WO2012032783A1 - 通信システム、通信方法、並びに移動端末及び移動基地局装置 - Google Patents
通信システム、通信方法、並びに移動端末及び移動基地局装置 Download PDFInfo
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- WO2012032783A1 WO2012032783A1 PCT/JP2011/005058 JP2011005058W WO2012032783A1 WO 2012032783 A1 WO2012032783 A1 WO 2012032783A1 JP 2011005058 W JP2011005058 W JP 2011005058W WO 2012032783 A1 WO2012032783 A1 WO 2012032783A1
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- bearer
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- 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
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- 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
- H04W88/02—Terminal devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
- H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
- H04W36/1446—Reselecting a network or an air interface over a different radio air interface technology wherein at least one of the networks is unlicensed
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Definitions
- the present invention relates to a communication system, a communication method, a mobile terminal, and a mobile base station apparatus for connecting a mobile terminal accommodated in a mobile base station to a local network through an appropriate route.
- Non-Patent Document 1 A local network connection via a femto base station is being studied by a standardization body that develops cellular standard technology. Particularly, in the 3GPP (3 rd Generation Partnership Project) , local IP access; network architecture as (Local IP Access LIPA), method, development of protocols have been developed (Non-Patent Document 1).
- Non-Patent Document 1 a mobile terminal specifies an access point name (Access Point Name; hereinafter referred to as APN) as one of identifiers indicating a local network (hereinafter also referred to as a LIPA network) as a connection destination.
- APN Access Point Name
- LIPA IP access
- RIPA Remote IP Access
- the femto base station installed at home is connected to the operator's core network via a broadband line.
- the femto base station establishes a connection to the core network by connecting to the nearby macro base station via the cellular line, and maintains the connection of the mobile terminal under the femto base station To do.
- a technique for expanding the coverage of a cellular communication system using a cellular line is particularly called a relay technique (or mobile relay technique).
- the relay technology in 3GPP is being studied in TR36.806.
- a mobile base station When a mobile terminal accommodated in a femto base station that moves as described above (hereinafter referred to as a mobile base station) moves together with the mobile base station, the movement in the cellular system is concealed. In other words, since the upper base station does not change when viewed from the mobile terminal, the movement is not detected, and the movement management process (Tracking Update Procedure specified in TS23.401, Location Update Procedure specified in TS23.060, etc.) ) Or handover processing. Thereby, when the mobile base station accommodates a plurality of mobile terminals, the mobility management signaling from each mobile terminal can be reduced, and the traffic cost can be reduced.
- the connection to the local network is performed by the mobile terminal explicitly specifying, and switching between LIPA and RIPA is also performed by the mobile terminal by reconnection or by handover processing. It is assumed that
- a mobile base station In order to solve these problems, there is a method in which a mobile base station establishes a secure tunnel such as a home home gateway and a VPN (Virtual Private Network) and accommodates local network connections of mobile terminals under the mobile base station. Conceivable.
- a secure tunnel such as a home home gateway and a VPN (Virtual Private Network)
- TR36.806 discloses two methods for realizing a mobile base station.
- One is a method of establishing a PDN connection and accommodating the PDN connection of the mobile terminal (UE) on the same as a conventional mobile terminal (called User Equipment; UE).
- the PDN connection is a connection with a public data network (Public Data Network; PDN).
- PDN Public Data Network
- the PDN to which the mobile base station is connected is for routing the UE traffic in the core network, and external reachability such as the Internet is essentially unnecessary.
- the PDN connected to the mobile base station may cause unnecessary traffic (for example, malicious packets) to be transferred and reduce the security level by causing UE traffic to reach an external network such as the Internet.
- the relay base station is originally an operator facility, and if the relay base station directly communicates with an external network, the security level is lowered, and it is considered that the relay base station is not implemented as an operator managing the mobile base station.
- the second method is a method for accommodating UE traffic by establishing only a radio bearer between a mobile base station that functions as a relay node and a macro base station that accommodates the mobile base station.
- the mobile base station since the mobile base station does not establish a PDN connection, it does not have an IP address. That is, the mobile base station cannot establish a VPN tunnel on the IP network.
- An object of the present invention is to provide a communication system, a communication method, and a mobile terminal and a mobile device used in the communication method for establishing an appropriate communication path to the local network of the mobile terminal according to the connection form of the mobile base station. It is to provide a base station apparatus.
- the present invention provides a base station processing unit that receives a connection request from a mobile terminal accommodated by the mobile device, and a local station of the mobile terminal according to a backhaul media to which the mobile device is connected based on the connection request from the mobile terminal.
- a mobile base station apparatus comprising a switching processing unit that switches a connection to a network to either a local IP connection or a remote IP connection.
- the mobile base station device also includes a first communication unit that controls communication with the local network, a second communication unit that controls communication with a macro base station, and a third unit that controls communication with the mobile terminal.
- the connection of the mobile terminal to the local network is switched to the local IP connection
- the backhaul media is the second communication unit
- the connection of the mobile terminal to the local network is switched to the remote IP connection.
- the present invention is capable of accommodating a plurality of mobile terminals including an active mode mobile terminal and an idle mode mobile terminal, connected to a local network, a mobile base station device connected to a local network, and the plurality of mobile terminals
- a mobile communication system comprising a mobile terminal state and an MME that performs mobile management, wherein the mobile base station device is based on a connection request of the mobile terminal in an active mode according to backhaul media to which the mobile device is connected , Switching the connection of the mobile terminal to the local network to either local IP connection or remote IP, and the MME determines whether the idle mode is in the idle mode based on the bearer modification instruction of the mobile terminal in the idle mode extracted by the local gateway.
- the present invention can accommodate a plurality of mobile terminals including a mobile terminal in an active mode and a mobile terminal in an idle mode, and can be connected to a local network via a local gateway.
- a communication system comprising: an MME connected to and configured to perform status management and mobility management of the plurality of mobile terminals, wherein the local gateway is configured to receive the mobile base station from a local network based on reception of a response from the mobile base station device.
- the active mode For the mobile terminal, it carried a bearer modification request to the mobile base station device, wherein the mobile terminal in idle mode, does not perform bearer modification request to the mobile base station apparatus provides communication system.
- the present invention is capable of accommodating a plurality of mobile terminals including an active mode mobile terminal and an idle mode mobile terminal, connected to a local network, a mobile base station device connected to a local network, and the plurality of mobile terminals
- a mobile communication system comprising: a mobile terminal state and a mobile management MME, wherein the mobile base station apparatus detects a backhaul media switching, and establishes a bearer release established by the plurality of mobile terminals accommodated therein
- the identification information of the own device included in the instruction message is transmitted to the MME, and the MME extracts the plurality of mobile terminals that have established bearers based on the identification information of the mobile base station device, and the extracted plurality
- a communication system that performs state management and mobility management of mobile terminals is provided.
- the present invention is capable of accommodating a plurality of mobile terminals including an active mode mobile terminal and an idle mode mobile terminal, connected to a local network, a mobile base station device connected to a local network, and the plurality of mobile terminals
- a communication system comprising a mobile terminal state and a mobile management MME, wherein when the mobile base station apparatus detects switching of backhaul media, it is included in a bearer modification request established by the plurality of mobile terminals
- the identification information of the own device is transmitted to the MME, and the MME extracts the plurality of mobile terminals that have established bearers based on the identification information of the mobile base station device, and the plurality of mobile terminals received from the local gateway.
- a bearer modification request to the mobile base station device is issued for the mobile terminal in the active mode. Subjecting said for the mobile terminal in idle mode, does not perform bearer modification request to the mobile base station device, to provide a communication system.
- the present invention operates a wireless communication unit that performs processing for connecting to a mobile base station device, a control unit that controls communication via the mobile base station device, and an application that performs communication using an established communication connection
- An application unit, and the control unit based on a bearer release instruction from the mobile base station device based on backhaul media switching received via the wireless communication unit,
- the connection to the network is switched to either one of the local IP connection or the remote IP connection
- the application unit operates an application that performs communication through the communication connection of either the switched local IP connection or remote IP connection.
- the present invention is also a communication method for switching a connection of a mobile terminal accommodated in a mobile base station device to a local network, wherein a connection request to the local network is transmitted from the mobile terminal to the mobile base station device. And transmitting the connection of the mobile terminal to the local network based on a backhaul medium to which the mobile base station device is connected based on a connection request to the local network from the mobile terminal. And switching to any one of the IP connections.
- the connection path to the local network of the mobile terminal is either direct connection or remote connection according to the connection form of the mobile base station.
- an appropriate communication path of the mobile terminal can be established. Furthermore, even when the mobile terminal is accommodated in the mobile base station and the movement in the communication system is concealed, it is possible to prevent the local network connection from being disconnected unexpectedly, and to ensure user convenience.
- FIG. 3 is a block diagram showing a configuration of mobile base station 20 according to Embodiment 1.
- A "UE connection process” flow chart of mobile base station 20 according to Embodiment 1
- B "bearer switching process” flow chart of mobile base station 20 according to Embodiment 1
- FIG. 2 is a block diagram showing a configuration of mobile terminals 10a and 10b according to Embodiment 1.
- FIG. 1 The figure which shows the communication system structure which concerns on Embodiment 2.
- FIG. 2 The figure which shows one state of the communication system which concerns on Embodiment 2.
- Connection sequence diagram of mobile terminals 10a and 10b according to Embodiment 2 Switching sequence diagram of local network connection in the second embodiment (A) “UE connection process” flowchart of mobile base station 20 according to Embodiment 2, (b) “bearer switching process” flowchart of mobile base station 20 according to Embodiment 2
- FIG. 2 The figure for demonstrating operation
- FIG. 1 Block diagram showing the configuration of UE-MME 60 according to Embodiment 2
- Local network connection switching sequence diagram according to the third embodiment The figure for demonstrating operation
- FIG. The figure which shows the communication system structure which concerns on Embodiment 5.
- FIG. The figure which shows one state of the communication system which concerns on Embodiment 5.
- Connection sequence diagram of mobile terminals 10a and 10c according to Embodiment 5 Local network connection switching sequence diagram according to the fifth embodiment (A) "UE connection process” flow chart of mobile base station 20 according to Embodiment 5, (b) "bearer switching process” flow chart of mobile base station 20 according to Embodiment 5
- FIG. The figure which shows the structure of a communication system including the public access system 3700 comprised by techniques, such as WiMAX, WLAN, and 3GPP2.
- the mobile base station functioning as a relay node detects that the mobile terminal has moved due to a change in the backhaul of the mobile base station, and at that timing, The LIPA connection of the mobile terminal is disconnected to prompt reconnection, and the path at the time of reconnection is correctly controlled according to the type of backhaul media (Backhaul Media). Therefore, according to the communication system according to the present embodiment, the connection route to the local network of the mobile terminal is switched to either direct connection or remote connection according to the connection form of the mobile base station, and the optimal communication of the mobile terminal A route can be established.
- FIG. 1 is a diagram showing a configuration of a communication system according to Embodiment 1 of the present invention.
- the communication system shown in FIG. 1 includes a plurality of mobile terminals (UE) 10a and 10b (hereinafter referred to as mobile terminals 10a and 10b) connected to the local RAN 100, a mobile base station 20 forming the local RAN 100, A local gateway (LGW) 30 (hereinafter referred to as LGW 30) that functions as a gateway for making a LIPA connection to the local network 110 via the base station 20 and a macro base station connected to the macro RAN 130 an eNB 40 (hereinafter referred to as macro eNB 40), a UE-MME 60 connected to the core network 140, a serving gateway (SGW) 70 (hereinafter referred to as SGW 70) connected to the core network 140, Local RAN 10 If, it includes a local network 110, a provider network 120, a macro RAN 130, a core network 140 of the operator,
- SGW serving gateway
- the core network 140 includes an RN-MME 50 that is a mobility management entity (MME) of a relay node (see FIG. 2).
- MME mobility management entity
- the mobile base station 20 is directly connected to the local network 110.
- the mobile terminals 10 a and 10 b are connected to the local network 110 via the mobile terminal station 20 and the LGW 30 by LIPA.
- the UE-MME 60 is a mobility management entity (MME) of the mobile terminals 10a and 10b, and implements the state and mobility management of the mobile terminals 10a and 10b.
- MME mobility management entity
- FIG. 2 is a diagram illustrating a state of the communication system according to the first embodiment.
- the mobile base station 20 connects to the macro eNB 40 and establishes a radio bearer under the management of the RN-MME 50.
- the mobile terminals 10 a and 10 b connect to the LGW 30 via the mobile base station 20 and the SGW 70 and establish a RIPA connection to the local network 110.
