WO2011090013A1 - Mobile communication system, routing device, communication control method and routing method - Google Patents

Mobile communication system, routing device, communication control method and routing method Download PDF

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Publication number
WO2011090013A1
WO2011090013A1 PCT/JP2011/050713 JP2011050713W WO2011090013A1 WO 2011090013 A1 WO2011090013 A1 WO 2011090013A1 JP 2011050713 W JP2011050713 W JP 2011050713W WO 2011090013 A1 WO2011090013 A1 WO 2011090013A1
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Prior art keywords
base station
radio base
communication
mobile device
routing
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PCT/JP2011/050713
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French (fr)
Japanese (ja)
Inventor
努 塚越
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日本電気株式会社
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Priority to JP2011550905A priority Critical patent/JPWO2011090013A1/en
Publication of WO2011090013A1 publication Critical patent/WO2011090013A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a mobile communication system, a routing device, a communication control method, and a routing method having a plurality of radio base stations having different data communication speeds.
  • 3GPP has formulated specifications for LTE (Long Term Evolution) / EPC (Evolved Packet Core) systems as a 3.9th generation mobile communication system in order to realize higher speed and wider bandwidth of networks.
  • the specifications are disclosed in “3GPP TS 23.401 (hereinafter referred to as non-patent document 1)” and “3GPP TS 23.402 (hereinafter referred to as non-patent document 2)”.
  • configuration examples of the third generation mobile communication system and the 3.9th generation mobile communication system are disclosed in Japanese Unexamined Patent Application Publication No. 2009-524324 (hereinafter referred to as Patent Document 1).
  • the third-generation mobile phone network (hereinafter referred to as 3G network) based on the third-generation mobile communication system has already been widely spread and is considered to be used for the time being.
  • a 3.9th generation mobile phone network (hereinafter referred to as a 3.9G network) based on a 3.9th generation mobile communication system is first developed around an area where communication traffic is concentrated, and then It is thought that it will be rolled out nationwide in stages.
  • the 3rd generation A mobile communication system can also be used.
  • the above-described 3.9th generation mobile communication system provides a broadband service with a downlink communication speed of 100 Mbps or more and an uplink communication speed of 50 Mbps or more. Is not necessary.
  • the wireless resources and the wired resources of the 3.9G network are allocated to the low-speed data communication. Therefore, there has been a problem that the wireless network and the wired resource cannot be efficiently used as the entire network.
  • One object of the present invention is to provide a technique for efficiently using communication resources in a network in a mobile communication system having a plurality of radio base stations having different data communication speeds.
  • a mobile communication system is a mobile communication system having a plurality of radio base stations, the first radio base station capable of radio communication with a mobile device, and data communication from the first radio base station.
  • a second wireless base station that is low in speed and capable of wireless communication with a mobile device; and a routing device connected to the first wireless base station and the second wireless base station.
  • the routing device routes data transmitted and received by the mobile device via the first radio base station when the first radio base station relays communication between the mobile device and the own device.
  • the second wireless base station should relay the communication between the mobile device and its own device when the throughput calculated within a predetermined time is equal to or less than a predetermined threshold.
  • the base station receives the connection request When, in which relays communication between the mobile station and the routing device.
  • a gateway device is a routing device connected to a plurality of radio base stations, and is connected to a first radio base station capable of radio communication with a mobile device, and the first radio base When the first radio base station relays communication between the mobile device and its own device when the data communication speed is lower than that of the station and connected to the second radio base station capable of radio communication with the mobile device.
  • a communication means for routing data transmitted / received by a mobile device via one radio base station and calculating a throughput of the routed data, and a throughput calculated within a predetermined time being equal to or less than a predetermined threshold Determining whether the second radio base station should relay communication between the mobile device and the own device based on whether or not the communication between the mobile device and the own device by the determining means;
  • the second nothing Control means for controlling to switch the radio base station that relays communication between the mobile device and its own device from the first radio base station to the second radio base station when it is determined that the base station should relay Have.
  • a communication control method includes a first radio base station capable of wireless communication with a mobile device, and a second wireless communication with a mobile device having a lower data communication speed than the first wireless base station. And a routing apparatus connected to the first radio base station and the second radio base station, the communication control method for a mobile communication system comprising: When the first radio base station relays communication between the mobile station, the data transmitted and received by the mobile device via the first radio base station is routed, and the throughput of the routed data is calculated and determined in advance. When the throughput calculated within the time is equal to or less than a predetermined threshold, it is determined that the second radio base station should relay communication between the mobile device and the own device, and between the mobile device and the own device.
  • Terminate communication relay A disconnection request for transmission to the first radio base station, and a connection request for relaying communication between the mobile device and its own device is transmitted to the second radio base station.
  • the communication between the mobile device and the routing device is relayed, if the disconnection request is received, the relay is terminated, and when the second radio base station receives the connection request, It relays communication.
  • a routing method is a routing method for routing data transmitted / received by a mobile device via a radio base station, wherein the throughput of data transmitted / received to / from the mobile device via a first radio base station is reduced.
  • the base station that relays data transmitted and received with the mobile device is switched to a second radio base station having a data communication speed different from that of the first radio base station. It is.
  • FIG. 1 is a block diagram showing the configuration of the mobile communication system of the present embodiment.
  • FIG. 2 is a block diagram showing the configuration of the routing device of this embodiment.
  • FIG. 3 shows the routing device 110, the first radio base station 130, and the second radio base when the radio base station that relays communication between the mobile device 150 and the routing device 110 is switched in the mobile communication system shown in FIG.
  • FIG. 6 is a sequence diagram showing processing procedures of a station 140 and a mobile device 150.
  • FIG. 4 is a block diagram showing the configuration of an embodiment of the mobile communication system of the present invention.
  • FIG. 5 is a sequence diagram showing processing procedures of eNB1 1 , MME2, SGW3 1 , NodeB5, RNC6, SGSN7 and UE8 when switching the radio base station that relays the communication session by UE8 in the mobile communication system shown in FIG. .
  • FIG. 1 is a block diagram showing the configuration of the mobile communication system of the present embodiment.
  • the mobile communication system 100 of this embodiment includes a routing device 110, a first radio base station 130, and a second radio base station 140.
  • a first radio base station 130 and a second radio base station 140 are connected to the routing device 110.
  • the routing device 110, the first radio base station 130, and the second radio base station 140 are, for example, an LSI (Large Scale Integration) composed of logic circuits or the like, or a CPU (Central Processing Unit) or a DSP (Digital Signal Processor). ) And the like, and the semiconductor integrated circuit has various functions described below.
  • the routing device 110, the first radio base station 130, and the second radio base station 140 are provided with a CPU and a DSP, the CPU and the DSP execute processing according to a program recorded on a recording medium (not shown). This realizes the functions described below.
  • the mobile device 150 is a mobile terminal such as a mobile phone or a PHS (Personal Handyphone System).
  • a mobile terminal such as a mobile phone or a PHS (Personal Handyphone System).
  • the first radio base station 130 is a radio base station capable of radio communication with the mobile device 150 and has a function of relaying communication between the mobile device 150 and the routing device 110.
  • the second radio base station 140 is a radio base station having a data communication speed lower than that of the first radio base station 130 and capable of radio communication with the mobile device 150, and performs communication between the mobile device 150 and the routing device 110. Has a relay function.
  • the routing device 110 is connected to the first radio base station 130 and the second radio base station 140, and further connected to another mobile communication system (not shown).
  • the routing device 110 has a function of routing data transmitted and received between the first radio base station 130 and the second radio base station 140 and another mobile communication system (not shown). Further, the routing device 110 has a function of controlling a communication session between the first radio base station 130 and the second radio base station 140.
  • the mobile device 150 when the mobile device 150 wirelessly communicates with the first radio base station 130, the mobile device 150 is connected to another device (not shown) via the first radio base station 130 and the routing device 110. Connected to the mobile communication system.
  • the mobile device 150 when the mobile device 150 communicates with the second radio base station 140 by radio, the mobile device 150 is connected to another mobile communication system (not shown) via the second radio base station 140 and the routing device 110. . In any case, the routing device 110 becomes an anchor point.
  • the radio resources and the wired resources of the first radio base station 130 (hereinafter, these resources are referred to as communication resources). Is assigned to low-speed data communication, the use efficiency of communication resources of the entire network is deteriorated.
  • the routing device 110 is based on the throughput of data transmitted and received by the mobile device 150 when the first radio base station 130 relays communication between the mobile device 150 and its own device. It is determined whether or not the second radio base station 140 should relay communication between the mobile device 150 and its own device.
  • FIG. 2 is a block diagram showing the configuration of the routing device of this embodiment.
  • the routing device 110 includes a communication unit 111, a determination unit 112, and a control unit 113.
  • the communication unit 111 is connected to the first radio base station 130 and the second radio base station 140, and further connected to another mobile communication system (not shown).
  • the communication unit 111 routes data transmitted / received via the first radio base station 130, the second radio base station 140, or another mobile communication system (not shown).
  • the communication unit 111 calculates the throughput of data transmitted / received by the mobile device 150 when the first radio base station 130 relays communication between the mobile device 150 and its own device, and indicates the calculated throughput. Information is transmitted to the determination unit 112.
  • the determination unit 112 determines whether the second radio base station 140 should relay communication between the mobile device 150 and the own device based on the received throughput information. .
  • Examples of communication sessions by the mobile device 150 include voice communication with other mobile devices, access to a Web server, reception of video data from a video distribution server, and the like. Since each communication session is realized by packet communication, the throughput of transmitted / received data is not constant. However, in a communication session in which a large amount of data is transmitted / received, there is a low possibility that a low throughput state will continue for a long time.
  • the determination unit 112 determines whether the mobile device 150 and the own device It is determined that the second radio base station 140 should relay the communication between them.
  • the determining unit 112 switches the radio base station that relays the communication between the mobile device 150 and the own device. Is sent to the control unit 113.
  • the switching request includes address information of the mobile device 150 and session information indicating all communication sessions by the mobile device 150.
  • control unit 113 When the control unit 113 receives a switching request from the determination unit 112, the control unit 113 controls switching of a radio base station that relays communication between the mobile device 150 and the own device.
  • the control unit 113 first transmits a disconnection request for ending relay of communication between the mobile device 150 and its own device to the first radio base station 130.
  • the disconnect request includes address information and session information of the mobile device 150.
  • the first radio base station 130 that has received the disconnection request ends the relay of communication between the mobile device 150 and the routing device 110 and returns a disconnection response to the control unit 113.
  • control unit 113 transmits a connection request for relaying communication between the mobile device 150 and the own device to the second radio base station 140.
  • the connection request includes address information of the mobile device 150 and session information.
  • the second radio base station 130 that has received the connection request relays communication between the mobile device 150 and the routing device 110 and returns a connection response to the control unit 113.
  • control unit 113 switches the radio base station that relays communication between the mobile device 150 and its own device from the first radio base station 130 to the second radio base station 140.
  • the routing device 110 the first radio base station 130, and the second radio base station when the radio base station that relays communication between the mobile device 150 and the routing device 110 is switched in the mobile communication system shown in FIG.
  • the processing procedure of 140 and the mobile device 150 will be described.
  • FIG. 3 shows the routing device 110, the first radio base station 130, and the second radio base when the radio base station that relays communication between the mobile device 150 and the routing device 110 is switched in the mobile communication system shown in FIG.
  • FIG. 6 is a sequence diagram showing processing procedures of a station 140 and a mobile device 150.
