JP7062086B2 - Radio stations for mobile communication systems and mobile communication systems - Google Patents

Description

The present invention relates to a radio station of a mobile communication system and a mobile communication system.

The mobile communication system is used for train radio and the like for wireless communication between a command center and each of a plurality of trains.

Mobile communication systems often include a control station and a plurality of mobile stations. When a mobile communication system is used for train radio, a control station is installed at a command center and a mobile station is installed in each of a plurality of vehicles.

In mobile communication systems, polling contention control often establishes a radio link between the control station and the mobile station. When polling retention control is performed, wireless communication for polling retention control is performed using a dedicated radio wave for polling retention control.

For example, in the mobile communication system described in Patent Document 1, communication by a polling method is performed between a control station and a mobile station by a polling channel using a pair of wave wireless channels, and the mobile station communicates with the control station. Data is transmitted on a contention channel using a one-wave wireless channel dedicated to one-way communication (page 194, upper left column, lines 6-16).

Japanese Unexamined Patent Publication No. 4-103229

In a conventional mobile communication system, as described above, when a wireless link between a control station and a mobile station is established, a polling controller is used by using a dedicated radio wave for polling contention control. Wireless communication for tension control is performed. However, it is not always possible to use the dedicated radio wave. For example, if an external obstacle such as an interference wave or an interfering wave with respect to the dedicated radio wave occurs, the dedicated radio wave cannot be used. In addition, even if an internal failure such as a failure of a radio that performs wireless communication using the dedicated radio wave provided in the control station or mobile station occurs, the dedicated radio wave can be used. It disappears. If the dedicated radio wave cannot be used, polling contention control cannot be performed even if another radio wave can be used, and the control station and the mobile station It becomes impossible to establish a wireless link between the control station and the mobile station, and it becomes impossible to perform wireless communication between the control station and the mobile station.

Further, in the conventional mobile communication system, when the above-mentioned internal failure or external failure occurs in the radio wave used for wireless communication after the wireless link between the control station and the mobile station is established. , It seems that a wireless link between the control station and the mobile station is established, but the wireless link between the control station and the mobile station is established by using the radio wave that does not have sufficient radio communication quality. After that, wireless communication is performed. Such a state is called a silent alarm state or the like.

These problems also occur when a wireless link is established between the control station and the mobile station by a control other than polling / contention control.

The present invention has been made in view of these problems. The problem to be solved by the present invention is to suppress the inability to establish a wireless link between a wireless station and a partner station in a mobile communication system, and to obtain a wireless link between the wireless station and the partner station. It is to suppress the radio communication by using the radio wave which does not have sufficient radio communication quality after being established.

The present invention is directed to radio stations in mobile communication systems.

A radio station of a mobile communication system includes a radio adapter, a radio link unit, and a control unit.

The wireless adapter can perform wireless communication with the partner station by using each of the plurality of wireless waves.

The wireless link unit causes the wireless adapter to perform wireless communication for polling after the contention in order to establish a wireless link with the partner station by using each of the plurality of wireless waves.

The control unit selects unused radio waves from the plurality of radio waves based on quality information indicating the quality of each of the plurality of radio waves, and controls the radio adapter so that the unused radio waves are not used for wireless communication. The plurality of radio waves include a radio wave transmitted from the radio adapter to the other station and a radio wave transmitted from the other station to the radio adapter.

The present invention is also directed to a mobile communication system including a radio station of the mobile communication system.

According to the present invention, radio communication for a radio link between a radio station and a partner station is performed using each of the plurality of radio waves. Therefore, even if a plurality of radio waves include a radio wave that cannot be used for wireless communication for a wireless link between the radio station and the partner station, the remaining radio wave is used to be used between the radio station and the partner station. It is possible to carry out wireless communication for a wireless link with a station. Therefore, it is possible to prevent the wireless link from being unable to be established between the wireless station and the partner station.

Further, according to the present invention, a radio wave that is not used for radio communication is selected based on quality information indicating the quality of each of the plurality of radio waves. Therefore, it is possible to prevent wireless communication from being performed using a wireless wave that does not have sufficient quality of wireless communication after the wireless link between the wireless station and the partner station is established.

The objects, features, aspects and advantages of the present invention will be made clearer by the following detailed description and accompanying drawings.

It is a schematic diagram schematically illustrating the mobile communication system of Embodiments 1 and 2. It is a block diagram which illustrates the control station and the mobile station provided in the mobile communication system of Embodiment 1. FIG. It is a figure which illustrates the flow of data in the control station and the mobile station provided in the mobile communication system of Embodiment 1. FIG. It is a block diagram which illustrates a part of the mobile communication system of the modification of Embodiment 1. FIG. It is a block diagram which illustrates a part of the mobile communication system of the modification of Embodiment 1. FIG. It is a sequence diagram which shows the procedure of establishment of the wireless link between a control station and a mobile station in the mobile communication system of Embodiment 1 and 2. It is a flowchart which shows the operation of the mobile station provided in the mobile communication system of Embodiments 1 and 2. It is a flowchart which shows the operation of the control station provided in the mobile communication system of Embodiment 1. FIG. It is a block diagram which illustrates the control station and the mobile station provided in the mobile communication system of Embodiment 2. It is a figure which illustrates the flow of data in the control station and the mobile station provided in the mobile communication system of Embodiment 2. It is a flowchart which shows the operation of the control station provided in the mobile communication system of Embodiment 2.