- FIG. 3 is a diagram showing a connection sequence of the mobile terminals 10a and 10b in the configuration of the communication system shown in FIG.
- FIG. 4 is a sequence diagram (1) for explaining the bearer release instruction.
- FIG. 5 is a sequence diagram (1) for explaining the bearer correction instruction.
- the mobile base station 20 secures connectivity to the core network 140 via the local network 110 and the provider network 120 (step S301: core). Connection to NW is completed). Specifically, the mobile base station 20 establishes a secure connection to the core network 140 using a protocol such as PPPoE.
- the mobile terminal 10a starts connection processing.
- the mobile terminal 10a transmits a connection request to the mobile base station 20
- the mobile base station 20 transfers the connection request to the UE-MME 60
- processing is performed based on the initial connection procedure disclosed in TR23.829.
- Steps S303 to S305 connection processing
- a communication connection for LIPA (for example, a PDN connection or a PDP context) is established between the mobile terminal 10a and the LGW 30.
- the mobile terminal 10b establishes a communication connection for LIPA between the mobile terminal 10b and the LGW 30 (steps S306 to S308: connection processing).
- a bearer release is performed for a local network connection switching sequence when the local RAN 100 including the mobile base station 20 and the mobile terminals 10 a and 10 b moves and is accommodated in the macro eNB 40.
- Two methods will be described: a method for instructing bearer and a method for instructing bearer correction.
- FIG. 4 is a sequence diagram illustrating a method for instructing bearer release.
- the mobile base station 20 detects backhaul switching (step S401: backhaul switching).
- the backhaul of the mobile base station 20 uses communication media such as a wired LAN such as Ethernet (registered trademark), a wireless LAN, a wireless PAN (Personal Area Network), and a millimeter wave communication link. use.
- the mobile base station 20 uses a cellular line when connecting to the macro RAN 130.
- it is detected that the backhaul of the mobile base station 20 has been switched from, for example, a wired LAN to a cellular line.
- the mobile base station 20 may detect that the backhaul of the mobile base station 20 has actually been switched. Alternatively, the mobile base station 20 may determine that the backhaul of the mobile base station 20 has been switched by receiving a signal instructing switching of the backhaul of the mobile base station 20. As the signal for instructing switching of the backhaul of the mobile base station 20, for example, a switching instruction signal input by a user through a screen, a button, or the like, a switching instruction signal input remotely, or the like can be considered. At that time, the mobile base station 20 determines that the backhaul of the mobile base station 20 has been switched when the connectivity of the backhaul media to be switched to is confirmed. For example, the mobile base station 20 can accurately switch backhaul media (Backhaul Media) while preventing erroneous detection.
- backhaul media Backhaul Media
- the mobile base station 20 Upon detecting backhaul switching to the cellular line, the mobile base station 20 performs connection processing with the RN-MME 50 via the macro eNB 40 (steps S403 and S404: connection processing), and communication for accommodating UE traffic.
- a connection is established (step S405: connection establishment).
- the detailed operation for establishing the communication connection can use, for example, a procedure as disclosed in TR36.806.
- the mobile base station 20 sends a bearer release instruction to the bearer established by the accommodated mobile terminals 10a and 10b based on the bearer context information held by the UE. -Transmit to MME 60 (step S406: Bearer release instruction).
- the bearer established by the mobile terminals 10a and 10b to be accommodated includes, for example, an EPS bearer, a PDN connection, a PDP context, a radio bearer, and the like.
- step S406 the mobile base station 20 performs the release process of the applicable bearer (especially radio bearer) with respect to the mobile terminals 10a and 10b (steps S407 and S408: bearer release process).
- the applicable bearer especially radio bearer
- the mobile base station 20 may issue a bearer release instruction for each bearer. Further, the mobile base station 20 may issue a bearer release instruction for each mobile terminal, or for each PDN connection or PDP context. Furthermore, the mobile base station 20 may issue a bearer release instruction to all bearers at once. Thereby, the mobile base station 20 can reduce the signaling traffic.
- the UE-MME 60 that has received the bearer release instruction in step S406 transfers the bearer deletion instruction to the LGW 30 (step S409: bearer deletion instruction). Then, the LGW 30 releases the context for the instructed bearer and transmits a bearer deletion request to the UE-MME 60 (Step S411: Bearer deletion request). Then, UE-MME 60 transmits a bearer deletion response to LGW 30 after releasing the instructed bearer context (step S413: bearer deletion response). And the bearer release process is completed.
- the SGW 70 is allocated to the LIPA connection of the mobile terminals 10a and 10b, the SGW 70 is also involved in the bearer deletion process between the UE-MME 60 and the LGW 30.
- the mobile terminals 10a and 10b that have released the bearer constituting the RIPA connection perform reconnection processing (steps S415 and S417: connection processing). At this time, the mobile terminals 10a and 10b perform reconnection by designating the access point name (APN) for LIPA again. This is because the mobile terminals 10a and 10b have not detected their own movement and have recognized that LIPA to the local network is still possible.
- APN access point name
- the mobile base station 20 In response to the reconnection of the mobile terminals 10a and 10b, the mobile base station 20 rewrites the access point name (APN) for RIPA or the access point name for RIPA in the connection request message from the mobile terminals 10a and 10b.
- Information instructing switching to (APN) is added, and the UE-MME 60 continues the reconnection process of the mobile terminals 10a and 10b.
- the information instructing switching to the access point name (APN) for RIPA added to the connection request message from the mobile terminals 10a and 10b is, for example, the access point name (APN) for RIPA and switching.
- An instruction flag or an access point name (APN) for RIPA can be considered.
- the UE-MME 60 selects the connection to the access point name (APN) for RIPA, that is, selects the SGW 70 for connection to the LGW 30, and moves. Allocation to terminals 10a and 10b is established and a RIPA connection is established (steps S419 and S421: connection establishment).
- APN access point name
- the mobile base station 20 may notify the mobile terminals 10a and 10b of the access point name (APN) for RIPA during the bearer release process. Further, the mobile base station 20 may notify the mobile terminals 10a and 10b of information (for example, a flag) that prompts connection to the RIPA access point name (APN) during the bearer release process. In response to this, the mobile terminals 10a and 10b specify the access point name (APN) for RIPA and perform reconnection processing. As a result, it is possible to reduce the burden of the mobile base station 20 checking the connection request messages from the mobile terminals 10a and 10b one by one and replacing them with RIPA access point names (APN).
- API access point name
- UEs mobile terminals
- FIG. 5 is a sequence diagram (1) for explaining a method for instructing bearer correction.
- step S501 backhaul switching
- step S503 and 505 connection processing
- step S507 connection establishment
- a bearer modification request message for the bearer established by the accommodated mobile terminals 10a and 10b is transmitted to the UE-MME 60 (step S509: bearer modification). request).
- the bearer established by the mobile terminals 10a and 10b to be accommodated includes an EPS bearer, a PDN connection, a PDP context, a radio bearer, and the like.
- the mobile base station 20 instructs to switch the connection destination of the target bearer from the access point name (APN) for LIPA to the access point name (APN) for RIPA.
- the mobile base station 20 may add an access point name (APN) for RIPA to the bearer modification request message.
- the mobile base station 20 may explicitly add information (for example, a flag) instructing switching of the access point name (APN) to the bearer modification request message.
- the mobile base station 20 may issue a bearer modification request message for each bearer. Further, the mobile base station 20 may issue a bearer modification request message for each mobile terminal or for each PDN connection / PDP context. Furthermore, the mobile base station 20 may issue a bearer modification request message to all the bearers at once, whereby the mobile base station 20 can reduce signaling traffic.
- the UE-MME 60 that has received the bearer modification request selects and assigns the SGW 70 for connecting to the access point name (APN) for RIPA (step 511: SGW selection), and adds the contact address of the LGW 30 and the like.
- a bearer modification request message is transmitted to the SGW 70 (step S513: bearer modification request).
- the SGW 70 that has received the bearer modification request message generates a bearer contest for the target mobile terminals 10 a and 10 b and transfers the bearer modification request message to the LGW 30.
- the LGW 30 modifies the bearer context of the target mobile terminals 10a and 10b (for example, the contact address of the SGW 70) as a bearer modification process, and transmits a bearer modification response message to the SGW 70.
- Step S515 Bearer correction processing
- the SGW 70 transmits a bearer modification response message to the UE-MME 60 (step S517: bearer modification response).
- the UE-MME 60 updates the bearer context of the target mobile terminals 10a and 10b, and transmits a bearer modification response message to the mobile base station 20 (step S519: bearer modification response). Based on the received bearer modification response message, the mobile base station 20 performs a bearer modification process for updating the radio bearers (particularly, QoS parameters) of the mobile terminals 10a and 10b (steps S521 and S523: bearer modification process).
- the gateway derived from the access point name (APN) for LIPA and the access point name (APN) for RIPA is different, relocation from the LGW 30 to the PDN gateway (PDN Gateway: PGW) for RIPA, or Relocation from the PDN gateway (PGW) for RIPA to the LGW 30 may be performed.
- PGW PDN gateway
- PGW PDN gateway
- messages exchanged between the UE-MME 60 and the LGW 30 do not necessarily have to pass through the mobile base station 20.
- LGW 30 is directly connected to the core network.
- the LGW 30 constructs a secure tunnel (for example, VPN) with an external connection device (for example, a VPN gateway) on the core network via the provider network, a core such as UE-MME 60 or SGW 70 Messages can be exchanged directly with network devices. Thereby, the load by the message processing of the mobile base station 20 can be reduced.
- a secure tunnel for example, VPN
- an external connection device for example, a VPN gateway
- the mobile terminals (UEs) 10a and 10b specify the APN for LIPA and the APN for RIPA, but do not specify the APN for LIPA and the APN for RIPA.
- an indicator designating LIPA or RIPA may be added. This eliminates the need to generate and manage a large number of APNs, and reduces the processing burden on network devices (eg, UE-MME 60, SGW 70, and LGW 30) in connection management of mobile terminals (UE) 10a and 10b. it can.
- FIG. 6 is a block diagram showing a configuration of mobile base station 20 according to Embodiment 1.
- the mobile base station 20 shown in FIG. 6 accommodates a local communication unit 21 that controls communication with the local network 110, and a cellular communication unit (core network) 22 that controls communication with the macro eNB 40 of the macro RAN 130.
- a cellular communication unit (UE) 23 that controls communication with the mobile terminals 10a and 10b, an LGW communication unit 24 that controls communication with the LGW 30 via the local communication unit 21, and all communication units (local communication unit 21).
- UE cellular communication unit
- a base station processing unit 25 that performs processing for accommodating the mobile terminals 10a and 10b via the cellular communication unit (core network) 22, the cellular communication unit (UE) 23, and the LGW communication unit 24) And a switching processing unit 26 that performs the switching process.
- the local communication unit 21 corresponds to a communication interface (communication device) for connecting to a communication link such as a wired LAN or a wireless LAN.
- FIG.7 (a) is a "UE connection process” flowchart of the mobile base station 20 for implementing the connection process to a local network by a mobile terminal (UE),
- FIG.7 (b) is a bearer switching of UE.
- FIG. 6 is a “bearer switching process” flowchart of the mobile base station 20 for implementing
- step S701 connection request. Reception
- the base station processing unit 25 notifies the switching processing unit 26 to that effect.
- the switching processing unit 26 selects a connection destination based on the backhaul media (Backhaul Media) used when the notification is received from the base station processing unit 25 (step S703: connection destination selection). That is, when the backhaul media is the local communication unit 21, the switching processing unit 26 selects local IP access (LIPA). When the backhaul media is the cellular communication unit (core network), the switching processing unit 26 selects remote access (RIPA) to the local network.
- backhaul media Backhaul Media
- LIPA local IP access
- the switching processing unit 26 selects remote access (RIPA) to the local network.
- the access point name (APN) corresponding to the selected connection destination the access point name (APN) for LIPA or the access point name (APN) for RIPA) is the connection request message of the mobile terminals 10a and 10b. (Or overwritten with the access point name (APN) described in the connection request message), and via the base station processing unit 25 and backhaul media (cellular communication unit (core network) 22 or local communication unit 21). And transferred to the UE-MME 60 (step S705: connection transfer request). Thereafter, the base station processing unit 25 performs an operation necessary for the connection processing of the mobile terminals 10a and 10b, such as processing a message received from each communication unit (step S707: execution of subsequent connection processing).
- the switching processing unit 26 detects that the backhaul media (Backhaul Media) has been switched (or needs to be switched) (step S731). : Backhaul switching detection), the switching processing unit 26 is, as a processing mode of the base station processing unit 25, (1) a mode in which it is connected via a communication medium such as a wired / wireless LAN and operates as a femto base station, or (2) One of the modes operating as a relay node via the cellular line is selected and applied to the base station processing unit 25 (step S733: change processing mode).
