JP2024044504A - Wireless communication system and wireless communication method - Google Patents

Abstract

[Problem] In a distributed antenna system, when a failure occurs in the base station or base unit of a telecommunications carrier, a detour can be created to continue the communication service of the telecommunications carrier, increasing convenience. Provided are a wireless communication system and a wireless communication method that can be improved.
[Solution] A local core network 11 connected to a core network 1 of a telecommunications carrier, a local base station 21 connected to the local core network 11, and a local base station 21 connected to the local base station 21 and the aggregation device 4. The aggregation device 4 is equipped with a local communication system having a base station 31, and when a communication failure occurs between the carrier's base station 2 and the base unit 3, the aggregation device 4 is configured to connect the carrier's core network 1 and the local communication system. A wireless communication system and a wireless communication method are provided in which the wireless communication system connects the core network 11 and performs control to switch the connection so that communication of a communication carrier is bypassed via a local communication system.
[Selection diagram] Figure 1

Description

The present invention relates to a wireless communication system and a wireless communication method, and in particular, it is possible to continue communication services by forming a detour when a communication failure occurs between a base station of a communication carrier and a base unit. The present invention relates to a wireless communication system and a wireless communication method.

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. The 5G/LTE network is more stable than a wireless LAN (Local Area Network).
5G/LTE networks are provided by MNOs (Mobile Network Operators), but 5G/LTE networks can also be built by entities other than MNOs.

For this reason, some companies are starting to consider introducing 5G/LTE networks within their companies. A 4G (4th Generation) network may be used instead of 5G. Such a local network is called local 5G or private LTE.

Further, in closed spaces such as inside buildings and tunnels, carrier-shared DAS (Distributed Antenna System) is becoming popular. The carrier-shared DAS transmits and receives radio waves from multiple carriers as part of infrastructure sharing.

[Configuration of a conventional wireless communication system: Fig. 8]
A conventional wireless communication system using an antenna distribution 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 FIG. 8, the conventional wireless communication system is an antenna extension system in which communication devices for each of a plurality of mobile communication carriers (communication carriers) and a shared handset that transmits and receives wirelessly with a mobile station are connected via an optical signal aggregation device (HUB) 40.

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 communication carrier (A), communication carrier (B), communication carrier (C), and communication carrier (D) are connected to a plurality of remote units (RU) 50 via an aggregation device (HUB) 40.
The parent device 30 of each telecommunications carrier is respectively connected to base stations (BTS: Base Transceiver Stations) 20a to 20d (sometimes referred to as base stations 20), and the base stations 20a to 20d are further respectively connected to core networks 10a to 10d (sometimes referred to as core network 10).

Core networks 10a to 10d are respectively the backbone communication networks of telecommunications carrier (A), telecommunications carrier (B), telecommunications carrier (C), and telecommunications carrier (D), 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 communication carrier, and are connected to the core networks 10a to 10d by optical cables, respectively.

The master units (MUs) 30a to 30d are master devices of each communication carrier, and are connected to the base station 20 by a coaxial cable, and are also connected to the aggregation device (HUB) 40 by an optical cable. The master unit 30 converts radio signals from the base station 20 into optical signals and outputs them to the aggregation device 40, and converts optical signals from the aggregation device 40 into radio signals and outputs them to the base station 20.
The coaxial cables connecting each master unit 30 and base station 20 are provided in a number equal to the number of bands of the radio signal.

The aggregation device (HUB) 40 is a device that connects the parent devices 30a-30d of each telecommunications carrier to multiple child devices 50 via optical cables, and receives and consolidates optical signals from the parent devices 30a-30d, aggregates them, and distributes them to the multiple child devices 50. It also receives optical signals from the multiple child devices 50, separates them into wireless signal bands, and outputs them to the corresponding parent devices 30a-30d.

