CN103906152A

CN103906152A - Method for supporting quick UE restoration

Info

Publication number: CN103906152A
Application number: CN201310552962.3A
Authority: CN
Inventors: 许丽香; 王弘; 梁华瑞
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecom R&D Center; Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2012-12-24
Filing date: 2013-11-08
Publication date: 2014-07-02
Anticipated expiration: 2033-11-08
Also published as: CN103906152B

Abstract

The invention discloses a method for supporting quick UE restoration. The method comprises the steps that when UE is connected into a service base station, the service base station conducts UE context synchronism on other base stations of relevant cell groups; when the UE fails, a base station used for conducting radio resource control (RRC) reconnection on the UE conducts RRC reconnection on the UE according to UE context stored in the synchronism process. The invention further discloses another method for supporting quick UE restoration. According to the technical scheme of the method, when the UE moves in a community scene and fails, the UE can be made to restore quickly, so that the UE is prevented from returning to a leisure mode, data are prevented from being lost, service consecutiveness is ensured, and user experience is improved.

Description

Support the method for the fast quick-recovery of UE

Technical field

The application relates to wireless communication technology, particularly supports the method for the fast quick-recovery of UE.

Background technology

Present mobile communication more and more trends towards providing for user the multimedia service of high rate data transmission, as shown in Figure 1, is the system architecture diagram of System Architecture Evolution (SAE).Wherein:

Subscriber equipment (UE) the 101st, is used for receiving the terminal equipment of data.Evolved universal terrestrial radio access network (E-UTRAN) the 102nd, Radio Access Network, comprising the macro base station (eNodeB/NodeB) that access of radio network interface is provided for UE.Mobile management entity (MME) 103 is in charge of mobile context, session context and the security information of UE.Gateway (SGW) 104 mainly provides the function of user plane, and MME103 and SGW104 may be in Same Physical entities.Grouped data network gateway (PGW) 105 is responsible for the functions such as charging, Lawful Interception, also can be with SGW104 in Same Physical entity."Policy and Charging Rules Function entity (PCRF) 106 provides service quality (QoS) strategy and charging criterion.Universal grouping wireless business supporting node (SGSN) the 108th, provides the apparatus for network node of route for the transmission of data in universal mobile telecommunications system (UMTS).Home subscriber server (HSS) the 109th, the local ownership subsystem of UE, responsible protection comprises the user profile such as address, user security information, the packet data content of subscriber equipment of current location, the service node of subscriber equipment.

3GPP is at version 12(Rel-12) demand that small-cell strengthens proposed, the target scene that small-cell strengthens includes the scene that macrocell covers and there is no the scene that macrocell covers, indoor scene and the enhancing of outdoor scene, ideal and imperfect backhaul, as shown in Figure 2.

In the situation that having macrocell to cover, propose to apply the technology of carrier aggregation between different base station.Macrocell and small-cell can be operated in different frequency ranges.In the situation that not having macrocell to cover, the performance that how to strengthen small-cell does not also have concrete scheme.

Summary of the invention

The application provides the method for supporting the fast quick-recovery of UE, in the time that UE moves under the scene of small-cell, makes UE quick-recovery soon failed in the situation that, thereby avoid UE to get back to idle pulley, avoid loss of data, guarantee business continuance, and improve user's impression.

The method of the fast quick-recovery of a kind of UE of support that the application provides, comprising:

When A, UE access service base station, it is synchronous that described serving BS carries out UE context to other base stations of relevant small-cell group;

B, in the time that UE occurs unsuccessfully, UE carries out the base station of Radio Resource control (RRC) connection re-establishment according to the UE context of preserving in synchronizing process, and described UE is carried out to RRC connection re-establishment.

Preferably, described UE access service base station is: UE is converted to enable mode from idle pulley in the community of described serving BS;

Described serving BS carries out UE context to other base stations of relevant small-cell group: described serving BS sends to the UE context of this UE other base stations of this small-cell, serving BS place group, and described UE context is preserved in described other base stations.

Preferably, the method further comprises:

In the time that needs upgrade UE context, serving BS sends to the UE context of renewal other base stations of this small-cell, serving BS place group, and the UE context of described renewal is preserved in described other base stations;

In the time getting back to idle pulley from enable mode in the community of UE at serving BS, or when UE moves away from the community of serving BS, or when UE moves away and object community not in the group of the small-cell at serving BS place time from the community of serving BS, serving BS sends and discharges the contextual message of UE to the corresponding base station in its small-cell, place group, and described corresponding base station discharges corresponding UE context.

Preferably, described UE access service base station is: UE accesses described serving BS Zhong community by switching;

Described serving BS carries out UE context to other base stations of relevant small-cell group: UE context is synchronized on Zu Zhong base station, object small-cell, and UE context on Zu Zhong base station, source of release small-cell;

Wherein, small-cell, source group refers to: the small-cell group at the source base station place of switching; Object small-cell group refers to: the small-cell group at the place, object base station of switching.

Preferably, before described A, further comprise:

The first base station and the second base station exchange small-cell group information in X2 process of establishing;

Or the first base station and the second base station exchange small-cell group information via core net by S1 interface;

Or, its small-cell group information of the first base station broadcast, UE obtains the small-cell group information of the first base station from the broadcast message of the first base station, and the small-cell group information of the first base station is sent to the second base station;

Or the first base station and the second base station exchange small-cell group information in X2 handoff procedure;

Or the first base station and the second base station exchange small-cell group information in S1 handoff procedure;

Described small-cell group information is: the station list in the mark of small-cell, place, base station group or small-cell, place, base station group; Described station list is the list that Base Station Identification list or base station IP address list or other can identify the information of base station.

