JP2005286970A - Radio base station apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio base station apparatus capable of preventing undesired electronic wave being transmitted even when a trouble occurs and maintaining an operation. <P>SOLUTION: The radio base station apparatus 1A comprises a plurality of active radio transmitting units 131A to 131C and a spare radio transmitting unit 131X for transmitting a base band signal after converting to a radio frequency signal, a transmission shut down processing unit 114 for outputting a radio transmission shut down indication to one of the active radio transmission units 131A to 131C which are under transmission in radio, a transmission start processing unit 115 for outputting radio transmission starting indication to the spare radio transmission unit 131X which is under waiting, a transmission switching unit 133 for performing an operation switch from one of the plurality of the active radio transmitting unit 131A to 131C to the spare radio transmission unit 131X, and a control managing unit 111 for performing an operation control of the transmitting shut down processing unit 114, the transmission start processing unit 115, and the transmission switching unit 133. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a radio base station apparatus in a mobile communication system.

  As a technique related to radio transmission control of a radio base station apparatus that has been conventionally used, there is a technique disclosed in Patent Document 1, for example.

  Conventionally, in a radio base station apparatus, it has been a problem that unnecessary radio waves are transmitted due to a failure of a radio transmission unit, and it is allowed to transmit a radio signal of the same frequency from the radio transmission unit in an overlapping manner. It has not been. Therefore, a radio base station apparatus generally has a function of monitoring an abnormal state of a radio transmission unit by a host apparatus and stopping radio transmission when an abnormality is detected.

JP 2000-102054 A

  However, in the above technique, it is possible to stop wireless transmission and prevent unnecessary radio waves from being transmitted, but the operation as a wireless base station apparatus cannot be continued. In a radio base station apparatus of a mobile communication system, even when a failure occurs, it is required to continue the operation after separating the location where the failure has occurred from the operation.

  In addition, when a location disconnected from the operation due to a failure is restored, it is necessary to restore the original state as quickly as possible and continue the operation in the normal device state.

  In addition, depending on the failure level of the wireless transmission unit, it may be impossible to perform normal state monitoring by the host device. Even in such a case, it is necessary to reliably stop the wireless transmission and prevent the wireless signal having the same frequency from being transmitted.

  The present invention has been made in view of such circumstances, and provides a radio base station apparatus that can prevent unnecessary radio waves from being transmitted and can continue operation even when a failure occurs. For the purpose. It is another object of the present invention to provide a radio base station apparatus that can quickly return to its original state and continue operation in a normal apparatus state when a failure is recovered. It is another object of the present invention to provide a radio base station apparatus that can reliably stop radio transmission even when a failure that cannot be detected by normal state monitoring occurs.

  The radio base station apparatus of the present invention includes a plurality of active radio transmission units and one standby radio transmission unit that convert a baseband signal into a radio frequency signal and transmit it, and the plurality of active radio transmissions during radio transmission. A transmission stop processing unit that outputs a wireless transmission stop instruction to one of the units; a transmission start processing unit that outputs a wireless transmission start instruction to the standby wireless transmission unit that is in operation standby; and A transmission switching unit that switches operation from one of the active wireless transmission units to the standby wireless transmission unit, a control management unit that performs operation control of the transmission stop processing unit, transmission start processing unit, and transmission switching unit; It is equipped with.

  According to this configuration, a wireless transmission stop instruction is given to one of a plurality of active wireless transmission parts being wirelessly transmitted, and a wireless transmission start instruction is given to a standby wireless transmission part that is waiting for operation. Even when a failure occurs, it is possible to prevent unnecessary radio waves from being transmitted, and to continue the operation by separating the location where the failure has occurred from the operation.

  The radio base station apparatus of the present invention, when one of the plurality of active radio transmission units is restored, the transmission stop processing unit stops radio transmission to the standby radio transmission unit that is performing radio transmission Outputs an instruction, the transmission switching unit performs operation switching from the standby radio transmission unit to one of the restored plurality of active radio transmission units, and the transmission start processing unit performs the restored plurality of active This includes outputting a wireless transmission start instruction to one of the system wireless transmission units.

  According to this configuration, a wireless transmission stop instruction is given to the standby wireless transmission part that is wirelessly transmitting, and a wireless transmission start instruction is given to one of the restored plurality of active wireless transmission parts. When the failure is recovered, it can be quickly returned to the original state and can continue to operate in the normal apparatus state.

  A radio base station apparatus according to the present invention includes a plurality of active radio receivers that convert a radio frequency signal into a baseband signal, a spare radio receiver, and a plurality of active radio receivers that are performing radio reception. A reception stop processing unit that outputs a radio reception stop instruction to one, a reception start processing unit that outputs a radio reception start instruction to the standby radio reception unit waiting for operation, and the plurality of active radios A reception switching unit that switches operation from one of the reception units to the standby radio reception unit, and a control management unit that performs operation control of the reception stop processing unit, the reception start processing unit, and the reception switching unit. ing.

  According to this configuration, a radio reception stop instruction is given to one of a plurality of active radio reception units receiving radio, and a radio reception start instruction is given to a standby radio reception unit waiting for operation. Even when a failure occurs, reception of unnecessary radio waves can be prevented, and the operation can be continued by separating the location where the failure occurred from the operation.

  In the radio base station apparatus of the present invention, when one of the plurality of active radio reception units is restored, the reception stop processing unit stops radio reception with respect to the standby radio reception unit receiving radio Outputs an instruction, the reception switching unit performs operation switching from the standby radio receiving unit to one of the restored active radio receiving units, and the reception start processing unit is configured to restore the restored active This includes outputting a radio reception start instruction to one of the system radio reception units.

  According to this configuration, a radio reception stop instruction is given to the standby radio reception unit that is performing radio reception, and a radio reception start instruction is given to one of the restored plurality of active radio reception units. When the failure is recovered, it can be quickly returned to the original state and can continue to operate in the normal apparatus state.

