CN101400084A - Method for changing service core network node of UE - Google Patents

Abstract

A method for changing the UE's serving core network node MME, comprising steps: when the UE moves to the MME pool, the eNB selects an MME from the MME pool for the UE; when the MME finds that it is not the target MME, the MME tells The routing information of the target MME of the UE; when the UE communicates with the network, the information is notified to the eNB; the eNB selects a new MME as the target MME of the UE according to the routing information provided by the UE. Through the present invention, it is possible to simplify the process complexity when UE switches between eNB and HNB, making the switching process simpler and more practical.

Description

Change the method for the service core network node of UE

Technical field

The present invention relates on the basis of universal mobile telecommunications system (hereinafter to be referred as UMTS), carry out the mobile communication system (hereinafter to be referred as E-UMTS) of evolution, particularly a kind of method that the network service node of subscriber equipment is changed.

Background technology

The research of the long evolving system of UMTS system (LTE) is a standardization effort that is undertaken by third generation partner program 3GPP leader.LTE is intended to set up a high data access rate, inserts and the mobile communication system of high-throughput fast.

Fig. 1 describes is system construction drawing in the present stage LTE standardisation process.Subscriber equipment (hereinafter to be referred as UE) carries out radio communication by the air interface of LTE and the Access Network of enhancing (EUTRAN).Pass through the transfer of data that S1-U interface carries out user plane between the Access Network EUTRAN that strengthens and the SAE gateway of service.Carry out the Signalling exchange of control plane between EUTRAN and the mobile management entity (hereinafter to be referred as MME) by S1-MME interface.When UE is belonging to EUTRAN node motion under the different MME control, carry out the relevant contextual transmission of UE by the S10 interface between the MME, concrete process can be with reference to the existing flow process between the existing SGSN, as shown in Figure 2.Carry out the foundation of SAE carrying between the SAE gateway of MME and service by the S11 interface, UE such as adheres at function.Between the SAE gateway of service and the foundation of carrying between the PDN SAE gateway, and the transmission of data.

As shown in Figure 2, the capital equipment among EUTAN is exactly eNB (enhanced base station), is the S1 interface between eNB and the MME, and eNB is connected with a plurality of MME, and these a plurality of MME are in the same MME pond.

In Fig. 2, eNB can and a plurality of MME between set up the S1 interface.When the sub-district below a UE moves to this eNB, it is the contextual MME of that in store UE that eNB will find the serving network node of this UE so.UE offers for example network resource identifier (NRI) of eNB routing iinformation, which node eNB decides according to the NRI of its preservation and the corresponding relation between the MME is the serving network node of UE, and the non-access layer information that then UE will be sent to core network node MME is transmitted to MME.If the routing iinformation that eNB provides according to UE can not find corresponding core network node, mean that so UE moves to this MME pond for the first time, eNB distributes a MME according to the load balancing scheduling algorithm randomly to UE from the MME pond so.

HNB is used in family, university, the base station in places such as company.HNB is a plug and play.Be with the difference of common macro base station: common not every subscriber equipment can insert HNB.Can insert the HNB of family such as the subscriber equipment that has only subscriber household, perhaps this household agrees the subscriber equipment that other can insert.Have only the employee of company and the affiliate of its company permission to insert in a company.There is the one group of HNB HNB of same company (as be used in) of identical access customer group to be called closed user group (hereinafter to be referred as CSG, Closed Subscriber Group).The coupled core network node of HNB is set up S1 and is connected.But different with ENB is that a HNB only sets up S1 with a MME and is connected.For example shown in Figure 3, HNB1, the overlay area of HNB2 and HNB3 is in the overlay area of eNB.(MM1, MME2 MME3) set up the S1 interface, and HNB only sets up the S1 interface with MME3, and HNB2 only sets up the S1 interface with MME2, and HNB3 only sets up the S1 interface with MME2 for eNB and all MME.The MME that HNB connected is selected by network node, for example operation and management center (OMC).Whether this selection course has the UE existence with HNB, and it doesn't matter, and the general and residing position of HNB etc. has relation.

From top analysis we as can be seen, the serving MME of a subscriber equipment may not be same with the MME that HNB was connected under the UE.So this just mean when UE move to contiguous HNB local time, if switch, the serving MME of UE will change, simultaneously the UE S-GW that receives data also will change.If what UE carried out is again data service, do not allow obliterated data, forwarding of data is undertaken by two S-GW in addition so, and this is irrational for handoff procedure, the waste Internet resources.

Summary of the invention

The method that the purpose of this invention is to provide the service core network node of a kind of UE of change.