The handset 50 is, for example, a wireless communication device provided at various locations within a building (ceiling, wall, floor, etc.) and equipped with a directional antenna, and performs wireless communication with a mobile station (not shown). The handset 50 is connected to the aggregation device 40 via an optical cable, converts an optical signal from the aggregation device 40 into a wireless signal, and outputs the signal from an antenna. It also converts the wireless signal received by the antenna into an optical signal and outputs it to the aggregation device 40.
By using a carrier-shared DAS, mobile stations of a plurality of carriers located in a building or the like can transmit and receive data via the shared handset 50.

The operation of a conventional wireless communication system will be briefly explained.
In the uplink, the wireless signal received by the handset 50 is converted into an optical signal and optically transmitted to the aggregation device 40.The aggregation device 40 separates it by band and aggregates it by carrier, and sends it to the corresponding base device. The base station 30 converts the optical signal into an electrical signal and transmits it to the base station 20 via a coaxial cable, and the base station 20 converts it back into an electrical signal and outputs it to the core network 10.

In the downlink, the optical signal from the core network 10 is sent to the base station 20, where it is converted into an electrical signal and transmitted to the base unit 30 via the coaxial cable for each band, and the base unit 30 transmits the optical signal again. The signal is converted into a signal, sent to a plurality of slave units 50 via the aggregation device 4, and transmitted wirelessly from each slave unit 50.

[If a problem occurs with the carrier's equipment]
In conventional wireless communication systems, if a problem occurs in the communication between the carrier's base station 20 and the base unit 30, the communication service of the carrier will be cut off because there is no detour route. Put it away.

[Related Technology]
Incidentally, a conventional technology for a wireless communication system is disclosed in JP 2014-187450 A, “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 multiple frequencies.

JP 2014-187450 A

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

Furthermore, in Patent Document 1, a local network is connected to a carrier-shared DAS, and if there is a problem with the carrier's base station or base unit, the local network is used as a detour and the trouble is resolved. There is no mention of connecting to the carrier's core network.

The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a wireless communication system and method that can improve convenience by forming a detour route to continue the communication service of a telecommunications carrier in the event of a failure in the base station or parent unit of the telecommunications carrier in a system using DAS, and by improving the convenience of the telecommunications carrier.

The present invention for solving the problems of the conventional example described above is a wireless communication system including an aggregation device that connects a base unit and a slave unit in a communication carrier's communication system, and which connects to the carrier's core network. A local communication system includes a local core network, 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 connects to the base station of the carrier. When a communication failure occurs with the base unit, the core network of the carrier and the local core network are connected, and a detour for the carrier's communication path is created in the local communication system. It is characterized by performing switching control.

The present invention is also characterized in that, in the wireless communication system, the wireless communication system uses a distributed antenna system, the communication systems of the telecommunications carriers are provided for each of the multiple carriers, and when the aggregation device receives uplink data of the communication system of the telecommunications carrier where a failure has occurred from the slave device, it remaps the uplink data for a detour route of the local communication system and outputs it to the local parent device, and when the local core network receives uplink data from the local base station, it outputs it to the telecommunications carrier's core network, and when it receives downlink data from the telecommunications carrier's core network, it remaps the data for a detour route of the local communication system and outputs it to the local base station.

Furthermore, the present invention is characterized in that, in the wireless communication system, the local base station and the local base station degenerate the communication path they are using and allocate it to a detour.

The present invention is also characterized in that 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 for the communication path of the telecommunications carrier.

The present invention is also characterized in that in the wireless communication system, the local communication system has a standby band for transmitting detour data in the event of a failure in addition to the wireless band it maintains.

Furthermore, the present invention provides an aggregation device that connects a base unit and a slave unit in a communication carrier's communication system, a local core network that connects to the carrier's core network, and a local base station that connects to the core network. , a communication method in a wireless communication system comprising a base station and a local base unit connected to the aggregation device, the aggregation device communicating between the base station of a carrier and the base unit. When a communication failure occurs in the network, the core network of the carrier is connected to the local core network, and the connection is controlled to be switched so that a detour for the carrier's communication route is created in the local communication system. It is a feature.

