JP6448412B2 - Wireless communication system - Google Patents

Description

  Embodiments described herein relate generally to a wireless communication system.

  Conventionally, multi-hop communication in which communication between a terminal and a server is performed via wireless communication by a plurality of relay nodes (for example, base stations) is known. In this multi-hop communication, when a certain relay node fails, a communication system is known that prevents the communication from being interrupted by directly communicating with the relay nodes adjacent to the failed relay node. . However, in this case, it is necessary to set the installation interval of each relay node to be shorter than the distance that the relay node can communicate, and the relay node may not be used efficiently.

JP 2009-201035 A

  The problem to be solved by the present invention is to provide a wireless communication system that can efficiently use a base station and recover communication even when a failure occurs in the base station.

  The wireless communication system according to the embodiment includes a plurality of base stations having two or more wireless devices including a first wireless device and a second wireless device, and a control unit that controls the two or more wireless devices. Each radio of each base station is led by a slave radio of another base station, a master radio that can communicate with a mobile station different from the base station, and a master radio of another base station , Functioning as one of the slave radios communicating with the master radio of the other base station. The control unit of each base station has the first radio of the base station when the first radio functions as the master radio and the second radio functions as the slave radio. When a failure of the wireless device is detected, the second wireless device is caused to function as the master wireless device.

1 is a diagram showing a communication state of a wireless communication system 1. FIG. 1 is a diagram showing a functional configuration of a wireless communication system 1. FIG. It is a figure which shows a mode that the 1st radio | wireless machine (M) 12C of 10 C of base stations failed. The figure which shows the state of each function structure after the 1st radio | wireless machine (M) 12C of 10 C of base stations has failed. The flowchart which shows the flow of the failure detection process of the own base station 10 performed by the control part 20. FIG. The figure for demonstrating the method of detecting the failure of a master radio | wireless machine. The flowchart which shows the flow of the failure detection process of the other base station 10 performed by the control part 20. FIG. The flowchart which shows the flow of the failure detection process of the base station 10 2 or more away performed by the control part 20. FIG. The figure which shows an example in case the communication link is not established between the slave radio | wireless machine of the own base station 10, and the master radio | wireless of the base station 10 adjacent. The figure which shows an example when the communication link is established between the slave radio | wireless machine of the own base station 10, and the master radio | wireless of the adjacent base station 10. FIG. It is a figure which shows a mode that the 2nd radio | wireless machine (M) 16C of 10 C of base stations failed. The flowchart which shows the flow when the slave radio | wireless machine performed by the control part 20 fails. The figure which shows a mode that the 1st radio | wireless machine (M) 12C of the base station 10B failed when the base station 10 branches. The figure which shows a mode that the 2nd radio | wireless machine (S) 16C of the base station 10B failed when the base station 10 branched.

  Hereinafter, a wireless communication system according to an embodiment will be described with reference to the drawings.

(First embodiment)
A functional configuration of the wireless communication system 1 will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram illustrating a communication state of the wireless communication system 1. FIG. 2 is a diagram illustrating a functional configuration of the wireless communication system 1. The wireless communication system 1 includes a plurality of base stations (base stations 10A to 10E in the figure) that perform wireless communication with each other. The wireless communication system 1 is a system capable of relaying communication between the mobile station 30 and the server device 40.

  Regions 25A to 25E in FIG. 1 are regions in which each of the base stations 10A to 10E can wirelessly communicate with the mobile station 30. The base station 10A and the base station 10B can wirelessly communicate with each other, the base station 10B and the base station 10C can wirelessly communicate with each other, and the base station 10C and the base station 10D can wirelessly communicate with each other, The base station 10D and the base station 10E can communicate with each other wirelessly.

  Further, the base station 10A is connected to the server device 40 so as to be communicable by wire or wireless, for example. For example, the wireless communication system 1 forms a multi-hop network in which information provided from the server device 40 is relayed in multiple stages between a plurality of base stations 10. In the example of FIG. 1, the information provided from the server device 40 to the base station 10 </ b> A is transmitted in the order of the base station 10 </ b> B and the base station 10 </ b> C and delivered to the mobile station 30.

  Hereinafter, when it is not distinguished which base station, A to E are omitted from the reference numerals and simply referred to as the base station 10. Each base station 10 can perform the above-described relay and wirelessly communicate with a mobile station 30 that is a moving wireless station. The base station 10 includes a first radio 12 that communicates using the first antenna 14, a second radio 16 that communicates using the second antenna 18, and a control unit 20.