1 Embodiment 1
1.1 Mobile communication system FIG. 1 is a schematic diagram schematically showing the mobile communication system of the first embodiment.

The mobile communication system 100 of the first embodiment illustrated in FIG. 1 includes a plurality of control stations CS1, ..., CSM and mobile station MS. The mobile communication system 100 may include elements other than the control stations CS1, ..., CSM and the mobile station MS. The mobile communication system 100 may include only one control station. The mobile communication system 100 may include a plurality of mobile stations.

Each of the control stations CS1, ..., CSM is a radio station that performs wireless communication with the mobile station MS with the mobile station MS as a partner station. The mobile station MS is a wireless station that performs wireless communication with each of the control stations CS1, ..., CSM with each of the control stations CS1, ..., CSM as a partner station.

The control stations CS1, ..., CSM are fixed on the ground. The mobile station MS is mounted on the mobile body M and moves in the moving direction D together with the mobile body M. The mobile communication system 100 is used for train radio and the like for wireless communication between a command center and each of a plurality of trains. When the mobile communication system 100 is used for train radio, control stations CS1, ..., CSM are installed at the command center. Further, the mobile station MS is mounted on the vehicle and moves together with the vehicle.

The control stations CS1, ..., CSM are distributed and arranged in the moving direction D. Further, the mobile body M and the mobile station MS move in the moving direction D. Therefore, the partner station with which the mobile station MS performs wireless communication is sequentially switched between the control stations CS1, ..., CSM.

1.2 Control Station and Mobile Station FIG. 2 is a block diagram illustrating a control station and a mobile station provided in the mobile communication system of the first embodiment. FIG. 3 is a diagram illustrating a data flow in a control station and a mobile station provided in the mobile communication system of the first embodiment.

The control station CS shown in FIGS. 2 and 3 is each of the control stations CS1, ..., CSM shown in FIG.

As shown in FIG. 2, the control station CS includes a wireless adapter 110, a scheduler 111, a wireless link unit 112, a collection unit 113, and a control unit 114. The control station CS may include elements other than these elements.

As shown in FIG. 2, the mobile station MS includes a wireless adapter 130, a scheduler 131, a wireless link unit 132, and a measurement unit 133. The mobile station MS may include elements other than these elements.

The scheduler 111, the wireless link unit 112, the collection unit 113, the control unit 114, the scheduler 131, the wireless link unit 132, and the measurement unit 133 may be configured by a computer that executes a program, or may be configured by hardware that does not execute the program. May be done. Computers that execute programs and hardware that does not execute programs may coexist.

1.3 Wireless Adapter As shown in FIG. 2, the wireless adapter 110 of the control station CS moves by using each of a plurality of wireless waves D1, ..., DN, U1, ..., UN. Wireless communication can be performed with the wireless adapter 130 of the station MS. As shown in FIG. 2, the wireless adapter 130 of the mobile station MS utilizes each of a plurality of radio waves D1, ..., DN, U1, ..., UN to be a wireless adapter of the control station CS. It can perform wireless communication with 110.

The wireless adapter 110 of the control station CS includes a plurality of transceivers TRC1, ..., TRCN. The mobile station MS wireless adapter 130 includes a plurality of transceivers TRM1, ..., TRMN. The radio waves D1, ..., DN, U1, ..., UN include a plurality of paired waves P1, ..., PN. The transceivers TRC1, ..., TRCN of the control station CS use the pair of waves P1, ..., PN, respectively, to perform wireless communication with the transceivers TRM1, ..., TRMN of the mobile station MS. Can be done. The mobile station MS transceivers TRM1, ..., TRMN use the pair of waves P1, ..., PN, respectively, to perform wireless communication with the control station CS transceivers TRC1, ..., TRCN. Can be done.

The transmitter / receiver TRC1, ..., TRCN of the control station CS include transmitters TC1, ..., TCN, respectively, and receivers RC1, ..., RCN, respectively. The transmitters / receivers TRM1, ..., TRMN of the mobile station MS include transmitters TM1, ..., TMN, respectively, and receivers RM1, ..., RMN, respectively. The paired waves P1, ..., PN include the downlink waves D1, ..., DN, respectively, and include the uplink waves U1, ..., UN, respectively. The downlink waves D1, ..., DN are radio waves transmitted from the radio adapter 110 of the control station CS to the radio adapter 130 of the mobile station MS. The uplink waves U1, ..., UN are radio waves transmitted from the radio adapter 130 of the mobile station MS to the radio adapter 110 of the control station CS. The transmitters TC1, ..., TCN of the control station CS use the downlink waves D1, ..., DN, respectively, to transmit the radio frame to the receivers RM1, ..., RMN, respectively. Can communicate. The receivers RC1, ..., RCN of the control station CS use the uplink waves U1, ..., UN, respectively, to receive the wireless frame from the transmitters TM1, ..., TMN, respectively. Can communicate. The receivers RM1, ..., RMN of the mobile station MS use the downlink waves D1, ..., DN, respectively, to receive the wireless frame from the transmitters TC1, ..., TCN. Can communicate. The transmitters TM1, ..., TMN of the mobile station MS use the uplink waves U1, ..., UN, respectively, to transmit the wireless frame to the receivers RC1, ..., RCN. Can communicate.

