CN101572865A

CN101572865A - Method for supporting MME repositioning

Info

Publication number: CN101572865A
Application number: CNA2008101103512A
Authority: CN
Inventors: 许丽香; 王弘; 李小强
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2008-04-29
Filing date: 2008-06-04
Publication date: 2009-11-04

Abstract

The invention relates to a method for supporting mobile management entity (MME) repositioning, which comprises the following steps that: a first MME sends a repositioning request message to a second MME, wherein the message contains routing information of a wireless network control node to which user equipment belongs; the second MME sends a switching request message to the network control node marked by the routing information; the network control node returns a switching request confirmation message to the second MME; the second MME sends a repositioning response message to the first MME; the first MME sends a switching command message to the network control node; and the network control node finishes the repositioning process from the user equipment to the second MME. The method can be used for load re-balancing, and reduce the prior signaling process, improve the efficiency, save the consumption of the UE, reduce potential error processing at the UE end, and brings no problems of compatibility and adverse effects when the method is used for the load re-balancing.

Description

Support the method for MME reorientation

Technical field

The present invention relates to the communications field, particularly, relate to the method for a kind of MME of support (mobile management entity) reorientation.

Background technology

The system configuration of SAE (system architecture evolution, System architecture evolution) as shown in Figure 1.Be description below to Fig. 1 SAE system configuration.

101 subscriber equipmenies (hereinafter to be referred as UE) are the terminal equipments that is used for receiving data.102EUTRAN is the Radio Access Network among the evolution system SAE, also can be eNB, be responsible for providing the interface of access of radio network, and be connected by the S1 interface with user plane entity 104 Serving Gateway with the mobile management entity 103MME of mobile phone to LTE (Long Term Evolution) mobile phone.103MME is in charge of mobile context, the session context of subscriber equipment, preserves user and security-related information.104 Serving Gateway (Serving GW) mainly provide the function of user plane.S1-MME interface is responsible for providing RAB to set up to UE, and UE is sent to the forwarding of the message of MME from wireless access network.

Some is similar for function that 103MME and 104 Serving Gateway combine and original 106SGSN (GPRS (hereinafter to be referred as GPRS) support node), and MME and Serving Gateway might be in same physical entity.105PDNGateway is responsible for functions such as charging, Lawful Interception.Serving Gateway and PDN Gateway might be in same physical entity.106SGSN is that the transmission for data provides route among the present UMTS.Existing SGSN finds corresponding Gateway GPRS Support Node (hereinafter to be referred as GGSN) according to access point name (hereinafter to be referred as APN).107HSS is the local ownership subsystem of subscriber equipment, it is responsible for preserving user's information, comprises the current location of subscriber equipment, the address of service node, user's security-related information, packet data protocol (hereinafter to be referred as PDP) context that subscriber equipment activates or the like.108PCRF provides Qos policy and charging criterion by the S7 interface.

Usually, customer traffic is to 104 ServingGateway through 105PDN Gateway, Serving Gateway sends to the eNB at UE place to data by GPRS Tunnel Protocol (hereinafter to be referred as GTP) passage, and eNB sends to corresponding user equipment to data.

Fig. 2 is the structure of S1 interface among the SAE, and EPC (packet core network of evolution, Evolvedpacket core) is the core network of evolution.Wherein each eNB links to each other with a plurality of MME in MME pond (Pool).Each eNB links to each other with a plurality of S-GW among the S-GW Pool.

UE switches the MME repositioning process as shown in Figure 3 in the prior art between eNB.If Serving GW does not have reorientation, the function of the source Serving GW among the figure is exactly the function of purpose Serving GW.

The process of switched core network node reorientation between eNB is initiated in 301 source eNB decision.This can trigger under the situation that does not have X2 interface between source eNB and target eNB, perhaps receives the mistake indication that comes from purpose eNB after unsuccessful X2 switches, perhaps the multidate information of source eNB grasp.

302 source eNB send " switching demand " message and give source MME.Comprise the indication that source eNB whether can immediate data transmits to purpose eNB in the described message.Handoff requirement message comprises following information element:

√ MME UE S1AP ID (MME UE S1 Application Part sign)

√ eNB UE S1AP ID (eNB UE S1 Application Part sign)

√ switching type＜comprising: IntraLTE (LTE inside), LTEtoUTRAN (LTE is to UTRAN), LTEtoGERAN (LTE is to GERAN) 〉

The √ reason

√ source sign

√ purpose sign

The availability that the √ immediate data is transmitted

√ Intra-LTE handover information list request (this information element is opportunistic, exists when IntraLTE switches) comprises the transparent vessel (container) of source eNB to purpose eNB.

The information list request that √ LTE switches to UTRAN (this information element is opportunistic, exists when LTEtoUTRAN switches).

√ LTE is to GERAN handover information list request (this information element is opportunistic, exists when LTEtoGERAN switches)

303 source MME select purpose MME and send " forwarding re-positioning request " message to give purpose MME.Here the detailed description of ignoring selection function.Transmit in the RELOCATION REQUEST message and comprise MME UE context.MME UE context comprises PDNGW address and the TEIDs (this is for the S5 based on GTP, the situation of S8 interface) that is used for the upstream data transmission and is used for address and the TEIDs of the Serving GW of upstream data transmission.Also comprise the indication whether immediate data is transmitted in the described message, perhaps the source end is set up the carrying of non-direct forwarding.Switching type in the described message, switch reasons switches because be that LTE is inner, also comprises the container of source eNB to purpose eNB.

304 purpose MME verify whether source Serving GW can continue to serve this UE.If can not, purpose MME selects a new Serving GW.Here the detailed description of ignoring selection function.Purpose MME sends and " creates the carrying request information and give purpose ServingGW.If source Serving GW continues this UE of service, Serving GW in source is the same with purpose Serving GW so, and the message of this step does not need." comprise bearer context in the establishment carrying request information, as PDN GW address and TEIDs (this is for the S5 based on GTP, the situation of S8 interface).Purpose Serving GW distributes S-GW address and TEIDs to be used for the transmission of S1 interface upstream data.At 304a, purpose Serving GW sends " creating the carrying response " message and gives purpose MME.Message comprises ServingGW address and up TEIDs " to create the carrying response ".

305 purpose MME send " handoff request " message and give purpose eNB.Comprise Serving GW address and up TEIDs in " handoff request " message.After purpose eNB receives described message, create the UE context, comprise carrying and safe context at purpose eNB.Switching type is set to IntraLTE in the described message.Handoff request message contains following information element:

√ MME UE S1AP ID (MME UE S1 Application Part sign)

The √ reason

The SAE carrying tabulation that √ will set up

√ Intra-LTE (LTE inside) handover information list request (this information element is opportunistic, exists when IntraLTE switches) comprises the transparent vessel (container) of source eNB to purpose eNB.

The information list request that √ UTRAN switches to LTE (this information element is opportunistic, exists when UTRANtoLTE switches).

√ GERAN is to LTE handover information list request (this information element is opportunistic, exists when GERANtoLTE switches)

The PLMN of √ service

√ switches the restriction tabulation

At 305a, purpose eNB sends " Handover Request Acknowledge " message and gives purpose MME.Described message comprises the address and the TEIDs that are used for the transmission of S1 interface downlink data that purpose eNB distributes.。

If 306 use non-immediate data to transmit, purpose MME sets up the retransmitting paramater of purpose Serving GW.