According to the present invention, a wireless communication system is provided with an aggregation device that connects a parent device and a child device in a communication system of a telecommunications carrier, the local communication system having 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 parent device that connects to the base station and the aggregation device. The aggregation device is a wireless communication system that, when a communication failure occurs between the telecommunications carrier's base station and the parent device, 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 parent device, the communication of the telecommunications carrier can be detoured to the local communication system, and communication between the base station and the child device can be performed, thereby enabling communication services to be continued and improving convenience.

In addition, 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 on the communication path of the communication carrier. Therefore, the monitoring server monitors the operation 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, thereby improving convenience.

Further, according to the present invention, there is provided an aggregation device that connects a base unit and a slave unit in a communication carrier's communication system, a local core network that connects to the carrier's core network, and a local base that connects to the core network. A communication method in a wireless communication system comprising a base station and a local base unit connected to the base station and the aggregation device, the aggregation device connecting the base station and the base unit of a carrier. When a communication failure occurs between networks, the core network of the carrier is connected to the local core network, and the connection is switched so that a detour for the carrier's communication path is created in the local communication system. Since this is a communication method, if a communication failure occurs between the base station of the carrier and the base unit, the local communication system will bypass the communication of the carrier and the communication between the base station and the slave unit will be established. This has the effect of making it possible to carry out communication between users, allowing communication services to continue, and improving convenience.

FIG. 1 is an explanatory diagram showing the configuration of a wireless communication system. It is an explanatory diagram showing an outline of mapping in an aggregation device. FIG. 2 is an explanatory diagram showing the configuration of a parent device and an aggregation device. 10 is a flowchart showing a process performed when an abnormality is detected in the NMO master unit. 13 is a flowchart showing a process in the aggregation device 4. 13 is a flowchart showing a process in a local base station 21. 3 is a flowchart showing processing in the local core network 11. FIG. FIG. 1 is an explanatory diagram showing the configuration of a conventional wireless communication system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
[Outline of the embodiment]
A wireless communication system according to an embodiment of the present invention (this wireless communication system) is a wireless communication system equipped with an aggregation device that connects a parent unit and a child unit in a communication system of a telecommunications carrier, and includes 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 parent unit connected to the local base station and the aggregation device. When a communication failure occurs between the telecommunications carrier's base station and the parent unit, the aggregation device connects the telecommunications carrier's core network 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 parent unit, a detour is formed, making it possible to continue communication services and improving convenience.

Moreover, the wireless communication method according to the embodiment of the present invention is a wireless communication method in the present wireless communication system.

[Configuration of a wireless communication system according to an embodiment: FIG. 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 FIG. 1, this wireless communication system uses a DAS (distributed antenna system) like the conventional wireless communication system shown in FIG. 8, and is a wireless communication system in which parent units (MUs) 3a to 3d (sometimes referred to as parent unit 3) of communication carriers (A), (B), (C), and (D) are connected to a shared plurality of child units (RUs) 50 via an aggregation device 4.
The slave unit 50 has the same configuration and operates in the same manner as a conventional one.

Furthermore, this wireless communication system includes a local communication system connected to the aggregation device 4, and a master unit (local master unit) 31 of the local communication system is connected to the aggregation device 4 in the same manner as the master units 3a to 3d of the telecommunications carrier.
Furthermore, the present wireless communication system is configured to include a monitor control server 6 connected to the aggregation device 4 .

The base stations 3 of each carrier are connected to base stations (BTS) 2a to 2d (sometimes referred to as base stations 2), and the base stations 2a to 2d are connected to core networks (NWs), respectively. 1a to 1d (sometimes referred to as core network 1).
For convenience, a system including a core network 1, a base station 2, and a base unit 3 for each communication carrier will be referred to as a communication system of the communication carrier.

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, which is the same as the communication system of the communication carrier.
In other words, this wireless communication system is an antenna distributed system in which the communication systems of multiple (here, four) carriers and the local communication system are connected to multiple handsets 50 via the aggregation device 4. .

