Wireless communication system and wireless communication method

Abstract

To provide a radio communication system and a radio communication method configured to form a bypass when a base station or a master unit of a communication carrier fails in an antenna-distributed system, to continue a communication service of the communication carrier, thereby improving the convenience.SOLUTION: In a radio communication system and a radio communication method, a local communication system includes a local core network 11 connected to a core network 1 of a communication carrier, a local base station 21 connected to the local core network 11, and a local master unit 31 connected to the local base station 21 and a hub device 4. The hub device 4 connects, when a communication failure occurs between a base station 2 and a master unit 3 of the communication carrier, the core network 1 of the communication carrier to the local core network 11, to switch connection so as to bypass the communication of the communication carrier via the local communication system.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a wireless communication system and a wireless communication method, and more particularly to a wireless communication system and a wireless communication method that can form a detour route to continue communication services when a failure occurs in communication between a base station of a telecommunications carrier and a master unit. [Background technology]

[0002] Description of the Prior Art 5G / LTE (5G (5th Generation) or LTE (Long Term Evolution)) is known as an example of a wireless network standard. 5G / LTE networks are more stable than wireless local area networks (LANs). 5G / LTE networks are provided by MNOs (Mobile Network Operators), but 5G / LTE networks can also be built by entities other than MNOs.

[0003] For this reason, some companies are beginning to consider introducing 5G / LTE networks within their companies. Instead of 5G, a 4G (4th Generation) network is also acceptable. Such local networks are called local 5G or private LTE.

[0004] Additionally, multi-carrier DAS (Distributed Antenna Systems) are becoming more common in enclosed spaces such as inside buildings and tunnels. Multi-carrier DAS transmits and receives radio waves from multiple carriers as an infrastructure sharing system.

[0005] [Configuration of a conventional wireless communication system: Figure 8] A conventional wireless communication system using a distributed antenna system will be described with reference to Fig. 8. Fig. 8 is an explanatory diagram showing the configuration of a conventional wireless communication system. As shown in Figure 8, a conventional wireless communication system is an antenna extension system in which communication devices for each of multiple mobile communication carriers (communication carriers) and a shared terminal that transmits and receives wireless signals to and from mobile stations are connected via an optical signal aggregation device (HUB) 40.

[0006] Specifically, in a conventional wireless communication system, master units (MU) 30a to 30d (sometimes referred to as master unit 30 when not distinguishing between the individual units) of telecommunications carrier (A), telecommunications carrier (B), telecommunications carrier (C), and telecommunications carrier (D) are connected to multiple remote units (RU) 50 by a centralized device (HUB) 40. The base stations 30 of each telecommunications carrier are each connected to a base transceiver station (BTS) 20a to 20d (sometimes referred to as base station 20), and the base stations 20a to 20d are further connected to core networks 10a to 10d (sometimes referred to as core network 10), respectively.

[0007] Core networks 10a to 10d are backbone communication networks of telecommunications carrier (A), telecommunications carrier (B), telecommunications carrier (C), and telecommunications carrier (D), respectively, and are equipped with gateways, routers, switches, etc. to perform switching control, forwarding control, etc. The base stations (BTS) 20a to 20d are base station devices (MNO base stations) of each telecommunications carrier, and are connected to the core networks 10a to 10d via optical cables, respectively.

[0008] The master units (MUs) 30a to 30d are master units of the respective telecommunications carriers, and are connected to the base station 20 by coaxial cables, and are also connected to the aggregation device (HUB) 40 by optical cables. The master units 30 convert wireless signals from the base stations 20 into optical signals and output them to the aggregation device 40, and convert optical signals from the aggregation device 40 into wireless signals and output them to the base station 20. The coaxial cables connecting each master unit 30 and base station 20 are provided in the number equal to the number of bands of the radio signal.

[0009] The aggregation device (HUB) 40 is a device that connects the base stations 30a to 30d of each telecommunications carrier to multiple slave stations 50 via optical cables, and receives optical signals from the base stations 30a to 30d, integrates them, aggregates them, and distributes them to the multiple slave stations 50. It also receives optical signals from the multiple slave stations 50, separates them into wireless signal bands, and outputs them to the corresponding base stations 30a to 30d.

[0010] The slave devices 50 are wireless communication devices equipped with directional antennas, and are installed, for example, in various locations within a building (ceiling, walls, floors, etc.), and perform wireless communication with mobile stations (not shown). The slave devices 50 are connected to the aggregation device 40 via optical cables, convert optical signals from the aggregation device 40 into wireless signals, and output the signals from the antenna. The slave devices 50 also convert wireless signals received by the antenna into optical signals and output the signals to the aggregation device 40. By using a DAS shared by multiple carriers, mobile stations of multiple carriers within a building or the like can send and receive signals via the shared handset 50.