  The radio base station apparatus of the present invention includes a plurality of active radio transmission units and one standby radio transmission unit that convert a baseband signal into a radio frequency signal and transmit it, and the plurality of active radio transmissions during radio transmission. A transmission stop processing unit that outputs a wireless transmission stop instruction to one of the units; a transmission start processing unit that outputs a wireless transmission start instruction to the standby wireless transmission unit that is in operation standby; and A transmission switching unit that switches operation from one of the active wireless transmission units to the standby wireless transmission unit, a plurality of active wireless reception units that convert a radio frequency signal into a baseband signal, and one standby wireless Wireless to a reception unit, a reception stop processing unit that outputs a radio reception stop instruction to one of the plurality of active radio reception units that are receiving radio, and the standby radio reception unit that is in operation standby A reception start instruction is output. A start processing unit, a reception switching unit that switches operation from one of the plurality of active wireless reception units to the standby wireless reception unit, the transmission stop processing unit, a transmission start processing unit, a transmission switching unit, A control management unit that performs operation control of the reception stop processing unit, the reception start processing unit, and the reception switching unit.

  According to this configuration, a wireless transmission stop instruction is given to one of a plurality of active wireless transmission parts being wirelessly transmitted, and a wireless transmission start instruction is given to a standby wireless transmission part that is waiting for operation. Even when a failure occurs, it is possible to prevent unnecessary radio waves from being transmitted, and to continue the operation by separating the location where the failure has occurred from the operation. Also, a failure occurs because a radio reception stop instruction is given to one of a plurality of active radio reception units that are receiving radio, and a radio reception start instruction is given to a standby radio reception unit that is waiting for operation. Even in such a case, reception of unnecessary radio waves can be prevented, and the operation can be continued by separating the location where the failure has occurred from the operation.

  The radio base station apparatus of the present invention, when one of the plurality of active radio transmission units is restored, the transmission stop processing unit stops radio transmission to the standby radio transmission unit that is performing radio transmission Outputs an instruction, the transmission switching unit performs operation switching from the standby radio transmission unit to one of the restored plurality of active radio transmission units, and the transmission start processing unit performs the restored plurality of active A wireless transmission start instruction is output to one of the system wireless transmission units, and when one of the plurality of active wireless reception units is restored, the reception stop processing unit A radio reception stop instruction is output to the system radio reception unit, and the reception switching unit performs operation switching from the standby radio reception unit to one of the restored plurality of active radio reception units, and the reception A plurality of active radio receivers whose start processing units have been restored For one of the out including those which outputs a radio reception start instruction.

  According to this configuration, a wireless transmission stop instruction is given to the standby wireless transmission part that is wirelessly transmitting, and a wireless transmission start instruction is given to one of the restored plurality of active wireless transmission parts. When the failure is recovered, it can be quickly returned to the original state and can continue to operate in the normal apparatus state. In addition, a radio reception stop instruction is given to the standby radio reception unit that is performing radio reception, and a radio reception start instruction is given to one of the restored plurality of active radio reception units. It is possible to quickly return to the original state and continue the operation in the normal apparatus state.

  The radio base station apparatus of the present invention includes a plurality of active radio transmission units and one standby radio transmission unit that convert a baseband signal into a radio frequency signal and transmit it, and the plurality of active radio transmissions during radio transmission. A transmission stop processing unit that outputs a wireless transmission stop instruction to one of the units; a transmission start processing unit that outputs a wireless transmission start instruction to the standby wireless transmission unit that is in operation standby; and Sending health check signals to a transmission switching unit for switching operation from one of the active wireless transmission units to the standby wireless transmission unit, and to the plurality of active wireless transmission units and the standby wireless transmission unit A health check processing unit that performs a forced transmission stop instruction to the standby wireless transmission unit when there is a wireless transmission unit that does not respond to the health check signal for a certain period of time, and the transmission A control processing unit that performs operation control of a stop processing unit, a transmission start processing unit, a transmission switching unit, a health check processing unit, and a forced stop processing unit, and the standby wireless transmission unit that has received the forced transmission stop instruction is The wireless transmission of the wireless transmission unit having no response is forcibly stopped.

  According to this configuration, a health check signal is transmitted to a plurality of active wireless transmission units and a standby wireless transmission unit, and a standby wireless transmission is performed when there is a wireless transmission unit that does not respond to the health check signal for a certain period of time. Since the standby wireless transmission unit that has received the forced transmission stop instruction forcibly stops the wireless transmission of the wireless transmission unit that does not respond, this is detected in normal state monitoring. Even when a failure that cannot be performed occurs, wireless transmission can be reliably stopped.

  A radio base station apparatus according to the present invention includes a plurality of active radio receivers that convert a radio frequency signal into a baseband signal, a spare radio receiver, and a plurality of active radio receivers that are performing radio reception. A reception stop processing unit that outputs a radio reception stop instruction to one, a reception start processing unit that outputs a radio reception start instruction to the standby radio reception unit waiting for operation, and the plurality of active radios A reception switching unit that switches operation from one of the reception units to the standby radio reception unit, and a health check that sends a health check signal to the plurality of active radio reception units and the standby radio reception unit A processing unit, a forcible stop processing unit that outputs a forcible reception stop instruction to the standby radio receiving unit when there is a radio receiving unit that does not respond to the health check signal for a certain period of time, and the reception stop processing A control management unit that performs operation control of a reception start processing unit, a reception switching unit, a health check processing unit, and a forced stop processing unit, and the standby radio reception unit that has received the forced reception stop instruction is the response Forcibly stops wireless reception of the wireless receiving unit without any.

  According to this configuration, the health check signal is transmitted to the plurality of active radio reception units and the standby radio reception unit, and the standby radio reception is performed when there is a radio reception unit that does not respond to the health check signal for a certain period of time. Since the standby radio reception unit that has received the forced reception stop instruction forcibly stops the radio reception of the wireless reception unit that does not respond, this is detected in normal state monitoring. Even when a failure that cannot be performed occurs, wireless reception can be reliably stopped.

  According to the radio base station apparatus of the present invention, a radio transmission stop instruction is given to one of a plurality of active radio transmission units currently performing radio transmission, and radio transmission is performed to a standby radio transmission unit waiting for operation. Since the start instruction is given, transmission of unnecessary radio waves can be prevented even when a failure occurs, and the operation can be continued by separating the location where the failure has occurred from the operation. In addition, a radio transmission stop instruction is given to the standby radio transmission section that is performing radio transmission, and a radio transmission start instruction is given to one of the restored active wireless transmission sections that are in operation standby. When the failure is recovered, it can be quickly returned to the original state and can continue to operate in the normal apparatus state. Furthermore, a health check signal is transmitted to a plurality of active wireless transmission units and a standby wireless transmission unit, and when there is a wireless transmission unit that does not respond to the health check signal for a certain period, the standby wireless transmission unit The standby wireless transmission unit that gives a forced transmission stop instruction and receives the forced transmission stop instruction forcibly stops the wireless transmission of the wireless transmission unit that does not respond, so there is a failure that cannot be detected by normal state monitoring. Even if it occurs, wireless transmission can be stopped reliably.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a schematic configuration of a radio base station apparatus according to Embodiment 1 of the present invention. In FIG. 1, the radio base station apparatus 1A according to the present embodiment converts data from the wired network 121 into a data format suitable for the interface on the radio side, and exists in the radio area in charge of the radio base station apparatus 1A. A radio frequency signal is transmitted via the antenna 2 to the mobile device. Also, data from a mobile device carried at a radio frequency is received via the antenna 2, converted into a data format suitable for the wired interface, and sent to the wired network 121.

