CN102256329B

CN102256329B - A kind of method and apparatus realizing Route Selection

Info

Publication number: CN102256329B
Application number: CN201010179745.0A
Authority: CN
Inventors: 梁爽; 周娜; 王静
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2010-05-19
Filing date: 2010-05-19
Publication date: 2016-03-02
Anticipated expiration: 2030-05-19
Also published as: CN102256329A; WO2011143997A1

Abstract

The invention discloses a kind of method and apparatus realizing Route Selection, the wireless side network element that all will be able to access for subscriber equipment, obtain this wireless side net element information relevant to direct tunnel and local gateway information; According to obtained wireless side net element information and local gateway information, determine whether to use direct tunnel between described wireless side network element and local gateway.The present invention realizes the method and apparatus of Route Selection, can judge whether flexibly to need to set up direct tunnel for subscriber equipment according to contents such as the system informations in practical application scene, therefore, it is possible to significantly improve transfer of data flexibility, and also can ensure the high efficiency that data are transmitted as far as possible.

Description

A kind of method and apparatus realizing Route Selection

Technical field

The present invention relates to the communications field, be specifically related to a kind of method and apparatus realizing Route Selection.

Background technology

In order to keep 3-G (Generation Three mobile communication system) in the competitiveness of the communications field, for user provides the Mobile Communication Service that speed is faster, time delay is lower, more personalized, and reduce the operation cost of operator, 3GPP (3rdGenerationPartnershipProject, third generation partner program) standard operation group is just being devoted to the research of evolved packet system (EvolvedPacketSystem, EPS).Fig. 1 shows the structural representation of evolution grouping domain system, and as shown in Figure 1, whole EPS is divided into wireless access network and core net two parts.In the core network, contain home subscriber server (HomeSubscriberServer, HSS), Mobility Management Entity (MobilityManagementEntity, MME), Serving GPRS Support Node (ServingGPRSSupportNode, SGSN), policy charging rule function (PolicyandChargingRuleFunction, PCRF), gateway (ServingGateway, SGW), packet data gateway (PDNGateway, and packet data network (PacketDataNetwork PGW), packet data network) etc.Detailed functions below:

Home subscriber server, is the permanent storage place of user contracting data, is positioned at the home network that user contracts.

Mobility Management Entity, be the storage place of user contracting data in current network, be responsible for tracking under the Non-Access Stratum signaling management of terminal to network, the safety verification function of terminal, the mobile management of terminal, user's idle pulley and paging management function and bearer management.

SGSN is the business support point of GERAN and UTRAN user access core network network, function and Mobility Management Entity similar, be responsible for the location updating of user, paging management and bearer management etc.

Gateway is the gateway that core net arrives wireless system, is responsible for the data buffer storage under terminal to the user plane bearer, terminal idle mode of core net, can realizes the function of network side initiating business request, Lawful Interception and packet routing and forwarding capability; Gateway is responsible for the situation that counting user terminal uses wireless network, and produces the ticket that terminal uses wireless network, sends charging gateway to.

Packet data gateway, it is the gateway between evolution system and external packet data networks, be connected on internet and packet data network, be responsible for Internet protocol (InternetProtocol, the IP) address assignment, billing function, grouping packet filtering, policy control etc. of terminal.

Packet data network is the IP operation network of operator, this network by the core net of operator for user provides IP to serve.

Policy charging rule functional entity is the server being responsible for providing charging control, online diameter credit control, thresholding control, service quality (QualityofService, QoS) tactful aspect rule in evolution system.

Wireless access network, by evolution base station (E-UTRANNodeB, and 3G radio network controller (RadioNetworkControl eNB), RNC) form, the transmitting-receiving of primary responsibility wireless signal, by air interface and terminal contact, the Radio Resource, scheduling of resource, access control etc. of management air interface.

Above-mentioned SGSN is through upgrading, can support the S4 interface between gateway, and and adopts GTPv2 agreement to carry out intercommunication between mobility management unit.And for supporting the SGSN of 3G core net, the PS territory network architecture and Fig. 1 different.Now SGSN and MME adopts gn interface to be connected, and adopts GTPv1 protocol interconnection.SGSN is connected with gateway, but is connected to Gateway GPRS Support Node (GatewayGPRSSupportNode, GGSN) by gn interface, directly to carry out packet data network access.

Home eNodeB comprises common Home eNodeB (HomeNodeB, and the Home eNodeB (HomeeNodeN of evolution HNB), HeNB), it is small-sized, the lower powered base station of a class, dedicated resources as certain user is deployed in the private sites such as family, group, company or school, be mainly used in providing higher service rate for user and reducing the expense used required for high rate services, the covering simultaneously making up existing distributed cellular radio communication system is not enough.The advantage of Home eNodeB is economical, convenient, low-power output, plug and play, broadband access, use single-mode terminal etc.

Home eNodeB can be applied in 3G or LTE (LongTermEvolution, Long Term Evolution) mobile communications network.For the ease of managing Home eNodeB, introduce new network element in a network: femto gateway.The major function that femto gateway realizes is: the fail safe of checking Home eNodeB, carries out maintenance management to the operation of Home eNodeB, according to Carrier Requirements configuration and control Home eNodeB, is responsible for the data message of exchcange core net and Home eNodeB.Fig. 2 is 3G home base station network Organization Chart, and 3G Home eNodeB is connected to femto gateway by the Iuh interface of new definition, and femto gateway is provided to IuPS and the IuCs interface of core network packet-domain and circuit domain.For 3G network, femto gateway must shield the impact introduced on terminal and network side after Home eNodeB.For LTE network, femto gateway is optional, therefore has two kinds of connected modes between LTE femtocell and core net, and one is that Home eNodeB is directly connected with core network element, another kind is that Home eNodeB is connected with core network element by gateway, respectively as shown in Figure 3, Figure 4.For the scene of the introducing femto gateway shown in Fig. 4, femto gateway can not integrated user plane functions, directly sets up user face, can make the flattening of user face like this between Home eNodeB and core network user veil close, data transmission delay is reduced, as shown in Figure 5.

Home eNodeB, except supporting by except the access of mobile core network, can also support that local IP accesses.Home eNodeB possess local IP access capability and user contract allow local IP access condition under, this locality access of user to other IP devices of home network or internet can be realized.The shunting of Internet data service can be realized by local access function, to reduce core net load, and can not core net be passed through for the access of home network device, make transfer of data convenient and efficient.Local IP access function also can use on macrocellular, main application and Home eNodeB similar, be more be applied in local IP to access this scene of Internet, object reduces core net load.Fig. 6 gives the framework realizing above-mentioned local access function.Wherein, local access network closes the network being linked into external network (such as internet) as this locality, provides the functions such as address assignment, charging, grouping packet filtering, policy control.This network element as self-existent network element, also can combine deployment with existing base station from home or home base-station gateway as a logical block when actual deployment.Further, if this network element is as an independently network element existence, then both can be positioned at wireless side network, also can be positioned at core net.

Be connected in the process that customer location is moved to make this locality and still can keep continuous, expansion tunnel (ExtensionTunnel) can also be introduced.When UE initially connects, between wireless side network element and local gateway (LGW), direct tunnel is used to transmit data, to ensure the high efficiency that data are transmitted.Once the position of UE there occurs movement, then can not re-use direct tunnel between the wireless side network element that UE will access and LGW and transmit data, but continue to transmit data by expansion tunnel, thus the continuity of the business of guarantee.Obviously, above-mentioned UE is the fixing mode using expansion tunnel after position is moved, and lacks flexibility, and is unfavorable for the high efficiency that data are transmitted.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of method and apparatus realizing Route Selection, to improve transfer of data flexibility, ensures the high efficiency that data are transmitted as far as possible.

