JP4486424B2 - Broadcast communication control method in digital radio system - Google Patents

Description

  The present invention relates to a broadcast communication control method in a digital radio system suitable for application to, for example, a municipal digital mobile communication system composed of a plurality of base stations and a plurality of radio terminal stations (fixed stations and mobile stations).

  Recently, the introduction or maintenance of municipal digital mobile communication systems (see Non-Patent Document 1) used for disaster prevention administration etc. is planned for municipalities throughout the country.

  Such a municipal digital mobile communication system requires so-called broadcast communication (one-to-many communication) in which the same message is simultaneously transmitted from a base station to a plurality of wireless terminal stations (fixed station and mobile station). There is a case.

  A broadcast communication control method according to the prior art will be described with reference to a frame configuration diagram shown in FIG. 8 by taking a 4-multiplex TDM / TDMA system as an example.

  FIG. 8 shows the configuration of the downlink frame and the uplink frame. In each of the claims above and below, one frame with a frame length of 40 [ms] corresponds to three communications of 10 [ms] up to slots 0, 1 and 2, respectively. It has four slots 0 to 3 consisting of a channel (also called Tch) and one common control channel of slot 3.

  Here, the common control channel of slot 3 is a channel (also referred to as a slot) used in common with the radio terminal station, and the communication channels of slots 0 to 2 are transmitted to the radio terminal station by the base station. This is a channel (also referred to as a slot) to be assigned.

  In general, in broadcast communication (one-to-many communication), unidirectional communication (communication in which information is transmitted in a downlink direction from a base station to a plurality of wireless terminal stations) is performed. Control information such as that the wireless terminal station has been activated in response to a broadcast call from the base station or that the wireless terminal station has been off-hook after being activated is transmitted in the base station direction, that is, in the upstream direction. Is needed.

  More specifically, when broadcast communication is activated, a call is first made from a base station to a target wireless terminal station (also referred to as a target station) using a common control channel of a downlink frame. At the time of this call, a communication channel for performing broadcast communication is designated (also referred to as Tch designation. In FIG. 8, the communication channel of slot 1 in the upper and lower frames is designated as the designated communication channel). The called radio terminal station transmits / receives broadcast communication at the timing of the designated communication channel.

  In this case, in the upstream frame, in the communication channel of the designated slot 1, prior to the broadcast communication, as shown in the lower part of FIG. However, it is necessary to share and use the communication channel (broadcast communication control channel) of slot 1 which is a designated communication channel among a plurality of radio terminal stations. The collision avoidance control related to the transmission of the control information becomes inevitable.

  As this collision avoidance control technique, there are first and second collision avoidance control techniques described below. In the first collision avoidance control technique, a transmission right is assigned to each wireless terminal station by transmission right control such as polling or press talk communication from the base station, and control information is transmitted.

  In the second collision avoidance control technique, the upper and lower frame structure shown in FIG. 8 is used, and as shown in FIG. The control channel is expanded as the same channel specifications as the channel, the slot numbers used for each wireless terminal station are pre-defined, and distributed to multiple channels, and the control information is transmitted in the same way as the common channel (Patent Document 1).

JP 2001-326605 A (FIG. 2) Municipal digital mobile communication system TYPE1 standard ARIB STD-T79 1.0 version September 6, 2001

  However, in the polling and transmission right control by the first collision avoidance control technique, the procedure up to the transmission of control information is complicated, and there is a problem that the time required for transmission of control information per station becomes long. .

  In addition, when a plurality of communication channels are allocated for the common control channel as in the second collision avoidance control technique, control information transmission is distributed by the number of added control channels. Although the time required for communication is shortened, the communication channel temporarily assigned to the control channel is not always free, and the communication channel is used extra, so while using the communication channel There is a problem that other communication cannot be performed.

  The present invention has been made in consideration of such various problems, and at the time of broadcast communication, collision avoidance control related to transmission of control information can be performed without expanding the communication band for transmission of control information. An object of the present invention is to provide a broadcast communication control method in a digital radio system that can achieve high-speed transmission of control information and simplification of communication control.