Preferably, described UE context is synchronized on Zu Zhong base station, object small-cell, and the contextual mode of UE on Zu Zhong base station, source of release small-cell comprises three kinds, wherein:

First kind of way is: UE context is sent to other base stations in the group of object small-cell by described object base station, and described UE context is preserved in described other base stations; Described source base station sends and discharges the contextual message of UE to Zu Zhong base station, small-cell, source, and described other base stations discharge corresponding UE context;

The second way is: for not only in the group of small-cell, source but also in Zu Zhong base station, object small-cell, its UE context is upgraded in described object base station; For in the group of object small-cell and not in Zu Zhong base station, small-cell, source, object base station sends UE context to it; For in the group of small-cell, source and not in Zu Zhong base station, object small-cell, described source base station sends and discharges the contextual message of UE to it;

The third mode is: for not only in the group of small-cell, source but also in Zu Zhong base station, object small-cell, its UE context is upgraded in described object base station; For in the group of object small-cell and not in Zu Zhong base station, small-cell, source, object base station sends UE context to it; For in the group of small-cell, source and not in Zu Zhong base station, object small-cell, described object base station sends and discharges the contextual message of UE to it.

Preferably, the serving BS of UE knows that the mode of other base stations in its small-cell, place group comprises:

Described serving BS is known other base stations in its small-cell, place group according to configuration information;

Or described serving BS is determined base station, place, small-cell around, described community according to the community of the current access of UE, and using described base station other base stations in its small-cell, place group;

Or described serving BS is determined base station, place, small-cell around according to the measurement report of UE, and using described base station other base stations in its small-cell, place group;

Or described serving BS is known one group of small-cell base station according to configuration information, and according to the measurement report of UE, described one group of small-cell base station of configuration is filtered, obtain other base stations in its small-cell, place group.

Preferably, described UE context comprises that UE identifies at the UE of described access community at cell ID and the UE of the access community of serving BS;

Described UE context also comprises that safe context, ERAB information, the information of source MME, the UE of one or more in following information: UE limit list, UE historical information in mark, the ability of UE, the switching of source MME.

The application also provides a kind of UE of support method of fast quick-recovery, comprising:

UE sends RRC to the second base station and re-establishes request message;

The second base station is to the UE context of first this UE of base station requests; Described the first base station is the serving BS before this UE occurs unsuccessfully;

The UE context of this UE is sent to the second base station by the first base station;

RRC connection re-establishment, according to the UE context receiving, is carried out to described UE in the second base station.

Preferably, described UE context comprises that UE the cell ID of community and UE unsuccessfully occurs in the described UE mark that community unsuccessfully occurs in the first base station;

Preferably, the method further comprises:

Safety inspection is carried out to UE in described the first base station or the second base station.

Preferably, the method further comprises:

Access control inspection is carried out to UE in described the first base station or the second base station.

As seen from the above technical solution, in the time that UE moves under the scene of small-cell, the method of the fast quick-recovery of support UE that the application provides is by taking different measures, make Zu Zhong base station, relevant small-cell can get the context of UE, thereby failure occurs and carry out RRC connection reconstruction immediately at UE, the base station that makes UE carry out RRC connection re-establishment gets the context of UE, can be successful thereby RRC is re-established, avoid UE to get back to idle pulley, and avoid loss of data and guarantee business continuance.

Accompanying drawing explanation

The existing SAE system architecture diagram of Fig. 1;

The deployment scenario that Fig. 2 small-cell strengthens;

Fig. 3 the application supports the schematic diagram of the first method of the fast quick-recovery of UE;

The process schematic diagram of Fig. 4 the application UE access small-cell;

Fig. 5 the application is the synchronous contextual process schematic diagram of UE in the group of small-cell;

Fig. 6 the application upgrades the contextual process schematic diagram of UE of other base stations in the group of small-cell;

Fig. 7 the application discharges the contextual process schematic diagram of UE of other base stations in the group of small-cell;

Zu Zhong base station, Fig. 8 the application small-cell is used the contextual method schematic diagram of the UE preserving;

Between two base stations of Fig. 9 the application, exchange the process schematic diagram of small-cell group information;

Figure 10 is the process schematic diagram of the application's two base station exchange small-cell group information in X2 handoff procedure;

Figure 11 is the process schematic diagram of the application's two base station exchange small-cell group information in S1 handoff procedure;

Figure 12 the application supports the schematic diagram of the second method of the fast quick-recovery of UE;

Figure 13 the application base station obtains the schematic diagram of UE context mode one from another base station;

Figure 14 the application base station obtains the schematic diagram of UE context mode two from another base station;

Figure 15 the application base station obtains the schematic diagram of UE context mode three from another base station;

Figure 16 the application base station obtains the schematic diagram of UE context mode four from another base station.

Embodiment

For making the application's object, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the application is described in further detail.

In the time that UE moves under the scene of small-cell, likely occur unsuccessfully, in order to make UE quick-recovery soon failed in the situation that, the application provides two kinds of methods of supporting the fast quick-recoveries of UE, to avoid UE to get back to idle pulley, and avoid loss of data and guarantee business continuance.Wherein:

The main thought of first method is: in the time of UE access service base station, it is synchronous that the serving BS being accessed by UE carries out UE context to other base stations in the group of relevant small-cell, thereby in the time that UE occurs unsuccessfully to need to re-establish RRC connection, because the contextual information of UE is preserved in the base station of RRC connection re-establishment, RRC is re-established can be successful.