For achieving the above object, technical scheme of the present invention is achieved in that

Realize a method for Route Selection, the method comprises:

For the wireless side network element that UE will access, obtain this wireless side net element information relevant to direct tunnel and LGW information; According to obtained wireless side net element information and LGW information, determine whether to use direct tunnel between described wireless side network element and LGW.

Determine whether to use the operation in direct tunnel to be carry out in following process one of at least:

UE handoff procedure;

The tracing section updating of UE or Routing Area Update or service request process.

In UE handoff procedure, determine whether to use the functional entity in direct tunnel be following one of at least:

LGW, source base station, target BS, source mobile management unit, target mobile management unit.

When being determined whether to use direct tunnel by LGW, concrete deterministic process comprises: the information of the Target cell that LGW reports according to target mobile management unit or base station, judgement can and target BS between set up direct tunnel;

When being determined whether to use direct tunnel by source base station, concrete deterministic process comprises: can source base station, according to Target cell or the information of base station and the information of LGW, judge set up direct tunnel between target BS and LGW;

When being determined whether to use direct tunnel by source mobile management unit, concrete deterministic process comprises: can source mobile management unit, according to Target cell or the information of base station and the information of LGW, judge set up direct tunnel between target BS and LGW;

When being determined whether to use direct tunnel by target BS, concrete deterministic process comprises: target BS judges whether the direct tunnel can set up between target BS and LGW according to the address information of LGW;

When being determined whether to use direct tunnel by target mobile management unit, concrete deterministic process comprises: can target mobile management unit to be connected with this locality of existence according to Target cell or the information of base station and the information of LGW, judge set up direct tunnel between target BS and LGW;

The described X2 that to switch in LTE connecting system switches, and when being determined whether to use direct tunnel by source base station or target BS, concrete deterministic process comprises: source base station or target BS, according to information mutual on X2 interface, judge that can target BS directly set up direct tunnel with LGW.

When being determined whether to use direct tunnel by LGW, the process obtaining described wireless side net element information comprises: target mobile management unit sends change in location notice by SGW and packet data gateway PGW to LGW, and the Target cell of current for UE access or base station information are reported LGW; Or,

When SGW changes, target SGW sends amendment carrying request, to inform to LGW by from the Target cell of target mobile management unit or base station information by PGW;

When being determined whether to use direct tunnel by source base station, the process obtaining described wireless side net element information comprises: source base station obtains the information of Target cell or base station in switching flow;

When being determined whether to use direct tunnel by source mobile management unit, the process obtaining described wireless side net element information comprises: source base station sends the handover request message comprising Target cell or base station information to source mobile management unit;

When being determined whether to use direct tunnel by target BS, the process obtaining described wireless side net element information comprises: target mobile management unit knows that UE accesses Target cell or base station information and has local connection to exist, and the handover request message carrying the bearer context information of UE is sent to target BS, wherein carry the information of local gateway;

When being determined whether to use direct tunnel by target mobile management unit, the process obtaining described wireless side net element information comprises: source mobile management unit sends to target mobile management unit and forwards RELOCATION REQUEST message, the Target cell of wherein carrying or base station information; The process obtaining described local gateway information comprises: source mobile management unit sends to target mobile management unit and forwards RELOCATION REQUEST message, wherein carries the contextual information of UE, comprises the information of local gateway;

The described X2 that to switch in LTE connecting system switches, and when being determined whether to use direct tunnel by target BS, the process obtaining described local gateway information comprises: target BS obtains local gateway information from source base station on X2 interface.

Determine whether to use the judged result in direct tunnel for can use direct tunnel, the method comprises further:

Mobile management unit informs LGW, sets up described direct tunnel after obtaining judged result.

In the tracing section updating or service request process of UE, determine whether to use the functional entity in direct tunnel be following one of at least:

LGW, mobile management unit, base station.

When being determined whether to use direct tunnel by LGW, concrete deterministic process comprises: the current UE that LGW reports according to mobile management unit access community or base station information judge that direct tunnel is set up in the base station accessed with current UE can;

When mobile management unit does not change and is determined whether to use direct tunnel by mobile management unit, concrete deterministic process comprises: can the community that mobile management unit accesses according to UE or the information of base station and the information of LGW, judge set up direct tunnel between the base station that current UE accesses and LGW; Or,

When mobile management unit changes and is determined whether to use direct tunnel by source mobile management unit, concrete deterministic process comprises: can source mobile management unit, according to Target cell or the information of base station and the information of LGW, judge set up direct tunnel between target BS and LGW;

When mobile management unit changes and is determined whether to use direct tunnel by target mobile management unit, concrete deterministic process comprises: can the information of the community that target mobile management unit accesses according to current UE or base station and the information of LGW obtained from source base station, judge set up direct tunnel between base station and LGW;

When being determined whether to use direct tunnel by base station, concrete deterministic process comprises: base station judges whether the direct tunnel can set up between LGW according to the address information of LGW.

When being determined whether to use direct tunnel by LGW, the process obtaining described wireless side net element information comprises: mobile management unit sends change in location notice, so that the community of current for UE access or base station information are reported LGW by SGW, PGW to LGW;

When mobile management unit does not change and determined whether to use direct tunnel by mobile management unit, the process obtaining described wireless side net element information comprises: mobile management unit obtains the community of UE access or the information of base station from tracing section updating request or service request;

When mobile management unit changes and is determined whether to use direct tunnel by source mobile management unit, the process obtaining described wireless side net element information comprises: target mobile management unit sends context request message to source mobile management unit, wherein carries the community of UE access or the identification information of base station;

When mobile management unit does not change and determined whether to use direct tunnel by mobile management unit, the process obtaining described wireless side net element information comprises: mobile management unit obtains the community of UE access or the information of base station from tracing section updating request or service request; The process obtaining described LGW information comprises: source mobile management unit sends context response information to target mobile management unit, wherein carries the information comprising LGW in the context of UE;

When being determined whether to use direct tunnel by base station, the process obtaining described wireless side net element information comprises: mobile management unit sends initial context and sets up request to base station, wherein carry the contextual information of UE.

When determining whether to use direct tunnel, the comparison table of the LGW and wireless side network element that can set up direct tunnel is considered.

Realize a device for Route Selection, this device comprises direct tunnel decision information maintenance unit, directly tunnel decision package; Wherein,

Described direct tunnel decision information maintenance unit, for the wireless side network element that will access for UE, obtains this wireless side net element information relevant to direct tunnel and LGW information;

Described direct tunnel decision package, for according to obtained wireless side net element information and LGW information, determines whether to use direct tunnel between described wireless side network element and LGW.

Described direct tunnel decision package determines whether the operation that can use direct tunnel, is to carry out in following process one of at least:

UE handoff procedure;

The tracing section updating of UE or service request process.