307 purpose MME send " forwarding relocation response " message and give source MME.Comprise the indication (new ServingGW has been selected in indication) whether Serving GW changes in the described message.If use non-immediate data to transmit, also comprise the Serving GW address and the TEIDs that are used for data forwarding in the described message.

If 308 use non-immediate data to transmit, source MME upgrades the passage that is used for data forwarding of source Serving GW.If Serving GW by reorientation, creates the channel number that also covers purpose Serving GW in the bearing request message.

309 source MME send " switching command " message and give source eNB.Comprise destination address that is used for data forwarding and TEIDs that purpose eNB distributes in the described message.Switching command message comprises following information element:

√ MME UE S1AP ID (MME UE S1 Application Part sign)

√ eNB UE S1AP ID (eNB UE S1 Application Part sign)

√ needs the carrying tabulation of data forwarding

The SAE carrying tabulation that √ need discharge

√ Intra-LTE (LTE inside) handover information list response (this information element is opportunistic, exists when IntraLTE switches) comprises the transparent vessel (container) of purpose eNB to source eNB.

The information list response that √ LTE switches to UTRAN (this information element is opportunistic, exists when LTEtoUTRAN switches).

√ LTE is to GERAN handover information list response (this information element is opportunistic, exists when LTEtoGERAN switches)

310 source eNB send " switching command " message and give UE.The wireless resource configuration that comprises the purpose sub-district in " switching command " message.

311 for the carrying that needs data forwarding, and source eNB begins the data of converting downlink and gives purpose eNB.Can be direct data forwarding (311a) or non-direct data forwarding (311b).

After 312UE is synchronized to the purpose sub-district, send " switch and confirm " message and give purpose eNB.Purpose eNB can send the downlink data that forwards to UE.Same UE can send up data.

313 purpose eNB send " switching notice " message and give purpose MME.

314 purpose MME send " transmitting reorientation finishes " message and give source MME.Source MME sends response " affirmation is finished in reorientation " message and gives purpose MME.

" more the new bearer request information is given purpose Serving GW in 315 purpose MME transmission.Comprise the eNB address and the TEIDs that are used for the transmission of S1 interface downlink data that purpose eNB distributes in the described message, and be used for PDN GW address and the TEIDs (this is for the S5 based on GTP, the situation of S8 interface) that upstream data sends.

If 316 Serving GW reorientations, purpose Serving GW branch are used in PDN GW and are used for address and the TEIDs that downlink data sends." more the new bearer request information is given PDN GW in purpose Serving GW transmission.Comprise Serving GW address and TEIDs in the described message.316b PDN GW upgrades contextual information, sends " more new bearer response " message and gives purpose Serving GW.PDN GW begins to send downlink data to purpose Serving GW.If Serving GW does not have reorientation, the message of this step does not need.Serving GW directly sends data to purpose eNB.

317 purpose Serving GW send " more new bearer response " message and give purpose MME.Comprise PDN GW address and TEIDs (this is for the S5 based on GTP, the situation of S8 interface) in the described message.

318UE initiates tracking area update (being called for short TAU) process.Here ignore detailed record explanation.

This process can be used for the load rebalancing method, and source eNB is the same with purpose eNB when being used for the load rebalancing method.When being used for the load rebalancing method, source MME sends " handover trigger " message and gives eNB, and eNB initiates the handoff procedure (301 step) of S1 interface then.

In order to support MME load balancing or MME overload control, need to support that UE changes the MME that serves this UE under the situation of not switching eNB.This is the scene that the present invention uses, and this is not precluded within also needs to support the repositioning process of UE between the different MME of same eNB in the future under some scenes.

When the S1 handoff procedure is used for the load rebalancing method, simply increase source MME and send " handover trigger " message to eNB, the scheme of the handoff procedure of eNB initiation S1 interface is not a kind of scheme of optimization then, exists a lot of redundant.

1) generally, handoff procedure is initiated (handoff requirement message) by eNB, when handoff procedure is used for the load rebalancing method, needs source MME to initiate this process (handoff trigger message).If source MME initiates handoff procedure, then " switching demand " seems and is not necessary, because all information elements in the switching demand all are known to the MME.

2) switch because be that LTE is inner, in the switching demand, transmit handoff request, handoff request, Handover Request Acknowledge, the switching type in switching command (S1 interface) message is IntraLTE, so all comprises from eNB to eNB the container of (source eNB to purpose eNB or purpose eNB to source eNB), because be the MME reorientation under the same eNB, this container is optional.But according to existing mechanism, because be the switching of LTE inside, if do not comprise this container then can make mistakes.

If in source MME issues " switching command " message of eNB, comprise the container of purpose eNB to source eNB, if do not change the behavior of eNB, eNB passes to UE to this information again, a kind of behavior of UE is to have reconfigured identical resource, synchronous etc., and such operation is the waste of power to UE.The another kind of behavior of UE is, is the same because detect Target cell with the cell-of-origin, and UE may think that switching command (message of air interface) is wrong message, thus the report handoff failure.

Summary of the invention

The present invention proposes a kind of method of the MME of support reorientation, this method can be used for the load rebalancing method, and reduce prior signaling process when being used for the load rebalancing method, raise the efficiency, save the consumption of UE, reduce the potential fault processing of UE end, and the problem and the harmful effect that do not bring any compatibility.

According to an aspect of the present invention, a kind of method of supporting the mobile management entity reorientation comprises step:

First mobile management entity sends RELOCATION REQUEST message to second mobile management entity, comprises the routing iinformation of the wireless network control node at subscriber equipment place in the described message;

Described second mobile management entity sends the network control node that handoff request message is given described routing iinformation sign;

Described network control node returns switching request acknowledgement message and gives second mobile management entity;

Described second mobile management entity sends relocation response message to first mobile management entity;

Described first mobile management entity sends switching command message to described network control node;

Described network control node is finished the repositioning process of described subscriber equipment to second mobile management entity.

According to a further aspect in the invention, a kind of method of supporting the mobile management entity reorientation comprises step:

First mobile management entity sends the network control node of handoff trigger message to the subscriber equipment place, and the reorientation of mobile management entity is carried out in request;

Described network control node sends handoff requirement message to described first mobile management entity;

Described first mobile management entity sends RELOCATION REQUEST message to second mobile management entity, comprises the routing iinformation of described wireless network control node in the described message;

Described network control node is finished the repositioning process of described subscriber equipment to second mobile management entity,

It is characterized in that comprising in described switching demand or RELOCATION REQUEST message or described handoff request or described Handover Request Acknowledge or the described switching command message information element, to indicate this be switching type between the inner different mobile management entities of eNB.

According to another aspect of the present invention, a kind of method of supporting the mobile management entity reorientation comprises step:

First mobile management entity sends handoff notification message to the wireless network control node;

The wireless network control node sends handoff requirement message to described first mobile management entity;

Described first mobile management entity sends second mobile management entity of relocation response message to one of a plurality of mobile management entities;

Described second mobile management entity sends relocation response message to described first mobile management entity;

Described first mobile management entity sends switching response message to described wireless network control node.