1.4 Scheduler The scheduler 111 of the control station CS shown in FIG. 2 schedules the transmission timing of the radio frame transmitted from the radio adapter 110 of the control station CS to the radio adapter 130 of the mobile station MS. The mobile station MS scheduler 131 illustrated in FIG. 2 schedules the transmission timing of the wireless frame transmitted from the mobile station MS wireless adapter 130 to the control station CS wireless adapter 110.

1.5 Radio Link Unit The radio link unit 112 of the control station CS illustrated in FIGS. 2 and 3 performs radio communication for a radio link between the control station CS and the mobile station MS by a plurality of radio waves D1, ..., DN, U1, ..., UN are used to cause the wireless adapter 110 to perform the operation. The radio link unit 132 of the mobile station MS illustrated in FIGS. 2 and 3 performs radio communication for a radio link between the control station CS and the mobile station MS with a plurality of radio waves D1, ..., DN. The wireless adapter 130 is made to perform each of U1, ..., UN.

Wireless communication for a wireless link between the control station CS and the mobile station MS is performed in parallel using a plurality of paired waves P1, ..., PN.

The wireless communication for the wireless link between the control station CS and the mobile station MS may be any, but in the first embodiment, it is the wireless communication for polling contention control. .. Therefore, the radio link unit 112 of the control station CS includes a polling request transmitting unit 120, a polling response receiving unit 121, a contention response transmitting unit 122, and a contention receiving unit 123. Further, the wireless link unit 132 of the mobile station MS includes a polling request receiving unit 140, a polling response transmitting unit 141, a contention response receiving unit 142, and a contention transmitting unit 143.

As shown in FIG. 3, the polling request transmission unit 120 of the control station CS transmits the polling request 150 to the mobile station MS. Further, the polling request receiving unit 140 of the mobile station MS receives the polling request 150 from the control station CS.

The polling response transmission unit 141 of the mobile station MS transmits a polling response 151 to the control station CS in response to the polling request receiving unit 140 of the mobile station MS receiving the polling request 150. Further, the polling response receiving unit 121 of the control station CS receives the polling response 151 from the mobile station MS.

If the polling response receiving unit 121 of the control station CS can receive the polling response 151, the polling is successful and the wireless link between the control station CS and the mobile station MS is maintained. On the other hand, if the polling response receiving unit 121 of the control station CS cannot receive the polling response 151, the polling fails and the wireless link between the control station CS and the mobile station MS is disconnected.

The contention transmission unit 143 of the mobile station MS transmits the contention 153 to the control station CS. Further, the contention receiving unit 123 of the control station CS receives the contention 153 from the mobile station MS.

The contention response transmission unit 122 of the control station CS transmits the contention response 152 to the mobile station MS in response to the contention receiving unit 123 of the control station CS receiving the contention 153. Further, the contention response receiving unit 142 of the mobile station MS receives the contention response 152 from the control station CS.

If the contention response receiving unit 142 of the mobile station MS can receive the contention response 152, the contention is successful and a wireless link between the control station CS and the mobile station MS is established.

1.6 Collection unit and measurement unit The measurement unit 133 of the mobile station MS shown in FIGS. 2 and 3 is a downlink wave D1 transmitted from the radio adapter 110 of the control station CS to the radio adapter 130 of the mobile station MS. ..., Measure the transmission quality of each of the DNs. Further, the measurement unit 133 of the mobile station MS measures the state of the wireless adapter 130 of the mobile station MS. Further, as shown in FIG. 3, the measurement unit 133 of the mobile station MS adds the transmission quality information 155 indicating the measured transmission quality and the state information 156 indicating the measured state to the polling response 151, and the transmission quality. The polling response 151 to which the information 155 and the status information 156 are added is transmitted to the control station CS. The transmission quality information 155 and the status information 156 may be added to the information other than the polling response 151.

The added transmission quality information 155 is a reception error when the wireless frame is transmitted by each of the downlink waves D1, ..., DN, and the downlink waves D1, ..., DN. Includes information, etc. The added state information 156 includes failure information, frequency deviation, and the like of the wireless adapter 130 of the mobile station MS.

The collecting unit 113 of the control station CS illustrated in FIGS. 2 and 3 collects the transmission quality information 155 and the status information 156 added to the polling response 151 received by the polling response receiving unit 121 of the control station CS. Further, the collection unit 113 of the control station CS measures the state of the wireless adapter 110 of the control station CS. Further, the collecting unit 113 of the control station CS uses the collected transmission quality information 155 and the state information 156, and the state information indicating the measured state as a plurality of radio waves D1, ..., DN, U1, ..., It is included in the quality information 154 indicating the quality of each UN.