  The first radio 12 can function as either a master radio or a slave radio. Also, the second radio 16 can function as either a master radio or a slave radio. However, when both the first wireless device and the second wireless device are normal, both the first wireless device 12 and the second wireless device 16 can simultaneously function as a master wireless device or a slave wireless device. It shall not be possible.

  The master radio is a radio that plays a role of communicating with the mobile station 30 while leading the slave radio of the other base station 10. The master radio can communicate with a plurality of slave radios. That is, one-to-N communication is possible. For example, the master radio performs polling in the communicable area 25 and receives a communication request from the mobile station 30. In addition, the master radio detects a slave radio that exists in a communicable area with another base station (not shown) and establishes a communication link with the detected slave radio.

  The slave radio is led by the master radio of another base station 10 and communicates with the master radio of the other base station 10. Note that a slave radio cannot communicate with a plurality of master radios at the same time. Further, communication between master radio devices and between slave radio devices cannot be performed.

  Further, hereinafter, when the first radio device 12 or the second radio device 16 functions as a master radio device, the first radio device (M) 12 or the second radio device (M) 16 write. In the following description, when the first radio 12 or the second radio 16 functions as a slave radio, the first radio (S) 12 or the second radio (S) 16 write.

  For example, the control unit 20 includes a processor such as a CPU (Central Processing Unit). The control unit 20 determines which of the first radio device 12 and the second radio device 16 functions as a master radio device or a slave radio device.

  The mobile station 30 is mounted on a moving body such as a train or an automobile, and outputs information provided from the server device 40 to an occupant or the like. The mobile station 30 may be a general-purpose computer such as a mobile phone, a tablet terminal, or a personal computer. The mobile station 30 includes a mobile station radio 32. The mobile station radio 32 communicates with the base station 10 by radio using the antenna 34. The mobile station radio 32 functions as a slave radio. When the mobile station 30 is located within the communicable area 25 of the base station 10, the mobile station 30 can receive information provided from the server device 40 by wireless communication with the corresponding base station 10.

  The server device 40 is a device that provides various information in response to a request from the mobile station 30. When the mobile station 30 includes a position specifying device such as GPS (Global Positioning System), the server device 40 receives the position of the mobile station 30 based on the position information uploaded from the mobile station 30, or the mobile station 30 The position of the mobile station 30 is estimated based on which base station 10 communicates with. Thereby, the server device 40 provides the mobile station 30 with information such as the position of the mobile station 30 and the distance between the plurality of mobile stations 30.

  The normal operation of each base station 10 described above will be described with reference to FIG. In the example of FIG. 2, in all of the base stations 10A to 10D, the first wireless device 12 functions as a master wireless device, and the second wireless device 16 functions as a slave wireless device. In FIG. 2, the base station 10E is omitted.

  In the example of FIG. 2, when providing the information that the server device 40 has to the mobile station 30, first, the control unit 20 </ b> A of the base station 10 </ b> A receives information from the server device 40. The control unit 20A transmits the received information to the second radio (S) 16B of the base station 10B using the first radio (M) 12A.

  In the base station 10B, the information received by the second radio device (S) 16B is transmitted to the second radio device (S) 16C of the base station 10C by the first radio device (M) 12B. Further, in the base station 10C, the information received by the second radio device (S) 16C is transmitted to the second radio device (S) 16D of the base station 10D by the first radio device (M) 12C, and the mobile station. 30. Thereby, the information which the server apparatus 40 has is received by the base station 10D and the mobile station 30.

  With reference to FIG. 3 and FIG. 4, an outline of an operation for recovering communication when the first radio (M) 12C of the base station 10C fails will be described. FIG. 3 is a diagram illustrating a state in which the first radio (M) 12C of the base station 10C has failed. FIG. 4 is a diagram illustrating a state of each functional configuration after the failure of the first radio (M) 12C of the base station 10C. 3 indicate a communication state between the base stations 10 before the failure, and a solid arrow indicates a communication state between the base stations 10 after the failure. Also, a broken line indicating wireless communication in FIG. 4 indicates a communication state between the base stations 10 before the failure, and a solid line indicating wireless communication indicates a communication state between the base stations 10 after the failure.

