JP2005101799A - Apparatus and system for radio communication - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that, since the service form of an SCPC digital communication system is a radio communication constituted of 1-channel/1-base station, when one radio communication apparatus occupies a channel, other radio communication apparatus cannot communicate with the base station, and the SCPC digital radio communication apparatus has a large power consumption at waiting time and obstructs reductions of weight and size. <P>SOLUTION: The radio communication apparatus includes the SCPC (Single Channel Per Carrier) digital radio device, a radio calling receiver and the SCPC digital radio device, and a controller for controlling the radio calling receiver. The radio calling receiver has a signal processing unit for processing a radio calling signal. The controller has a power source controller for controlling applying/interrupting of the power sources of the SCPC digital radio device and the radio calling receiver. When the signal processing unit detects the applying or interrupting of the SCPC digital radio device during the radio calling signal, the controller controls the power source of the SCPC digital radio device, and sets the SCPC digital radio device to an operating state. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a radio communication apparatus and a radio communication system, and more particularly to a radio communication apparatus and a radio communication system including an SCPC digital mobile radio apparatus and a radio paging system receiver.

  As shown in FIG. 5, a digital radio communication system that is currently in practical use includes a base station 501 and a plurality of mobile stations M1, M2, and a communication area 502 (also referred to as a communication zone) of the base station 501. ... (in the case where the mobile stations are collectively referred to as the mobile station M), or the mobile stations m1, m2, and the mobile stations m1 and m2 located outside the communication area 502. .. a system configured to perform communication connection service with. In FIG. 5, only the mobile stations M1 and m1 are shown.

  In FIG. 5, uplink and downlink radio frequencies are assigned to the base station 501 in pairs, and the transmission wave transmitted from the base station 501 is a downlink wave F1, and the transmission wave transmitted from the mobile station M1 to the base station 501. Will be referred to as upstream wave f1. Communication between the base station 501 and the mobile station M1 or between the mobile station M1 and the mobile station m1 via the base station 501 is performed using these uplink and downlink pair waves. The communication area 502 is an operation area of the base station 501. Further, the communication between the mobile station M1 and the mobile station m1 outside the communication area 502 is direct communication between the mobile stations. Such a system is one of SCPC (Single Channel Per Carrier) frequency division multiple access (FDMA), and is a method of allocating one carrier per voice channel. The frequency of the SCPC radio used is a 400 MHz band frequency, and the frequency interval between adjacent channels is, for example, 6.25 KHz. The SCPC frequency division multiple access is defined by ARIB STANDARD, and will not be described here.

  Thus, as described above, the service form of the SCPC digital system is a base station communication having a 1 channel / 1 base station configuration, for example, group communication such as simultaneous notification (hereinafter referred to as group communication) or a base station 501. Communication with one mobile station M (hereinafter referred to as “Celecall communication”) or communication between mobile stations via a base station is common. For this reason, when a specific mobile station, for example, the mobile station M1 occupies the downlink by celer call communication, another SCPC digital mobile station M is addressed to the mobile station M in the base station 501 until the mobile station M1 finishes the call. There is a drawback that cannot be called. As a result, when a specific information is reported to another mobile station M in the area 502 of the base station 501 in the event of a disaster or the like, there will be a problem if there is only one channel on the downlink, and information transmission Is very inefficient. In addition, the SCPC digital wireless communication apparatus performs intermittent reception, but the sleep time during intermittent reception cannot be lengthened due to a normal head-out problem, and power consumption cannot be reduced. Therefore, as a mobile terminal device such as a mobile station, the battery becomes large, which is an obstacle to miniaturization and weight reduction.

  As another wireless system, there is a wireless paging system (also called a paging system) that can send a short message or the like. This radio paging system is the system that covers the widest area of mobile communications. The service area of the radio paging system provides a wide range of services such as regional services by prefecture, wide area services, and multi-area services. In the service area of this radio paging system, usually one radio paging central station and a plurality of radio paging base stations are arranged. When a caller dials a call number of a radio call receiver (hereinafter referred to as a pager receiver), the caller is connected to a radio call base station in the radio call central station, and the radio call base station identifies the corresponding pager receiver. The address signal and the input message signal are transmitted to each radio paging base station. Signals sent to each radio paging base station are converted into radio signals and simultaneously transmitted simultaneously from the respective base stations at the same radio frequency. Note that the pager reception frequency band used in the paging system is the 280 MHz band, and the frequency interval between adjacent channels is, for example, 25 KHz. Therefore, since the frequency band used for the SCPC digital radio system and the pager reception frequency band used in the paging system are different, there is no possibility of mutual interference.