  The radio base station apparatus 1A includes a monitoring control function unit 11A, a baseband signal processing unit 12, and a radio transmission function unit 13. The monitoring control function unit 11A collects and monitors the state of each function unit in the radio base station apparatus 1A, and controls each function unit according to the state, and includes a control management unit 111 and a state storage unit 112. A status acquisition unit 113, a transmission stop processing unit 114, and a transmission start processing unit 115. The control management unit 111 acquires the state of each functional unit in the radio base station device 1A from the state storage unit 112 in which the state of each functional unit in the radio base station device 1A collected by the state acquisition unit 113 is accumulated. It controls the operation of the transmission stop processing unit 114, the transmission start processing unit 115, and a transmission switching unit 133 described later. The transmission stop processing unit 114 outputs a wireless transmission stop instruction to one of a plurality of active wireless transmission units 131A to 131C and a standby wireless transmission unit 131X, which will be described later. The transmission start processing unit 115 outputs a wireless transmission start instruction to one of the plurality of active wireless transmission units 131A to 131C and the standby wireless transmission unit 131X.

  The baseband signal processing unit 12 performs baseband spreading processing on data from the wired network 121. The wireless transmission function unit 13 has a function of receiving a baseband signal from the baseband signal processing unit 12 and wirelessly transmitting it. The active wireless transmission units 131A to 131C, the standby wireless transmission unit 131X, Amplifying units 132A to 132C and a transmission switching unit 133 are provided. The active radio transmission units 131A to 131C and the standby radio transmission unit 131X convert baseband signals into radio frequency signals. The wireless amplification units 132 </ b> A to 132 </ b> C amplify the radio frequency signal and send it to the antenna 2. The transmission switching unit 133 performs operation switching from one of the active wireless transmission units 131A to 131C to the standby wireless transmission unit 131X. The wireless transmission units 131A to 131C and 131X have a redundant configuration, so that it is possible to avoid service interruption by switching the operation to the standby wireless transmission unit 131X that is standing by when a failure occurs.

  Next, the operation for stopping the transmission of radio signals will be described. Originally, when a failure occurs in the active wireless transmission units 131A to 131C when the wireless signal is transmitted, the active wireless transmission units 131A to 131C autonomously detect their own failure and transmit their own wireless transmission. The operation is stopped and the operation is switched to the standby wireless transmission unit 131X.

  On the other hand, in order to upgrade the functional units including the wireless transmission units 131A to 131C, the functional units may need to be disconnected from the operation. In this case, the control management unit 111 receives an instruction to disconnect from the operation from a higher-level device (not shown) of the radio base station device 1A. In accordance with the instruction, the control management unit 111 performs block processing of the wireless transmission unit to be disconnected from the operation among the wireless transmission units 131A to 131C. The blocking process is a process for waiting for the end of the use of the radio resource to which the connection is currently established, and thereafter preventing the resource of the radio transmission unit from being used. During the blocking process, the wireless transmission unit transitions to the pre-blocking state, but this pre-blocking state continues until the handover of the wireless resource to the standby standby wireless transmission unit 131X (card) is completed. The end of use of radio resources cannot be detected by itself. For this reason, it is necessary to monitor the states of the active wireless transmission units 131A to 131C and the standby wireless transmission unit 131X by the monitoring control function unit 11A and explicitly issue a wireless transmission stop instruction to the wireless transmission function unit 13. is there.

  Here, a case where the first wireless transmission unit 131A needs to be disconnected from the operation will be described as an example. The state acquisition unit 113 periodically monitors the states of the first to third wireless transmission units 131A to 131C and stores the states in the state storage unit 112. The acquisition of the state may be reported asynchronously to the monitoring control function unit 11A when the state of the wireless transmission unit changes. Moreover, you may acquire from the state acquisition part 113 irregularly as needed.

  It is assumed that the control management unit 111 receives a block instruction for the first wireless transmission unit 131A from a higher-level device (not shown). The control management unit 111 sends a block instruction to the first wireless sending unit 131A. In accordance with the block instruction, the radio transmission unit 131A sets its own state to the pre-block state, and waits until the use of the radio resource being used is completed. The state acquisition unit 113 detects the blocking state of the wireless transmission unit 131A and stores it in the state storage unit 112.

  The control management unit 111 updates the information regarding the radio resource of the first radio transmission unit 131A, and confirms the state of the standby radio transmission unit 131X at the same time. If the standby radio transmission unit 131X is in a state where the radio resource is not used, it is determined that switching to the standby radio transmission unit 131X is possible. When the state of the standby radio transmission unit 131X is in use of radio resources, it is determined that switching to the standby radio transmission unit 131X is impossible, and the switching process is not performed.

  If it is determined that switching to the standby wireless transmission unit 131X is possible, the control management unit 111 sends a wireless transmission stop instruction to the first wireless transmission unit 131A to the transmission stop processing unit 114. In response to the instruction, the wireless stop processing unit 114 transmits a wireless transmission stop instruction to the first wireless transmission unit 131A. At this stage, the first wireless transmission unit 131A stops transmitting the wireless signal.

  The control management unit 111 that has detected the stop of transmission of the wireless signal transmits a wireless transmission switching instruction to the transmission switching unit 133 in the wireless transmission function unit 13. Upon receiving the switching instruction, the transmission switching unit 133 switches the wireless transmission path connected to the first wireless transmission unit 131A to the connection to the standby wireless transmission unit 131X.

  When the switching to the standby radio transmission unit 131X is completed, the control management unit 111 sends a radio transmission start instruction to the standby radio transmission unit 131X to the transmission start processing unit 115. Upon receiving the instruction, the wireless start processing unit 115 transmits a wireless transmission start instruction to the standby wireless transmission unit 131X. At this stage, the standby wireless transmission unit 131X starts transmitting wireless signals.

