JP2011199412A - Base station system and gateway device - Google Patents

Abstract

Provided is a base station system that can accommodate a plurality of baseband units without adding a gateway device even when a plurality of baseband units that accommodate a plurality of distributed base stations are required.
A plurality of baseband units 12-1 to 12-m are accommodated in concentrators 11-1 and 11-2 each having an Ethernet switch. The concentrators 11-1 and 11-2 have a redundant configuration, and when an abnormality occurs in one concentrator that transmits an IP packet, the other concentrator switches so as to transmit the IP packet.
[Selection] Figure 1

Description

  The present invention relates to a base station system including a distributed base station that enables mobile terminals to be wirelessly accommodated, and a gateway device that accommodates the distributed base station.

  Along with the development of wireless broadband technology, higher speed, higher functionality, and multi-functionality of communication in the communication field are becoming more and more advanced.

  In a mobile communication system, wireless communication is performed between a base station installed in a service area and a wireless terminal in that area. Conventional base stations are mainly integrated base stations in which a radio unit and a baseband unit are integrated. The maximum number of wireless terminals that can be accommodated in one integrated base station is determined depending on the hardware specifications of the base station.

  By the way, in recent years, a distributed base station in which the function of a baseband unit is separated from a conventional integrated base station has been studied (for example, see Patent Document 1). Signal processing information for a plurality of distributed base stations is shared by one baseband unit in which these distributed base stations are accommodated. Therefore, the statistical multiplexing effect can be expected, and the number of terminals that can be accommodated increases as compared with the integrated base station.

  However, in a densely populated area where a large number of distributed base stations need to be installed, a plurality of baseband units that accommodate the distributed base stations are required. Therefore, it is necessary to prepare a plurality of gateway devices that accommodate the baseband units. . Therefore, there has been a problem that the cost of the system becomes enormous.

JP 2009-141707 A

  As described above, in a densely populated area where a large number of distributed base stations need to be installed, a plurality of gateway devices are required to accommodate a plurality of baseband units, which increases the cost of the system. It was.

  The present invention has been made in view of the above circumstances, and its object is to provide a plurality of baseband units without adding a gateway device even when a plurality of baseband units for accommodating a plurality of distributed base stations are required. Is to provide a base station system capable of accommodating a plurality of baseband units and a gateway device capable of accommodating a plurality of distributed base stations.

  To achieve the above object, a base station system according to the present invention is connected to a gateway device, and receives a downlink IP (Internet Protocol) signal with a destination address from the gateway device. A first local area network (LAN) switch that receives an IP signal from the gateway device via a first port of the first LAN switch, and transmits the IP signal to the other LAN switches in the first LAN switch; A first concentrator that outputs from a port corresponding to the destination address among a plurality of ports, and each of which is connected to the other plurality of ports, and converts an IP signal from the first concentrator into a radio signal. A plurality of baseband units and a plurality of distributed base stations connected to each of the plurality of baseband units. Comprises a distributed base station for transmitting a radio signal from the plurality of base band unit to the space.

  In the base station system configured as described above, a plurality of baseband units are accommodated in a concentrator having a LAN switch. This makes it possible to accommodate this base station system with a single gateway device.

  The gateway device according to the present invention is connected to a network, and outputs a downlink IP (Internet Protocol) signal to which a destination address is attached based on a data signal from the network; A local area network (LAN) switch that receives an IP signal from the gateway processing unit via a first port of the first LAN switch, and sends the IP signal to a plurality of other LANs in the first LAN switch. A first concentrator that outputs from a port corresponding to the destination address among the ports, and each of which is connected to the other plurality of ports, and converts an IP signal from the first concentrator into a radio signal, A plurality of baseband units that output radio signals to a plurality of distributed base stations that transmit to a space.

  The gateway device having the above configuration includes a plurality of baseband units and a concentrator. A plurality of baseband units are accommodated by the concentrator. As a result, a plurality of baseband units can be mounted on one gateway device.

