetermined time has elapsed, the transmission right is forcibly released, and the mobile station 32 acquires the transmission right.
[0177]
That is, steps S80, S81, S110 to S117, and S130 to S132 in FIG. 28 are performed when the mobile station 31 obtains a transmission right and makes a call, and the mobile station 32 performs emergency communication with the control channel of the base station 23. The operation is shown until the frequency is switched to the call CH of the base station 21 and “Emergency communication present” is displayed on the mobile station 31. This operation is the same as steps S80, S81, S110 to S117, and S130 to S132 in the embodiment (8) of FIG.
[0178]
After step S130 in FIG. 28, line controller 11 starts timer T1 (step S140 in FIG. 28).
Steps S140 to S144 show a procedure from when the timer T1 times out until the transmission right of the mobile station 31 is forcibly released and the mobile station 32 acquires the transmission right. This procedure is the same as S100 to S103 and S106 in the embodiment (6) of FIG.
[0179]
However, in the embodiment (9), the position of the frequency switching step S117 is different from the switching step S105 of the embodiment (6), but the switching may be performed at any position.
Example (Ten)
FIG. 29 shows the mobile station 31 in the present embodiment (10). The difference between the mobile station 31 and the mobile station 31 shown in FIG. 1 is that the control unit 31-19 has a TCH switching request unit 31-27. Is added. The mobile stations 32-34 of the present embodiment (10) also have the same configuration as the mobile station 31, and the base stations 21-23 and the line control device 11 have the same configuration as the embodiment (1) shown in FIG. .
[0180]
To summarize this embodiment (10), when the mobile station 31 located in the service zone 21a of the base station 21 acquires the transmission right and performs group communication, the mobile station 32 located in the same service zone 21a. However, an emergency communication is requested via a call CH that is not used by the mobile station 31, the transmission right of the mobile station 31 is forcibly released, and the mobile station 32 acquires the transmission right.
[0181]
The specific operation of the embodiment (10) will be described below with reference to the communication phase of FIG.
The operation when the mobile station 32 needs emergency communication when the mobile station 31 acquires the transmission right and performs group communication will be described below.
[0182]
The operator of the mobile station 32 presses the emergency communication switch 32-10 (step S80 in FIG. 30).
The emergency communication request detection unit 32-18 detects that the emergency communication switch 32-10 has been pressed (YES in Step P9).
[0183]
The message generation / transmission unit 32-13 sets the emergency communication presence / absence information to “emergency communication requested” and generates an “emergency communication request message”.
The frame disassembly / assembly control unit 32-4 creates a radio frame of the “emergency communication request message”.
[0184]
The communication CH switching request unit 32-27 establishes synchronization by switching to the frequency of the control CH of the zone 21a of the base station 21 when B / I information = “B (with transmitting station)” (YES in P10) (step S21). P30 and P31, S81 in FIG. The control CH communication determination unit 32-25 checks whether control CH communication is being performed in the zone 21a of the base station 21 with reference to the control channel communication information CI (see FIG. 25 (3)).
[0185]
When control CH communication is being performed (YES in step P32, step S110 in FIG. 30), the communication CH switch request unit 32-27 switches to another call CH in the base station 21 and establishes synchronization (steps S50 and S110). P51, S111).
When the B / I bit of the call CH is “I” or B (no transmitting station) ”(YES in step P52, S150 in FIG. 12), a synchronous burst is exchanged (S151 in FIG. 12), and FIG. The “emergency communication request message” is transmitted to the base station 21 in the format (step P53).
[0186]
The base station 21 transmits an “emergency communication request response message” to the mobile station 32 (step P54) and notifies the line control device 11 that the “emergency communication request message” has been received (S152 in FIG. 5).
The mobile station 32 switches the frequency to the call CH (step P56, S153 in the figure).
[0187]
The line control device 11 transmits a “transmission right deprivation request message” to the base station 21 in which the transmitting station (mobile station 31) exists (S154 in the figure).