[0011] The operation of a conventional wireless communication system will now be briefly described. In the uplink, the wireless signal received by the slave device 50 is converted into an optical signal and optically transmitted to the aggregation device 40, which separates it by band, aggregates it by telecommunications carrier, and transmits it to the corresponding master device 30. The master device 30 then converts the optical signal into an electrical signal and transmits it to the base station 20 via a coaxial cable, where it is converted back into an electrical signal and output to the core network 10.

[0012] In the downlink, an optical signal from the core network 10 is sent to the base station 20, converted into an electrical signal at the base station 20, and transmitted to the base station 30 via a coaxial cable for each band, where it is converted back into an optical signal and sent to multiple sub-units 50 via the aggregation device 4, and then sent wirelessly from each sub-unit 50.

[0013] [If a problem occurs with the carrier's equipment] In a conventional wireless communication system, if a problem occurs in communication between a base station 20 of a telecommunications carrier and a base unit 30, there is no alternative route, and therefore the communication service of the telecommunications carrier is interrupted.

[0014] [Related Technology] Incidentally, a conventional technology for a wireless communication system is disclosed in Japanese Patent Laid-Open Publication No. 2014-187450 entitled "Optical Transmission Device" (Patent Document 1). Patent Document 1 describes an optical transmission device that can reduce the optical transmission capacity while satisfying the signal standards when optically transmitting using multiple shared frequencies. [Prior art documents] [Patent documents]

[0015] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-187450 Summary of the Invention [Problem to be solved by the invention]

[0016] As described above, in conventional wireless communication systems, if a failure occurs in communication between a telecommunications carrier's base station and a parent device, even if the aggregation device and child devices are operating normally, the telecommunications carrier's communication services will be interrupted and the service cannot be resumed until recovery, which is inconvenient.

[0017] Furthermore, Patent Document 1 does not mention that the local network is connected to a DAS shared by carriers, and in the event of a malfunction in the base station or parent device of a carrier, the local network is used as a detour to connect to the core network of the carrier that has the malfunction.

[0018] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a wireless communication system and a wireless communication method that, in a system using DAS, when a failure occurs in a base station or parent device of a telecommunications carrier, can form a detour route to continue the communication service of the telecommunications carrier, thereby improving convenience. [Means for solving the problem]

[0019] The present invention, which aims to solve the problems of the above-mentioned conventional examples, is a wireless communication system comprising an aggregation device that connects a base station and a slave station in a communication system of a telecommunications carrier, and is characterized in that the local communication system has a local core network that connects to the core network of the telecommunications carrier, a local base station that connects to the core network, and a local base station that connects to the base station and the aggregation device, and when a communication failure occurs between the telecommunications carrier's base station and the base station, the aggregation device connects the telecommunications carrier's core network and the local core network, and controls the connection to switch so as to form a detour route for the telecommunications carrier's communication path in the local communication system.

[0020] Furthermore, in the wireless communication system of the present invention, the wireless communication system uses a distributed antenna system, and the communication systems of the telecommunications carriers are provided for each of the plurality of carriers, and when the aggregation device receives from the slave device uplink data of the communication system of the telecommunications carrier where a failure has occurred, Uplink The local core network remaps the data for a detour route of the local communication system and outputs it to the local base station, and when the local core network receives uplink data from the local base station, it outputs it to the core network of the telecommunications carrier, and when it receives downlink data from the core network of the telecommunications carrier, it remaps the data for a detour route of the local communication system and outputs it to the local base station.

[0021] Furthermore, in the wireless communication system of the present invention, the local base station and the local master unit degenerate the communication path they are using and assign it to an alternative path.

[0022] Furthermore, in the wireless communication system of the present invention, a monitoring server is connected to the aggregation device, and the monitoring server detects the occurrence of a communication failure and notifies the local communication system. Telecommunications carriers The present invention is characterized in that it instructs the switching of the connection so as to form a detour route for the communication path.

[0023] Furthermore, in the wireless communication system of the present invention, the local communication system has a standby band for transmitting data of a detour route in the event of a failure, in addition to the wireless band that it maintains.

[0024] The present invention also provides a communication method in a wireless communication system that includes a local communication system having an aggregation device that connects a base station and a slave station in a communication system of a telecommunications carrier, a local core network that connects to the core network of the telecommunications carrier, a local base station that connects to the core network, and a local base station that connects to the base station and the aggregation device, characterized in that when a communication failure occurs between the telecommunications carrier's base station and the base station, the aggregation device connects the telecommunications carrier's core network and the local core network, and controls the connection to switch so as to form a detour for the telecommunications carrier's communication path in the local communication system. [Effects of the Invention]

[0025] According to the present invention, a wireless communication system is provided which includes an aggregation device that connects a base station and a handset in a communication system of a telecommunications carrier, the local communication system having a local core network connected to the core network of the telecommunications carrier, a local base station connected to the core network, and a local base station connected to the base station and the aggregation device, and the aggregation device is a wireless communication system that, when a communication failure occurs between the telecommunications carrier's base station and the base station, connects the telecommunications carrier's core network and the local core network and controls the connection to form a detour for the telecommunications carrier's communication path in the local communication system.Therefore, when a communication failure occurs between the telecommunications carrier's base station and the base station, the communication of the telecommunications carrier can be diverted to the local communication system, and communication between the base station and the handset can be carried out, thereby enabling communication services to be continued and improving convenience.