In UE handoff procedure, described direct tunnel decision package be arranged at following functions entity one of at least in:

When described direct tunnel decision package is arranged in LGW, for: the positional information reported according to target mobile management unit judge can and target BS between set up direct tunnel;

When described direct tunnel decision package is arranged in source base station, for: according to the information of Target cell or base station, judge can set up direct tunnel between target BS and LGW;

When described direct tunnel decision package is arranged in the mobile management unit of source, for: according to the information of Target cell or base station, judge can set up direct tunnel between target BS and LGW;

When described direct tunnel decision package is arranged in target BS, for: the direct tunnel can set up between target BS and LGW is judged whether according to the address information of LGW;

When described direct tunnel decision package is arranged in target mobile management unit, for: connect according to the information of Target cell or base station and this locality of existence, judge can set up direct tunnel between target BS and LGW;

The described X2 that to switch in LTE connecting system switches, and when described direct tunnel decision package is arranged in source base station or target BS, for: according to information mutual on X2 interface, judge that can target BS directly set up direct tunnel with LGW.

When described direct tunnel decision package is arranged in LGW, described direct tunnel decision information maintenance unit is used for sending change in location notice by SGW and PGW to described direct tunnel decision package, the positional information of current for UE access is reported described direct tunnel decision package; Or,

When SGW changes, described direct tunnel decision information maintenance unit is used for sending amendment carrying request by target SGW, PGW, to give described direct tunnel decision package by the location information notification from target mobile management unit;

When described direct tunnel decision package is arranged in source base station, described direct tunnel decision information maintenance unit is used for the information obtaining Target cell or base station in switching flow, and sends to described direct tunnel decision package;

When described direct tunnel decision package is arranged in the mobile management unit of source, described direct tunnel decision information maintenance unit is used for sending to described direct tunnel decision package the handover request message comprising Target cell or base station information;

When described direct tunnel decision package is arranged in target BS, described direct tunnel decision information maintenance unit is used for knowing the change of UE on-position and has local connection to exist, and sends the handover request message carrying the bearer context information of UE to described direct tunnel decision package;

When described direct tunnel decision package is arranged in target mobile management unit, described direct tunnel decision information maintenance unit is used for sending to described direct tunnel decision package forwarding RELOCATION REQUEST message, wherein carries the contextual information of UE;

The described X2 that to switch in LTE connecting system switches, and when described direct tunnel decision package is arranged in source base station or target BS, safeguarded information for being maintained in information handled in reciprocal process on X2 interface, and is sent to described direct tunnel decision package by described direct tunnel decision information maintenance unit.

Determine whether to use the judged result in direct tunnel for can use direct tunnel, this device comprises direct tunnel performance element further;

Described direct tunnel decision package, is further used for described judged result being sent to described direct tunnel performance element;

Described direct tunnel performance element, for setting up described direct tunnel.

Described direct tunnel performance element is arranged in LGW.

In the tracing section updating or service request process of UE, described direct tunnel decision package be arranged at following functions entity one of at least in:

LGW, mobile management unit, base station.

When described direct tunnel decision package is arranged in LGW, for: judge that direct tunnel is set up in the base station accessed with current UE can according to the positional information that mobile management unit reports;

Mobile management unit does not change and described direct tunnel decision package is arranged in mobile management unit time, for: according to the information of base station of UE access, judge can set up direct tunnel between the base station that current UE accesses and LGW; Or,

Mobile management unit changes and described direct tunnel decision package is arranged in the mobile management unit of source time, for: according to the information of Target cell or base station, judge can set up direct tunnel between target BS and LGW;

When described direct tunnel decision package is arranged in base station, for: the direct tunnel can set up between LGW is judged whether according to the address information of LGW.

When described direct tunnel decision package is arranged in LGW, described direct tunnel decision information maintenance unit is used for sending change in location notice, so that the positional information of current for UE access is reported described direct tunnel decision package by SGW, PGW to described direct tunnel decision package;

Mobile management unit do not change and described direct tunnel decision information maintenance unit in mobile management unit time, described direct tunnel decision information maintenance unit is used for the information of the base station obtaining UE access from tracing section updating request or service request, and obtained information is sent to described direct tunnel decision package;

Mobile management unit changes and described direct tunnel decision package is arranged in the mobile management unit of source time, described direct tunnel decision information maintenance unit is used for sending context request message to described direct tunnel decision package, wherein carries the identification information of the base station of UE access;

When described direct tunnel decision package is arranged in base station, described direct tunnel decision information maintenance unit is used for sending initial context to described direct tunnel decision package and sets up request, wherein carries the contextual information of UE.

Described direct tunnel performance element is arranged in LGW.

When described direct tunnel decision package determines whether to use direct tunnel, for considering the gateway information comprising comparison table can setting up direct tunnel.

The present invention realizes the method and apparatus of Route Selection, can judge whether flexibly to need to set up direct tunnel for UE according to contents such as the system informations in practical application scene, therefore, it is possible to significantly improve transfer of data flexibility, and also can ensure the high efficiency that data are transmitted as far as possible.

Accompanying drawing explanation

Fig. 1 is the structural representation of evolution grouping domain system;

Fig. 2 is 3G home base station network configuration diagram;

Fig. 3 is one of LTE femtocell network architecture schematic diagram;

Fig. 4 is LTE femtocell network architecture schematic diagram two;

Fig. 5 is LTE femtocell network architecture schematic diagram three;

Fig. 6 is one of network architecture schematic diagram realizing local access;

Fig. 7 is in the handoff procedure of one embodiment of the invention, is carried out the flow chart of Route Selection by local gateway;

Fig. 8 is in the handoff procedure of another embodiment of the present invention, is carried out the flow chart of Route Selection by local gateway;

Fig. 9 is in the handoff procedure of one embodiment of the invention, is carried out the flow chart of Route Selection by source wireless side network element;

Figure 10 is in the handoff procedure of one embodiment of the invention, is carried out the flow chart of Route Selection by source mobile management unit;

Figure 11 is in the handoff procedure of one embodiment of the invention, is carried out the flow chart of Route Selection by Target Wireless side network element;

Figure 12 is in the handoff procedure of one embodiment of the invention, is carried out the flow chart of Route Selection by target mobile management unit;

Figure 13 be one embodiment of the invention LTE connecting system in X2 handoff procedure, carry out the flow chart of Route Selection;

Figure 14, in the tracing section updating of one embodiment of the invention or service request process, is carried out the flow chart of Route Selection by local gateway;

Figure 15, in the tracing section updating of one embodiment of the invention or service request process, is carried out the flow chart of Route Selection by mobile management unit;

Figure 16, in the tracing section updating of one embodiment of the invention or service request process, is carried out the flow chart of Route Selection by base station;

Figure 17, in the tracing section updating of one embodiment of the invention or service request process, is carried out the flow chart of Route Selection by source mobile management unit;

Figure 18 is the general flow chart realizing Route Selection of one embodiment of the invention;

Figure 19 is the installation drawing realizing Route Selection of one embodiment of the invention.

Embodiment

In actual applications, if LTE access, then base station refers to ordinary base station or base station from home, and mobile management unit refers to MME.Further, if base station from home and in the framework comprising home base-station gateway, the message then transmitted between base station and mobile management unit also needs to pass through home base-station gateway, but home base-station gateway can not revise parameter related to the present invention, therefore specified otherwise is not carried out to this framework here.In addition, if UTRAN/GERAN access, then base station refers to RNC or HNBGW, and mobile management unit refers to SGSN.