  When the first radio (M) 12C of the base station 10C breaks down, first, the first radio (M) 12B of the base station 10B receives radio waves from the first radio (M) 12C of the base station 10C. Is detected (described later), and the control unit 20B of the base station 10B notifies the base station 10C to that effect. Similarly, the first radio (M) 12D of the base station 10D detects that the radio wave from the first radio (M) 12C of the base station 10C has been interrupted, and the control unit 20D of the base station 10D This may be notified to the base station 10C.

  Not limited to this, the control unit 20C of the base station 10C periodically polls the first wireless device 12C and the second wireless device 16C, thereby causing a failure of the wireless device. A failure of one wireless device 12C (M) may be detected.

  Due to this failure, the communication between the base station 10C and the base station 10D that has been performed is interrupted. However, the control unit 20C of the base station 10C stops the operation of the first radio (M) 12C of the base station 10C, and changes the setting of the second radio (S) 16C to the master radio. Then, the control unit 20C instructs the second radio (M) 16C of the base station 10C to establish a communication link with the second radio (S) 16D. In response, the communication link between the base station 10D and the base station 10C is restored.

  On the other hand, when the second radio device (S) 16C is changed to the master radio device, the communication link between the base station 10C and the base station 10B is canceled, but the control unit 20C Instructs the second radio (M) 16C of the base station 10C to establish a communication link with the second radio (S) 16B. In response, the communication link between the base station 10C and the base station 10B is resumed.

  FIG. 5 is a flowchart showing a flow of failure detection processing of the base station 10 executed by the control unit 20. First, the control unit 20 stands by until a failure of the master radio device of the base station 10 is detected (step S100). FIG. 6 is a diagram for explaining a technique for detecting a failure of a master radio device. In FIG. 6, the control unit 20B of the base station 10B detects the failure of the first radio (M) 12C of the base station 10C and notifies the base station 10C of the detection of the failure. Here, although the master wireless devices cannot communicate with each other, the received power of signals transmitted by other master wireless devices can be monitored.

  The control unit 20B of the base station 10B that detects the failure detects the received power of the signal transmitted by the first radio (M) 12C of the base station 10C via the first radio (M) 12B. To do. For example, when the reception power of the signal transmitted from the first radio (M) 12C of the base station 10C is equal to or less than a predetermined value, the control unit 20B has a failure in the first radio (M) 12C of the base station 10C. It determines that there is, and notifies that it is out of order according to the determination result. This notification is made via a communication link established between the first radio (M) 12B and the second radio (S) 16C before the master radio fails.

  Upon receiving the notification, the control unit 20C of the base station 10C detects the failure of the first radio (M) 12C of the base station 10C and sets the second radio (S) 16C as the master radio. change. Further, the detection of the failure of the master radio device of another base station 10 may be performed in two or more base stations 10 apart from each other. In this case as well, a notification that a failure has been detected may be sent from the base station 10 that is two or more away to the base station 10 in which the master radio device has failed.

  When the failure of the master radio is detected, the control unit 20 replaces the first radio 12 that has functioned as the master radio with the second radio 16 that has functioned as the slave radio. The setting is changed to the machine (step S102). In the example of FIG. 4, the control unit 20C of the base station 10C newly changes the setting of the second radio device 16C to the master radio device instead of the first radio device 12C.

  Next, the control unit 20 instructs the second radio device (M) 16 of the base station 10 to establish a communication link with the slave radio device of the adjacent base station 10. (Step S104). In the example of FIG. 4, the control unit 20C is adjacent to the second radio device (M) 16C of the own base station 10C and the second radio device (S) 16D of the adjacent base station 10D. A communication link is established with both the second radio equipment (S) 16B of the base station 10B on the other side.

  As described above, the control unit 20 of each base station 10 includes the first radio unit when the first radio unit 12 functions as a master radio unit and the second radio unit 16 functions as a slave radio unit. When 12 failures are detected, the second radio 16 is caused to function as a master radio.

  FIG. 7 is a flowchart showing a flow of a failure detection process of another base station 10 executed by the control unit 20. In this flowchart, as an example, processing executed by the base station 10B or the base station 10D will be described. First, the control units 20B and 20D stand by until a failure of the master radio device of the adjacent base station 10C is detected (step S120).