- the switching processing unit 26 instructs the base station processing unit 25 to transmit a bearer modification request message via the cellular communication unit (core network) 22 or the local communication unit 21.
- the switching processing unit 26 instructs the base station processing unit 25 to transmit a bearer release instruction via the cellular communication unit (core network) 22, the local communication unit 21, or the cellular communication unit (UE) 23.
- Step S735 Bearer modification request or bearer release instruction.
- the base station processing unit 25 performs operations necessary for update processing and release processing for the bearers of the mobile terminals 10a and 10b, such as processing messages received from the respective communication units (step S737: execution of subsequent processing).
- FIG. 8 is a block diagram showing the configuration of the mobile terminals 10a and 10b. Since the mobile terminals 10a and 10b have the same configuration, the mobile terminal 10a (or 10b) is represented in FIG. 8 for convenience.
- the mobile terminal 10a (or 10b) shown in FIG. 8 includes a wireless communication unit 11 for connecting to the mobile base station 20, a communication processing unit 12 for controlling communication via the mobile base station 20, and an established communication connection. And an application unit 13 that operates an application that performs communication.
- FIG. 9 is a “bearer release instruction reception process” flowchart of the mobile terminals 10a and 10b according to the first embodiment.
- step S901 APN extraction
- the communication processing unit 12 performs a process for releasing a bearer for connecting to the local network 110 (step S903: bearer release process). Specifically, a bearer release procedure as disclosed in TS23.401 and TS23.060 is performed.
- the mobile terminal 10a (or 10b) starts connection processing to the PDN indicated by the previously extracted access point name (APN) (step S905: connection to the extracted APN). Specifically, an initial connection procedure (Initial Attach Procedure) or an additional connection connection procedure (Additional PDN Connectivity Procedure) as disclosed in TS23.401 and TS23.060 is performed.
- API access point name
- the mobile terminal 10a (or 10b) that supports the system operation shown in FIG. 5 performs bearer correction processing disclosed in the conventional TS23.401 and TS23.060.
- the mobile terminal 10a (or 10b) changes (1) the access point name (APN) of the connection destination from the mobile base station 20 during the bearer correction process performed with the mobile base station 20.
- APN access point name
- the mobile terminal 10a (or 10b) Modify the parameter to an appropriate value, or (b) run the application, or (c) implement other applications suitable for the connected network or QoS after the change. It may be.
- Embodiment 2 In the communication system according to Embodiment 1, it is assumed that all the mobile terminals (UEs) are in the active mode. However, when the mobile terminal (UE) under the control of the mobile base station is in the idle mode, the mobile base station does not have a context of the idle mode user equipment (UE). Release and bearer modification processing cannot be performed. Therefore, in the communication system according to Embodiment 2, the idle mode UE is identified based on the UE context held by the LGW, and the connection of the idle mode UE is switched at the same timing as the switching of the active mode UE. Therefore, according to the communication system according to the present embodiment, the connection route to the local network of the mobile terminal is switched to either direct connection or remote connection according to the connection form of the mobile base station, and the optimal communication of the mobile terminal A route can be established.
- UE user equipment
- the idle mode UE indicates a mobile terminal (UE) in the idle mode
- the active mode UE indicates a mobile terminal (UE) in the active mode
- FIG. 10 is a diagram showing a communication system configuration according to Embodiment 2 of the present invention.
- the communication system shown in FIG. 10 differs from the communication system shown in FIG. 1 in that the mobile terminal 10a is an active mode UE among the mobile terminals 10a and 10c accommodated by the mobile base station 20, and the mobile terminal 10c. Is an idle mode UE.
- the second embodiment is the same as the first embodiment, and in FIG. 10, the same reference numerals are given to components common to FIG. 1.
- the mobile base station 20 is directly connected to the local network 110. Further, the mobile terminals 10 a and 10 c are LIPA connected to the local network 110 via the mobile base station 20 and the LGW 30.
- the UE-MME 60 is connected to the core network 140 and performs the status and mobility management of the mobile terminals 10a and 10c.
- the mobile terminal 10a in the active mode may be referred to as the active mode UE 10a
- the mobile terminal 10c in the idle mode may be referred to as the idle mode UE 10c.
- FIG. 11 is a diagram showing one state of the communication system according to the second embodiment, and shows a state when the mobile base station 20 leaves the local network 110 and is connected to the macro eNB 40 of the macro RAN 130.
- the communication system shown in FIG. 11 is different from the communication system shown in FIG. 2 in that the active mode UE 10a and the idle mode UE 10c are mixed. Except for this point, the second embodiment is the same as the first embodiment, and in FIG. 11, the same reference numerals are given to components common to FIG. 2.
- FIG. 12 is a diagram showing a connection sequence of the mobile terminals 10a and 10c in the configuration of the communication system shown in FIG.
- the mobile base station 20 prior to connecting the mobile terminals 10a and 10c, the mobile base station 20 ensures connectivity to the core network 140 via the local network 110 and the provider network 120 (step S1201: core). Connection to NW is completed). Specifically, the mobile base station 20 establishes a secure connection to the core network 140 using a protocol such as PPPoE.
- the mobile terminal 10a starts connection processing.
- the mobile terminal 10a transmits a connection request to the mobile base station 20
- the mobile base station 20 transfers the connection request to the UE-MME 60
- processing is performed based on the initial connection procedure disclosed in TR23.829.
- Steps S1203 to S1205 connection processing
- a communication connection for LIPA (for example, a PDN connection or a PDP context) is established between the mobile terminal 10a and the LGW 30.
- the mobile terminal 10c establishes a communication connection for LIPA between the mobile terminal 10c and the LGW 30 (steps S1206 to S1208: connection processing).
- step S1210 transition to the idle mode.
- FIG. 13 is a switching sequence diagram of local network connection in the present embodiment.
- Step S1301 backhaul switching
- step S1303 connection processing
- step S1307 Connection establishment
- a bearer modification request message for the bearer established by the mobile terminal 10a to be accommodated is transmitted to the UE-MME 60
- Step S1309 Bearer Correction request
- the bearer established by the accommodated mobile terminal 10a refers to an EPS bearer, a PDN connection, a PDP context, a radio bearer, and the like.
- the mobile base station 20 instructs to switch the connection destination of the target bearer from the access point name (APN) for LIPA to the access point name (APN) for RIPA.
- the mobile base station 20 may add an access point name (APN) for RIPA to the bearer modification request message.
- the mobile base station 20 may explicitly add information (for example, a flag) instructing switching of the access point name (APN) to the bearer modification request message.
- the mobile base station 20 may issue a bearer modification request message for each bearer. Further, the mobile base station 20 may issue a bearer modification request message for each mobile terminal or for each PDN connection / PDP context. Furthermore, the mobile base station 20 may issue a bearer modification request message to all the bearers at once, whereby the mobile base station 20 can reduce signaling traffic.
- the UE-MME 60 that has received the bearer modification request selects and assigns the SGW 70 for connecting to the access point name (APN) for RIPA (step 1311: SGW selection), and adds the contact address of the LGW 30 and the like.
- a bearer modification request message is transmitted to the SGW 70 (step S1313: bearer modification request).
- the SGW 70 of the core network is assigned at the time of LIPA connection, the same SGW may be used, thereby reducing the processing load accompanying the SGW selection in the UE-MME 60.
- the SGW 70 that has received the bearer modification request message generates a bearer contest for the target mobile terminal 10 a and transfers the bearer modification request message to the LGW 30.
- the LGW 30 modifies the bearer context of the target mobile terminal 10a (for example, the contact address of the SGW 70) as a bearer modification process, and transmits a bearer modification response message to the SGW 70 (step).
- S1315 Bearer correction processing
- the SGW 70 transmits a bearer modification response message to the UE-MME 60 (step S1317: bearer modification response).
- the UE-MME 60 updates the bearer context of the target mobile terminal 10a, and transmits a bearer modification response message to the mobile base station 20 (step S1319: bearer modification response). Based on the received bearer modification response message, the mobile base station 20 performs a bearer modification process for updating the radio bearer (particularly the QoS parameter) of the mobile terminal 10a (step S1321: bearer modification process).
- the gateway derived from the access point name (APN) for LIPA and the access point name (APN) for RIPA is different, relocation from the LGW 30 to the PDN gateway (PDN Gateway: PGW) for RIPA, or Relocation from the PDN gateway (PGW) for RIPA to the LGW 30 may be performed.
- PGW PDN gateway
- PGW PDN gateway
- step S1301 to step S1321 which are the switching processing for the mobile terminal 10a in the active mode
- the switching sequence shown in FIG. 13 is different from the sequence shown in FIG. 5 in the processing of LGW 30 that is performed after step S1321. That is, the LGW 30 that has completed the bearer modification processing for the active mode UE 10a and has completed the path switching for the local network connection holds bearer context information (context information for managing EPS bearer or PDP context). Based on this, an idle mode UE is extracted (step S1331: remaining UE detection). That is, the mobile terminal (UE) excluding the active mode UE that has previously performed the bearer correction process is extracted as the idle mode UE.
- bearer context information context information for managing EPS bearer or PDP context
- the LGW 30 may extract only the mobile terminals (UE) accommodated by the mobile base station 20, in particular.
- the CSG, cell ID, base station ID, location registration area ID for example, Tracking Area ID, Location Area ID, Routing Area ID
- the mobile terminal (UE) belonging to the same CSG, cell ID, base station ID, and location registration area ID as the active mode UE that has previously performed the bearer correction process.
- a mobile terminal (UE) that has not yet been subjected to bearer correction processing is extracted as being an idle mode UE.
- the LGW 30 performs bearer correction processing for the extracted idle mode UE 10c on the SGW 70 (step S1333: bearer correction processing).
- the SGW 70 is the same SGW that was previously assigned to the active mode UE 10a. This is because the mobile terminals (UEs) accommodated in the same mobile base station are located in the same location, and thus are inevitably accommodated in the same SGW. It is.
- the SGW 70 generates a bearer context of the idle mode UE 10c, sets the state of the mobile terminal 10c to the idle mode, and transmits a bearer modification instruction message to the UE-MME 60 (step S1335: bearer modification instruction).
- the UE-MME 60 updates the bearer context of the mobile terminal 10c held by the UE-MME 60 based on the received bearer modification instruction message (for example, updates the contact address of the SGW) and records it in the context of the mobile terminal 10c. From this state, it is detected that the mode is the idle mode, and no bearer correction request is made to the mobile base station 20. Thereby, the mobile terminal 10c can continue the idle mode, and the battery consumption of the mobile terminal 10c can be reduced.
- the received bearer modification instruction message for example, updates the contact address of the SGW
- the SGW 70 When the SGW 70 issues a bearer modification instruction to the UE-MME 60, it may explicitly notify that the target mobile terminal 10c is in the idle mode. Later, in the service request processing performed when the mobile terminal 10c returns from the idle mode in step S1337 (in FIG. 13, “return from idle mode”), the entire communication connection including the radio bearer is reconstructed (mainly (Reconfiguration of QoS parameters) is performed (step S1339: service request processing and S1341: bearer modification processing).
- LGW 30 derived from the LIPA access point name (APN) and the RIPA access point name (APN)
- APN LIPA access point name
- APN RIPA access point name
- LGW relocation from LGW 30 to RIPA PGW May be implemented. More specifically, first, the bearer context of the active UE is handed over from the LGW 30 to the PGW. Thereafter, PGW relocation for the idle mode UE is performed in the bearer modification process of the idle mode UE performed by the LGW 30.
- FIGS. 14 (a) and 14 (b) The operation of the mobile base station 20 of the present embodiment will be described using FIGS. 14 (a) and 14 (b).
- the configuration of mobile base station 20 in the present embodiment is the same as the configuration of the mobile base station shown in FIG. FIG. 14 (a) is a “UE connection process” flow diagram of mobile base station 20 according to Embodiment 2
- FIG. 14 (b) is a “bearer switching process” of mobile base station 20 according to Embodiment 2. It is a flow diagram.
- step S1401 reception of connection request.
- the base station processing unit 25 notifies the switching processing unit 26 accordingly.
- the switching processing unit 26 selects a connection destination based on the backhaul media (Backhaul Media) used when the notification is received from the base station processing unit 25 (step S1403: connection destination selection (LIPA / RIPA)). . That is, when the backhaul media is the local communication unit 21, the switching processing unit 26 selects local IP access (LIPA). When the backhaul media is the cellular communication unit (core network), the switching processing unit 26 selects remote access (RIPA) to the local network.