Description of drawings

Fig. 1 is the network structure of SAE;

Fig. 2 is the structure of S1 interface;

Fig. 3 is the schematic diagram that switches the MME repositioning process according to prior art UE between eNB;

Fig. 4 is the schematic diagram that switches the MME repositioning process according to the UE of the embodiment of the invention one in eNB inside;

Fig. 5 is the operational flowchart according to the source MME of embodiment one;

Fig. 6 is the operational flowchart according to the purpose MME of embodiment one;

Fig. 7 is the operational motion flow chart according to the eNB of embodiment;

Fig. 8 is the schematic diagram that switches the MME repositioning process according to the UE of the embodiment of the invention two in eNB inside;

Fig. 9 is the schematic diagram that switches the MME repositioning process according to the UE of the embodiment of the invention three in eNB inside;

Figure 10 is the schematic diagram that switches the MME repositioning process according to the UE of the embodiment of the invention four in eNB inside;

Figure 11 is the schematic diagram that switches the MME repositioning process according to the UE of the embodiment of the invention five in eNB inside;

Figure 12 is the schematic diagram that switches the MME repositioning process according to the UE of the embodiment of the invention six in eNB inside;

Figure 13 is the schematic diagram that switches the MME repositioning process according to the UE of the embodiment of the invention seven in eNB inside;

Figure 14 is the schematic diagram that switches the MME repositioning process according to the UE of the embodiment of the invention eight in eNB inside;

Figure 15 is the schematic diagram that switches the MME repositioning process according to the UE of the embodiment of the invention nine in eNB inside.

Embodiment

With the LTE system the specific embodiment of the present invention is described below.But method of the present invention never is limited to the LTE system, also can be applied in 3G (UMTS) system and following mobile communication system simultaneously.Source MME described in following examples is exactly first mobile management entity of indication of the present invention, and purpose MME is exactly second mobile management entity of invention indication, and source eNB and purpose eNB are exactly the network control node of invention indication.

Fig. 4 is a kind of implementation of UE at the inner MME of switching of eNB repositioning process.Be detailed description below, ignored the detailed technical descriptioon that has nothing to do with the present invention here this scheme.In all active eNB of description of the process message that is used for switching of existing S1 interface or the description of purpose eNB, show corresponding and readable with existing standard for clear, also all be the saying that has kept source eNB and purpose eNB in following figure and the description.In fact be same entity for source eNB and purpose eNB in the inner switching of eNB MME repositioning process.This description does not influence the method for invention itself.In description, ignored detailed technical descriptioon same as the prior art to following embodiment.

401 source MME (first mobile management entity) initiate the handoff procedure in the eNB, between MME.Source MME selects purpose MME (second mobile management entity), ignores the detailed description of selection function here.Source MME sends " forwarding re-positioning request " message and gives purpose MME.Transmit in the RELOCATION REQUEST message and comprise MME UE context.MME UE context comprises and is used for PDN GW address that upstream data sends and TEIDs (this is for based on the S5 of GTP, the situation of S8 interface, for the situation based on the S5/S8 of PMIP, the present invention ignores detailed description) and be used for address and the TEIDs of the Serving GW that upstream data sends.Comprise the indication that immediate data is transmitted in the described message.The information element switching type is set to IntraeNBInterMME (switch between different MME eNB inside) in the message.When switching type is IntraeNBInterMME, do not comprise the container of source eNB in the described message to purpose eNB.Optionally, when this handoff procedure was used for the load rebalancing method, the cause value that comprises in the message was set to load balancing.

402 purpose MME verify whether source Serving GW can continue to serve this UE.If can not, purpose MME selects a new Serving GW, and purpose MME sends and " creates the carrying request information and give purpose Serving GW.Here the detailed description of ignoring selection function.If source Serving GW continues this UE of service, Serving GW in source is the same with purpose Serving GW so, and the message of this step does not need." comprise bearer context in the establishment carrying request information, as PDN GW address and TEIDs (this is for the S5 based on GTP, the situation of S8 interface).Purpose Serving GW distributes S-GW address and TEIDs to be used for the transmission of S1 interface upstream data.304a, purpose Serving GW send " creating the carrying response " message and give purpose MME.Message comprises Serving GW address and up TEIDs " to create the carrying response ".

403 purpose MME send " handoff request " message and give purpose eNB.The information element switching type is set to IntraeNBInterMME in the message.When switching type is IntraeNBInterMME, do not comprise the container of source eNB in the described message to purpose eNB.Optionally, when this handoff procedure was used for the load rebalancing method, the cause value that comprises in the message was set to load balancing.If selected new Serving GW, comprise the carrying tabulation that information element need be set up in " handoff request " message, the carrying tabulation that needs to set up comprises bearing identification, the up TEID that transport layer address and new Serving GW distribute.The carrying tabulation that information element need be set up is optional information element.

403a purpose eNB sends " Handover Request Acknowledge " message and gives purpose MME.The information element switching type is set to IntraeNBInterMME in the message.When switching type is IntraeNBInterMME, do not comprise the container of purpose eNB in the described message to source eNB.If comprise the carrying tabulation that information element need be set up in " handoff request " message, comprise carrying in described " Handover Request Acknowledge " message and accept tabulation or carrying failure tabulation.Otherwise tabulation is accepted in the carrying in " Handover Request Acknowledge " message and carrying failure tabulation does not exist.

404 purpose MME send " forwarding relocation response " message and give source MME.

405 source MME send " switching command " message and give source eNB.Switching type is set to IntraeNBInterMME.When switching type is IntraeNBInterMME, do not comprise the container of purpose eNB in the described message to source eNB.When switching type was IntraeNBInterMME, carrying tabulation that the information element in the described message is transmitted and the carrying tabulation that discharges did not exist.

406 source eNB send " switching command " message and give UE.Optionally, can not comprise the wireless resource configuration of purpose sub-district in the described message, for example the configuration information of difference (delta) information is empty.The wireless resource configuration that the source eNB of that is to say sends to Target cell in UE's " switching command " message is optional.This message can only be used to notify the change of UEMME, perhaps triggers the TAU process of UE.ENB sends " switching command " message to behind the UE, can continue to send descending data to UE.Optionally, if UE can know the change of MME by other mode, UE broadcast listening information for example, then 406eNB sends " switching command " message to send " switch and confirm " message for UE and 407UE is omissible step to eNB.

407UE sends " switch and confirm " message and gives purpose eNB.

408 purpose eNB send " switching notice " message and give purpose MME.

409 purpose MME send " transmitting reorientation finishes " message and give source MME.

410 source MME send " transmit reorientation and finish affirmation " and give purpose MME.

411 is optional, if Serving GW reorientation, " more the new bearer request information is given purpose Serving GW in purpose MME transmission.Purpose Serving GW divides address and the TEIDs that is used in the transmission of PDNGW downlink data.

" more the new bearer request information is given PDN GW in 412 purpose Serving GW transmission.Comprise Serving GW address and TEIDs in the described message.412a PDN GW upgrades contextual information, sends " more new bearer response " message and gives purpose Serving GW.PDN GW begins to send downlink data to purpose Serving GW.

If Serving GW does not have reorientation, then do not need 411,412,412a,, the message of 413 steps.Serving GW directly sends data to purpose eNB.413 purpose ServingGW send " more new bearer response " message and give purpose MME.Comprise PDN GW address and TEIDs (this be for based on the S5 of GTP, the situation of S8 interface) in the described message.

Optionally, UE initiates the TAU process.

To should embodiment, wherein the motion flow of source MME as shown in Figure 5.Be detailed description below, ignored the detailed technical descriptioon that has nothing to do with the present invention here this figure.In to the description of MME flow process, still mentioned the notion of source eNB and purpose eNB.This is because eNB corresponding information element source of transmitting in the RELOCATION REQUEST message in source identifies the purpose sign in the corresponding message of purpose eNB.The handoff procedure of corresponding eNB inside, source eNB and purpose eNB are same entities.In description, ignored detailed technical descriptioon same as the prior art to following embodiment.