  When detecting the failure of the master radio of the adjacent base station 10C, the control unit 20B or the control unit 20D establishes a communication link between the slave radio of the base station 10B or 10D and the master radio where the failure is detected. Is determined (step S122).

  When a communication link is established between the slave radio of the base station 10 and the master radio where the failure is detected, the control unit 20D sends the master radio to the slave radio of the base station 10D. Control is performed so as to wait until a communication link is established with the master radio whose setting has been newly changed in the base station 10C where the failure is detected (step S124).

  If a communication link has not been established between the slave radio of the base station 10 and the master radio where the fault is detected, the control unit 20B detects a fault in the slave radio of the base station 10B. The base station 10C thus controlled is controlled to wait until a communication link is established with the newly set master radio (step S126). Further, the control unit 20B instructs the master radio device of the own base station 10B to establish a communication link with the slave radio device of the adjacent base station 10A (step S128).

  As described above, the base station 10 adjacent to the base station 10 including the failed master radio detects the failure of the master radio of the adjacent base station 10, detects the detection result, and the base station 10 having the failed radio. Based on the state of the wireless device, the wireless device of the own base station 10 is controlled to wait until the communication with the base station 10 adjacent to the own base station 10 is restored. As a result, the communication with the adjacent base station 10 in which the master radio device has failed can be quickly recovered. In addition, as illustrated in FIG. 8, in the adjacent base station 10 on the opposite side to the base station 10 that has failed, a communication propagation mechanism is used to control the radio of the base station 10 so as to wait until communication is restored. Can be recovered. In FIG. 7, the adjacent base station 10 of the failed base station 10 has been described as being in a standby state, but the master base station setting change may be pushed from the failed base station side.

  FIG. 8 is a flowchart showing a flow of a failure detection process performed by the control unit 20 for two or more base stations 10 separated from each other. In this flowchart, as an example, processing executed by the base station 10A will be described. First, the control unit 20A waits until it detects a failure of the master radio of the base station 10C that is two or more away (step S140). When detecting a failure of the master radio of the base station 10C that is two or more away, the control unit 20A establishes a communication link between the slave radio of the base station 10A and the master radio of the adjacent base station 10B It is determined whether or not it has been performed (step S142).

  When the communication link is not established between the slave radio of the base station 10A and the master radio of the adjacent base station 10B, the control unit 20A newly sets the slave radio of the adjacent base station 10B. It is detected that a communication link has been established with the changed master radio (step S144). FIG. 9 is a diagram illustrating an example when a communication link is not established between the slave radio of the base station 10 and the master radio of the adjacent base station 10. In FIG. 9, before the failure of the first radio (M) 12C of the base station 10C, the second radio (S) of the base station 10B adjacent to the first radio (M) 12A of the base station 10A. A communication link is established with 16B, and a communication link is established between the first radio (M) 12B of the base station 10B and the second radio (S) 16C of the adjacent base station 10C. Shall be.

  For example, after detecting a failure of the first radio 12C of the base station 10C, the control unit 20A detects the second radio (S) 16B of the base station 10B and the first radio (M) of the base station 10A. That the communication link between the second radio device (S) 16B of the base station 10B and the second radio device (M) 16C of the base station 10C has been established by the disconnection of the communication link with 12A. To detect. Further, for example, the control unit 20B temporarily causes the second radio device (S) 16B to communicate with the first radio device (M) 12A of the base station 10A, whereby the second radio device of the base station 10B. (S) You may notify that the communication link was established between 16B and the 2nd radio | wireless machine (M) 16C of 10 C of base stations.

  Next, the control unit 20A waits until the communication link is established by the second radio (M) 12B of the adjacent base station 10B with respect to the second radio (S) 16A of the own base station 10A. To control. (Step S146). In the example of FIG. 9, the control unit 20B controls to establish a communication link between the second radio (S) 16A of the base station 10A and the first radio (M) 12B of the base station 10B. To do. Note that before the communication link is established between the second radio (S) 16A and the first radio (M) 12B, the second radio (S) 16A of the base station 10A and others When a communication link has been established between the master radio device of the adjacent base station 10, the control unit 20 </ b> A connects the first radio device (M) 12 </ b> A with the slave radio devices of the other adjacent base station 10. You may control to establish a communication link between them.