1.7 Modified example of a radio station including a collecting unit and a measuring unit FIG. 4 is a block diagram illustrating a part of a mobile communication system of the modified example of the first embodiment.

In the mobile communication system 100 of the first embodiment shown in FIG. 2, the control station CS includes a collecting unit 113, and the mobile station MS includes a measuring unit 133. On the other hand, in the mobile communication system 100A of the modification of the first embodiment shown in FIG. 4, the control station CS includes the measurement unit 115, and the mobile station MS includes the collection unit 134.

The measuring unit 115 of the control station CS measures the transmission quality of each of the uplink waves U1, ..., UN transmitted from the wireless adapter 130 of the mobile station MS to the wireless adapter 110 of the control station CS. Further, the measuring unit 115 of the control station CS measures the state of the wireless adapter 110 of the control station CS. Further, the measurement unit 115 of the control station CS periodically transmits the transmission quality information indicating the measured transmission quality and the state information indicating the measured state from the wireless adapter 110 of the control station CS to the wireless adapter 130 of the mobile station MS. The broadcast information to which the transmission quality information and the status information are added is transmitted to the mobile station MS in addition to the broadcast information to be transmitted. Transmission quality information and status information may be added to information other than broadcast information. The transmission quality information indicating the measured transmission quality and the state information indicating the measured state are included in the quality information 154.

The collection unit 134 of the mobile station MS collects the transmission quality information and the status information added to the transmitted broadcast information. Further, the collection unit 134 of the mobile station MS measures the state of the wireless adapter 130 of the mobile station MS. Further, the collection unit 134 of the mobile station MS includes the collected transmission quality information and the state information, and the state information indicating the measured state in the quality information 154.

1.8 Control unit The control unit 114 of the control station CS shown in FIGS. 2 and 3 receives each time the quality information 154 is passed to the wireless adapter 110 of the control station CS based on the passed quality information 154. The degeneration control of the radio band is performed. When the control unit 114 of the control station CS performs the reduction control of the radio band with respect to the radio adapter 110 of the control station CS, the control unit 114 has a plurality of radio waves D1, ..., DN based on the passed quality information 154. , U1, ..., Unused radio waves are selected from UN, and the radio adapter 110 of the control station CS is controlled so that the selected unused radio waves are not used for wireless communication. The degeneration control of the radio band can be performed, for example, by the method described in Japanese Patent No. 49833439.

1.9 Modification example of a radio station including a control unit FIG. 5 is a block diagram illustrating a part of a mobile communication system of the modification of the first embodiment.

In the mobile communication system 100 of the first embodiment shown in FIG. 2, the control station CS includes a control unit 114. On the other hand, in the mobile communication system 100B of the modification of the first embodiment shown in FIG. 5, the mobile station MS includes a control unit 135.

Each time the quality information 154 is passed, the control unit 135 of the mobile station MS performs degeneration control of the radio band for the wireless adapter 130 of the mobile station MS based on the passed quality information 154.

1.10 Procedure for establishing a wireless link FIG. 6 is a sequence diagram showing a procedure for establishing a wireless link between a control station and a mobile station in the mobile communication system of the first embodiment. FIG. 6 shows the establishment of a radio link between the control station and the mobile station when the pair wave P1, ..., PN is three pair waves consisting of pair wave A, pair wave B and pair wave C. The procedure of is shown.

When establishing a wireless link between the control station CS and the mobile station MS in the mobile communication system 100, the contention procedure S101 and the polling procedure S102 shown in FIG. 6 are sequentially executed.

In the contention procedure S101, the contention transmitting unit 143 of the mobile station MS and the contention receiving unit 123 of the control station CS use the pair of waves A to perform transmission / reception S111 of the contention 153. Further, the contention response transmitting unit 122 of the control station CS and the contention response receiving unit 142 of the mobile station MS perform transmission / reception S112 of the contention response 152 by using the pair wave A. When the transmission / reception S111 of the contention 153 and the transmission / reception S112 of the contention response 152 are successful, the establishment S113 of the wireless link between the control station CS and the mobile station MS by the pair wave A is performed.

Subsequently, the contention transmitting unit 143 of the mobile station MS and the contention receiving unit 123 of the control station CS perform transmission / reception S121 of the contention 153 using the pair wave B. Further, the contention response transmitting unit 122 of the control station CS and the contention response receiving unit 142 of the mobile station MS perform transmission / reception S122 of the contention response 152 by using the pair wave B. When the transmission / reception S121 of the contention 153 and the transmission / reception S122 of the contention response 152 are successful, the establishment S123 of the wireless link between the control station CS and the mobile station MS by the pair wave B is performed.

Subsequently, the contention transmitting unit 143 of the mobile station MS and the contention receiving unit 123 of the control station CS perform transmission / reception S131 of the contention 153 using the pair of waves C. Further, the contention response transmitting unit 122 of the control station CS and the contention response receiving unit 142 of the mobile station MS perform transmission / reception S132 of the contention response 152 by using the pair wave C. When the transmission / reception S131 of the contention 153 and the transmission / reception S132 of the contention response 152 are successful, the establishment S133 of the wireless link between the control station CS and the mobile station MS by the pair wave C is performed.

