CN102256329A

CN102256329A - Path selection method and device

Info

Publication number: CN102256329A
Application number: CN2010101797450A
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: 2011-11-23
Anticipated expiration: 2030-05-19
Also published as: WO2011143997A1; CN102256329B

Abstract

The invention discloses a path selection method and a path selection device. The method comprises the following steps of: acquiring wireless side network element information and local gateway information related to a direct tunnel for a wireless side network element to be accessed by user equipment; and determining whether the direct tunnel can be used between the wireless side network element and a local gateway or not according to the acquired wireless side network element information and the acquired local gateway information. By the path selection method and the path selection device, the establishment of the direct tunnel can be flexibly judged whether to be required by the user equipment according to contents such as system information and the like in an actual application scenario; therefore, data transmission flexibility can be remarkably improved, and the high efficiency of data transmission can be ensured as much as possible.

Description

A kind of realization method of routing and device

Technical field

The present invention relates to the communications field, be specifically related to a kind of realization method of routing and device.

Background technology

In order to keep the competitiveness of 3-G (Generation Three mobile communication system) in the communications field, speed is faster, time delay is lower, the mobile communication service of personalization more for the user provides, and reduction operating cost of operator, 3GPP (3rdGeneration Partnership Project, third generation partner program) the standard operation group just is being devoted to evolved packet system (Evolved Packet System, research EPS).Fig. 1 shows the structural representation of evolution grouping domain system, and as shown in Figure 1, whole EPS system is divided into wireless access network and core net two parts.In core net, comprised home subscriber server (Home Subscriber Server, HSS), Mobility Management Entity (Mobility Management Entity, MME), Serving GPRS Support Node (ServingGPRS Support Node, SGSN), policy charging rule function (Policy and Charging RuleFunction, PCRF), gateway (Serving Gateway, SGW), packet data gateway (PDNGateway, PGW) and packet data network (Packet Data Network, packet data network) etc.Below detailed each several part function:

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

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

SGSN is the business support point of GERAN and UTRAN user access core network network, and function and Mobility Management Entity are similar, is responsible for user's position renewal, paging management and bearer management etc.

Gateway is the gateway that core net arrives wireless system, is responsible for terminal to the user plane bearer of core net, the metadata cache under the terminal idle pulley, can realize function, Lawful Interception and the grouped data route and the forwarding capability of network side initiation service request; Gateway is responsible for adding up the situation that user terminal uses wireless network, and produces the ticket that terminal is used wireless network, sends charging gateway to.

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

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

Policy charging rule functional entity is to be responsible for providing charge control, the control of online credit, thresholding control, service quality (Quality of Service, QoS) server of tactful aspect rule in the evolution system.

Wireless access network, by evolution base station (E-UTRAN NodeB, eNB) and 3G radio network controller (Radio Network Control, RNC) form, the main transmitting-receiving of being responsible for wireless signal, by air interface and terminal contact, the Radio Resource of management air interface, scheduling of resource, access control etc.

Above-mentioned SGSN is through upgrading, can support and gateway between the S4 interface, and and mobility management unit between adopt the GTPv2 agreement to carry out intercommunication.And for the SGSN that supports the 3G core net, the PS territory network architecture and Fig. 1 are different.This moment, SGSN adopted gn interface to link to each other with MME, adopted the GTPv1 protocol interconnection.SGSN links to each other with gateway, and (Gateway GPRS Support Node GGSN), visits directly to carry out packet data network but be connected to Gateway GPRS Support Node by gn interface.

Home eNodeB comprises common Home eNodeB (Home NodeB, HNB) and the Home eNodeB of evolution (Home eNodeN, HeNB), it is small-sized, the lower powered base station of a class, dedicated resources as the certain user is deployed in private sites such as family, group, company or school, be mainly used in to the user provides higher service rate and reduces the needed expense of use high rate services, remedy the covering deficiency of existing distributed cellular radio communication system simultaneously.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 (Long Term Evolution, the Long Term Evolution) mobile communications network.For the ease of Home eNodeB is managed, in network, introduced new network element: femto gateway.The major function that femto gateway is realized is: the fail safe of checking Home eNodeB, maintenance management is carried out in the operation of Home eNodeB, and according to Carrier Requirements configuration and control Home eNodeB, be responsible for the data message of exchcange core net and Home eNodeB.Fig. 2 is a 3G home base station network Organization Chart, and the 3G Home eNodeB is connected to femto gateway by the Iuh interface of redetermination, and femto gateway is provided to the IuPS and the IuCs interface of core network packet-domain and circuit domain.For 3G network, femto gateway must shield the influence of introducing behind the Home eNodeB terminal and network side.For the LTE network, femto gateway is optionally, so two kinds of connected modes are arranged between LTE Home eNodeB and the core net, and a kind of is that Home eNodeB directly links to each other with core network element, another kind is that Home eNodeB links to each other with core network element by gateway, respectively as shown in Figure 3, Figure 4.Scene for introducing femto gateway shown in Figure 4, femto gateway can not integrated user plane functions, directly sets up user's face between Home eNodeB and core net user plane gateway, can make the flattening of user's face like this, data transmission delay is reduced, as shown in Figure 5.