The main thought of second method is: in the time there is unsuccessfully to need to re-establish RRC and connect in UE, by the base station of RRC connection re-establishment to the current serving BS request UE context of UE, can be successful thereby RRC is re-established.

The common ground of above-mentioned two kinds of methods is: by taking different measures, make the base station of RRC connection re-establishment get the context of UE, can be successful thereby RRC is re-established, and avoid UE to get back to idle pulley, and avoid loss of data and guarantee business continuance.

Two kinds of methods that below the application provided are elaborated respectively.

Fig. 3 is the schematic diagram that the application supports the first method of the fast quick-recovery of UE.

Base station, place, a several small-cell small-cell group of composition (Small Cell Cluster).Small-cell group can be network according to base station, place, the several small-cell composition of geographic location area configuration, can be to be also made up of this base station, place, small-cell several small-cell base stations around for the difference of the small-cell of UE access.When UE accesses the base station of small-cell group, UE context is sent to other base stations in the group of small-cell by the serving BS that UE accesses, follow-up, in the time that UE context generation renewal maybe needs to discharge, other base stations in the serving BS notice small-cell group that UE accesses are upgraded or are discharged UE context.For example: according to Fig. 3, the synchronous UE context in base station 1 is to base station 2 and base station 3.

In above-mentioned first method, the process of UE access small-cell as shown in Figure 4, comprises the following steps:

Step 401:UE access base station 1.

Here, suppose that base station 1 is the base station of small-cell, and base station 1 is Zu Zhong base station, small-cell.

UE access base station 1 can be: in the community of base station 1, being converted to activation (Active) pattern from idle (Idle) pattern, can be also the community (in this case, base station 1 is the object base station of described switching) by switching access base station 1.

Step 402: base station 1 for example sends UE context, to other base stations in its small-cell, place group: eNB2 shown in figure and eNB3.

Wherein, described UE context comprises one or more in following information:

The safe context of-UE;

-ERAB information;

The information of-source MME;

-UE is in the mark of source MME;

The ability of-UE;

-switch and limit list;

-UE historical information.

In described UE context, also comprise UE accesses community (that is: the community that UE accesses in base station 1) cell ID in base station 1, described cell ID can be Physical Cell Identifier (PCI), can also comprise UE and access in base station 1 frequency information of community in UE context.Described cell ID can also be to strengthen Cell Global Identity (ECGI).In described UE context, also comprise UE accesses community UE mark in base station 1, described UE mark can be CRNTI.Described UE context can also comprise other UE contextual informations, and the application does not limit this.

Step 403: receive the contextual base station preservation of described UE UE contextual information.

How base station is specifically used preserved UE context, will in the embodiment of Fig. 8, describe.

Send take base station 1 below UE context to the process of base station 2 as example, base station in first method 1 is sent to UE context and describes to the process of other base stations in its small-cell, place group, as shown in Figure 5, comprise the following steps:

Process shown in Fig. 5 can occur in UE and be converted to the process of enable mode from idle pulley in the community of base station 1, also can occur in UE by the process of handoff procedure access base station 1.

Step 501: base station 1 sends UE contextual information and sends message to base station 2.

Base station 2 and base station 1 are in the group of same small-cell.Wherein, base station 1 can know that base station 2 is whether in the group of the small-cell of base station 1 according to the configuration of operator (being configuration information); Or base station 1 can be accessed the difference of community and according to determining some base stations, place, small-cell around, this community in the community of current access, and using these base stations as base station 2, send UE contextual information send message to it according to UE; Or base station, place, one group of small-cell around can be determined according to the measurement report of UE in base station 1, and using these base stations as base station 2, send UE contextual information to it and send message.It should be noted that base station 1 determines base station that group comprises, small-cell according to the measurement report of current UE, also can determine the base station that small-cell group comprises according to the measurement report of some UE of access current area; Or the base station comprising in the small-cell group of base station 1 can be known according to the configuration of operator (being configuration information) in base station 1, and then report above-mentioned base station is filtered according to the measurement of described UE or one group of UE, and determine the base station in final group.Certainly, in actual applications, can also determine Zu Zhong base station, small-cell according to other factors, the application does not limit this.

It is identical with step 402 that this UE contextual information sends the content comprising in message, repeats no more here.

Step 502: base station 2 is preserved described UE contextual information and sent the UE contextual information in message.

Step 503: base station 2 sends UE contextual information and confirms to base station 1.

The application provides two kinds of base stations 2 to respond the mode of base station 1, comprising: base station 2 sends response message and base station 2 does not send these two kinds of modes of response message, and therefore, in Fig. 5, step 503 is shown in broken lines.

Base station 1 can send to base station 2 by described UE contextual information by X2 interface, also can be transmitted to base station 2 by core net by S1 interface.

In the time that the UE contextual modifications message from MME is received in base station 1, or base station 1 receive from the ERAB for this UE of MME set up message ERAB modification message ERAB release message etc. need to upgrade UE contextual time, base station 1 is to other base station triggers UE updating context process in its small-cell, place group, as shown in Figure 6.

Step 601: base station 1 sends UE contextual information updating message to base station 2.

The UE contextual information that comprises renewal in described UE contextual information updating message, and comprise that UE accesses the cell ID of community in base station 1 and UE accesses the UE mark in community in base station 1, described UE accesses community UE mark in base station 1 can be CRNTI.The UE contextual information of described renewal can comprise one or more in the UE contextual information described in step 402.

Step 602: the UE contextual information upgrading is preserved in base station 2.

Step 603: base station 2 sends UE updating context and confirms to base station 1.