For achieving the above object, a kind of method that changes the service core network node MME of UE comprises step:

When a) UE moved to the MME pond, eNB selected a MME to UE from the MME pond;

B) when described MME found oneself not to be target MME, described MME told UE target MME's

Routing iinformation;

C) when UE and network communicate, tell eNB with this information;

D) routing iinformation that provides according to UE of eNB is selected the target MME of new MME as UE.

By the present invention, the flow process complexity in the time of can simplifying UE and switch between eNB and HNB makes handoff procedure more simple and practical.

Description of drawings

Fig. 1 is the system construction drawing of present LTE;

Fig. 2 is the annexation between eNB and the MME;

Fig. 3 is HNB and MME connection layout;

Fig. 4 is the invention flow chart;

Fig. 5 is the method that MME knows the MME that HNB connects;

Fig. 6 is the mode that another MME knows the MME that HNB connects of UE;

Fig. 7 is the action behavior figure of MME;

Fig. 8 is the action behavior figure of eNB;

Fig. 9 is the action behavior figure of UE.

Embodiment

What Fig. 4 described is flow chart of the present invention.

We call old MME432 to eNB to the MME that UE selects, and the MME that is connected with HNB is called target MME433.When UE moved to the MME pond at the beginning, eNB selected a MME according to the load balancing scheduling algorithm to UE from the MME pond, and promptly 432.We suppose the information of preserving the target MME that HNB connected of this UE among the old MME, and we describe concrete mode in Fig. 5 and Fig. 6.402 old MME find it oneself is not target MME, just accept to comprise in the message routing iinformation of target MME at its 403 routing region updatings that send to UE, the temporary mark S-TMSI that old MME distributes to UE.Network resource identifier field among the S-TMSI is used for identifying old MME.Also comprise the timer length of periodically carrying out routing region updating in this message.Present position is very near from HNB if old MME finds UE, just can be provided with timer time shortlyer, otherwise just can be provided with longly.After timer expiry, UE initiates routing area update procedures 404 again.UE sends Radio Resource connection protocol RRC405 to eNB, comprises the routing region updating request message that UE will send to core network node MME in this message, also comprises the routing iinformation of core network node MME.If general routing area update procedures, this routing iinformation is the network resource identifier NRI among the S-TMSI of UE so.And routing area update procedures hereto, this routing iinformation is the routing iinformation of the target MME that receives in 403.When eNB receives after 405, search the routing iinformation preserved in its configuration information and the mapping relations of MME address, find target MME, the routing region updating request message is transmitted to target MME.407 target MME find old MME by S-TMSI, carry out context swap 408 with it, then routing region updating are accepted message and send to UE, accept the update request of UE.Wherein 408 is prior aries, does not give unnecessary details at this.

What Fig. 5 described is the method that MME knows the MME that HNB connects.

Step 501, HNB sends and " adheres to request information and give OMC.The positional information that comprises HNB in the message.

Step 502, OMC HNB for this reason selects MME.OMC sends " adhering to response " message and gives HNB.Comprise above-mentioned the OMC MME and the S-GW address of HNB selection for this reason in described " adhering to response " message.Optionally, comprise the frequency that this HNB uses in the described message.The information that comprises adjacent cells in described " adhering to response " message.Optionally, the tracing area sign (hereinafter to be referred as TAI) that comprises this HNB in described " adhering to response " message.

Step 503, the process that the MME in HNB initiation and the above-mentioned message connects.HNB sends " connection request " message and gives MME.Optionally, comprise information ' there is the cell information of overlapping or adjacent covering HNB or CSG sub-district therewith ' in the described message.MME preserves the relevant information of HNB in the described message.MME sends " connection response " message and gives HNB.

Step 504, the connection request that MME response HNB initiates, set up with HNB between S1 be connected.Step 505 and 506, OMC sends " MME configuration notification " message to being the MMEs among same Pool of the selected MME of HNB and the adjacent Pool.The information that wherein comprises HNB.Optionally, the information of described HNB comprises the TAI at HNB place; Optionally, the information of described HNB comprises the cell information that there are overlapping or adjacent covering in HNB therewith or CSG sub-district; Optionally, the information of described HNB comprises the S-GW that HNB connects; Optionally, the information of described HNB comprises the position of HNB; Optionally, the information of described HNB comprises the HNB sign.

What Fig. 6 described is the mode that another MME knows the MME that HNB connects of UE.

HNB sends and " adheres to request information 601 and give OMC.The positional information that comprises HNB in the message.