Home eNodeB can also support local IP to insert except supporting by the access of mobile core network.Possess at Home eNodeB under the condition of local IP access capability and the signatory permission of user local IP access, can realize that the user inserts this locality of other IP devices of home network or internet.Can realize the shunting of Internet data service by local access function, reducing the core net load, and can not pass through core net, make the transfer of data convenient and efficient for the visit of home network device.Local IP access function also can use on macrocellular, and main application and Home eNodeB are similar, more is to be applied in local IP to insert this scene of Internet, and purpose is to reduce the core net load.Fig. 6 has provided the framework of realizing above-mentioned local access function.Wherein, local access network closes the network that is linked into external network (for example internet) as this locality, and functions such as address assignment, charging, grouping packet filtering, policy control are provided.This network element can be used as self-existent network element as a logical block in actual deployment, also can unite deployment with existing base station from home or home base-station gateway.And, if this network element exists as an independent network element, then both can be positioned at the wireless side network, also can be positioned at core net.

Still can keep in the process that customer location is moved continuously for this locality is connected, can also introduce expansion tunnel (Extension Tunnel).When UE initially connects, between wireless side network element and local gateway (LGW), use direct tunnel Data transmission, to guarantee the high efficiency of data passes.In case the position of UE has taken place to move, and then can not re-use direct tunnel Data transmission between wireless side network element that UE will insert and the LGW, but continue Data transmission, thereby guarantee professional continuity by the expansion tunnel.Obviously, above-mentioned UE moves the fixing mode of using the expansion tunnel in back in the position, lack flexibility, and is unfavorable for the high efficiency of data passes.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of realization method of routing and device, to improve the transfer of data flexibility, guarantees the high efficiency of data passes as far as possible.

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

A kind of realization method of routing, this method comprises:

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

The operation that determines whether to use direct tunnel is to carry out in following process one of at least:

The UE handoff procedure;

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

In the UE handoff procedure, the functional entity that determines whether to use 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 definite process comprises: the Target cell that LGW reports according to the target mobile management unit or the information of 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 definite process comprises: can source base station be judged between target BS and the LGW and be set up direct tunnel according to the information of Target cell or base station and the information of LGW;

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

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

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

The described interior X2 of LTE connecting system that switches to switches, and when determining whether to use direct tunnel by source base station or target BS, concrete definite process comprises: source base station or target BS are according to information mutual on X2 interface, and can the judgement target BS directly set up direct tunnel with LGW.

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

When SGW changed, target SGW sent by PGW and revises the carrying request, being notified to LGW from the Target cell or the base station information of target mobile management unit;

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

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

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

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

The judged result that determines whether to use direct tunnel is for can use direct tunnel, and this method further comprises:

Mobile management unit is notified to LGW after obtaining judged result, sets up described direct tunnel.

In the tracing section updating or service request process of UE, the functional entity that determines whether to use 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 definite process comprises: can the sub-district that current UE inserts that LGW reports according to mobile management unit or the information of base station be judged and be set up direct tunnel with the base station that current UE is inserted;

Mobile management unit does not change and when being determined whether to use direct tunnel by mobile management unit, concrete definite process comprises: sub-district or the information of base station and the information of LGW that mobile management unit inserts according to UE, can set up direct tunnel between judgement base station that current UE inserted and the LGW; Perhaps,

Mobile management unit changes and when being determined whether to use direct tunnel by the source mobile management unit, concrete definite process comprises: can the source mobile management unit be judged between target BS and the LGW and be set up direct tunnel according to the information of Target cell or base station and the information of LGW;

Mobile management unit changes and when being determined whether to use direct tunnel by the target mobile management unit, concrete definite process comprises: the information of the sub-district that the target mobile management unit inserts according to current UE or the information of base station and the LGW that obtains from source base station, and judge between base station and the LGW and can set up direct tunnel;

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

When being determined whether to use direct tunnel by LGW, the process of obtaining described wireless side net element information comprises: mobile management unit sends the change in location notice by SGW, PGW to LGW, reports LGW with sub-district or base station information with the current access of UE;