  • the mobile device 150 is assumed to be connected to another mobile communication system (not shown) via the first radio base station 130 and the routing device 110 (step S1).
  • the communication unit 111 of the routing device 110 calculates the throughput of data transmitted and received by the mobile device 150 (step S2), and transmits throughput information indicating the calculated throughput to the determination unit 112.
  • the determination unit 112 determines whether the second radio base station 140 should relay communication between the mobile device 150 and the own device based on the received throughput information. (Step S3). When the throughput shown in all throughput information received from the communication unit 111 at a predetermined time is equal to or less than a predetermined threshold, the determination unit 112 performs communication between the mobile device 150 and its own device. It is determined that the radio base station 140 should relay. When determining that the second radio base station 140 should relay communication between the mobile device 150 and its own device, the determination unit 112 transmits a switching request including the address information and session information of the mobile device 150 to the control unit 113. To do.
  • the control unit 113 When receiving the switching request from the determination unit 112, the control unit 113 transmits a disconnection request including the address information and session information of the mobile device 150 to the first radio base station 130 (step S4), and the address of the mobile device 150.
  • a connection request including information and session information is transmitted to the second radio base station 140 (step S5).
  • the first radio base station 130 When receiving the disconnection request from the control unit 113 of the routing device 110, the first radio base station 130 ends the relay of communication between the mobile device 150 and the routing device 110, and returns a disconnection response to the control unit 113 ( Step S6).
  • the second radio base station 140 When receiving the connection request from the control unit 113 of the routing device 110, the second radio base station 140 relays communication between the mobile device 150 and the routing device 110 and returns a connection response to the control unit 113. (Step S7).
  • the mobile device 150 is connected to another mobile communication system (not shown) via the second radio base station 140 and the routing device 110 (step S8).
  • the first radio base station 130 releases communication resources used in the communication session of the mobile device 150 (step S9).
  • the routing device 110 transmits a request to switch the radio base station that relays communication between the mobile device 150 and the own device to the first radio base station 130 and the second radio base station 140.
  • the routing device 110 may transmit a request for switching a radio base station that relays communication between the mobile device 150 and the mobile device 150 to the mobile device 150.
  • the routing apparatus 110 transmits a request for switching the radio base station that performs radio communication to the second radio base station 140 to the mobile device 150 via the first radio base station 130.
  • the mobile device 150 that has received the request switches the radio base station with which the mobile device 150 performs radio communication from the first radio base station 130 to the second radio base station 140.
  • the routing device 110 when the throughput of data transmitted / received by the mobile device 150 is equal to or less than a predetermined threshold for a predetermined time, between the mobile device 150 and its own device.
  • the second radio base station 140 determines that the communication should be relayed.
  • the routing device 110 performs communication between the mobile device 150 and its own device when the average value of the predetermined time of the throughput of data transmitted and received by the mobile device 150 is equal to or less than a predetermined threshold. It may be determined that the second radio base station 140 should relay.
  • the routing device when a wireless base station with a high data communication speed relays communication between a mobile device and its own device, the routing device transmits / receives data transmitted / received by the mobile device. To calculate the throughput. When the throughput calculated within a predetermined time is equal to or less than a predetermined threshold, the routing device should relay communication between the mobile device and the own device with a radio base station having a low data communication speed. Determine and control the switching of radio base stations.
  • the routing device can appropriately select a radio base station that should relay communication between the mobile device and its own device based on the throughput of data transmitted and received by the mobile device.
  • the mobile communication system can allocate low-speed data communication to a radio base station with a low communication speed, and can allocate high-speed data communication to a radio base station with a high communication speed, thereby efficiently using communication resources in the network. it can.
  • FIG. 4 is a block diagram showing the configuration of an embodiment of the mobile communication system of the present invention.
  • the mobile communication system of the present embodiment includes a UE (User Equipment) 8, an LTE (Long Term Evolution) network 10 which is a radio access network of the 3.9G network, and a core of the 3.9G network.
  • the network includes an EPC (Evolved Packet Core) 11 that is an upper network of the LTE network 10 and a W-CDMA network 12 that forms a 3G network.
  • the EPC 11 is connected to the LTE network 10 to form a 3.9G network.
  • the EPC 11 is also connected to the W-CDMA network 12.
  • the W-CDMA network 12 includes a NodeB 5, an RNC (Radio Network Controller) 6, and an SGSN (Serving General packet radio service Support Node) 7.
  • the LTE network 10 includes a plurality of eNBs (evolved Node B) 1 1 and 1 2 .
  • the EPC 11 includes an MME (Mobility Management Entity) 2, a plurality of SGWs (Serving Gateways) 3 1 and 3 2, and a PGW (Packet Data Network Gateway) 4.
  • MME Mobility Management Entity
  • SGWs Serving Gateways
  • PGW Packet Data Network Gateway
  • eNB1 1 , eNB1 2 , MME2, SGW3 1 , SGW3 2 , PGW4, NodeB5, RNC6 and SGSN7 include, for example, an LSI composed of a logic circuit or the like, or a semiconductor integrated circuit such as a CPU or DSP, It has various functions described below.
  • the eNB 1 1 , eNB 1 2 , MME 2 , SGW 3 1 , SGW 3 2 , PGW 4, Node B 5, RNC 6, and SGSN 7 are equipped with a CPU or DSP, the CPU or DSP performs processing according to a program recorded on a recording medium (not shown). By executing this function, the following functions are realized.
  • UE8 is a mobile terminal such as a mobile phone or PHS.
  • eNB1 1 and eNB1 2 are connected to MME2 and SGW3 1 and SGW3 2 of EPC11, respectively.
  • eNB1 1 and eNB1 2 are LTE advanced radio base stations capable of radio communication with UE8, and have a function of managing communication resources used in a communication session by UE8 and a mobility management function of UE8.
  • the MME 2 is connected to the SGW 3 1 and SGW 3 2 , connected to the SGSN 7 of the W-CDMA network 12, and connected to the eNB 1 1 and eNB 1 2 of the LTE network 10.
  • the MME 2 has a function of controlling communication sessions of the eNB 1 1 and the eNB 1 2 .
  • SGW 3 1 and SGW 3 2 are connected to PGW 4, connected to SGSN 7 of W-CDMA network 12, and connected to eNB 1 1 and eNB 1 2 of LTE network 10.
  • the SGW 3 1 and SGW 3 2 have a function of routing data transmitted and received by the SGSN 7 and data transmitted and received by the eNB 1 1 and eNB 1 2 .
  • the PGW 4 is connected to an ISP (Internet Services Provider) or a corporate LAN (Local Area Network) (not shown), and further connected to the SGW 3 1 and the SGW 3 2 .
  • the PGW 4 relays data transmitted / received between the ISP or the corporate LAN and the SGW 3 1 and SGW 3 2 .
  • Node B5 is connected to RNC6.
  • Node B 5 is a W-CDMA wireless base station capable of wireless communication with UE 8.
  • RNC 6 is connected to Node B 5 and further connected to SGSN 7.
  • the RNC 6 has a function of managing the radio resources of the NodeB 5.
  • the SGSN 7 is connected to RNC 6 and further connected to SGW 3 1 and SGW 3 2 of EPC 11 .
  • the SGSN 7 has a function of routing data transmitted and received by the UE 8 via the NodeB 5 and the RNC 6.
  • the SGW 3 1 and SGW 3 2 of this embodiment have the functions of the communication unit 111 and the determination unit 112 of the routing device 110, and the MME 2 has the function of the control unit 113 of the routing device 110.
  • ENB1 1 and eNB1 2 correspond to the first radio base station 130
  • NodeB 5 corresponds to the second radio base station 140
  • UE 8 corresponds to the mobile device 150.
  • eNB1 1 , eNB1 2 , SGW3 1 , SGW3 2 are not limited to the numbers shown in FIG. Moreover, the number of NodeB5 and RNC6 is not restricted to one, and may be plural.
  • the UE 8 when the UE 8 wirelessly communicates with the eNB 1 1 of the LTE network 10, the UE 8 is connected to an ISP or a corporate LAN (not shown) via the eNB 1 1 , SGW 3 1 (or SGW 3 2 ), and PGW 4. Is done.
  • the UE 8 when the UE 8 performs radio communication with the Node B 5 of the W-CDMA network 12, the UE 8 is connected to an ISP or a corporate LAN (not shown) via the Node B 5, the RNC 6, the SGSN 7, the SGW 3 1 (or SGW 3 2 ), and the PGW 4.
  • SGW3 1 (or SGW3 2 ) is an anchor point.
  • the SGW 3 1 and the SGW 3 2 calculate the throughput of data transmitted and received by the UE 8 when the eNB 1 1 or the eNB 1 2 relays communication between the UE 8 and the own device.
  • the SGW 3 1 and the SGW 3 2 determine that the Node B 5 should relay the communication between the UE 8 and the own device when the throughput calculated within the predetermined time is equal to or less than the predetermined threshold.
  • the SGW 3 1 and the SGW 3 2 determine that the NodeB 5 should relay the communication between the UE 8 and the own device
  • the SGW 3 1 and the SGW 3 2 transmit a switching request for switching the radio base station that relays the communication between the UE 8 and the own device to the MME 2. .
  • the MME 2 When the MME 2 receives the switching request from the SGW 3 1 or the SGW 3 2, the MME 2 controls switching of the radio base station that relays the communication between the UE 8 and the own device.
  • FIG. 5 is a sequence diagram showing processing procedures of eNB1 1 , MME2, SGW3 1 , NodeB5, RNC6, SGSN7 and UE8 when switching the radio base station that relays the communication session by UE8 in the mobile communication system shown in FIG. .
  • the UE 8 is assumed to be connected to an ISP or a corporate LAN (not shown) via the eNB 1 1 , the SGW 3 1, and the PGW 4 (Step S 21).
  • the solid line in the figure indicates the flow of user data, and the dotted line indicates the flow of control signals.
  • User data is transmitted / received via eNB1 1 and SGW3 1
  • control signals are transmitted / received via eNB1 1 , MME2 and SGW3 1 .
  • the SGW 3 1 calculates the throughput of data transmitted and received by the UE 8 (step S22).
  • the SGW 3 1 determines whether or not the Node B 5 should relay the communication between the UE 8 and the own device based on the calculated throughput (step S23). If predetermined throughput calculated in the time is not greater than the predetermined threshold value, determines that SGW3 1 is to be relayed is NodeB5 communication between the own apparatus and UE8. If it is determined that the NodeB 5 should relay the communication between the UE 8 and the own device, the SGW 31 transmits a switching request including the address information and session information of the UE 8 to the MME 2 (step S24).
  • the MME 2 When receiving the switching request from the SGW 3 1 , the MME 2 transmits to the eNB 1 1 a session switching request for switching the base station that relays all communication sessions by the UE 8 (step S 24).
  • the session switching request includes the address information and session information of UE8.
  • the eNB 1 1 determines whether or not all communication sessions of the UE 8 can be released. eNB1 1, when it releases all of the communication session UE8, returns a session switching response to the MME2 (step S25).
  • MME2 Upon receiving a session switching response from eNB1 1, MME2 executes Inter-RAT Relocation process defined by 3GPP (step S26). Through the Inter-RAT Relocation process, the MME 2 switches the radio base station that relays communication between the UE 8 and the own apparatus from the eNB 11 to the Node B 5. Thereby, all communication sessions of the UE 8 are established in the W-CDMA network 12 and released from the LTE network 10.