In order to deprive the mobile station 31 of the transmission right, the base station 21 sets the B / I bit of the downlink call CH to “I (access permission)” and transmits it to the mobile station 32 (S155 in the figure). .
[0188]
The mobile station 32 exchanges synchronization bursts to acquire the transmission right, and performs emergency communication with the group (steps P57 YES, transmission states of P20 and P21, S158 in the figure).
Further, the line control device 11 instructs the base station 22 to change the B / I bit of the downlink call CH from “B (no transmitting station)” to “I (access permitted)” (step Q12). ).
[0189]
The base station 22 sets the B / I bit of the downlink call CH to “I (access permission)” and notifies the mobile stations 33 and 34 (S156 in the figure).
Example (11)
The mobile stations 31 to 34 in the embodiment (11) have the same configuration as the mobile station 32 shown in FIG. 29, and the base stations 21 to 23 and the line control device 11 are the same as those in the embodiment (2) shown in FIG. Have the same configuration.
[0190]
To summarize this embodiment (11), the above embodiment (8) and embodiment (10) are combined, and the mobile station 31 located in the service zone 21a of the base station 21 acquires the transmission right. Mobile station 32 located in the same service zone 21a notifies the mobile station 31 of a request for emergency communication via a call CH different from the call CH used by the mobile station 31. . When the operator of the mobile station 31 releases the transmission right, the mobile station 32 acquires the transmission right.
[0191]
First, when the mobile station 31 acquires the transmission right and performs group communication, the mobile station 32 presses the emergency communication switch 32-10 and sends an “emergency communication request message” to the base station 21 via another call CH. Operation steps (steps S80, S81, S110, S111, S150 to S153 in FIG. 31) until the frequency is switched to the original call CH are the same as step S80 in the embodiment (10) shown in FIG. The procedure is the same as S81, S110, S111, and S150 to S153.
[0192]
Also, the base station 21 receives the “transmission right release request message”, notifies the mobile station 31 that there is emergency communication, recognizes this, and the operator of the mobile station 31 releases the transmission right, and the mobile station 31 The procedure of steps S154, S155, S160 to S165 until 32 acquires the transmission right is the same as steps S130 to S137 of the embodiment (8) shown in FIG.
Example (12)
The mobile stations 31 to 34 in the embodiment (12) have the same configuration as the mobile station 32 shown in FIG. 29, and the base stations 21 to 23 and the line control device 11 are the same as those in the embodiment (3) shown in FIG. Have the same configuration.
[0193]
To summarize this embodiment (12), the embodiment (9) and the embodiment (10) are combined, and the mobile station 31 located in the service zone 21a of the base station 21 acquires the transmission right. Mobile station 32 located in the same service zone 21a notifies the mobile station 31 of a request for emergency communication via a call CH different from the call CH used by the mobile station 31. . If the operator of the mobile station 31 does not release the transmission right in spite of this notification, the transmission right of the mobile station 31 is revoked after a predetermined time has elapsed, and the mobile station 32 grants the transmission right.
[0194]
Steps S80, S81, S110, S111, and S150 to S153 in FIG. 32 are performed when the mobile station 31 acquires the transmission right and performs group communication, and the mobile station 32 depresses the emergency communication switch 32-10. FIG. 30 shows an operation procedure after transmitting an “emergency communication request message” to the station 23 via another call CH and switching to the original call CH. This is the embodiment (10) shown in FIG. Steps S80, S81, S110, S111, and S150 to S153 are the same as those in the steps.
[0195]
In addition, although the base station 21 receives the “transmission right release request message” and notifies the mobile station 31 that there is an emergency communication, the operator of the mobile station 31 does not release the transmission right and does not release the transmission right for a predetermined time. After the elapse of time, steps S154 to S155, S160, and S170 to S174 until the mobile station 32 obtains the transmission right are the steps S130 to S132 and S140 to S144 of the embodiment (9) shown in FIG. It is the same.