The features of this wireless communication system will be explained.
In this wireless communication system, detour optical cables 12a to 12d (sometimes referred to as detour optical cables 12) are provided in advance to connect the local core network 11 and the core networks 1a to 1d of each communication carrier. There is.

Here, in this wireless communication system, communication using the bypass optical cable 12 is not performed during normal operation, but if a failure occurs in communication between the base station 2 and base unit 3 of the communication carrier's communication system. , the carrier's core network 1 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.
Further, when the aggregation device 4 receives communication data of a communication carrier in which a failure has occurred from the slave unit 50, the aggregation device 4 outputs the communication data to the local base unit 31 instead of the base unit 3 of the carrier. .
Switching of these communications will be described later.

The base station 2 and base unit 3 of the telecommunications carrier are connected by coaxial cables corresponding to the number of radio signal bands, as in the past, and as a feature of this wireless communication system, the base station 2 and base unit 3 are It has a control signal port for transmitting and receiving signals, and the base station 2 and base unit 3 are connected by a control line.

Then, the base station 2 transmits a control signal to the base unit 3, and the base unit 3 monitors whether or not the control signal is normally received. 3 notifies the aggregation device 4 of the abnormality as a failure occurrence signal (abnormality flag) using a break contact or the like.
If the control signal cannot be received normally, it is considered that a failure has occurred in the equipment or transmission path of the base station 2, and the transmission and reception of wireless signals cannot be performed normally.

The monitoring server 6 is connected to the aggregation device 4 by a control line, receives and accumulates data on the operating status of each carrier's communication system and failure signal from the aggregating device 4, and displays the operating status on a display unit. to enable monitoring.
In particular, in this wireless communication system, when the monitoring server 6 detects that a failure has occurred in the communication system of a communication carrier, the monitoring server 6 requests the aggregation device 4 to transfer the communication of the carrier to the local communication system as described later. Instructs to detour through the system.
The monitoring server 6 can also control (instruct) the aggregation device 4 to allocate (mapping) bands during detours.

The aggregation device 4 performs the same operations as in the past, and as a feature of this wireless communication system, when a failure occurs in communication between the base station 2 of a telecommunications carrier and the parent device 3, it controls the communication of the telecommunications carrier to be diverted via the local communication system.

As in the past, the aggregation device 4 stores band information (bandwidth and bandwidth) determined for each communication carrier and local communication system, and during normal operation, the uplink The communication data received from the device 50 is separated into each band, mapped to optical data, and transmitted to the corresponding base device 3.
Furthermore, in the downlink, the aggregation device 4 receives and integrates optical signals from a plurality of base units 3, remaps them, and transmits them to a plurality of slave units 50.

Furthermore, the aggregation device 4 of this wireless communication system stores in advance information on a band to be detoured to the local communication system in the event of a failure in the communication system of a telecommunications carrier, and receives a failure occurrence signal from the base unit 3. (Abnormal flag) is received, control is performed to divert the communication data of the stored band among the bands of the corresponding communication carrier to the local communication system. This control will be described later.
In order to perform this detour transmission, if the local communication system is in asynchronous or semi-synchronous operation, it is switched to synchronous operation with the communication carrier's communication system.

[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 described with reference to Fig. 2. Fig. 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 the communication system of company A. Note that, although the bandwidth actually differs for each band, it is shown as the same bandwidth to simplify the drawing. Also, Fig. 2 shows an uplink from the aggregation device 4 to the parent device 4.

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

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 handset 50, which is of the preset A3.4G communication data, into optical data so as to be inserted into the band (L5G) of the local communication system.
This creates an A3.4G bypass for the local communication system.

In this case, instead of using the entire L5G band, a portion of it may be allocated for bypassing A3.4G.
In addition, the local communication system may reserve a specific band for a detour route that is not used by any MNO as a standby band in advance, or may use the entire L5G bandwidth 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 preferable that the bandwidth and the allocation method to be assigned to the detour route are determined in advance and set in the aggregation device 4 and each device of the local communication system.