  When a communication link has been established between the slave radio of the base station 10A and the master radio of the adjacent base station 10B, the control unit 20A newly sets the slave radio of the adjacent base station 10B. It is detected that a communication link has been established with the master radio device that has been made (step S148). FIG. 10 is a diagram illustrating an example of a case where a communication link is established between the slave radio of the base station 10A and the master radio of the adjacent base station 10B. In FIG. 10, before the failure of the first radio (M) 12C of the base station 10C, the first radio (M) 12B of the base station 10B adjacent to the second radio (S) 16A of the base station 10A. A communication link has been established between the second radio device (S) 16B of the base station 10B and the first radio device (M) 12C of the adjacent base station 10C. Shall. In this case, the control unit 20A establishes a communication link between the second radio device (S) 16B of the adjacent base station 10B and the second radio device (M) 16C of the newly changed base station 10C. Detect that is established.

  Thus, even when a failure occurs in two or more base stations 10A, the control unit 20A of the base station 10A is controlled by the failure of the base station 10C two or more away and the failure. Detect the status of the communication link. Further, the control unit 20A of the base station 10A controls the radio of the base station 10A so that a communication link is established with the adjacent base station 10B according to the detection result. As a result, communication of the wireless communication system 1 can be quickly recovered and communication can be maintained.

  When the wireless communication system 1 according to the first embodiment described above detects a failure of the first wireless device 12 functioning as a master wireless device, the control unit 20 of the base station 10 having the failed wireless device The second radio device 16 is changed as a master radio device, and communicates with the slave radio device of the adjacent base station 10. In addition, when the slave radio of the base station 10 is communicating with a failed master radio of the adjacent base station 10, the adjacent base station 10 becomes a master communication device instead of the failed master communication device. In addition, it waits until a communication link is established by the second radio 16 and makes the slave radio of the other adjacent base station 10 communicate with the master radio of the own base station 10. Further, when the slave radio of the base station 10 is not communicating with the failed master radio of the adjacent base station 10, the adjacent base station 10 replaces the failed master communication with the master communication It waits until a communication link is established by the second wireless device 16 that has become. As a result, the base station 10 can be used efficiently, and even when a failure occurs in the base station, the disconnected communication can be recovered and maintained.

(Second Embodiment)
Hereinafter, the second embodiment will be described. Here, the difference from the first embodiment will be mainly described, and description of functions and the like common to the first embodiment will be omitted. In the first embodiment, the case where the master radio device has failed has been described, but in this embodiment, the case in which the slave radio device has failed will be described.

  FIG. 11 is a diagram illustrating a state in which the second radio device (M) 16C of the base station 10C has failed. FIG. 12 is a flowchart illustrating a flow executed by the control unit 20 when the slave radio device fails. The operation of the wireless communication system 1 will be described with reference to FIGS. 11 and 12. As shown in FIG. 11, before the failure of the second radio (M) 16C of the base station 10C, the first radio (M) 12A of the base station 10A and the second radio of the adjacent base station 10B A communication link is established with the radio (S) 16B, and between the first radio (M) 12B of the base station 10B and the second radio (S) 16C of the adjacent base station 10C. A communication link has been established. In this case, a case is assumed where the second radio (S) 16C of the base station 10C has failed.

  In this flowchart, as an example, processing executed by the base station 10B or the base station 10D will be described. First, the base station 10B adjacent to the base station 10C in which the slave radio device has failed waits until it detects a failure in the slave radio device in the base station 10C (step S200). For example, the control unit 20B detects that the first radio (M) 12B of the base station 10B is disconnected from the second radio (S) 16B of the base station 10C, and the base station 10B When the failure of the first wireless device (M) 12B is not detected, it is detected that the second wireless device (S) 16C of the base station 10C is broken. When a failure is detected, the control unit 20B of the base station 10B uses the communication link between the slave radio of the base station 10B and the master radio of the base station 10C having the failed radio to The base station 10C is notified of the failure of the radio (step S202).

  Next, the control unit 20C of the base station 10C having the failed slave radio device waits until it detects a failure of the slave radio device (step S220). The failure detection may be performed in the control unit 20C of the base station 10C. In this case, the control unit 20C cannot communicate with the first radio device (S) 12B of the adjacent base station 10B, and detects a failure of the first radio device (M) 12B of the adjacent base station 10B. If not, it may be determined that the second radio (S) 16C of the base station 10C is out of order.

