JP4609667B2 - Radio system, base station radio apparatus and mobile station radio apparatus - Google Patents

Description

  The present invention is a mixture of a "stationary transmission" mode base station radio apparatus that continues to transmit downlink radio waves after power-on and a "emergency transmission" mode base station radio apparatus that transmits downlink radio waves only when there is a communication request. In particular, the present invention relates to a base station radio apparatus and a mobile station radio apparatus used in the radio system.

  FIG. 8 shows the configuration of a conventional analog fire-fighting emergency radio system. In FIG. 8, 10A is a control station that controls the entire system, and 20A is a base station composed of a plurality of analog-type base station radio devices 21A to 25A controlled by the control station 10A (here, five examples are shown). A wireless device group 30A represents an analog mobile station wireless device mounted on a fire engine or an ambulance.

  In the control station 10A, 11 is a LAN, 12 is a command board on which various commands are issued by an operator who has received a 119th fire and ambulance report, 13 is a command issued by the command board 12, and the fire channel “city” The command control device is connected to “1” and “city 2” and the emergency channel “emergency”. Reference numeral 14 denotes a radio control table, which splits the signals of the “city 1”, “city 2”, and “emergency” channels into a plurality of signals, or receives them centrally.

  In the base station radio apparatus group 20A, base station radio apparatuses 21A to 25A are mobile stations mounted on fire engines or ambulances by radio frequencies of the fire channels “City 1” and “City 2” or the emergency channel “Ambulance”. Mutual communication is performed with the wireless device 30A.

  In the conventional analog fire fighting and emergency radio system, the base station radio devices 21A to 25A are in the “emergency transmission” mode, that is, whenever a communication request from the control station 10A or a communication request from the mobile station radio device 30A is generated. It operates in a mode that emits radio waves and stops emitting radio waves when communication is completed. In this analog radio system, since it is not necessary to synchronize between the base station radio devices 21A to 25A and the mobile station radio device 30A when communicating, a plurality of channels set to the same channel in the communication area. The base station radio devices 21A to 25A can be operated, and the channel selection on the mobile station radio device 30A and the control station 10A side is generally performed manually, and automatic communication area switching is performed. Even if there is no function, it can be operated without any problems.

  When calling the mobile station radio device 30A from the control station 10A, the call is made via any one of the base station radio devices 21A to 25A that communicated last time. Or if base station radio | wireless apparatus 21A-25A is receiving the electromagnetic wave from mobile station radio | wireless apparatus 30A simultaneously, it will call via the base station radio | wireless apparatus with the highest reception level. If there is no response from the target mobile station radio device 30A, for example, while the mobile station radio device 30A is moving to another location, another mobile station radio device 30A is called in sequence.

  A communication request from the mobile station radio device 30A is received by all the base station radio devices 21A to 25A and is received by the control station 10A. This is because the analog system is used, so that even if voices from one mobile station radio apparatus 30A are received by a plurality of base station radio apparatuses 21A to 25A, they can be heard at the same time, so there is no problem.

  By the way, it is decided that the current analog-type fire-fighting and emergency radio system will be banned in the near future. Therefore, an SCPC (Single Channel Per Carrier) method has been proposed as a digital wireless access method for allocating one channel per communication.

  In the SCPC system, unlike the analog system, it is indispensable to match the timing of drawing in communication by exchanging synchronization bursts between the base station radio apparatus and the mobile station radio apparatus before shifting to communication. Further, it is essential that the uplink signal received from the mobile station radio apparatus is “turned back” by the base station radio apparatus. This is to prohibit other mobile station radio devices in the communication area by the base station radio device (because otherwise interference will occur and mutual signals will be broken), and eventually This is because the audio signal from the mobile station radio apparatus is heard by other mobile station radio apparatuses.

  As described above, in the SCPC system in which it is indispensable for the uplink signal from a specific mobile station radio apparatus to be “turned back” to the other mobile station radio apparatus by the base station radio apparatus, it is the same within the communication area. It becomes impossible to arrange two or more base station radio apparatuses set in the channel.

Further, in the SCPC method, automatic communication area switching can be easily realized within the communication area of the base station radio apparatus in the “always-on” mode. Patent Document 1 describes that the timing of switching the radio zone of the mobile station radio device is notified when the reception level decreases.
JP 59-146232 A

  However, the reception level cannot be detected within the communication area of the base station radio apparatus in the “emergency transmission” mode, which increases the burden on the operator of the mobile station radio apparatus and may hinder normal operation.