- backhaul Media backhaul media
- LIPA local IP access
- the switching processing unit 26 selects remote access (RIPA) to the local network.
- the access point name (APN) corresponding to the selected connection destination the access point name (APN) for LIPA or the access point name (APN) for RIPA) is the connection request message of the mobile terminals 10a and 10c. (Or overwritten with the access point name (APN) described in the connection request message), and via the base station processing unit 25 and backhaul media (cellular communication unit (core network) 22 or local communication unit 21). And transferred to the UE-MME 60 (step S1405: connection transfer request). Thereafter, the base station processing unit 25 performs operations necessary for mobile terminal (UE) connection processing, such as processing messages received from each communication unit (step S1407: subsequent connection processing execution).
- UE mobile terminal
- the switching processing unit 26 detects that the backhaul media (Backhaul Media) has been switched (or needs to be switched) (step S1431: back). (Howl switching detection), the switching processing unit 26, as a processing mode of the base station processing unit 25, one of a mode operating as a femto base station and a mode operating as a relay node (2) Is applied to the base station processing unit 25 (step S1433: change of processing mode).
- the switching processing unit 26 instructs the base station processing unit 25 to transmit a bearer modification request message via the cellular communication unit (core network) 22 or the local communication unit 21.
- the switching processing unit 26 instructs the base station processing unit 25 to transmit a bearer release instruction via the cellular communication unit (core network) 22, the local communication unit 21, or the cellular communication unit (UE) 23.
- Step S1435 Bearer modification request
- the base station processing unit 25 performs operations necessary for update processing and release processing for the bearers of the mobile terminals 10a and 10c, such as processing messages received from the respective communication units (step S1437: execution of subsequent processing).
- FIG. 15 is a block diagram showing a configuration of LGW 30 according to the second embodiment.
- the LGW 30 shown in FIG. 15 includes a switching processing unit 31 for switching connection to the local network 110, and a mobile base station communication unit 32 for securely communicating with the mobile base station 20 via the local network 110. And an LGW processing unit 33 that executes LGW processing on the mobile base station 20 and the core network device connected to the local network 110, and a local communication unit 34 that controls communication with the local network 110.
- FIG. 16 is a diagram for explaining the operation of the LGW 30 according to the second embodiment.
- the mobile base station communication unit 32 sends a bearer modification request message together with the bearer context of the target mobile terminal 10a from the SGW 70 for connecting to the access point name (APN) for RIPA via the local communication unit 34.
- the mobile base station communication unit 32 corrects the bearer context of the target mobile terminal 10a (step S1603: bearer correction process), and transmits a bearer correction response message to the SGW 70 via the local communication unit 34 (step S1605). : Bearer modification response transmission).
- the switching processing unit 31 extracts the idle mode UE 10c based on the bearer context information held by the LGW 30 itself (step S1607: remaining UE detection). That is, the mobile terminal 10c excluding the active mode UE 10a that has previously performed the bearer correction process is extracted as being an idle mode UE.
- the switching processing unit 31 corrects the extracted bearer context related to the idle mode UE 10c (for example, the SGW address and TEID (Tunnel Endpoint ID) used in GTP and GRE Key (Generic Routing Encapsulation Key) used in PMIP are notified by the SGW. Or set the value of TEID or GRE Key notified to the SGW) and the bearer correction processing for the extracted idle mode UE 10c to the SGW 70 via the LGW processing unit 33.
- step S1609 bearer correction process activation
- the SGW 70 is the same SGW that was previously assigned to the active mode UE 10a.
- FIG. 17 is a block diagram showing a configuration of UE-MME 60 according to the second embodiment.
- the UE-MME 60 illustrated in FIG. 17 includes an MME processing unit 61 for performing MME processing, and a communication unit 63 for transmitting and receiving messages to and from core network devices such as the mobile base station 20 and the SGW 70. .
- FIG. 18 is a diagram for explaining the operation of the UE-MME 60 according to the second embodiment.
- the UE-MME 60 receives the bearer modification request message transferred from the mobile base station 20 via the communication unit 63, and the MME processing unit 61 determines whether or not the connection path of the mobile terminal (UE) has been changed. (Step S1801: Connection path change?). When it is determined that the connection path has been changed (in the case of Yes), the MME processing unit 61 selects the SGW 70 for connecting to the changed access point name (APN) (step S1803: SGW selection).
- the SGW 70 of the core network is assigned at the time of LIPA connection, the same SGW may be used, thereby reducing the processing load accompanying the SGW selection in the UE-MME 60.
- Step S1805 Bearer modification request message transmission
- step S1807 subsequent connection process is performed.
- Embodiment 3 In the communication system according to Embodiment 3, a method will be described in which the LGW 30 detects the movement of the mobile base station 20 and switches the LIPA connection of the mobile terminal (UE) accommodated by the mobile base station 20 to the RIPA connection.
- the connection path to the local network of the mobile terminal is switched to either direct connection or remote connection according to the connection form of the mobile base station, and the optimal communication path of the mobile terminal is determined. Can be established.
- FIG. 19 is a diagram showing a communication system configuration according to the third embodiment.
- the communication system shown in FIG. 19 is different from the communication system shown in FIG. 1 in that the mobile terminal 10a is an active mode UE among the mobile terminals 10a and 10c accommodated by the mobile base station 20, and the mobile terminal 10c. Is an idle mode UE.
- the second embodiment is the same as the first embodiment, and in FIG. 19, the same reference numerals are given to the components common to FIG. 1.
- the mobile base station 20 is directly connected to the local network 110. Further, the mobile terminals 10 a and 10 c are LIPA connected to the local network 110 via the mobile base station 20 and the LGW 30.
- the UE-MME 60 is connected to the core network 140 and performs the status and mobility management of the mobile terminals 10a and 10c.
- the mobile terminal 10a in the active mode may be referred to as the active mode UE 10a
- the mobile terminal 10c in the idle mode may be referred to as the idle mode UE 10c.
- FIG. 20 is a diagram illustrating a state of the communication system according to the third embodiment.
- the difference between the state of the communication system shown in FIG. 20 and the state of the communication system shown in FIG. 2 is that the active mode UE 10a and the idle mode UE 10c are mixed. Except for this point, the second embodiment is the same as the first embodiment.
- the same reference numerals are given to the components common to FIG. 2.
- FIG. 21 is a connection sequence diagram of mobile terminals 10a and 10c according to Embodiment 3.
- the mobile base station 20 prior to the connection of the mobile terminals 10a and 10c, the mobile base station 20 ensures connectivity to the core network 140 via the local network 110 and the provider network 120 (step S2101: core). Connection to NW is completed). Specifically, the mobile base station 20 establishes a secure connection to the core network 140 using a protocol such as PPPoE.
- the mobile terminal 10a starts connection processing.
- the mobile terminal 10a transmits a connection request to the mobile base station 20
- the mobile base station 20 transfers the connection request to the UE-MME 60
- processing is performed based on the initial connection procedure disclosed in TR23.829.
- Steps S2102 to S2104 connection processing
- a communication connection for LIPA for example, a PDN connection or a PDP context
- the mobile terminal 10c establishes a communication connection for LIPA between the mobile terminal 10c and the LGW 30 (steps S2106 to S2108: connection processing).
- step S2110 transition to the idle mode.
- FIG. 22 is a local network connection switching sequence diagram according to the third embodiment.
- the local RAN 100 including the mobile base station 20 and the mobile terminals 10a and 10c is moved and accommodated in the macro eNB 40.
- the local network connection switching sequence will be described.
- the mobile base station 20 switches the backhaul to the cellular line (step S2201: backhaul switching), and establishes connections with the macro eNB 40 and the RN-MME 50 (steps S2202, S2203). : Connection processing, and step S2204: connection establishment).
- the interface to the UE-MME 60 to which the mobile terminals 10a and 10c accommodated by the mobile base station 20 are connected is updated between the mobile base station 20 and the UE-MME 60.
- Step S2205 S1-AP update process.
- the interface to the UE-MME 60 to which the mobile terminals 10a and 10c accommodated by the mobile base station 20 are connected is disclosed as S1-AP in TS23.401.
- the mobile base station 20 becomes able to receive the message regarding the bearer update process activated by the core network device.
- step S2207 detection of mobile base station leaving.
- the mobile terminal UE10a, 10c periodically transmits a survival confirmation packet (for example, ping request) to the mobile base station 20 from when the LIPA connection is established, and the LGW 30 manages response reception. That is, while the mobile base station 20 is connected to the local network 110, it responds to the survival confirmation packet from the LGW 30.
- the LGW 30 Detects the departure of the mobile base station 20 from the local network when the response stops.
- the LGW 30 that has detected the departure of the mobile base station 20 extracts the mobile terminals 10a and 10c that have established the LIPA connection via the mobile base station 20 (step S2209: target UE extraction).
- the LGW 30 is one of the cell ID, base station ID, CSG ID, location registration area ID, etc. of the mobile base station 20 that accommodates the mobile terminals 10a, 10c. (Or a plurality of combinations) is collected, and a mobile terminal (UE) that matches one of the IDs (or a combination of a plurality of IDs) of the mobile base station 20 that detected the departure is set as the target mobile terminal (UE). .
- the LGW 30 to collect any (or a plurality of combinations) of the cell ID, base station ID, CSG ID, location registration area ID, etc. of the mobile base station 20 that accommodates the mobile terminals 10a, 10c.
- (1) The cell ID, base station ID, CSG ID, and location registration area ID of the mobile base station 20 are included in the message transmitted from the mobile terminals 10a and 10c to the LGW 30, or (2) the mobile base station 20 is added to the LGW 30.
- the LGW 30 selects and assigns the SGW 70 as a message destination to perform the bearer update of the extracted mobile terminals 10a and 10c (step S2211: SGW selection).
- SGW selection the SGW 70 is used. That is, the LGW 30 may omit the “SGW selection” process.
- the LGW 30 may select the SGW 70 that has already been allocated in the “SGW selection” process.
- the LGW 30 may perform the “SGW selection” process instead of the “SGW selection” process by the UE-MME 60.
- the LGW 30 may transmit a message instructing the UE-MME 60 to perform the “SGW selection” process via a PCRF (Policy and Charging Rules Function) that is a core network device (not shown).
- PCRF Policy and Charging Rules Function
- the UE-MME 60 can utilize the already installed SGW selection function, and can reduce the LGW apparatus cost.
- Information about the SGW 70 selected by the UE-MME 60 (for example, a contact address) is notified to the LGW 30 via the PCRF.
- the UE-MME 60 may perform subsequent bearer correction processing.
- the LGW 30 that has determined the SGW 70 to be a relay gateway when switching the LIPA connection to the RIPA connection transmits a bearer modification request message to the SGW 70 (step S2213: bearer modification request).
- the LGW 30 may issue a bearer modification request message for each bearer.
- the LGW 30 may issue a bearer modification request message for each mobile terminal or for each PDN connection / PDP context. Furthermore, the LGW 30 may issue a bearer modification request message to all the bearers at once, thereby enabling the LGW 30 to reduce signaling traffic.
- the SGW 70 generates bearer contexts of the mobile terminals 10a (active mode) and 10c (idle mode) that are the targets of the bearer modification request, and transmits a bearer modification request message to the UE-MME 60 (step S2215: bearer modification request). ).
- the UE-MME 60 updates the bearer context of the mobile terminals 10a and 10c held by the UE-MME 60 based on the received bearer modification request message (for example, updates the contact address of the SGW), and the mobile terminals 10a and 10c.
- the active mode or the idle mode is detected from the state recorded in the context.
- the UE-MME 60 transmits a bearer modification request to the mobile base station 20 only in the active mode UE 10a (Step S2217: Bearer modification request (active UE only)).
- the UE-MME 60 transmits a bearer modification request message for the bearer of the active mode UE 10a to the mobile base station 20, and does not transmit a bearer modification request message for the bearer of the idle mode UE 10c to the mobile base station 20. Thereby, UE-MME 60 can continue the idle mode of the mobile terminal 10c, and can reduce the battery consumption of the mobile terminal 10c.
- the mobile base station 20 performs a bearer modification process for updating a radio bearer (particularly, a QoS parameter) of the mobile terminal 10a in the active mode based on the received bearer modification response message (step S2219: bearer modification process).
- a bearer modification process for updating a radio bearer (particularly, a QoS parameter) of the mobile terminal 10a in the active mode based on the received bearer modification response message (step S2219: bearer modification process).
- the mobile base station 20 transmits a bearer modification response message to the UE-MME 60 (step S2221: bearer modification response).