Be in the handoff procedure of one embodiment of the invention see Fig. 7, Fig. 7, carried out the flow chart of Route Selection by LGW.Flow process shown in Fig. 7 is applicable to switch in LTE connecting system, switch in UTRAN/GERAN intra-system handover or between LTE and UTRAN/GERAN system.

If switched in same system, as switched in LTE system, or in UTRAN/GERAN intra-system handover, mobile management unit may not change.If mobile management unit does not change, then source mobile management unit and target mobile management unit can regard same network element as, and all message transmitted between can be omitted.Before handover, UE has established local connection.Establish expansion tunnel between PGW and LGW, between LGW and source base station, establish direct tunnel.

Shown in Fig. 7, flow process comprises the following steps:

Step 700: source base station initiates switching flow, and requires UE reporting measurement reports.

Step 701: after source base station have selected target BS, sends handover request message to source mobile management unit, wherein comprises the information such as bearing identification of target BS mark/Target Cell Identifier and target following district/Routing Area Identifier, UE.

Step 702: source mobile management unit sends to target mobile management unit and forwards RELOCATION REQUEST message, wherein carries the contextual information of UE.Because UE has established local connection, then also need to comprise the information such as the address of SGW and tunnel end mark, the address of LGW and tunnel end mark in contextual information.

Step 703: target mobile management unit judges whether to need to reselect SGW, is judged in present embodiment not need.Target mobile management unit connects according to this locality of the change of UE on-position and existence, judges to need to report the positional information of UE to LGW.Target mobile management unit sends change in location notice by SGW and PGW to LGW, the positional information of current for UE access is reported LGW, and the content reported can comprise target BS mark and/or Target Cell Identifier and/or target following district/Routing Area Identifier.

The positional information that step 704:LGW reports according to target mobile management unit judge can and target BS between set up direct tunnel.

Judged result is carried in change in location push-notification-answer by step 705:LGW, informs target mobile management unit by PGW and SGW.

Step 706: target mobile management unit, according to the judged result of LGW, determines that issuing the address of SGW and the address of tunnel end mark or LGW and tunnel end identifies to target BS.If LGW judges to set up direct tunnel, then target BS is handed down in the address of LGW and tunnel end mark by target mobile management unit; If LGW judges to set up direct tunnel, then target BS is handed down in the address of SGW and tunnel end mark by target mobile management unit.

Step 707: target mobile management unit sends handover request message to target BS, wherein carries the bearer context information of UE.If LGW judges to set up direct tunnel, then target BS is handed down in the address of LGW and tunnel end mark by target mobile management unit; If LGW judges to set up direct tunnel, then target BS is handed down in the address of SGW and tunnel end mark by target mobile management unit.

The residue flow process switching and prepare is performed after this process.Step 707 and step 708 middle institute abridged process are prior aries, are known in those skilled in the art, and unrelated to the invention, do not repeat here.

Step 708:UE is switched to objective network, sends switching complete request to target BS.

Step 709: target BS sends switching notice request to target mobile management unit, wherein carries the Base Station Identification of the current access of UE and/or the address of tracking area/Routing Area Identifier and/or cell ID and target BS and tunnel, user face end and identifies.

Step 710: the information whether target mobile management unit can be set up according to the direct tunnel obtained before judges how to perform subsequent step.

Step 711: if judge before to set up direct tunnel, then target mobile management unit is to SGW transmission amendment carrying request, wherein carries address, user face and the tunnel end mark of target BS and notifies that address above mentioned is sent to the instruction of LGW by SGW.

If be judged as setting up direct tunnel before, then target mobile management unit sends amendment carrying request to SGW, wherein carries address, user face and the tunnel end mark of target BS, but does not need instruction SGW that address above mentioned is sent to LGW.In this case, do not need to perform step 712 to step 713, directly perform step 714.

Step 712:SGW, to PGW transmission amendment carrying request, wherein carries address, user face and the tunnel end mark of target BS and notifies that address above mentioned is sent to the instruction of LGW by PGW.

Step 713:PGW sends amendment carrying request to LGW, wherein carries address, user face and the tunnel end mark of target BS.LGW, according to above-mentioned information, sets up the direct tunnel between LGW and target BS.

Step 714:LGW returns amendment bearing response message by PGW, SGW to target mobile management unit.

The follow-up remaining step performing switching, abridged process is prior art, is known in those skilled in the art, and unrelated to the invention, does not repeat here.

Be in the handoff procedure of another embodiment of the present invention see Fig. 8, Fig. 8, carried out the flow chart of Route Selection by LGW.Flow process shown in Fig. 8 is applicable to switch between switching, UTRAN/GERAN intra-system handover or LTE and UTRAN/GERAN system in LTE connecting system.

If switched in same system, as: in LTE system or UTRAN/GERAN intra-system handover, mobile management unit may not change.If mobile management unit does not change, then source mobile management unit and target mobile management unit can regard same network element as, and all message transmitted between can be omitted.Before handover, UE has established local connection.Establish expansion tunnel between PGW and LGW, between LGW and source base station, establish direct tunnel.

Shown in Fig. 8, flow process is compared with Fig. 7, and the step performed because SGW there occurs change is slightly different, and essential difference is following steps:

Step 803: target mobile management unit is establishment session request to the message that target SGW sends, instead of positional information reports request, but in this request, also need to carry target BS mark and/or Target Cell Identifier and/or target following district/Routing Area Identifier.

Step 804 is to step 805: target SGW by PGW send amendment carrying request, with by the above-mentioned location information notification from target mobile management unit to LGW.

The positional information that step 806:LGW reports according to target mobile management unit judge can and target BS between set up direct tunnel.

Step 807:LGW returns amendment bearing response message by PGW to target SGW, wherein carries the judged result of LGW.

Process and Fig. 7 corresponding steps of subsequent step are similar, and namely step 808 is similar to step 714 to step 817 and step 706, does not repeat here.

Be in the handoff procedure of one embodiment of the invention see Fig. 9, Fig. 9, carried out the flow chart of Route Selection by source wireless side network element.Flow process shown in Fig. 9 is applicable to switch between switching, UTRAN/GERAN intra-system handover or LTE and UTRAN/GERAN system in LTE connecting system.

If switched in same system, as in: LTE system or UTRAN/GERAN intra-system handover, mobile management unit may not change.If mobile management unit does not change, then source mobile management unit and target mobile management unit can regard same network element as, and all message transmitted between can be omitted.Before handover, UE has established local connection.Establish expansion tunnel between PGW and LGW, between LGW and source base station, establish direct tunnel.

Shown in Fig. 9, flow process comprises the following steps:

Step 900: source base station initiates switching flow, and requires UE reporting measurement reports.

Step 901: can source base station, according to the information of the Target cell obtained in switching flow (cell) or base station, judge set up direct tunnel between target BS and LGW.

Step 902: source base station sends handover request message to source mobile management unit, wherein comprise target BS mark/Target Cell Identifier and target following district/Routing Area Identifier, UE bearing identification and the indication information etc. in direct tunnel can be set up between target BS and LGW.

Step 903: source mobile management unit judges whether to need LGW address and Tunnel Identifier to send to target network element according to the indication information of source base station.