According to the broadcast communication control method in the digital radio system according to the present invention, the control channel commonly used for the plurality of radio terminal stations and the base station for the plurality of radio terminal stations are respectively used in the upper and lower frames. In a digital radio system that includes a plurality of communication channels that are allocated by and used in common by the plurality of radio terminal stations and that communicates between the base station and the plurality of radio terminal stations using the upper and lower frames In the communication control method, when performing broadcast communication from the base station to the wireless terminal station, the common control channel of the downlink frame is used for the wireless terminal station performing broadcast communication from the base station. It notifies that the broadcast Te, in the plurality of communication channels of the upper Ri frame, a predetermined communication channel, specify the broadcast control channel A calling step for performing a broadcast call, and each of the called wireless terminal stations sets the broadcast control channel in the designated uplink frame according to an identification number assigned in advance to the wireless terminal station. Control information is implemented using time division, and a control information notification step of notifying the base station is provided.

  According to the present invention, each of the wireless terminal stations called by the broadcast call from the base station follows the identification number assigned to the wireless terminal station in advance in the uplink frame designated by the base station. Since the control information is implemented by using the broadcast control channel, which is a predetermined communication channel, in a time-sharing manner and configured to have a control information notification step for notifying the base station, a communication band for transmitting control information It is possible to simultaneously increase the speed of transmission of control information and simplify communication control without extending.

  The effect will be explained more specifically. Collision avoidance control related to control information transmission can be performed without expanding the communication band for transmitting control information. It is possible to perform desired communication between a non-radio terminal station and a base station. In addition, since it is not necessary to perform polling or transmission right control, speeding up of transmission of control information and simplification of communication control are achieved at the same time.

  Further, according to the present invention, the proper use of the broadcast communication control channel and the normal communication channel is uniquely determined when the broadcast communication is called, so there is no need to notify each wireless terminal station in advance. is there.

  Furthermore, according to the present invention, for a wireless terminal station that moves between a plurality of base station zones, such as a mobile station, the location information when the location information changes temporarily only within that base station zone Since the usable identification numbers are dynamically assigned, the above-described effects can be achieved even if the base station zone changes.

  In addition, the broadcast control channel number in the designated uplink frame is periodically notified by the accompanying channel in the downlink frame communication channel, and is called in the control information notification step. The wireless terminal station compares the notified channel number of the broadcast control channel with the identification number of the own station, determines the timing at which the own station uses the broadcast control channel in an uplink frame, and performs control Since the information is notified, it is possible to reliably transmit the control information while avoiding the collision.

  According to the present invention, during broadcast communication, collision avoidance control related to control information transmission can be performed without expanding the communication band for transmitting control information, and the transmission of control information can be speeded up and communication control can be simplified. The effect that can be performed simultaneously is achieved.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings referred to below, the same reference numerals are given to the components corresponding to those shown in FIGS. 8 and 9, and the detailed description thereof is omitted.

  FIG. 1 is a block diagram showing a configuration of a digital radio system 20 to which the broadcast communication control method in the digital radio system according to this embodiment is applied.

  The digital radio system 20 includes a line control device 12, to which a broadcast communication control device 10 and a plurality of base stations 14 of 1 to m stations are connected.

Each base station 14 accommodates a plurality of radio terminal stations 16 _{1 to} 16 _{n of 1 to} n stations, which are mobile stations or fixed stations, in a base station zone 18 which is a communicable range constituting a digital radio interface area. The The mobile station can be used by the user moving to another base station zone 18. In practice, adjacent base station zones 18 have overlapping zones that share areas so that communication is not interrupted, but in this embodiment, they are drawn separately for ease of understanding. .

Line controller 12, controls the line connection and disconnection between the wireless terminal station 16 ₁ ~ 16 _n existing in the wireless terminal station 16 ₁ ~ 16 _n and the other base station 14 present in the first base station 14 In addition, under the control of the broadcast communication control device 10, the base station 14 controls connection / disconnection of the broadcast communication from the broadcast communication control device 10 to the radio terminal stations 16 _{1 to} 16 _n .