  If the pager receiver has its own address signal in the received selective call signal, the pager receiver sounds and decodes the message signal to display the contents. Further, the pager receiver performs intermittent reception in order to reduce power consumption. In this radio paging system, a high intermittent reception ratio is realized, and the system is very low in power consumption.

  In addition, a wireless communication device, a wireless communication system, and a communication device (for example, see Patent Document 1) describe a technique for combining a cellular system and a paging system to save power in a cellular wireless device.

JP 2002-314475 A

  The service form of the SCPC digital system is generally base station communication of 1 channel / 1 base station configuration or communication between mobile stations via a base station. For this reason, when one mobile station occupies the downlink, there is a problem that other SCPC digital mobile stations cannot make incoming calls addressed to other mobile stations in the base station until the call is terminated. In addition, the SCPC digital wireless communication apparatus performs intermittent reception, but the sleep time at the time of intermittent reception cannot be extended due to the problem of head breakage, and power consumption cannot be reduced.

  An object of the present invention is to provide a radio communication apparatus and a radio communication system in which another SCPC digital mobile terminal apparatus can receive a report from a base station even when the SCPC digital mobile terminal apparatus occupies a downlink. That is.

  Another object of the present invention is to provide a wireless communication apparatus and a wireless communication system that reduce power consumption during standby of an SCPC digital mobile portable terminal device.

  The radio communication apparatus of the present invention comprises an SCPC (Single Channel Per Carrier) digital radio, a radio call receiver, and a controller for controlling the SCPC digital radio and the radio call receiver. Has a signal processing unit for processing a radio paging signal, and the control unit includes a power control unit for controlling on / off of each power unit of the SCPC digital radio and the radio paging receiver, When the signal processing unit detects the SCPC digital radio on / off signal in the radio paging signal, the control unit controls the power unit of the SCPC digital radio to operate the SCPC digital radio. Configured to be.

  In the wireless communication apparatus of the present invention, when the SCPC digital radio is synchronized with a synchronization signal from an SCPC digital base station, the control unit is configured to hold the SCPC digital radio in a standby state. .

  In the wireless communication device of the present invention, when the control unit determines that the current position of the wireless communication device is within the service area of the wireless call receiver, the control unit shuts off the power of the SCPC digital wireless device. The wireless call receiver is configured to be controlled to be turned on.

  Further, the wireless communication system of the present invention comprises a plurality of wireless communication devices, a wireless calling base station, an SCPC digital base station, and a control station coupled to the wireless calling base station and the SCPC digital base station. Each of the at least two wireless communication devices of the plurality of wireless communication devices includes an SCPC digital wireless device, a wireless call receiver, and a controller that controls the SCPC digital wireless device and the wireless call receiver. The control station has an SCPC digital control station, a control call central station, and a storage device. The storage device stores a table in which a radio call area code and an SCPC communication area are associated with each other, and at least one of the wireless communication When the SCPC digital radio of the device is synchronized with the synchronization signal from the SCPC digital base station, the control unit It is configured to hold the C digital radio in a standby state.

  Further, in the wireless communication system of the present invention, when it is determined that the wireless communication device is in the wireless calling area based on the table, the power of the SCPC digital wireless device of the wireless communication device is shut off, and The radio call receiver is configured to be turned on.

  Further, in the radio communication system of the present invention, the radio call receiver further includes a signal processing unit for processing a radio call signal, and the control unit includes each of the SCPC digital radio device and the radio call receiver. A power control unit that controls on / off of the power supply unit, and when the signal processing unit detects an on / off signal of the SCPC digital radio in the radio call signal, the control unit The power supply unit of the radio is controlled, and the SCPC digital radio is set in an operating state.

  As described above, according to the present invention, in a SCPC digital system, even when a specific SCPC digital mobile terminal device occupies a downlink, other SCPC digital mobile terminal devices receive a report from a base station. Therefore, there is an effect of increasing the number of downlink channels. In addition, since the sleep period of the SCPC digital mobile terminal device can be extended, power consumption during standby can be greatly reduced. Further, since the contents of the pager communication message can be monitored, it is possible to grasp the message commanded through the public network inside and outside the area.