  As described above, when disconnecting from the operation of the active wireless transmission unit according to an instruction from a higher-level device or the like, the operation can be continued without transmitting unnecessary radio waves twice.

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described with reference to FIG. Also in the second embodiment, the radio base station apparatus 1A has the same configuration as that of the first embodiment. The state acquisition unit 113 periodically monitors the states of the first to third wireless transmission units 131A to 131C and stores the states in the state storage unit 112. The acquisition of the state may be reported asynchronously to the monitoring control function unit 11A when the state of the wireless transmission unit changes. Moreover, you may acquire from the state acquisition part 113 irregularly as needed.

  When the first wireless transmission unit 131A is realized by, for example, one function card, the card is removed from the operation by the processing of the first embodiment described above, and then the card is removed and a new card is inserted. As a result, the functional unit may be exchanged. It is also conceivable that the functional unit is released from the closed state after being disconnected from the operation by the above-described processing of the first embodiment by a host device (not shown). Here, the present embodiment will be described by taking as an example the case where first wireless transmission unit 131A is replaced.

  After the exchange of the first wireless transmission unit 131A is performed, the new first wireless transmission unit 131A autonomously performs activation processing. After the activation, the first wireless transmission unit 131A is ready for operation.

  As described above, since the state acquisition unit 113 periodically acquires the state of the wireless transmission unit, the state acquisition unit 113 detects the operable state of the first wireless transmission unit 131A and stores the state in the state storage unit 112.

  The control management unit 111 confirms the operational status of the first wireless transmission unit 131A from the state storage unit 112, updates the information about the radio resource to the first wireless transmission unit 131A, and simultaneously transmits the standby wireless transmission. It is determined whether or not the wireless signal transmitted by the unit 131X matches the wireless signal handled by the first wireless transmission unit 131A. If they match, it is determined that the standby wireless transmission unit 131X can switch back to the first wireless transmission unit 131A. If they do not match, it is determined that one of the other wireless transmission units 131B to 131C is transmitting a wireless signal, and no switch back is performed.

  When determining that switching back to the first wireless transmission unit 131A is possible, the control management unit 111 transmits a wireless transmission stop instruction to the standby wireless transmission unit 131X to the transmission stop processing unit 114. In response to the instruction, the transmission stop processing unit 114 transmits a wireless transmission stop instruction to the standby wireless transmission unit 131X. At this stage, the standby wireless transmission unit 131X stops transmitting wireless signals.

  The control management unit 111 that has detected the stop of transmission of the wireless signal transmits a wireless transmission switchback instruction to the transmission switching unit 133 in the wireless transmission function unit 13. Upon receiving the switchback instruction, the transmission switching unit 133 switches the wireless transmission path connected to the standby wireless transmission unit 131X to the connection to the first wireless transmission unit.

  When the switch back to the first wireless transmission unit 131A is completed, the control management unit 111 sends a wireless transmission start instruction to the first wireless transmission unit 131A to the transmission start processing unit 115. Upon receiving the instruction, the transmission start processing unit 115 transmits a wireless transmission start instruction to the first wireless transmission unit 131A. At this stage, the first wireless transmission unit 131A starts transmitting a wireless signal.

  As described above, after disconnecting from the operation of the wireless transmission unit, the recovery of the wireless transmission unit is detected and the wireless signal transmitted from the standby wireless transmission unit is switched back to be transmitted from the normal wireless transmission unit. Is possible. In this way, even when the wireless function unit is restored, it is possible to continue operation without sending unnecessary radio waves twice, and the standby wireless transmission unit may be faulty in other operational wireless transmission units, etc. It is possible to wait for the occurrence of

(Embodiment 3)
Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 2 is a block diagram showing a schematic configuration of the radio base station apparatus according to Embodiment 3 of the present invention. In FIG. 2, the radio base station apparatus 1B according to the present embodiment receives data from a mobile device carried at a radio frequency via an antenna 2, converts the data into a data format suitable for a wired interface, It is sent to the line network 121.

  The radio base station apparatus 1B includes a monitoring control function unit 11B, a baseband signal processing unit 12, and a radio reception function unit 14. The monitoring control function unit 11B collects and monitors the state of each function unit in the radio base station apparatus 1B, and controls each function unit according to the state, and includes a control management unit 111 and a state storage unit 112. A status acquisition unit 113, a reception stop processing unit 116, and a reception start processing unit 117. The control management unit 111 acquires the state of each functional unit in the radio base station device 1B from the state storage unit 112 in which the state of each functional unit in the radio base station device 1B collected by the state acquisition unit 113 is accumulated. The operation control of the reception stop processing unit 116, the reception start processing unit 117, and the reception switching unit 143 described later is performed. The reception stop processing unit 116 outputs a wireless reception stop instruction to one of a plurality of working wireless reception units 141A to 141C and a standby wireless reception unit 141X described later. The reception start processing unit 117 outputs a radio reception start instruction to one of the plurality of active radio reception units 141A to 141C and the standby radio reception unit 141X.

  The baseband signal processing unit 12 performs baseband despreading processing on data from the wireless reception function unit 14. The radio reception function unit 14 has a function of receiving a radio signal from the antenna 2 and transmitting it as a baseband signal. The active radio reception units 141A to 141C, the standby radio reception unit 141X, and a reception switching unit 143. The active radio receiving units 141A to 141C and the standby radio receiving unit 141X convert radio frequency signals into baseband signals. The reception switching unit 143 performs operation switching from one of the active wireless reception units 141A to 141C to the standby wireless reception unit 141X. By adopting a redundant configuration, the wireless reception function unit 14 can avoid interruption of service by switching the operation to the standby wireless reception unit 141X that is waiting when a failure occurs.

  Next, the operation of stopping reception of radio signals will be described. Originally, when a failure occurs in the active wireless receivers 141A to 141C during reception of a radio signal, the active wireless receivers 141A to 141C autonomously detect their own failures and receive their own wireless reception. Stop and switch the operation to the standby radio reception unit 141X.