Mobile management unit does not change and when being determined whether to use direct tunnel by mobile management unit, the process of obtaining described wireless side net element information comprises: mobile management unit obtains the sub-district that UE inserts or the information of base station from tracing section updating request or service request;

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

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

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

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

A kind of device of realizing Route Selection, this device comprise direct tunnel decision information maintenance unit, direct tunnel decision package; Wherein,

Described direct tunnel decision information maintenance unit is used for the wireless side network element that will insert at UE, obtains and direct relevant this wireless side net element information and the LGW information in tunnel;

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

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

The UE handoff procedure;

The tracing section updating of UE or service request process.

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

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

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

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

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

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

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

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

When SGW changed, described direct tunnel decision information maintenance unit was used for sending the carrying request of revising by target SGW, PGW, giving described direct tunnel decision package from the location information notification of target mobile management unit;

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

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

When described direct tunnel decision package is arranged in the target BS, described direct tunnel decision information maintenance unit is used to know the variation of UE on-position and has local the connection to exist, and sends the handoff request message of the bearer context information that carries UE to described direct tunnel decision package;

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

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

The judged result that determines whether to use direct tunnel is for can use direct tunnel, and this device further comprises direct tunnel performance element;

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

Described direct tunnel performance element is used to set up described direct tunnel.

Described direct tunnel performance element is arranged among the LGW.

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

LGW, mobile management unit, base station.

When described direct tunnel decision package is arranged among the LGW, be used for: judge and to set up direct tunnel with the base station that current UE is inserted according to the positional information that mobile management unit reports;

Mobile management unit does not change and described direct tunnel decision package when being arranged in the mobile management unit, is used for: the information of the base station of inserting according to UE, and judge between base station that current UE inserted and the LGW and can set up direct tunnel; Perhaps,

Can mobile management unit changes and described direct tunnel decision package when being arranged in the mobile management unit of source, be used for: according to the information of Target cell or base station, judge between target BS and the LGW and set up direct tunnel;

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

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

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

Mobile management unit changes and described direct tunnel decision package when being arranged in the mobile management unit of source, 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 was arranged in the base station, described direct tunnel decision information maintenance unit was 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 among the LGW.

When described direct tunnel decision package determines whether to use direct tunnel, be used for considering to setting up the gateway information that concerns the table of comparisons comprising of direct tunnel.

The present invention realizes method of routing and device, can judge whether that needs are that UE sets up direct tunnel according to the contents such as system information in the practical application scene flexibly, therefore can obviously improve the transfer of data flexibility, and also can guarantee the high efficiency of data passes as far as possible.

Description of drawings

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

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

Fig. 3 is one of LTE home base station network configuration diagram;

Fig. 4 is two of a LTE home base station network configuration diagram;

Fig. 5 is three of a LTE home base station network configuration diagram;

Fig. 6 is for realizing one of local network architecture schematic diagram that inserts;

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 the 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 the target mobile management unit;

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

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

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

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

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

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

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

Embodiment

In actual applications, if LTE inserts, then the 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 comprising the framework of home base-station gateway, then message transmitted also needs to pass through home base-station gateway between base station and the mobile management unit, but home base-station gateway can not revised parameter related to the present invention, therefore this framework is not carried out specified otherwise here.In addition, if UTRAN/GERAN inserts, then the base station refers to RNC or HNB GW, and mobile management unit refers to SGSN.

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

If switch in same system, as in the LTE intra-system handover, perhaps in the 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 be regarded same network element as, and all between message transmitted can be omitted.Before switching, UE has set up local connection.Set up the expansion tunnel between PGW and the LGW, set up direct tunnel between LGW and the source base station.

Flow process shown in Figure 7 may further comprise the steps:

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

Step 701: after source base station has been selected target BS, send handoff request message, wherein comprise the information such as bearing identification of target BS sign/Target Cell Identifier and target following district/Routing Area Identifier, UE to the source mobile management unit.

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

Step 703: the target mobile management unit judges whether to reselect SGW, and being judged to be in the present embodiment does not need.This locality connection that the target mobile management unit changes according to the UE on-position and exists, judgement need report the positional information of UE to give LGW.The target mobile management unit sends the change in location notice by SGW and PGW to LGW, the positional information of the current access of UE is reported LGW, and the content that reports can comprise target BS sign and/or Target Cell Identifier and/or target following district/Routing Area Identifier.

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

Step 705:LGW is carried on judged result in the change in location push-notification-answer, is notified to the target mobile management unit by PGW and SGW.