  FIG. 1 is a block diagram showing an embodiment of the present invention. 1 includes a pager receiver (also referred to as a wireless call receiver) 101, an SCPC digital radio device 102, a pager receiver 101, and a control unit 103 that controls the SCPC digital radio device 102. Has been. Details of the pager receiver 101, the SCPC digital radio device 102, and the control unit 103 will be described later. This wireless communication apparatus is configured to operate in the wireless communication system shown in FIG. 2, 201-1, 201-2,... 201-n are wireless communication devices such as the mobile terminal devices shown in FIG. Note that the wireless communication device is collectively referred to as 201. Reference numeral 202 denotes a control station. The control station 202 includes a control call central station unit 203 having a central station function of a radio paging system (paging system) and an SCPC digital control station unit 204 having a control station function in the SCPC digital system. Are coupled to each other and configured to exchange information and have a storage unit 205. The storage unit 205 will be described later. The control station 202 is connected to the public network 206. The control call central station unit 203 is connected to the radio call base station 207. The radio paging base station 207 is configured to transmit an address signal for identifying a pager receiver corresponding to the pager receiver 101 of the radio communication apparatus 201 and an input message signal. Reference numeral 208 denotes a wireless calling area. Needless to say, this wireless paging system can call the wireless communication apparatus 201 by telephone call from the public network 206 as is well known in the art. In FIG. 2, only one radio paging base station 207 is shown for simplicity, but there are many radio paging base stations because a wide range of services are provided. Needless to say.

  On the other hand, the SCPC digital control station 204 is connected to the SCPC digital base station 209. This SCPC digital base station 209 is configured to be able to transmit and receive with the SCPC digital radio 102 of the radio communication apparatus 201.

  The storage device 205 of the control station 202 is constituted by a memory such as a ROM, for example, and the telephone number of the pager receiver 101 (pager receiver number) built in the wireless communication device 201 and the telephone number of the SCPC digital wireless device 102. A correspondence table with (SCPC digital radio number) is stored as a memory table as shown in Table 1. As shown in FIG. 2, the storage device 205 can be provided in common in the control call central station unit 203 or the SCPC digital control station unit 204, or can be provided individually for each.

  The correspondence table shown in Table 1 shows a receiver number of a pair of pager receivers built in the wireless communication device 201, for example, a, b,... And a radio number of an SCPC digital wireless device, for example, x, y,... are associated with each other. For example, when calling the SCPC digital radio of the radio communication apparatus 201-2 from the pager receiver of the radio communication apparatus 201-1, or conversely, calling the pager receiver from the SCPC digital radio, see Table 1. .

  Further, the storage device 205 of the control station 202 stores a correspondence table showing a correspondence relationship between the service area of the paging system and the communication area of the SCPC digital base station as a memory table as shown in Table 2.

  Table 2 is a table in which the relationship between pager area codes A, B,... N and SCPC communication areas S1, S2,.

  Next, returning to FIG. 1, the configuration of the wireless communication apparatus 201 will be described in detail. First, the pager receiver 101 receives a radio paging signal from the radio paging base station 207 by the antenna 104. A signal received by the antenna 104 is amplified by the high frequency amplification unit 105, branched into two, and input to the frequency conversion units 106 and 107. Each frequency converter 106, 107 is supplied with a local transmission signal having a frequency equal to the carrier signal frequency from the transmitter 108 via the phase shifter 109 as a carrier signal having a phase difference of 90 degrees, and is converted into a baseband signal. The Outputs from the frequency converters 106 and 107 are input to the demodulator 114 via the filters 110 and 111 and limiters 112 and 113, respectively, and demodulated. This demodulated signal is supplied to the reception signal processing unit 115. In the reception signal processing unit 115, when the address signal of the own station is detected from the received call signal, the message signal is decoded. The decoded message signal is supplied to the control unit 103 and displayed on the display unit 122 when it is a normal received message in the paging system. Reference numeral 116 denotes a power source of the pager receiver 101, which supplies power to each part of the pager receiver 101, but details are omitted in FIG.

  Thus, a signal format used in a wireless communication apparatus in which the paging receiver 101 and the SCPC digital wireless device of the present invention are integrated will be described below with reference to FIG. FIG. 4 is a diagram showing a frame format used in the paging system. In the paging system, the transmission signal is composed of repetition of a frame period T, T is 128 frame periods (4 minutes and 0 seconds), and one frame is composed of 1.875 seconds. Fr0 is the frame number. FIG. 5 is an enlarged view of the 0th (indicated by Frame 0 in FIG. 4). One frame is composed of a synchronization signal portion (SYNC) and 11 blocks (Block 0, 1,... 10). Block 0 is composed of block information and an address field. The block information includes information such as the starting point, system variable cycle, carry-on, date, time, and each radio channel ID in the address field and vector field frames. The address field contains all address information and is located next to the block information.