In the downlink, L5G data into which 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 as in the past. At this time, the A3.4G communication data received by the detour is mapped to the original A3.4G band.

Since no failure has occurred in the handset 50, the mobile station of company A that performs wireless transmission and reception with the handset 50 is able to communicate as in normal times.
Although only A3.4G is detoured here, other A800, A700, etc. may also be detoured if there is sufficient L5G bandwidth.

[Outline of detour route switching]
Next, an overview 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 of 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 21 and the local parent device 31, and is then transmitted from the local core network 11 to the core network 1a of Company A via the detouring optical cable 12a.

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

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 bypass 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 company A's data to the local base station 31 .
In this manner, the operation of switching to the detour route is performed.

[Configuration and operation of base unit and aggregation device regarding detour formation: Figure 3]
Next, the configuration and operation of the carrier's base station (MNO base station) 2, base unit (MNO base unit) 3, local base unit 31, and aggregation device 4, which are the features of this wireless communication system, will be explained in FIG. This will be explained in detail using . FIG. 3 is an explanatory diagram showing the configuration of the parent device and the aggregation device. Here, the base station 3a and base unit 3a of communication carrier A will be explained as an example of the MNO base station 2 and MNO base unit 3, but the same applies to communication systems of other communication carriers.

As shown in FIG. 3, the base station 2a and base unit 3a are equipped with a coaxial cable that transmits communication data for each band, and a control line that connects the control ports.
The base device 3a includes a wireless data conversion section 32, an IO input determination section 33, a data mapping section 34, and an electrical/optical conversion section 35.

The configuration of the base unit 3a and the downlink operation will be explained.
The wireless data converter 32 of the base unit 3a outputs the data received via the coaxial cable to the data mapping unit 34 as upplane.
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 using a Cplane for control signals.

The data mapping unit 34 maps wireless data (Upplane) and control data (Cplane) to 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, wireless data and a fault occurrence signal (abnormality flag) are transmitted to the aggregation device 4.

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, an uplane 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 a process of switching the communication path.

The optical/electrical converter 41 converts an optical signal received on the downlink into an electrical signal.
The demodulation section 42 demodulates the received signal, separates Cplane data, and outputs it to the abnormality detection section 43 , and outputs the Upplane data to the Upplane separation/combination section 46 .
The abnormality detection unit 43 determines whether the separated Cplane data includes an abnormality flag and outputs it to the transmission data selection unit 44 together with information indicating from which base unit the data was transmitted (here, the base unit 3a).

Further, the upplane separation/synthesis section 46 synthesizes and compresses the upplane data, and outputs the result to the optical/electrical conversion section 47 .
The optical/electrical converter 47 converts the electrical signal into an optical signal and transmits it to each child device 50 via an optical cable.
Up to this point, the operation is downlink.

In the uplink, the optical/electrical converter 47 of the aggregation device 4 converts the optical signal received from the slave unit 50 into an electrical signal and outputs it to the upplane separation/combination unit 46 .
The upplane separation/synthesis section 46 extracts and synthesizes upplane data from the data received from the handset 50.

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

In other words, if there is no abnormality, data intended for the local base station 21 is selected as data to be transmitted to the local parent unit 31, and data intended for the base station 2a is selected as data to be transmitted to the parent unit 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.

Further, when the abnormality detection unit 43 determines that a failure signal has been received from the base unit 3a, the transmission data selection unit 44 sends a detour to the local base station 21 using the Cplane, as will be described later. At the same time, it generates a transmission path switching notification to form a transmission path, and also generates a detour instruction for the core network 1a of the communication carrier (A) where the failure has occurred, and sends it to the electrical/optical converter 45 together with the Upplane data of the local transmission system. Output.
In addition, the aggregation device 4 switches the process to transmit the preset band information to the local base unit 31 instead of the base unit 3a of company A.
The electrical/optical converter 45 converts the electrical signal into an optical signal and outputs it to the local master device 31.