  According to this invention, even when a plurality of baseband units that accommodate a plurality of distributed base stations are required, a base station system that can accommodate a plurality of baseband units without adding a gateway device, and It is possible to provide a gateway device that is equipped with a plurality of baseband units and can accommodate a plurality of distributed base stations.

1 is a block diagram showing a configuration of a mobile communication system according to a first embodiment of the present invention. It is a block diagram which shows the function structure of the concentrating part used for the base station system of FIG. It is a block diagram which shows the function structure of the baseband unit of FIG. It is a block diagram which shows the structure of the mobile communication system which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the function structure of the concentrating part used for the gateway apparatus of FIG. It is a block diagram which shows the other example of a function structure of a baseband unit.

[First Embodiment]
Hereinafter, embodiments of a base station system according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a mobile communication system according to the first embodiment of the present invention. The mobile communication system in FIG. 1 includes a base station system 10 that forms a radio zone and accommodates a mobile terminal (MS: Mobile Station) such as a PHS, and a gateway device 20.

  The gateway device 20 interconnects different communication networks such as an IP (Internet Protocol) network NW1 and a PSTN (Public Switched Telephone Network) NW2. Further, the gateway device 20 accommodates the base station system 10. The gateway device 20 and the base station system 10 are connected by an Ethernet (registered trademark) LAN (Local Area Network) cable.

  The gateway device 20 receives a data signal from the IP network NW1 or PSTN NW2, and outputs the data signal to the base station system 10 as a downlink IP packet. Further, the gateway device 20 receives an uplink IP packet from the base station system 10, converts it as necessary, and outputs it to the IP network NW1 or PSTN NW2.

  The base station system 10 includes concentrators 11-1 and 11-2, baseband units 12-1 to 12-m (m is a natural number), and distributed base stations BS1 to BSn (n is a natural number). The concentrators 11-1 and 11-2 and the baseband units 12-1 to 12-m are connected by, for example, a LAN cable.

  FIG. 2 is a block diagram showing functional configurations of the concentrator 11-1 and the concentrator 11-2 used in the base station system 10 according to the first embodiment of the present invention. The concentrators 11-1 and 11-2 have a redundant configuration, and either one outputs a signal from the gateway device 20 to the baseband units 12-1 to 12 -m, and the baseband unit 12- The signals from 1 to 12-m are output to the gateway device 20.

  The concentrator 11-1 includes a concentrator switch 111-1 and a concentrator monitoring controller 112-1. The concentrator 11-2 includes a concentrator switch 111-2 and a concentrator monitoring controller 112-2. In addition, since the concentrating part 11-1 and the concentrating part 11-2 take the same structure, the concentrating part 11-1 is demonstrated here.

  The line collecting switch 111-1 is an Ethernet switch that connects any one of the baseband units 12-1 to 12-m to the gateway device 20 on a one-to-one basis. The line collecting switch 111-1 includes a plurality of ports, and is connected to the gateway device 20 and the baseband units 12-1 to 12-m through these ports.

  The line collecting switch 111-1 operates based on the on control and the off control from the line collecting monitoring control unit 112-1. Concentration switch 111-1 starts an output operation to output the received IP packet to a desired output destination when it receives an on control from concentrator monitoring control unit 112-1, and stops the output operation when it receives an off control. To do.

  Concentration switch 111-1 temporarily holds this data when it receives an IP packet during an output operation. A destination address is attached to the IP packet. Concentration switch 111-1 has a correspondence table of destination addresses and port numbers in advance, determines the output destination port with reference to this correspondence table, and outputs the held IP packet to the corresponding port. For example, when the concentrator switch 111-1 receives a downlink IP packet with a destination address of the distributed base station BS1, the baseband unit 12 that accommodates the distributed base station BS1 is referred to the correspondence table. This IP packet is output to the port to which -1 is connected.

  The line concentrator switch 111-1 has a function of monitoring the status of each port. Here, the status indicates whether the port has received the IP packet normally. The status is “up” when the IP packet is normally received, and “down” when the IP packet is not received within a predetermined period. When the status of any of the ports becomes “down” during the output operation, the line collecting switch 111-1 generates an abnormal signal indicating that an abnormality has occurred, and this abnormal signal is sent to the line collecting monitoring control unit 112-1. Output to.