  • SGW3 1 becomes an anchor point of the communication session of UE8.
  • the Inter-RAT Relocation processing is performed after the MME receives the “Handover Required” message from the eNodeB, as shown in “5.5.2.1 E-UTRAN to UTRAN Iu mode Inter RAT handover” in Non-Patent Document 1. This corresponds to processing, and detailed description thereof is omitted here.
  • UE8 is, NodeB5, RNC6, SGSN7, SGW3 through one and PGW4, connected to the ISP or corporate LAN (not shown).
  • the mobile communication system can be applied to an area where the 3.9G network and the 3G network coexist.
  • the mobile communication system can allocate low-speed data communication to the W-CDMA radio base station, and can allocate high-speed data communication to the LTE radio base station, thereby efficiently using communication resources in the network. it can.

Abstract

Disclosed is a mobile communication system (100) comprising a routing device (110) and a plurality of wireless base stations (130 and 140) of different data communication speeds. The routing device (110), when a wireless base station (130) of high data communication speed is relaying data between a mobile unit and the routing device (110), calculates the throughput of data transmitted and received by the mobile unit. If the throughput calculated within a pre-defined time is less than or equal to a pre-defined threshold, the routing device (110) determines that communication between the mobile unit and the routing device (110) should be relayed by a wireless base station (140) of low data communication speed, and controls switching of the wireless base station.

Description

移動通信システム、ルーティング装置、通信制御方法およびルーティング方法Mobile communication system, routing apparatus, communication control method, and routing method
　本発明は、データ通信速度の異なる複数の無線基地局を有する移動通信システム、ルーティング装置、通信制御方法およびルーティング方法に関する。 The present invention relates to a mobile communication system, a routing device, a communication control method, and a routing method having a plurality of radio base stations having different data communication speeds.
　現在、３ＧＰＰ（3rd　Generation　Partnership　Project）によって策定されたＷ－ＣＤＭＡ（Wideband　Code　Division　Multiple　Access）方式を用いた、第３世代の移動通信システムが普及している。 Currently, third-generation mobile communication systems using the W-CDMA (Wideband Code Division Multiple Access) method formulated by 3GPP (3rd Generation Partnership Project) are in widespread use.
　一方、３ＧＰＰは、ネットワークのさらなる高速化・広帯域化を実現するため、第３．９世代の移動通信システムとして、ＬＴＥ（Long　Term　Evolution）／ＥＰＣ（Evolved　Packet　Core）システムの仕様を策定した。その仕様が、「３ＧＰＰ　ＴＳ　２３．４０１（以下では、非特許文献１と称する）」および「３ＧＰＰ　ＴＳ　２３．４０２（以下では、非特許文献２と称する）」に開示されている。また、第３世代の移動体通信システムおよび第３．９世代の移動体通信システムの構成例が、特開２００９－５２４３２４号（以下では、特許文献１と称する）に開示されている。 On the other hand, 3GPP has formulated specifications for LTE (Long Term Evolution) / EPC (Evolved Packet Core) systems as a 3.9th generation mobile communication system in order to realize higher speed and wider bandwidth of networks. The specifications are disclosed in “3GPP TS 23.401 (hereinafter referred to as non-patent document 1)” and “3GPP TS 23.402 (hereinafter referred to as non-patent document 2)”. Also, configuration examples of the third generation mobile communication system and the 3.9th generation mobile communication system are disclosed in Japanese Unexamined Patent Application Publication No. 2009-524324 (hereinafter referred to as Patent Document 1).
　第３世代の移動体通信システムに基づく第３世代携帯電話ネットワーク（以下では、３Ｇネットワークと称する）は、既に広く普及しており、当面は継続して使用されるものと考えられる。一方、第３．９世代の移動体通信システムに基づく第３．９世代携帯電話ネットワーク（以下では、３．９Ｇネットワークと称する）は、まず、通信トラフィックが集中するエリアを中心に展開され、その後段階的に全国に展開されるものと考えられる。つまり、３．９Ｇネットワークは、既に普及している３Ｇネットワークに対して、サービスエリアを重畳する形で展開されるため、第３．９世代の移動通信システムが利用できるエリアでは、第３世代の移動通信システムも利用できることになる。 The third-generation mobile phone network (hereinafter referred to as 3G network) based on the third-generation mobile communication system has already been widely spread and is considered to be used for the time being. On the other hand, a 3.9th generation mobile phone network (hereinafter referred to as a 3.9G network) based on a 3.9th generation mobile communication system is first developed around an area where communication traffic is concentrated, and then It is thought that it will be rolled out nationwide in stages. In other words, since the 3.9G network is deployed in such a manner that the service area is superimposed on the already popular 3G network, in the area where the 3.9th generation mobile communication system can be used, the 3rd generation A mobile communication system can also be used.
　３．９Ｇネットワークと３Ｇネットワークが共存するエリアにおいて、３．９Ｇネットワークの無線通信品質が劣化した場合に３．９Ｇネットワークを介した通信セッションを３Ｇネットワークへ移行するためのＩｎｔｅｒ－ＲＡＴ　ＨａｎｄＯｖｅｒが３ＧＰＰによって規定されている（非特許文献１参照）。しかし、３ＧＰＰが策定した仕様では、３．９Ｇネットワークの無線通信品質と３Ｇネットワークの無線通信品質がいずれも良好である場合、所定の通信セッションをいずれのネットワークを介して行うべきかが規定されていない。 In the area where 3.9G network and 3G network coexist, Inter-RAT HandOver for transferring communication session via 3.9G network to 3G network when 3GPP wireless communication quality deteriorates by 3GPP (See Non-Patent Document 1). However, the specification established by 3GPP stipulates which network a predetermined communication session should be performed in when both the wireless communication quality of the 3.9G network and the wireless communication quality of the 3G network are good. Absent.
　上述した第３．９世代の移動通信システムは、下り方向の通信速度が１００Ｍｂｐｓ以上であり、上り方向の通信速度が５０Ｍｂｐｓ以上である広帯域サービスを提供するが、全ての通信においてそのような広帯域サービスが必要となるわけではない。３Ｇネットワークを介して通信可能な低速なデータ通信が３．９Ｇネットワークを介して行われると、３．９Ｇネットワークの無線リソースおよび有線リソースが低速なデータ通信に割り当てられることになる。そのため、ネットワーク全体として、無線リソースおよび有線リソースを効率よく利用できないという問題点があった。 The above-described 3.9th generation mobile communication system provides a broadband service with a downlink communication speed of 100 Mbps or more and an uplink communication speed of 50 Mbps or more. Is not necessary. When low-speed data communication that can be performed via the 3G network is performed via the 3.9G network, the wireless resources and the wired resources of the 3.9G network are allocated to the low-speed data communication. Therefore, there has been a problem that the wireless network and the wired resource cannot be efficiently used as the entire network.
　本発明の目的の一つは、データ通信速度の異なる複数の無線基地局を有する移動通信システムにおいて、ネットワーク内の通信リソースを効率よく利用するための技術を提供することである。 One object of the present invention is to provide a technique for efficiently using communication resources in a network in a mobile communication system having a plurality of radio base stations having different data communication speeds.
　本発明の一側面の移動通信システムは、複数の無線基地局を有する移動通信システムであって、移動機と無線通信が可能な第１の無線基地局と、第１の無線基地局よりデータ通信速度が低く、移動機と無線通信が可能な第２の無線基地局と、第１の無線基地局及び第２の無線基地局と接続されるルーティング装置と、を有する。そして、ルーティング装置は、移動機と自装置の間の通信を第１の無線基地局が中継しているとき、移動機が第１の無線基地局を介して送受信するデータをルーティングすると共に、ルーティングしたデータのスループットを算出し、予め定められた時間内で算出されたスループットが予め定められた閾値以下である場合、移動機と自装置の間の通信を第２の無線基地局が中継すべきと判定し、移動機と自装置の間の通信の中継を終了するための切断要求を第１の無線基地局に送信すると共に、移動機と自装置の間の通信を中継するための接続要求を第２の無線基地局に送信し、第１の無線基地局は、移動機とルーティング装置の間の通信を中継しているとき、切断要求を受信すると、中継を終了し、第２の無線基地局は、接続要求を受信すると、移動機とルーティング装置の間の通信を中継するものである。 A mobile communication system according to one aspect of the present invention is a mobile communication system having a plurality of radio base stations, the first radio base station capable of radio communication with a mobile device, and data communication from the first radio base station. A second wireless base station that is low in speed and capable of wireless communication with a mobile device; and a routing device connected to the first wireless base station and the second wireless base station. The routing device routes data transmitted and received by the mobile device via the first radio base station when the first radio base station relays communication between the mobile device and the own device. The second wireless base station should relay the communication between the mobile device and its own device when the throughput calculated within a predetermined time is equal to or less than a predetermined threshold. A connection request for relaying communication between the mobile device and its own device, and transmitting a disconnection request for ending relay of communication between the mobile device and its own device to the first radio base station To the second radio base station, and when the first radio base station receives the disconnection request while relaying communication between the mobile device and the routing device, the first radio base station terminates the relay and receives the second radio base station. The base station receives the connection request When, in which relays communication between the mobile station and the routing device.
　本発明の一側面のゲートウェイ装置は、複数の無線基地局と接続されるルーティング装置であって、移動機と無線通信が可能な第１の無線基地局と接続されると共に、第１の無線基地局よりデータ通信速度が低く、移動機と無線通信が可能な第２の無線基地局と接続され、移動機と自装置の間の通信を第１の無線基地局が中継しているとき、第１の無線基地局を介して移動機が送受信するデータをルーティングすると共に、ルーティングしたデータのスループットを算出する通信手段と、予め定められた時間内で算出されたスループットが予め定められた閾値以下であるか否かに基づいて、移動機と自装置の間の通信を第２の無線基地局が中継すべきか否かを判定する判定手段と、判定手段によって、移動機と自装置の間の通信を第２の無線基地局が中継すべきと判定された場合、移動機と自装置の間の通信を中継する無線基地局を第１の無線基地局から第２の無線基地局へ切り替えるように制御する制御手段と、を有する。 A gateway device according to one aspect of the present invention is a routing device connected to a plurality of radio base stations, and is connected to a first radio base station capable of radio communication with a mobile device, and the first radio base When the first radio base station relays communication between the mobile device and its own device when the data communication speed is lower than that of the station and connected to the second radio base station capable of radio communication with the mobile device. A communication means for routing data transmitted / received by a mobile device via one radio base station and calculating a throughput of the routed data, and a throughput calculated within a predetermined time being equal to or less than a predetermined threshold Determining whether the second radio base station should relay communication between the mobile device and the own device based on whether or not the communication between the mobile device and the own device by the determining means; The second nothing Control means for controlling to switch the radio base station that relays communication between the mobile device and its own device from the first radio base station to the second radio base station when it is determined that the base station should relay Have.