[0026] Furthermore, according to the present invention, in the wireless communication system, a monitoring server is connected to the aggregation device, and the monitoring server detects the occurrence of a communication failure and instructs the local communication system to switch the connection so as to form a detour route for the communication path of the communication carrier. Therefore, the monitoring server monitors the operational status of the communication system of the communication carrier and the local communication system, and when it detects the occurrence of a failure in the communication system of the communication carrier, it can form a detour route, thereby improving convenience.

[0027] In addition, according to the present invention, there is provided a communication method in a wireless communication system comprising an aggregation device that connects a base station and a handset in a communication system of a telecommunications carrier, a local communication system having a local core network connected to the core network of the telecommunications carrier, a local base station connected to the core network, and a local base station connected to the base station and the aggregation device, in which, when a communication failure occurs between the telecommunications carrier's base station and the base station, the aggregation device connects the telecommunications carrier's core network to the local core network and controls switching of the connection to form a detour for the telecommunications carrier's communication path in the local communication system.Therefore, when a communication failure occurs between the telecommunications carrier's base station and the base station, the communication of the telecommunications carrier can be diverted to the local communication system, and communication between the base station and the handset can be carried out, thereby enabling communication services to be continued and improving convenience. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is an explanatory diagram showing the configuration of a wireless communication system. [Figure 2] FIG. 10 is an explanatory diagram showing an overview of mapping in an aggregation device. [Figure 3] FIG. 2 is an explanatory diagram showing the configuration of a parent device and an aggregation device. [Figure 4] 10 is a flowchart showing a process performed when an abnormality is detected in the NMO master unit. [Figure 5] 10 is a flowchart showing the processing in the aggregation device 4. [Figure 6] 10 is a flowchart showing the processing in a local base station 21. [Figure 7] 10 is a flowchart showing processing in a local core network 11. [Figure 8] FIG. 1 is an explanatory diagram showing the configuration of a conventional wireless communication system. DETAILED DESCRIPTION OF THE INVENTION

[0029] An embodiment of the present invention will be described with reference to the drawings. [Outline of the embodiment] A wireless communication system (this wireless communication system) according to an embodiment of the present invention is a wireless communication system comprising an aggregation device that connects a base station and a slave station in a communication system of a telecommunications carrier, and comprises a local communication system having a local core network connected to the core network of the telecommunications carrier, a local base station connected to the local core network, and a local base station connected to the local base station and aggregation device.When a communication failure occurs between the telecommunications carrier's base station and the base station, the aggregation device connects the core network of the telecommunications carrier and the local core network and controls switching the connection so as to detour the telecommunications carrier's communications via the local communication system.When a communication failure occurs between the telecommunications carrier's base station and the base station, a detour route is formed, allowing communication services to continue and improving convenience.

[0030] Moreover, a wireless communication method according to an embodiment of the present invention is a wireless communication method in this wireless communication system.

[0031] [Configuration of a wireless communication system according to an embodiment: Figure 1] The configuration of this wireless communication system will be described with reference to Fig. 1. Fig. 1 is an explanatory diagram showing the configuration of this wireless communication system. As shown in Figure 1, this wireless communication system uses a DAS (distributed antenna system) like the conventional wireless communication system shown in Figure 8, and is a wireless communication system in which master units (MUs) 3a to 3d (sometimes referred to as master units 3) of telecommunications carrier (A), telecommunications carrier (B), telecommunications carrier (C), and telecommunications carrier (D) are connected to multiple shared slave units (RUs) 50 via an aggregation device 4. The slave unit 50 has the same configuration and operates in the same manner as the conventional one.

[0032] Furthermore, this wireless communication system includes a local communication system connected to the aggregation device 4, and a master device (local master device) 31 of the local communication system is connected to the aggregation device 4 in the same manner as the master devices 3a to 3d of the communication carrier. Furthermore, this wireless communication system is configured to include a monitoring control server 6 connected to the aggregation device 4.

[0033] The base stations 3 of each telecommunications carrier are each connected to base stations (BTS) 2a to 2d (sometimes referred to as base station 2), and the base stations 2a to 2d are further connected to core networks (NW) 1a to 1d (sometimes referred to as core network 1), respectively. For convenience, a system including a core network 1, a base station 2, and a base station 3 for each telecommunications carrier will be referred to as a telecommunications carrier's communication system.