  When the line collection monitoring control unit 112-1 receives an abnormality signal from the line collection switch 111-1, the line collection monitoring control unit 112-1 determines that an abnormality has occurred in the line collection switch 111-1. Then, the line collection monitoring control unit 112-1 performs OFF control on the line collection switch 111-1, and outputs a switching signal to the line collection monitoring control unit 112-2. Upon receiving this switching signal, the line collection monitoring control unit 112-2 performs on control on the line collection switch 111-2. Thereby, instead of the line collecting switch 111-1, the line collecting switch 111-2 performs an output operation.

  Further, the line collection monitoring control unit 112-1 monitors whether the power of the line collection unit 11-2 is turned on in a state where the line collection switch 111-1 is controlled to be off. The concentrator 11-2 enters a state in which the power is not turned on when the power of the concentrator 11-2 is off, when the power is on but fails to start, or when the power suddenly goes down. For this reason, the concentrator monitoring control unit 112-1 has the concentrator 11-2 when the power of the concentrator 11-2 is off, when the power is on but fails to start, or when the power suddenly goes down. It is determined that an abnormality has occurred. When the line collection monitoring control unit 112-1 determines that an abnormality has occurred in the line collection unit 11-2, the line collection switch 111-1 is turned on so that the line collection switch 111-1 performs an output operation. I do. Thereby, for example, when the power supply of the concentrator 11-2 suddenly goes down while the concentrator switch 111-2 is processing, the concentrator switch 111-1 performs an output operation instead of the concentrator switch 111-2. It becomes like this.

  FIG. 3 is a block diagram showing a functional configuration of the baseband units 12-1 to 12-m according to the first embodiment of the present invention. The baseband units 12-1 to 12-m include a MAC (Media Access Control) processing unit 121 and a PHY processing unit 122. The MAC processing unit 121 generates and separates a wireless MAC frame. The PHY processing unit 122 performs modulation / demodulation and photoelectric conversion, and connects the baseband unit and the distributed base station. Further, by having a plurality of ports, a plurality of distributed base stations BS1 to BSn are accommodated.

  The distributed base stations BS1 to BSn are distributed in the service area in accordance with, for example, a microcell system. The distributed base stations BS1 to BSn form a radio zone and accommodate the mobile terminal MS. The distributed base stations BS1 to BSn perform radio communication with the accommodated mobile terminal MS, transmit a signal from the connected baseband unit 12 to the mobile terminal MS, and transmit a signal from the mobile terminal MS to the baseband unit 12. Output.

  As described above, in the first embodiment, the plurality of baseband units 12-1 to 12-m are accommodated in the concentrators 11-1 and 11-2 having Ethernet switches. Thereby, the base station system 10 can accommodate a plurality of baseband units in one gateway device 20.

  Therefore, according to the base station system according to the present embodiment, even when a plurality of baseband units that accommodate a plurality of distributed base stations are required, a plurality of baseband units are installed without adding a gateway device. Can be accommodated. Thereby, even if it is a case where a mobile communication system is built in a population dense area etc., construction cost can be held down.

  In the first embodiment, the concentrators 12-1 and 12-2 adopt a redundant configuration. As a result, even when an abnormality occurs in one of the concentrators that collects the plurality of baseband units 12-1 to 12-m, the IP packet can be normally transmitted.

[Second Embodiment]
FIG. 4 is a block diagram showing a configuration of a mobile communication system according to the second embodiment of the present invention. The mobile communication system in FIG. 4 includes distributed base stations BS1 to BSn that form radio zones and accommodate mobile terminals such as PHS, and a gateway device 30. 4 that are the same as those in FIG. 1 are denoted by the same reference numerals.

  The gateway device 30 accommodates a gateway processing unit 31, concentrating units 32-1 and 32-2, and distributed base stations BS1 to BSn that interconnect a communication network different from the mobile communication system such as the IP network NW1 and the PSTN NW2. Baseband units 12-1 to 12-m and a switching control unit 33. The concentrators 32-1 and 32-2 have a redundant configuration, and either one outputs a signal from the gateway processing unit 31 to the baseband units 12-1 to 12-m, and the baseband unit 12 The signals from −1 to 12-m are output to the gateway processing unit 31.