In the polling procedure S102, the polling request transmitting unit 120 of the control station CS and the polling request receiving unit 140 of the mobile station MS perform transmission / reception S141 of the polling request 150 using the pair wave A. Further, the polling response transmitting unit 141 of the mobile station MS and the polling response receiving unit 121 of the control station CS use the pair wave A to perform transmission / reception S142 of the polling response 151. When the transmission / reception S141 of the polling request 150 and the transmission / reception S142 of the polling response 151 are successful, the wireless link between the control station CS and the mobile station MS by the pair wave A is maintained. However, if the transmission / reception S141 of the poll request 150 and the transmission / reception S142 of the polling response 151 fail, the wireless link between the control station CS and the mobile station MS is disconnected by the pair wave A S143.

Subsequently, the polling request transmitting unit 120 of the control station CS and the polling request receiving unit 140 of the mobile station MS perform transmission / reception S151 of the polling request 150 using the pair wave B. Further, the polling response transmitting unit 141 of the mobile station MS and the polling response receiving unit 121 of the control station CS use the pair wave B to perform transmission / reception S152 of the polling response 151. When the transmission / reception S151 of the polling request 150 and the transmission / reception S152 of the polling response 151 are successful, the wireless link between the control station CS and the mobile station MS by the pair wave B is maintained. However, if the transmission / reception S151 of the polling request 150 and the transmission / reception S152 of the polling response 151 fail, the wireless link between the control station CS and the mobile station MS by the pair wave B is disconnected S153.

Subsequently, the polling request transmitting unit 120 of the control station CS and the polling request receiving unit 140 of the mobile station MS perform transmission / reception S161 of the polling request 150 using the pair of waves C. Further, the polling response transmitting unit 141 of the mobile station MS and the polling response receiving unit 121 of the control station CS use the pair of waves C to perform transmission / reception S162 of the polling response 151. When the transmission / reception S161 of the polling request 150 and the transmission / reception S162 of the polling response 151 are successful, the wireless link between the control station CS and the mobile station MS by the pair wave C is maintained. However, if the transmission / reception S161 of the poll request 150 and the transmission / reception S162 of the polling response 151 fail, the wireless link between the control station CS and the mobile station MS is disconnected by the pair wave C S163.

1.11 Operation of mobile station FIG. 7 is a flowchart showing the operation of the mobile station provided in the mobile communication system of the first embodiment.

The mobile station MS uses each of the pair of waves P1, ..., PN to execute an operation for transmitting and receiving the contention 153 and the contention response 152 in steps S181 and S182 shown in FIG. In steps S183 to S185 shown in FIG. 7, the operation for transmitting and receiving the polling request 150 and the polling response 151 is executed.

In step S181, the contention transmission unit 143 of the mobile station MS transmits the contention 153 to the control station CS when the control station CS is supplemented by the broadcast information transmitted on the control channel, and the control station CS transmits the contention 153. Wait for the contention response 152 to be sent.

In the following step S182, it is determined whether or not the contention response receiving unit 142 of the mobile station MS has received the contention response 152 from the control station CS.

If the contention response receiving unit 142 of the mobile station MS has not received the contention response 152, in step S181, the contention transmitting unit 143 of the mobile station MS retransmits the contention 153 to the control station CS. As a result, until the contention response receiving unit 142 of the mobile station MS receives the contention response 152, the contention transmitting unit 143 of the mobile station MS repeatedly transmits the contention 153 to the control station CS.

When the contention response receiving unit 142 of the mobile station MS receives the contention response 152, in step S183, the measuring unit 133 of the mobile station MS moves from the wireless adapter 110 of the control station CS to the wireless adapter of the mobile station MS. The transmission quality of each of the downlink waves D1, ..., DN transmitted to the 130 is measured, and the state of the wireless adapter 130 of the mobile station MS is measured.

In the following step S184, the measurement unit 133 of the mobile station MS adds the transmission quality information 155 indicating the measured transmission quality and the state information 156 indicating the measured state to the polling response 151.

In the following step S185, the polling response transmission unit 141 of the mobile station MS transmits the polling response 151 to which the transmission quality information 155 and the status information 156 are added to the control station CS.

The measurement unit 133 of the mobile station MS remeasures the transmission quality and the state in step S183 after the polling response 151 is transmitted to the control station CS. As a result, the measurement unit 133 of the mobile station MS repeatedly measures the transmission quality and the state. Further, the polling response transmission unit 141 of the mobile station MS repeatedly transmits the polling response 151 to which the transmission quality information 155 and the status information 156 are added to the control station CS.

When a new control station CS is supplemented with the movement of the mobile station MS, in step S181, the contention transmission unit 143 of the mobile station MS transmits the contention 153 to the supplemented new control station CS. Then, steps S182 to S185 are executed in the same manner.