[0034] The local communication system includes a local core network (NW(L5G)) 11, a local base station 21, and a local base station 31. Here, the communication method of the local communication system is 5G, the same as that of the communication system of the telecommunications carrier. That is, this wireless communication system is an antenna distribution type system in which communication systems of multiple (four in this case) carriers and a local communication system are connected to multiple terminals 50 via aggregation device 4.

[0035] The features of this wireless communication system will now be described. In this wireless communication system, detouring optical cables 12a to 12d (sometimes referred to as detouring optical cables 12) are provided in advance to connect the local core network 11 with the core networks 1a to 1d of the respective telecommunications carriers.

[0036] Here, in this wireless communication system, communication is not performed using the detour optical cable 12 during normal operation, but if a failure occurs in communication between the base station 2 and the parent device 3 of the communication system of the telecommunications carrier, the core network 1 of the telecommunications carrier communicates with the local core network 11 via the detour optical cable 12. Communication via the detour optical cable 12 is started by an instruction from the aggregation device 4. Furthermore, when the aggregation device 4 receives communication data of the communication carrier in which the failure has occurred from the slave device 50, it outputs the communication data to the local master device 31 instead of the master device 3 of the communication carrier in which the failure has occurred. The switching of these communications will be described later.

[0037] The carrier's base station 2 and base unit 3 are connected by coaxial cables with the same number of radio signal bands as in the past. A feature of this wireless communication system is that the base station 2 and base unit 3 are equipped with control signal ports for sending and receiving control signals, and the base station 2 and base unit 3 are connected by a control line.

[0038] Then, a control signal is sent from the base station 2 to the parent unit 3, and the parent unit 3 monitors whether the control signal has been received normally.If the control signal has not been received normally, the parent unit 3 notifies the aggregation device 4 of the abnormality by sending a fault occurrence signal (abnormality flag) using a break contact or the like. If the control signal cannot be received normally, it is considered that a fault has occurred in the equipment of the base station 2 or in the transmission path, and the transmission and reception of radio signals cannot be carried out normally.

[0039] The monitoring server 6 is connected to the aggregation device 4 via a control line, receives and stores data on the operating status of each telecommunications carrier's communication system and fault occurrence signals from the aggregation device 4, and displays the operating status on a display unit so that it can be monitored. In particular, in this wireless communication system, when the monitoring server 6 detects that a failure has occurred in the communication system of a telecommunications carrier, it instructs the aggregation device 4 to divert the communication of the telecommunications carrier via the local communication system, as described below. The monitoring server 6 can also control (instruct) the aggregation device 4 to allocate (map) a band during detouring.

[0040] The aggregation device 4 operates in the same manner as conventional devices, and as a feature of this wireless communication system, when a failure occurs in communication between a telecommunications carrier's base station 2 and the parent device 3, it controls the telecommunications carrier's communication to be diverted via the local communication system.

[0041] As in the past, the aggregation device 4 stores band information (bandwidth and bandwidth) determined for each telecommunications carrier and local communication system, and during normal operation, in the uplink, the aggregation device 4 separates communication data received from the slave device 50 into each band, maps it to optical data, and transmits it to the corresponding master device 3. In the downlink, the aggregation device 4 receives and aggregates optical signals from a plurality of base units 3, remaps the signals, and transmits them to a plurality of slave units 50.

[0042] Furthermore, the aggregation device 4 of this wireless communication system stores in advance information on the band to be diverted to the local communication system when a failure occurs in the communication system of the telecommunications carrier, and when a failure occurrence signal (abnormality flag) is received from the master device 3, it performs control to divert communication data of the stored band from among the bands of the corresponding telecommunications carrier to the local communication system. This control will be described later. In order to perform this detouring transmission, if the local communication system is operating in an asynchronous or quasi-synchronous manner, it will be switched to operate synchronously with the communication system of the communication carrier.

[0043] [Overview of mapping in the aggregation device: Figure 2] An overview of band mapping (frequency mapping) in the aggregation device 4 of this wireless communication system will be explained using Figure 2. Figure 2 is an explanatory diagram showing an overview of mapping in the aggregation device, where (a) shows an example of mapping during normal operation and (b) shows an example of mapping when a failure occurs in Company A's communication system. Note that although the bandwidth actually differs for each band, they are shown as the same bandwidth to simplify the illustration. Figure 2 also shows the uplink from the aggregation device 4 to the parent device 4.