501 source MME initiate the handoff procedure in the eNB, between MME.Source MME selects purpose MME, ignores the detailed description of selection function here.Source MME sends " forwarding re-positioning request " message and gives purpose MME.Transmit in the RELOCATION REQUEST message and comprise MME UE context.MME UE context comprises and is used for PDN GW address that upstream data sends and TEIDs (this is for based on the S5 of GTP, the situation of S8 interface, for the situation based on the S5/S8 of PMIP, the present invention ignores detailed description) and be used for address and the TEIDs of the Serving GW that upstream data sends.Comprise the indication that immediate data is transmitted in the described message.The information element switching type is set to IntraeNBInterMME (switch between different MME eNB inside) in the message.When switching type is IntraeNBInterMME, do not comprise the container of source eNB in the described message to purpose eNB.Optionally, when this handoff procedure was used for the load rebalancing method, the cause value that comprises in the message was set to load balancing.

502 source MME wait-for-response message.

If 503 source MME receive next " forwarding relocation response " message from purpose MME, 504 source MME send " switching command " message and give source eNB.Switching type is set to IntraeNBInterMME.When switching type is IntraeNBInterMME, do not comprise the container of purpose eNB in the described message to source eNB.When switching type was IntraeNBInterMME, carrying tabulation that the information element in the described message is transmitted and the carrying tabulation that discharges did not exist.Source MME wait-for-response message (502 step).If 505 source MME receive next " transmitting reorientation finishes " message from purpose MME, 506 source MME send " transmit reorientation and finish affirmation " message and give purpose eNB.

To should embodiment, wherein the motion flow of purpose MME as shown in Figure 6.Be detailed description below, ignored the detailed technical descriptioon that has nothing to do with the present invention here this figure.

601 purpose MME receive message.

If 602 receive next " forwarding re-positioning request " message from source MME, 603 purpose MME verify whether source Serving GW can continue to serve this UE.If can not, 604 purpose MME select a new Serving GW.Here the detailed description of ignoring selection function.Purpose MME sends and " creates the carrying request information and give purpose Serving GW." comprise bearer context in the establishment carrying request information, as PDN GW address and TEIDs (this is for the S5 based on GTP, the situation of S8 interface).Purpose Serving GW distributes the address of S-GW and the transmission that TEIDs is used for S1 interface upstream data.If source Serving GW continues this UE of service, Serving GW in source is the same with purpose Serving GW so, and the message of this step does not need.

If 605 source Serving GW continue to serve this UE, source MME sends " handoff request " message and gives purpose eNB.The information element switching type is set to IntraeNBInterMME in the message.When switching type is IntraeNBInterMME, do not comprise the container of source eNB in the described message to purpose eNB.There is not (source Serving GW continues to serve this UE) in the carrying tabulation that information element in " handoff request " message need be set up.The carrying tabulation that information element need be set up is optional information element.Optionally, when this handoff procedure was used for the load rebalancing method, the cause value that comprises in the message was set to load balancing.

If 606 purpose MME receive next " creating the carrying response " message from purpose Serving GW, carry out 605.If selected new Serving GW, comprise the carrying tabulation that information element need be set up in 605 steps " handoff request " message, the carrying tabulation that needs to set up comprises bearing identification, the up TEID that transport layer address and new Serving GW distribute.

If 607 purpose MME receive next " Handover Request Acknowledge " message from purpose eNB, 608 purpose MME send " forwarding relocation response " message and give source MME.

If 609 purpose MME receive next " switching notice " message from purpose eNB, 610 purpose MME send " transmitting reorientation finishes " message and give source MME.

If 611 purpose MME receive next " transmit reorientation and finish affirmation " message from source MME, if purpose MME has selected new Serving GW, " more the new bearer request information is given purpose Serving GW in 612 purpose MME transmission.Purpose MME receives from the process of purpose Serving GW next " more new bearer response " same as the prior art, ignores detailed technical descriptioon here.

To should embodiment, wherein the motion flow of eNB as shown in Figure 7.Be detailed description below, ignored the detailed technical descriptioon that has nothing to do with the present invention here this figure.

701eNB receives message.

If 702 eNB receive next " handoff request " message from purpose MME, 703eNB sends " Handover Request Acknowledge " message and gives purpose MME.If the switching type in the message in " handoff request " message is set to IntraeNBInterMME.Then the switching type in " Handover Request Acknowledge " message is set to IntraeNBInterMME.When switching type is IntraeNBInterMME, do not comprise the container of purpose eNB in the described message to source eNB.If comprise the carrying tabulation that information element need be set up in " handoff request " message, comprise carrying in described " Handover Request Acknowledge " message and accept tabulation or carrying failure tabulation.Otherwise tabulation is accepted in the carrying in " Handover Request Acknowledge " message and carrying failure tabulation does not exist.

If 704 eNB receive next " switching command " message from source MME, 705eNB sends " switching command " message and gives UE.When if the switching type from " switching command " message that source MME comes is IntraeNBInterMME, optionally, described eNB sends to the configuration information that can not comprise the purpose sub-district in UE's " switching command " message, and for example the configuration information of difference (delta) information is empty.The wireless resource configuration that the source eNB of that is to say sends to Target cell in UE's " switching command " message is optional.This message can only be used to notify the change of UE MME, perhaps triggers the TAU process of UE.ENB sends " switching command " message to behind the UE, can continue to send descending data to UE.

Optionally, if 706 eNB receive next " switch and confirm " message from UE, 707eNB sends " switching notice " message and gives purpose MME.

Fig. 8 is the another kind of implementation of UE at the inner MME of switching of eNB repositioning process.Be detailed description below, ignored the detailed technical descriptioon that has nothing to do with the present invention here this scheme.In following figure and the description also all is the saying that has kept source eNB and purpose eNB.In fact be same entity for source eNB and purpose eNB in the inner switching of eNB MME repositioning process.This description does not influence the method for invention itself.In description, ignored detailed technical descriptioon same as the prior art to following embodiment.

801 source MME send " handover trigger " message and give source eNB." handover trigger " message comprises MME UE S1AP ID, the eNB UE S1AP ID of corresponding UE.Optionally, comprise the information element reason in the described message.If for the load rebalancing method, cause value is set to load balancing.

It is the process of switching the MME reorientation in the eNB that 802 source eNB decision S1 handoff procedure, the S1 here switch.803 source eNB send " switching demand " message and give source MME.Comprise the indication that source eNB whether can immediate data transmits to purpose eNB in the described message.Can be set to immediate data when switching in the eNB and transmit the indication existence.Handoff requirement message comprises following information element:

√ MME UE S1AP ID (MME UE S1 Application Part sign)

√ eNB UE S1AP ID (eNB UE S1 Application Part sign)

√ switching type＜comprising: IntraeNBInterMME (switching between MME in the eNB), IntraLTE (LTE inside), LTEtoUTRAN (LTE is to UTRAN), LTEtoGERAN (LTE is to GERAN) 〉

The √ reason

√ source sign

√ purpose sign

The availability that the √ immediate data is transmitted

Wherein switching type is set to IntraeNBInterMME.Cause value is set to load balancing.When switching type was set to IntraeNBInterMME, source eNB did not exist to the container of purpose eNB.