Similarly to the mobile phone system or the like, the line control device 12 determines in which base station zone 18 all the wireless terminal stations 16 _{1 to} 16 _n are currently located, for example, an appropriate position detection method. regular wireless terminal station 16 ₁ ~ 16 _n from the radio terminal station 16 ₁ ~ 16 _n 1 stations of a specific station number information for identifying the one station by transmitting using the communication channel of the uplink frame The line control device 12 can detect the base station zone 18 where one of the wireless terminal stations 16 _{1 to} 16 _n and one station are located, and can register and update them in a location registration memory (not shown). .

FIG. 2 is an explanatory diagram of identification numbers ID assigned to the wireless terminal stations 16 _{1 to} 16 _n for broadcast communication for each base station zone 18 of the base station 14 of _{1 to m} stations.

That is, for the wireless terminal stations 16 _{1 to} 16 _n located in each base station zone 18, an identification number related to broadcast communication is separately provided for the fixed wireless terminal station (fixed station) separately from the station number information in advance. The ID is fixedly assigned (static: so that it is not changed after being determined at the time of installation), recorded in the memory of the wireless terminal stations 16 _{1 to} 16 _n , and in the location registration memory of the line control device 12 Is recorded corresponding to the station number information. In addition, an identification number ID that can be used only within the base station zone 18 is temporarily dynamically assigned to the mobile radio terminal station (mobile station) at the time of location registration when the location information changes. Then, when a certain mobile station moves to a different base station zone 18, it is reassigned by reporting the station number information and the identification number in pairs using the common control channel of the downlink frame, and the radio terminal station that is the mobile station 16 _{1 to} 16 _n and recorded in the position registration memory of the line controller 12 in correspondence with the station number information.

In this embodiment, wireless terminal stations 16 _{1 to} 16 _n that can be broadcast communication target stations including a total of 128 fixed stations and a maximum of 64 mobile stations are included in one base station zone 18. Be contained.

  As described above, when the mobile station moves to a different base station zone 18, the dynamic identification number ID assigned to the mobile station is the location registration procedure, specifically, the mobile station It is possible to determine whether or not the base station zone 18 has been moved based on the broadcast information included in the common control channel of the downstream frame. The mobile station that has determined that it has moved in the base station zone 18 performs the location registration in the base station zone 18 that is in the base station 14 by the location registration message of the common control channel in the upstream frame. When newly assigned.

  It should be noted that the distribution of identification numbers ID for fixed stations and mobile stations and the number of accommodated stations in one base station zone 18 can be freely changed according to system requirements.

In the digital radio system 20 shown in FIG. 1, the frame configuration between each base station 14 and the radio terminal stations 16 _{1 to} 16 _n is described as being based on the TDM / TDMA system by the 4-multiplex shown in FIG. However, the same applies to the FDMA system.

  FIG. 3 is a descriptive view provided for explaining the operation of this embodiment using the upper and lower frame configurations, reprinting the same configuration as that of the upper and lower frames shown in FIG.

As can be seen from FIG. 3, downlink frames (frames used for communication from the base station 14 to the radio terminal stations 16 _{1 to} 16 _n ) and uplink frames (communication from the radio terminal stations 16 _{1 to} 16 _n to the base station 14). Frame) used for each of the plurality of wireless terminal stations 16 _{1 to} 16 _n , one common control channel of the slot 3 that is used in common and the plurality of wireless terminal stations 16 _{1 to} 16 _n. And a plurality of communication channels (also referred to as Tch) of three slots 0, 1, and 2 that are allocated by each base station 14 and are commonly used by a plurality of wireless terminal stations 16 _{1 to} 16 _n . Yes.

  FIG. 4 shows a downlink communication channel (also referred to as a downlink communication channel), which is a unit of a superframe consisting of 18 frames, and the broadcast control channel number corresponding to the identification number ID is periodically 1 shows a state of being broadcast on one associated channel (referred to as ACCH).