Step 706: the target mobile management unit is according to the judged result of LGW, and decision issues the address of SGW and address and the tunnel end of tunnel end sign or LGW identifies to target BS.Can set up direct tunnel if LGW judges, then the target mobile management unit is handed down to target BS with address and the tunnel end sign of LGW; Can't set up direct tunnel if LGW judges, then the target mobile management unit is handed down to target BS with address and the tunnel end sign of SGW.

Step 707: the target mobile management unit sends handoff request message, the bearer context information of wherein carrying UE to target BS.Can set up direct tunnel if LGW judges, then the target mobile management unit is handed down to target BS with address and the tunnel end sign of LGW; Can't set up direct tunnel if LGW judges, then the target mobile management unit is handed down to target BS with address and the tunnel end sign of SGW.

Carry out after this process and switch the residue flow process of preparing.Institute's abridged process is a prior art in the middle of step 707 and the step 708, is known in those skilled in the art, and irrelevant with the present invention, does not do here and gives unnecessary details.

Step 708:UE switches to objective network, sends to target BS and switches the request of finishing.

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

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

Step 711: if judgement can be set up direct tunnel before, then the target mobile management unit is revised the carrying request to the SGW transmission, and the user's face address and the tunnel end that wherein carry target BS identify and notify SGW above-mentioned address to be sent to the indication of LGW.

Cannot set up direct tunnel if be judged as before, then the target mobile management unit sends to SGW and revises the carrying request, wherein carries the user's face address and the tunnel end sign of target BS, but does not need to indicate SGW that above-mentioned address is sent to LGW.In this case, do not need execution in step 712 to step 713, directly execution in step 714 gets final product.

Step 712:SGW revises the carrying request to the PGW transmission, wherein carries the user's face address and the tunnel end sign of target BS and notifies PGW above-mentioned address to be sent to the indication of LGW.

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

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

The remaining step that follow-up execution is switched, the abridged process is a prior art, is known in those skilled in the art, and irrelevant with the present invention, does not do here and gives unnecessary details.

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

If in same system, switch, as: in the LTE system or the 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 be regarded same network element as, and all between message transmitted can be omitted.Before switching, UE has set up local connection.Set up the expansion tunnel between PGW and the LGW, set up direct tunnel between LGW and the source base station.

Flow process shown in Figure 8 compares with Fig. 7, and to have taken place to change the step of carrying out slightly different because of SGW, and mainly difference is following steps:

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

Step 804 sends to revise to carry by PGW to step 805: target SGW and asks, giving LGW from the above-mentioned location information notification of target mobile management unit.

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

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

The processing of subsequent step and Fig. 7 corresponding steps are similar, and promptly step 808 is similar to step 714 to step 817 and step 706, does not do here and gives unnecessary details.

Referring to Fig. 9, 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.Flow process shown in Figure 9 is applicable in the LTE connecting system to be switched between switching, UTRAN/GERAN intra-system handover or LTE and the UTRAN/GERAN system.

Flow process shown in Figure 9 may further comprise the steps:

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

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

Can step 902: source base station sends handoff request message to the source mobile management unit, wherein comprise the indication information that set up direct tunnel between the bearing identification of target BS sign/Target Cell Identifier and target following district/Routing Area Identifier, UE and target BS and the LGW etc.

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

Step 904: if can't set up direct tunnel between source base station indication LGW and the target BS, then the source mobile management unit sends to the target mobile management unit and transmits RELOCATION REQUEST message, wherein carries the contextual information of UE.Because UE set up local connection, then also need to comprise information such as the address of SGW and tunnel end sign in the contextual information, but do not comprise the relevant information of LGW.The subsequent step in the existing switching flow is carried out in the succeeding target base station, and this process is a prior art, is known in those skilled in the art, and irrelevant with the present invention, does not do here and gives unnecessary details.

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

Step 905: the target mobile management unit judges whether to reselect SGW, and being judged to be in the present embodiment does not need.The target mobile management unit issues the address of SGW according to the indication information decision that can set up direct tunnel and address and the tunnel end of tunnel end sign or LGW identifies to target BS.

Step 906: the target mobile management unit sends handoff request message, the bearer context information of wherein carrying UE to target BS.If can set up direct tunnel, then the target mobile management unit is handed down to target BS with address and the tunnel end sign of LGW; If can't set up direct tunnel, then the target mobile management unit is handed down to target BS with address and the tunnel end sign of SGW.

Step 907: carry out and switch the residue flow process of preparing.This process is a prior art, is known in those skilled in the art, and irrelevant with the present invention, does not do here and gives unnecessary details.