  When the failure is detected, the control unit 20C controls the master radio of the base station 10C so as to establish a communication link with the slave radio of the adjacent base station 10B (step S222). Next, the control unit 20B controls the slave radio device of its own base station 10B to wait until a communication link is established by the master radio device of the base station 10C having the failed slave radio device (step). S204). Next, the control unit 20B controls the master radio device of the base station 10B so as to establish a communication link with the slave radio device of the other adjacent base station 10A opposite to the base station 10C (step S206).

  When the wireless communication system 1 according to the second embodiment described above detects a failure of the slave wireless device, the base station 10 having the failed slave wireless device receives the failed slave as the master wireless device of the own base station 10. Communication is started with the slave radio of the adjacent base station 10 with which the radio was communicating. Also, in this case, the adjacent base station 10 with which the failed slave radio was communicating is communicated with the slave radio of the own base station 10 by the master radio of the base station 10 having the failed slave radio. Accept to come. Further, the adjacent base station 10 causes the master radio device of the own base station 10 to start communication with the slave radio device of the base station 10 that has been communicating with the slave radio device of the own base station 10. As a result, the base station 10 can be used efficiently, and even when a failure occurs in the base station 10, the disconnected communication can be recovered and maintained.

(Third embodiment)
Hereinafter, a third embodiment will be described. Here, the difference from the first embodiment will be mainly described, and description of functions and the like common to the first embodiment will be omitted. In the first embodiment, the state in which the base stations 10 are installed in series and communicated has been described. In the present embodiment, a case in which the base station 10 branches will be described.

  FIG. 13 is a diagram illustrating a state in which the first radio (M) 12C of the base station 10B has failed when the base station 10 branches. In the example of FIG. 13, before the failure of the first radio (M) 12B, the first radio (M) 12B of the base station 10B and the second radio (S) 16A of the base station 10A, It is also assumed that a communication link has been established with the second radio device (S) 16C of the base station 10C. It is assumed that a communication link is established between the second radio (S) 16B of the base station 10B and the first radio (M) 12D of the adjacent base station 10D. Thus, the wireless communication system 1 can communicate even when one base station 10 branches into a plurality of base stations 10.

  When the first wireless device (M) 12B fails, the control unit 20B newly changes the setting of the second wireless device 16B to the master wireless device instead of the first wireless device 12B. In this case, the control unit 20B controls the newly set master radio device so as to newly establish a communication link with the second radio device (S) 16 of the adjacent base stations 10A, 10C, and 10D. The control units 20A, 20C, and 20D establish communication links to the slave radios of their own base stations 10A, 10C, and 10D by the master radio whose settings are newly changed in the base station 10B where the failure is detected. Control to wait until. When the communication link is established by the master radio of the base station 10B, the slave radios of the base stations 10A, 10C, and 10D accept communication with the master radio of the base station 10B. Thereby, the second radio (M) 16B is connected to the second radio (S) 16A of the base station 10A, the second radio (S) 16C of the base station 10C, and the second radio (S) 16C of the base station 10D. Communication is performed with the radio (S) 16D.

  FIG. 14 is a diagram illustrating a state in which the second radio device (S) 16C of the base station 10B has failed when the base station 10 is branched. When the second radio device (S) 16B fails, the control unit 20B controls the second radio device (S) 16D of the adjacent base station 10D to newly establish a communication link. The control unit 20D controls the slave radio device of its own base station 10D to wait until a communication link is established with the master radio device of the base station 10B in which the failure is detected. When the communication link is established by the master radio of the base station 10B, the slave radio of the base station 10D accepts communication with the master radio of the base station 10B. Thereby, the first radio (M) 12B communicates with the second radio (S) 16D of the base station 10D.

  In the wireless communication system 1 according to the third embodiment described above, when communication branches from one base station 10 to a plurality of base stations 10, a radio of the base station 10 that becomes a branching branch point fails. However, a communication link is established with respect to the slave radios of the other base stations 10 so that the control unit 20 of the base station 10 serving as the branch point recovers communication. Further, the slave radios of the other base stations 10 wait until the communication link is established by the master radio of the base station 10 that becomes the branch point, and when the communication link is established, accept the communication link and become the master. Communicate with the radio. As a result, the base station 10 can be used efficiently, and even when a failure occurs in the base station 10, the disconnected communication can be recovered and maintained.