This accompanying channel is a small-capacity data communication area included in the communication channels of slots 0 to 2 in frame 1 and is received by all the wireless terminal stations 16 _{1 to} 16 _n located in the same base station zone 18. It is possible. As shown in FIG. 4, a broadcast control channel number corresponding to the identification number ID = 0 to 127 is inserted into this accompanying channel in a time division manner. Each of the wireless terminal stations 16 _{1 to} 16 _{n with the} identification numbers ID = 0 to 127 is, for example, the slot 1 of the frame 1 of the superframe counter of the leftmost superframe in FIG. 4 (downlink frame in FIG. 3). When the broadcast control channel number 1 (corresponding to the identification number ID = 1) is stored in the channel associated with the communication channel of slot 1), the communication channel broadcast of slot 1 of frame 2 of the superframe counter is transmitted. It can be calculated that the communication control channel number corresponds to channel number 2 (ID number = 1). Similarly, broadcast control channel number 19 (corresponding to identification number ID = 19) is stored in the accompanying channel of frame 1 of the next superframe.

That is, each of the wireless terminal stations 16 _{1 to} 16 _n receives the broadcast communication channel number stored in the associated channel in the communication channel in the slot 1 of the frame 1 and the same in the communication channel in the slot 1 of the next frame 2. The broadcast control channel number is calculated and specified, and the broadcast control channel of the timing at which the control information of the local station is installed, that is, the communication channel of slot 1 is determined by the broadcast control channel number and the identification number ID of the local station Can be determined. Thus, by using a specific slot of a communication channel in a frame as a logical channel in a time division manner, it is possible to avoid an uplink communication collision of control information during broadcast communication.

  FIG. 5 is an explanatory diagram of a method of using the communication channel of slot 1 of the physical downlink frame designated as the broadcast control channel at the timing of implementing the control information of the local station when the broadcast communication is called.

As shown in FIG. 5, the corresponding slot of the upstream frame corresponding to the broadcast control channel number informed by the associated channel of the downstream frame of FIG. 4, in this embodiment, slot 1 (the upstream frame diagram of FIG. 3 is also shown). Is used in a time-sharing manner by the wireless terminal stations 16 _{1 to} 16 _n having the specified identification number ID, and the control information is mounted and transmitted to the base station 14 in which it is located.

According to this embodiment, as shown in FIG. 3, in the upper and lower frames, the common control channel of slot 3 and the plurality of wireless terminal stations that are used in common for the plurality of wireless terminal stations 16 _{1 to} 16 _n , respectively. 16 _{1 to} 16 _n are assigned by each base station 14 and include communication channels in slots 0 to 2 that are used in common by a plurality of wireless terminal stations 16 _{1 to} 16 _n . In the digital radio system that performs communication between each base station 14 and the radio terminal stations 16 _{1 to} 16 _n located in the base station zone 18 of each base station 14 using the upper and lower frames, the following broadcast is performed. Perform communication control.

First, the base station 14 notifies the wireless terminal stations 16 _{1 to} 16 _n that perform broadcast communication using the common control channel of slot 3 of the downlink frame, and notifies that the downlink frame is transmitted. Among a plurality of communication channels, a predetermined communication channel, here, the communication channel of slot 1 is designated as a broadcast control channel and notified, and a predetermined communication channel, here, slot 1 is specified among the plurality of communication channels of the uplink frame. Broadcast communication is designated by designating the communication channel as the broadcast control channel.

Next, each of the called radio terminal stations 16 _{1 to} 16 _n corresponds to the designated uplink frame according to the identification number ID (ID = 0 to 127) assigned in advance to the radio terminal stations 16 _{1 to} 16 _n . The control information is implemented using the broadcast control channel of slot 1 in the time division manner (for example, as shown in FIG. 3, the broadcast control channel of the leftmost slot 1 of the uplink frame is broadcast). When the wireless terminal stations 16 _{1 to} 16 _n assigned with the identification number ID = n−1 corresponding to the control channel number implement the control information, the broadcast communication is performed on the broadcast control channel of the next slot 1 of the uplink frame. The wireless terminal stations 16 _{1 to} 16 _n assigned with the identification number ID = n corresponding to the control channel number implement the control information.), And notifies the base station 14 of the control information.