Step 908 is similar to step 714 to the step 708 among step 914 and Fig. 7, does not do here and gives unnecessary details.

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.It is target SGW that step 911 relates to the SGW that transmits target BS to the step 914.SGW changes other hand off signaling that caused may be different with present embodiment, but do not relate to content involved in the present invention, do not do here and give unnecessary details.

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

Flow process shown in Figure 10 may further comprise the steps:

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

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

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

Step 1004: can't set up direct tunnel if the source mobile management unit is judged between LGW and the target BS, then the source mobile management unit sends to the target mobile management unit and transmits RELOCATION REQUEST message, wherein carries the contextual information of UE.Because UE set up local connection, then also need to comprise information such as the address of SGW and tunnel end sign in the contextual information, but do not comprise the relevant information of LGW.The subsequent step in the existing switching flow is carried out in the succeeding target base station, and this process is a prior art, is known in those skilled in the art, and irrelevant with the present invention, does not do here and gives unnecessary details.

Can set up direct tunnel if the source mobile management unit is judged between LGW and the target BS, then the source mobile management unit sends to the target mobile management unit and transmits RELOCATION REQUEST message, wherein carries the contextual information of UE.Because UE has set up local connection, then also need to comprise address and tunnel end sign, the address of LGW and the indication information that the tunnel end identified and can set up direct tunnel etc. of SGW in the contextual information.

Step 1005: the target mobile management unit judges whether to reselect SGW, and being judged to be in the present embodiment does not need.The target mobile management unit issues the address of SGW according to the indication information decision that can set up direct tunnel and address and the tunnel end of tunnel end sign or LGW identifies to target BS.

Step 1006: the target mobile management unit sends handoff request message, the bearer context information of wherein carrying UE to target BS.If can set up direct tunnel, then the target mobile management unit is handed down to target BS with address and the tunnel end sign of LGW; If can't set up direct tunnel, then the target mobile management unit is handed down to target BS with address and the tunnel end sign of SGW.

Step 1007: carry out and switch the residue flow process of preparing.This process is a prior art, is known in those skilled in the art, and irrelevant with the present invention, does not do here and gives unnecessary details.

Step 1008 is similar to step 714 to step 1014 and step 708, does not do here and gives unnecessary details.

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.It is target SGW that step 1011 relates to the SGW that transmits target BS to the step 1014.SGW changes other hand off signaling that caused may be different with present embodiment, but do not relate to content involved in the present invention, do not do here and give unnecessary details.

Referring to Figure 11, 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.Flow process shown in Figure 11 is applicable in the LTE connecting system to be switched between switching, UTRAN/GERAN intra-system handover or LTE and the UTRAN/GERAN system.

Flow process shown in Figure 11 may further comprise the steps:

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

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

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

Step 1103: the target mobile management unit judges whether to reselect SGW, and being judged to be in the present embodiment does not need.The target mobile management unit is known the variation of UE on-position and is had local the connection to exist, therefore send the handoff request message of the bearer context information that carries UE to target BS, comprising the address of SGW and address and the tunnel end sign of tunnel end sign and LGW.

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

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

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

Carry out after this process and switch the residue flow process of preparing.The abridged process is a prior art in the middle of the step 1105 and 1106, is known in those skilled in the art, and irrelevant with the present invention, does not do here and gives unnecessary details.

Step 1106:UE switches to objective network, sends to target BS and switches the request of finishing.

Step 1107: target BS sends the switching notice request to the target mobile management unit, and the Base Station Identification and/or the tracking area fine jade that wherein carry the current access of UE are identified by the address of distinguishing sign and/or cell ID and target BS and user's face tunnel end.

In addition can also carry the indication information that whether can set up direct tunnel.If carried 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 do here and gives unnecessary details.

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.It is target SGW that step 1109 relates to the SGW that transmits target BS to the step 1112.SGW changes other hand off signaling that caused may be different with present embodiment, but do not relate to content involved in the present invention, do not do here and give unnecessary details.

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

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

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

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

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

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

In addition, if judging between LGW and the target BS, the target mobile management unit can't set up direct tunnel, then the target mobile management unit sends to the target mobile management unit and transmits RELOCATION REQUEST message, wherein carry the contextual information of UE, wherein need to comprise information such as the address of SGW and tunnel end sign, but do not comprise the relevant information of LGW.The subsequent step in the existing switching flow is carried out in the succeeding target base station, and this process is a prior art, is known in those skilled in the art, and irrelevant with the present invention, does not do here and gives unnecessary details.