1.12 Operation of control station FIG. 8 is a flowchart showing the operation of the control station provided in the mobile communication system of the first embodiment.

The control station CS uses each of the pair of waves P1, ..., PN to execute an operation for transmitting and receiving the contention 153 and the contention response 152 in steps S191 and S192 shown in FIG. In steps S193 to S195 shown in FIG. 8, the operation for transmitting and receiving the polling request 150 and the polling response 151 is executed.

In step S191, the contention receiving unit 123 of the control station CS receives the contention 153 from the mobile station MS.

In the following step S192, in response to the contention receiving unit 123 of the control station CS receiving the contention 153, the contention response transmitting unit 122 of the control station CS transmits the contention response 152 to the mobile station MS. do. This establishes a wireless link between the control station CS and the mobile station MS. In addition, information indicating that a wireless link between the control station CS and the mobile station MS is established is stored in the control station CS.

In step S193 after the wireless link between the control station CS and the mobile station MS is established, the polling request transmission unit 120 of the control station CS transmits the polling request 150 to the mobile station MS, and the mobile station MS transmits the poll request 150. Wait for the polling response 151 to be sent.

In the following step S194, it is determined whether or not the polling response receiving unit 121 of the control station CS has received the polling response 151 within the set time.

If the polling response receiving unit 121 of the control station CS has not received the polling response 151 within the set time, in step S193, the polling request transmitting unit 120 of the control station CS sends the polling request 150 to the mobile station MS. Resend. The re-transmission of the polling request 150 is repeated until the number of times reaches the set number of times. Further, at the time of retryout when the number of times of re-transmission of the polling request 150 reaches the set number of times, the control station CS determines that the mobile station MS has moved out of the service area, and the control station CS and the mobile station MS are separated from each other. Disconnect the wireless link. As a result, the information indicating that the wireless link between the control station CS and the mobile station MS is established is deleted from the control station CS.

When the polling response receiving unit 121 of the control station CS receives the polling response 151 within the set time, in step S195, the collecting unit 113 of the control station CS receives the transmission quality added to the received polling response 151. Information 155 and status information 156 are collected, and the collected transmission quality information 155 and status information 156 are included in the quality information 154 notified to the control unit 114 of the control station CS.

In step S196, the control unit 114 of the control station CS determines the quality of each of the paired waves P1, ..., PN based on the quality information 154.

In the following step S197, the control unit 114 of the control station CS determines whether or not an abnormality has occurred in each of the pair of waves P1, ..., PN. The control unit 114 of the control station CS determines that an abnormality has not occurred in the pair wave whose quality indicated by the quality information 154 meets the standard, and an abnormality has occurred in the pair wave whose quality indicated by the quality information 154 does not meet the standard. Judge that it has occurred.

If no abnormality has occurred in the pair of waves, the pair of waves continues to be used, and in step S193, the polling request transmitting unit 120 of the control station CS retransmits the polling request 150 to the mobile station MS.

If an abnormality has occurred in the pair of waves, the use of the pair of waves is not continued, and in step S197, the control unit 114 of the control station CS prevents the pair of waves from being used for wireless communication. Degeneration control of the wireless band is performed for the wireless adapter 110.

1.13 Effect of the first embodiment According to the first embodiment, the control station CS and the mobile station MS are used by using each of the plurality of radio waves D1, ..., DN, U1, ..., UN. Wireless communication is performed for the wireless link between. Therefore, the radio waves that cannot be used for the radio communication for the radio link between the control station CS and the mobile station MS become a plurality of radio waves D1, ..., DN, U1, ..., UN. Even if it is included, the remaining radio waves can be used to perform radio communication for a radio link between the control station CS and the mobile station MS. Therefore, it is possible to suppress the inability to establish a wireless link between the control station CS and the mobile station MS.

Further, according to the first embodiment, a radio wave that is not used for wireless communication is selected based on the quality information 154 indicating the quality of each of the plurality of radio waves D1, ..., DN, U1, ..., UN. Will be done. Therefore, after the wireless link between the control station CS and the mobile station MS is established, it is possible to suppress the wireless communication from being performed by using the wireless wave which does not have sufficient quality of the wireless communication.

According to the first embodiment, the measurement unit 133 of the mobile station MS measures the transmission quality of each of the downlink waves D1, ..., DN. Therefore, whether or not each of the downlink waves D1, ..., DN is used for wireless communication is independent of whether or not each of the uplink waves U1, ..., UN is used for wireless communication. It is possible to control the degeneration of the radio band in finer detail, and the radio band can be used efficiently. When the measurement unit 115 of the control station CS measures the transmission quality of each of the uplink waves U1, ..., UN, whether or not each of the uplink waves U1, ..., UN is used for wireless communication. It is possible to independently control whether or not each of the downlink waves D1, ..., DN is used for wireless communication, and finer wireless band decompression control can be performed.

2 Embodiment 2
2.1 Main Differences Between Embodiment 1 and Embodiment 2 FIG. 1 is also a configuration diagram illustrating the mobile communication system of the second embodiment. FIG. 9 is a block diagram illustrating a control station and a mobile station provided in the mobile communication system of the second embodiment. FIG. 10 is a diagram illustrating a data flow in a control station and a mobile station provided in the mobile communication system of the second embodiment.