804 source MME send " forwarding re-positioning request " message and give purpose MME.Transmit in the RELOCATION REQUEST message and comprise MME UE context.MME UE context comprises and is used for PDN GW address that upstream data sends and TEIDs (this is for based on the S5 of GTP, the situation of S8 interface, for the situation based on the S5/S8 of PMIP, the present invention ignores detailed description) and address and the TEIDs of Serving GW.Comprise the indication that immediate data is transmitted in the described message.When switching type is IntraeNBInterMME, do not comprise the container of source eNB in the described message to purpose eNB.Optionally, when this handoff procedure was used for the load rebalancing method, the cause value that comprises in the message was set to load balancing.

805 purpose MME verify whether source Serving GW can continue to serve this UE.If can not, purpose MME selects a new Serving GW, and purpose MME sends and " creates the carrying request information and give purpose Serving GW.Here the detailed description of ignoring selection function.If source Serving GW continues this UE of service, Serving GW in source is the same with purpose Serving GW so, and the message of this step does not need." comprise bearer context in the establishment carrying request information, as PDN GW address and TEIDs (this is for the S5 based on GTP, the situation of S8 interface).Purpose Serving GW distributes S-GW address and TEIDs to be used for the transmission of S1 interface upstream data.805a, purpose Serving GW send " creating the carrying response " message and give purpose MME.Message comprises Serving GW address and up TEIDs " to create the carrying response ".

806 purpose MME send " handoff request " message and give purpose eNB.The information element switching type can be set to IntraeNBInterMME in the message.When switching type is IntraeNBInterMME, do not comprise the container of source eNB in the described message to purpose eNB.Optionally, when this handoff procedure was used for the load rebalancing method, the cause value that comprises in the message was set to load balancing.If selected new Serving GW, comprise the carrying tabulation that information element need be set up in " handoff request " message, the carrying tabulation that needs to set up comprises bearing identification, the up TEID that transport layer address and new Serving GW distribute.The carrying tabulation that information element need be set up is optional information element.

806a purpose eNB sends " Handover Request Acknowledge " message and gives purpose MME.The information element switching type is set to IntraeNBInterMME in the message.When switching type is IntraeNBInterMME, do not comprise the container of purpose eNB in the described message to source eNB.If comprise the carrying tabulation that information element need be set up in " handoff request " message, comprise carrying in described " Handover Request Acknowledge " message and accept tabulation or carrying failure tabulation.Otherwise tabulation is accepted in the carrying in " Handover Request Acknowledge " message and carrying failure tabulation does not exist.。

807 purpose MME send " forwarding relocation response " message and give source MME.

808 source MME send " switching command " message and give source eNB.Switching type is set to IntraeNBInterMME.When switching type is IntraeNBInterMME, do not comprise the container of purpose eNB in the described message to source eNB.When switching type was IntraeNBInterMME, carrying tabulation that the information element in the described message is transmitted and the carrying tabulation that discharges did not exist.

809 source eNB send " switching command " message and give UE.Optionally, can not comprise the configuration information of purpose sub-district in the described message, for example the configuration information of difference (delta) information is empty.The wireless resource configuration that the source eNB of that is to say sends to Target cell in UE's " switching command " message is optional.This message can only be used to notify the change of UE MME, perhaps triggers the TAU process of UE.ENB sends " switching command " message to behind the UE, can continue to send descending data to UE.

810UE sends " switch and confirm " message and gives purpose eNB.

811 purpose eNB send " switching notice " message and give purpose MME.

812 purpose MME send " transmitting reorientation finishes " message and give source MME.

813 source MME send " transmit reorientation and finish affirmation " and give purpose MME.

814 is optional, if Serving GW reorientation, " more the new bearer request information is given purpose Serving GW in purpose MME transmission.Purpose Serving GW divides address and the TEIDs that is used in the transmission of PDN GW downlink data." more the new bearer request information is given PDN GW in 815 purpose Serving GW transmission.Comprise Serving GW address and TEIDs in the described message.815a PDN GW upgrades contextual information, sends " more new bearer response " message and gives purpose Serving GW.PDN GW begins to send downlink data to purpose Serving GW.If Serving GW does not have reorientation, 814,815,815a, the message of 816 steps does not need.Serving GW directly sends data to purpose eNB.816 purpose Serving GW send " more new bearer response " message and give purpose MME.Comprise PDN GW address and TEIDs (this is for the S5 based on GTP, the situation of S8 interface) in the described message.

Optionally, UE initiates the TAU process.

UE at the inner another kind of implementation that switches the MME repositioning process of eNB as shown in Figure 9.Be detailed description below to this scheme.

901 source MME decision is reoriented to another one MME to UE.Here the detailed technical descriptioon of ignoring selection function.Source MME sends " MME re-positioning request " message and gives the purpose MME that selects." MME re-positioning request " message comprises information element: the MMEUE context, MME UE context comprises that PDN GW is used for the PDNGW address and the channel number of upstream data transmission and is used for Serving GW address and the channel number that upstream data sends, and is used for eNB address and channel number that downlink data sends.MME UE context comprises eNB UE S1AP ID.

Move into if 902 purpose MME can accept UE, purpose MME preserves the UE contextual information of receiving, MME sends " MME relocation response " message and gives source MME.Optionally, the MME relocation response message comprises the new MME UES1AP ID that purpose MME distributes.Move into if purpose MME can not accept UE, MME sends " MME reorientation failure " message and gives source MME.MME reorientation failed message comprises the reason of failure.

903 source MME receive the MME relocation response message of success.Source MME sends " handoff request " message and gives eNB.Handoff request comprises information element: type of message, MMEUE S1AP ID, eNB UE S1AP ID, reason, new MME sign (as new GUMMEI, perhaps MME address).Optionally, handoff request message contains the new MME UE S1AP ID that purpose MME distributes.

904eNB upgrades the UE context.ENB sends " handoff response " message and gives source MME." handoff response " message comprises type of message, MME UE S1AP ID, eNB UE S1APID.The MME UE S1AP ID that eNB source of release MME distributes.

905 is optional, and UE initiates the TAU renewal process.In the TAU renewal process, new S-TMSI is notified to UE.Upgrade the log-on message of UE simultaneously at HSS.

UE at the inner another kind of implementation that switches the MME repositioning process of eNB as shown in figure 10.Be detailed description below to this scheme.

1001 source MME send " switching notice " message and give eNB.Handoff notification message comprises information element: type of message, MME UE S1AP ID, eNB UE S1AP ID, reason.

1002eNB sends " handoff request " message and gives source MME.Handoff request message contains information element: type of message, MME UE S1AP ID, eNB UE S1AP ID, reason.Wherein purpose MME can be selected by eNB, and eNB selects purpose MME according to the load factor of each MME in the MME pond.Corresponding this method, handoff request message contains purpose MME information, and purpose MME information can be purpose MME sign GUMMEI.Purpose MME also can be selected after receiving the handoff request message of eNB by source MME.

1003 source MME send " MME re-positioning request " message and give the purpose MME that selects." MME re-positioning request " message comprises information element: MME UE context, MME UE context comprises that PDN GW is used for the PDN GW address and the channel number of upstream data transmission and is used for Serving GW address and the channel number that upstream data sends, and is used for eNB address and channel number that downlink data sends.MME UE context comprises eNB UE S1AP ID.

Move into if 1004 purpose MME can accept UE, purpose MME preserves the UE contextual information of receiving, MME sends " MME relocation response " message and gives source MME.Optionally, the MME relocation response message comprises the new MME UES1AP ID that purpose MME distributes.Move into if purpose MME can not accept UE, MME sends " MME reorientation failure " message and gives source MME.MME reorientation failed message comprises the reason of failure.