Example (13)
FIG. 33 shows the mobile station 31 in this embodiment (13). The mobile station 31 is different from the mobile station 31 shown in FIG. 1 in that the transmission right acquisition control unit 31-12 includes a transmission stop detection unit. That is, 31-28 is added and a reservation display control unit 31-29 is added. Further, the other mobile stations 32 to 34 have the same configuration as the mobile station 31.
[0196]
FIG. 34 shows the base stations 21 and 22 and the line control device 11, and has the same configuration as the embodiment (1) shown in FIG.
To summarize this embodiment (13), when the mobile station 31 located in the service zone 21a of the base station 21 acquires the transmission right and performs group communication, the mobile station 31 is located in the service zone 22a of the base station 22. The mobile station 33 requests emergency communication. At this time, “transmission right reserved” is displayed on the mobile station 33, and “press prohibited” is displayed on the other mobile stations 31, 32, and the like.
[0197]
Further, when the mobile station 32 other than the mobile station 33 that has requested emergency communication, for example, requests further emergency communication, the line control device 11 prohibits this.
The specific operation of the embodiment (13) will be described below with reference to the communication phases (No. 1) and (No. 2) of FIGS.
[0198]
The base station 21 and the mobile stations 31 and 32 when the mobile station 31 acquires the transmission right and performs group communication are in the state of steps S23 and S24 of the communication phase of FIG. The stations 33 and 34 are in the state of step S25.
The operation after the emergency communication is required for the mobile station 33 will be described below.
[0199]
The operator of the mobile station 33 depresses the emergency communication switch 33-10 (YES in step P9, step S30 in the figure).
Thereafter, operations similar to steps S31 to S35 in the embodiment (1) shown in FIG. 4 are performed, and an “emergency communication request message” is sent to the base station 22 (YES in steps P10, P11 and P12).
[0200]
The transmitting / receiving unit 22-3 receives the “emergency communication request message” (step Q29, step S35 in FIG. 35).
The message control unit 22-8 detects that the “emergency communication request message” has been received.
[0201]
The message transmitting / receiving unit 22-9 transmits an “emergency communication request response message” to the mobile station 33 (steps Q29 and P13), and notifies the line control device 11 that the “emergency communication request message” has been received ( Step Q30, S36 in FIG.
The message transmission / reception unit 11-2 receives the “emergency communication request message”.
[0202]
The emergency communication processing unit 11-4 sets the emergency communication presence / absence information to “emergency communication requested = 01”.
The message transmitting / receiving unit 11-1 transmits a “transmission right deprivation request message” for releasing the transmission right to the base station 21 in which the transmission station (mobile station 21) exists.
[0203]
The message transmitting / receiving unit 21-9 receives the “transmission right deprivation request message” (YES in step Q17).
The TCH_B / I control unit / transmitting station presence / absence control unit 21-7 sets the B / I information of the call CH to “I (transmission right reserved)” (step Q12).
[0204]
The transmission / reception unit 21-2 creates a radio frame in which the B / I bit is set to “I (reserving transmission right)”, and transmits the radio frame to the mobile stations 31 and 32 (S180).
The receiving units 31-1 and 31-2 receive the radio frame, and the frame disassembly / assembly control unit 31-4 extracts “I (transmission right reserved)” information of the B / I bit.
[0205]
The TCH_B / I detection unit / transmission station presence / absence detection unit 31-11 sets the B / I information to “I (transmission right reserved)”.
The LCD display control unit 31-15 and the reservation display control unit 31-29 perform control for displaying that the transmission right is released and that the transmission right is reserved, respectively.
[0206]
The LCD 31-8 displays “Press prohibited” indicating that the transmission right has been released and that the transmission right is being reserved (S181).
Further, the reservation display control unit 31-29 does not perform the transmission right acquisition process even if the press switch is turned on, and prohibits the transmission right acquisition request.
[0207]
Further, the line control apparatus 11 instructs the base station 22 to change the B / I bit of the downlink call CH from “B (no transmission station)” to “I (transmission right reserved)” ( Step Q17 YES, S182).