[0044] As shown in Figure 2(a), during normal operation, the local communication system (L5G) and the communication systems of each telecommunications carrier communicate using bands that have been assigned to them in advance. In the uplink, the aggregation device 4 separates the signals received from the slave devices 50 into bands, aggregates them for each communication carrier, maps them into optical signals, and transmits them to the corresponding master devices 3 . In the example of Figure 2, for example, Company A communicates using bands such as A3.4G, ..., A800, A700, etc. Among these, it is assumed that the A3.4G communication data is set to be diverted to the band of the local communication system.

[0045] If a failure occurrence signal is received from the base station 3a of company A, communication between the base station 3 of company A and the base station 2 becomes impossible, and all of company A's bands become unusable. Therefore, as shown in (b), the aggregation device 4 maps the communication data received from the slave device 50, which is of the preset A3.4G, to optical data so that it is inserted into the band (L5G) of the local communication system. This will create a detour for A3.4G in the local communications system.

[0046] In this case, instead of using the entire L5G band, part of it may be allocated for bypassing A3.4G. In addition, the local communication system may reserve a specific band for detour routes that is not used by any MNO as a standby band in advance, or may use the entire L5G band under normal circumstances and, when a detour route is formed, degenerate some of the L5G bandwidth and use it as the detour route. It is desirable to predetermine the bandwidth and allocation method to be allocated to the detour route and set them in the aggregation device 4 and each device in the local communication system.

[0047] In the downlink, the L5G data into which the A3.4G communication data has been inserted is aggregated together with communication data from other base units 3, mapped to an optical signal, and transmitted to the slave unit 50 in the same manner as before. At this time, the A3.4G communication data received by detouring is mapped to the original A3.4G band.

[0048] Since no failure occurs in the slave device 50, the mobile station of company A that transmits and receives radio signals to and from the slave device 50 can communicate as in normal times. Although only A3.4G is diverted here, if there is sufficient bandwidth in L5G, other routes such as A800 and A700 may also be diverted.

[0049] [Overview of detour route switching] Next, an outline of the operation when switching to a detour route will be described. When the aggregation device 4 receives a fault occurrence signal from the parent device 3 of Company A, it switches processing to transmit data in the pre-set band of Company A to the local parent device 31, and outputs a detour instruction to Company A's core network 1a to communicate via the detour route 12a. The detouring instruction is transmitted to the local core network 11 via the local base station 31 and the local base station 21, and is then transmitted from the local core network 11 to the core network 1a of Company A via the detouring optical cable 12a.

[0050] When Company A's core network 1a receives a detour instruction from the local core network 11, it configures the local core network 11 to communicate via the detour optical cable 12a, switches from the normal communication path to communication via the detour optical cable 12a, and sends a response (OK flag) to the local core network 11 indicating that the switch has been completed.

[0051] When the local core network 11 receives the response from the core network 1a of company A, it starts transmitting and receiving data to and from the core network 1a of company A via the detouring optical cable 12a. Furthermore, when a response from the core network 1 a of company A is received by the aggregation device 4 via the local base station 21 and the local base station 31 , the aggregation device 4 starts transmitting the data of company A to the local base station 31 . In this way, the operation of switching to the detour route is performed.

[0052] [Configuration and operation of the parent device and aggregation device for forming detour routes: Figure 3] Next, the configurations and operations of the telecommunications carrier's base station (MNO base station) 2, parent device (MNO parent device) 3, local parent device 31, and aggregation device 4, which are features of this wireless communication system, will be specifically explained using Figure 3. Figure 3 is an explanatory diagram showing the configurations of the parent device and aggregation device. Note that here, the MNO base station 2 and MNO parent device 3 will be explained using the base station 3a and parent device 3a of telecommunications carrier A as an example, but the same applies to communication systems of other telecommunications carriers.

[0053] As shown in FIG. 3, the base station 2a and the master unit 3a are provided with a control line connecting the control ports in addition to a coaxial cable for transmitting communication data for each band. The master unit 3a includes a wireless data conversion unit 32, an IO input determination unit 33, a data mapping unit , and an electrical / optical conversion unit .

[0054] The configuration of the master unit 3a and its operation in the downlink will be described. The wireless data conversion unit 32 of the master unit 3a outputs the data received via the coaxial cable to the data mapping unit 34 as Uplane. The IO input determination unit 33 determines the IO input at the control port, and when an abnormality occurs, outputs the information (abnormality flag) as a failure occurrence signal to the data mapping unit 34 on the Cplane for control signals.

[0055] The data mapping unit 34 maps the wireless data (Uplane) and the control data (Cplane) to a mapping such as CPRI (Common Public Radio Interface). The electrical / optical converter 35 converts the mapped electrical signal into an optical signal and sends it to the aggregation device 4. As a result, the wireless data and a failure occurrence signal (abnormality flag) are transmitted to the aggregation device 4.