  As described above, the base station radio device that performs the “turnback” of the uplink signal from the mobile station radio device and the realization of the automatic communication area switching function can be achieved by the SCPC base station radio device [[normal transmission]. Mode and single channel] can be easily realized, but considering the transition from the analog system to the digital SCPC system, all the base station radio devices are set to ["always-on" mode and single channel]. However, it is required to mix base station radio apparatuses in the operation mode of “emergency transmission” from the viewpoint of frequency resources and budget. In this case, the operator of the mobile station radio device must always check whether the current position is the “always-on” area or the “emergency-out” area. Even in an area, it is necessary to always prepare for channel switching.

  The object of the present invention is that an operator of a mobile station radio apparatus is assumed to be a base station while assuming that a base station radio apparatus in an “ordinary transmission” operation mode and a base station radio apparatus in an “emergency transmission” operation mode coexist. It is an object of the present invention to provide a radio system that can be operated without being aware of whether the operation mode of the radio apparatus is “regular transmission” or “emergency transmission”, and a base station radio apparatus and a mobile station radio apparatus used therefor.

In order to achieve the above object, a radio system according to a first aspect of the present invention includes a control station that issues a command, a mobile station radio device, and a plurality of relays that relay communication between the control station and the mobile station radio device. A radio system in which a plurality of base station radio devices include a base station radio device in an “always-on” operation mode and a base station radio device in an “emergency transmission” operation mode. The mobile station radio apparatus performs location registration transmission on a specific channel to the plurality of base station radio apparatuses, and a specific base station radio apparatus among the plurality of base station radio apparatuses is configured to transmit the mobile station radio apparatus. A response signal to the location registration transmission including information on the operation mode is transmitted on the specific channel.
According to a second aspect of the present invention, in the radio system according to the first aspect, the mobile station radio device includes means for informing information about an operation mode transmitted from the specific base station radio device. Features.
According to a third aspect of the present invention, in the wireless system according to the first or second aspect, the mobile station wireless device always receives the response signal including the operation mode of “always-on”, and always performs the specific operation. When the radio wave from the base station radio apparatus is received and the reception level falls below a predetermined value, the location registration transmission is resumed on another channel.
The base station radio apparatus of the invention according to claim 4 is a base station radio apparatus in an operation mode of “normal transmission” or “emergency transmission” that relays communication between the mobile station radio apparatus and the control station that issues a command. In addition, information on the operation mode is included in a response signal to the mobile station radio apparatus for the location registration transmission received from the mobile station radio apparatus.
A mobile station radio apparatus according to a fifth aspect of the present invention is a mobile station relayed between a control station that issues a command via a base station radio apparatus that operates in an operation mode of “normal transmission” or “emergency transmission”. A wireless device that performs location registration transmission to the base station wireless device and can receive information on the operation mode in a response signal transmitted from the base station wireless device in response to the location registration transmission. It is characterized by that.
The invention according to claim 6 is the mobile station radio apparatus according to claim 5, further comprising means for notifying information on the operation mode.

  According to the present invention, location registration transmission is performed from the mobile station radio apparatus to the base station radio apparatus, and accordingly, information on the operation mode is transmitted from the base station radio apparatus to the mobile station radio apparatus as a response signal. Even if there are a plurality of base station radio devices in the “regular transmission” mode and the “emergency transmission” mode, the mobile station radio device can identify the base station radio device to communicate with, and places a burden on the operator. Therefore, the system development similar to the analog system can be performed, the fire and ambulance work can be performed smoothly, and the operation / cost is highly effective.

  In the SCPC wireless system of the present invention, when the mobile station wireless device is turned on, when the reception level from the base station wireless device (operation mode “normal transmission” only) is deteriorated, or when the channel is changed by the operator of the mobile station wireless device As a trigger, the mobile station radio device transmits a location registration prior to the original communication, and the base station number and operation mode (“regular transmission” / “emergency” of the specific base station radio device with which the mobile station radio device should communicate Send ") is registered with the mobile station radio device and broadcast there. Thereby, at the time of the original communication request, by designating the base station number in the signal transmitted from the mobile station radio apparatus, communication with the control station is performed via the base station radio apparatus. Then, when the mobile station wireless device moves into the communication area of another base station wireless device in the “always-on” mode or into the communication area of another base station wireless device in the “emergency transmission” mode, New location registration is triggered by level deterioration or channel change. As described above, even if the base station radio device in the “normal transmission” mode and the base station radio device in the “emergency transmission” mode coexist, the operator of the mobile station radio device is aware of the operation mode and communication area of the base station radio device. To be able to operate without having to

<Basic configuration>
In FIG. 1, 10 is a control station that controls the entire system, and 20 is a base station radio composed of a plurality of base station radio devices 21 to 25 (5 examples are shown here) controlled by the control station 10. A device group 30 is a digital mobile station radio device mounted on a fire engine or an ambulance.