Step 904: if cannot set up direct tunnel between source base station instruction LGW and target BS, then source mobile management unit sends to target mobile management unit and forwards RELOCATION REQUEST message, wherein carries the contextual information of UE.Because UE has established local connection, then also need to comprise the information such as the address of SGW and tunnel end mark in contextual information, but do not comprise the relevant information of LGW.Subsequent target base station performs the subsequent step in existing switching flow, and this process is prior art, is known in those skilled in the art, and unrelated to the invention, does not repeat here.

If can set up direct tunnel between source base station instruction LGW and target BS, then source mobile management unit sends to target mobile management unit and forwards RELOCATION REQUEST message, wherein carries the contextual information of UE.Because UE has established local connection, then also need to comprise the address of SGW and tunnel end mark, the address of LGW and tunnel end mark in contextual information and the indication information etc. in direct tunnel can be set up.

Step 905: target mobile management unit judges whether to need to reselect SGW, is judged in present embodiment not need.According to the indication information can setting up direct tunnel, target mobile management unit determines that issuing the address of SGW and the address of tunnel end mark or LGW and tunnel end identifies to target BS.

Step 906: target mobile management unit sends handover request message to target BS, wherein carries the bearer context information of UE.If can set up direct tunnel, then target BS is handed down in the address of LGW and tunnel end mark by target mobile management unit; If cannot set up direct tunnel, then target BS is handed down in the address of SGW and tunnel end mark by target mobile management unit.

Step 907: perform the residue flow process switching and prepare.This process is prior art, is known in those skilled in the art, and unrelated to the invention, does not repeat here.

Step 908 is similar to step 714 with the step 708 in Fig. 7 to step 914, does not repeat here.

In the present embodiment, be equally applicable to the flow process that SGW changes.If SGW changes, the delivery of content that the present invention relates to also is similar.Relating to the SGW transmitting target BS in step 911 to step 914 is target SGW.SGW changes other hand off signaling caused may be different from the present embodiment, but do not relate to content involved in the present invention, do not repeat here.

Be in the handoff procedure of one embodiment of the invention see Figure 10, Figure 10, carried out the flow chart of Route Selection by source mobile management unit.Flow process shown in Figure 10 is applicable to switch between switching, UTRAN/GERAN intra-system handover or LTE and UTRAN/GERAN system in LTE connecting system.

Shown in Figure 10, flow process comprises the following steps:

Step 1001: source base station initiates switching flow, and requires UE reporting measurement reports.

Step 1002: source base station sends handover request message to source mobile management unit, wherein comprises the information such as the bearing identification of target BS mark/Target Cell Identifier and target following district/Routing Area Identifier and UE.

Step 1003: can source mobile management unit, according to the information of Target cell or base station, judge set up direct tunnel between target BS and LGW.

Step 1004: if source mobile management unit judges cannot set up direct tunnel between LGW and target BS, then source mobile management unit sends to target mobile management unit and forwards RELOCATION REQUEST message, wherein carries the contextual information of UE.Because UE has established local connection, then also need to comprise the information such as the address of SGW and tunnel end mark in contextual information, but do not comprise the relevant information of LGW.Subsequent target base station performs the subsequent step in existing switching flow, and this process is prior art, is known in those skilled in the art, and unrelated to the invention, does not repeat here.

If source mobile management unit judges can set up direct tunnel between LGW and target BS, then source mobile management unit sends to target mobile management unit and forwards RELOCATION REQUEST message, wherein carries the contextual information of UE.Because UE has established local connection, then also need to comprise the address of SGW and tunnel end mark, the address of LGW and tunnel end mark in contextual information and the indication information etc. in direct tunnel can be set up.

Step 1005: target mobile management unit judges whether to need to reselect SGW, is judged in present embodiment not need.According to the indication information can setting up direct tunnel, target mobile management unit determines that issuing the address of SGW and the address of tunnel end mark or LGW and tunnel end identifies to target BS.

Step 1006: target mobile management unit sends handover request message to target BS, wherein carries the bearer context information of UE.If can set up direct tunnel, then target BS is handed down in the address of LGW and tunnel end mark by target mobile management unit; If cannot set up direct tunnel, then target BS is handed down in the address of SGW and tunnel end mark by target mobile management unit.

Step 1007: perform the residue flow process switching and prepare.This process is prior art, is known in those skilled in the art, and unrelated to the invention, does not repeat here.

Step 1008 is similar to step 714 to step 1014 and step 708, does not repeat here.

In the present embodiment, be equally applicable to the flow process that SGW changes.If SGW changes, the delivery of content that the present invention relates to also is similar.Relating to the SGW transmitting target BS in step 1011 to step 1014 is target SGW.SGW changes other hand off signaling caused may be different from the present embodiment, but do not relate to content involved in the present invention, do not repeat here.

Be in the handoff procedure of one embodiment of the invention see Figure 11, Figure 11, carried out the flow chart of Route Selection by Target Wireless side network element.Flow process shown in Figure 11 is applicable to switch between switching, UTRAN/GERAN intra-system handover or LTE and UTRAN/GERAN system in LTE connecting system.

Shown in Figure 11, flow process comprises the following steps:

Step 1100: source base station initiates switching flow, and requires UE reporting measurement reports.

Step 1101: source base station sends handover request message to source mobile management unit, wherein comprises the information such as the bearing identification of target BS mark/Target Cell Identifier and target following district/Routing Area Identifier and UE.

Step 1102: source mobile management unit sends to target mobile management unit and forwards RELOCATION REQUEST message, wherein carry the contextual information of UE, because UE has established local connection, then also need to comprise the information such as the address of SGW and tunnel end mark, the address of LGW and tunnel end mark in contextual information.

Step 1103: target mobile management unit judges whether to need to reselect SGW, is judged in present embodiment not need.Target mobile management unit is known the change of UE on-position and is had local connection to exist, therefore send to target BS and carry the handover request message of the bearer context information of UE, comprising the address of SGW and the address of tunnel end mark and LGW and tunnel end mark.

Step 1104: target BS judges whether the direct tunnel can set up between target BS and LGW according to the address information of LGW.

Step 1105: target BS returns handoff request acknowledgment message to target mobile management unit, wherein carries the beared information successfully set up.

In addition, the indication information whether can setting up direct tunnel can also be carried.If carry this indication information in this step, then step 1107 does not need to carry this indication information.

The residue flow process switching and prepare is performed after this process.Step 1105 and 1106 middle abridged processes are prior aries, are known in those skilled in the art, and unrelated to the invention, do not repeat here.

Step 1106:UE is switched to objective network, sends switching complete request to target BS.

Step 1107: target BS sends switching notice request to target mobile management unit, wherein carries the Base Station Identification of the current access of UE and/or the address of tracking area Lu You district mark and/or cell ID and target BS and tunnel, user face end and identifies.

In addition the indication information whether can setting up direct tunnel can also be carried.If carry this indication information in this step, then step 1105 does not need to carry this indication information.

Step 1108 is similar to step 714 to step 1112 and step 710, does not repeat here.

In the present embodiment, be equally applicable to the flow process that SGW changes.If SGW changes, the delivery of content that the present invention relates to also is similar.Relating to the SGW transmitting target BS in step 1109 to step 1112 is target SGW.SGW changes other hand off signaling caused may be different from the present embodiment, but do not relate to content involved in the present invention, do not repeat here.

Be in the handoff procedure of one embodiment of the invention see Figure 12, Figure 12, carried out the flow chart of Route Selection by target mobile management unit.Flow process shown in Figure 12 is applicable to switch between switching, UTRAN/GERAN intra-system handover or LTE and UTRAN/GERAN system in LTE connecting system.