The base station 22 sets the B / I bit of the downlink call CH to “I (transmission right reserved)” and notifies the mobile station 33 (YES in Step P15, Step Q50, S183).
[0208]
The mobile station 33 displays that the transmission right is being reserved (S184), transmits / receives a synchronization burst to acquire the transmission right, and performs emergency communication with the group (transmission status of steps P20 and P21, S185). ).
In step 190 in FIG. 36, for example, a mobile station 34 other than the mobile station 33 that transmitted the “emergency communication request message” makes a transmission right acquisition request to the line control device 11 via the base station 22 (step S191 in FIG. 36). The line control device 11 transmits “transmission stop request message = UI (transmission stop, −, −)” to the mobile station 34 that has requested transmission right acquisition via the base station 22 (S192). ).
[0209]
FIG. 37 shows a format of a “transmission stop request message”, and this “transmission stop request message” is composed of only one octet message type.
The mobile station 34 that has received this “transmission stop request message” interrupts the transmission right acquisition process and shifts to a reception (transmission prohibited) state.
[0210]
For example, the timer T2 is arranged in the base station 22 (or the line control device 11), and when the emergency communication request is generated and the transmission right reservation is set, the timer T2 is started (steps Q50 and Q51 in FIG. 10), and a timeout occurs. To set B / I information = “I (access granted)” (YES and Q55 in step Q54), cancel the status of I “Reserving transmission right” and “Press prohibited” and set mobile stations 31 to 34 ( You may make it accessible state of step Q5 and Q6 which can make an emergency communication request to (including the mobile station 33).
[0211]
Further, the present embodiment (13) is applied to the embodiment (1), but can be similarly applied to the embodiments (2) to (12).
FIGS. 33 and 38 to 40 show Examples (2) and (3), Examples (4) to (6), Examples (7) to (9), and Examples (10) to (13), respectively. FIGS. 34, 41 and 42 show embodiments (4), (7) and (10), embodiments (2), (5), (8) and (11), respectively. In addition, a line control device and a base station when applied to the embodiments (3), (6), (9) and (12) are shown.
[0212]
【The invention's effect】
As described above, according to the group communication apparatus of the present invention, each base station determines whether the transmitting station is in the same radio zone and preferably whether the access is in the radio zone of the own station. The mobile station determines the channel for issuing an emergency communication request based on the notification, and forcibly releases the transmission right of the transmitting station when the line control device detects the emergency communication request. If the transmitter does not release the transmission right despite the notification, the transmission right is forcibly released after a predetermined time. Thus, when a mobile station to which a transmission right is given is in a call, other mobile stations can perform emergency communication, and a highly reliable group communication apparatus can be constructed.
[0213]
In addition, the mobile station that issued the emergency communication request is notified that the transmission right has been released, and this notification is displayed on the display unit, or the emergency communication request is issued for a certain period of time after the transmission right is released. Since the transmission right is not granted to mobile stations other than the mobile station that performed the mobile station, the mobile station that has made the emergency communication request can reliably acquire the transmission right.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment (1) of a group communication apparatus according to the present invention.
FIG. 2 is a table showing a correspondence relationship between used channels and transmission right release methods in the embodiments (1) to (12) of the group communication apparatus according to the present invention.
FIG. 3 is a diagram showing a communication phase example (part 1) in the embodiment (1).
FIG. 4 is a diagram showing a communication phase example (2) in the embodiment (1).
FIG. 5 is a flowchart (part 1) illustrating an operation example of a mobile station in the group communication apparatus according to the present invention.
FIG. 6 is a flowchart (part 2) illustrating an operation example of a mobile station in the group communication apparatus according to the present invention.
FIG. 7 is a flowchart (part 3) showing an operation example of the mobile station in the group communication apparatus according to the present invention.
FIG. 8 is a flowchart (part 1) showing an operation example of a base station in the group communication apparatus according to the present invention.
FIG. 9 is a flowchart (part 2) illustrating an operation example of the base station in the group communication apparatus according to the present invention.
FIG. 10 is a flowchart (part 3) showing an operation example of the base station in the group communication apparatus according to the present invention.