  In the control station 10, 11 is a LAN, 12 is a command board on which various commands are issued by an operator who has received a fire and emergency report of No. 119, 13 is a command channel issued by the command board 12, and the fire fighting channel “city” The command control device is connected to “1” and “city 2” and the emergency channel “emergency”. Reference numeral 14 denotes a radio control table, which splits the signals of the “city 1”, “city 2”, and “emergency” channels into a plurality of signals, or receives them centrally. Reference numeral 15 denotes an SCPC control device. The SCPC control device 15 includes an analog interface with the radio control table 14 and a digital interface with each base station radio device 21 to 25, and each base station radio device 21 to 25 is a mobile station radio device 30. The base station wireless device to which the downlink signal is to be transmitted to the mobile station wireless device 30 is specified by receiving a signal indicating the reception level when receiving the location registration of the same channel.

  In the base station wireless device group 20, the base station wireless devices 21 to 25 are connected to the mobile station wireless device 30 with the digital firefighting channels “city 1” and “city 2” or the digital emergency channel “emergency”. Communication function by. Further, the base station radio devices 21 to 25 are equipped with an SCPC communication function and operate in the “normal transmission” mode or the “emergency transmission” mode. Also, the base station radio devices 21 to 25 set the operation mode and the base station number indicating the identification of “regular transmission” and “emergency transmission” in the downstream signal upon reception of the “turnback” instruction from the SCPC control device 15. And send it out. In addition, when an uplink signal is received from the mobile station radio apparatus 30 and the base station number is present, it is looped back by itself, and when there is no base station number, the instruction from the SCPC control apparatus 15 is followed.

  The mobile station radio device 30 implements the SCPC communication function and performs location registration during non-communication prior to the original communication. In this location registration, the location registration is transmitted without setting the base station number when the power is turned on, when the reception level deteriorates or when the channel is changed. Then, an operation mode and a base station number of the specific base station radio device are acquired from a response signal from a specific base station radio device among the base station radio devices 21 to 25, and a specific base station radio to be communicated in the future is acquired. Memorize the device. The operation mode and base station number of the specific base station radio apparatus are notified to the operator by a display or voice not shown.

<Operation of base station radio device>
FIG. 2 shows a flowchart of the operation of the base station radio apparatus in the “emergency transmission” operation mode among the base station radio apparatuses 21 to 25 in a specific channel. After the power is turned on, it waits for a signal from the control station 10 or the mobile station radio device 30 (S1), there is a communication request (S2-Y), and it is a reception from the mobile station radio device 30 ( In S3-reception, the received signal is determined (S4). At this time, if it is a synchronization burst (S4-synchronization burst), it is next determined whether or not the received content is location registration, and if it is reception of location registration (S5-Y), the control station 10 is informed. The received signal is transmitted (S6), and a response from the control station 10 is waited for a timer time (S7).

  At this time, the SCPC controller 15 of the control station 10 compares the reception levels of the reception signals of the specific channels from the mobile station radio apparatus 30 received by the base station radio apparatuses in the operation mode of “emergency transmission” with each other. The “return” instruction is issued to the base station radio apparatus (here, the base station radio apparatus 25) having the highest reception level (see FIG. 3). The devices 21 to 25 are described in the example of the operation mode of “emergency transmission”).

  As a result, the base station radio apparatus 25 having the highest reception level sets the base station number and the operation mode (“emergency transmission”) of the base station radio apparatus 25 (S8), to the mobile station radio apparatus 30. Downlink transmission is performed (S9). Other base station radio devices in the operation mode of “emergency transmission” have a low reception level and no “turnback” command is issued from the SCPC control device 15, so that a timeout occurs (S 7 -timeout) when the timer time elapses. . As described above, the mobile station radio apparatus 30 receives the base station number and the operation mode of the base station radio apparatus 25 as position registration. Whether or not the contents of this location registration are actually stored in the mobile station radio apparatus 30 depends on the reception level at the mobile station radio apparatus 30 as described later.

  After the content of the location registration is registered in the mobile station radio device 30, the base station radio device 25 receives an uplink signal from the mobile station radio device 30 and it is not reception of location registration (S5- If the base station numbers match (S11-Y), N) transmits a synchronization burst (S12) and performs a reception process (S13).