- the UE-MME 60 transmits a bearer modification response including the state of the mobile terminals 10a and 10c (idle mode and active mode) and other context information to the SGW 70, and the context information received by the SGW 70 in its own context data. Reflect (Step S2223: Bearer modification response).
- the UE-MME 60 is a mobile base station for updating the S1 bearer of the active mode UE 10a (which is a bearer between the mobile base station 20 and the SGW 70 and forms a part of the UE bearer).
- Information such as 20 addresses and TEID is notified to the SGW 70, and the SGW 70 updates (corrects) the bearer context of the active mode UE 10a.
- Step S2225 Bearer modification response
- the LGW 30 updates its own context data to complete the bearer modification process.
- step S2227 service request process
- step S2229 Bearer correction processing
- FIG. 23 is a diagram for explaining the operation of the LGW 30 according to the third embodiment. Note that the configuration of LGW 30 in the present embodiment is the same as that of LGW 30 according to Embodiment 2 shown in FIG.
- the mobile base station communication unit 32 detects the departure of the mobile base station 20 from the local network via the local communication unit 34 (step S2301: detection of removal of the mobile base station).
- the switching processing unit 31 extracts the mobile terminals 10a and 10c that have established the LIPA connection via the mobile base station 20 (step S2303: target UE extraction). For example, when the mobile terminals 10a and 10c establish a LIPA connection, the LGW 30 via the local communication unit 34, the cell ID, base station ID, and CSG ID of the mobile base station 20 that accommodates the mobile terminals 10a and 10c. Collecting any (or a plurality of combinations) of location registration area IDs, etc., and targeting mobile terminals (UEs) that match any ID (or combination of multiple IDs) of the mobile base station 20 that detected the departure Mobile terminal (UE).
- UE departure Mobile terminal
- the switching processing unit 31 selects and assigns the SGW 70 that is the message destination in order to update the bearer of the extracted mobile terminals 10a and 10c (step S2305: SGW selection). In addition, when the SGW 70 is already assigned when the LIPA connection is established, the SGW 70 is used.
- the mobile base station communication unit 32 transmits a bearer modification request message to the SGW 70 serving as a relay gateway when switching the LIPA connection to the RIPA connection via the local communication unit 34 (step S2307: bearer modification request transmission).
- the mobile base station communication unit 32 receives the bearer modification response including the state of the mobile terminals 10a and 10c (idle mode and active mode) and other context information from the UE-MME 60 via the local communication unit 34 ( Step S2309: Bearer modification response reception). Then, the “bearer switching process” shown in FIG.
- UE-MME 60 “Bearer Modification Request Reception Processing” Flow (1)
- UE-MME 60 “Bearer Modification Request Reception Processing” Flow (1)
- Embodiment 3 The configuration of UE-MME 60 is the same as that of UE-MME 60 according to Embodiment 2 shown in FIG. Therefore, detailed description thereof is omitted.
- the MME processing unit 61 determines whether the bearer modification request message received from the SGW 70 is for the mobile terminal in the idle mode via the communication unit 63 (step S2401: Idle UE modification request?). If the bearer modification request message is for an idle mode mobile terminal (Yes), the process proceeds to Step S2405. If not (No), the process proceeds to Step S2403.
- the MME processing unit 61 When the bearer modification request message is not intended for the mobile terminal in the idle mode, the MME processing unit 61 performs a process of updating the contexts of the retained S1 bearer and S5 / S8 bearer (step S2403: S1 bearer update, and Step S2405: S5 / S8 bearer update).
- the MME processing unit 61 updates the context of the retained S5 / S8 bearer (step S2405: S5 / S8 bearer update). That is, the S1 bearer is not updated.
- the MME processing unit 61 transmits a bearer modification request message for the bearer of the active mode UE 10a to the mobile base station 20 in order to update the radio bearer of the active mode UE 10a (especially the QoS parameter) via the communication unit 63. To do. Then, the bearer modification request reception processing flow (1) ends.
- the MME processing unit 61 communicates with the LGW 30 via the core network device PCRF via the communication unit 63, and extracts the mobile terminals 10a and 10c with which the LIPA connection is established. To do. (Step S2431: target UE extraction).
- the MME processing unit 61 determines whether or not the extracted mobile terminals 10a and 10c are idle mode mobile terminals (step 2433: Idle UE?). If the extracted mobile terminals 10a and 10c are idle mode mobile terminals (in the case of Yes), the process proceeds to step S2437. If the extracted mobile terminals 10a and 10c are not idle mode mobile terminals, the process proceeds to step S2435. To do.
- the MME processing unit 61 updates the contexts of the retained S1 bearer and S5 / S8 bearer (step S2435: S1 bearer update, and steps S2437: S5). / S8 bearer update).
- the MME processing unit 61 updates the context of the retained S5 / S8 bearer (step S2437: S5 / S8 bearer update).
- the MME processing unit 61 transmits a bearer modification request message for the bearer of the active mode UE 10a to the mobile base station 20 in order to update the radio bearer of the active mode UE 10a (especially the QoS parameter) via the communication unit 63. (Step S2439). Then, the bearer modification request reception processing flow (2) ends.
- steps S2433 to S2437 are performed for all the extracted mobile terminals 10a and 10c.
- FIG. 25 is a diagram showing a communication system configuration according to Embodiment 4 of the present invention.
- the communication system shown in FIG. 25 is different from the communication system shown in FIG. 1 in that the mobile terminal 10a is an active mode UE among the mobile terminals 10a and 10c accommodated by the mobile base station 20, and the mobile terminal 10c. Is an idle mode UE.
- the second embodiment is the same as the first embodiment.
- the same reference numerals are given to the components common to FIG.
- the mobile base station 20 is directly connected to the local network 110. Further, the mobile terminals 10 a and 10 c are LIPA connected to the local network 110 via the mobile base station 20 and the LGW 30.
- the UE-MME 60 is connected to the core network 140 and performs the status and mobility management of the mobile terminals 10a and 10c.
- the mobile terminal 10a in the active mode may be referred to as the active mode UE 10a
- the mobile terminal 10c in the idle mode may be referred to as the idle mode UE 10c.
- FIG. 26 is a diagram illustrating one state of the communication system according to the fourth embodiment.
- the communication system shown in FIG. 26 is different from the communication system shown in FIG. 2 in that the active mode UE 10a and the idle mode UE 10c are mixed. Except for this point, the second embodiment is the same as the first embodiment, and in FIG. 26, the same reference numerals are given to the components common to FIG.
- FIG. FIG. 27 is a connection sequence diagram of mobile terminals 10a and 10c according to Embodiment 4.
- the mobile base station 20 prior to connecting the mobile terminals 10a and 10c, the mobile base station 20 ensures connectivity to the core network 140 via the local network 110 and the provider network 120 (step S2701: core). Connection to NW is completed). Specifically, the mobile base station 20 establishes a secure connection to the core network 140 using a protocol such as PPPoE.
- the mobile terminal 10a starts connection processing.
- the mobile terminal 10a transmits a connection request to the mobile base station 20
- the mobile base station 20 transfers the connection request to the UE-MME 60
- processing is performed based on the initial connection procedure disclosed in TR23.829.
- a communication connection for example, a PDN connection or a PDP context
- S2705 connection establishment
- the mobile terminal 10c establishes a communication connection for LIPA between the mobile terminal 10c and the LGW 30 (steps S2706 to S2708: connection processing, S2709; connection establishment).
- step S2710 transition to the idle mode.
- FIG. 28 is a switching sequence diagram of local network connection according to the fourth embodiment.
- the local RAN 100 including the mobile base station 20 and the mobile terminals 10a and 10c has moved and is accommodated in the macro eNB 40. Shows the switching sequence of local network connection.
- the mobile base station 20 switches the backhaul to a cellular line (step S2801: backhaul switching), and establishes a connection with the macro eNB 40 and the RN-MME 50 (steps S2802 and S2803).
- step S2804 connection establishment).
- the mobile base station 20 releases the bearers (all bearers such as EPS bearer, PDN connection, PDP context, radio bearer) established by the subordinate mobile terminals 10a and 10c. Is sent to the UE-MME 60 (step S2806: bearer release instruction).
- bearer release instruction cell ID, base station ID, CSG ID, location registration area ID (for example, Tracking Area ID, Location Area ID, Routing Area ID) are used as identification information for identifying the mobile base station 20. ) (Or a plurality of combinations).
- the UE-MME 60 extracts the mobile terminals 10 a and 10 c that have established the LIPA connection via the mobile base station 20 based on the identification information for identifying the mobile base station 20 included in the bearer release instruction message. For example, when the mobile terminals 10a and 10c establish a LIPA connection, one of the cell ID, base station ID, CSG ID, and location registration ID of the mobile base station 20 that accommodates the mobile terminals 10a and 10c (or a plurality of registration IDs) The UE-MME 60 collects the combination), and extracts the mobile terminals 10a and 10c that have established the LIPA connection from the mobile base station 20 that matches the identifier included in the bearer release instruction message received from the mobile base station 20.
- the UE-MME 60 uses the cell ID, base station ID, CSG ID, location registration ID, etc. of the mobile base station 20 that accommodates the mobile terminals 10a and 10c (or a combination thereof) as the UE-MME 60. May be included in a message transmitted from the mobile terminals 10a and 10c to the UE-MME 60, or may be included in a message transmitted from the mobile base station 20 to the UE-MME 60.
- the UE-MME 60 transmits a bearer deletion instruction for the LIPA connection established by the extracted mobile terminals 10a and 10c to the LGW 30 (step S2807: bearer deletion instruction).
- the UE-MME 60 may issue a bearer modification request message for each bearer.
- the UE-MME 60 may issue a bearer modification request message for each mobile terminal or for each PDN connection / PDP context.
- the UE-MME 60 may collectively issue a bearer modification request message to all bearers, whereby the UE-MME 60 can reduce signaling traffic.
- the LGW 30 releases the context for the instructed bearer, and transmits a bearer deletion request to the UE-MME 60 (step S2808: bearer deletion request).
- UE-MME 60 transmits a bearer deletion request to mobile base station 20 (step S2809: bearer deletion request).
- the mobile base station 20 performs bearer release processing for the designated bearer on the mobile terminals 10a and 10c (steps S2810 and S2811: bearer release processing).
- the target bearers are the bearers of the mobile terminals 10a and 10c accommodated by the mobile base station 20 previously extracted by the UE-MME 60, including the bearers of the active mode UE 10a and the idle mode UE 10c. , Subject to bearer release processing.
- the mobile base station 20 transmits a bearer deletion response message to the UE-MME 60 (step S2812).
- UE-MME 60 releases the bearer context of interest and transmits a bearer deletion response message to LGW 30 (step S2813: bearer deletion response), and completes the bearer release process.
- step S2813 bearer deletion response
- the SGW 70 is assigned to the LIPA connection of the mobile terminals 10a and 10c, the SGW 70 is also involved in the bearer deletion process between the UE-MME 60 and the LGW 30.
- the mobile terminals 10a and 10c that have released the bearers constituting the LIPA connection perform reconnection processing (steps S2817 and S2818: connection processing).
- the mobile terminals 10a and 10c specify the access point name (APN) for LIPA and perform reconnection.
- APN access point name
- the mobile base station 20 Upon receiving the reconnection from the mobile terminals 10a and 10c, the mobile base station 20 rewrites (1) the access point name (APN) for RIPA (2) or the RIPA in the connection request message from the mobile terminals 10a and 10c.
- Information for instructing switching to an access point name (APN) for use for example, access point name (APN) for RIPA and switching instruction flag, or access point name (APN) for RIPA only
- UE -MME 60 continues the reconnection process of the mobile terminals 10a and 10c.
- the UE-MME 60 selects and assigns the connection to the RIPA APN, that is, the SGW 70 for connection to the LGW 30, and establishes the RIPA connection (steps S2819 and S2820: connection establishment).
- the mobile base station 20 may notify the access point name (APN) for RIPA in the bearer release process, and information that prompts connection to the access point name (APN) for RIPA (for example, a flag) May be notified to the mobile terminals 10a and 10c.
- the mobile terminals 10a and 10c specify the access point name (APN) for RIPA and perform the reconnection process.
- the mobile base station 20 (1) checks connection request messages from the mobile terminals 10a and 10c one by one and replaces them with the access point name (APN) for RIPA, or (2) the access point name for RIPA. It is possible to reduce the burden of instructing the UE-MME 60 to switch to (APN). This is an effective means for reducing the load particularly in the communication system according to the present embodiment in which a plurality of mobile terminals (UEs) are accommodated.
- FIG. 29A is a “UE connection process” flowchart of the mobile base station 20 according to Embodiment 4, and particularly shows a connection process to the local network by the mobile terminal (UE).