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

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

Step 1206 performed after this process is similar to step 714 to step 1212 and step 708, does not do here and gives unnecessary details.

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.It is target SGW that step 1209 relates to the SGW that transmits target BS to the step 1212.SGW changes other hand off signaling that caused may be different with present embodiment, but do not relate to content involved in the present invention, do not do here and give unnecessary details.

Referring to Figure 13, Figure 13 is in the interior X2 handoff procedure of the LTE connecting system of one embodiment of the invention, carries out the flow chart of Route Selection.Flow process shown in Figure 13 is applicable in the LTE connecting system to be switched.Before switching, UE has set up local connection.Set up the expansion tunnel between PGW and the LGW, set up direct tunnel between LGW and the source base station.

Flow process shown in Figure 13 may further comprise the steps:

Step 1301: source base station is initiated switching flow.Because directly there are X2 interface in source base station and target BS, therefore can pass through X2 interface interacting message information each other between the two, and finish wireless resource reservation.After this process was carried out, UE had switched to target BS.

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

Step 1302: can target BS wherein carry the indication information that set up direct tunnel to mobile management unit transmit path conversion request message.

Step 1303: mobile management unit judges how to carry out subsequent step according to the information that whether can set up direct tunnel that obtains.Mobile management unit needs also to judge whether SGW needs to change, and being judged as here needs to change.

Step 1304: if judgement can be set up direct tunnel before, then mobile management unit sends to target SGW and creates conversation request, wherein carries the user's face address and the tunnel end sign of target BS and notifies SGW above-mentioned address to be sent to the indication of LGW.

Cannot set up direct tunnel if be judged as before, then the target mobile management unit sends to SGW and revises the carrying request, wherein carries the user's face address and the tunnel end sign of target BS, but does not need to indicate SGW that above-mentioned address is sent to LGW.In this case, do not need execution in step 1305 to step 1307, but direct execution in step 1308.

Step 1305: target SGW revises the carrying request to the PGW transmission, wherein carries the user's face address and the tunnel end sign of target BS and notifies PGW above-mentioned address to be sent to the indication of LGW.

Step 1306:PGW sends to LGW and revises the carrying request, wherein carries the user's face address and the tunnel end sign of target BS.The above-mentioned information that the LGW basis is received is set up the direct tunnel between LGW and the target BS.

Step 1307:LGW returns the modification 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 the step 1303 and can set up direct tunnel, then comprise address and the tunnel end sign of LGW in this message.

If judge in the step 1303 and can not set up direct tunnel, then comprise address and the tunnel end sign of SGW in this message.

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

In the present embodiment, be equally applicable to the constant flow process of SGW.If SGW is constant, then two message in step 1304 and the step 1308 are respectively to revise the carrying request and revise the carrying response, and the delivery of content that the present invention relates to still similarly.In this case, step 1310 need not to carry out.

Referring to Figure 14, Figure 14 is in the tracing section updating or service request process of one embodiment of the invention, is 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 the 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 set up local connection.Set up the expansion tunnel between PGW and the LGW.

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

Step 1403: this locality connection that mobile management unit changes according to the UE on-position and exists, judgement need report the positional information of UE to give LGW.Mobile management unit sends the change in location notice by SGW, PGW to LGW, reports LGW with the positional information with the current access of UE, and the content that reports can comprise the access base station sign and/or insert cell ID and/or insert tracking area/Routing Area Identifier.

Can the positional information that step 1404:LGW reports according to mobile management unit be judged and be set up direct tunnel with the base station that current UE is inserted.

Step 1405:LGW is carried on judged result in the change in location push-notification-answer, is notified to mobile management unit by PGW, SGW.

Step 1406: mobile management unit is according to the judged result of LGW, and decision issues the address of the address of SGW and tunnel end sign or LGW and tunnel end and identifies base station to current access.

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

Can set up direct tunnel if LGW judges, then comprise address and the tunnel end sign of LGW in the contextual information of UE; Can't set up direct tunnel if LGW judges, then comprise address and the tunnel end sign of SGW in the contextual information of UE.

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

Step 1409 to 1413 with step 710 similar to step 714, do not do here and give unnecessary details.

The remaining step of follow-up execution tracing section updating or service request, the abridged process is a prior art, is known in those skilled in the art, and irrelevant with the present invention, does not do here and gives unnecessary details.

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

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

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

It is target SGW that step 1410 relates to the SGW that transmits target BS to the step 1413.SGW changes other hand off signaling that caused may be different with present embodiment, but do not relate to content involved in the present invention, do not do here and give unnecessary details.