<Operation of mobile station radio device>
FIG. 4 shows a flowchart of the operation of the mobile station radio apparatus 30. When there is no communication after power-on and there is no channel change and no previous location registration (S21-N, S22-N, S23-N, S24-N), an all-channel search is performed (S25). That is, all channels of the mobile station radio device 30 are sequentially switched, and location registration is transmitted for each channel.

  FIG. 5 shows the details of this all-channel search. All channels are read from the nonvolatile ROM built in the mobile station radio device 30 (S251), the number of channels is set (S252), and one specific channel among them is set. Is set (S253), and location registration is transmitted (S254). In this location registration transmission, the base station number is undecided and, of course, is not set. As a result, a response (base station number and operation mode) from the base station radio apparatus is received and set temporarily (S255), and the number of channels is incremented by 1 (S257) as long as the set number of channels does not exceed (S256-N). ) By performing the same location registration transmission, a response to the location registration transmission for all channels is provisionally set.

  When there is one or more reception levels received by the mobile station radio device 30 by the location registration operation during this channel search (S26-Y), the reception levels are compared for each channel (S27). ), The location registration is transmitted for the channel of the highest reception level (S28). At this time, the base station number is set and transmitted. Thereby, the base station operation mode and the base station number are notified again from the base station radio apparatus of the base station (S8 in FIG. 2), that is, there is a response reception (S29-Y), and the reception level is equal to or higher than the specified value. If so (S30-Y), then the operation mode is determined (S31).

  When the operation mode is “always-on”, the operation mode is set and awaited (S32, S33). If there is no level deterioration or channel change (S34-N, S35-N), the presence / absence of a communication request is determined. (S36). If the operation mode is “emergency transmission”, the operation mode is set and awaited (S37, S38). If there is no channel change (S39-N), the presence / absence of a communication request is determined (S40).

  In the above, when there is a channel change in the middle (S22-Y, S35-Y, S39-Y), the channel after the change is set (S41), and position registration is transmitted (S42). As a result, the base station operation mode and the base station number are notified from a specific base station radio device (S8 in FIG. 2), that is, there is a response reception (S43-Y), and if the reception level is equal to or higher than a specified value. Next, the operation mode is determined (S31).

  If the previous location registration has been completed (S23-Y), the previous channel is set (S45), and the location registration is transmitted (S46). Thereby, the base station operation mode and the base station number are notified from a specific base station radio apparatus (S8 in FIG. 2), that is, there is a response reception (S47-Y), and if the reception level is equal to or higher than a specified value. Next, the operation mode is determined (S31).

  When there is a communication request in the middle (S21-Y, S24-Y, S36-Y, S40-Y), as shown in FIG. 6, if it is a transmission (S49-transmission), the base station number Is set (S50), and then a synchronization burst is transmitted (S51). In the case of reception (S49-reception), reception processing is performed (S52).

<Example of operation>
FIG. 7 is an operation explanatory diagram when the fire engine equipped with the mobile station radio device 30 moves in the communication areas A → B → D. The mobile station radio apparatus 30 implements all channels in the service area as channels. The base station wireless device 21 in the communication area A has a base station number “01”, an operation mode “always-on”, and a channel “city 1”. The base station radio device 22 in the communication area B has a base station number “02”, an operation mode “always-on”, and a channel “city 3”. The base station wireless device 23 in the communication area C has a base station number “03”, an operation mode “always-on”, and a channel “city 2”. The base station wireless device 24 in the communication area D has the base station number “04”, the operation mode “emergency transmission”, the channel “city 1”, the base station wireless device 25 has the base station number “05”, and the operation mode. Is “emergency delivery” and the channel is “city 1”. In FIG. 1, “city 3” was not used, but it was used here.

  When the mobile station radio apparatus 30 is turned on in the communication area A, the mobile station radio apparatus 30 first transmits a location registration on the channel “city 1”. At this time, the signal of the channel “city 1” has the maximum reception level at the nearest base station radio apparatus 21, and “back-up” is performed at this base station radio apparatus 21, and a location registration response is transmitted from here. Is called. This transmission signal is received by the mobile station radio device 30 and its reception level is provisionally set. Next, the mobile station radio device 30 similarly performs location registration transmission on the channel “city 2”. At this time, the reception level of the base station radio apparatus 23 having the channel “city 2” is temporarily set. Next, the mobile station radio device 30 similarly performs location registration transmission on the channel “city 3”. At this time, the reception level of the base station radio apparatus 22 having the channel “city 3” is temporarily set. Next, the mobile station radio device 30 selects, for example, the channel “city 1” of the highest reception level among the reception levels of the channels “city 1”, “city 2”, and “city 3”, and The location registration is transmitted for the channel “city 1”. As a result, if there is a response from the base station radio apparatus 21 on the channel “city 1” (base station number is “01”, operation mode is “normal transmission”) and the reception level is equal to or higher than the specified value, the operation at that time The mode is set in the mobile station radio device 30 and enters a standby state. Thereafter, when there is a communication request, the processing described in FIG. 6 is performed.