Step 1200: source base station initiates switching flow, and requires UE reporting measurement reports.

Step 1201: source base station sends handover request message to source mobile management unit, wherein comprises the information such as the bearing identification of target BS mark/Target Cell Identifier and target following district/Routing Area Identifier and UE.

Step 1202: source mobile management unit sends to target mobile management unit and forwards RELOCATION REQUEST message, wherein carries the contextual information of UE.Because UE has established local connection, then also need in contextual information to comprise the address of SGW and the information such as the address of tunnel end mark and LGW and tunnel end mark.

Step 1203: target mobile management unit judges whether to need to reselect SGW, is judged in present embodiment not need.Can target mobile management unit connects according to this locality of the information of Target cell or base station and existence, judge set up direct tunnel between target BS and LGW.

Step 1204: target mobile management unit sends handover request message to target BS, wherein carries the bearer context information of UE.

In addition, if target mobile management unit judges cannot set up direct tunnel between LGW and target BS, then target mobile management unit sends to target mobile management unit and forwards RELOCATION REQUEST message, wherein carry the contextual information of UE, wherein need the information such as address and tunnel end mark comprising SGW, but do not comprise the relevant information of LGW.Subsequent target base station performs the subsequent step in existing switching flow, and this process is prior art, is known in those skilled in the art, and unrelated to the invention, does not repeat here.

If target mobile management unit judges can set up direct tunnel between LGW and target BS, then target mobile management unit sends to target mobile management unit and forwards RELOCATION REQUEST message, wherein carry the contextual information of UE, wherein need the information such as address and tunnel end mark comprising LGW, but do not comprise the relevant information of SGW.

Step 1205: target BS returns handoff request acknowledgment message to target mobile management unit, wherein carries the beared information successfully set up.

Step 1206 performed after this process is similar to step 714 to step 1212 and step 708, does not repeat here.

In the present embodiment, be equally applicable to the flow process that SGW changes.If SGW changes, the delivery of content that the present invention relates to also is similar.Relating to the SGW transmitting target BS in step 1209 to step 1212 is target SGW.SGW changes other hand off signaling caused may be different from the present embodiment, but do not relate to content involved in the present invention, do not repeat here.

See Figure 13, Figure 13 be one embodiment of the invention LTE connecting system in X2 handoff procedure, carry out the flow chart of Route Selection.Flow process shown in Figure 13 is applicable to switch in LTE connecting system.Before handover, UE has established local connection.Establish expansion tunnel between PGW and LGW, between LGW and source base station, establish direct tunnel.

Shown in Figure 13, flow process comprises the following steps:

Step 1301: source base station initiates switching flow.Because source base station and target BS directly exist X2 interface, therefore can pass through X2 interface interacting message information each other between the two, and complete wireless resource reservation.After this process performs, UE is switched to target BS.

Target BS or source base station according to information handled in reciprocal process on X2 interface, can judge that can target BS directly set up direct tunnel with LGW.

Step 1302: can target BS, to mobile management unit transmit path transition request message, wherein carry the indication information setting up direct tunnel.

Step 1303: mobile management unit judges how to perform subsequent step according to the information whether setting up direct tunnel obtained.Mobile management unit also needs to judge that SGW is the need of change, and being judged as here needs change.

Step 1304: if judge before to set up direct tunnel, then mobile management unit sends to target SGW and creates session request, wherein carries address, user face and the tunnel end mark of target BS and notifies that address above mentioned is sent to the instruction of LGW by SGW.

If be judged as setting up direct tunnel before, then target mobile management unit sends amendment carrying request to SGW, wherein carries address, user face and the tunnel end mark of target BS, but does not need instruction SGW that address above mentioned is sent to LGW.In this case, do not need to perform step 1305 to step 1307, but directly perform step 1308.

Step 1305: target SGW, to PGW transmission amendment carrying request, wherein carries address, user face and the tunnel end mark of target BS and notifies that address above mentioned is sent to the instruction of LGW by PGW.

Step 1306:PGW sends amendment carrying request to LGW, wherein carries address, user face and the tunnel end mark of target BS.LGW sets up the direct tunnel between LGW and target BS according to the above-mentioned information received.

Step 1307:LGW returns amendment bearing response message by PGW to target SGW.

Step 1308: target SGW returns to mobile management unit and creates conversational response message

Step 1309: mobile management unit is to target BS transmit path conversion response message.

If judge in step 1303 to set up direct tunnel, then comprise address and the tunnel end mark of LGW in this message.

If judge in step 1303 to set up direct tunnel, then comprise address and the tunnel end mark of SGW in this message.

Step 1310: mobile management unit sends to source SGW and deletes session request, requires the UE context above the SGW of deletion source; Source SGW deletes session according to the request of mobile management unit.

In the present embodiment, be equally applicable to the flow process that SGW is constant.If SGW is constant, then two message in step 1304 and step 1308 are amendment carrying request and amendment carrying response respectively, and the delivery of content that the present invention relates to or similar.In this case, step 1310 is without the need to performing.

Be in the tracing section updating of one embodiment of the invention or service request process see Figure 14, Figure 14, carried out the flow chart of Route Selection by LGW.Flow process shown in Figure 14 is applicable to tracking area/Routing Area Update process that service request process in EUTRAN/UTRAN/GERAN connecting system and EUTRAN/UTRAN/GERAN connecting system, mobile management unit and SGW do not change.Before initiating updating of tracking area request or service request, UE has established local connection.Expansion tunnel has been established between PGW and LGW.

Step 1401 passes through base station initiating updating of tracking area request or service request to step 1402:UE.

Step 1403: mobile management unit connects according to this locality of the change of UE on-position and existence, judges to need to report the positional information of UE to LGW.Mobile management unit sends change in location notice by SGW, PGW to LGW, and so that the positional information of current for UE access is reported LGW, the content reported can comprise access base station mark and/or access cell ID and/or access tracking area/Routing Area Identifier.

According to the positional information that mobile management unit reports, step 1404:LGW judges that direct tunnel is set up in the base station accessed with current UE can.

Judged result is carried in change in location push-notification-answer by step 1405:LGW, informs mobile management unit by PGW, SGW.

Step 1406: mobile management unit, according to the judged result of LGW, determines that issuing the address of SGW and the address of tunnel end mark or LGW and tunnel end identifies to the base station of current access.

Step 1407: mobile management unit sends initial context and sets up request to base station, wherein carry the contextual information of UE.

If LGW judges to set up direct tunnel, then comprise address and the tunnel end mark of LGW in the contextual information of UE; If LGW judges to set up direct tunnel, then comprise address and the tunnel end mark of SGW in the contextual information of UE.

The base station triggers of the current access of step 1408:UE sets up empty port load-supporting, and sends initial context foundation response to mobile management unit, wherein carries address and the tunnel end mark of base station.

Step 1409 is similar to step 714 with step 710 to 1413, does not repeat here.

The remaining step of follow-up execution tracing section updating or service request, abridged process is prior art, is known in those skilled in the art, and unrelated to the invention, does not repeat here.

If tracking area/Routing Area Update in the present embodiment, be equally applicable to the flow process that SGW changes.If SGW changes, the delivery of content that the present invention relates to also is similar, and essential difference is following steps:

Step 1403: target mobile management unit is establishment session request to the message that target SGW sends, instead of positional information reports request, but in this establishment session request, also need to carry target BS mark and/or Target Cell Identifier and/or target following district/Routing Area Identifier.