　本発明の一側面の通信制御方法は、移動機と無線通信が可能な第１の無線基地局と、第１の無線基地局よりデータ通信速度が低く、移動機と無線通信が可能な第２の無線基地局と、第１の無線基地局及び第２の無線基地局と接続されるルーティング装置と、を有する移動通信システムの通信制御方法であって、ルーティング装置が、移動機と自装置の間の通信を第１の無線基地局が中継しているとき、第１の無線基地局を介して移動機が送受信するデータをルーティングすると共に、ルーティングしたデータのスループットを算出し、予め定められた時間内で算出されたスループットが予め定められた閾値以下である場合、移動機と自装置の間の通信を第２の無線基地局が中継すべきと判定し、移動機と自装置の間の通信の中継を終了するための切断要求を第１の無線基地局に送信すると共に、移動機と自装置の間の通信を中継するための接続要求を第２の無線基地局に送信し、第１の無線基地局が、移動機とルーティング装置の間の通信を中継しているとき、切断要求を受信すると、中継を終了し、第２の無線基地局が、接続要求を受信すると、移動機とルーティング装置の間の通信を中継するものである。 A communication control method according to one aspect of the present invention includes a first radio base station capable of wireless communication with a mobile device, and a second wireless communication with a mobile device having a lower data communication speed than the first wireless base station. And a routing apparatus connected to the first radio base station and the second radio base station, the communication control method for a mobile communication system comprising: When the first radio base station relays communication between the mobile station, the data transmitted and received by the mobile device via the first radio base station is routed, and the throughput of the routed data is calculated and determined in advance. When the throughput calculated within the time is equal to or less than a predetermined threshold, it is determined that the second radio base station should relay communication between the mobile device and the own device, and between the mobile device and the own device. Terminate communication relay A disconnection request for transmission to the first radio base station, and a connection request for relaying communication between the mobile device and its own device is transmitted to the second radio base station. When the communication between the mobile device and the routing device is relayed, if the disconnection request is received, the relay is terminated, and when the second radio base station receives the connection request, It relays communication.
　本発明の一側面のルーティング方法は、移動機が無線基地局を介して送受信するデータを、ルーティングするルーティング方法であって、第１の無線基地局を介して移動機と送受信するデータのスループットを算出し、スループットが予め定められた閾値以下である場合、移動機と送受信するデータを中継する基地局を、データ通信速度が第１の無線基地局とは異なる第２の無線基地局に切り替えるものである。 A routing method according to an aspect of the present invention is a routing method for routing data transmitted / received by a mobile device via a radio base station, wherein the throughput of data transmitted / received to / from the mobile device via a first radio base station is reduced. When the calculated and throughput is equal to or less than a predetermined threshold, the base station that relays data transmitted and received with the mobile device is switched to a second radio base station having a data communication speed different from that of the first radio base station. It is.
図１は本実施形態の移動通信システムの構成を示すブロック図である。FIG. 1 is a block diagram showing the configuration of the mobile communication system of the present embodiment. 図２は本実施形態のルーティング装置の構成を示すブロック図である。FIG. 2 is a block diagram showing the configuration of the routing device of this embodiment. 図３は図１に示した移動通信システムで移動機１５０とルーティング装置１１０の間の通信を中継する無線基地局を切り替えるときのルーティング装置１１０、第１の無線基地局１３０、第２の無線基地局１４０及び移動機１５０の処理手順を示すシーケンス図である。FIG. 3 shows the routing device 110, the first radio base station 130, and the second radio base when the radio base station that relays communication between the mobile device 150 and the routing device 110 is switched in the mobile communication system shown in FIG. FIG. 6 is a sequence diagram showing processing procedures of a station 140 and a mobile device 150. 図４は本発明の移動通信システムの実施例の構成を示すブロック図である。FIG. 4 is a block diagram showing the configuration of an embodiment of the mobile communication system of the present invention. 図５は図４に示した移動通信システムでＵＥ８による通信セッションを中継する無線基地局を切り替えるときのｅＮＢ１1、ＭＭＥ２、ＳＧＷ３1、ＮｏｄｅＢ５、ＲＮＣ６、ＳＧＳＮ７及びＵＥ８の処理手順を示すシーケンス図である。FIG. 5 is a sequence diagram showing processing procedures of eNB1 1 , MME2, SGW3 1 , NodeB5, RNC6, SGSN7 and UE8 when switching the radio base station that relays the communication session by UE8 in the mobile communication system shown in FIG. .
　本実施形態の移動通信システムを、図面を参照して詳細に説明する。図１は本実施形態の移動通信システムの構成を示すブロック図である。 The mobile communication system of the present embodiment will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the mobile communication system of the present embodiment.
　図１に示すように、本実施形態の移動通信システム１００は、ルーティング装置１１０、第１の無線基地局１３０及び第２の無線基地局１４０を有する。ルーティング装置１１０には、第１の無線基地局１３０及び第２の無線基地局１４０が接続される。 As shown in FIG. 1, the mobile communication system 100 of this embodiment includes a routing device 110, a first radio base station 130, and a second radio base station 140. A first radio base station 130 and a second radio base station 140 are connected to the routing device 110.
　ルーティング装置１１０、第１の無線基地局１３０及び第２の無線基地局１４０は、例えば、論理回路等から構成されるＬＳＩ（Large　Scale　Integration）、またはＣＰＵ（Central　Processing　Unit）もしくはＤＳＰ（Digital　Signal　Processor）等の半導体集積回路を備えており、半導体集積回路は以下に説明する各種の機能を有している。ルーティング装置１１０、第１の無線基地局１３０及び第２の無線基地局１４０がＣＰＵやＤＳＰを備えている場合、ＣＰＵやＤＳＰは、不図示の記録媒体に記録されたプログラムにしたがって処理を実行することで、以下に記載する機能を実現する。 The routing device 110, the first radio base station 130, and the second radio base station 140 are, for example, an LSI (Large Scale Integration) composed of logic circuits or the like, or a CPU (Central Processing Unit) or a DSP (Digital Signal Processor). ) And the like, and the semiconductor integrated circuit has various functions described below. When the routing device 110, the first radio base station 130, and the second radio base station 140 are provided with a CPU and a DSP, the CPU and the DSP execute processing according to a program recorded on a recording medium (not shown). This realizes the functions described below.
　移動機１５０は、携帯電話やＰＨＳ（Personal　Handyphone　System）などのような携帯端末である。 The mobile device 150 is a mobile terminal such as a mobile phone or a PHS (Personal Handyphone System).
　第１の無線基地局１３０は、移動機１５０と無線通信が可能な無線基地局であり、移動機１５０とルーティング装置１１０の間の通信を中継する機能を有する。 The first radio base station 130 is a radio base station capable of radio communication with the mobile device 150 and has a function of relaying communication between the mobile device 150 and the routing device 110.
　第２の無線基地局１４０は、第１の無線基地局１３０よりデータ通信速度が低く、移動機１５０と無線通信が可能な無線基地局であり、移動機１５０とルーティング装置１１０の間の通信を中継する機能を有する。 The second radio base station 140 is a radio base station having a data communication speed lower than that of the first radio base station 130 and capable of radio communication with the mobile device 150, and performs communication between the mobile device 150 and the routing device 110. Has a relay function.
　ルーティング装置１１０は、第１の無線基地局１３０及び第２の無線基地局１４０と接続され、さらに、不図示の他の移動通信システムと接続される。ルーティング装置１１０は、第１の無線基地局１３０及び第２の無線基地局１４０と不図示の他の移動通信システムとの間で送受信されるデータをルーティングする機能を有する。また、ルーティング装置１１０は、第１の無線基地局１３０及び第２の無線基地局１４０の通信セッションを制御する機能を有する。 The routing device 110 is connected to the first radio base station 130 and the second radio base station 140, and further connected to another mobile communication system (not shown). The routing device 110 has a function of routing data transmitted and received between the first radio base station 130 and the second radio base station 140 and another mobile communication system (not shown). Further, the routing device 110 has a function of controlling a communication session between the first radio base station 130 and the second radio base station 140.
　本実施形態の移動通信システムにおいて、移動機１５０が第１の無線基地局１３０と無線通信する場合、移動機１５０は、第１の無線基地局１３０及びルーティング装置１１０を介して不図示の他の移動通信システムと接続される。一方、移動機１５０が第２の無線基地局１４０と無線通信する場合、移動機１５０は、第２の無線基地局１４０及びルーティング装置１１０を介して不図示の他の移動通信システムと接続される。いずれの場合でも、ルーティング装置１１０がアンカーポイントとなる。 In the mobile communication system of the present embodiment, when the mobile device 150 wirelessly communicates with the first radio base station 130, the mobile device 150 is connected to another device (not shown) via the first radio base station 130 and the routing device 110. Connected to the mobile communication system. On the other hand, when the mobile device 150 communicates with the second radio base station 140 by radio, the mobile device 150 is connected to another mobile communication system (not shown) via the second radio base station 140 and the routing device 110. . In any case, the routing device 110 becomes an anchor point.
　以下、本実施形態のルーティング装置１１０の動作について説明する。 Hereinafter, the operation of the routing device 110 of this embodiment will be described.
　第２の無線基地局１４０でも中継可能な低速なデータ通信を第１の無線基地局１３０が中継すると、第１の無線基地局１３０の無線リソースおよび有線リソース（以下では、これらのリソースを通信リソースと称する）が低速なデータ通信に割り当てられるため、ネットワーク全体の通信リソースの利用効率が悪くなる。 When the first radio base station 130 relays low-speed data communication that can be relayed also by the second radio base station 140, the radio resources and the wired resources of the first radio base station 130 (hereinafter, these resources are referred to as communication resources). Is assigned to low-speed data communication, the use efficiency of communication resources of the entire network is deteriorated.
　そこで、本実施形態のルーティング装置１１０は、移動機１５０と自装置の間の通信を第１の無線基地局１３０が中継しているとき、移動機１５０によって送受信されるデータのスループットに基づいて、移動機１５０と自装置の間の通信を第２の無線基地局１４０が中継すべきか否かを判定する。 Therefore, the routing device 110 according to the present embodiment is based on the throughput of data transmitted and received by the mobile device 150 when the first radio base station 130 relays communication between the mobile device 150 and its own device. It is determined whether or not the second radio base station 140 should relay communication between the mobile device 150 and its own device.
　図２は本実施形態のルーティング装置の構成を示すブロック図である。 FIG. 2 is a block diagram showing the configuration of the routing device of this embodiment.
　図２に示すように、本実施形態のルーティング装置１１０は、通信部１１１、判定部１１２及び制御部１１３を有する。 As illustrated in FIG. 2, the routing device 110 according to the present embodiment includes a communication unit 111, a determination unit 112, and a control unit 113.
　通信部１１１は、第１の無線基地局１３０及び第２の無線基地局１４０と接続され、さらに、不図示の他の移動通信システムと接続される。通信部１１１は、第１の無線基地局１３０、第２の無線基地局１４０または不図示の他の移動通信システムを介して送受信されるデータをルーティングする。通信部１１１は、移動機１５０と自装置の間の通信を第１の無線基地局１３０が中継しているとき、移動機１５０によって送受信されたデータのスループットを算出し、算出したスループットを示すスループット情報を判定部１１２に送信する。 The communication unit 111 is connected to the first radio base station 130 and the second radio base station 140, and further connected to another mobile communication system (not shown). The communication unit 111 routes data transmitted / received via the first radio base station 130, the second radio base station 140, or another mobile communication system (not shown). The communication unit 111 calculates the throughput of data transmitted / received by the mobile device 150 when the first radio base station 130 relays communication between the mobile device 150 and its own device, and indicates the calculated throughput. Information is transmitted to the determination unit 112.
　判定部１１２は、通信部１１１からスループット情報を受信すると、受信したスループット情報に基づいて、移動機１５０と自装置の間の通信を第２の無線基地局１４０が中継すべきか否かを判定する。 Upon receiving throughput information from the communication unit 111, the determination unit 112 determines whether the second radio base station 140 should relay communication between the mobile device 150 and the own device based on the received throughput information. .