- FIG. 29B is a “bearer switching process” flowchart of the mobile base station 20 according to the fourth embodiment, and particularly shows bearer switching of the mobile terminal (UE).
- the configuration of mobile base station 20 according to the present embodiment is the same as the configuration of mobile base station according to Embodiment 1 shown in FIG.
- step S2901 connection request reception
- the base station processing unit 25 notifies the switching processing unit 26 accordingly.
- the switching processing unit 26 selects a connection destination based on the backhaul media (Backhaul Media) used when the notification is received from the base station processing unit 25 (step S2903: connection destination selection). That is, when the backhaul media is the local communication unit 21, the switching processing unit 26 selects local IP access (LIPA). When the backhaul media (Backhaul Media) is the cellular communication unit (core network) 22, the switching processing unit 26 selects remote access (RIPA) to the local network.
- backhaul media Backhaul Media
- the switching processing unit 26 selects remote access (RIPA) to the local network.
- the access point name (APN) corresponding to the selected connection destination the access point name (APN) for LIPA or the access point name (APN) for RIPA) is the connection request message of the mobile terminals 10a and 10c. (Or overwritten with the access point name (APN) described in the connection request message), and via the base station processing unit 25 and backhaul media (cellular communication unit (core network) 22 or local communication unit 21). And transferred to the UE-MME 60 (step S2905: connection transfer request). Thereafter, the base station processing unit 25 performs an operation necessary for the connection processing of the mobile terminal (UE) such as processing a message received from each communication unit (step S2907: execution of subsequent connection processing).
- the switching processing unit 26 detects that the backhaul media (Backhaul Media) is switched (or needs to be switched) (step S2931: back). (Howl switching detection), the switching processing unit 26, as a processing mode of the base station processing unit 25, one of a mode operating as a femto base station and a mode operating as a relay node (2) And is applied to the base station processing unit 25 (step S2933: change processing mode).
- the switching processing unit 26 instructs the base station processing unit 25 to transmit a bearer modification request message via the cellular communication unit (core network) 22 or the local communication unit 21.
- the switching processing unit 26 instructs the base station processing unit 25 to transmit a bearer release instruction via the cellular communication unit (core network) 22, the local communication unit 21, or the cellular communication unit (UE) 23.
- Step S2935 Bearer release instruction (target CSG designation)).
- the base station processing unit 25 performs operations necessary for update processing and release processing for the bearers of the mobile terminals 10a and 10c, such as processing messages received from the respective communication units (step S2937: execution of subsequent processing).
- FIG. 30 is a diagram for explaining the operation of UE-MME 60 according to the fourth embodiment.
- the configuration of UE-MME 60 according to the present embodiment is the same as the configuration of UE-MME 60 according to Embodiment 2, and a detailed description thereof will be omitted.
- the MME processing unit 61 moves through the communication unit 63 based on the identification information for identifying the mobile base station 20 included in the bearer release instruction message.
- the mobile terminals 10a and 10c that have established the LIPA connection are extracted via the base station 20 (step S3001: target UE extraction (UE connected to the designated CSG)).
- step S3003 bearer deletion response
- FIG. 31 is a diagram showing a communication system configuration according to the fifth embodiment.
- the communication system shown in FIG. 31 differs from the communication system shown in FIG. 1 in that the mobile terminal 10a is an active mode UE among the mobile terminals 10a and 10c accommodated by the mobile base station 20, and the mobile terminal 10c. Is an idle mode UE.
- the second embodiment is the same as the first embodiment, and in FIG. 31, the same reference numerals are given to the components common to FIG. 1.
- the mobile base station 20 is directly connected to the local network 110. Further, the mobile terminals 10 a and 10 c are LIPA connected to the local network 110 via the mobile base station 20 and the LGW 30.
- the UE-MME 60 is connected to the core network 140 and performs the status and mobility management of the mobile terminals 10a and 10c.
- the mobile terminal 10a in the active mode may be referred to as the active mode UE 10a
- the mobile terminal 10c in the idle mode may be referred to as the idle mode UE 10c.
- FIG. 32 is a diagram illustrating a state of the communication system according to the fifth embodiment.
- the communication base station 20 is disconnected from the local network 110 and connected to the macro eNB 40 of the macro RAN 130. Indicates one state.
- the communication system shown in FIG. 32 is different from the communication system shown in FIG. 2 in that active mode UE 10a and idle mode UE 10c are mixed. Except for this point, the second embodiment is the same as the first embodiment, and in FIG. 32, the same reference numerals are given to components common to those in FIG.
- FIG. 33 is a connection sequence diagram of mobile terminals 10a and 10c according to Embodiment 5.
- the mobile base station 20 secures connectivity to the core network 140 via the local network 110 and the provider network 120 (step S3301: core). Connection to NW is completed). Specifically, the mobile base station 20 establishes a secure connection to the core network 140 using a protocol such as PPPoE.
- the mobile terminal 10a starts connection processing.
- the mobile terminal 10a transmits a connection request to the mobile base station 20
- the mobile base station 20 transfers the connection request to the UE-MME 60
- processing is performed based on the initial connection procedure disclosed in TR23.829.
- Steps S3303 to S3305 connection processing
- a communication connection for example, a PDN connection or a PDP context
- the mobile terminal 10c establishes a communication connection for LIPA between the mobile terminal 10c and the LGW 30 (steps S3306 to S3308: connection processing).
- step S3310 transition to the idle mode.
- FIG. 34 is a local network connection switching sequence diagram according to the fifth embodiment.
- the local RAN 100 including the mobile base station 20 and the mobile terminals 10a and 10c moves and is accommodated in the macro eNB 40. Shows switching of local network connection.
- FIG. 34 is a sequence diagram illustrating a method for instructing bearer release.
- the mobile base station 20 detects the backhaul switching (step S3401: backhaul switching).
- the backhaul of the mobile base station 20 uses a wired LAN such as Ethernet (registered trademark) or a wireless LAN when connecting to the local network 110.
- the mobile base station 20 uses a cellular line when connecting to the macro RAN.
- it is detected that the backhaul of the mobile base station 20 has been switched from, for example, a wired LAN to a cellular line.
- the mobile base station 20 may detect that the backhaul of the mobile base station 20 has actually been switched. In addition, the mobile base station 20 may determine that the backhaul of the mobile base station 20 has been switched when the mobile base station 20 has received a signal instructing switching of the backhaul of the mobile base station 20.
- a signal instructing switching of the backhaul of the mobile base station 20 for example, a switching instruction signal input by a user through a screen, a button, or the like, a switching instruction signal input remotely, or the like can be considered.
- the mobile base station 20 determines that the backhaul of the mobile base station 20 has been switched when the connectivity of the backhaul media to be switched to is confirmed. For example, the mobile base station 20 can accurately switch backhaul media (Backhaul Media) while preventing erroneous detection.
- the mobile base station 20 Upon detecting backhaul switching to the cellular line, the mobile base station 20 performs connection processing with the RN-MME 50 via the macro eNB 40 (steps S3402, S3403: connection processing), and communication for accommodating UE traffic.
- a connection is established (step S3404: connection establishment).
- the detailed operation for establishing the communication connection can use, for example, a procedure as disclosed in TR36.806.
- step S3404 when the connection for accommodating the UE traffic is established, the mobile base station 20 sends a bearer modification request message for switching the LIPA connection established by the subordinate mobile terminals 10a and 10c to the RIPA connection in the UE-MME 60.
- Step S3405 Bearer modification request
- the bearer modification request message includes one (or a plurality of combinations) of a cell ID, a base station ID, a CSG ID, and a location registration area ID as information for identifying the mobile base station 20.
- the UE-MME 60 that has received the bearer modification request message extracts the mobile terminals 10 a and 10 c that have established the LIPA connection via the mobile base station 20. For example, when the mobile terminals 10a and 10c establish a LIPA connection, any one (or more) of the cell ID, base station ID, CSG ID, location registration area ID, etc. of the mobile base station 20 that accommodates the mobile terminals 10a and 10c
- the UE-MME 60 collects the mobile terminals 10a and 10c that have established the LIPA connection from the mobile base station 20 that matches the identifier included in the bearer modification request message received from the mobile base station 20. .
- the UE-MME 60 uses any one (or a plurality of combinations) of the cell ID, base station ID, CSG ID, location registration area ID, etc. of the mobile base station 20 that accommodates the mobile terminals 10a, 10c. May be included in a message transmitted from the mobile terminals 10a and 10c to the UE-MME 60, or may be included in a message transmitted from the mobile base station 20 to the UE-MME 60.
- the mobile base station 20 instructs the bearer modification request message to switch the connection destination of the target bearer from the access point name (APN) for LIPA to the access point name (APN) for RIPA.
- APN access point name
- RIPA access point name
- an access point name (APN) for RIPA may be added to the message, or information (for example, a flag) that explicitly instructs APN switching may be added.
- the mobile base station 20 may issue a bearer modification request message for each bearer. Further, the mobile base station 20 may issue a bearer modification request message for each mobile terminal or for each PDN connection / PDP context. Furthermore, the mobile base station 20 may issue a bearer modification request message to all bearers at once, whereby the mobile base station 20 can reduce signaling traffic.
- the UE-MME 60 that has received the bearer modification request selects and assigns the SGW 70 to connect to the access point name (APN) for RIPA (step S3407: SGW selection), and adds the contact address of the LGW 30 and the like.
- a bearer modification request message is transmitted to the SGW 70 (step S3409: bearer modification request).
- the SGW 70 that has received the message generates a bearer contest for the target mobile terminals 10a and 10c, and transfers a bearer modification request message to the LGW 30. Then, bearer context modification processing such as modifying the bearer context of the mobile terminals 10a and 10c targeted by the LGW 30 (for example, the contact address of the SGW) and transmitting a bearer modification response message to the SGW 70 is performed (step S3411: Bearer correction processing).
- the SGW 70 When the SGW 70 completes the generation / update of the bearer context, the SGW 70 transmits a bearer modification response message to the UE-MME 60 (step S3413: bearer modification response).
- the UE-MME 60 detects either the active mode or the idle mode from the state recorded in the context of the target mobile terminals UE10a, 10c. Then, the UE-MME 60 performs a bearer modification response message to the mobile base station 20 only in the active mode (step S3415: bearer modification request (active UE only)). That is, the UE-MME 60 transmits a bearer modification request message for the bearer of the active mode UE 10a to the mobile base station 20, and does not transmit a bearer modification request message for the bearer of the idle mode UE 10c to the mobile base station 20. Thereby, UE-MME 60 can continue the idle mode of the mobile terminal 10c, and can reduce the battery consumption of the mobile terminal 10c.
- the mobile base station 20 Based on the received bearer modification response message, the mobile base station 20 performs a bearer modification process for updating the radio bearer (particularly the QoS parameter) of the mobile terminal 10a in the active mode (step S3417: bearer modification process).
- step S3419 service request process
- step S3421 Bearer correction processing
- FIG. 35 (a) is a “UE connection process” flow diagram of mobile base station 20 according to Embodiment 5
- FIG. 35 (b) is a “bearer switching process” of mobile base station 20 according to Embodiment 5. It is a flow diagram.
- step S3501 reception of connection request.
- the base station processing unit 25 notifies the switching processing unit 26 accordingly.
- the switching processing unit 26 selects a connection destination based on the backhaul media (Backhaul Media) used when the notification is received from the base station processing unit 25 (step S3503: connection destination selection). That is, when the backhaul media is the local communication unit 21, the switching processing unit 26 selects local IP access (LIPA). When the backhaul media (Backhaul Media) is the cellular communication unit (core network) 22, the switching processing unit 26 selects remote access (RIPA) to the local network.
- backhaul media Backhaul Media
- the switching processing unit 26 selects remote access (RIPA) to the local network.
- the access point name (APN) corresponding to the selected connection destination the access point name (APN) for LIPA or the access point name (APN) for RIPA) is the connection request message of the mobile terminals 10a and 10b. (Or overwritten with the access point name (APN) described in the connection request message), and via the base station processing unit 25 and backhaul media (cellular communication unit (core network) 22 or local communication unit 21). And transferred to the UE-MME 60 (step S3505: connection transfer request). Thereafter, the base station processing unit 25 performs an operation necessary for the connection process of the mobile terminal (UE) such as processing a message received from each communication unit (step S3507: execution of subsequent connection process).
- the switching processing unit 26 detects that backhaul media has been switched (or needs to be switched) (step S3531: back). (Howl switching detection), the switching processing unit 26, as a processing mode of the base station processing unit 25, one of a mode operating as a femto base station and a mode operating as a relay node (2) Is applied to the base station processing unit 25 (step S3533: processing mode change).