  Block 1 is a vector field and contains vector information. Each vector is paired with a corresponding address, and includes the starting point, type (number, character, etc.) of the message combined with each address, and the length of the message. Block 2 to Block 8 are message data fields, which are transmission areas for message data to be transmitted. Blocks 9 and 10 are idle fields, and are composed of dummy bit patterns of 1010.

  Here, the function of turning on or off the power of the SCPC digital radio 102 using the paging system will be described. In FIG. 4, Block 2 to Block 8 have been described as areas for transmitting message data. However, in the present invention, for example, information SW for turning ON / OFF the SCPC digital radio device 102 is inserted into Block 2. For example, the ON information of the SCPC digital radio 102 is configured such that 1 bit “1” is inserted into the SW, and 1 bit “0” is inserted into the SW as the OFF information. In this description, the insertion of 1 bit into Block 2 has been described. However, it may be 2 bits or more, or may be inserted at a place other than Block 2. Further, ON / OFF information of the SCPC digital wireless device 102 can be periodically inserted at several locations so that the reception signal processing unit 115 can reliably detect the information.

  With this configuration, when the message SW instructing to turn on the power of the SCPC digital radio 102 by the pager receiver 101 is included in the paging signal of the radio paging base station 207, the received signal processing unit 115 Detects this, and the detection signal is supplied to the SCPC digital radio power supply control unit via the bus 125 of the control unit 103, and the power supply 143 of the SCPC digital radio 102 is turned on. Here, the pager receiver 101 adopts the direct conversion method as described above, but it is needless to say that it may be a superheterodyne method.

  Next, the SCPC digital radio device 102 will be described. First, a signal from the SCPC digital base station 209 is received by the antenna 126 and input to the receiving unit 128 via the antenna duplexer 127. In the receiving unit 128, after high frequency amplification by the high frequency amplification unit 129, the frequency is converted by the local transmission signal from the frequency synthesizer 133 in the reception mixer 130, and demodulated by the demodulator 132 via the intermediate frequency amplifier 131. The demodulated reception signal for the local station is signal-processed by the reception signal processing unit 135 of the baseband signal processing unit 134 and output to the receiver 136. Depending on the transmission contents, the display unit 122 may be connected via the control unit 103. Is output.

  On the other hand, the voice signal from the transmitter 137 or the input data from the control unit 103 is subjected to signal processing by the transmission signal processing unit 138 and then input to the transmission unit 139. In the transmission unit 139, the output signal of the transmission signal processing unit 138 is subjected to predetermined modulation processing by the modulator 140, and then converted to a high frequency signal by the transmission mixer 141 to which the signal from the frequency synthesizer 133 is supplied. The power is amplified by the amplifying unit 142 and then transmitted to the SCPC digital base station 209 via the antenna duplexer 127 and the antenna 126. Reference numeral 143 denotes a power source for the SCPC digital radio device 102, and the SCPC digital radio power source control unit 124 controls power on / off of the SCPC digital radio device 102. The power supply 143 supplies power to the circuits and components of each unit of the SCPC digital wireless device 102, but detailed contents are omitted here.

  In the control unit 103, the central processing unit (main CPU) 117 controls the entire wireless communication apparatus 201. A storage device (ROM) 118 stores a control program, predetermined constants, various parameters, and tables, and a RAM 119 is used as a work area. Reference numeral 120 denotes an interface for coupling the input key 121 and the display unit 122 to the bus 125. A pager receiver power control unit 123 controls the power on / off of the pager receiver 101 and controls the power source 116 of the pager receiver 101.

  The outputs of the reception signal processing unit 115 of the pager receiver 101 and the baseband signal processing unit 134 of the SCPC digital wireless device 102 are connected to each other via a bus 125. The control unit 103 controls transmission / reception sequence operations in the pager receiver 101 and the SCPC digital radio 102, modulation / demodulation of the transmission / reception control signal, control of the transmission / reception protocol, and the like. Processing for displaying information received at 102 or various information for the operator on display unit 122, processing for outputting data input from input key 121 to baseband signal processing unit 134 of SCPC digital radio 102, pager When a message instructing to turn on the power of the receiver power controller 123 and the SCPC digital radio 102 is received, the power 143 of the SCPC digital radio 102 is turned on via the SCPC digital radio power controller 124. Processing, other And controls the overall operation of the line communication device 201.