1005 source MME receive the MME relocation response message of success.Source MME sends " handoff response " message and gives eNB.Handoff response comprises information element: type of message, MMEUE S1AP ID, eNB UE S1AP ID, reason.Corresponding select the method for purpose MME, comprise new MME sign (as new GUMMEI, perhaps MME address) in the switching response message by source MME.Switching response message comprises the new MME UES1AP ID that purpose MME distributes.The MME UE S1AP ID that eNB source of release MME distributes.

1006 is optional, and UE initiates the TAU renewal process.In the TAU renewal process, new S-TMSI is notified to UE.Upgrade the log-on message of UE simultaneously at HSS.

UE at the inner another kind of implementation that switches the MME repositioning process of eNB as shown in figure 11.Be detailed description below to this scheme.In following figure and the description also all is the saying that has kept source eNB and purpose eNB.In fact be same entity for source eNB and purpose eNB in the inner switching of eNB MME repositioning process.This description does not influence the method for invention itself.In description, ignored detailed technical descriptioon same as the prior art to following embodiment.

1101 source MME send " handover trigger " message and give source eNB." handover trigger " message comprises MME UE S1AP ID, the eNB UE S1AP ID of corresponding UE.Optionally, comprise the information element reason in the described message.If for the load rebalancing method, cause value is set to load balancing.

It is the process of switching the MME reorientation in the eNB that 1102 source eNB decision S1 handoff procedure, the S1 here switch.1103 source eNB send " switching demand " message and give source MME.Comprise the indication that source eNB whether can immediate data transmits to purpose eNB in the described message.Can be set to immediate data when switching in the eNB and transmit the indication existence.Handoff requirement message comprises following information element:

√ MME UE S1AP ID (MME UE S1 Application Part sign)

√ eNB UE S1AP ID (eNB UE S1 Application Part sign)

The √ reason

√ source sign

√ purpose sign

The availability that the √ immediate data is transmitted

This method is to use existing " switching demand " to do some adaptations under the inner scene of switching of eNB when message is used for load balancing, as defines new switching type.Another method is to define new message as " switching beginning ", and new message comprises information element: MME UES1AP ID, eNB UE S1AP ID, reason, purpose sign (being used for recognition purpose MME).

1104 source MME send " forwarding re-positioning request " message and give purpose MME.Transmit in the RELOCATION REQUEST message and comprise MME UE context.MME UE context comprises and is used for PDN GW address that upstream data sends and TEIDs (this is for based on the S5 of GTP, the situation of S8 interface, for the situation based on the S5/S8 of PMIP, the present invention ignores detailed description) and address and the TEIDs of Serving GW.When switching type is IntraeNBInterMME, do not comprise the container of source eNB in the described message to purpose eNB.Optionally, when this handoff procedure was used for the load rebalancing method, the cause value that comprises in the message was set to load balancing.

1105 purpose MME verify whether source Serving GW can continue to serve this UE.If can not, purpose MME selects a new Serving GW, and purpose MME sends and " creates the carrying request information and give purpose Serving GW.Here the detailed description of ignoring selection function.If source Serving GW continues this UE of service, Serving GW in source is the same with purpose Serving GW so, and the message of this step does not need." comprise bearer context in the establishment carrying request information, as PDN GW address and TEIDs (this is for the S5 based on GTP, the situation of S8 interface).Purpose Serving GW distributes S-GW address and TEIDs to be used for the transmission of S1 interface upstream data.1105a, purpose Serving GW send " creating the carrying response " message and give purpose MME.Message comprises Serving GW address and up TEIDs " to create the carrying response ".

1106 purpose MME send " handoff request " message and give purpose eNB.Comprise information element MME UE S1AP ID in the handoff request message.The information element switching type can be set to IntraeNBInterMME in the message.When switching type is IntraeNBInterMME, do not comprise the container of source eNB in the described message to purpose eNB.Optionally, when this handoff procedure was used for the load rebalancing method, the cause value that comprises in the message was set to load balancing.If selected new Serving GW, comprise the carrying tabulation that information element need be set up in " handoff request " message, the carrying tabulation that needs to set up comprises bearing identification, the up TEID that transport layer address and new Serving GW distribute.The carrying tabulation that information element need be set up is optional information element.

1106a purpose eNB sends " Handover Request Acknowledge " message and gives purpose MME.Comprise information element MME UE S1AP ID in the switching request acknowledgement message, eNB UE S1AP ID.The information element switching type is set to IntraeNBInterMME in the message.When switching type is IntraeNBInterMME, do not comprise the container of purpose eNB in the described message to source eNB.If comprise the carrying tabulation that information element need be set up in " handoff request " message, comprise carrying in described " Handover Request Acknowledge " message and accept tabulation or carrying failure tabulation.Otherwise tabulation is accepted in the carrying in " Handover Request Acknowledge " message and carrying failure tabulation does not exist.。

1107 purpose MME send " forwarding relocation response " message and give source MME.

1108 source MME send " switching command " message and give source eNB.Switching type is set to IntraeNBInterMME.When switching type is IntraeNBInterMME, do not comprise the container of purpose eNB in the described message to source eNB.When switching type was IntraeNBInterMME, carrying tabulation that the information element in the described message is transmitted and the carrying tabulation that discharges did not exist.

1109 is optional, and UE initiates the TAU renewal process.In the TAU renewal process, new S-TMSI is notified to UE.Upgrade the log-on message of UE simultaneously at HSS.

All be to initiate the inner MME repositioning process that switches of eNB in the above-described embodiment by source MME.For the load balancing between MME, MME can or call relative capacity (relative capacity) separately load factor (weigh factor) and be notified to eNB.ENB knows the loading condition of each MME in the MME pond, so the inner MME repositioning process that switches of eNB also can be initiated according to the loading condition of MME by eNB.Be the description of the embodiment of the inner MME repositioning process that switches of eNB that eNB is initiated below.

UE is at the inner another kind of implementation that switches the MME repositioning process of eNB as shown in figure 12: the signaling process in this scheme is identical with Fig. 3, distinguishes to be the content of message and the action behavior of equipment.Here ignored the explanation of record at length same as the prior art.

The S1 handoff procedure is initiated in 1201 source eNB decision, and it is the process of switching the MME reorientation in the eNB that the S1 here switches.1202 source eNB send " switching demand " message and give source MME.Comprise the indication that source eNB whether can immediate data transmits to purpose eNB in the described message.Can be set to immediate data when switching in the eNB and transmit the indication existence.Handoff requirement message comprises following information element:

√ MME UE S1AP ID (MME UE S1 Application Part sign)

√ eNB UE S1AP ID (eNB UE S1 Application Part sign)

The √ reason

√ source sign

√ purpose sign

The availability that the √ immediate data is transmitted

Wherein purpose MME can be selected by eNB, and corresponding this method, handoff request message contain purpose MME information, and purpose MME information can be purpose MME sign GUMMEI, as comprise the sign of the purpose MME of source eNB selection in the purpose sign.Purpose MME also can be carried out after receiving the handoff requirement message of eNB by source MME.

1203 source MME send " forwarding re-positioning request " message and give purpose MME.Transmit in the RELOCATION REQUEST message and comprise MME UE context.MME UE context comprises and is used for PDN GW address that upstream data sends and TEIDs (this is for based on the S5 of GTP, the situation of S8 interface, for the situation based on the S5/S8 of PMIP, the present invention ignores detailed description) and address and the TEIDs of Serving GW.Comprise the indication that immediate data is transmitted in the described message.When switching type is IntraeNBInterMME, do not comprise the container of source eNB in the described message to purpose eNB.Optionally, when this handoff procedure was used for the load rebalancing method, the cause value that comprises in the message was set to load balancing.