  On the other hand, in order to upgrade the functional units including the wireless receiving units 141A to 141C, the functional units may need to be disconnected from the operation. In this case, the control management unit 111 receives an instruction to disconnect from the operation from an upper device (not shown) of the radio base station device 1B. In accordance with the instruction, the control management unit 111 performs a blocking process on the wireless reception unit to be disconnected from the operation among the wireless reception units 141A to 141C. The blocking process is a process for waiting for the end of the use of the radio resource to which the connection is currently established, and thereafter preventing the use of the resource of the radio reception unit. During the blocking process, the wireless reception unit transitions to the pre-blocking state, but this pre-blocking state continues until the handover of the wireless resource to the standby standby wireless reception unit 141X (card) is completed. The end of use of radio resources cannot be detected by itself. For this reason, the monitoring control function unit 11B needs to monitor the states of the active wireless reception units 141A to 141C and the standby wireless reception unit 141X, and explicitly issue a wireless reception stop instruction to the wireless reception function unit 14. is there.

  Here, a case where the first wireless reception unit 141A needs to be disconnected from the operation will be described as an example. The status acquisition unit 113 also monitors the status of the radio reception units 141A to 141C in the same manner as the status of the radio transmission units 131A to 131C in the first embodiment.

  It is assumed that the control management unit 111 receives a blocking instruction for the first wireless reception unit 141A from the higher-level device. The control management unit 111 sends a block instruction to the first wireless reception unit 141A. In accordance with the block instruction, the radio reception unit 141A sets its own state to the pre-block state, and waits until the use of the used radio resource is completed. The state acquisition unit 113 detects the blocking state of the wireless reception unit 141A and stores it in the state storage unit 112.

  The control management unit 111 updates the information regarding the radio resource of the first radio reception unit 141A, and confirms the state of the standby radio reception unit 141X at the same time. When the state of the standby radio reception unit 141X indicates that the radio resource is not used, it is determined that switching to the standby radio reception unit 141X is possible. If the state of the standby radio receiving unit 141X is using radio resources, it is determined that switching to the standby radio receiving unit 141X is impossible, and the switching process is not performed.

  When determining that switching to the standby radio reception unit 141X is possible, the control management unit 111 sends a radio reception stop instruction to the first radio reception unit 141A to the reception stop processing unit 116. The reception stop processing unit 116 receives the instruction and sends out a wireless reception stop instruction to the first wireless reception unit 141A. At this stage, the first wireless reception unit 141A stops receiving wireless signals.

  The control management unit 111 that has detected the reception stop of the wireless signal sends a wireless reception switching instruction to the reception switching unit 143 in the wireless reception function unit 14. The reception switching unit 143 that has received the switching instruction switches the wireless reception path connected to the first wireless reception unit 141A to the connection to the standby wireless reception unit 141X.

  When the switching to the standby radio reception unit 141X is completed, the control management unit 111 sends a radio reception start instruction to the standby radio reception unit 141X to the reception start processing unit 117. The reception start processing unit 117 receives the instruction and sends out a wireless reception start instruction to the standby wireless reception unit 141X. At this stage, the standby radio reception unit 141X starts radio reception.

  As described above, when disconnecting from the operation of the active wireless reception unit according to an instruction from a higher-level device or the like, the operation can be continued without receiving the same radio frequency twice.

(Embodiment 4)
Next, Embodiment 4 of the present invention will be described with reference to FIG. Also in the fourth embodiment, the radio base station apparatus 1B has the same configuration as that of the third embodiment. The state acquisition unit 113 periodically monitors the states of the first to third wireless reception units 141A to 141C and stores the state in the state storage unit 112. The acquisition of the state may be reported asynchronously to the monitoring control function unit 11B when the state of the wireless reception unit changes. Moreover, you may acquire from the state acquisition part 113 irregularly as needed.

  When the first wireless reception unit 141A is realized by, for example, one function card, the card is removed from the operation by the processing of the above-described third embodiment, and then the card is removed and a new card is inserted. As a result, the functional unit may be exchanged. It is also conceivable that the functional unit is released from the closed state after being disconnected from the operation by the above-described processing of the third embodiment by a host device (not shown). Here, the present embodiment will be described by taking as an example the case where first radio reception unit 141A is exchanged.

  After the exchange of the first wireless reception unit 141A is performed, the new first wireless reception unit 141A autonomously performs activation processing. After the activation, the first wireless reception unit 141A is in an operable state.

  As described above, since the state acquisition unit 113 periodically acquires the state of the wireless reception unit, the state acquisition unit 113 detects the operable state of the first wireless reception unit 141A and stores the state in the state storage unit 112.

  The control management unit 111 confirms the operational status of the first radio reception unit 141A from the state storage unit 112, updates information about radio resources to the first radio reception unit 141A, and simultaneously performs standby radio reception. It is determined whether the radio signal received by the unit 141X matches the radio signal handled by the first radio reception unit 141A. If they match, it is determined that the standby radio reception unit 141X can switch back to the first radio reception unit 141A. If they do not match, it is determined that one of the other radio reception units 141B to 141C is receiving a radio signal, and no switch back is performed.

  If it is determined that switching back to the first radio reception unit 141A is possible, the control management unit 111 sends a radio reception stop instruction to the standby radio reception unit 141X to the reception stop processing unit 116. The reception stop processing unit 116 receives the instruction and sends a wireless reception stop instruction to the standby wireless reception unit 141X. At this stage, the standby radio reception unit 141X stops receiving radio signals.

  The control management unit 111 that has detected the reception stop of the wireless signal sends a wireless reception switch-back instruction to the reception switching unit 143 in the wireless reception function unit 14. The reception switching unit 143 that has received the switch-back instruction switches the radio reception path connected to the standby radio reception unit 141X to the connection to the first radio reception unit 141A.

  When switching back to the first wireless reception unit 141A is completed, the control management unit 111 sends a wireless reception start instruction to the first wireless reception unit 141A to the reception start processing unit 117. The reception start processing unit 117 receives the instruction and sends out a wireless reception start instruction to the first wireless reception unit 141A. At this stage, the first radio reception unit 141A starts receiving a radio signal.

  As described above, after disconnecting from the operation of the radio reception unit, the recovery of the radio reception unit is detected and the radio signal received from the standby radio reception unit is switched back to be received from the normal radio reception unit. Is possible. As described above, even when the wireless function unit is restored, the operation can be continued without receiving unnecessary radio waves twice, and the standby radio receiving unit is faulty in another operating radio receiving unit, etc. It is possible to wait for the occurrence of

(Embodiment 5)
Next, Embodiment 5 of the present invention will be described with reference to FIG. FIG. 3 is a block diagram showing a schematic configuration of a radio base station apparatus according to Embodiment 5 of the present invention. In FIG. 3, the radio base station apparatus 1C according to the present embodiment converts data from the wired network 121 into a data format suitable for the interface on the radio side, and exists in the radio area in charge of the radio base station apparatus 1C. A radio frequency signal is transmitted via the antenna 2 to the mobile device. Also, data from a mobile device carried at a radio frequency is received via the antenna 2, converted into a data format suitable for the wired interface, and sent to the wired network 121.