　移動機１５０による通信セッションの例としては、他の移動機との間の音声通信、Ｗｅｂサーバへのアクセス、映像配信サーバからの映像データの受信等がある。各通信セッションはパケット通信により実現されるため、送受信されるデータのスループットは一定にはならないが、大量のデータが送受信される通信セッションではスループットの低い状態が長時間継続する可能性は低い。 Examples of communication sessions by the mobile device 150 include voice communication with other mobile devices, access to a Web server, reception of video data from a video distribution server, and the like. Since each communication session is realized by packet communication, the throughput of transmitted / received data is not constant. However, in a communication session in which a large amount of data is transmitted / received, there is a low possibility that a low throughput state will continue for a long time.
　そこで、判定部１１２は、予め定められた時間（例えば１分間）に通信部１１１から受信した全てのスループット情報に示されるスループットが予め定められた閾値以下である場合、移動機１５０と自装置の間の通信を第２の無線基地局１４０が中継すべきと判定する。判定部１１２は、移動機１５０と自装置の間の通信を第２の無線基地局１４０が中継すべきと判定すると、移動機１５０と自装置の間の通信を中継する無線基地局を切り替えるための切替要求を制御部１１３に送信する。切替要求には、移動機１５０のアドレス情報と、移動機１５０による全ての通信セッションを示すセッション情報が含まれる。 Therefore, when the throughput shown in all the throughput information received from the communication unit 111 during a predetermined time (for example, 1 minute) is equal to or less than a predetermined threshold, the determination unit 112 determines whether the mobile device 150 and the own device It is determined that the second radio base station 140 should relay the communication between them. When determining that the second radio base station 140 should relay the communication between the mobile device 150 and the own device, the determining unit 112 switches the radio base station that relays the communication between the mobile device 150 and the own device. Is sent to the control unit 113. The switching request includes address information of the mobile device 150 and session information indicating all communication sessions by the mobile device 150.
　制御部１１３は、判定部１１２から切替要求を受信すると、移動機１５０と自装置の間の通信を中継する無線基地局の切り替えを制御する。 When the control unit 113 receives a switching request from the determination unit 112, the control unit 113 controls switching of a radio base station that relays communication between the mobile device 150 and the own device.
　具体的には、制御部１１３は、まず、第１の無線基地局１３０に、移動機１５０と自装置の間の通信の中継を終了するための切断要求を送信する。切断要求には、移動機１５０のアドレス情報とセッション情報が含まれる。切断要求を受信した第１の無線基地局１３０は、移動機１５０とルーティング装置１１０の間の通信の中継を終了し、制御部１１３に切断応答を返信する。 Specifically, the control unit 113 first transmits a disconnection request for ending relay of communication between the mobile device 150 and its own device to the first radio base station 130. The disconnect request includes address information and session information of the mobile device 150. The first radio base station 130 that has received the disconnection request ends the relay of communication between the mobile device 150 and the routing device 110 and returns a disconnection response to the control unit 113.
　また、制御部１１３は、第２の無線基地局１４０に、移動機１５０と自装置の間の通信を中継するための接続要求を送信する。接続要求には、移動機１５０のアドレス情報とセッション情報が含まれる。接続要求を受信した第２の無線基地局１３０は、移動機１５０とルーティング装置１１０の間の通信の中継を実施し、制御部１１３に接続応答を返信する。 Further, the control unit 113 transmits a connection request for relaying communication between the mobile device 150 and the own device to the second radio base station 140. The connection request includes address information of the mobile device 150 and session information. The second radio base station 130 that has received the connection request relays communication between the mobile device 150 and the routing device 110 and returns a connection response to the control unit 113.
　以上の処理により、制御部１１３は、移動機１５０と自装置の間の通信を中継する無線基地局を第１の無線基地局１３０から第２の無線基地局１４０に切り替える。 Through the above processing, the control unit 113 switches the radio base station that relays communication between the mobile device 150 and its own device from the first radio base station 130 to the second radio base station 140.
　次に図１に示した移動通信システムで移動機１５０とルーティング装置１１０の間の通信を中継する無線基地局を切り替えるときのルーティング装置１１０、第１の無線基地局１３０、第２の無線基地局１４０及び移動機１５０の処理手順について説明する。 Next, the routing device 110, the first radio base station 130, and the second radio base station when the radio base station that relays communication between the mobile device 150 and the routing device 110 is switched in the mobile communication system shown in FIG. The processing procedure of 140 and the mobile device 150 will be described.
　図３は図１に示した移動通信システムで移動機１５０とルーティング装置１１０の間の通信を中継する無線基地局を切り替えるときのルーティング装置１１０、第１の無線基地局１３０、第２の無線基地局１４０及び移動機１５０の処理手順を示すシーケンス図である。 FIG. 3 shows the routing device 110, the first radio base station 130, and the second radio base when the radio base station that relays communication between the mobile device 150 and the routing device 110 is switched in the mobile communication system shown in FIG. FIG. 6 is a sequence diagram showing processing procedures of a station 140 and a mobile device 150.
　図３に示す処理手順において、まず、移動機１５０は、第１の無線基地局１３０及びルーティング装置１１０を介して不図示の他の移動通信システムと接続しているものとする（ステップＳ１）。 In the processing procedure shown in FIG. 3, first, the mobile device 150 is assumed to be connected to another mobile communication system (not shown) via the first radio base station 130 and the routing device 110 (step S1).
　ルーティング装置１１０の通信部１１１は、移動機１５０によって送受信されたデータのスループットを算出し（ステップＳ２）、算出したスループットを示すスループット情報を判定部１１２に送信する。 The communication unit 111 of the routing device 110 calculates the throughput of data transmitted and received by the mobile device 150 (step S2), and transmits throughput information indicating the calculated throughput to the determination unit 112.
　判定部１１２は、通信部１１１からスループット情報を受信すると、受信したスループット情報に基づいて、移動機１５０と自装置の間の通信を第２の無線基地局１４０が中継すべきか否かを判定する（ステップＳ３）。予め定められた時間に通信部１１１から受信した全てのスループット情報に示されるスループットが予め定められた閾値以下である場合、判定部１１２は、移動機１５０と自装置の間の通信を第２の無線基地局１４０が中継すべきと判定する。移動機１５０と自装置の間の通信を第２の無線基地局１４０が中継すべきと判定すると、判定部１１２は、移動機１５０のアドレス情報とセッション情報を含む切替要求を制御部１１３に送信する。 Upon receiving throughput information from the communication unit 111, the determination unit 112 determines whether the second radio base station 140 should relay communication between the mobile device 150 and the own device based on the received throughput information. (Step S3). When the throughput shown in all throughput information received from the communication unit 111 at a predetermined time is equal to or less than a predetermined threshold, the determination unit 112 performs communication between the mobile device 150 and its own device. It is determined that the radio base station 140 should relay. When determining that the second radio base station 140 should relay communication between the mobile device 150 and its own device, the determination unit 112 transmits a switching request including the address information and session information of the mobile device 150 to the control unit 113. To do.
　判定部１１２から切替要求を受信すると、制御部１１３は、移動機１５０のアドレス情報とセッション情報を含む切断要求を第１の無線基地局１３０に送信すると共に（ステップＳ４）、移動機１５０のアドレス情報とセッション情報を含む接続要求を第２の無線基地局１４０に送信する（ステップＳ５）。 When receiving the switching request from the determination unit 112, the control unit 113 transmits a disconnection request including the address information and session information of the mobile device 150 to the first radio base station 130 (step S4), and the address of the mobile device 150. A connection request including information and session information is transmitted to the second radio base station 140 (step S5).
　ルーティング装置１１０の制御部１１３から切断要求を受信すると、第１の無線基地局１３０は、移動機１５０とルーティング装置１１０の間の通信の中継を終了し、制御部１１３に切断応答を返信する（ステップＳ６）。 When receiving the disconnection request from the control unit 113 of the routing device 110, the first radio base station 130 ends the relay of communication between the mobile device 150 and the routing device 110, and returns a disconnection response to the control unit 113 ( Step S6).
　また、ルーティング装置１１０の制御部１１３から接続要求を受信すると、第２の無線基地局１４０は、移動機１５０とルーティング装置１１０の間の通信の中継を実施し、制御部１１３に接続応答を返信する（ステップＳ７）。 When receiving the connection request from the control unit 113 of the routing device 110, the second radio base station 140 relays communication between the mobile device 150 and the routing device 110 and returns a connection response to the control unit 113. (Step S7).
　その後、移動機１５０は、第２の無線基地局１４０及びルーティング装置１１０を介して不図示の他の移動通信システムと接続する（ステップＳ８）。 Thereafter, the mobile device 150 is connected to another mobile communication system (not shown) via the second radio base station 140 and the routing device 110 (step S8).
　移動機１５０とルーティング装置１１０の間の通信の中継を終了すると、第１の無線基地局１３０は、移動機１５０の通信セッションで用いられていた通信リソースを解放する（ステップＳ９）。 When the relay of communication between the mobile device 150 and the routing device 110 is completed, the first radio base station 130 releases communication resources used in the communication session of the mobile device 150 (step S9).
　なお、本実施形態では、ルーティング装置１１０が、移動機１５０と自装置の間の通信を中継する無線基地局の切り替えの要求を第１の無線基地局１３０及び第２の無線基地局１４０に送信する例を示したが、本発明はこれに限定されるものではない。例えば、ルーティング装置１１０は、移動機１５０と自装置の間の通信を中継する無線基地局の切り替えの要求を移動機１５０に送信することにしてもよい。その場合、ルーティング装置１１０は、第１の無線基地局１３０を介して移動機１５０に、無線通信する無線基地局を第２の無線基地局１４０に切り替えるための要求を送信する。その要求を受信した移動機１５０は、自身が無線通信する無線基地局を第１の無線基地局１３０から第２の無線基地局１４０に切り替える。 In the present embodiment, the routing device 110 transmits a request to switch the radio base station that relays communication between the mobile device 150 and the own device to the first radio base station 130 and the second radio base station 140. However, the present invention is not limited to this example. For example, the routing device 110 may transmit a request for switching a radio base station that relays communication between the mobile device 150 and the mobile device 150 to the mobile device 150. In that case, the routing apparatus 110 transmits a request for switching the radio base station that performs radio communication to the second radio base station 140 to the mobile device 150 via the first radio base station 130. The mobile device 150 that has received the request switches the radio base station with which the mobile device 150 performs radio communication from the first radio base station 130 to the second radio base station 140.
　また、本実施形態では、ルーティング装置１１０は、移動機１５０によって送受信されたデータのスループットが、予め定められた時間、予め定められた閾値以下である場合に、移動機１５０と自装置の間の通信を第２の無線基地局１４０が中継すべきと判定する例を示した。しかしながら、本発明はこれに限定されるものではない。例えば、ルーティング装置１１０は、移動機１５０によって送受信されるデータのスループットの予め定められた時間の平均値が予め定められた閾値以下である場合に、移動機１５０と自装置の間の通信を第２の無線基地局１４０が中継すべきと判定することにしてもよい。 Further, in the present embodiment, the routing device 110, when the throughput of data transmitted / received by the mobile device 150 is equal to or less than a predetermined threshold for a predetermined time, between the mobile device 150 and its own device. In the example, the second radio base station 140 determines that the communication should be relayed. However, the present invention is not limited to this. For example, the routing device 110 performs communication between the mobile device 150 and its own device when the average value of the predetermined time of the throughput of data transmitted and received by the mobile device 150 is equal to or less than a predetermined threshold. It may be determined that the second radio base station 140 should relay.