[0056] Next, the configuration and operation of the aggregation device 4 will be described. The aggregation device 4 includes an optical / electrical conversion unit 41, a demodulation unit 42, an abnormality detection unit 43, a transmission data selection unit 44, an electrical / optical conversion unit 45, a U-plane separation / combination unit 46, and an optical / electrical conversion unit 47. Here, the abnormality detection unit 43 and the transmission data selection unit 44 function as a control unit that performs communication path switching processing.

[0057] The optical / electrical converter 41 converts the optical signal received via the downlink into an electrical signal. The demodulation unit 42 demodulates the received signal, separates the Cplane data and outputs it to the abnormality detection unit 43, and also outputs the Uplane data to the Uplane separation / combination unit 46. The abnormality detection unit 43 determines whether the separated Cplane data includes an abnormality flag, and outputs the result to the transmission data selection unit 44 together with information indicating which parent device sent the data (parent device 3a in this case).

[0058] Furthermore, the U-plane separation / combination unit 46 combines and compresses the U-plane data, and outputs the combined data to the optical / electrical conversion unit 47 . The optical / electrical converter 47 converts the electrical signal into an optical signal and transmits it to each slave unit 50 via an optical cable. Up to this point, the operation is downlink.

[0059] In the uplink, the optical / electrical converter 47 of the aggregation device 4 converts the optical signal received from the slave device 50 into an electrical signal and outputs it to the Uplane demultiplexing / combining unit 46 . The U-plane separation / combination unit 46 extracts U-plane data from the data received from the child device 50 and combines them.

[0060] The transmission data selection unit 44 performs band mapping in the uplink in accordance with the determination result from the abnormality detection unit 43. If the abnormality detection unit 43 determines that it has not received a fault occurrence signal (abnormality flag) from the parent device 3a, as shown in Figure 2(a), the Uplane data to be output to the parent device 3a and the local parent device 31 are mapped to respective predetermined bands and output to the optical / electrical conversion unit 45.

[0061] In other words, if there is no abnormality, data for the local base station 21 is selected as data to be transmitted to the local parent device 31, and data for the base station 2a is selected as data to be transmitted to the parent device 3a, and these are mapped and output to the optical / electrical conversion unit 45, respectively. The electrical / optical converter 45 converts the electrical signal into an optical signal and sends it to the master unit 3a and the local master unit 31. In Fig. 3, only the part that outputs to the local master unit 31 is shown.

[0062] Furthermore, if the abnormality detection unit 43 determines that a failure occurrence signal has been received from the parent device 3a, the transmission data selection unit 44 generates a transmission path switching notification to the local base station 21 in the Cplane to form a detour, as will be described later, and also generates a detour instruction to the core network 1a of the telecommunications carrier (A) where the failure occurred, and outputs it to the electrical / optical conversion unit 45 together with the data in the Uplane of the local transmission system. Furthermore, the aggregation device 4 switches the process so that information of the preset band is transmitted to the local base unit 31 instead of the base unit 3a of the company A. The electrical / optical converter 45 converts the electrical signal into an optical signal and outputs it to the local base unit 31 .

[0063] The configuration and operation of the local base unit 31 will now be described. The local base unit 31 has the same configuration as the base unit 3a, and includes a wireless data conversion unit 32, an IO input determination unit 33, a data mapping unit , and an electrical / optical conversion unit . The electrical / optical converter 35 converts the optical signal transmitted from the aggregation device 4 into an electrical signal. The data mapping unit 34 separates the received data into Uplane data and Cplane data, outputs the Uplane data to the wireless data conversion unit 32 corresponding to each band, and outputs the Cplane data to the IO input determination unit 33. The transmission path switching notification for the local base station 21 and the detouring instruction for the core network 1a of the communication carrier (A) are transmitted from the IO determination unit 33 to the local base station 21 via a control line.

[0064] Upon receiving the transmission path switching notification, the local base station 21 switches the transmission path as set in advance so as to transmit wireless data of the communication carrier (A). For example, the local base station 21 may allocate a specific band that has been set aside in advance for transmission of wireless data of the telecommunications carrier (A), or may degenerate some of the bands used in the local communication system to create free space and allocate it to the telecommunications carrier (A).

[0065] Furthermore, the local base station 21 outputs a detour instruction for the core network 1a of the telecommunications carrier (A) to the local core network 11, and the local core network 11 outputs a detour instruction to the core network 1a of the telecommunications carrier (A) via the detour optical cable 12a.

[0066] Then, when the local core network 11 receives a response from the core network 1a of the telecommunications carrier (A) indicating that the detouring has been set up, it outputs the response to the local base station 21, and the local base station 21 outputs the response to the local base station 31 via the control line.

[0067] The local base station 31 outputs the response from the core network 1a of the telecommunications carrier (A) to the aggregation device 4 via Cplane, and the control unit of the aggregation device 4 (including the abnormality detection unit 43 and the transmission data selection unit 44) confirms the response and outputs the uplink data of the telecommunications carrier (A) to the local base station 31 instead of the base station 3a.