1204 purpose MME verify whether source Serving GW can continue to serve this UE.If can not, purpose MME selects a new Serving GW, and purpose MME sends and " creates the carrying request information and give purpose Serving GW.Here the detailed description of ignoring selection function.If source Serving GW continues this UE of service, Serving GW in source is the same with purpose Serving GW so, and the message of this step does not need." comprise bearer context in the establishment carrying request information, as PDN GW address and TEIDs (this is for the S5 based on GTP, the situation of S8 interface).Purpose Serving GW distributes S-GW address and TEIDs to be used for the transmission of S1 interface upstream data.1204a, purpose Serving GW send " creating the carrying response " message and give purpose MME.Message comprises Serving GW address and up TEIDs " to create the carrying response ".

1205 purpose MME send " handoff request " message and give purpose eNB.Comprise MME UE S1AP ID in " handoff request " message.The information element switching type can be set to IntraeNBInterMME in the message.When switching type is IntraeNBInterMME, do not comprise the container of source eNB in the described message to purpose eNB.Optionally, when this handoff procedure was used for the load rebalancing method, the cause value that comprises in the message was set to load balancing.If selected new Serving GW, comprise the carrying tabulation that information element need be set up in " handoff request " message, the carrying tabulation that needs to set up comprises bearing identification, the up TEID that transport layer address and new Serving GW distribute.The carrying tabulation that information element need be set up is optional information element.

1205a purpose eNB sends " Handover Request Acknowledge " message and gives purpose MME.Comprise MME UE S1AP ID in the switching request acknowledgement message, eNB UE S1AP ID.The information element switching type is set to IntraeNBInterMME in the message.When switching type is IntraeNBInterMME, do not comprise the container of purpose eNB in the described message to source eNB.If comprise the carrying tabulation that information element need be set up in " handoff request " message, comprise carrying in described " Handover Request Acknowledge " message and accept tabulation or carrying failure tabulation.Otherwise tabulation is accepted in the carrying in " Handover Request Acknowledge " message and carrying failure tabulation does not exist.

1206 purpose MME send " forwarding relocation response " message and give source MME.

1207 source MME send " switching command " message and give source eNB.Switching type is set to IntraeNBInterMME.When switching type is IntraeNBInterMME, do not comprise the container of purpose eNB in the described message to source eNB.When switching type was IntraeNBInterMME, carrying tabulation that the information element in the described message is transmitted and the carrying tabulation that discharges did not exist.

1208 source eNB send " switching command " message and give UE.Optionally, can not comprise the configuration information of purpose sub-district in the described message, for example the configuration information of difference (delta) information is empty.The wireless resource configuration that the source eNB of that is to say sends to Target cell in UE's " switching command " message is optional.This message can only be used to notify the change of UE MME, perhaps triggers the TAU process of UE.ENB sends " switching command " message to behind the UE, can continue to send descending data to UE.

1209UE sends " switch and confirm " message and gives purpose eNB.

1210 purpose eNB send " switching notice " message and give purpose MME.

1211 purpose MME send " transmitting reorientation finishes " message and give source MME.

1212 source MME send " transmit reorientation and finish affirmation " and give purpose MME.

1213 is optional, if Serving GW reorientation, " more the new bearer request information is given purpose Serving GW in purpose MME transmission.Purpose Serving GW divides address and the TEIDs that is used in the transmission of PDN GW downlink data." more the new bearer request information is given PDN GW in 1214 purpose Serving GW transmission.Comprise Serving GW address and TEIDs in the described message.815a PDN GW upgrades contextual information, sends " more new bearer response " message and gives purpose Serving GW.PDN GW begins to send downlink data to purpose Serving GW.If Serving GW does not have reorientation, 1213,1214,1214a, the message of 1215 steps does not need.Serving GW directly sends data to purpose eNB.1215 purpose Serving GW send " more new bearer response " message and give purpose MME.Comprise PDN GW address and TEIDs (this is for the S5 based on GTP, the situation of S8 interface) in the described message.

1216 is optional, and UE initiates the TAU process.

UE at the inner another kind of implementation that switches the MME repositioning process of eNB as shown in figure 13.Be detailed description below to this scheme.

The S1 handoff procedure is initiated in 1301 source eNB decision, and it is the process of switching the MME reorientation in the eNB that the S1 here switches.1302 source eNB send " switching demand " message and give source MME.Comprise the indication that source eNB whether can immediate data transmits to purpose eNB in the described message.Can be set to immediate data when switching in the eNB and transmit the indication existence.Handoff requirement message comprises following information element:

√ MME UE S1AP ID (MME UE S1 Application Part sign)

√ eNB UE S1AP ID (eNB UE S1 Application Part sign)

The √ reason

√ source sign

√ purpose sign

The availability that the √ immediate data is transmitted

This method is to use existing " switching demand " to do some adaptations under the inner scene of switching of eNB when message is used for load balancing, as defines new switching type.Another method is to define new message as " switching beginning ", and new message comprises information element: MME UES1AP ID, eNB UE S1AP ID, reason.If select purpose MME, also comprise purpose sign (being used for recognition purpose MME) in the described message by eNB.

1303 source MME send " forwarding re-positioning request " message and give purpose MME.Transmit in the RELOCATION REQUEST message and comprise MME UE context.MME UE context comprises and is used for PDN GW address that upstream data sends and TEIDs (this is for based on the S5 of GTP, the situation of S8 interface, for the situation based on the S5/S8 of PMIP, the present invention ignores detailed description) and address and the TEIDs of Serving GW.Comprise the indication that immediate data is transmitted in the described message.When switching type is IntraeNBInterMME, do not comprise the container of source eNB in the described message to purpose eNB.Optionally, when this handoff procedure was used for the load rebalancing method, the cause value that comprises in the message was set to load balancing.

1304 purpose MME verify whether source Serving GW can continue to serve this UE.If can not, purpose MME selects a new Serving GW, and purpose MME sends and " creates the carrying request information and give purpose Serving GW.Here the detailed description of ignoring selection function.If source Serving GW continues this UE of service, Serving GW in source is the same with purpose Serving GW so, and the message of this step does not need." comprise bearer context in the establishment carrying request information, as PDN GW address and TEIDs (this is for the S5 based on GTP, the situation of S8 interface).Purpose Serving GW distributes S-GW address and TEIDs to be used for the transmission of S1 interface upstream data.1304a, purpose Serving GW send " creating the carrying response " message and give purpose MME.Message comprises Serving GW address and up TEIDs " to create the carrying response ".

1305 purpose MME send " handoff request " message and give purpose eNB.Comprise MME UE S1AP ID in " handoff request " message.The information element switching type can be set to IntraeNBInterMME in the message.When switching type is IntraeNBInterMME, do not comprise the container of source eNB in the described message to purpose eNB.Optionally, when this handoff procedure was used for the load rebalancing method, the cause value that comprises in the message was set to load balancing.If selected new Serving GW, comprise the carrying tabulation that information element need be set up in " handoff request " message, the carrying tabulation that needs to set up comprises bearing identification, the up TEID that transport layer address and new Serving GW distribute.The carrying tabulation that information element need be set up is optional information element.