The mobile communication system 200 of the second embodiment including the control station CS and the mobile station MS shown in FIGS. 9 and 10 mainly has the following points, the control station CS and the mobile station shown in FIGS. 2 and 3. It differs from the mobile communication system 100 of the first embodiment including the station MS.

In the mobile communication system 100 of the first embodiment, the control unit 114 of the control station CS has quality information 154 indicating the quality of each of the plurality of radio waves D1, ..., DN, U1, ..., UN. Each time it is passed, the reduction control of the radio band is performed so as not to use the radio wave whose quality indicated by the passed quality information 154 does not meet the standard.

On the other hand, in the mobile communication system 200 of the second embodiment, the storage unit 116 of the control station CS determines the quality of each of the plurality of radio waves D1, ..., DN, U1, ..., UN. The indicated quality information 154 is accumulated. As a result, the storage unit 116 of the control station CS stores time-series data 158 indicating the time change of the quality of each of the plurality of radio waves D1, ..., DN, U1, ..., UN. Further, the control unit 114 of the control station CS performs degeneration control of the radio band so as not to use the radio wave whose quality with time change tends to decrease, which is indicated by the stored time series data 158.

In the following, the configuration adopted in the mobile communication system 200 of the second embodiment will be described in relation to the above differences. As for the configuration not described, the configuration adopted in the mobile communication system 100 of the first embodiment is also adopted in the mobile communication system 200 of the second embodiment.

2.2 Configuration adopted in the mobile communication system of the second embodiment In the mobile communication system 200 of the second embodiment, the control station CS further includes a storage unit 116. The storage unit 116 may be provided in addition to the control station CS. For example, the storage unit 116 may be provided in the mobile station MS, or may be provided in an element of the mobile communication system 200 other than the control station CS and the mobile station MS.

The storage unit 116 of the control station CS stores quality information 154 indicating the quality of each of the radio waves D1, ..., DN, U1, ..., UN during the operation of the mobile communication system 200. As a result, the storage unit 116 of the control station CS stores the time-series data 158 indicating the time change of the quality of each of the radio waves D1, ..., DN, U1, ..., UN. The storage unit 116 of the control station CS may further store the operation data of the mobile communication system 200 during the operation of the mobile communication system 200. In this case, the stored time-series data 158 is the time of the operation data of the mobile communication system 200 in addition to the time change of the quality of each of the radio waves D1, ..., DN, U1, ..., UN. Show change. The operational data of the mobile communication system 200 includes, for example, the position information of the mobile station MS.

The control unit 114 of the control station CS performs degeneration control of the radio band with respect to the radio adapter 110 of the control station CS based on the stored time series data 158. When the control unit 114 of the control station CS performs the reduction control of the radio band with respect to the radio adapter 110 of the control station CS, the radio waves D1, ..., DN based on the stored time series data 158. , U1, ..., Unused radio waves are selected from UN, and the radio adapter 110 of the control station CS is controlled so that the selected unused radio waves are not used for wireless communication.

FIG. 6 is also a sequence diagram showing a procedure for establishing a wireless link between a control station and a mobile station in the mobile communication system of the second embodiment. FIG. 7 is also a flowchart showing the operation of the mobile station provided in the mobile communication system of the second embodiment. FIG. 11 is a flowchart showing the operation of the control station provided in the mobile communication system of the second embodiment.

The control station CS uses each of the pair of waves P1, ..., PN to execute an operation for transmitting and receiving the contention 153 and the contention response 152 in steps S291 and S292 shown in FIG. In steps S293 to S295 shown in FIG. 11, the operation for transmitting and receiving the polling request 150 and the polling response 151 is executed. In steps S291 to S295, the same operations as those executed in steps S191 to S195 shown in FIG. 8 are executed.

In step S296, the storage unit 116 of the control station CS stores the quality information 154. As a result, the time-series data 158, which is a set of quality information, is stored in the storage unit 116 of the control station CS.

In the following step S297, the control unit 114 of the control station CS determines whether or not each of the pair of waves P1, ..., And PN has a tendency to generate an abnormality. The control unit 114 of the control station CS determines that there is no tendency for anomalies to occur in the pair of waves whose quality time change indicated by the time series data 158 does not have a decreasing tendency, and the quality time change indicated by the time series data 158 changes. It is determined that the pair of waves having a downward tendency has a tendency to generate an abnormality.

In the following step S298, the control unit 114 of the control station CS determines whether or not an abnormality has occurred in each of the pair of waves P1, ..., PN, as in step S197 shown in FIG.

If there is no tendency for an abnormality to occur in the pair of waves and no abnormality has occurred in the pair of waves, the use of the pair of waves is continued, and in step S293, the polling request transmission unit 120 of the control station CS makes a poll request 150 to the mobile station MS. Resend.