  Next, the operation of the wireless communication apparatus 201 shown in FIG. 1 will be described using FIG. First, in step 301, the SCPC digital radio 102 is turned on. For example, the input key 121 is operated to turn on the power supply 143 of the SCPC digital radio 102 via the SCPC digital radio power supply control unit 124.

  In step 302, it is determined whether or not it is synchronized with the SCPC digital base station 209. That is, when the power 143 of the SCPC digital radio 102 is turned on, the SCPC digital radio 102 starts to communicate with the SCPC digital base station 209. The SCPC digital base station 209 always transmits an empty line signal (a kind of synchronization signal) to the wireless communication apparatus 201 at an interval of 40 msec, for example. Therefore, the wireless communication apparatus 201 determines whether the SCPC digital wireless system is in or out of the area by detecting this synchronization signal. The determination of the inside / outside of the area is made by the central processing unit 117 of the control unit 103 based on whether synchronization is established or not. If YES is determined, the process proceeds to step 303 because it is within the range of the SCPC digital wireless system. On the other hand, if it is determined that it is out of the range of the SCPC digital wireless system, the process proceeds to step 308.

  In step 303, the SCPC digital system is set in a standby state, and functions similar to those of a normal SCPC digital system are executed. That is, when transmitting information from the SCPC digital radio 102 to the SCPC digital base station 209, the process proceeds to “calling” in step 304. In receiving information from the SCPC digital base station 209, “incoming call” in step 305 is set. The process proceeds to the communication state of step 306. When the communication is completed (step 307), the process proceeds to step 308. If no “call” or “call” is generated for a predetermined period, for example, for a few seconds, the communication path is disconnected and the process proceeds to step 307. This predetermined period can be set as appropriate using, for example, a built-in timer.

  In step 308, it is determined whether the pager is within the service area. Whether the pager is within the service area is determined by referring to the memory table shown in Table 2 stored in the storage device 205 of the control station 202 described above. That is, in Table 2, the area code B of the pager corresponds to the communication area S1 of the SCPC, but there is nothing corresponding to the area code of the pager to the communication area S2 of the SCPC. That is, as apparent from Table 2, the pager service area and the SCPC communication area overlap, and the pager service area only and the SCPC communication area only are classified into three types. Accordingly, when the current position of the wireless communication apparatus 201 is not the pager service area (NO), the process returns to step 302 and proceeds to the determination step of whether it is the SCPC digital wireless service area. On the other hand, in the case of the pager service area (YES), the process proceeds to step 309.

  In step 309, pager area registration is performed. In other words, the pager receiver 101 has an information reception function but no information transmission function. Therefore, this area registration is performed via the SCPC digital radio device 102. That is, the control unit 103 of the wireless communication apparatus 201 supplies a pager service area registration signal for the wireless calling central station unit 203 to the baseband signal processing unit 134 of the SCPC digital wireless device 102, and passes through the SCPC digital wireless device 102. Send. The SCPC digital base station 209 receives this area registration signal and sends it to the SCPC digital control station 204. This area registration signal is notified from the SCPC digital control station 204 to the radio paging central station section 203. In this way, area registration of the paging system is automatically performed via the SCPC system, and the process proceeds to step 310.

  In step 310, the power supply 116 of the pager receiver 101 is turned on. That is, the pager receiver power control unit 123 of the control unit 103 turns on the power 116 of the pager receiver 101 to put the pager receiver 101 into an operating state, and the process proceeds to Step 311.

  In step 311, the power supply 143 of the SCPC digital radio 102 is turned off under the control of the SCPC digital radio power supply control unit 124, and the operation of the SCPC digital radio 102 is suspended.

  Step 312 is a standby state of the paging system. That is, the SCPC digital wireless device 102 is in a dormant state, but the pager receiver 101 is in an operating state. However, as described above, the paging system is in a standby state in which a high intermittent reception ratio is realized and the power consumption is very low, so that the system consumes very little power.

  In step 312, when a call is made via the paging system in the standby state of the paging system, the process proceeds to step 313, and the type of the call (message type) is determined. That is, in the pager receiver 101, the received signal processing unit 115 processes the type of message to be sent, and when it is a normal paging service call, it proceeds to step 314 to receive the normal paging service. Upon completion of service reception (step 315), the process returns to step 312 to enter the paging system standby state.