Here, the application provides two kinds of base stations 2 to respond the mode of base station 1 equally, comprising: base station 2 sends response message and base station 2 does not send these two kinds of modes of response message, and therefore, in Fig. 6, step 603 is shown in broken lines.

Base station 1 can send to base station 2 by the UE contextual information of described renewal by X2 interface, also can be transmitted to base station 2 by core net by S1 interface.

In the time that UE gets back to idle pulley from enable mode in the community of base station 1, or when UE moves away from the community of base station 1, or when UE from the community of base station 1, move away and the small-cell group at 1 place, Bu base station, object community in time, base station 1 discharges the process of UE contextual information to other base station triggers in its small-cell, place group, as shown in Figure 7.

Step 701: base station 1 sends UE context releasing request message to base station 2.In this message, comprise that UE accesses the cell ID of community in base station 1 and UE accesses the UE mark in community in base station 1, described UE accesses community UE mark in base station 1 can be CRNTI.

Receive that after UE context releasing request message, base station 2 discharges the UE context of corresponding UE.

Step 702: base station 2 sends UE context and discharges response message to base station 1.

Here, the application provides two kinds of base stations 2 to respond the mode of base station 1 equally, comprising: base station 2 sends response message and base station 2 does not send these two kinds of modes of response message, and therefore, in Fig. 7, step 702 is shown in broken lines.

Base station 1 can be by X2 interface by described UE context releasing request message to base station 2, also can be transmitted to base station 2 by core net by S1 interface.

As previously mentioned, the UE context that Zu Zhong base station, small-cell sends other base stations of preservation, preserves the contextual base station of UE below in conjunction with Fig. 8 explanation and how to use the contextual process of preserved UE, as shown in Figure 8, comprises the following steps:

Step 801: in the time that UE occurs unsuccessfully in the community of base station 1, UE sends RRC and re-establishes request message to base station 2.

RRC re-establishes in request message and comprises UE at the cell ID that community unsuccessfully occurs, and described cell ID can be PCI, and RRC re-establishes in request message can also comprise the frequency information that community unsuccessfully occurs.Described cell ID can also be ECGI.Described message also comprises UE the UE mark of community is unsuccessfully occurring, and described UE can be CRNTI in the UE mark that community unsuccessfully occurs.

Step 802: due to the safe context information that UE is preserved in base station 2, therefore, RRC re-establishes can be successful, and base station 2 sends RRC and re-establishes message to UE.

Step 803:UE sends RRC and has re-established message to base station 2.

Step 804: base station 2 transmit path handover request message are given the MME that serves UE.Here, the MME that serves UE can be known in base station 2 according to UE contextual information.

Wherein step 802 and step 804 are all outwards to send message by base station 2, and these two message itself do not have absolute sequencing.

Step 805:MME transmit path switching request acknowledgement message is to base station 2.

More than describe the process of control plane, the behavior of user plane has not been limited.The following describes the mode of operation of several user planes, these several modes of operation can further reduce loss of data, guarantee business continuance.

Mode one: base station 2 in the time that the RRC that receives step 801 re-establishes request message, up and/or descending TEID and transport layer address that distribute data forwards, and send described TEID and transport layer address to base station 1.

For descending data retransmission, if determining downlink data, base station 2 forwards, the TEID of base station 2 allocation of downlink data retransmissions and transport layer address, and send to base station 1; For up data retransmission, if base station 2 asks upstream data to forward, TEID and the transport layer address that upstream data forwards distributed in base station 2, and sends to base station 1, base station 1 to determine whether to accept upstream data forwarding.Base station 2 sends to base station 1 the mark of cell-of-origin, UE place (UE is in the Serving cell of base station 1), the mark of UE in cell-of-origin; The base station 1 data retransmission user plane that the mark described community and base station 2 are distributed according to the cell ID of receiving from base station 2 and UE, the data that start to forward described UE are to base station 2.Base station 1 sends context data and sends to base station 2, and described data send context and comprise PDCP SN and HFN.Descending PDCP SN indication need to be used for the SN of next PDCD SDU.Up PDCP SN indicates the SN of the PDCP SDU of first loss.Described data send the accepting state that context can also comprise up PDCP SDU.The data retransmission of the carrying of radio link control (RLC) affirmation mode AM can only be asked in base station 2.In order to guarantee that data order sends, base station 2 can first send the data of receiving from base station 1 to UE, then sends the data of receiving from core net to UE.

Mode two: base station 1, according to the measurement report of UE, when transmission downlink data is to UE, also sends to downlink data the good adjacent base station of signal in the group of small-cell, and send corresponding data transmission contextual information.In the time that UE re-accesses in base station 2, base station 2 sends contextual information according to the data of receiving from base station 1 and starts to send downlink data to UE, and sends corresponding upstream data bag to core net.

Mode three: core net sends data to the multiple base stations in the group of small-cell simultaneously, like this, will synchronize and receive the data of sending from core net with base station 1 in base station 2.

By process shown in Fig. 8, can guarantee that UE RRC connection re-establishes successfully, thereby make UE not get back to idle pulley, reduce loss of data, improve user's experience.

The application provides several method to make two base station exchange information of the small-cell group at place each other, is described in detail respectively below.

Fig. 9 is the schematic diagram that exchanges the method one of small-cell group information between two base stations of the application, and the method comprises:

Step 901: base station 1 sends X2 and sets up request message to base station 2, this X2 sets up the information that comprises base station 1 small-cell, place group in request message.

The packets of information of this small-cell group is containing the station list in 1 small-cell, the place group of base station, and described station list can be the list that Base Station Identification list or base station IP address list or other can identify the information of base station.The information of described small-cell group can also be the mark of small-cell group.The information of receiving is preserved in base station 2.