When performing broadcast communication, the control information notified from the wireless terminal stations 16 _{1 to} 16 _n to the base station 14 includes identification number ID information, wireless terminal activation information of the wireless terminal stations 16 _{1 to} 16 _n , off-hook information by the user of the wireless terminal station 16 ₁ ~ 16 _n, a受令confirmation information or the like by the user of the wireless terminal station 16 ₁ ~ 16 _n.

  The base station 14 that has received the radio activation information, the off-hook information, etc. during the broadcast communication, under the control of the line control device 12 and the broadcast communication control device 10, performs communication in slot 1 of the downstream frame as shown in FIG. Broadcast data (voice data or non-voice data) is transmitted using the channel.

As a result, broadcast communication is executed for the target wireless terminal stations 16 _{1 to} 16 _n . After the broadcast communication is performed, the reception confirmation is performed. When the reception confirmation is performed, the broadcast communication ends.

According to the embodiment described above, each of the broadcast call by the called target terminal station 16 ₁ ~ 16 _n from base station 14, pre-assigned to the target wireless terminal station 16 ₁ ~ 16 _n According to the identification number ID, control information is implemented by using a broadcast communication channel, which is a predetermined communication channel in an uplink frame designated by the base station 14, in a time division manner, and notification of control information to be notified to the base station 14 Since it is configured to include steps, it is possible to avoid communication collisions and simultaneously increase the speed of control information transmission and simplify communication control without expanding the communication bandwidth for transmitting control information.

It is to be noted that, during broadcast communication, for example, the wireless terminal stations 16 _{1 to} 16 _n and the base station 14 that are not targeted for broadcast communication are transmitted during the transmission of control information using an available communication channel. Desired communication can be performed.

Also, since the proper use of the broadcast control channel and the normal communication channel is uniquely determined at the time of calling the broadcast communication, the broadcast communication control for each wireless terminal station 16 _{1 to} 16 _n is performed in advance. It is not necessary to broadcast the channel.

  Next, the broadcast communication control method in the digital radio system 20 according to the embodiment of the present invention described above will be additionally described with reference to the sequence diagrams of FIGS.

  When broadcast communication is performed, in FIG. 6, first, a common control channel communication phase is performed, and a broadcast communication activation request is supplied from the broadcast communication control device 10 to the line control device 12. The line control device 12 returns a broadcast communication start response (acknowledge) to the broadcast communication control device 10 and sends a broadcast communication transmission request to the base station 14 that requires the broadcast communication.

The base station 14 that has received the broadcast transmission request uses the common control channel of the slot 3 in the downlink frame to the broadcast target stations (in this case, wireless terminal stations 16 _{1 to} 16 _n ). Then, a broadcast communication call for notifying that it is a broadcast communication including a group ID of the broadcast communication is performed (common control channel communication phase). At the time of this broadcast call, at the same time, a predetermined communication channel (one of communication channels 0 to 2 is used in this embodiment as shown in FIG. 3). In this embodiment, one of the communication channels 0 to 2 is a predetermined communication channel among a plurality of uplink communication channels. As shown in FIG. 3, the communication channel of slot 1 in the upstream frame is designated as the broadcast control channel.

  FIG. 3 shows a case where the communication channel of slot 1 of the upstream frame is assigned to the control channel for broadcast communication during broadcast communication.

  Although a part of the description overlaps, in FIG. 3, one frame including slots 0 to 3 has a length of 40 [ms], and a downstream frame is a communication channel of three slots 0 to 2 of 10 [ms]. (Also referred to as Tch) and slot 0 to slot 3 of one common control channel of slot 3. The upstream frame is composed of one broadcast control channel in slot 1 (normally a communication channel), two communication channels in slots 0 and 2, and one common control channel in slot 3.