  On the other hand, as a result of processing the message type by the received signal processing unit 115, when the power ON signal SW of the SCPC digital radio 102 shown in FIG. 4 is detected, the power ON signal SW is sent via the bus 125 to the SCPC digital radio. The power is sent to the power control unit 124 and controlled to turn on the power 143 of the SCPC digital radio 102 (step 301).

  As a result, the power of the SCPC digital radio is turned on (step 301), synchronized with the SCPC digital base station 209 (step 302), and when calling to the SCPC digital radio 102, the SCPC digital radio is received. The system shifts to standby (step 303), receives a call signal for itself (step 305), and performs communication (step 306). After the end of communication (step 307), the process returns to the determination (step 308) of whether or not the service area is within the paging system. The above operation is repeated.

  The present invention has been described in detail above. However, in the case where the present invention is a communication area of an SCPC digital system and a communication area of a paging system, for example, the wireless communication apparatus 201-1 is an SCPC digital system and an SCPC digital base station 209. The other wireless communication devices 201-2, 201-3,... Are in a standby state by the paging system even during a call, so in the event of an emergency, the wireless call base station 207 is transferred from the control station 202. The emergency information can be transmitted to the wireless communication devices 201-2, 201-3,. As a result, even if the wireless communication device 201-1 is busy and occupies the channel of the SCPC wireless system, an urgent message from the control station 202 is sent to the other wireless communication devices 201-2, 201-3,. .. can communicate, and if necessary, the message content can be displayed on the display device.

  The wireless communication apparatus of the present invention operates as a pager system when the current position of the apparatus is within the communication area of the pager system and outside the communication area for the SCPC digital wireless system, and within the communication area of the SCPC digital wireless system. Of course, it operates as an SCPC digital radio system outside the communication area of the pager system.

  Therefore, the service form of the SCPC digital system can solve the problem that only one wireless communication apparatus 201-1 can communicate with each other in base station communication of 1 channel / 1 base station configuration.

  Further, in the SCPC digital radio apparatus of the present invention, when the power is turned on and the mobile phone is located in the area of the paging system, the area registration is performed with respect to the paging system, and the power of the SCPC digital radio is cut off to receive the pager. Only the machine is operated, and the standby operation of the SCPC digital system is replaced by the standby of the paging system. Therefore, power consumption during standby of the wireless communication device can be greatly reduced.

  Although the present invention has been described in detail above, the present invention is not limited to the wireless communication device and the wireless communication system described herein, and can be widely applied to wireless communication devices and wireless communication systems other than those described above. Needless to say, you can.

It is a block diagram which shows schematic structure of one Example of this invention. It is a figure for demonstrating the communication system used for this invention. It is a figure for demonstrating operation | movement of this invention. It is a figure for demonstrating the frame format of the paging system which this invention uses. It is a figure for demonstrating the conventional SCPC digital radio | wireless communications system.

Explanation of symbols

101: Pager receiver, 102: SCPC digital radio, 103: Controller, 104, 126: Antenna, 105: High frequency amplifier, 106, 107: Frequency converter, 108: Transmitter, 109: Phaser, 110, 111 : Filter, 112, 113: Limiter, 114, 132: Demodulator, 115: Received signal processing unit, 116: Power supply of pager receiver, 117: Central processing unit, 118: ROM, 119: RAM, 120: Interface, 121 : Input key, 122: display unit, 123: pager receiver power control unit, 124: SCPC digital radio power control unit, 125: bus, 127: antenna duplexer, 128: reception unit, 129: high frequency amplification unit, 130 : Reception mixer, 131: IF amplifier, 133: frequency synthesizer, 134: baseband Signal processing unit, 135: reception signal processing unit, 136: receiver, 137: transmitter, 138: transmission signal processing unit, 139: transmission unit, 140: modulator, 141: transmission mixer, 142: transmission power amplifier, 143 : Power source of SCPC digital radio 201: radio communication device 202: control station 203: control call central station section 204: SCPC digital control station 205: storage section 206: public network 207: radio call base station 208: Radio paging area, 209: SCPC digital base station.

Claims (1)

An SCPC (Single Channel Per Carrier) digital radio, a radio call receiver, and a controller that controls the SCPC digital radio and the radio call receiver. The radio call receiver processes a radio call signal. A signal processing unit, and the control unit includes a power control unit that controls power on / off of each of the SCPC digital radio device and the radio call receiver, and the signal processing unit includes the radio call signal. When the SCPC digital radio on / off signal is detected, the control unit controls the power supply unit of the SCPC digital radio to put the SCPC digital radio into an operating state. Communication device.

Images