[0068] Specifically, as shown in Figure 2(b), among the U-plane data for base station 2a, data for a band that has been set to be detoured in advance is mapped together with U-plane data for local base station 21, and output to optical / electrical conversion unit 45. The electrical / optical converter 45 converts the electrical signal into an optical signal and sends it to the local base unit 31 . In this way, operations from fault detection to detour formation are carried out.

[0069] As a result, although the mobile station of Company A that communicates with handset 50 will be temporarily out of communication range due to the occurrence of a failure, communication will then be possible again as a detour route is formed via the local communication system, allowing communication services to continue and improving convenience.

[0070] [Processing when an abnormality is detected in the parent device of the telecommunications carrier system: Figure 4] Next, the processing performed when an abnormality is detected in the MNO master device will be described with reference to Fig. 4. Fig. 4 is a flowchart showing the processing performed when an abnormality is detected in the NMO master device. As shown in FIG. 4, when the parent device 3 detects an abnormality in the IO input determination unit 33 (S11), it deploys an abnormality flag as a fault occurrence signal to the Cplane (S12). Then, the data mapping unit 34 maps the data together with U-plane data (S13), the electrical / optical conversion unit 35 converts the data into an optical signal (S14), and transmits the optical signal to the aggregation device 4 (S15). In this manner, processing is carried out when an abnormality is detected in the base unit 3.

[0071] [Processing by the aggregation device: Figure 5] The processing in the aggregation device 4 will be described with reference to Fig. 5. Fig. 5 is a flowchart showing the processing in the aggregation device 4. As shown in FIG. 5, when the aggregation device 4 receives an optical signal from the MNO base station 3 (S21), it performs optical-electrical conversion (S22) and demodulates the signal (S23). Then, it is checked whether the demodulated data contains an abnormality flag (S24), and if the abnormality flag is not contained (No), the communication system of the communication carrier is operating normally, and the process ends.

[0072] If an abnormality flag is included in the process S24 (Yes), the aggregation device 4 checks which carrier it is, and starts mapping for detouring (S25). Specifically, in the uplink, communication data of the communication carrier in the band that is set to be bypassed is mapped to a predetermined band of the local communication system. In addition, in the downlink, the communication data of the relevant communication carrier included in the band of the local communication system is mapped to the original band.

[0073] Then, the aggregation device 4 outputs a transmission path switching notification (indicated as a switching notification in the figure) to the local base station 21 (S26). The transmission path switching notification is expanded to the Cplane and output from the local parent device 31 to the local base station 21 via the control line. Furthermore, the aggregation device 4 outputs a detouring instruction to the core network 1 of the communication carrier in which the failure has occurred (S27). The detouring instruction is also transmitted via the control line.

[0074] Then, the aggregation device 4 waits for an OK flag from the core network 1 of the MNO (S28), and if an OK flag is received (YES), it starts detouring the communication data of the MNO to the local communication system (S29). Specifically, in the uplink, the communication data of the MNO received from the handset 50 is transmitted to the local base station 31, and in the downlink, the communication data of the MNO received from the local base station 31 is returned to the original band, integrated with communication data from other base stations 3, and transmitted to the handset 50. In this way, the processing in the aggregation device 4 is carried out.

[0075] [Processing in local base station: Figure 6] Next, the processing in the local base station 21 will be described with reference to Fig. 6. Fig. 6 is a flowchart showing the processing in the local base station 21. As shown in FIG. 6, when the local base station 21 receives a transmission path switching notification (referred to as a switching notification in the figure) from the local base station 31 (S31), it switches the transmission path within the local base station 21 to form a detour path (S32).

[0076] Specifically, the local base station 21 uses a band that has been prepared in advance as a standby band as a detour route, and switches to transmitting communication data of the MNO where the failure occurred using a coaxial cable corresponding to that band, or forms a detour route by partially degenerating the band that had been used by the local communication system up until then, and switches to transmitting communication data of the MNO. Information about the switched transmission path is shared with the local base unit 31 via a control line. In this manner, processing in the local base station 21 is carried out.

[0077] [Processing in the local core network: Figure 7] Next, the processing in the local core network 11 will be described with reference to Fig. 7. Fig. 7 is a flowchart showing the processing in the local core network 11. As shown in Figure 7, when the local core network 11 receives a detouring instruction addressed to the core network 1 of the MNO where the failure occurred from the local base station 21 (S41), it outputs the detouring instruction to the core network 1 of the MNO via the detouring optical cable 12 (S42).

[0078] Then, the local core network 11 waits for an OK flag from the MNO's core network 1 (S43), and when it receives it (if Yes), it transfers the OK flag to the aggregation device 4 via the base station 21 and starts mapping for detouring (S44).