- the switching processing unit 26 instructs the base station processing unit 25 to transmit a bearer modification request message via the cellular communication unit (core network) 22 or the local communication unit 21.
- the switching processing unit 26 instructs the base station processing unit 25 to transmit a bearer release instruction via the cellular communication unit (core network) 22, the local communication unit 21, or the cellular communication unit (UE) 23.
- Step S3535 Bearer modification request instruction.
- the base station processing unit 25 performs operations necessary for update processing and release processing for the bearers of the mobile terminals 10a and 10b, such as processing messages received from the respective communication units (step S3537: execution of subsequent processing).
- FIG. 36 is a diagram for explaining the operation of UE-MME 60 according to the present embodiment.
- the MME processing unit 61 extracts the mobile terminals 10a and 10c in which the LIPA connection is established via the mobile base station 20 via the communication unit 63. (Step S3601: target UE extraction).
- the MME processing unit 61 determines whether or not the extracted mobile terminals 10a and 10c are idle mode mobile terminals (step 3603: Idle UE?). If the extracted mobile terminals 10a and 10c are idle mode mobile terminals (in the case of Yes), the process proceeds to step S3607. If the extracted mobile terminals 10a and 10c are not idle mode mobile terminals, the process proceeds to step S3605. To do.
- the MME processing unit 61 updates the contexts of the retained S1 bearer and S5 / S8 bearer (step S3605: S1 bearer update, and steps S3607: S5). / S8 bearer update).
- the MME processing unit 61 updates the context of the retained S5 / S8 bearer (step S3607: S5 / S8 bearer update). That is, the context update of the S1 bearer is not performed.
- the MME processing unit 61 transmits a bearer modification response message for the bearer of the active mode UE 10a to the mobile base station 20 to update the radio bearer of the active mode UE 10a (especially QoS parameters) via the communication unit 63.
- Step S3609 Bearer modification response transmission).
- steps S3603 to S3607 are performed on all the extracted mobile terminals 10a and 10c.
- the bearer correction process (especially the S1 bearer correction)
- the mobile terminal (UE) or UE-MME is instructed to start the bearer modification process.
- the SGW and the S1 bearer context of the mobile base station 20 are updated as necessary (mobile base station address / TEID, SGW address / TEID, etc. are updated).
- non-GPRS public wireless access systems such as 3GPP2, WiMAX, and WLAN
- public wired access systems via Ethernet registered trademark
- dial-up public-up
- FIG. 37 is a diagram showing a configuration of a communication system including a public access system 3700 configured by technologies such as WiMAX, WLAN, 3GPP2, and Ethernet (registered trademark).
- a communication system that targets 3GPP SAE / LTE for example, the system shown in FIG. 2 is that it has a public access system 3700 and a security gateway for connecting to the core network 140 via the public access system 3700 ( SeGW) 3800 is arranged in the core network 140.
- SeGW public access system 3700
- the macro RAN 130 is omitted from the configuration diagram, but the macro RAN 130 and an entity of the core network 140 (for example, RN-MME 50) that accommodates the macro RAN 130 may be included.
- FIG. 38 is a diagram for explaining the operation of the communication system shown in FIG.
- the mobile base station 1020 detects a connectable public access in the detection of the backhaul switching (performed by detecting the corresponding frequency, detecting the connection possibility via the broadcast channel, etc.) (step S5001: backhaul switching)
- a mode that operates as a femto base station that performs remote access to the local network via public access is selected, and connection processing to public access is performed (step S5003: connection processing).
- a secure connection is established with the security gateway (SeGW) 3800 (step S5005: connection establishment).
- the secure connection can use an L2 tunnel or an IPsec tunnel.
- the mobile base station 1020 completes preparation for switching the LIPA connection to the local network of the subordinate mobile terminals 10a and 10b to the RIPA connection, and bearer release processing and bearer correction processing as described in the previous embodiment. Is issued to switch the LIPA connection to the RIPA connection.
- FIG. 39 is a diagram for explaining the configuration of mobile base station 1020 in the communication system shown in FIG. 37. The difference from the configuration of the mobile base station shown so far is that public access communication unit 1027 is provided. It is. For simplicity of explanation, the cellular communication unit (core network) 22 for connecting to the macro RAN 130 is omitted, but it may also be included.
- FIG. 40 is a flowchart for explaining bearer switching processing of the mobile base station 1020 shown in FIG.
- a public access system composed of technologies such as WiMAX, WLAN, 3GPP2 is detected based on information from the local communication unit 21 and the public access communication unit 1027 (step S4001: backhaul switching detection)
- the switching processing unit 26 A mode that operates as a femto base station that performs remote access to the local network via public access is selected and applied to the base station processing unit 25 (step S4003: processing mode change).
- the base station processing unit 25 connects to the public access system 3700, establishes a security connection with the SeGW 3800, and constructs a connection path to the core network 140.
- the base station is selected by selecting one of the following modes according to the type of backhaul to be connected. This is applied to the station processing unit 25.
- LIPA local access
- RIPA remote access
- Verification of whether it is possible to connect directly to the local network from public access is performed by the following method, for example. That is, the subnet constituting the local network is stored and connected to the same subnet via public access, or the communication confirmation with the LGW (for example, the communication confirmation using ping) after connecting to the network (before establishing connection with the SeGW)
- the access point or router address (MAC address, IP address, etc.) is stored in advance or dynamically acquired, and is the same as the access point or router address connected for public access. If an identifier (SSID, etc.) used when connecting to the local network is stored in advance and it is detected that the identifier is the same as the identifier used when connecting to public access , Directly from public access to local network It is determined that it is possible to continue.
- the switching processing unit 26 selects a mode that operates as a femto base station that performs local access (LIPA) in the processing mode change step.
- LIPA local access
- the public access communication unit 1027 may be integrated with the local communication unit 21 in the configuration of the mobile base station for verifying whether it is possible to directly connect to the local network from public access.
- step S4005 (bearer modification request or bearer release instruction) and step S4007 (subsequent processing execution) are performed in the same manner as described above.
- each functional block used in the description of each of the above embodiments is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them. Although referred to as LSI here, it may be referred to as IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
- the method of circuit integration is not limited to LSI, and implementation with a dedicated circuit or a general-purpose processor is also possible.
- An FPGA Field Programmable Gate Array
- a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
- the communication system, the communication method, the mobile terminal, and the mobile base station apparatus according to the present invention have an effect of appropriately establishing a connection path to the local network of the mobile terminal according to the connection form of the mobile base station. It is useful as a communication method, a mobile terminal, a mobile base station apparatus and the like.
- Wireless communication unit 10a, 10b, 10c Mobile terminal 11 Wireless communication unit 12 Communication processing unit 13 Application section 20 Mobile base stations 21 Local Communication Department 22 Cellular communication unit (core network) 23 Cellular communication unit (UE) 24 LGW Communication Department 25 Base station processor 26 Switching processor 30 LGW 31 switching processing unit 32 mobile base station communication unit 33 LGW processing unit 34 local communication unit 40 macro eNB 50 RN-MME 60 UE-MME 61 MME processing unit 63 communication unit 70 SGW 100 local RAN 110 Local network 120 Provider network 130 Macro RAN 140 Core network of operators