Further, present embodiment also is useful in the scene that mobile management unit changes in tracking area/Routing Area Update process.If mobile management unit changes, what then the mobile management unit among the figure referred to all is the target mobile management unit, between source mobile management unit and the target mobile management unit is technology known in those skilled in the art alternately, and irrelevant with the present invention, does not here do and gives unnecessary details.

Referring to Figure 15, Figure 15 is in the tracing section updating or service request process of one embodiment of the invention, is 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 the 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 set up local connection.Set up the expansion tunnel between PGW and the LGW.

Flow process shown in Figure 15 may further comprise the steps:

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

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

Step 1503: can't set up direct tunnel if mobile management unit is judged, then mobile management unit sends initial context to the base station that UE inserts and sets up request, wherein carries the contextual information of UE.Because UE set up local connection, then also need to comprise information such as the address of SGW and tunnel end sign in the 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 a prior art, is known in those skilled in the art, and irrelevant with the present invention, does not do here and gives unnecessary details.

Can set up direct tunnel if mobile management unit is judged, then mobile management unit sends initial context to the base station that UE inserts and sets up request, wherein carries the contextual information of UE.Because UE has set up local connection, then also need to comprise address and the tunnel end sign of LGW in the contextual information.

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

Step 1505 is similar to step 714 to step 1508 and step 711, does not do here and gives unnecessary details.

In the present embodiment if tracing section updating is 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.It is target SGW that step 1505 relates to the SGW that transmits target BS to the step 1508.SGW changes other hand off signaling that caused may be different with present embodiment, but do not relate to content involved in the present invention, do not do here and give unnecessary details.

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

Referring to Figure 16, Figure 16 is in the tracing section updating or service request process of one embodiment of the invention, is carried out the flow chart of Route Selection by the base station.Flow process shown in Figure 16 is applicable to the tracing section updating process that service request process in the 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 set up local connection.Set up the expansion tunnel between PGW and the LGW.

Flow process shown in Figure 16 may further comprise the steps:

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

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

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

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

Step 1606 is not done here and is given unnecessary details to step 1610 and similar to step 714 with step 710.

In the present embodiment if tracing section updating is 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.It is target SGW that step 1607 relates to the SGW that transmits target BS in 1610.SGW changes other hand off signaling that caused may be different with present embodiment, but do not relate to content involved in the present invention, do not do here and give unnecessary details.

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

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

Flow process shown in Figure 17 may further comprise the steps:

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

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

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

Step 1705: can't set up direct tunnel if the source mobile management unit is judged, then the source mobile management unit sends context response information to the target mobile management unit, wherein carries the contextual information of UE.Because UE set up local connection, then also need to comprise information such as the address of SGW and tunnel end sign in the contextual information, but do not comprise the relevant information of LGW.The subsequent step of the existing tracking area of follow-up execution/Routing Area Update flow process, this process is a prior art, is known in those skilled in the art, and irrelevant with the present invention, does not do here and gives unnecessary details.

Can set up direct tunnel if the source mobile management unit is judged, then the source mobile management unit sends context acknowledge message to the target mobile management unit, wherein carries the contextual information of UE.Because UE has set up local connection, then also need to comprise address and tunnel end sign, the address of LGW and the indication information that the tunnel end identified and can set up direct tunnel etc. of SGW in the contextual information.

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

If the tracing section updating process also needs for UE sets up radio bearer, then need execution in step 1707 to step 1708; Otherwise can skips steps 1707 and step 1708 step, directly carry out follow-up flow process.

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

Step 1709 is similar to step 714 to step 1713 and step 710, does not do here and gives unnecessary details.

In the present embodiment if tracking area/Routing Area Update is 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.It is target SGW that step 1710 relates to the SGW that transmits target BS to the step 1713.SGW changes other hand off signaling that caused may be different with present embodiment, but do not relate to content involved in the present invention, do not do here and give unnecessary details.

In conjunction with above flow process as can be known, the present invention realizes that the technical thought of Route Selection can represent as shown in figure 18.Referring to Figure 18, Figure 18 is the general flow chart of the realization Route Selection of one embodiment of the invention, and this flow process may further comprise the steps:

Step 1810:, obtain and relevant this wireless side net element information and the LGW information in direct tunnel at the wireless side network element that UE will insert.Described wireless side net element information comprise following one of at least: closed user group id, 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:, determine whether between described wireless side network element and LGW, to use direct tunnel according to wireless side net element information that is obtained and LGW information.Concrete definite method has multiple, as: according to wireless side net element information that is obtained and LGW information, search the pairing tunnel of the above-mentioned information of obtaining in the gateway information such as the table of comparisons and set up configuration can setting up concerning of direct tunnel, set up configuration by the tunnel that finds and know whether can use direct tunnel.