  As described above, the common control channel is a channel (also referred to as a slot) that is commonly used for the wireless terminal station, and the communication channel is a channel (also referred to as a slot) that is allocated to the wireless terminal station by the base station. Say.)

In FIG. 3, broadcast data and non-speech data (character / image data) are implemented in the communication channel of slot 1 of the downstream frame in which broadcast communication is performed. In the uplink frame, the communication channel of slot 1 is used in a time division manner as a broadcast control channel in which control information of the target wireless terminal stations 16 _{1 to} 16 _n in the predetermined base station zone 18 is temporarily mounted. The

  Next, in the downlink communication channel activation phase, the synchronization burst signal SB1 is transmitted from the base station 14 in the designated downlink communication channel, that is, slot 1.

Next, when the synchronization burst signal SB1 is received in the terminal station radio activation state notification phase, the radio terminal stations 16 _{1 to} 16 _n receive the uplink frame broadcast control channel (broadcast communication of the uplink frame in FIG. 3). As described with reference to FIG. 3 and FIG. 5, the control channel is used in time division, and control information is mounted and transmitted to the base station 14. As a result, the fact that each of the radio terminals of the radio terminal stations 16 _{1 to} 16 _n has been activated, in other words, that the radio terminal stations 16 _{1 to} 16 _n have changed to the broadcast state is indicated via the base station 14 via the line control device 12. And the broadcast communication control device 10 understand.

Next, when the wireless terminal stations 16 _{1 to} 16 _n are off-hooked or the like by the user in the terminal station broadcast response state notification interface, the uplink frame broadcast control channel is similarly used in a time division manner, and the control information is off-hook. The information is mounted and transmitted to the base station 14. Thereby, the line control device 12 and the broadcast communication control device 10 through the base station 14 understand that the wireless terminal stations 16 _{1 to} 16 _n are in a transmission standby state.

  Next, in the broadcast communication phase (for the sake of easy understanding, the lowermost part of FIG. 6 and the uppermost part of FIG. 7 are drawn), the broadcast controller 10 to the line controller 12 and the base Through the station 14, voice data or non-voice data, which is the communication content of the broadcast communication, is mounted on the communication channel of the slot 1 and transmitted through the slot 1 of the communication channel of the downlink frame (see the downlink frame in FIG. 1).

Next, as shown in FIG. 7, in the terminal station command confirmation state notification phase, a broadcast command confirmation request is sent from the broadcast communication control device 10 via the line control device 12 and the base station 14 in common with the downstream frame. It is mounted on the control channel and transmitted to the wireless terminal stations 16 _{1 to} 16 _n .

Also at this time, the wireless terminal stations 16 _{1 to} 16 _n use the broadcast control channel of the upstream frame in a time division manner, and transmit the reception confirmation to the embedded base station 14 as control information.

The reception confirmation is transferred from the base station 14 to the line control device 12, and the line control device 12 that has received the reception confirmation transmits to the wireless terminal stations 16 _{1 to} 16 _n via the base station 14 in the communication channel end phase. On the other hand, it is implemented in a control channel associated with the communication channel of the downstream frame and sends a broadcast communication end request, and sends a broadcast communication end request to the broadcast communication control device 10.

  Then, when the line control device 12 receives the broadcast end response from the broadcast control device 10, the broadcast communication is completed, and the broadcast control channel shown in FIGS. Returned to the structure of the communication channel.

As described above, according to the above-described embodiment, in the digital radio system 20 composed of a plurality of base stations 14 and a plurality of radio terminal stations (fixed stations and mobile stations) 16 _{1 to} 16 _n , The control information at the time of the broadcast communication of the target wireless terminal stations 16 _{1 to} 16 _n (also referred to as broadcast reception terminals) is time-divided using the common communication channel of the uplink frame as the broadcast control channel, The base station 14 is notified by assigning the broadcast control channel as the divided logical channel to the broadcast control channel of each wireless terminal station.

For this reason, collision avoidance control related to transmission of control information can be performed without extending the communication band for transmission of control information. For example, during the transmission of control information, for example, the wireless terminal station 16 ₁ that is not a call target for broadcast communication is used. It is possible to perform desired communication between ˜16 _n and the base station 14. In addition, since it is not necessary to perform polling or transmission right control, speeding up of transmission of control information and simplification of communication control are achieved at the same time.