  FIG. 5 is a block diagram showing a functional configuration of the concentrators 32-1 and 32-2 used in the gateway device 30 according to the second embodiment of the present invention.

  The line concentrator 32-1 includes a line concentrator switch 321-1 and a line concentrator monitoring controller 322-1. The line concentrator 32-2 includes a line concentrator switch 321-2 and a line concentrator monitoring controller 322-2. In addition, since the concentrating part 32-1 and the concentrating part 32-2 have the same structure, the concentrating part 32-1 is demonstrated here.

  The line concentrator switch 321-1 is an Ethernet (registered trademark) switch that connects any one of the baseband units 12-1 to 12-m and the gateway processing unit 31 on a one-to-one basis. The line collecting switch 321-1 includes a plurality of ports, and is connected to the gateway processing unit 31 and the baseband units 12-1 to 12-m through these ports.

  The line collection switch 321-1 operates based on the on control and the off control from the line collection monitoring control unit 322-1. Concentration switch 321-1 starts an output operation to output the received IP packet to a desired output destination when receiving an on control from concentrator monitoring control unit 322-1, and stops the output operation upon receiving an off control. To do.

  The line concentrator switch 321-1 has a correspondence table between destination addresses and port numbers in advance. When receiving the IP packet during the output operation, the line concentrator switch 321-1 refers to this correspondence table and determines the output destination port of the received data.

  The line concentrator switch 321-1 has a function of monitoring the status of each port. The concentrator switch 321-1 outputs an abnormal signal indicating that an abnormality has occurred when the status of any port becomes “down” while the concentrator 32-1 is transmitting IP packets. It generates and outputs this abnormal signal to the concentrator monitoring controller 322-1.

  The line collection monitoring control unit 322-1 determines that an abnormality has occurred in the line collection switch 321-1 when receiving an abnormality signal from the line collection switch 321-1. Then, the line collection monitoring control unit 322-1 controls to turn off the line collection switch 321-1 and outputs an abnormal signal to the switching control unit 33 described later. When the line collection monitoring control unit 322-1 receives the switching signal from the switching control unit 33, the line collection monitoring control unit 322-1 performs ON control on the line collection switch 321-1.

  The switching control unit 33 controls switching between the concentrating units 32-1 and 32-2. When the switching control unit 33 receives an abnormality signal from the line collection monitoring control unit 322-1 or the line collection monitoring control unit 322-2, the switching control unit 33 outputs a switching signal to the line collection monitoring control unit that has not output the abnormality signal. For example, when the switching control unit 33 receives an abnormal signal from the line concentration monitoring control unit 322-1, the switching control unit 33 outputs a switching signal to the line concentration monitoring control unit 322-2.

  Further, the switching control unit 33 monitors whether or not the power collecting units 32-1 and 32-2 are turned on. The concentrators 32-1 and 32-2 are in a state in which the power is not turned on, for example, when the power is on but the activation fails or when the power suddenly goes down. For this reason, the switching control unit 33 is configured such that when the power of the concentrators 32-1 and 32-2 is off, the power is on but the startup fails, or the power suddenly goes down. 1 and 32-2 are determined to be abnormal. When the switching control unit 33 determines that an abnormality has occurred in either one of the concentrators 32-1 and 32-2, the switching controller 33 outputs a switching signal to the concentrator monitoring controller of the concentrator where no abnormality has occurred. . For example, the switching control unit 33 outputs a switching signal to the line collection monitoring control unit 322-2 when the line collection unit 32-1 including the line collection switch 321-1 during the output operation suddenly goes down.