FIG. 11 is a diagram showing set values of information used in the group communication apparatus according to the present invention.
FIG. 12 is a diagram showing a format of an emergency communication request message and a response message in the group communication device according to the present invention.
FIG. 13 is a block diagram showing a configuration example of a mobile station in the embodiments (2) and (3) of the group communication apparatus according to the present invention.
FIG. 14 is a block diagram showing a line control device and a base station in the embodiments (2), (5), (8), and (11) of the group communication device according to the present invention.
FIG. 15 is a sequence diagram showing an example of a communication phase in the embodiment (2).
FIG. 16 shows a transmission right release request message in the group communication apparatus according to the present invention.
FIG. 17 is a block diagram showing a line control device and a base station in the embodiments (3), (6), (9), and (12) of the group communication device according to the present invention.
FIG. 18 is a sequence diagram showing an example of a communication phase in the embodiment (3).
FIG. 19 is a block diagram showing a configuration example of a mobile station in the embodiments (4) to (6) of the group communication apparatus according to the present invention.
FIG. 20 is a sequence diagram illustrating an example of a communication phase in the embodiment (4).
FIG. 21 is a sequence diagram showing an example of a communication phase in the embodiment (5).
FIG. 22 is a sequence diagram showing an example of a communication phase in the embodiment (6).
FIG. 23 is a block diagram showing a configuration example of a mobile station in the embodiments (7) to (9) of the group communication apparatus according to the present invention.
FIG. 24 is a sequence diagram showing an example of a communication phase in the embodiment (7).
FIG. 25 is a diagram showing a format of a general control physical channel.
FIG. 26 is a diagram showing an example of a radio channel designation message in the group communication apparatus according to the present invention.
FIG. 27 is a sequence diagram showing an example of a communication phase in the embodiment (8).
FIG. 28 is a sequence diagram showing an example of a communication phase in the embodiment (9).
FIG. 29 is a block diagram showing a configuration example of a mobile station in the embodiments (10) to (12) of the group communication apparatus according to the present invention.
FIG. 30 is a sequence diagram showing an example of a communication phase in the embodiment (10).
FIG. 31 is a sequence diagram showing a communication phase example in the embodiment (11).
FIG. 32 is a sequence diagram showing an example of a communication phase in the embodiment (12).
FIG. 33 is a block diagram (No. 1) showing a configuration example of a mobile station in the embodiment (13).
FIG. 34 is a block diagram (part 1) illustrating the line control device and the base station in the embodiment (13).
FIG. 35 is a sequence diagram showing a communication phase example (part 1) in the embodiment (13).
FIG. 36 is a sequence diagram showing a communication phase example (2) in the embodiment (13).
FIG. 37 shows a transmission stop request message in the group communication apparatus according to the present invention.
FIG. 38 is a block diagram (No. 2) showing a configuration example of a mobile station in the embodiment (13).
FIG. 39 is a block diagram (No. 3) showing a configuration example of a mobile station in the embodiment (13).
FIG. 40 is a block diagram (No. 4) illustrating a configuration example of a mobile station in the embodiment (13).
FIG. 41 is a block diagram (part 2) illustrating the line control device and the base station in the embodiment (13).
FIG. 42 is a block diagram (part 3) illustrating the line control device and the base station in the embodiment (13).
FIG. 43 is a block diagram showing a configuration example of a general group communication apparatus system.
FIG. 44 is a sequence diagram showing an example of group communication phases in a conventional group communication apparatus.
FIG. 45 is a diagram showing a format of a synchronous burst signal in the group communication apparatus.
FIG. 46 is a diagram showing a format of a physical channel signal for communication in the group communication apparatus.