Above-mentioned gateway information can be local static configuration, or dynamically issues by operator's management system, or by obtaining to other network elements inquiries.Described other network elements include but not limited to dns server, operator's configuration management system etc.

Step 1830: when determining to use direct tunnel, between described wireless side network element and LGW, set up the direct tunnel of supporting that UE communicates by letter.

In actual applications, in order to realize the above flow process smoothly, can carry out setting as shown in figure 19.Referring to Figure 19, Figure 19 is the installation drawing of the realization Route Selection of one embodiment of the invention, and this device comprises continuous direct tunnel decision information maintenance unit, direct tunnel decision package, direct tunnel performance element.Each unit can divide if close and be located at each position in the network, as long as can realize various functions smoothly and realize Route Selection.

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

Directly the tunnel decision package can determine whether to use direct tunnel between described wireless side network element and LGW, and notify direct tunnel performance element according to wireless side net element information of receiving and LGW information.

Directly the tunnel performance element is when directly the tunnel decision package is determined to use direct tunnel, according to setting up the direct tunnel of supporting that UE communicates by letter from the notice of direct tunnel decision package between described wireless side network element and the LGW.

The specific operation process that above-mentioned each operating unit can be realized is described in detail in aforementioned flow process, does not repeat them here.

In sum as seen, no matter be method or device, the present invention realizes that the technology of Route Selection can judge whether that needs are that UE sets up direct tunnel flexibly according to the contents such as system information in the practical application scene, therefore can obviously improve the transfer of data flexibility, and also can guarantee the high efficiency of data passes as far as possible.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims

1. realize method of routing for one kind, it is characterized in that this method comprises:

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

2. method according to claim 1 is characterized in that, the operation that determines whether to use direct tunnel is to carry out in following process one of at least:

The UE handoff procedure;

3. method according to claim 2 is characterized in that, in the UE handoff procedure, the functional entity that determines whether to use direct tunnel be following one of at least:

4. method according to claim 3 is characterized in that:

5. method according to claim 4 is characterized in that:

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

6. according to each described method of claim 3 to 5, it is characterized in that the judged result that determines whether to use direct tunnel is for can use direct tunnel, this method further comprises:

7. method according to claim 2 is characterized in that, in the tracing section updating or service request process of UE, the functional entity that determines whether to use direct tunnel be following one of at least:

LGW, mobile management unit, base station.

8. method according to claim 7 is characterized in that:

9. method according to claim 8 is characterized in that:

10. according to each described method of claim 7 to 9, it is characterized in that the judged result that determines whether to use direct tunnel is for can use direct tunnel, this method further comprises:

11. method according to claim 1 and 2 is characterized in that, when determining whether to use direct tunnel, the LGW that can set up direct tunnel and the table of comparisons that concerns of wireless side network element is considered.

12. a device of realizing Route Selection is characterized in that, this device comprises direct tunnel decision information maintenance unit, direct tunnel decision package; Wherein,

13. device according to claim 12 is characterized in that, described direct tunnel decision package determines whether to use the operation in direct tunnel, is to carry out in following process one of at least:

The UE handoff procedure;

The tracing section updating of UE or service request process.

14. device according to claim 13 is characterized in that, in the UE handoff procedure, described direct tunnel decision package be arranged at following functional entity one of at least in:

15. device according to claim 14 is characterized in that:

16. device according to claim 15 is characterized in that:

17., it is characterized in that the judged result that determines whether to use direct tunnel is for can use direct tunnel according to each described device of claim 14 to 16, this device further comprises direct tunnel performance element;

18. device according to claim 17 is characterized in that, described direct tunnel performance element is arranged among the LGW.

19. device according to claim 13 is characterized in that, in the tracing section updating or service request process of UE, described direct tunnel decision package be arranged at following functional entity one of at least in:

LGW, mobile management unit, base station.

20. device according to claim 19 is characterized in that:

21. device according to claim 20 is characterized in that:

22., it is characterized in that the judged result that determines whether to use direct tunnel is for can use direct tunnel according to each described device of claim 19 to 21, this device further comprises direct tunnel performance element;

23. device according to claim 22 is characterized in that, described direct tunnel performance element is arranged among the LGW.

24. according to claim 12 or 13 described devices, it is characterized in that, when described direct tunnel decision package determines whether to use direct tunnel, be used for considering to setting up the gateway information that concerns the table of comparisons comprising of direct tunnel.