  The switching control unit 33 also monitors the ports of the gateway processing unit 31 and the baseband units 12-1 to 12-m. When the gateway processing unit 31 receives an uplink IP packet and the status of the port becomes “down”, the switching control unit 33 collects the lines so as to receive a signal at a port other than the port where the abnormality has occurred. Switches between the units 32-1 and 32-2. In addition, when the baseband units 12-1 to 12-m receive the downlink IP packet and the status of the port becomes “down”, the switching control unit 33 uses a port other than the port where the abnormality has occurred. The concentrators 32-1 and 32-2 are switched so as to receive signals.

  As described above, in the second embodiment, the gateway device 30 includes the baseband units 12-1 to 12-m and the concentrators 32-1 and 32-2. And the baseband units 12-1 to 12-m are accommodated by the concentrators 32-1 and 32-2. As a result, a plurality of baseband units can be mounted on one gateway device.

  Therefore, the gateway apparatus according to the present invention can accommodate a plurality of distributed base stations. Further, it is possible to realize cost reduction and space saving when constructing a mobile communication system. Further, when a plurality of gateway devices of this type are connected to the network, the plurality of gateway devices can be centrally managed by IMS (IP Multimedia Subsystem).

[Other Embodiments]
The present invention is not limited to the above embodiments. For example, in each of the above embodiments, the example in which the baseband unit has a configuration as shown in FIG. 3 has been described.

  For example, the baseband unit can be implemented even when it has a configuration as shown in FIG. 6, the baseband unit 13 includes switch units 131-1 and 131-2, MAC (Media Access Control) processing units 132-1 to 132-p (p is a natural number), switch units 133-1 and 133-2, PHY processing units 134-1 to 134-q (q is a natural number) and a monitoring control unit 135 are provided. The number of installed PHY processing units “q” is smaller than the number of installed MAC processing units “p”.

  The switch units 131-1 and 131-2 include a plurality of ports, and are connected to the line concentrators and the MAC processing units 132-1 to 132-p through these ports. One of the switch units 131-1 and 131-2 is selectively driven in accordance with a switching signal from a monitoring control unit 135 described later. Of the switch units 131-1 and 131-2, the driving switch unit records a status indicating whether or not a signal has been received for each port. For example, when a signal from the concentrating unit is received, the driving switch unit sets the status of the port to “up”, and if no signal is input to the port within a predetermined period, sets the status of the port to “down”. "

  One of the switch units 133-1 and 133-2 is selectively driven in accordance with a switching signal from the monitoring control unit 135. Among the switch units 133-1 and 133-2, the active switch unit includes a port to which the PHY processing units 134-1 to 134-q are connected and a port to which the MAC processing units 132-1 to 132-p are connected. Are linked with each other. Further, the driving switch unit records a status indicating whether or not a signal is received for each port.

  Each of the MAC processing units 132-1 to 132-p is associated with one of the PHY processing units 134-1 to 134-q by the switch units 133-1 and 133-2. The MAC processing unit associated with the PHY processing units 134-1 to 134-q performs MAC processing on the received signal according to the MAC protocol. At this time, since p> q, (p−q) MAC processing units are not operating. Further, the MAC processing unit associated with the PHY processing units 134-1 to 134-q records a status indicating whether or not a signal has been received for each port.

  In addition, when the MAC processing unit that is performing the MAC processing among the MAC processing units 132-1 to 132-p receives a MAC processing switching signal described later from the monitoring control unit 135, the MAC processing unit stops the MAC processing. In addition, the MAC processing unit that is not operating among the MAC processing units 132-1 to 132-p performs MAC processing when receiving a MAC processing switching signal from the monitoring control unit 135.

  Further, the MAC processing units 132-1 to 132-p include an abnormality detection unit 1321 that detects an abnormality in its own MAC processing. The abnormality detection unit 1321 outputs an abnormality signal to the monitoring control unit 135 when an abnormality is detected.

  The PHY processing units 134-1 to 134-q perform modulation / demodulation, photoelectric conversion, and the like for wireless transmission on signals received from the physical layer. The PHY processing units 134-1 to 134-q each accommodate a plurality of distributed base stations, and perform transmission / reception of radio signals by these distributed base stations. The PHY processing units 134-1 to 134-q record a status indicating whether or not a signal has been received for each port.