　以上説明したように、本実施形態によれば、ルーティング装置は、移動機と自装置の間の通信をデータ通信速度の高い無線基地局が中継しているとき、その移動機によって送受信されたデータのスループットを算出する。予め定められた時間内で算出されたスループットが予め定められた閾値以下である場合、ルーティング装置は、その移動機と自装置の間の通信をデータ通信速度の低い無線基地局で中継すべきと判定し、無線基地局の切り替えを制御する。 As described above, according to the present embodiment, when a wireless base station with a high data communication speed relays communication between a mobile device and its own device, the routing device transmits / receives data transmitted / received by the mobile device. To calculate the throughput. When the throughput calculated within a predetermined time is equal to or less than a predetermined threshold, the routing device should relay communication between the mobile device and the own device with a radio base station having a low data communication speed. Determine and control the switching of radio base stations.
　ルーティング装置は、移動機によって送受信されるデータのスループットに基づいて、その移動機と自装置の間の通信を中継すべき無線基地局を適切に選択できる。これにより、移動通信システムは、低速なデータ通信を通信速度の低い無線基地局に割り当て、高速なデータ通信を通信速度の高い無線基地局に割り当てることができ、ネットワーク内の通信リソースを効率よく利用できる。 The routing device can appropriately select a radio base station that should relay communication between the mobile device and its own device based on the throughput of data transmitted and received by the mobile device. As a result, the mobile communication system can allocate low-speed data communication to a radio base station with a low communication speed, and can allocate high-speed data communication to a radio base station with a high communication speed, thereby efficiently using communication resources in the network. it can.
　（実施例）
　次に本発明の実施例について図面を用いて説明する。本実施例は、３．９Ｇネットワークと３Ｇネットワークが共存するエリアに移動通信システムを適用する例である。 (Example)
Next, embodiments of the present invention will be described with reference to the drawings. This embodiment is an example in which a mobile communication system is applied to an area where a 3.9G network and a 3G network coexist.
　図４は本発明の移動通信システムの実施例の構成を示すブロック図である。 FIG. 4 is a block diagram showing the configuration of an embodiment of the mobile communication system of the present invention.
　図４に示すように、本実施例の移動通信システムは、ＵＥ（User　Equipment）８と、３．９Ｇネットワークの無線アクセスネットワークであるＬＴＥ（Long　Term　Evolution）ネットワーク１０と、３．９Ｇネットワークのコアネットワークであり、ＬＴＥネットワーク１０の上位ネットワークとなるＥＰＣ（Evolved　Packet　Core）１１と、３Ｇネットワークを形成するＷ－ＣＤＭＡネットワーク１２を有する。ＥＰＣ１１はＬＴＥネットワーク１０と接続され、３．９Ｇネットワークが形成される。また、ＥＰＣ１１はＷ－ＣＤＭＡネットワーク１２とも接続される。 As shown in FIG. 4, the mobile communication system of the present embodiment includes a UE (User Equipment) 8, an LTE (Long Term Evolution) network 10 which is a radio access network of the 3.9G network, and a core of the 3.9G network. The network includes an EPC (Evolved Packet Core) 11 that is an upper network of the LTE network 10 and a W-CDMA network 12 that forms a 3G network. The EPC 11 is connected to the LTE network 10 to form a 3.9G network. The EPC 11 is also connected to the W-CDMA network 12.
　Ｗ－ＣＤＭＡネットワーク１２は、ＮｏｄｅＢ５、ＲＮＣ（Radio　Network　Controller）６及びＳＧＳＮ（Serving　General　packet　radio　service　Support　Node）７を有する。ＬＴＥネットワーク１０は、複数のｅＮＢ（evolved　Node　B）１1，１2を有する。ＥＰＣ１１は、ＭＭＥ（Mobility　Management　Entity）２、複数のＳＧＷ（Serving　Gateway）３1，３2及びＰＧＷ（Packet　Data　Network　Gateway）４を有する。 The W-CDMA network 12 includes a NodeB 5, an RNC (Radio Network Controller) 6, and an SGSN (Serving General packet radio service Support Node) 7. The LTE network 10 includes a plurality of eNBs (evolved Node B) 1 1 and 1 2 . The EPC 11 includes an MME (Mobility Management Entity) 2, a plurality of SGWs (Serving Gateways) 3 1 and 3 2, and a PGW (Packet Data Network Gateway) 4.
　ｅＮＢ１1、ｅＮＢ１2、ＭＭＥ２、ＳＧＷ３1、ＳＧＷ３2、ＰＧＷ４、ＮｏｄｅＢ５、ＲＮＣ６及びＳＧＳＮ７は、例えば、論理回路等から構成されるＬＳＩ、またはＣＰＵもしくはＤＳＰ等の半導体集積回路を備え、半導体集積回路は以下に説明する各種の機能を有している。ｅＮＢ１1、ｅＮＢ１2、ＭＭＥ２、ＳＧＷ３1、ＳＧＷ３2、ＰＧＷ４、ＮｏｄｅＢ５、ＲＮＣ６及びＳＧＳＮ７がＣＰＵやＤＳＰを備えている場合、ＣＰＵやＤＳＰは、不図示の記録媒体に記録されたプログラムにしたがって処理を実行することで、以下に記載する機能を実現する。 eNB1 1 , eNB1 2 , MME2, SGW3 1 , SGW3 2 , PGW4, NodeB5, RNC6 and SGSN7 include, for example, an LSI composed of a logic circuit or the like, or a semiconductor integrated circuit such as a CPU or DSP, It has various functions described below. When the eNB 1 1 , eNB 1 2 , MME 2 , SGW 3 1 , SGW 3 2 , PGW 4, Node B 5, RNC 6, and SGSN 7 are equipped with a CPU or DSP, the CPU or DSP performs processing according to a program recorded on a recording medium (not shown). By executing this function, the following functions are realized.
　ＵＥ８は、携帯電話やＰＨＳなどのような携帯端末である。 UE8 is a mobile terminal such as a mobile phone or PHS.
　ｅＮＢ１1、ｅＮＢ１2は、それぞれ、ＥＰＣ１１のＭＭＥ２及びＳＧＷ３1、ＳＧＷ３2と接続される。ｅＮＢ１1、ｅＮＢ１2は、ＵＥ８と無線通信が可能な、ＬＴＥ方式の発展的無線基地局であり、ＵＥ８による通信セッションで用いられる通信リソースを管理する機能と、ＵＥ８のモビリティ管理機能を有する。 eNB1 1 and eNB1 2 are connected to MME2 and SGW3 1 and SGW3 2 of EPC11, respectively. eNB1 1 and eNB1 2 are LTE advanced radio base stations capable of radio communication with UE8, and have a function of managing communication resources used in a communication session by UE8 and a mobility management function of UE8.
　ＭＭＥ２は、ＳＧＷ３1、ＳＧＷ３2と接続され、Ｗ－ＣＤＭＡネットワーク１２のＳＧＳＮ７と接続され、ＬＴＥネットワーク１０のｅＮＢ１1、ｅＮＢ１2と接続される。ＭＭＥ２は、ｅＮＢ１1、ｅＮＢ１2の通信セッションを制御する機能を有する。 The MME 2 is connected to the SGW 3 1 and SGW 3 2 , connected to the SGSN 7 of the W-CDMA network 12, and connected to the eNB 1 1 and eNB 1 2 of the LTE network 10. The MME 2 has a function of controlling communication sessions of the eNB 1 1 and the eNB 1 2 .
　ＳＧＷ３1、ＳＧＷ３2は、ＰＧＷ４と接続され、Ｗ－ＣＤＭＡネットワーク１２のＳＧＳＮ７と接続され、ＬＴＥネットワーク１０のｅＮＢ１1、ｅＮＢ１2と接続される。ＳＧＷ３1、ＳＧＷ３2は、ＳＧＳＮ７が送受信するデータとｅＮＢ１1、ｅＮＢ１2が送受信するデータをルーティングする機能を有する。 SGW 3 1 and SGW 3 2 are connected to PGW 4, connected to SGSN 7 of W-CDMA network 12, and connected to eNB 1 1 and eNB 1 2 of LTE network 10. The SGW 3 1 and SGW 3 2 have a function of routing data transmitted and received by the SGSN 7 and data transmitted and received by the eNB 1 1 and eNB 1 2 .
　ＰＧＷ４は、不図示のＩＳＰ（Internet　Services　Provider）や企業ＬＡＮ（Local　Area　Network）と接続され、さらにＳＧＷ３1、ＳＧＷ３2と接続される。ＰＧＷ４は、ＩＳＰや企業ＬＡＮと、ＳＧＷ３1、ＳＧＷ３2との間で送受信されるデータを中継する。 The PGW 4 is connected to an ISP (Internet Services Provider) or a corporate LAN (Local Area Network) (not shown), and further connected to the SGW 3 1 and the SGW 3 2 . The PGW 4 relays data transmitted / received between the ISP or the corporate LAN and the SGW 3 1 and SGW 3 2 .
　ＮｏｄｅＢ５は、ＲＮＣ６と接続される。ＮｏｄｅＢ５は、ＵＥ８と無線通信が可能な、Ｗ－ＣＤＭＡ方式の無線基地局である。 Node B5 is connected to RNC6. Node B 5 is a W-CDMA wireless base station capable of wireless communication with UE 8.
　ＲＮＣ６は、ＮｏｄｅＢ５と接続され、さらにＳＧＳＮ７と接続される。ＲＮＣ６は、ＮｏｄｅＢ５の無線リソースを管理する機能を有する。 RNC 6 is connected to Node B 5 and further connected to SGSN 7. The RNC 6 has a function of managing the radio resources of the NodeB 5.
　ＳＧＳＮ７は、ＲＮＣ６と接続され、さらにＥＰＣ１１のＳＧＷ３1、ＳＧＷ３2と接続される。ＳＧＳＮ７は、ＵＥ８がＮｏｄｅＢ５及びＲＮＣ６を介して送受信するデータをルーティングする機能を有する。 SGSN 7 is connected to RNC 6 and further connected to SGW 3 1 and SGW 3 2 of EPC 11 . The SGSN 7 has a function of routing data transmitted and received by the UE 8 via the NodeB 5 and the RNC 6.
　本実施例のＳＧＷ３1、ＳＧＷ３2はルーティング装置１１０の通信部１１１及び判定部１１２の機能を有し、ＭＭＥ２はルーティング装置１１０の制御部１１３の機能を有する。また、ｅＮＢ１1、ｅＮＢ１2は第１の無線基地局１３０に対応し、ＮｏｄｅＢ５は第２の無線基地局１４０に対応し、ＵＥ８は移動機１５０に対応する。 The SGW 3 1 and SGW 3 2 of this embodiment have the functions of the communication unit 111 and the determination unit 112 of the routing device 110, and the MME 2 has the function of the control unit 113 of the routing device 110. ENB1 1 and eNB1 2 correspond to the first radio base station 130, NodeB 5 corresponds to the second radio base station 140, and UE 8 corresponds to the mobile device 150.
　なお、ｅＮＢ１1、ｅＮＢ１2、ＳＧＷ３1、ＳＧＷ３2の数については、図４に示した数に限らない。また、ＮｏｄｅＢ５、ＲＮＣ６の数は１つに限らず、複数であってもよい。 Note that the numbers of eNB1 1 , eNB1 2 , SGW3 1 , SGW3 2 are not limited to the numbers shown in FIG. Moreover, the number of NodeB5 and RNC6 is not restricted to one, and may be plural.