  For example, when noise increases during communication and the channel is changed from “City 1” to “City 2”, the above-mentioned location registration is transmitted again for the channel “City 2”. At this time, since there is a response from the base station radio device 23 on the channel “city 2” (the base station number is “03”, the operation mode is “normal transmission”), if the reception level is equal to or higher than the specified value, The operation mode at that time is set in the mobile station radio device 30, and communication is possible.

  When the fire engine moves from the communication area A to the communication area B after switching to the channel “city 2”, the reception level of the channel “city 2” does not decrease because it is in the vicinity of the base station wireless device 23. Communication is possible as it is. When the mobile station radio apparatus 30 further moves to the communication area D and the reception level of the channel “city 2” is lower than the specified value, the channels “city 1”, “city 2”, “city 3” The above-described location registration is transmitted again. At this time, the base station radio device 24 closest to the mobile station radio device 30 responds with the channel “city 1” (base station number is “04”, operation mode is “emergency transmission”), and the reception level is If it is equal to or greater than the specified value, the operation mode at that time is set in the mobile station radio device 30 and communication is possible.

  As described above, even when base station wireless devices with operation modes of “normal transmission” and “emergency transmission” coexist, the base station wireless device closest to the mobile station wireless device (with the highest reception level) The mobile station radio equipment operator can perform work without being aware of the operation mode and communication area of the base station radio equipment. it can.

It is a block diagram of the basic composition of the radio | wireless system of the Example of this invention. It is a flowchart of operation | movement of the base station radio | wireless apparatus of the Example of this invention. It is explanatory drawing of the return | turnback of the base station radio | wireless apparatus of the Example of this invention. It is a flowchart of operation | movement of the mobile station radio | wireless apparatus of the Example of this invention. 5 is a flowchart illustrating details of an all-channel search in FIG. 4. FIG. 5 is a flowchart of branching in FIG. 4. FIG. It is explanatory drawing of an example of operation | use. It is a block diagram of the basic composition of the conventional radio system.

Explanation of symbols

10: control station, 11: LAN, 12: command board, 13: command control device, 14: radio control table, 15: SCPC control device 20: base station radio device group, 21-25: base station radio device 30: movement Station radio equipment

Claims (6)

A control station that issues a command, a mobile station radio device, and a plurality of base station radio devices that relay communication between the control station and the mobile station radio device. A wireless system in which a base station wireless device in the “transmission” operation mode and a base station wireless device in the “emergency transmission” operation mode are mixed,
The mobile station radio device performs location registration transmission on a specific channel to the plurality of base station radio devices,
A specific base station wireless device of the plurality of base station wireless devices transmits a response signal for the location registration transmission including information on the operation mode to the mobile station wireless device on the specific channel; A featured wireless system.   The radio system according to claim 1, wherein the mobile station radio apparatus includes means for reporting information related to an operation mode transmitted from the specific base station radio apparatus.   The mobile station radio device always receives a radio wave from the specific base station radio device after receiving the response signal having the operation mode of “regular transmission”, and the reception level is a predetermined value determined in advance. 3. The wireless system according to claim 1, wherein the location registration transmission is resumed on another channel when the value is less than. A base station radio device in an operation mode of “always-on” or “emergency transmission” that relays communication between a mobile station radio device and a control station that issues a command,
A base station radio apparatus characterized in that information on the operation mode is included in a response signal to the mobile station radio apparatus in response to a location registration transmission received from the mobile station radio apparatus. A mobile station radio device relayed between a control station that issues a command via a base station radio device that operates in an operation mode of “regular transmission” or “emergency transmission”,
In addition to performing location registration transmission to the base station radio apparatus, it is possible to receive information on the operation mode in a response signal transmitted from the base station radio apparatus in response to the location registration transmission. Mobile station radio device.   6. The mobile station radio apparatus according to claim 5, further comprising means for notifying information on the operation mode.

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