  When the mobile communication system is activated, the monitoring control unit 135 switches the switch units 131-1 and 131-2, the MAC processing units 132-1 to 132-p, the switch units 133-1 and 133-2, and the PHY processing unit 134-1. Monitor the status of the ports at ~ 134-q. When there is a port whose status is “down”, the monitoring control unit 135 switches the switch units 131-1 and 131-2 according to the situation, and the switch units 133-1 and 133- 2 or a MAC processing switching signal for driving a non-operating MAC processing unit in place of the MAC processing unit in which an abnormality has occurred.

  In addition, when the monitoring control unit 135 receives an abnormality signal from the abnormality detection unit of the MAC processing units 132-1 to 132-p, the monitoring control unit 135 outputs the MAC processing switching signal to thereby change the MAC processing unit from which the abnormality signal is generated. Stop and drive the non-operating MAC processor.

  In addition, the monitoring control unit 135 determines whether the ports of the switch units 131-1 and 131-2, the MAC processing units 132-1 to 132-p, and the switch units 133-1 and 133-2 are normally started up when the system is started up. To monitor. If the port has not started up normally, the monitoring control unit 135 switches the connection to an empty port in the component and issues an instruction to start up the port after switching.

  For example, if any one of the ports of the switch units 131-1, 131-2, 133-1, and 133-2 has not started up normally, the monitoring control unit 135 sets the free port in the switch unit. Switch the connection and issue an instruction to bring up the new port.

  In addition, when any of the ports of the MAC processing units 132-1 to 132-p is not normally started, the monitoring control unit 135 switches the switch units 131-1, 131-2, 113-1, The connection is switched to any one of 113-2, and an empty port in the same MAC processing unit is started up.

  Since the baseband unit 13 has the above-described configuration, it is possible to detect a device in which an abnormality has occurred when the system is started and to drive a normal device instead. That is, it is possible to change the signal transmission path in the baseband unit 13 so as not to create a non-interruption section.

  Further, the baseband unit 13 ensures that the system is started by switching the device to a normal device even if there is a device in which an abnormality has occurred in the unit. Therefore, even if any of the devices in the baseband unit breaks down in the event of a disaster, the system can be started up as long as the minimum devices necessary for starting up the system are normal. That is, according to the baseband unit 13, it is easy to establish communication connection between wireless terminals at the time of disaster.

  Further, in the baseband unit 13, the monitoring control unit 135 monitors whether or not the component ports are normally started up when the system is started. Then, if the port does not start up normally, the monitoring control unit 135 instructs the component to switch the connection to an empty port and activate the port after switching. As a result, the port is activated normally, and the connection with the PHY processing units 134-1 to 134-q can be ensured.

  Furthermore, the present invention can be embodied by modifying the constituent elements without departing from the spirit of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

DESCRIPTION OF SYMBOLS 10 ... Base station system 11-1, 11-2 ... Concentration part 111-1, 111-2 ... Concentration switch 112-1, 112-2 ... Concentration monitoring control part 12-1 to 12-m ... Baseband unit 121 ... MAC processing unit 122 ... PHY processing unit 20, 30 ... Gateway device 31 ... Gateway processing units 32-1, 32-2 ... Concentration units 321-1, 321-2 ... Concentration switches 322-1, 322-2 ... Concentration monitoring control Unit 33 ... Switching control unit MS ... Mobile terminals BS1 to BSn ... Distributed base station NW1 ... IP network NW2 ... PSTN

Claims (8)