The configuration and operation of the local master device 31 will be explained.
The local base device 31 has the same configuration as the base device 3a, and includes a wireless data conversion section 32, an IO input determination section 33, a data mapping section 34, and an electrical/optical conversion section 35.
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 Upplane data and Cplane data, outputs the Upplane data to the wireless data conversion unit 32 corresponding to each band, and outputs the Cplane data to the IO input determination unit 33. do.
The transmission path switching notification for the local base station 21 and the detour 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.

When the local base station 21 receives the transmission path switching notification, it switches the transmission path as previously set 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 kept in standby in advance for the 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).

Furthermore, the local base station 21 outputs a detour instruction for the communication carrier (A)'s core network 1a to the local core network 11, and the local core network 11 sends a detour instruction to the communication carrier (A) via the detour optical cable 12a. A detour instruction is output to the core network 1a of (A).

When the local core network 11 receives a response indicating completion of the detour setting from the core network 1a of the communication carrier (A), the local core network 11 outputs the response to the local base station 21, and the local base station 21 receives the response via the control line. and outputs the response to the local master device 31.

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

Specifically, as shown in FIG. 2(b), among the Upplane data for the base station 2a, the data of the band that is set to be detoured in advance is combined with the Upplane data for the local base station 21. It is mapped and output to the optical/electrical converter 45.
The electrical/optical converter 45 converts the electrical signal into an optical signal and sends it to the local master device 31.
In this manner, operations from fault detection to detour formation are performed.

As a result, although the mobile station of Company A that communicates with handset 50 will be temporarily out of range due to the occurrence of a failure, a detour will then be created via the local communication system, allowing communication to be resumed, and communication services can be continued, improving convenience.

[Processing when an abnormality is detected in the base unit of the carrier system: Figure 4]
Next, processing when an abnormality is detected in the MNO base unit will be described using FIG. 4. FIG. 4 is a flowchart showing processing when an abnormality is detected in the NMO base unit.
As shown in FIG. 4, when the IO input determination unit 33 detects an abnormality (S11), the base unit 3 deploys an abnormality flag to the Cplane as a failure occurrence signal (S12).
Then, the data mapping section 34 maps it together with the Upplane data (S13), the electrical/optical converting section 35 converts it into an optical signal (S14), and transmits it to the aggregation device 4 (S15).
In this way, the process when an abnormality is detected in the base unit 3 is performed.

[Processing of aggregation device: Figure 5]
Processing in the aggregation device 4 will be explained using 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 unit 3 (S21), it performs optical-to-electrical conversion (S22) and demodulates it (S23).
Then, it is checked whether the demodulated data includes an abnormality flag (S24), and if the abnormality flag is not included (in the case of No), the communication system of the carrier is operating normally. , the process ends.

Furthermore, if an abnormality flag is included in the process S24 (Yes), the aggregation device 4 checks which communication 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, communication data of the relevant carrier included in the band of the local communication system is mapped to the original band.

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 deployed 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.

Then, the aggregation device 4 waits for an OK flag from the core network 1 of the MNO (S28), and if the OK flag is received (in the case of YES), the aggregation device 4 detours the communication data of the MNO to the local communication system. Transmission is started (S29).
Specifically, in the uplink, the communication data of the MNO received from the slave unit 50 is transmitted to the local base unit 31, and in the downlink, the communication data of the MNO received from the local base unit 31 is transmitted to the original base unit 31. The data is returned to the band, integrated with communication data from other base units 3, and transmitted to the slave unit 50.
In this way, processing in the aggregation device 4 is performed.

[Processing at local base station: Figure 6]
Next, processing at the local base station 21 will be explained using FIG. 6. FIG. 6 is a flowchart showing processing at the local base station 21.
As shown in FIG. 6, when the local base station 21 receives a transmission path switching notification (described as switching notification in the figure) from the local base station 31 (S31), the local base station 21 detours the transmission path within the local base station 21. (S32).