Step 1405: target SGW returns to the message of mobile management unit for creating conversational response.

Relating to the SGW transmitting target BS in step 1410 to step 1413 is target SGW.SGW changes other hand off signaling caused may be different from the present embodiment, but do not relate to content involved in the present invention, do not repeat here.

Further, the present embodiment is also useful in the scene of mobile management unit change in tracking area/Routing Area Update process.If mobile management unit changes, what the mobile management unit then in figure referred to is all target mobile management unit, between source mobile management unit and target mobile management unit is technology known in those skilled in the art alternately, and unrelated to the invention, does not here repeat.

Be in the tracing section updating of one embodiment of the invention or service request process see Figure 15, Figure 15, carried out the flow chart of Route Selection by mobile management unit.Flow process shown in Figure 15 is applicable to the tracing section updating process that service request process in EUTRAN/UTRAN/GERAN connecting system and EUTRAN connecting system, mobile management unit and SGW do not change.Before initiating updating of tracking area request or service request, UE has established local connection.Expansion tunnel has been established between PGW and LGW.

Shown in Figure 15, flow process comprises the following steps:

Step 1501:UE is by base station initiating updating of tracking area request or service request.

Step 1502: can mobile management unit, according to the information of the base station of the UE access got from tracing section updating request or service request, judge set up direct tunnel between the base station that current UE accesses and LGW.

Step 1503: if mobile management unit judges to set up direct tunnel, then mobile management unit sends initial context to the base station that UE accesses and sets up request, wherein carries the contextual information of UE.Because UE has established local connection, then also need to comprise the information such as the address of SGW and tunnel end mark in contextual information, but do not comprise the relevant information of LGW.Subsequent step in the existing switching flow of follow-up execution, this process is prior art, is known in those skilled in the art, and unrelated to the invention, does not repeat here.

If mobile management unit judges to set up direct tunnel, then mobile management unit sends initial context to the base station that UE accesses and sets up request, wherein carries the contextual information of UE.Because UE has established local connection, then also need the address and the tunnel end mark that comprise LGW in contextual information.

The base station triggers of step 1504:UE access sets up empty port load-supporting, returns initial context set up response to mobile management unit, wherein carries address and the tunnel end mark of base station.

Step 1505 is similar to step 714 to step 1508 and step 711, does not repeat here.

If tracing section updating in the present embodiment, be equally applicable to the flow process that SGW changes.If SGW changes, the delivery of content that the present invention relates to also is similar.Relating to the SGW transmitting target BS in step 1505 to step 1508 is target SGW.SGW changes other hand off signaling caused may be different from the present embodiment, but do not relate to content involved in the present invention, do not repeat here.

Further, the present embodiment is also applicable to the scene of mobile management unit change in tracing section updating process.If mobile management unit changes, what the mobile management unit then in figure referred to is all target mobile management unit, between source mobile management unit and target mobile management unit is technology known in those skilled in the art alternately, wherein source mobile management unit comprises the information of local gateway in the UE contextual information in the context response request of mark mobile management unit transmission, other steps and information unrelated to the invention, here do not repeat.

Be in the tracing section updating of one embodiment of the invention or service request process see Figure 16, Figure 16, carried out the flow chart of Route Selection by base station.Flow process shown in Figure 16 is applicable to the tracing section updating process that service request process in EUTRAN/UTRAN/GERAN connecting system and EUTRAN connecting system, mobile management unit and SGW do not change.Before initiating updating of tracking area request or service request, UE has established local connection.Expansion tunnel has been established between PGW and LGW.

Shown in Figure 16, flow process comprises the following steps:

Step 1601 passes through base station initiating updating of tracking area request or service request to step 1602:UE.

Step 1603: mobile management unit sends initial context and sets up request to base station, wherein carry the contextual information of UE.Because UE has established local connection, then also need in contextual information to comprise the address of SGW and the address of tunnel end identification information and LGW and tunnel end identification information etc.

Step 1604: base station judges whether the direct tunnel can set up between LGW according to the address information of LGW.

Step 1605: base station triggers sets up empty port load-supporting, return initial context to mobile management unit and set up response message, wherein carry successfully set up beared information, the address of base station and tunnel end mark and the direct indication information that whether can set up of tunnel.

Step 1606, does not repeat to step 1610 here with similar to step 714 with step 710.

If tracing section updating in the present embodiment, be equally applicable to the flow process that SGW changes.If SGW changes, the delivery of content that the present invention relates to also is similar.Relating to the SGW transmitting target BS in step 1607 to 1610 is target SGW.SGW changes other hand off signaling caused may be different from the present embodiment, but do not relate to content involved in the present invention, do not repeat here.

Further, the present embodiment is also applicable to the scene of mobile management unit change in tracking area/Routing Area Update process.If mobile management unit changes, what the mobile management unit then in figure referred to is all target mobile management unit, between source mobile management unit and target mobile management unit is technology known in those skilled in the art alternately, wherein source mobile management unit comprises the information of local gateway in the UE contextual information in the context response request of mark mobile management unit transmission, other steps and information unrelated to the invention, here do not repeat.

Be in the tracing section updating of one embodiment of the invention or service request process see Figure 17, Figure 17, carried out the flow chart of Route Selection by source mobile management unit.Flow process shown in Figure 17 is applicable to the process of tracking area routing update in EUTRAN/UTRAN/GERAN connecting system or Routing Area Update.Cross Cheng Qian at initiation tracking area or Routing Area Update, UE has established local connection.Expansion tunnel has been established between PGW and LGW.

Shown in Figure 17, flow process comprises the following steps:

Step 1701 passes through base station initiating updating of tracking area request or Routing Area Update request to step 1702:UE.

Step 1703: target mobile management unit sends context request message to source mobile management unit, wherein carry the identification information of the base station of UE access, this identification information can be access base station mark and/or access cell ID and/or access tracking area/Routing Area Identifier.

Step 1704: can source mobile management unit, according to the information of Target cell or base station, judge set up direct tunnel between target BS and LGW.

Step 1705: if source mobile management unit judges to set up direct tunnel, then source mobile management unit sends context response information to target mobile management unit, wherein carries the contextual information of UE.Because UE has established local connection, then also need to comprise the information such as the address of SGW and tunnel end mark in contextual information, but do not comprise the relevant information of LGW.The subsequent step of follow-up execution existing tracking area/Routing Area Update flow process, this process is prior art, is known in those skilled in the art, and unrelated to the invention, does not repeat here.

If source mobile management unit judges to set up direct tunnel, then source mobile management unit sends context acknowledge message to target mobile management unit, wherein carries the contextual information of UE.Because UE has established local connection, then also need to comprise the address of SGW and tunnel end mark, the address of LGW and tunnel end mark in contextual information and the indication information etc. in direct tunnel can be set up.

Step 1706: target mobile management unit sends context acknowledge message to source mobile management unit.

If tracing section updating process, also need for UE sets up radio bearer, then need to perform step 1707 to step 1708; Otherwise step 1707 and step 1708 step can be skipped, directly perform follow-up flow process.

Step 1707 is to step 1708: target mobile management unit sends initial context and sets up request to base station, base station triggers sets up empty port load-supporting, and returns initial context to target mobile management unit and set up response message.