[Explanation of symbols]
10 Group communication equipment
11 to 1n line controller
21, 22, 22, ..., 2n base station
21a, 22a, 23a, ..., 2na Service zone (wireless zone)
31, 32, 33, 34, ..., 3i ..., 3n mobile stations
11-1, 11-2 Message sending / receiving part
11-3 Transmission Right Control Unit / Transmission Right Granting Unit
11-4 Emergency Communication Processing Department
21-1 ~ 4, 22-1 ~ 4 Transceiver
21-5, 22-5 Common control unit
21-6, 22-6 Transmission Right Acquisition Control Unit
21-7, 22-7 TCH_B / I controller / transmitter presence / absence controller
21-8, 22-8 Message control section
21-9, 22-9 Message sending / receiving part
21-10, 22-10 Duplexer
21-11, 22-11 Transmitting antenna
21-12, 22-12 Receiving antenna
31-1 to 3, 33-1 to 3 Receiver
31-4, 33-4 Frame disassembly / assembly control section
31-5, 33-5 Audio interface
31-6, 33-6 RECV
31-7, 33-7 MIC
31-8, 33-8 LCD
31-9, 33-9 Press switch
31-10, 33-10 Emergency communication switch
31-11, 33-11 TCH_B / I detector / transmitter presence detector
31-12, 33-12 Transmission Right Acquisition Control Unit
31-13, 33-13 Emergency communication request message generator / transmitter
31-14, 33-14 Transmission Right Release Control Unit
31-15, 33-15 LCD display controller
31-16, 33-16 Emergency display controller
31-17, 33-17 Press ON / OFF detector
31-18, 33-18 Emergency communication request detector
31-19 Controller
31-20, 33-20 Power amplifier
31-21, 33-21 Duplexer
31-22, 33-22 Receiving antenna
31-23, 33-23 Transmitting and receiving antennas
32-24 Control CH switching request section
32-25 Control CH Communication Judgment Unit
32-26 Adjacent zone level judgment part
32-27 Communication CH switching request section
31-28 Transmission stop detector
31-29 Reserved display control section
T1, T2 timer
In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (13)

In a group communication device comprising a line control device for controlling a plurality of radio zones composed of base stations and mobile stations and managing group communication,
Each base station notifies the mobile station located in its own radio zone whether or not a transmission station that is a mobile station to which a transmission right is granted is located in the same radio zone,
When the mobile station is in a radio zone different from the radio zone of the transmitting station, the mobile station issues an emergency communication request via a telephone line,
The line control device forcibly releases the transmission right of the transmitting station when detecting the emergency communication request. In claim 1,
The line control apparatus, comprising: means for notifying the transmitting station that the emergency communication request has been made, instead of forcibly releasing the transmission right. In claim 2,
The line control apparatus includes a timer for forcibly releasing the transmission station when the transmission station does not release the transmission right for a predetermined time or more. In any one of Claims 1 thru | or 3,
The group communication apparatus, wherein the mobile station is located in the same wireless zone as the transmitting station and issues the emergency communication request via a control line of the located wireless zone. In claim 4,
The group communication apparatus, wherein the mobile station issues the emergency communication request via a control line of a wireless zone adjacent to the existing wireless zone instead of the control line. In claim 4,
The group communication apparatus, wherein the mobile station issues the emergency communication request via a call line different from the call line used by the transmitting station instead of the control line. In any one of Claims 1 thru | or 6.
The line control device has means for notifying the mobile station that has made the emergency communication request when the transmission right of the transmission station is released, to the group communication device. In any one of Claims 1 thru | or 7,
The group communication device, wherein the line control device does not grant a transmission right to a mobile station other than the mobile station that has made the emergency communication request for a predetermined time after the transmission right is released. In claim 2 or 7,
The group communication apparatus, wherein the mobile station has a display unit for displaying the notification. In any one of Claims 1 thru | or 6.
The base station further notifies whether or not the transmission right is reserved by the emergency communication request. In claim 10,
The group communication apparatus according to claim 1, wherein the base station has a timer for canceling the reservation of the transmission right after a lapse of a predetermined time. In any one of Claims 1 thru | or 6.
The base station further notifies the mobile station whether or not the mobile station may make a normal transmission right request. In claim 3,
A group communication apparatus, wherein each base station has the timer instead of the line control apparatus.

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