Specifically, the local base station 21 uses a band previously prepared as a standby band as a detour 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 by partially degenerating the band that had been used by the local communication system up until that point, and switches to transmitting communication data of the MNO.
Information on the switched transmission path is shared with the local master unit 31 via a control line.
In this manner, processing in the local base station 21 is carried out.

[Processing in 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 FIG. 7, when a local core network 11 receives a detouring instruction addressed to the core network 1 of the MNO where a failure has occurred from a local base station 21 (S41), it outputs a detouring instruction to the core network 1 of the MNO via the detouring optical cable 12 (S42).

Then, the local core network 11 waits for the OK flag from the MNO's core network 1 (S43), and upon receiving it (in the case of Yes), transfers the OK flag to the aggregation device 4 via the base station 21 and detours the OK flag. Mapping for time is started (S44).

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, 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 manner, processing in the local core network 11 is carried out.

[Effects of embodiment]
According to this wireless communication system, 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 base station 21 and aggregation device 4 are connected to each other. The aggregation device 4 is equipped with a local communication system having a local base unit 31 to be connected, and when a communication failure occurs between the base station 2 of the carrier and the base unit 3, the aggregation device 4 connects to the core network of the carrier. 1 and the local core network 11, and performs control to switch the connection so that communication of the communication carrier is bypassed via the local communication system, and between the base station 2 of the communication carrier and the base unit 3. If a communication failure occurs, a detour can be created to continue the communication service, which has the effect of improving convenience.

Note that although the operation in which the aggregation device 4 forms a detour based on the failure occurrence signal (abnormality flag) from the MNO's master device 3 is shown here, it is also possible to form a detour based on an instruction from the monitoring server 6. is also possible.

In addition, when the parent device 3 or the monitoring server 6 detects recovery from the failure, the aggregation device 4 outputs an instruction to the local communication system and the MNO's core network 1 where the failure occurred to return to normal operation, and transition to normal operation processing.

Furthermore, in the above system, both the MNO's communication system and the local communication system use 5G, but if the communication methods of the MNO's communication system and the local communication system match, it is possible to use LTE or 4G. However, it is possible.

INDUSTRIAL APPLICATION This invention is suitable for the radio|wireless communication system and the radio|wireless communication method which can continue a communication service by forming a detour when a communication failure occurs between the base station of a communication carrier and a main unit.

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 (6)

A wireless communication system including an aggregation device that connects a master unit and a slave unit in a communication system of a communication carrier,
A local communication system including a local core network connected to a core network of the communication carrier, a local base station connected to the core network, and a local parent device connected to the base station and the aggregation device,
The aggregation device is a wireless communication system characterized in that when a communication failure occurs between the telecommunications carrier's base station and a parent unit, it 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. Wireless communication systems use distributed antenna systems,
A telecommunications carrier's communication system is set up for each multiple carrier,
When the aggregation device receives the uplink data of the communication system of the communication carrier in which the failure has occurred from the child device, the aggregation device remaps the uplink data for the detour route of the local communication system. Output to the local master machine,
When the local core network receives the uplink data from the local base station, it outputs it to the carrier's core network, and when it receives the downlink data from the carrier's core network, it outputs the uplink data to the carrier's core network. 2. The wireless communication system according to claim 1, wherein the wireless communication system is mapped again for a detour route of the local communication system and output to the local base station. 3. The wireless communication system according to claim 1, wherein the local base station and the local base station degenerate the communication path being used and allocate it to the detour path. 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 detouring route for the communication line of the communication carrier. The wireless communication system according to claim 1 or 2, characterized in that the local communication system has a standby band for transmitting detour data in the event of a failure in addition to the wireless band it maintains. An aggregation device that connects a parent device and a slave device 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 the base station. and a local communication system having a local base unit connected to the aggregation device, the communication method in a wireless communication system comprising:
When a communication failure occurs between the carrier's base station and the base unit, the aggregation device connects the carrier's core network and the local core network, and connects the carrier's core network to the local core network. A wireless communication method characterized by performing control to switch connections so as to form a detour of a communication path in the local communication system.

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