[0079] Specifically, in the downlink, the local core network 11 maps the communication data received from the MNO's core network 11 into the band of the local communication system, and in the uplink, it extracts the MNO's communication data from the communication data received from the local base station 21 and maps it to be output to the MNO's core network 1 via the bypass optical cable 12. Then, the local core network 11 starts transmission and reception (detouring transmission) via the detouring optical cable 12 (S45). In this way, processing in the local core network 11 is carried out.

[0080] [Effects of the embodiment] According to this wireless communication system, a local communication system is provided having a local core network 11 connected to a telecommunications carrier's core network 1, a local base station 21 connected to the local core network 11, and a local base station 31 connected to the local base station 21 and an aggregation device 4. When a communication failure occurs between the telecommunications carrier's base station 2 and the base station 3, the aggregation device 4 connects the telecommunications carrier's core network 1 and the local core network 11 and controls the connection to detour the telecommunications carrier's communications via the local communication system. When a communication failure occurs between the telecommunications carrier's base station 2 and the base station 3, a detour route is formed, allowing the communication service to continue, thereby improving convenience.

[0081] Here, the operation of the aggregation device 4 to form a detour route based on a failure occurrence signal (abnormality flag) from the MNO base station 3 has been shown, but it is also possible to form a detour route based on an instruction from the monitoring server 6.

[0082] Furthermore, when the parent device 3 or the monitoring server 6 detects that the failure has been recovered, the aggregation device 4 outputs an instruction to the local communication system and the core network 1 of the MNO where the failure occurred to return to normal operation, and transitions to normal operation processing.

[0083] Furthermore, in the above-mentioned system, both the MNO communication system and the local communication system use 5G, but as long as the communication methods used by the MNO communication system and the local communication system are the same, it can also be realized using LTE or 4G. [Industrial Applicability]

[0084] The present invention is suitable for a wireless communication system and a wireless communication method that can continue communication services by forming a detour route when a failure occurs in communication between a base station of a communication carrier and a master unit. [Explanation of symbols]

[0085] 1,10...MNO core network, 2,20...MNO base station, 3,30...MNO parent device, 4,40...aggregation device, 6...monitoring server, 11...local core network, 21...local base station, 31...local parent device, 32...wireless data conversion unit, 33...IO input determination unit, 34...data mapping unit, 35,45...electrical / optical conversion unit, 41...optical / electrical conversion unit, 42...demodulation unit, 43...abnormality detection unit, 44...transmission data selection unit, 46...Uplane separation / combination unit, 47...optical / electrical conversion unit, 50...child device

Claims

1. A wireless communication system including an aggregation device that connects a master device and a slave device in a communication system of a telecommunications carrier, a local communication system including a local core network connected to a core network of the telecommunications carrier, a local base station connected to the core network, and a local parent device connected to the base station and the aggregation device; A wireless communication system characterized in that, when a communication failure occurs between the telecommunications carrier's base station and a parent device, the aggregation device connects the telecommunications carrier's core network to the local core network and controls switching of the connection to form a detour route for the telecommunications carrier's communication path in the local communication system.

2. The wireless communication system uses a distributed antenna system, The communication systems of telecommunications carriers are provided for each of the multiple carriers, When the aggregation device receives uplink data of the communication system of the communication carrier where the failure has occurred from the slave device, the aggregation device remaps the uplink data for a detour route of the local communication system and outputs the remapped data to the local master device; 2. The wireless communication system according to claim 1, wherein when the local core network receives the uplink data from the local base station, it outputs the data to the core network of the telecommunications carrier, and when it receives downlink data from the core network of the telecommunications carrier, it remaps the data for a bypass route of the local communication system and outputs the data to the local base station.

3. 3. The wireless communication system according to claim 1, wherein the local base station and the local master unit degenerate a communication path they are using and assign it to the detour path.

4. a monitoring server is connected to the aggregation device; 2. The wireless communication system according to claim 1, wherein the monitoring server detects the occurrence of a communication failure and instructs the local communication system to switch connections so as to form a detour route for the communication path of the communication carrier.

5. 3. The wireless communication system according to claim 1, wherein the local communication system has a standby band for transmitting data of a detour route in the event of a failure in addition to the wireless band that is maintained.

6. A communication method in a wireless communication system including a local communication system having an aggregation device that connects a parent device and a child device in a communication system of a telecommunications carrier, a local core network that connects to a core network of the telecommunications carrier, a local base station that connects to the core network, and a local parent device that connects to the base station and the aggregation device, A wireless communication method characterized in that, when a communication failure occurs between the telecommunications carrier's base station and a parent device, the aggregation device connects the telecommunications carrier's core network to the local core network and controls switching the connection to form a detour route for the telecommunications carrier's communication path in the local communication system.

Images