In this case, the proper use of the broadcast communication control channel and the normal communication channel is uniquely determined when the broadcast communication is called, so that it is not necessary to notify each of the radio terminal stations 16 _{1 to} 16 _n in advance. is there.

In addition, for the wireless terminal stations 16 _{1 to} 16 _n that move between a plurality of base station zones 18 such as mobile stations, the location is temporarily stored in the base station zone 18 when the location information is changed. Therefore, even if the base station zone 18 in which the wireless terminal stations 16 _{1 to} 16 _n are located is changed, the above-described effect is achieved.

In addition, since the channel number of the broadcast control channel in the designated upstream frame is periodically notified by the accompanying channel in the communication channel of the downstream frame, the wireless terminal station 16 _{1 on} which the broadcast communication is called is made. ~ 16 _n compare the notified broadcast control channel number with the identification number ID of the own station, determine the timing at which the own station uses the broadcast control channel in the uplink frame, Since the notification is performed, the control information can be reliably transmitted while avoiding the collision.

  Note that the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted based on the contents described in this specification.

1 is a configuration block diagram of a digital radio system to which an embodiment of the present invention is applied. It is explanatory drawing of the ID number allocated to the radio | wireless terminal station located in each base station zone. It is explanatory drawing of an example of a structure of an upstream frame and a downstream frame. It is explanatory drawing of the broadcast control channel number alert | reported by an accompanying channel, and its timing relationship. FIG. 5 is an explanatory diagram of a correspondence relationship between each wireless terminal station and a wireless communication control channel that can be transmitted. It is a sequence diagram (1/2) with which it uses for description of operation | movement of one Embodiment of this invention. It is a sequence diagram (2/2) with which it uses for description of operation | movement of one Embodiment of this invention. It is explanatory drawing of the upper and lower frame at the time of the broadcast communication which concerns on a prior art. It is explanatory drawing of the upper-lower frame at the time of the broadcast communication which concerns on another prior art.

Explanation of symbols

10 ... broadcast controller 12 ... line control unit 14 ... base station 16 ₁ ~ 16 _n ... wireless terminal station 18 ... base station zone 20 ... digital radio system

Claims (3)

A control channel that is commonly used for a plurality of radio terminal stations in the upper and lower frames, and a plurality of communications that are assigned by the base station to the plurality of radio terminal stations and are commonly used by the plurality of radio terminal stations In a communication control method in a digital radio system that includes a channel and performs communication between the base station and the plurality of radio terminal stations using the upper and lower frames,
When performing broadcast communication from the base station to the wireless terminal station,
To the wireless terminal station that performs broadcast communication from the base station, and notifies that using the common control channel of the downlink frame is a broadcast, in the plurality of communication channels of the upper Ri frame, predetermined A call step for performing a broadcast call that designates the communication channel as a broadcast control channel;
Each of the called wireless terminal stations implements control information by using the broadcast control channel in the designated uplink frame in a time division manner according to an identification number assigned in advance to the wireless terminal station. And a broadcast information control method in a digital radio system, comprising: a notification step of control information to be notified to the base station. The broadcast communication control method in the digital wireless system according to claim 1,
In the step before the calling step,
The wireless terminal station identification number has a step of fixedly assigning a fixed station in advance to each base station zone and dynamically assigning a mobile station according to a change in position information. A broadcast communication control method in a wireless system. In the broadcast communication control method in the digital radio system according to claim 1 or 2,
Further, the broadcast control channel number in the designated uplink frame is periodically notified by an accompanying channel in the downlink communication channel,
In the notification step of the control information, the called radio terminal station compares the broadcast channel number of the broadcast communication control channel with the identification number of the local station, and the local station transmits the broadcast information in the uplink frame. A broadcast communication control method in a digital radio system, characterized in that a timing for using a communication control channel is determined and the control information is notified.

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