  In each of the above embodiments, the base station 10 may detect a failure of a master radio device of another base station 10 using a Beacon frame. The Beacon frame includes identification information of the base station 10 that is the transmission source of the Beacon frame. For example, master wireless devices can transmit and receive a Beacon frame. For example, the master radio device adds the Beacon frame of its own base station 10 to the received Beacon frame and transmits it to the adjacent base station 10. Further, the base station 10 included in the wireless communication system 1 and the identification information included in the Beacon frame are stored in association with the storage unit of the control unit 20. The control unit 20 compares the identification information included in the received Beacon frame with the identification information of the base station 10 stored in the storage unit, and receives the Beacon frame including the identification information of a certain base station 10. If not, it is determined that a certain base station 10 has failed. As described above, a failure of another base station 10 may be detected by transmitting and receiving a Beacon frame including the identification information of the base station 10 between the base stations 10.

  According to at least one embodiment described above, a base station 10 having two or more radios including the first radio 12 and the second radio 16 and a control unit 20 that controls the two or more radios. In the radio communication system 1 including a plurality of radio stations, each radio station of each base station 10 leads a slave radio apparatus of another base station 10, and a master radio apparatus capable of communicating with a mobile station 30 different from the base station 10, The control unit 20 of each base station 10 is led by the master radio of the other base station 10 and functions as one of the slave radios that communicate with the master radio of the other base station 10. When the failure of the first radio 12 of the base station 10 is detected when the second radio 12 functions as a master radio and the second radio 16 functions as a slave radio, the second radio Master the radio 16 By function as a line machine can be provided with utilizing the base station 10 effectively, the wireless communication system 1 can also recover communication when a fault in the base station 10 occurs.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Wireless communication system, 10A-10E ... Base station, 12A-12E ... 1st radio | wireless machine, 16A-16E ... 2nd radio | wireless machine, 20A-20E ... Control part

Claims (5)

A wireless communication system comprising a plurality of base stations having two or more wireless devices including a first wireless device and a second wireless device and a control unit that controls the two or more wireless devices,
Each radio at each base station
While leading slave radios of other base stations, a master radio that can communicate with a mobile station different from the base station,
Led by a master radio of another base station, functioning as one of the slave radios communicating with the master radio of the other base station,
The control unit of each base station has the first radio of the base station when the first radio functions as the master radio and the second radio functions as the slave radio. If a radio failure is detected, the second radio functions as the master radio ,
When the setting is changed so that the second wireless device functions as the master wireless device, the base station of the partner with which the second wireless device whose setting has been changed to the master wireless device is communicating as a slave wireless device In place of the first radio that functions as the master radio, the second radio that functions as the slave radio of the counterpart base station is changed to the master radio. Let 2 radios communicate,
Wireless communication system. The control unit of the counterpart base station is different from the counterpart base station that is communicating with the second radio functioning as a slave radio of the counterpart base station. Causing a second wireless device functioning as a slave wireless device of a previous base station to communicate a first wireless device functioning with a master wireless device of the counterpart base station;
The wireless communication system according to claim 1 . When the setting is changed so that the second radio functions as the master radio, the control unit is configured as a slave radio of the counterpart base station with which the failed first radio was communicating. Causing the functioning second radio to communicate with the second radio whose setting has been changed to the master radio;
The wireless communication system according to claim 1 or 2 . A wireless communication system comprising a plurality of base stations having two or more wireless devices including a first wireless device and a second wireless device and a control unit that controls the two or more wireless devices,
Each radio at each base station
While leading slave radios of other base stations, a master radio that can communicate with a mobile station different from the base station,
Led by a master radio of another base station, functioning as one of the slave radios communicating with the master radio of the other base station,
The control unit of each base station is configured such that a first radio unit among the two or more radio units functions as the master radio unit, and a second radio unit among the two or more radio units functions as the slave radio unit. When the failure of the second radio of the base station is detected, the second radio that functions as the slave radio in the partner base station that has led the failed slave radio Causing a radio to communicate with the first radio;
Wireless communication system. The control unit of the counterpart base station is different from the counterpart base station that is communicating with the second radio functioning as a slave radio of the counterpart base station. Causing a second wireless device functioning as a slave wireless device of a previous base station to communicate a first wireless device functioning with a master wireless device of the counterpart base station;
The wireless communication system according to claim 4 .

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