Step 902: base station 2 sends X2 and sets up response message to base station 1, this X2 sets up the information that comprises base station 2 small-cell, place groups in response message.

The packets of information of this small-cell group is containing the station list in 2 small-cell, the place groups of base station, and described station list can be the list that Base Station Identification list or base station IP address list or other can identify the information of base station.The information of described small-cell group can also be the mark of small-cell group.The information of receiving is preserved in base station 1.

The method two that exchanges small-cell group information between two base stations is:

In the time there is no X2 interface between base station 1 and base station 2, between base station 1 and base station 2, by core net, by S1 interface, send the small-cell group information in method shown in Fig. 9.

The method three that exchanges small-cell group information between two base stations is:

The information of base station 2 small-cell, Cell Broadcast CB place groups, it is identical that the information of described small-cell group is described with step 902.In UE access base station 1 community, read the broadcast message of 2 communities, base station, know the information of base station 2 small-cell, place groups, and the information of the small-cell group at 2 places, base station is sent to base station 1.By similar process, base station 2 can obtain the information of base station 1 small-cell, place group.

Base station 1 small-cell, place group (cluster1) may be different with base station 2 small-cell, place groups (cluster2), and the base station that the base station that base station 1 small-cell, place group comprises and base station 2 small-cell, place groups comprise may be incomplete same.By three kinds of above-mentioned methods, the information of small-cell, place, base station, opposite end group has been known in base station 1 and base station 2, in the time that UE is switched to base station 2 from base station 1, needs the synchronous UE context in base station 2 to the base station in cluster2, and need to discharge the not UE context on base station in cluster2.Be switched to the process of base station 2 from base station 1 at UE, base station 1 is the source base station switching, and base station 2 is the object base stations of switching, and below the small-cell group at the source base station place of switching is called to " small-cell, source group ", i.e. cluster1; The small-cell group at the place, object base station of switching is called " object small-cell group ", i.e. cluster2.The application specifically provides three kinds of contextual modes of synchronous UE:

The method of synchronization one: the synchronous UE context in base station 2 is to other base stations in cluster2, that is: base station 2 is to process shown in the base station execution graph 5 in cluster2.Base station 1 discharges the UE context on base station in cluster1, that is: base station 1 is to process shown in the base station execution graph 7 in cluster1.

The method of synchronization two: for the not only base station in cluster1 but also in cluster2, process shown in 2 execution graphs 6 of base station, sends UE updating context to described base station.Corresponding this method, in switching set-up procedure, source base station (for example base station 1) sends UE and for example identifies, to object base station (base station 2) at the UE of 1 community, base station at mark and the UE of 1 community, base station, base station 2 comprises described cell ID and UE mark in the message of upgrading UE context request, like this described in not only the base station in cluster1 but also in cluster2 can upgrade corresponding UE context according to the request of base station 2.For the base station in cluster1 in cluster2 and not, the process shown in 2 execution graphs 5 of base station sends UE contextual information to described base station.For the base station in cluster2 not in cluster1, process shown in 1 execution graph 7 of base station discharges the context of UE in described base station.

The method of synchronization three: for the not only base station in cluster1 but also in cluster2, process shown in 2 execution graphs 6 of base station, sends UE updating context to described base station.Corresponding this method, in switching set-up procedure, source base station (for example base station 1) sends UE and for example identifies, to object base station (base station 2) at the UE of 1 community, base station at mark and the UE of 1 community, base station, base station 2 comprises described cell ID and UE mark in the message of upgrading UE context request, like this described in not only the base station in cluster1 but also in cluster2 can upgrade corresponding UE context according to the request of base station 2.For the base station in cluster1 in cluster2 and not, the process shown in 2 execution graphs 5 of base station sends UE contextual information to described base station.For the base station in cluster2 not in cluster1, process shown in 2 execution graphs 7 of base station discharges the context of UE in described base station, corresponding this method, in switching set-up procedure, source base station (for example base station 1) sends UE and for example identifies, to object base station (base station 2) at the UE of 1 community, base station at mark and the UE of 1 community, base station, base station 2 comprises described cell ID and UE mark in the message that discharges UE context request, like this described in cluster1 not the base station in cluster2 can discharge corresponding UE context according to the request of base station 2.

Except above-mentioned several method, between two base stations, can also in X2 handoff procedure or S1 handoff procedure, exchange small-cell group information, describe in conjunction with Figure 10 and Figure 11 respectively below.

Figure 10 is that the application is switched by X2 from source base station the process that is switched to object base station at UE, and the method for two base station exchange small-cell group information, comprises the following steps.

Step 1001: source base station sends handover request message to object base station.In described message, comprise the information of small-cell, source base station place group.The content comprising in this small-cell group information is identical with step 901, repeats no more here.

Step 1002: object base station sends switching request acknowledgement message to source base station.

Alternatively, in described message, can comprise the information of small-cell, place, object base station group.The content comprising in this small-cell group information is identical with step 902, repeats no more here.

Step 1003: existing hand-off execution process.

Step 1004: existing switching complete process.

Step 1005: carry out the context synchronizing process of UE in new small-cell group.Object base station and source base station carry out the UE contextual information in synchronous other base stations according to the small-cell group information of exchange in step 1001 and/or step 1002, and the concrete method of synchronization as previously mentioned, repeats no more here.