  The radio base station apparatus 1C includes a monitoring control function unit 11C, a baseband signal processing unit 12, a radio transmission function unit 13, and a radio reception function unit 14. The monitoring control function unit 11C collects and monitors the state of each function unit in the radio base station apparatus 1C, and controls each function unit according to the state, and includes a control management unit 111 and a state storage unit 112. A status acquisition unit 113, a transmission stop processing unit 114, a transmission start processing unit 115, a reception stop processing unit 116, and a reception start processing unit 117. The control management unit 111 acquires the state of each functional unit in the radio base station device 1C from the state storage unit 112 in which the state of each functional unit in the radio base station device 1C collected by the state acquisition unit 113 is accumulated. The operation control of the transmission stop processing unit 114, the transmission start processing unit 115, the transmission switching unit 133, the reception stop processing unit 116, the reception start processing unit 117, and the reception switching unit 143 is performed. The transmission stop processing unit 114 outputs a wireless transmission stop instruction to one of the plurality of active wireless transmission units 131A to 131C and the standby wireless transmission unit 131X. The transmission start processing unit 115 outputs a wireless transmission start instruction to one of the plurality of active wireless transmission units 131A to 131C and the standby wireless transmission unit 131X. The reception stop processing unit 116 outputs a wireless reception stop instruction to one of the plurality of active wireless reception units 141A to 141C and the standby wireless reception unit 141X. The reception start processing unit 117 outputs a radio reception start instruction to one of the plurality of active radio reception units 141A to 141C and the standby radio reception unit 141X.

  Note that the baseband signal processing unit 12, the wireless transmission function unit 13, and the wireless reception function unit 14 have the same configurations as those of the first and third embodiments, and a description thereof is omitted here.

  According to radio base station apparatus 1C according to the present embodiment, both the operations described in the first and third embodiments can be realized.

  As described above, in a radio base station apparatus capable of wireless transmission / reception, operation can be continued without sending unnecessary radio waves twice and without receiving unnecessary radio waves twice.

(Embodiment 6)
Next, Embodiment 6 of the present invention will be described with reference to FIG. Also in the sixth embodiment, the radio base station apparatus 1C has the same configuration as that of the fifth embodiment.

  According to radio base station apparatus 1C according to the present embodiment, both operations described in the second embodiment and the fourth embodiment can be realized.

  As described above, in a wireless base station device capable of wireless transmission / reception, it becomes possible to continue operation without double transmission of unnecessary radio waves and without reception of unnecessary radio waves, and When the functional unit is restored, switch-back processing can be performed, and the standby wireless transmission / reception unit can be made to wait for the occurrence of a failure or the like of another operating wireless transmission / reception unit.

(Embodiment 7)
Next, Embodiment 7 of the present invention will be described with reference to FIG. FIG. 4 is a block diagram showing a schematic configuration of the radio base station apparatus according to Embodiment 7 of the present invention. In FIG. 4, the radio base station apparatus 1D according to the present embodiment converts data from the wired network 121 into a data format suitable for the interface on the radio side, and exists in the radio area in charge of the radio base station apparatus 1D. A radio frequency signal is transmitted via the antenna 2 to the mobile device. Also, data from a mobile device carried at a radio frequency is received via the antenna 2, converted into a data format suitable for the wired interface, and sent to the wired network 121.

  The radio base station apparatus 1D includes a monitoring control function unit 11D, a baseband signal processing unit 12, and a radio transmission function unit 13. The monitoring control function unit 11D collects and monitors the state of each function unit in the radio base station apparatus 1D, and controls each function unit according to the state. The control management unit 111 and the state storage unit 112 A status acquisition unit 113, a transmission stop processing unit 114, a transmission start processing unit 115, a health check processing unit 118, and a forced stop processing unit 119. The control management unit 111 acquires the state of each functional unit in the radio base station device 1D from the state storage unit 112 in which the state of each functional unit in the radio base station device 1D collected by the state acquisition unit 113 is accumulated. The operation control of the transmission stop processing unit 114, the transmission start processing unit 115, the transmission switching unit 133, the health check processing unit 118, and the forced stop processing unit 119 is performed. The transmission stop processing unit 114 outputs a wireless transmission stop instruction to one of the plurality of active wireless transmission units 131A to 131C and the standby wireless transmission unit 131X. The transmission start processing unit 115 outputs a wireless transmission start instruction to one of the plurality of active wireless transmission units 131A to 131C and the standby wireless transmission unit 131X. The health check processing unit 118 periodically transmits a health check signal to the active wireless transmission units 131A to 131C and the standby wireless transmission unit 131X. The forced stop processing unit 119 outputs a forced transmission stop instruction to the standby wireless transmission unit 131X when there is a wireless transmission unit that does not respond to the health check signal for a certain period of time, and receives the forced transmission stop instruction. The standby wireless transmission unit 131X forcibly stops the wireless transmission of the wireless transmission unit having no response.

  Note that the baseband signal processing unit 12 and the wireless transmission function unit 13 have the same configuration as that of the first embodiment, and a description thereof is omitted here.

  Next, a description will be given of a wireless transmission stop process when the wireless transmission unit becomes unresponsive as a result of the health check process.

  The health check processing unit 118 transmits a health check signal to each wireless transmission unit, for example, at an interval of 10 seconds. The interval of sending the health check signal is not particularly limited. Further, a health check signal may be simultaneously transmitted to a plurality of wireless transmission units by broadcast processing.

  The health check processing unit 118 confirms the normal operation of the wireless transmission unit that has transmitted the health check signal by detecting the response of the health check normally, but an internal failure of the wireless transmission unit that is the target of the health check If a response cannot be received within a specified time due to a failure in a communication path such as a bus, or an NG response is received in response to a health check signal, the wireless transmission unit is regarded as a failure. As described above, the monitoring control function unit 11D generally monitors the state of the wireless transmission unit in the wireless base station device 1D and detects a failure of each wireless transmission unit. Even if the state looks normal, the wireless transmission unit may not operate normally, so this health check process is effective.