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Abstract
Description
本実施の形態に係る通信システムでは、リレーノードとして機能する移動基地局が、移動基地局のバックハウル(Backhaul)が変更されたことで、移動端末が移動したことを検出し、そのタイミングで、移動端末のLIPAコネクションを切断して再接続を促し、バックハウルメディア(Backhaul Media)の種別に応じて、再接続時の経路を正しく制御する。そのため、本実施の形態に係る通信システムによれば、移動基地局の接続形態に応じて移動端末のローカルネットワークへの接続経路を直接接続かリモート接続のいずれかに切り替え、移動端末の最適な通信経路を確立させることができる。
図1は、本発明の実施の形態1に係る通信システムの構成を示す図である。図1に示す通信システムは、ローカルRAN 100に接続する複数の移動端末(UE)10a、10b(以下、移動端末10a、10bと呼ぶ)と、ローカルRAN 100を形成する移動基地局20と、移動基地局20を経由して、ローカルネットワーク110にLIPA接続する際のゲートウェイとして機能するローカルゲートウェイ(Local Gateway;LGW)30(以下、LGW 30と呼ぶ)と、マクロRAN 130に接続されるマクロ基地局eNB 40(以下、マクロeNB 40と呼ぶ)と、コアネットワーク140に接続するUE-MME 60と、コアネットワーク140に接続するサービングゲートウェイ(Serving GateWay;SGW)70(以下、SGW 70と呼ぶ)と、ローカルRAN 100と、ローカルネットワーク110と、プロバイダネットワーク120と、マクロRAN 130と、オペレータのコアネットワーク140と、を含む。なお、図1に示していないが、コアネットワーク140内に、リレーノードのモビリティ・マネジメント・エンティティ(Mobility Management Entity; MME)であるRN-MME 50が含まれる(図2参照)。
なお、実施の形態1に係る通信システムでは、全ての移動端末10a、10bがアクティブモードであることを想定している。
図1、図2に示す通信システムに関する動作について、図3から図5を用いて説明する。図3は、図1に示す通信システムの構成における移動端末10a、10bの接続シーケンスを示す図である。図4は、ベアラリリース指示を説明するシーケンス図(1)である。図5は、ベアラ修正指示を説明するシーケンス図(1)である。
次に移動基地局20の構成について図6を用いて説明する。図6は、実施の形態1に係る移動基地局20の構成を示すブロック図である。図6に示す移動基地局20は、ローカルネットワーク110との通信を制御するローカル通信部21と、マクロRAN 130のマクロeNB 40との通信を制御するセルラ通信部(コア網)22と、収容する移動端末10a、10bとの通信を制御するセルラ通信部(UE)23と、ローカル通信部21を介してLGW 30との通信を制御するLGW通信部24と、すべての通信部(ローカル通信部21、セルラ通信部(コア網)22、セルラ通信部(UE)23、及びLGW通信部24)を介して、移動端末10a、10bを収容するための処理を実施する基地局処理部25と、接続切替処理を実施する切替処理部26と、を備える。ここでローカル通信部21は、例えば有線LANや無線LAN等の通信リンクに接続するための通信インタフェース(通信デバイス)に相当する。
次に、移動端末10a、10bの構成について図8を用いて説明する。図8は、移動端末10a、10bの構成を示すブロック図である。移動端末10a、10bの構成は同じであるため、便宜上、図8では移動端末10a(又は10b)と表記する。
実施の形態1に係る通信システムでは、全ての移動端末(UE)がアクティブモードであることを想定したものであった。しかしながら、移動基地局の配下の移動端末(UE)がアイドルモードである場合、移動基地局には、アイドルモードUE(Idle mode User Equipment(UE))のコンテキストが存在しないため、移動基地局はベアラリリースやベアラ修正処理を実施することができない。したがって、実施の形態2に係る通信システムでは、LGWが保持するUEコンテキストに基づいてアイドルモードUEが特定され、アイドルモードUEのコネクションの切り替えをアクティブモードUEの切り替えと同じタイミングで実施される。そのため、本実施の形態に係る通信システムによれば、移動基地局の接続形態に応じて移動端末のローカルネットワークへの接続経路を直接接続かリモート接続のいずれかに切り替え、移動端末の最適な通信経路を確立させることができる。
図10は、本発明による実施の形態2に係る通信システム構成を示す図である。ここで、図10に示す通信システムが、図1に示す通信システムと異なる点は、移動基地局20が収容する移動端末10a、10cのうち、移動端末10aはアクティブモードUEであり、移動端末10cはアイドルモードUEである。この点以外は実施の形態1と同様であり、図10において、図1と共通する構成要素には同じ参照符号が付されている。
図10、図11に示す通信システムの動作について、図12及び図13を用いて説明する。図12は、図10に示す通信システムの構成における移動端末10a、10cの接続シーケンスを示す図である。
本実施の移動基地局20の動作について、図14(a)、(b)を用いて説明する。なお、本実施の形態における移動基地局20の構成は、図6に示す移動基地局の構成と同じであるため、その説明を割愛する。図14(a)は、実施の形態2に係る移動基地局20の「UE接続処理」フロー図であり、図14(b)は、実施の形態2に係る移動基地局20の「ベアラ切替処理」フロー図である。
本実施の形態におけるLGW 30の構成について図15を用いて説明する。図15は、実施の形態2に係るLGW 30の構成を示すブロック図である。図15に示すLGW 30は、ローカルネットワーク110への接続切替を実施するための切替処理部31と、ローカルネットワーク110を介して移動基地局20とセキュアに通信するための移動基地局通信部32と、ローカルネットワーク110に接続する移動基地局20やコアネットワーク装置に対してLGW処理を実行するLGW処理部33と、ローカルネットワーク110との通信を制御するローカル通信部34と、を備える。
次に、実施の形態2に係るUE-MME 60の構成について図17を用いて説明する。図17は、実施の形態2に係るUE-MME 60の構成を示すブロック図である。図17に示すUE-MME 60は、MME処理を実施するためのMME処理部61と、移動基地局20やSGW 70などのコアネットワーク装置とメッセージの送受信を行うための通信部63と、を備える。
実施の形態3に係る通信システムでは、LGW 30が移動基地局20の移動を検出し、移動基地局20が収容する移動端末(UE)のLIPAコネクションをRIPAコネクションに切り替える方法について説明する。本実施の形態に係る通信システムによれば、移動基地局の接続形態に応じて移動端末のローカルネットワークへの接続経路を直接接続かリモート接続のいずれかに切り替え、移動端末の最適な通信経路を確立させることができる。
図19は、実施の形態3に係る通信システム構成を示す図である。ここで、図19に示す通信システムが、図1に示す通信システムと異なる点は、移動基地局20が収容する移動端末10a、10cのうち、移動端末10aはアクティブモードUEであり、移動端末10cは、アイドルモードUEである。この点以外は実施の形態1と同様であり、図19において、図1と共通する構成要素には同じ参照符号が付されている。
図19、図20に示す通信システムの動作について、図21及び図22を用いて説明する。図21は、実施の形態3に係る移動端末10a、10cの接続シーケンス図である。
次に実施の形態3に係るLGW 30の動作について、図23を用いて説明する。図23は、実施の形態3に係るLGW 30の動作を説明するための図である。なお、本実施の形態におけるLGW 30の構成は、図15に示す実施の形態2に係るLGW 30と同じ構成であるため、その詳細な説明を省略する。
次に本実施の形態におけるUE-MME 60の動作について、図24(a)、(b)を用いて説明する。実施の形態3に係るUE-MME 60の「ベアラ修正要求受信処理」フロー(1)なお、UE-MME 60の構成は、図17に示す実施の形態2に係るUE-MME 60と同じ構成であるため、その詳細な説明を省略する。
実施の形態4に係る通信システムでは、移動基地局20が、バックハウル(Backhaul)の切替を検出した時にCSG IDやセルID、基地局ID、位置登録エリアIDなどの移動基地局20に関する情報(移動基地局20を特定する情報)を通知し、UE-MME 60が、切替対象となる移動端末(UE)を検出し、移動端末10a、10cにRIPAコネクションへの再接続を実施させる。そのため、本実施の形態に係る通信システムによれば、移動基地局の接続形態に応じて移動端末のローカルネットワークへの接続経路を直接接続かリモート接続のいずれかに切り替え、移動端末の最適な通信経路を確立させることができる。
図25は、本発明による実施の形態4に係る通信システム構成を示す図である。ここで、図25に示す通信システムが、図1に示す通信システムと異なる点は、移動基地局20が収容する移動端末10a、10cのうち、移動端末10aはアクティブモードUEであり、移動端末10cは、アイドルモードUEである。この点以外は実施の形態1と同様であり、図25において、図1と共通する構成要素には同じ参照符号が付されている。
図25、図26に示す通信システムの動作について、図27及び図28を用いて説明する。図27は実施の形態4に係る移動端末10a、10cの接続シーケンス図である。
本実施の形態に係る移動基地局20の動作について、図29(a)、(b)を用いて説明する。図29(a)は、実施の形態4に係る移動基地局20の「UE接続処理」フロー図であり、特に、移動端末(UE)によるローカルネットワークへの接続処理を示す。また、図29(b)は、実施の形態4に係る移動基地局20の「ベアラ切替処理」フロー図であり、特に、移動端末(UE)のベアラ切替を示す。なお、本実施の形態に係る移動基地局20の構成は、図6に示す実施の形態1に係る移動基地局の構成と同じであるため、その詳細な説明を省略する。
次に本実施の形態におけるUE-MME 60の動作について図30を用いて説明する。図30は、実施の形態4に係るUE-MME 60の動作を説明するための図である。本実施の形態に係るUE-MME 60の構成は、実施の形態2に係るUE-MME 60の構成と同じであり、その詳細な説明を省略する。
実施の形態5に係る通信システムでは、移動基地局20がバックハウル(Backhaul)の切替を検出した時に、CSG IDや基地局ID、セルID、位置登録エリアIDなど移動基地局20に関する情報を提供して、UE-MME 60が切替対象となる移動端末(UE)を検出し、移動端末(UE)のLIPAコネクションをRIPAコネクションに切り替える。そのため、本実施の形態に係る通信システムによれば、移動基地局の接続形態に応じて移動端末のローカルネットワークへの接続経路を直接接続かリモート接続のいずれかに切り替え、移動端末の最適な通信経路を確立させることができる。
図31は、実施の形態5に係る通信システム構成を示す図である。ここで、図31に示す通信システムが、図1に示す通信システムと異なる点は、移動基地局20が収容する移動端末10a、10cのうち、移動端末10aはアクティブモードUEであり、移動端末10cは、アイドルモードUEである。この点以外は実施の形態1と同様であり、図31において、図1と共通する構成要素には同じ参照符号が付されている。
図31、図32に示す通信システムの動作について、図33及び図34を用いて説明する。図33は、実施の形態5に係る移動端末10a、10cの接続シーケンス図である。
次に本実施の形態における移動基地局20の動作について図35を用いて説明する。なお、本実施の形態に係る移動基地局20の構成は、図6に示す実施の形態1に係る移動基地局20の構成と同じであるため、その詳細は説明を省略する。
次に、本実施の形態におけるUE-MME 60の構成は、図17に示す実施の形態2に係るUE-MME 60の構成と同じであるため、その詳細な説明を省略する。
1)ローカルネットワークへのローカルアクセス(LIPA)を実施するフェムト基地局として動作するモード(ローカル通信部21を介してローカルネットワーク110への接続が可能な場合)
2)ローカルネットワークへのリモートアクセス(RIPA)を実施するリレーノードとして動作するモード(セルラ通信部(コア網)22を有し、かつマクロRAN 130への接続が可能な場合)
3)公衆アクセス経由でローカルネットワークへのリモートアクセス(RIPA)を実施するフェムト基地局として動作するモード(公衆アクセス通信部1027を介して公衆アクセスシステム3700への接続が可能な場合)
なお、公衆アクセスからローカルネットワークに直接接続することができるかを検証するための移動基地局の構成において、公衆アクセス通信部1027をローカル通信部21と統合してもよい。
11 無線通信部
12 通信処理部
13 アプリ部
20 移動基地局
21 ローカル通信部
22 セルラ通信部(コア網)
23 セルラ通信部(UE)
24 LGW通信部
25 基地局処理部
26 切替処理部
30 LGW
31 切替処理部
32 移動基地局通信部
33 LGW処理部
34 ローカル通信部
40 マクロeNB
50 RN-MME
60 UE-MME
61 MME処理部
63 通信部
70 SGW
100 ローカルRAN
110 ローカルネットワーク
120 プロバイダネットワーク
130 マクロRAN
140 オペレータのコアネットワーク
Claims (8)
- 自装置が収容する移動端末からの接続要求を受ける基地局処理部と、
前記移動端末からの接続要求に基づき、自装置が接続するバックハウルメディアに応じて、前記移動端末のローカルネットワークへの接続をローカルIP接続又はリモートIP接続のいずれか一方に切り替える、切替処理部と、
を備える移動基地局装置。 - 請求項1に記載の移動基地局装置であって、
前記ローカルネットワークとの通信を制御する第1通信部と、
マクロ基地局との通信を制御する第2通信部と、
前記移動端末との通信を制御する第3通信部と、を備え、
前記基地局処理部が、前記第3通信部を介して、前記移動端末からの接続要求を受信すると、前記切替処理部は、前記バックハウルメディアが前記第1通信部の場合、前記移動端末のローカルネットワークへの接続を前記ローカルIP接続に切り替え、前記バックハウルメディアが前記第2通信部の場合、前記移動端末のローカルネットワークへの接続を前記リモートIP接続に切り替える、移動基地局装置。 - アクティブモードの移動端末とアイドルモードの移動端末を含む複数の移動端末を収容可能であり、ローカルネットワークと接続可能な移動基地局装置と、
コアネットワークに接続され、前記複数の移動端末の状態及び移動管理を行うMMEと、を備える通信システムであって、
前記移動基地局装置は、アクティブモードの前記移動端末の接続要求に基づき、自装置が接続するバックハウルメディアに応じて、前記移動端末のローカルネットワークへの接続をローカルIP接続又はリモートIP接続のいずれか一方に切り替え、
前記MMEは、ローカルゲートウェイにより抽出されたアイドルモードの前記移動端末のベアラ修正指示に基づき、アイドルモードの前記移動端末の状態及び移動管理する、
通信システム。 - アクティブモードの移動端末とアイドルモードの移動端末を含む複数の移動端末を収容可能であり、ローカルゲートウェイを介して、ローカルネットワークと接続可能な移動基地局装置と、
コアネットワークに接続され、前記複数の移動端末の状態及び移動管理を行うMMEと、を備える通信システムであって、
前記ローカルゲートウェイは、前記移動基地局装置からの応答受信に基づき、ローカルネットワークからの前記移動基地局装置の離脱を検出することで、当該移動基地局装置に収容される前記複数の移動端末を抽出し、当該抽出された複数の移動端末のベアラ修正要求を前記MMEに送信し、
前記MMEは、前記ローカルゲートウェイから受信した複数の移動端末のベアラ修正要求に基づき、アクティブモードの前記移動端末について、前記移動基地局装置へのベアラ修正要求を実施し、アイドルモードの前記移動端末について、前記移動基地局装置へのベアラ修正要求を実施しない、
通信システム。 - アクティブモードの移動端末とアイドルモードの移動端末を含む複数の移動端末を収容可能であり、ローカルネットワークと接続可能な移動基地局装置と、
コアネットワークに接続され、前記複数の移動端末の状態及び移動管理を行うMMEと、を備える通信システムであって、
前記移動基地局装置が、バックハウルメディアの切替を検出すると、収容されている前記複数の移動端末が確立するベアラリリース指示メッセージに含まれる自装置の識別情報を前記MMEに送信し、
前記MMEは、前記移動基地局装置の識別情報に基づき、ベアラを確立した前記複数の移動端末を抽出し、抽出された前記複数の移動端末の状態及び移動管理を行う、
通信システム。 - アクティブモードの移動端末とアイドルモードの移動端末を含む複数の移動端末を収容可能であり、ローカルネットワークと接続可能な移動基地局装置と、
コアネットワークに接続され、前記複数の移動端末の状態及び移動管理を行うMMEと、を備える通信システムであって、
前記移動基地局装置が、バックハウルメディアの切替を検出すると、前記複数の移動端末が確立するベアラ修正要求に含まれる自装置の識別情報を前記MMEに送信し、
前記MMEは、前記移動基地局装置の識別情報に基づき、ベアラを確立した前記複数の移動端末を抽出し、ローカルゲートウェイから受信した複数の移動端末のベアラ修正要求に基づき、アクティブモードの前記移動端末について、前記移動基地局装置へのベアラ修正要求を実施し、アイドルモードの前記移動端末について、前記移動基地局装置へのベアラ修正要求を実施しない、
通信システム。 - 移動基地局装置に接続するための処理を行う無線通信部と、
前記移動基地局装置を介した通信を制御する制御部と、
確立した通信コネクションにより通信を行うアプリケーションを動作させるアプリ部と、を備えた移動端末であって、
前記制御部は、前記無線通信部を介して受信した、バックハウルメディアの切替に基づき前記移動基地局装置からのベアラリリース指示に基づき、ローカルネットワークへの接続をローカルIP接続又はリモートIP接続のいずれか一方に切り替え、
前記アプリ部は、切り替えられたローカルIP接続又はリモートIP接続のいずれか一方の通信コネクションにより通信を行うアプリケーションを動作させる、
移動端末。 - 移動基地局装置に収容される移動端末のローカルネットワークへの接続を切り替えるための通信方法であって、前記ローカルネットワークへの接続要求を前記移動端末から前記移動基地局装置へ送信するステップと、
前記移動端末からの前記ローカルネットワークへの接続要求に基づき、前記移動基地局装置が接続するバックハウルメディアに応じて、前記移動端末のローカルネットワークへの接続をローカルIP接続又はリモートIP接続のいずれか一方に切り替えるステップと、
を備える通信方法。
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