　本実施例の移動通信システムにおいて、ＵＥ８がＬＴＥネットワーク１０のｅＮＢ１1と無線通信する場合、ＵＥ８は、ｅＮＢ１1、ＳＧＷ３1（あるいはＳＧＷ３2）及びＰＧＷ４を介して不図示のＩＳＰや企業ＬＡＮと接続される。一方、ＵＥ８がＷ－ＣＤＭＡネットワーク１２のＮｏｄｅＢ５と無線通信する場合、ＵＥ８は、ＮｏｄｅＢ５、ＲＮＣ６、ＳＧＳＮ７、ＳＧＷ３1（あるいはＳＧＷ３2）及びＰＧＷ４を介して不図示のＩＳＰや企業ＬＡＮと接続される。いずれの場合でも、ＳＧＷ３1（あるいはＳＧＷ３2）がアンカーポイントとなる。 In the mobile communication system of the present embodiment, when the UE 8 wirelessly communicates with the eNB 1 1 of the LTE network 10, the UE 8 is connected to an ISP or a corporate LAN (not shown) via the eNB 1 1 , SGW 3 1 (or SGW 3 2 ), and PGW 4. Is done. On the other hand, when the UE 8 performs radio communication with the Node B 5 of the W-CDMA network 12, the UE 8 is connected to an ISP or a corporate LAN (not shown) via the Node B 5, the RNC 6, the SGSN 7, the SGW 3 1 (or SGW 3 2 ), and the PGW 4. In either case, SGW3 1 (or SGW3 2 ) is an anchor point.
　ＳＧＷ３1、ＳＧＷ３2は、ＵＥ８と自装置の間の通信をｅＮＢ１1またはｅＮＢ１2が中継しているとき、ＵＥ８によって送受信されたデータのスループットを算出する。ＳＧＷ３1、ＳＧＷ３2は、予め定められた時間内で算出されたスループットが予め定められた閾値以下である場合、ＵＥ８と自装置の間の通信をＮｏｄｅＢ５が中継すべきと判定する。ＳＧＷ３1、ＳＧＷ３2は、ＵＥ８と自装置の間の通信をＮｏｄｅＢ５が中継すべきと判定すると、ＵＥ８と自装置の間の通信を中継する無線基地局を切り替えるための切替要求をＭＭＥ２に送信する。 The SGW 3 1 and the SGW 3 2 calculate the throughput of data transmitted and received by the UE 8 when the eNB 1 1 or the eNB 1 2 relays communication between the UE 8 and the own device. The SGW 3 1 and the SGW 3 2 determine that the Node B 5 should relay the communication between the UE 8 and the own device when the throughput calculated within the predetermined time is equal to or less than the predetermined threshold. When the SGW 3 1 and the SGW 3 2 determine that the NodeB 5 should relay the communication between the UE 8 and the own device, the SGW 3 1 and the SGW 3 2 transmit a switching request for switching the radio base station that relays the communication between the UE 8 and the own device to the MME 2. .
　ＭＭＥ２は、ＳＧＷ３1またはＳＧＷ３2から切替要求を受信すると、ＵＥ８と自装置の間の通信を中継する無線基地局の切り替えを制御する。 When the MME 2 receives the switching request from the SGW 3 1 or the SGW 3 2, the MME 2 controls switching of the radio base station that relays the communication between the UE 8 and the own device.
　次に図４に示した移動通信システムでＵＥ８による通信セッションを中継する無線基地局を切り替えるときのｅＮＢ１1、ＭＭＥ２、ＳＧＷ３1、ＮｏｄｅＢ５、ＲＮＣ６、ＳＧＳＮ７及びＵＥ８の処理手順について説明する。 Next, processing procedures of the eNB 1 1 , MME 2, SGW 3 1 , Node B 5, RNC 6, SGSN 7 and UE 8 when switching the radio base station that relays the communication session by the UE 8 in the mobile communication system shown in FIG. 4 will be described.
　図５は図４に示した移動通信システムでＵＥ８による通信セッションを中継する無線基地局を切り替えるときのｅＮＢ１1、ＭＭＥ２、ＳＧＷ３1、ＮｏｄｅＢ５、ＲＮＣ６、ＳＧＳＮ７及びＵＥ８の処理手順を示すシーケンス図である。 FIG. 5 is a sequence diagram showing processing procedures of eNB1 1 , MME2, SGW3 1 , NodeB5, RNC6, SGSN7 and UE8 when switching the radio base station that relays the communication session by UE8 in the mobile communication system shown in FIG. .
　図５に示す処理手順において、まず、ＵＥ８は、ｅＮＢ１1、ＳＧＷ３1及びＰＧＷ４を介して、不図示のＩＳＰや企業ＬＡＮと接続しているものとする（ステップＳ２１）。図中の実線は、ユーザデータの流れを示し、点線は、制御信号の流れを示す。ユーザデータは、ｅＮＢ１1及びＳＧＷ３1を介して送受信され、制御信号は、ｅＮＢ１1、ＭＭＥ２及びＳＧＷ３1を介して送受信される。 In the processing procedure shown in FIG. 5, first, the UE 8 is assumed to be connected to an ISP or a corporate LAN (not shown) via the eNB 1 1 , the SGW 3 1, and the PGW 4 (Step S 21). The solid line in the figure indicates the flow of user data, and the dotted line indicates the flow of control signals. User data is transmitted / received via eNB1 1 and SGW3 1 , and control signals are transmitted / received via eNB1 1 , MME2 and SGW3 1 .
　ＳＧＷ３1は、ＵＥ８によって送受信されたデータのスループットを算出する（ステップＳ２２）。 The SGW 3 1 calculates the throughput of data transmitted and received by the UE 8 (step S22).
　ＳＧＷ３1は、算出したスループットに基づいて、ＵＥ８と自装置の間の通信をＮｏｄｅＢ５が中継すべきか否かを判定する（ステップＳ２３）。予め定められた時間内で算出されたスループットが予め定められた閾値以下である場合、ＳＧＷ３1は、ＵＥ８と自装置の間の通信をＮｏｄｅＢ５が中継すべきと判定する。ＵＥ８と自装置の間の通信をＮｏｄｅＢ５が中継すべきと判定すると、ＳＧＷ３1は、ＵＥ８のアドレス情報とセッション情報を含む切替要求をＭＭＥ２に送信する（ステップＳ２４）。 The SGW 3 1 determines whether or not the Node B 5 should relay the communication between the UE 8 and the own device based on the calculated throughput (step S23). If predetermined throughput calculated in the time is not greater than the predetermined threshold value, determines that SGW3 1 is to be relayed is NodeB5 communication between the own apparatus and UE8. If it is determined that the NodeB 5 should relay the communication between the UE 8 and the own device, the SGW 31 transmits a switching request including the address information and session information of the UE 8 to the MME 2 (step S24).
　ＳＧＷ３1から切替要求を受信すると、ＭＭＥ２は、ＵＥ８による全ての通信セッションを中継する基地局を切り替えるためのセッション切替要求をｅＮＢ１1に送信する（ステップＳ２４）。セッション切替要求には、ＵＥ８のアドレス情報とセッション情報が含まれる。 When receiving the switching request from the SGW 3 1 , the MME 2 transmits to the eNB 1 1 a session switching request for switching the base station that relays all communication sessions by the UE 8 (step S 24). The session switching request includes the address information and session information of UE8.
　ＭＭＥ２からセッション切替要求を受信すると、ｅＮＢ１1は、ＵＥ８の全ての通信セッションを解放できるか否かを判定する。ｅＮＢ１1は、ＵＥ８の全ての通信セッションを解放できる場合、セッション切替応答をＭＭＥ２に返信する（ステップＳ２５）。 When receiving the session switching request from the MME 2, the eNB 1 1 determines whether or not all communication sessions of the UE 8 can be released. eNB1 1, when it releases all of the communication session UE8, returns a session switching response to the MME2 (step S25).
　ｅＮＢ１1からセッション切替応答を受信すると、ＭＭＥ２は、３ＧＰＰで規定されるＩｎｔｅｒ－ＲＡＴ　Ｒｅｌｏｃａｔｉｏｎ処理を実行する（ステップＳ２６）。Ｉｎｔｅｒ－ＲＡＴ　Ｒｅｌｏｃａｔｉｏｎ処理により、ＭＭＥ２は、ＵＥ８と自装置の間の通信を中継する無線基地局をｅＮＢ１1からＮｏｄｅＢ５に切り替える。これにより、ＵＥ８の全ての通信セッションは、Ｗ－ＣＤＭＡネットワーク１２内に確立され、ＬＴＥネットワーク１０から解放される。 Upon receiving a session switching response from eNB1 1, MME2 executes Inter-RAT Relocation process defined by 3GPP (step S26). Through the Inter-RAT Relocation process, the MME 2 switches the radio base station that relays communication between the UE 8 and the own apparatus from the eNB 11 to the Node B 5. Thereby, all communication sessions of the UE 8 are established in the W-CDMA network 12 and released from the LTE network 10.
　なお、このとき、ＳＧＷ３1がＵＥ８の通信セッションのアンカーポイントとなる。また、Ｉｎｔｅｒ－ＲＡＴ　Ｒｅｌｏｃａｔｉｏｎ処理は、非特許文献１の「５．５．２．１　Ｅ－ＵＴＲＡＮ　ｔｏ　ＵＴＲＡＮ　Ｉｕ　ｍｏｄｅ　Ｉｎｔｅｒ　ＲＡＴ　ｈａｎｄｏｖｅｒ」に示される、ＭＭＥがｅＮｏｄｅＢから「ＨａｎｄｏｖｅｒＲｅｑｕｉｒｅｄ」メッセージを受信した後の処理に該当するものであり、ここでは詳細な説明は省略する。 At this time, SGW3 1 becomes an anchor point of the communication session of UE8. Also, the Inter-RAT Relocation processing is performed after the MME receives the “Handover Required” message from the eNodeB, as shown in “5.5.2.1 E-UTRAN to UTRAN Iu mode Inter RAT handover” in Non-Patent Document 1. This corresponds to processing, and detailed description thereof is omitted here.
　その後、ＵＥ８は、ＮｏｄｅＢ５、ＲＮＣ６、ＳＧＳＮ７、ＳＧＷ３1及びＰＧＷ４を介して、不図示のＩＳＰや企業ＬＡＮと接続する。 Thereafter, UE8 is, NodeB5, RNC6, SGSN7, SGW3 through one and PGW4, connected to the ISP or corporate LAN (not shown).
　以上説明したように、本実施例によれば、３．９Ｇネットワークと３Ｇネットワークが共存するエリアに移動通信システムを適用することができる。これにより、移動通信システムは、低速なデータ通信をＷ－ＣＤＭＡ方式の無線基地局に割り当て、高速なデータ通信をＬＴＥ方式の無線基地局に割り当てることができ、ネットワーク内の通信リソースを効率よく利用できる。 As described above, according to the present embodiment, the mobile communication system can be applied to an area where the 3.9G network and the 3G network coexist. As a result, the mobile communication system can allocate low-speed data communication to the W-CDMA radio base station, and can allocate high-speed data communication to the LTE radio base station, thereby efficiently using communication resources in the network. it can.