  When the health check processing unit 118 transmits a health check signal to the first wireless transmission unit 131A, if any internal failure occurs in the first wireless transmission unit 131A, the first wireless transmission unit The response from 131A times out. The health check processing unit 118 notifies the control management unit 111 of the health check abnormality of the first wireless transmission unit 131A.

  Upon receiving the notification, the control management unit 111 instructs the forced stop processing unit 119 to forcibly stop wireless transmission. The forced stop processing unit 119 outputs a forced stop instruction to the standby radio transmission unit 131X. This instruction includes the number # 1 of the wireless transmission unit 131A that forcibly stops transmission. Receiving the forced transmission stop instruction, the standby wireless transmission unit 131X transmits an output stop instruction to the active first wireless transmission unit 131A that performs the forced transmission stop included in the content of the instruction. The first wireless transmission unit 131A that has received this output stop instruction unconditionally stops wireless transmission.

  When it is determined that the standby radio transmission unit 131X is in a switchable state, the switching process is performed in the same manner as described in the first and second embodiments, and the standby radio transmission unit 131X is instructed. By issuing a wireless transmission start instruction from the transmission start processing unit 115, the operation in the standby system can be continued.

  As described above, by detecting the failure of the functional unit that cannot be detected by the normal status monitoring of the functional unit by the status acquisition unit 113 by the health check process, and particularly by enabling the health check process to detect the failure of the wireless transmission unit, Even when the monitoring control unit cannot recognize the failure, it is possible to avoid the continuous transmission of the radio frequency signal, and it is possible to continue the operation.

(Embodiment 8)
Next, Embodiment 8 of the present invention will be described with reference to FIG. FIG. 5 is a block diagram showing a schematic configuration of a radio base station apparatus according to Embodiment 8 of the present invention. In FIG. 5, the radio base station apparatus 1E according to the present embodiment receives data from a mobile device carried at a radio frequency via the antenna 2, converts the data into a data format suitable for the wired interface, It is sent to the line network 121.

  The radio base station apparatus 1E includes a monitoring control function unit 11E, a baseband signal processing unit 12, and a radio reception function unit 14. The monitoring control function unit 11E collects and monitors the state of each function unit in the radio base station apparatus 1E, and controls each function unit according to the state, and includes a control management unit 111 and a state storage unit 112. A status acquisition unit 113, a reception stop processing unit 116, a reception start processing unit 117, a health check processing unit 118, and a forced stop processing unit 119. The control management unit 111 acquires the status of each functional unit in the radio base station device 1E from the status storage unit 112 in which the status of each functional unit in the radio base station device 1E collected by the status acquisition unit 113 is accumulated. The operation control of the reception stop processing unit 116, the reception start processing unit 117, the reception switching unit 143, the health check processing unit 118, and the forced stop processing unit 119 is performed. The reception stop processing unit 116 outputs a wireless reception stop instruction to one of the plurality of active wireless reception units 141A to 141C and the standby wireless reception unit 141X. The reception start processing unit 117 outputs a radio reception start instruction to one of the plurality of active radio reception units 141A to 141C and the standby radio reception unit 141X. The health check processing unit 118 periodically transmits a health check signal to the active radio reception units 141A to 141C and the standby radio reception unit 141X. The forced stop processing unit 119 outputs a forced reception stop instruction to the standby wireless reception unit 141X when there is a wireless reception unit that has not responded to the health check signal for a certain period of time, and receives the forced reception stop instruction. The standby wireless reception unit 141X forcibly stops the wireless reception of the wireless reception unit that does not respond.

  Note that the baseband signal processing unit 12 and the wireless reception function unit 14 have the same configuration as that of the second embodiment, and a description thereof is omitted here.

  Next, a description will be given of a radio reception stop process when the radio reception unit becomes unresponsive as a result of the health check process.

  The health check processing unit 118 sends a health check signal to each wireless reception unit, for example, at an interval of 10 seconds. The interval of sending the health check signal is not particularly limited. In addition, a health check signal may be simultaneously transmitted to a plurality of wireless reception units by broadcast processing.

  When the health check processing unit 118 sends a health check signal to the first wireless reception unit 141A, if any internal failure occurs in the first wireless reception unit 141A, the first wireless reception unit The response from 141A times out. The health check processing unit 118 notifies the control management unit 111 of the health check abnormality of the first wireless reception unit 141A.

  Upon receiving the notification, the control management unit 111 instructs the forced stop processing unit 119 to forcibly stop wireless reception. The forced stop processing unit 119 outputs a forced stop instruction to the standby radio reception unit 141X. This instruction includes the number # 1 of the wireless reception unit 141A that stops forced reception. Receiving the forced reception stop instruction, standby radio reception section 141X sends a reception stop instruction to the active first radio reception section 141A that performs the forced reception stop included in the content of the instruction. The first wireless reception unit 141A that has received this reception stop instruction unconditionally stops wireless reception.

  Further, when it is determined that the standby radio receiving unit 141X is in a switchable state, the switching process is performed in the same manner as described in the third and fourth embodiments, and the standby radio receiving unit 141X is By issuing a radio reception start instruction from the reception start processing unit 117, the operation in the standby system can be continued.

  As described above, by detecting the failure of the functional unit that cannot be detected by the normal state monitoring of the functional unit by the status acquisition unit 113 by the health check process, in particular, by enabling the health check process to detect the failure of the wireless reception unit, Even when the monitoring control unit cannot recognize the failure, it is possible to avoid continuously receiving the radio frequency signal and to continue the operation.

  The present invention has an effect that transmission of unnecessary radio waves can be prevented even when a failure occurs, and the operation can be continued by separating the location where the failure occurred from the operation. It can be applied to a base station apparatus.

The block diagram which shows schematic structure of the radio base station apparatus which concerns on Embodiment 1 and Embodiment 2 of this invention The block diagram which shows schematic structure of the radio base station apparatus which concerns on Embodiment 3 and Embodiment 4 of this invention The block diagram which shows schematic structure of the radio base station apparatus which concerns on Embodiment 5 and Embodiment 6 of this invention Block diagram showing a schematic configuration of a radio base station apparatus according to Embodiment 7 of the present invention FIG. 9 is a block diagram showing a schematic configuration of a radio base station apparatus according to Embodiment 8 of the present invention.