In a base station system that connects to a gateway device and receives a downlink IP (Internet Protocol) signal with a destination address from the gateway device,
A first local area network (LAN) switch that receives an IP signal from the gateway device via a first port of the first LAN switch, and transmits the IP signal to the other LAN switches in the first LAN switch; A first concentrator that outputs from a port corresponding to the destination address among a plurality of ports;
A plurality of baseband units each connected to the other plurality of ports and converting an IP signal from the first concentrator into a radio signal;
A plurality of distributed base stations connected to each of the plurality of baseband units, the base station comprising: a distributed base station that transmits radio signals from the plurality of baseband units to space; Station system. A second LAN switch, connected to the gateway device by a first port of the second LAN switch, and connected to the plurality of baseband units by a plurality of other ports of the second LAN switch; Further comprising two concentrators,
When any one of the first and second concentrators transmits the IP signal and an abnormality occurs in the concentrator that transmits the IP signal among the first and second concentrators, the other 2. The base station system according to claim 1, wherein the concentrator section is switched to transmit the IP signal. The first LAN switch monitors reception states of uplink IP signals and downlink IP signals from the plurality of baseband units, and an abnormality has occurred when an abnormality has occurred in the reception state. An abnormal signal indicating
The first concentrator stops the operation of the first LAN switch in response to an abnormal signal from the first LAN switch, and sends the downlink IP signal and the up signal to the second concentrator. A first concentration monitoring control unit that issues an instruction to transmit the IP signal of the link;
The second LAN switch monitors reception states of uplink IP signals and downlink IP signals from the plurality of baseband units, and an abnormality has occurred when an abnormality has occurred in the reception state. An abnormal signal indicating
The second concentrator stops the operation of the second LAN switch in response to an abnormal signal from the second LAN switch, and transmits the downlink IP signal and the up signal to the first concentrator. 3. The base station system according to claim 2, further comprising a second concentration monitoring control unit that issues an instruction to transmit the IP signal of the link. The first concentrator monitoring controller determines whether the second concentrator is powered on, and the power is on when the second concentrator is transmitting the IP signal. If not, let the first LAN switch transmit the IP signal,
The second line collection monitoring control unit determines whether the first line collection unit is powered on, and the power is turned on when the first line collection unit transmits the IP signal. The base station system according to claim 3, wherein if it is determined that there is no, the second LAN switch transmits the IP signal. A gateway processing unit for connecting to a network and outputting a downlink IP (Internet Protocol) signal with a destination address based on a data signal from the network;
A first local area network (LAN) switch that receives an IP signal from the gateway processing unit via a first port of the first LAN switch, and transmits the IP signal to the other in the first LAN switch; A first concentrator that outputs from a port corresponding to the destination address among the plurality of ports;
A plurality of basebands each connected to the plurality of other ports, converting the IP signal from the first concentrator into a radio signal, and outputting the radio signal to a plurality of distributed base stations that transmit to the space A gateway device comprising: a unit. A second LAN switch, connected to the gateway processing unit by a first port of the second LAN switch, and connected to the plurality of baseband units by a plurality of other ports of the second LAN switch; Further comprising a second concentrator,
When any one of the first and second concentrators transmits the IP signal and an abnormality occurs in the concentrator that transmits the IP signal among the first and second concentrators, the other The gateway apparatus according to claim 5, wherein the concentrator section is switched to transmit the IP signal. The first LAN switch monitors reception states of uplink IP signals and downlink IP signals from the plurality of baseband units, and an abnormality has occurred when an abnormality has occurred in the reception state. An abnormal signal indicating
The first concentrator stops the operation of the first LAN switch in response to an abnormal signal from the first LAN switch, and sends the downlink IP signal and the up signal to the second concentrator. A first concentration monitoring control unit that issues an instruction to transmit the IP signal of the link;
The second LAN switch monitors reception states of uplink IP signals and downlink IP signals from the plurality of baseband units, and an abnormality has occurred when an abnormality has occurred in the reception state. An abnormal signal indicating
The second concentrator stops the operation of the second LAN switch in response to an abnormal signal from the second LAN switch, and transmits the downlink IP signal and the up signal to the first concentrator. The gateway apparatus according to claim 6, further comprising a second concentration monitoring control unit that issues an instruction to transmit the IP signal of the link. The first concentrator monitoring controller determines whether the second concentrator is powered on, and the power is on when the second concentrator is transmitting the IP signal. If not, let the first LAN switch transmit the IP signal,
The second line collection monitoring control unit determines whether the first line collection unit is powered on, and the power is turned on when the first line collection unit transmits the IP signal. 8. The gateway device according to claim 7, wherein if it is determined that the IP signal is not transmitted, the IP signal is transmitted to the second LAN switch.

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