Step 1709 is similar to step 714 to step 1713 and step 710, does not repeat here.

If tracking area/Routing Area Update in the present embodiment, be equally applicable to the flow process that SGW changes.If SGW changes, the delivery of content that the present invention relates to also is similar.Relating to the SGW transmitting target BS in step 1710 to step 1713 is target SGW.SGW changes other hand off signaling caused may be different from the present embodiment, but do not relate to content involved in the present invention, do not repeat here.

Known in conjunction with above flow process, the technical thought that the present invention realizes Route Selection can represent as shown in figure 18.See the general flow chart realizing Route Selection that Figure 18, Figure 18 are one embodiment of the invention, this flow process comprises the following steps:

Step 1810: the wireless side network element that will access for UE, obtains this wireless side net element information relevant to direct tunnel and LGW information.Described wireless side net element information comprise following one of at least: closed user group mark, tracking area identification, Routing Area Identifier, Base Station Identification, cell ID.Described LGW information comprise following one of at least: address, domain-name information.

Step 1820: according to obtained wireless side net element information and LGW information, determines whether to use direct tunnel between described wireless side network element and LGW.Concrete defining method has multiple, as: according to the wireless side net element information that obtains and LGW information, configuration is set up in the tunnel corresponding to above-mentioned information searching acquisition in the gateway information such as comparison table can setting up direct tunnel, sets up configuration know whether can use direct tunnel by the tunnel found.

Above-mentioned gateway information can be local static configuration, or is dynamically issued by carrier-managed system, or by obtain to the inquiry of other network elements.Other network elements described include but not limited to dns server, operator's configuration management system etc.

Step 1830: when determining to use direct tunnel, described wireless side network element with set up the direct tunnel supporting UE to communicate between LGW.

In actual applications, in order to realize the above flow process smoothly, setting as shown in figure 19 can be carried out.See the installation drawing realizing Route Selection that Figure 19, Figure 19 are one embodiment of the invention, this device comprises connected direct tunnel decision information maintenance unit, directly tunnel decision package, directly tunnel performance element.Each unit can set up separately or close is located at each position in network, as long as can realize various function smoothly and realize Route Selection.

When practical application, the wireless side network element that direct tunnel decision information maintenance unit will be able to access for UE, obtain and safeguard this wireless side net element information relevant to direct tunnel and LGW information, described wireless side net element information and LGW information can also be sent to direct tunnel decision package.

Direct tunnel decision package according to the wireless side net element information received and LGW information, can determine whether can use direct tunnel between described wireless side network element and LGW, and notifies direct tunnel performance element.

Direct tunnel performance element when direct tunnel decision package is determined to use direct tunnel, according to from direct tunnel decision package notice described wireless side network element with set up the direct tunnel supporting UE to communicate between LGW.

Specific operation process achieved by above-mentioned each operating unit is described in detail in foregoing schemes, does not repeat them here.

Visible in sum, no matter be method or device, the technology that the present invention realizes Route Selection can judge whether to need to set up direct tunnel for UE according to contents such as the system informations in practical application scene flexibly, therefore, it is possible to significantly improve transfer of data flexibility, and also can ensure the high efficiency that data are transmitted as far as possible.

The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention, and all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims

1. realize a method for Route Selection, it is characterized in that, the method comprises:

For the wireless side network element that user equipment (UE) will access, obtain this wireless side net element information relevant to direct tunnel and local gateway LGW information; According to obtained wireless side net element information and LGW information, determine whether to use direct tunnel between described wireless side network element and LGW;

Wherein, the operation in direct tunnel is determined whether to use to be carry out in following process one of at least: UE handoff procedure; The tracing section updating of UE or Routing Area Update or service request process; In UE handoff procedure, determine whether to use the functional entity in direct tunnel be following one of at least: LGW, source base station, target BS, source mobile management unit, target mobile management unit;

2. method according to claim 1, is characterized in that:

When being determined whether to use direct tunnel by LGW, the process obtaining described wireless side net element information comprises: target mobile management unit sends change in location notice by gateway SGW and packet data gateway PGW to LGW, and the Target cell of current for UE access or base station information are reported LGW; Or,

3. the method according to any one of claim 1 to 2, is characterized in that, determines whether to use the judged result in direct tunnel for can use direct tunnel, and the method comprises further:

4. method according to claim 1, is characterized in that, when determining whether to use direct tunnel, considers the comparison table of the LGW and wireless side network element that can set up direct tunnel.

5. realize a method for Route Selection, it is characterized in that, the method comprises:

Wherein, the operation in direct tunnel is determined whether to use to be carry out in following process one of at least: UE handoff procedure; The tracing section updating of UE or Routing Area Update or service request process; In the tracing section updating or service request process of UE, determine whether to use the functional entity in direct tunnel be following one of at least: LGW, mobile management unit, base station;

6. method according to claim 5, is characterized in that:

7. the method according to any one of claim 5 to 6, is characterized in that, determines whether to use the judged result in direct tunnel for can use direct tunnel, and the method comprises further:

8. method according to claim 5, is characterized in that, when determining whether to use direct tunnel, considers the comparison table of the LGW and wireless side network element that can set up direct tunnel.

9. realize a device for Route Selection, it is characterized in that, this device comprises direct tunnel decision information maintenance unit, directly tunnel decision package; Wherein,

Described direct tunnel decision package, for according to obtained wireless side net element information and LGW information, determines whether to use direct tunnel between described wireless side network element and LGW; Described direct tunnel decision package determines whether the operation that can use direct tunnel, is to carry out in following process one of at least: UE handoff procedure; The tracing section updating of UE or service request process; In UE handoff procedure, described direct tunnel decision package be arranged at following functions entity one of at least in: LGW, source base station, target BS, source mobile management unit, target mobile management unit;

10. device according to claim 9, is characterized in that:

11. devices according to any one of claim 9 to 10, it is characterized in that, determine whether to use the judged result in direct tunnel for can use direct tunnel, this device comprises direct tunnel performance element further;

12. devices according to claim 11, is characterized in that, described direct tunnel performance element is arranged in LGW.

13. devices according to claim 9, is characterized in that, when described direct tunnel decision package determines whether to use direct tunnel, for considering the gateway information comprising comparison table can setting up direct tunnel.

14. 1 kinds of devices realizing Route Selection, is characterized in that, this device comprises direct tunnel decision information maintenance unit, directly tunnel decision package; Wherein,

Described direct tunnel decision package, for according to obtained wireless side net element information and LGW information, determines whether to use direct tunnel between described wireless side network element and LGW; Described direct tunnel decision package determines whether the operation that can use direct tunnel, is to carry out in following process one of at least: UE handoff procedure; The tracing section updating of UE or service request process; In the tracing section updating or service request process of UE, described direct tunnel decision package be arranged at following functions entity one of at least in: LGW, mobile management unit, base station;

15. devices according to claim 14, is characterized in that:

16., according to claim 14 to the device described in 15 any one, is characterized in that, determine whether to use the judged result in direct tunnel for can use direct tunnel, this device comprises direct tunnel performance element further;

17. devices according to claim 16, is characterized in that, described direct tunnel performance element is arranged in LGW.

18. devices according to claim 14, is characterized in that, when described direct tunnel decision package determines whether to use direct tunnel, for considering the gateway information comprising comparison table can setting up direct tunnel.