Explanation of symbols

1A, 1B, 1C, 1D, 1E Radio base station apparatus 2 Antenna 11A, 11B, 11C, 11D, 11E Monitoring control function unit 12 Baseband signal processing unit 13 Radio transmission function unit 14 Radio reception function unit 111 Control management unit 112 State Storage unit 113 Status acquisition unit 114 Transmission stop processing unit 115 Transmission start processing unit 116 Reception stop processing unit 117 Reception start processing unit 118 Health check processing unit 119 Forced stop processing unit 121 Line network (wired network)
131A to 131C Active wireless transmission unit 131X Standby wireless transmission unit 132A to 132C Wireless amplification unit 133 Transmission switching unit 141A to 141C Active wireless reception unit 141X Standby wireless reception unit 143 Reception switching unit

Claims (8)

A plurality of active radio transmission units and one standby radio transmission unit that convert baseband signals into radio frequency signals and send them;
A transmission stop processing unit that outputs a wireless transmission stop instruction to one of the plurality of active wireless transmission units during wireless transmission;
A transmission start processing unit that outputs a wireless transmission start instruction to the standby wireless transmission unit in operation standby;
A transmission switching unit for switching operation from one of the plurality of active wireless transmission units to the standby wireless transmission unit;
A control management unit that performs operation control of the transmission stop processing unit, the transmission start processing unit, and the transmission switching unit;
A radio base station apparatus comprising: When one of the plurality of active wireless transmission units is restored,
The transmission stop processing unit outputs a wireless transmission stop instruction to the standby wireless transmission unit during wireless transmission,
The transmission switching unit performs operation switching from the standby wireless transmission unit to one of the restored plurality of active wireless transmission units,
The radio base station apparatus according to claim 1, wherein the transmission start processing unit outputs a radio transmission start instruction to one of the restored plurality of active radio transmission units. A plurality of active radio receivers for converting radio frequency signals into baseband signals and one standby radio receiver;
A reception stop processing unit that outputs a wireless reception stop instruction to one of the plurality of active wireless reception units during wireless reception; and
A reception start processing unit that outputs a radio reception start instruction to the standby radio reception unit in operation standby;
A reception switching unit that switches operation from one of the plurality of active wireless reception units to the standby wireless reception unit;
A control management unit that performs operation control of the reception stop processing unit, the reception start processing unit, and the reception switching unit;
A radio base station apparatus comprising: When one of the plurality of active wireless receivers is restored,
The reception stop processing unit outputs a radio reception stop instruction to the standby radio reception unit during radio reception,
The reception switching unit performs operation switching from the standby radio reception unit to one of the restored plurality of active radio reception units,
The radio base station apparatus according to claim 3, wherein the reception start processing unit outputs a radio reception start instruction to one of the restored plurality of active radio reception units. A plurality of active radio transmission units and one standby radio transmission unit that convert baseband signals into radio frequency signals and send them;
A transmission stop processing unit that outputs a wireless transmission stop instruction to one of the plurality of active wireless transmission units during wireless transmission;
A transmission start processing unit that outputs a wireless transmission start instruction to the standby wireless transmission unit in operation standby;
A transmission switching unit for switching operation from one of the plurality of active wireless transmission units to the standby wireless transmission unit;
A plurality of active radio receivers for converting radio frequency signals into baseband signals and one standby radio receiver;
A reception stop processing unit that outputs a wireless reception stop instruction to one of the plurality of active wireless reception units during wireless reception; and
A reception start processing unit that outputs a radio reception start instruction to the standby radio reception unit in operation standby;
A reception switching unit that switches operation from one of the plurality of active wireless reception units to the standby wireless reception unit;
A control management unit that performs operation control of the transmission stop processing unit, transmission start processing unit, transmission switching unit, reception stop processing unit, reception start processing unit, and reception switching unit;
A radio base station apparatus comprising: When one of the plurality of active wireless transmission units is restored,
The transmission stop processing unit outputs a wireless transmission stop instruction to the standby wireless transmission unit during wireless transmission,
The transmission switching unit performs operation switching from the standby wireless transmission unit to one of the restored plurality of active wireless transmission units,
The transmission start processing unit outputs a wireless transmission start instruction to one of the restored plurality of active wireless transmission units,
When one of the plurality of active wireless receivers is restored,
The reception stop processing unit outputs a radio reception stop instruction to the standby radio reception unit during radio reception,
The reception switching unit performs operation switching from the standby radio reception unit to one of the restored plurality of active radio reception units,
6. The radio base station apparatus according to claim 5, wherein the reception start processing unit outputs a radio reception start instruction to one of the restored plurality of active radio reception units. A plurality of active radio transmission units and one standby radio transmission unit that convert baseband signals into radio frequency signals and send them;
A transmission stop processing unit that outputs a wireless transmission stop instruction to one of the plurality of active wireless transmission units during wireless transmission;
A transmission start processing unit that outputs a wireless transmission start instruction to the standby wireless transmission unit in operation standby;
A transmission switching unit for switching operation from one of the plurality of active wireless transmission units to the standby wireless transmission unit;
A health check processing unit that transmits a health check signal to the plurality of active wireless transmission units and the standby wireless transmission unit;
A forced stop processing unit that outputs a forced transmission stop instruction to the standby wireless transmission unit when there is a wireless transmission unit that does not respond to the health check signal for a certain period of time;
A control management unit that performs operation control of the transmission stop processing unit, transmission start processing unit, transmission switching unit, health check processing unit, and forced stop processing unit;
The standby radio transmission unit that has received the forced transmission stop instruction forcibly stops the wireless transmission of the wireless transmission unit that does not respond. A plurality of active radio receivers for converting radio frequency signals into baseband signals and one standby radio receiver;
A reception stop processing unit that outputs a wireless reception stop instruction to one of the plurality of active wireless reception units during wireless reception; and
A reception start processing unit that outputs a radio reception start instruction to the standby radio reception unit in operation standby;
A reception switching unit that switches operation from one of the plurality of active wireless reception units to the standby wireless reception unit;
A health check processing unit that sends a health check signal to the plurality of active radio reception units and the standby radio reception unit;
A forced stop processing unit that outputs a forced reception stop instruction to the standby wireless reception unit when there is a wireless reception unit that does not respond to the health check signal for a certain period;
A control management unit that performs operation control of the reception stop processing unit, reception start processing unit, reception switching unit, health check processing unit, and forced stop processing unit;
The standby radio reception unit that has received the forced reception stop instruction forcibly stops the radio reception of the radio reception unit that does not respond.

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