Step 602, OMC HNB for this reason selects MME.OMC sends " adhering to response " message and gives HNB603.Comprise above-mentioned the OMC MME and the S-GW address of HNB selection for this reason in described " adhering to response " message.Optionally, comprise the frequency that this HNB uses in the described message.The information that comprises adjacent cells in described " adhering to response " message.Optionally, the tracing area sign (hereinafter to be referred as TAI) that comprises this HNB in described " adhering to response " message.

We suppose that OMC is 633 to the MME that HNB selects in the figure.

Step 604, the process that the MME in HNB initiation and the above-mentioned message connects.HNB sends " connection request " message and gives MME.Optionally, comprise information ' there is the cell information of overlapping or adjacent covering HNB or CSG sub-district therewith ' in the described message.MME preserves the relevant information of HNB in the described message.MME sends " connection response " message and gives HNB.

Step 605, the connection request that MME response HNB initiates, set up with HNB between S1 be connected.Afterwards, MME is registered to the information of this HNB among the HSS and goes.MME sends 606 location registration request message, comprises the sign of HNB in this message, the sign of the MME that it connected, the sign of CSG under the HNB, information such as UE sign.After HSS preserves these information, just return 607HNB location registration request acknowledge message.

After the UE start of this HNB, send 608 and adhere to request to core network node MME632, this MME will obtain the contextual information of UE from HSS there.MME sends 609 location update request message to HSS, comprises the sign of UE in this message, the sign of MME, information such as the residing tracing area sign of UE.HSS returns the relevant context of UE and gives MME, and these information can be upgraded in the response in 610 positions and comprise, also can after insertion UE subscription data in comprise.The information that comprises is exactly the MME sign that the HNB under this UE connects.Along with the moving of UE, can be sent to the new MME from old MME and go after these information.This finishes by 408 context swap.

That Fig. 7 describes is the action behavior figure of MME.

701MME judges whether the message of receiving is the routing region updating request message, if turn to 702.702MME judges whether it has preserved the HNB information of UE, then turns to 703 if having, otherwise turns to 705.703MME may judge the information such as distance of UE current location from HNB, if decision allows UE reselect MME, then turns to 704, otherwise turns to 705.704MME accepts to comprise in the message routing iinformation of target MME at the routing region updating that sends to UE.705MME handles the routing region updating request message, sends routing region updating to UE and accepts message.

Fig. 8 is the action behavior figure of eNB.

Whether what the 801eNB judgement was received is initial directly message transfer, if then turn to 802.802eNB seeks MME according to the routing iinformation that comprises in this message, turns to 803.803eNB judges whether can find corresponding M ME according to routing iinformation, if can, turn to 805, otherwise turn to 804.804eNB selects a MME according to the load balancing scheduling algorithm, turns to 805.The non-access layer information that 805eNB will comprise in will initially directly transmitting is transmitted to MME.

Fig. 9 is the action behavior figure of UE.

901UE judges whether the message of receiving is that routing region updating is accepted message, if turn to 903, otherwise turns to 902.903, UE judges whether comprise routing iinformation in this message, if then turn to 904, otherwise this message of normal process.904UE preserves this routing iinformation.

902UE judges whether it is periodicity routing area update procedures timer expiry, if then turn to 905.905UE judges whether it has preserved routing iinformation, if then turn to 906, otherwise turns to 907.The routing iinformation that 906UE comprises in the initial directly transmission that sends to eNB be exactly it at 904 routing iinformations of being preserved, turn to 908.907, the routing iinformation that UE comprises in the initial directly transmission that sends to eNB is exactly the routing iinformation that the temporary mark S-TMSI from UE extracts, and for example network resource identifier etc. turns to 908.908UE sends and initially directly is transferred to eNB.

Claims (5)

1. method that changes the service core network node of UE comprises step:

When a) UE moved to the MME pond, eNB selected a MME to UE from the MME pond;

B) when described MME found oneself not to be target MME, described MME told the routing iinformation of UE target MME;

C) when UE and network communicate, tell eNB with this information;

D) routing iinformation that provides according to UE of eNB is selected the target MME of new MME as UE.

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

Target MME finds old MME by S-TMSI, carries out context swap with it, then routing region updating is accepted message and sends to UE.

3. method according to claim 2 is characterized in that routing iinformation is a network resource identifier.

4. method according to claim 1 is characterized in that described eNB selects a MME according to load-balancing algorithm to UE from the MME pond.

5. method according to claim 2 is characterized in that present position is very near from HNB if old MME finds UE, then timer time be provided with shorter, otherwise can be provided with longer.

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