It should be noted that, the synchronous contextual process of UE of described step 1005 can be the information exchanging according to step 1001 and step 1002, after switching completes, carries out at once; Also can be the information that does not comprise base station 2 small-cell, place groups in step 1002, switch rear base station 2 and re-executed the measuring process to UE, according to the information that measures base station 2 small-cell, place groups of UE, then carry out UE context synchronizing process.If the synchronous contextual process need of UE base station 1 participates in, base station 2 is obtaining after the information of base station 2 small-cell, place groups, can send message to base station 1 the information informing base station 1 of base station 2 small-cell, place groups.

Figure 11 is that the application is switched by S1 from source base station the process that is switched to object base station at UE, and the method for two base station exchange small-cell group information, comprises the following steps:

Step 1101: source base station sends handoff requirement message to MME.In described message, comprise the information of small-cell, source base station place group.The content comprising in this small-cell group information is identical with step 901, repeats no more here.This small-cell group information can be included in source base station in the transparent transmission device of object base station.

Step 1102:MME sends handover request message to object base station.In described message, comprise the information of small-cell, source base station place group.The content comprising in this small-cell group information is identical with step 901, repeats no more here.This small-cell group information can be included in source base station in the transparent transmission device of object base station.

Step 1103: object base station sends switching request acknowledgement message to MME.

Alternatively, in described message, can comprise the information of small-cell, place, object base station group.The content comprising in this small-cell group information is identical with step 902, repeats no more here.This small-cell group information can be included in object base station in the transparent transmission device of source base station.

Step 1104:MME sends switching command message to source base station.

If comprise the information of small-cell, place, object base station group in the switching request acknowledgement message of step 1103, so, in the switching command message of this step, also the information of small-cell, place, object base station group will be comprised.The content comprising in this small-cell group information is identical with step 902, repeats no more here.This small-cell group information can be included in object base station in the transparent transmission device of source base station.

Step 1105: carry out existing hand-off execution process.

Step 1106: carry out existing switching complete process.

Step 1107: carry out the context synchronizing process of UE in new small-cell group.Object base station and source base station carry out synchronous UE contextual information according to the small-cell group information of exchange in step 1101 and step 1102 and/or step 1103 and step 1104, and the concrete method of synchronization as previously mentioned, repeats no more here.

It should be noted that, the synchronous contextual process of UE of described step 1107 can be the information exchanging according to step 1101 to step 1104, after switching completes, carries out at once; Also can be the information that does not comprise base station 2 small-cell, place groups in step 1103 and 1104, switch rear base station 2 and re-executed the measuring process to UE, according to the information that measures base station 2 small-cell, place groups of UE, then carry out UE context synchronizing process.If the synchronous contextual process need of UE base station 1 participates in, base station 2 is obtaining after the information of base station 2 small-cell, place groups, can send message to base station 1 the information informing base station 1 of base station 2 small-cell, place groups, described message can be the message of X2 interface, can be also the message of S1 interface.

Support the first method of the fast quick-recovery of UE to have been described in detail to the application above, referring to Figure 12, support the second method of the fast quick-recovery of UE to be elaborated to the application.Shown in Figure 12, method comprises the following steps:

Step 1201: in the time that UE occurs unsuccessfully in the community of base station 1, UE carries out cell reselection, the community 2 of for example selection of base stations 2, UE sends RRC and re-establishes request message to base station 2.

RRC re-establishes in request message and comprises UE at the cell ID that community unsuccessfully occurs, and described cell ID can be PCI, and RRC re-establishes in request message can also comprise the frequency information that community unsuccessfully occurs.Described cell ID can also be ECGI.Described message also comprises UE the UE mark of community is unsuccessfully occurring, and described UE can be CRNTI in the UE mark that community unsuccessfully occurs.Described RRC re-establishes request message can also comprise the TAI that place, community unsuccessfully occurs.

Step 1202: base station 2 obtains the context of UE from base station 1, access control inspection is carried out to UE in base station 1 or base station 2, and safety inspection can also be carried out to UE in base station 1.Particularly, base station 2 obtains the context of UE and base station 1 or base station 2 carries out access control inspection to UE and has three kinds of modes from base station 1, respectively as shown in Figure 13, Figure 14 and Figure 15.Base station 1 is carried out safety inspection to UE and also will in the description of Figure 13-Figure 15, be introduced.

Follow-up, base station 1 stops sending downlink data to UE, and forwarding data is to base station 2.

Mode one as shown in figure 13, specifically comprises step: base station 2 sends UE information request message to base station 1, to ask the contextual information of UE.

In described message, comprise UE at the cell ID that community (1 community, base station) unsuccessfully occurs, described cell ID can be PCI, can also comprise the frequency information that community unsuccessfully occurs.Described cell ID can also be ECGI, or comprises PCI and ECGI simultaneously.In described message, also comprise UE in the mark that community UE unsuccessfully occurs, described UE can be CRNTI in the UE mark that community unsuccessfully occurs, and described UE can also be that UE is at the eNB of serving BS X2AP ID in the UE mark that community unsuccessfully occurs.Described message also comprises short media access control mark shortMACI.

Described message also comprises the cell ID PCI and/or the ECGI that rebuild community.

It is the eNB UE X2AP ID that UE distributes at eNB1 and eNB2 interface that described message also comprises eNB2.

Step 1302: safety inspection, access inspection are carried out to UE in base station 1, and carry out PLMN selection.