1305a purpose eNB sends " Handover Request Acknowledge " message and gives purpose MME.Comprise MME UE S1AP ID in the switching request acknowledgement message, eNB UE S1AP ID.The information element switching type is set to IntraeNBInterMME in the message.When switching type is IntraeNBInterMME, do not comprise the container of purpose eNB in the described message to source eNB.If comprise the carrying tabulation that information element need be set up in " handoff request " message, comprise carrying in described " Handover Request Acknowledge " message and accept tabulation or carrying failure tabulation.Otherwise tabulation is accepted in the carrying in " Handover Request Acknowledge " message and carrying failure tabulation does not exist.

1306 purpose MME send " forwarding relocation response " message and give source MME.

1307 source MME send " switching command " message and give source eNB.Switching type is set to IntraeNBInterMME.When switching type is IntraeNBInterMME, do not comprise the container of purpose eNB in the described message to source eNB.When switching type was IntraeNBInterMME, carrying tabulation that the information element in the described message is transmitted and the carrying tabulation that discharges did not exist.

1308 is optional, and UE initiates the TAU renewal process.In the TAU renewal process, new S-TMSI is notified to UE.Upgrade the log-on message of UE simultaneously at HSS.

UE at the inner another kind of implementation that switches the MME repositioning process of eNB as shown in figure 14.Be detailed description below to this scheme.

1401eNB initiates the handoff procedure between the inner different MME of eNB.ENB sends " handoff request " message and gives source MME." handoff request " message message comprises information element: MMEUE S1AP ID, eNB UE S1AP ID, reason.Wherein purpose MME can be selected by eNB, and corresponding this method, handoff request message contain purpose MME information, and purpose MME information can be purpose MME sign GUMMEI.The selection of purpose MME also can be carried out after receiving the handoff request message of eNB by source MME.

1402 source MME send " MME re-positioning request " message and give the purpose MME that selects." MME re-positioning request " message comprises information element: MME UE context, MME UE context comprises that PDN GW is used for the PDN GW address and the channel number of upstream data transmission and is used for Serving GW address and the channel number that upstream data sends, and is used for eNB address and channel number that downlink data sends.MME UE context comprises eNB UE S1AP ID.

Move into if 1403 purpose MME can accept UE, purpose MME preserves the UE contextual information of receiving, MME sends " MME relocation response " message and gives source MME.The MME relocation response message comprises the new MME UE S1APID that purpose MME distributes.Move into if purpose MME can not accept UE, MME sends " MME reorientation failure " message and gives source MME.MME reorientation failed message comprises the reason of failure.

1404 source MME receive the MME relocation response message of success.Source MME sends " handoff response " message and gives eNB.Handoff response comprises information element: type of message, MMEUE S1AP ID, eNB UE S1AP ID, reason.Corresponding source MME selects the method for purpose MME after receiving handoff request message, switching response message comprises new MME and identifies (as new GUMMEI, perhaps MME address).Switching response message comprises the new MME UE S1AP ID that purpose MME distributes.ENB upgrades the UE context after receiving switching response message.The MME UE S1AP ID that eNB source of release MME distributes.

1405 is optional, and UE initiates the TAU renewal process.In the TAU renewal process, new S-TMSI is notified to UE.Upgrade the log-on message of UE simultaneously at HSS.

UE at the inner another kind of implementation that switches the MME repositioning process of eNB as shown in figure 15.Be detailed description below to this scheme.

1501eNB initiates the handoff procedure between the inner different MME of eNB.ENB sends " handoff request " message and gives purpose MME." handoff request " message message comprises information element: type of message, eNB UE S1AP ID, reason.Also comprise source MME sign and UE in the message at the MME of source MME UE S1AP ID.

After 1502 purpose MME receive handoff request message, send " MME UE context request " message and give source MME.Comprise source MME UE S1AP ID in the described message.Optionally, also comprise eNB UE S1AP ID in the message.

1503 source MME send " MME UE context response " message and give purpose MME.MME UE context response information comprises MME UE context.MME UE context comprises that PDN GW is used for the PDN GW address and the channel number of upstream data transmission and is used for Serving GW address and the channel number that upstream data sends, and is used for eNB address and channel number that downlink data sends.

1504 purpose MME send " handoff response " message and give eNB.Switching response message comprises information element: type of message, eNB UE S1AP ID, the MMEUE S1AP ID that purpose MME distributes.

1505 is optional, and UE initiates the TAU renewal process.In the TAU renewal process, new S-TMSI is notified to UE.Upgrade the log-on message of UE simultaneously at HSS.

The method of the support MME reorientation that provides by the present invention makes the MME load balancing implement more and optimizes, and reduces prior signaling process, raise the efficiency, save the consumption of UE, reduce the potential fault processing of UE end, and the problem and the harmful effect that do not bring any compatibility.

Although the present invention is described according to described embodiment, it is pointed out that these embodiment are used for explaining, rather than be used for the present invention is limited.Those of ordinary skill in the art can be easy to these embodiment are changed, increase, delete any step and do not break away from the spirit and scope of the present invention.

Claims

1. method of supporting the mobile management entity reorientation comprises step:

2. method according to claim 1 is characterized in that, comprises information element in described RELOCATION REQUEST message and the described handoff request message, and indicating this is switching type between the inner different MME of network control node.

3. method according to claim 2 is characterized in that, comprises information element in the described switching request acknowledgement message, and indicating this is switching type between the inner different mobile management entities of network control node.

4. method according to claim 3 is characterized in that, comprises information element in the described switching command message, and indicating this is switching type between the inner different mobile management entities of network control node.

5. according to the described method of one of claim 2-4, it is characterized in that comprising information element in described RELOCATION REQUEST message, described handoff request message or the described switching command message, the reason that indication is switched is the mobile management entity load balancing.

6. method according to claim 1 is characterized in that, described first mobile management entity is the source mobile management entity MME among the LTE, and second mobile management entity is the purpose mobile management entity MME.

7. method according to claim 1 is characterized in that described network control node is source eNB and the purpose eNB among the LTE.

8. method of supporting the mobile management entity reorientation comprises step:

Described first mobile management entity sends RELOCATION REQUEST message to second mobile management entity, comprises the routing iinformation of the described wireless network control node at user place in the described message;

9. method according to claim 8, it is characterized in that comprising information element in described switching demand, described RELOCATION REQUEST message and the described handoff request message, indicating this is switching type between the inner different mobile management entities of described network control node.

10. method according to claim 8 is characterized in that, comprises information element in the described switching request acknowledgement message, and indicating this is switching type between the inner different mobile management entities of network control node.

11. method according to claim 8 is characterized in that, comprises information element in the described switching command message, indicating this is switching type between the inner different mobile management entities of network control node.

12., it is characterized in that it is the mobile management entity load balancing that the information element that comprises in described switching demand, RELOCATION REQUEST message or the described handoff request message has been indicated the reason of switching according to the described method of one of claim 9-11.

13. method according to claim 8 is characterized in that, described first mobile management entity is the source mobile management entity MME among the LTE, and second mobile management entity is the purpose mobile management entity MME.

14. method according to claim 8 is characterized in that described network control node is source eNB and the purpose eNB among the LTE.

15. a method of supporting the mobile management entity reorientation comprises step:

16. method according to claim 15 is characterized in that described switching notice, handoff request, relocation request message contain information element, indicating this is switching type between the different mobile management entities of wireless network control intra-node.

17. method according to claim 15 is characterized in that described wireless network control node selects one second mobile management entity from a plurality of mobile management entities.

18. according to the described method of one of claim 15-17, it is characterized in that described first mobile management entity is the source mobile management entity among the LTE, second mobile management entity is the purpose mobile management entity.