If there is a tendency for an abnormality to occur in the pair of waves, or if an abnormality has occurred in the pair of waves, the use of the pair of waves is not continued, and in step S299, the control unit 114 of the control station CS uses the pair of waves. The degeneration control of the radio band is performed for the wireless adapter 110 of the control station CS so as not to be used for wireless communication.

In step S299, an operation other than the degeneration control of the radio band may be executed. For example, when the mobile communication system 200 includes a notification unit for notifying the system administrator of the notification, the notification unit may notify the system administrator of the time series data 158. The system administrator predicts the degree of deterioration of the transceivers TRC1, ..., TRCN, TRM1, ..., TRMN from the notified time-series data 158, and arranges a new transceiver before a failure occurs. Etc. can be operated. The time series data 158 can also be used for learning the failure characteristics of the mobile communication system 200. Therefore, based on the time-series data 158, it is predicted before the failure on the wireless transmission path of the wireless adapter 110, the wireless adapter 130, and the wireless waves D1, ..., DN, U1, ..., UN actually occurs. You can also do it.

When the time-series data 158 shows the time change of the operational data of the mobile communication system 200 in addition to the time change of the quality of each of the radio waves D1, ..., DN, U1, ..., UN, the mobile communication system The contraction control of the radio band may be performed by utilizing the time change of the operation data of 200. For example, when the operational data of the mobile communication system 200 includes the position information of the mobile station MS, the degeneration control of the radio band may be performed based on the correlation between the quality and the position information of the mobile station MS. For example, if the quality tends to deteriorate in a specific time zone in a specific area, the control station 200 in the specific area may perform degeneration control of the radio band in the specific time zone.

2.3 Effect of the second embodiment According to the second embodiment, it is possible to suppress the inability to establish a wireless link between the control station CS and the mobile station MS, as in the first embodiment. Can be done.

Further, according to the second embodiment, as in the first embodiment, the radio wave having not sufficient quality of radio communication is used after the radio link between the control station CS and the mobile station MS is established. It is possible to suppress the wireless communication.

Further, according to the second embodiment, if there is a tendency for an abnormality to occur in the pair of waves even before the abnormality occurs in the pair of waves, the degeneration control of the radio band is performed. Therefore, it is possible to further suppress the inability to establish a wireless link between the control station CS and the mobile station MS.

In the present invention, the embodiments can be appropriately modified or omitted within the scope of the invention.

Although the present invention has been described in detail, the above description is exemplary in all aspects and the invention is not limited thereto. It is understood that innumerable variations not illustrated can be assumed without departing from the scope of the present invention.

100, 100A, 100B, 200 Mobile communication system, CS1, CSM, CS control station, MS mobile station, 110,130 wireless adapter, 112,132 wireless link unit, 113,134 collection unit, 114,135 control unit, 115, 133 Measuring unit, 116 storage unit, 154 quality information, 155 transmission quality information, 156 status information, 158 time series data, P1, PN pair wave, D1, DN downlink wave, U1, UN uplink wave.

Claims (8)

A wireless adapter that can perform wireless communication with the other station using each of multiple wireless waves,
A wireless link unit that causes the wireless adapter to perform the wireless communication that polls after the contention to establish a wireless link with the partner station by using each of the plurality of wireless waves.
An unused radio wave is selected from the plurality of radio waves based on quality information indicating the quality of each of the plurality of radio waves, and the radio adapter is controlled so that the unused radio wave is not used for the radio communication. Control unit and
Equipped with
The plurality of radio waves are radio stations of a mobile communication system including a radio wave transmitted from the radio adapter to the partner station and a radio wave transmitted from the partner station to the radio adapter . The radio station of the mobile communication system according to claim 1, wherein the unused radio wave is a radio wave whose quality indicated by the quality information does not meet the standard. The quality information is time-series data indicating the time change of the quality.
The radio station of the mobile communication system according to claim 1, wherein the unused radio wave is a radio wave whose quality with respect to time changes, which is indicated by the time series data, tends to decrease. The partner station includes a measuring unit for measuring the transmission quality of the radio wave transmitted from the wireless adapter to the partner station.
The quality information is a radio station of any of the mobile communication systems according to any one of claims 1 to 3, which includes transmission quality information indicating the transmission quality of the radio wave transmitted from the radio adapter to the partner station. Further, a measuring unit for measuring the transmission quality of the radio wave transmitted from the partner station to the radio adapter is provided.
The quality information is a radio station of any of the mobile communication systems according to any one of claims 1 to 3, which includes transmission quality information indicating the transmission quality of radio waves transmitted from the partner station to the radio adapter. The quality information is a radio station of the mobile communication system according to claim 1, which includes state information indicating the state of the wireless adapter. The wireless adapter is the first wireless adapter.
The partner station is provided with a second wireless adapter.
The first wireless adapter can perform the wireless communication with the second wireless adapter by using each of the plurality of wireless waves.
The quality information is a radio station of the mobile communication system according to claim 1, which includes state information indicating the state of the second radio adapter. With the control station
With mobile stations
Equipped with
One of the control station and the mobile station is a radio station of the mobile communication system according to claim 1.
The other of the control station and the mobile station is the mobile communication system which is the partner station.

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