Wherein, the concrete mode that safety inspection is carried out to UE in base station 1 is: base station 1 utilizes the PCI of the failed generation community of receiving in step 1301 or ECGI, UE, at CRNTI, shortMACI that community unsuccessfully occurs, UE is carried out to safety inspection.Base station 1 is found community is unsuccessfully occurred according to the PCI that community unsuccessfully occurs, and obscures for fear of PCI, and base station 1 can be found community unsuccessfully occurs according to the ECGI of the failed generation community of receiving in step 1301 or PCI and frequency information.The context of UE is found in base station 1 at the CRNTI that community unsuccessfully occurs according to UE.Base station 1 utilizes the safe context in cell ID PCI and the UE context of rebuilding community to calculate shortMACI, if that calculate and that receive from base station 1 identical, UE is by safety inspection, otherwise UE is by safety inspection, and eNB1 sends UE information unsuccessfully to eNB2 in step 1303.

The concrete mode checking is accessed to UE in base station 1: base station 1 is accessed inspection according to rebuilding the cell ID of community and the access limitation list HRL of UE to UE.Base station 1 judges the registration PLMN(rPLMN that whether has UE in the PLMN that rebuilds Cell Broadcast CB) or equivalent PLMN(ePLMN) and rebuild in the tracing area (TA) of not forbidding at UE community and rebuild in the wireless access technology (RAT) of not forbidding at UE community.Base station 1 can obtain the cell ID of 2 communities, base station, TAC and the PLMNID list of support in X2 process of establishing, then knows the PLMN list of base station 2 Cell Broadcast CBs and the TA at place according to the PCI of 2 communities, base station of receiving in step 1301 or ECGI in conjunction with the information of X2 process of establishing acquisition.Also can in the message of step 1301, comprise the TA(TAC or the TAI that rebuild place, community) and broadcast PLMN ID list.If there is no rPLMN or the ePLMN of UE in the PLMN ID of reconstruction Cell Broadcast CB or rebuild community in the TA forbidding or rebuild in the RAT forbidding at UE community, access checks unsuccessfully, otherwise access checks successfully.Base station 1 is according to rebuilding the frequency of community or knowing the RAT rebuilding under community according to configuration.Check unsuccessfully if accessed, eNB1 sends UE information unsuccessfully to eNB2 in step 1303.Check in successful situation in access, the PLMN of service is selected in base station 1 in the PLMN that rebuilds Cell Broadcast CB for UE.Base station 1 as rPLMN, is placed on original rPLMN and other ePLMN the new PLMN selecting in HRL as ePLMN, in the message of step 1304, new HRL is issued to base station 2.

Step 1303, according to the safety inspection result of step 1302 and access check result, all successfully in situation, eNB1 sends UE information response to eNB2, checks that in safety inspection or access in unsuccessful situation, eNB1 sends UE information unsuccessfully to base station 2.

Described UE information response or UE information unsuccessfully comprise the eNB2 eNB UE S1APID that UE distributes for this reason.Described UE information response can also comprise the eNB1 eNB UE X2AP ID that UE distributes for this reason.Described UE information unsuccessfully can also comprise the reason of failure, and for example UE of malice or access do not allow.

As another execution mode of this method, check and safety inspection all in successful situation the also direct message of forwarding step 1304 of eNB1 in access.Checking that in unsuccessful situation, eNB1 does not send message to eNB2.ENB2 knows the failure of UE information request according to the mode of the realizations such as clock, re-establishes refuse information to UE thereby send RRC in step 1203.

Step 1304, eNB1 sends handover request message to eNB2.Described message can comprise eNB2 distributes to the eNB UE X2AP ID of UE.The ECGI that is designated the reconstruction community of receiving from base station 2 in step 1301 of object community in described handover request message.The security information comprising in described handover request message is according to rebuilding the PCI of community and frequency computation part out.The frequency that eNB1 can obtain rebuilding community in eNB1 and the direct X2 process of establishing of eNB2, or in step 1301, comprise the frequency of rebuilding community.

Step 1305, eNB2 sends switching request acknowledgement message to eNB1.

For rebuilding this scene, in described switching request acknowledgement message, can not comprise the transparent transmission device of object base station to source base station.

Wherein step 1305 and step 1203 are all that send base station 2, there is no in the present invention absolute sequencing, and the present invention is not restricted this.

It should be noted that, in the situation that base station 2 and base station 1 do not have X2 interface, above-mentioned step 1301 to 1305 message can send by S1 interface.Base station 2 is sending UE information request and be included in to base station 1 TAI and the ECGI of the failed generation community that step 1201 receives from UE by MME with S1 interface, TAI is for the route between core net, the MME that finds base station 1 to connect.The MME that base station 1 connects uses the ECGI that community unsuccessfully occurs to find base station 1.

Mode two as shown in figure 14, specifically comprises step:

Step 1401 is identical to step 1302 with step 1301 to step 1402, repeats no more here.It should be noted that, in the case of the access inspection or safety inspection failure of step 1402, base station 1 sends UE information unsuccessfully to base station 2 in step 1403.

Step 1403, according to the safety inspection result of step 1402 and access check result, all successfully in situation, eNB1 sends UE information response to eNB2, checks in unsuccessful situation in safety inspection or access, and eNB1 sends UE information unsuccessfully to base station 2.

Described UE information unsuccessfully comprises the eNB2 eNB UE S1AP ID that UE distributes for this reason.Described UE information unsuccessfully can also comprise the reason of failure, and for example UE of malice or access do not allow.

Described UE information response comprises the eNB2 eNB UE S1AP ID that UE distributes for this reason, and described UE information response can also comprise the eNB1 eNB UE X2AP ID that UE distributes for this reason.

In described UE info response message, comprise UE contextual information.Wherein, described UE contextual information comprises one or more information in following information:

The safe context of-UE;

-ERAB information;

The information of-source MME;

-UE is in the mark of source MME;

The ability of-UE;

-switch and limit list;

-UE historical information.