　本発明の効果の一例として、通信速度の異なる複数の無線基地局を有する移動通信システムにおいて、ネットワーク内の通信リソースを効率よく利用できる。 As an example of the effect of the present invention, in a mobile communication system having a plurality of radio base stations with different communication speeds, communication resources in the network can be used efficiently.
　以上、実施形態を参照して本願発明を説明したが、本願発明は上記実施形態に限定されるものではない。本願発明の構成や詳細には、本願発明のスコープ内で当業者が理解し得る様々な変更をすることができる。 The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.
　なお、この出願は、２０１０年１月２０日に出願された日本出願の特願２０１０－００９９２５の内容が全て取り込まれており、この日本出願を基礎として優先権を主張するものである。 Note that this application incorporates all the contents of Japanese Patent Application No. 2010-009925 filed on January 20, 2010, and claims priority based on this Japanese application.
　１1、１2　　ｅＮＢ
　２　　ＭＭＥ
　３1、３2　　ＳＧＷ
　４　　ＰＧＷ
　５　　ＮｏｄｅＢ
　６　　ＲＮＣ
　７　　ＳＧＳＮ
　８　　ＵＥ
　１０　　ＬＴＥネットワーク
　１１　　ＥＰＣ
　１２　　Ｗ－ＣＤＭＡネットワーク
　１００　　移動通信システム
　１１０　　ルーティング装置
　１１１　　通信部
　１１２　　判定部
　１１３　　制御部
　１３０　　第１の無線基地局
　１４０　　第２の無線基地局
　１５０　　移動機 1 1 , 1 2 eNB
2 MME
3 1 , 3 2 SGW
4 PGW
5 NodeB
6 RNC
7 SGSN
8 UE
10 LTE network 11 EPC
12 W-CDMA network 100 Mobile communication system 110 Routing device 111 Communication unit 112 Determination unit 113 Control unit 130 First radio base station 140 Second radio base station 150 Mobile device

Claims (6)

  1. 　複数の無線基地局を有する移動通信システムであって、
    　移動機と無線通信が可能な第１の無線基地局と、
    　該第１の無線基地局よりデータ通信速度が低く、前記移動機と無線通信が可能な第２の無線基地局と、
    　前記第１の無線基地局及び前記第２の無線基地局と接続されるルーティング装置と、を有し、
    　前記ルーティング装置は、前記移動機と自装置の間の通信を前記第１の無線基地局が中継しているとき、該移動機が該第１の無線基地局を介して送受信するデータをルーティングすると共に、該ルーティングしたデータのスループットを算出し、予め定められた時間内で算出された前記スループットが予め定められた閾値以下である場合、前記移動機と自装置の間の通信を前記第２の無線基地局が中継すべきと判定し、前記移動機と自装置の間の通信の中継を終了するための切断要求を前記第１の無線基地局に送信すると共に、前記移動機と自装置の間の通信を中継するための接続要求を前記第２の無線基地局に送信し、
    　前記第１の無線基地局は、前記移動機と前記ルーティング装置の間の通信を中継しているとき、前記切断要求を受信すると、該中継を終了し、
    　前記第２の無線基地局は、前記接続要求を受信すると、前記移動機と前記ルーティング装置の間の通信を中継する移動通信システム。     A mobile communication system having a plurality of radio base stations,
    A first radio base station capable of radio communication with a mobile device;
    A second radio base station having a data communication speed lower than that of the first radio base station and capable of radio communication with the mobile device;
    A routing device connected to the first radio base station and the second radio base station,
    The routing device routes data transmitted and received by the mobile device via the first radio base station when the first radio base station relays communication between the mobile device and the mobile device. In addition, when the throughput of the routed data is calculated and the throughput calculated within a predetermined time is equal to or less than a predetermined threshold, communication between the mobile device and the own device is performed in the second The radio base station determines that relaying should be performed, and transmits a disconnection request for ending relay of communication between the mobile device and the own device to the first radio base station, and between the mobile device and the own device. A connection request for relaying communication between the second radio base stations,
    When the first radio base station relays communication between the mobile device and the routing device, upon receiving the disconnection request, the first radio base station ends the relay,
    When the second radio base station receives the connection request, the second radio base station relays communication between the mobile device and the routing device.
  2. 　請求項１に記載の移動通信システムにおいて、
    　前記第１の無線基地局は、ＬＴＥ（Ｌｏｎｇ　Ｔｅｒｍ　Ｅｖｏｌｕｔｉｏｎ）方式の無線基地局であり、
    　前記第２の無線基地局は、Ｗ－ＣＤＭＡ（Ｗｉｄｅｂａｎｄ　Ｃｏｄｅ　Ｄｉｖｉｓｉｏｎ　Ｍｕｌｔｉｐｌｅ　Ａｃｃｅｓｓ）方式の無線基地局である、移動通信システム。     The mobile communication system according to claim 1, wherein
    The first radio base station is an LTE (Long Term Evolution) radio base station,
    The mobile communication system, wherein the second radio base station is a radio base station of W-CDMA (Wideband Code Multiple Access) system.
  3. 　複数の無線基地局と接続されるルーティング装置であって、
    　移動機と無線通信が可能な第１の無線基地局と接続されると共に、該第１の無線基地局よりデータ通信速度が低く、前記移動機と無線通信が可能な第２の無線基地局と接続され、前記移動機と自装置の間の通信を前記第１の無線基地局が中継しているとき、該第１の無線基地局を介して該移動機が送受信するデータをルーティングすると共に、該ルーティングしたデータのスループットを算出する通信手段と、
    　予め定められた時間内で算出された前記スループットが予め定められた閾値以下であるか否かに基づいて、前記移動機と自装置の間の通信を前記第２の無線基地局が中継すべきか否かを判定する判定手段と、
    　前記判定手段によって、前記移動機と自装置の間の通信を前記第２の無線基地局が中継すべきと判定された場合、前記移動機と自装置の間の通信を中継する無線基地局を前記第１の無線基地局から前記第２の無線基地局へ切り替えるように制御する制御手段と、を有するルーティング装置。     A routing device connected to a plurality of radio base stations,
    A second radio base station connected to a first radio base station capable of radio communication with a mobile device, having a data communication speed lower than that of the first radio base station, and capable of radio communication with the mobile device; When the first radio base station is connected and the first radio base station relays communication between the mobile device and its own device, the mobile device routes data transmitted and received via the first radio base station, and Communication means for calculating the throughput of the routed data;
    Whether the second radio base station should relay communication between the mobile device and its own device based on whether or not the throughput calculated within a predetermined time is equal to or less than a predetermined threshold Determining means for determining whether or not;
    When it is determined by the determination means that the second radio base station should relay communication between the mobile device and the device, a radio base station that relays communication between the mobile device and the device Control means for controlling to switch from the first radio base station to the second radio base station.
  4. 　移動機と無線通信が可能な第１の無線基地局と、該第１の無線基地局よりデータ通信速度が低く、前記移動機と無線通信が可能な第２の無線基地局と、前記第１の無線基地局及び前記第２の無線基地局と接続されるルーティング装置と、を有する移動通信システムの通信制御方法であって、
    　前記ルーティング装置が、前記移動機と自装置の間の通信を前記第１の無線基地局が中継しているとき、該第１の無線基地局を介して該移動機が送受信するデータをルーティングすると共に、該ルーティングしたデータのスループットを算出し、予め定められた時間内で算出された前記スループットが予め定められた閾値以下である場合、前記移動機と自装置の間の通信を前記第２の無線基地局が中継すべきと判定し、前記移動機と自装置の間の通信の中継を終了するための切断要求を前記第１の無線基地局に送信すると共に、前記移動機と自装置の間の通信を中継するための接続要求を前記第２の無線基地局に送信し、
    　前記第１の無線基地局が、前記移動機と前記ルーティング装置の間の通信を中継しているとき、前記切断要求を受信すると、該中継を終了し、
    　前記第２の無線基地局が、前記接続要求を受信すると、前記移動機と前記ルーティング装置の間の通信を中継する通信制御方法。     A first wireless base station capable of wireless communication with a mobile device, a second wireless base station capable of wireless communication with the mobile device, the data communication speed being lower than that of the first wireless base station, and the first wireless base station. And a routing device connected to the second radio base station, and a communication control method for a mobile communication system comprising:
    When the first radio base station relays communication between the mobile device and the mobile device, the routing device routes data transmitted and received by the mobile device via the first radio base station. In addition, when the throughput of the routed data is calculated and the throughput calculated within a predetermined time is equal to or less than a predetermined threshold, communication between the mobile device and the own device is performed in the second The radio base station determines that relaying should be performed, and transmits a disconnection request for ending relay of communication between the mobile device and the own device to the first radio base station, and between the mobile device and the own device. A connection request for relaying communication between the second radio base stations,
    When the first radio base station is relaying communication between the mobile device and the routing device, upon receiving the disconnection request, the relay is terminated.
    A communication control method for relaying communication between the mobile device and the routing device when the second radio base station receives the connection request.
  5. 　請求項４に記載の通信制御方法において、
    　前記第１の無線基地局は、ＬＴＥ（Ｌｏｎｇ　Ｔｅｒｍ　Ｅｖｏｌｕｔｉｏｎ）方式の無線基地局であり、
    　前記第２の無線基地局は、Ｗ－ＣＤＭＡ（Ｗｉｄｅｂａｎｄ　Ｃｏｄｅ　Ｄｉｖｉｓｉｏｎ　Ｍｕｌｔｉｐｌｅ　Ａｃｃｅｓｓ）方式の無線基地局である、通信制御方法。     The communication control method according to claim 4, wherein
    The first radio base station is an LTE (Long Term Evolution) radio base station,
    The communication control method, wherein the second radio base station is a W-CDMA (Wideband Code Division Multiple Access) type radio base station.
  6. 　移動機が無線基地局を介して送受信するデータを、ルーティングするルーティング方法であって、
    　第１の無線基地局を介して移動機と送受信するデータのスループットを算出し、
    　前記スループットが予め定められた閾値以下である場合、前記移動機と送受信するデータを中継する基地局を、データ通信速度が前記第１の無線基地局とは異なる第２の無線基地局に切り替える、ルーティング方法。     A routing method for routing data transmitted and received by a mobile device via a radio base station,
    Calculating the throughput of data transmitted to and received from the mobile device via the first radio base station;
    When the throughput is equal to or lower than a predetermined threshold, the base station that relays data transmitted and received with the mobile device is switched to a second radio base station having a data communication speed different from that of the first radio base station. Routing method.
PCT/JP2011/050713 2010-01-20 2011-01-18 Mobile communication system, routing device, communication control method and routing method WO2011090013A1 (en)

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JPH0897824A (en) * 1994-09-26 1996-04-12 N T T Ido Tsushinmo Kk Method for allocating radio channel in mobile communication system
JP2002271847A (en) * 2000-12-19 2002-09-20 Ntt Docomo Inc Wireless channel changeover method, mobile communication system, and base station and wireless station
WO2009057782A1 (en) * 2007-11-02 2009-05-07 Ntt Docomo, Inc. Mobile communication system, control apparatus and method

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JPH0897824A (en) * 1994-09-26 1996-04-12 N T T Ido Tsushinmo Kk Method for allocating radio channel in mobile communication system
JP2002271847A (en) * 2000-12-19 2002-09-20 Ntt Docomo Inc Wireless channel changeover method, mobile communication system, and base station and wireless station
WO2009057782A1 (en) * 2007-11-02 2009-05-07 Ntt Docomo, Inc. Mobile communication system, control apparatus and method

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