Described ERAB packets of information identifies containing ERAB, ERAB Qos information, and whether the up GTP TEID of ERAB, need downlink data to forward.

In described UE contextual information, also comprise the cell ID that community unsuccessfully occurs in base station 1 UE, described cell ID can be PCI, in UE context, can also comprise the frequency information that community unsuccessfully occurs.Described cell ID can also be ECGI.Described UE contextual information also comprises UE and unsuccessfully occurs in base station 1 the UE mark of community, and described UE mark can be CRNTI.Described UE contextual information can also comprise other UE contextual informations, and the application does not limit this.

In described UE contextual information, also comprise SN state information.Described SN state information comprises PDCP SN and HFN state information.Specifically comprise the accepting state of the up PDCP SDU that needs the ERAB of data retransmission and the COUNT value of up-downgoing.COUNT value refers to the information of PDCP SN and HFN.Descending PDCPSN indication need to be used for the SN of next PDCD SDU.Up PDCP SN indicates the SN of the PDCP SDU of first loss.Base station 2 can only ask the upstream data of the carrying of RLC affirmation mode AM to forward.In order to guarantee that data order sends, base station 2 can first send the data of receiving from base station 1 to UE, then sends the data of receiving from core net to UE.Base station 1 can send to base station 2 by SN state information by above-mentioned UE info response message, also can send by an other independent message.

Base station 1 stops sending downlink data to UE.

Step 1404, base station 2 is described ERAB Resources allocation.Base station 2 sends UE information and indicates to base station 1.The acknowledge message that described UE information indication can be step 1403 can be also independent Indication message.Described message comprises the eNB UE X2AP ID that base station 1 and base station 2 are distributed.

Described message also comprises the ERAB list of acceptance.The ERAB list of described acceptance comprises the up and/or descending GTP TEID for data retransmission.Described message can also comprise the ERAB list of not accepting.

After receiving described message, base station 1 can start forwarding data to base station 2.

Wherein step 1404 and step 1203 are all that send base station 2, there is no in the present invention absolute sequencing, and the present invention is not restricted this.

It should be noted that, in the situation that base station 2 and base station 1 do not have X2 interface, above-mentioned step 1401 to 1404 message can send by S1 interface.Base station 2 is sending UE information request and be included in to base station 1 TAI and the ECGI of the failed generation community that step 1201 receives from UE by MME with S1 interface, TAI is for the route between core net, the MME that finds base station 1 to connect.The MME that base station 1 connects uses the ECGI that community unsuccessfully occurs to find base station 1.

Mode three as shown in figure 15, specifically comprises step:

Step 1501 is identical with step 1301, repeats no more here.

Step 1502, safety inspection is carried out to UE in base station 1.Base station 1 utilizes the PCI of the failed generation community of receiving in step 1501 or ECGI, UE, at CRNTI, shortMACI that community unsuccessfully occurs, UE is carried out to safety inspection.Base station 1 is found community is unsuccessfully occurred according to the PCI that community unsuccessfully occurs, and obscures for fear of PCI, and base station 1 can be found community unsuccessfully occurs according to the ECGI of the failed generation community of receiving in step 1501 or PCI and frequency information.The context of UE is found in base station 1 at the CRNTI that community unsuccessfully occurs according to UE.Base station 1 utilizes the safe context in cell ID PCI and the UE context of rebuilding community to calculate shortMACI, if that calculate and that receive from base station 1 identical, UE is by safety inspection, otherwise UE is by safety inspection, and eNB1 sends UE information unsuccessfully to eNB2 in step 1303.

In the successful situation of safety inspection, the handover request message of base station 1 forwarding step 1503 is to base station 2.

The in the situation that of safety inspection failure, base station 1 is the message of forwarding step 1503 not.ENB2 knows the failure of UE information request according to the mode of the realizations such as clock, re-establishes refuse information to UE thereby there is RRC in step 1203.

As another implementation of the present invention, described safety inspection also can be received from the handover request message of base station 1 and carry out in step 1504 by base station 2, and this sample step can be skipped.Corresponding this mode need to comprise UE at the safe context that community unsuccessfully occurs in the handover request message of step 1503.Base station 2 utilizes the UE safe context of rebuilding the cell ID PCI of communities and receive from base station 1 to calculate shortMACI, if that calculate and in step 1201, receive from UE identical, UE is by safety inspection, otherwise UE is not by safety inspection.Base station 2 sends the reestablishment rejected message of RRC to UE in step 1203.

Step 1503, eNB1 sends handover request message to eNB2.Described message can comprise eNB2 distributes to the eNB UE X2AP ID of UE.The ECGI that is designated the reconstruction community of receiving from base station 2 in step 1301 of object community in described handover request message.The security information comprising in described handover request message is according to rebuilding the PCI of community and frequency computation part out.The frequency that eNB1 can obtain rebuilding community in eNB1 and the direct X2 process of establishing of eNB2.Or in step 1301, comprise the frequency of rebuilding community.

Base station 1 sends to base station 2 the HRL information of UE.

Step 1504, inspection is accessed to UE in base station 2.Base station 2 is accessed inspection according to rebuilding the cell ID of community and the access limitation list HRL of UE to UE.Whether base station 2 judges has the rPLMN of UE or ePLMN and rebuilds community not in the TA forbidding of UE and rebuild in the RAT not forbidding at UE community in the PLMN that rebuilds Cell Broadcast CB.If there is no rPLMN or the ePLMN of UE in the PLMN ID of reconstruction Cell Broadcast CB or rebuild community in the TA forbidding or rebuild in the wireless access technology RAT forbidding at UE community, access checks unsuccessfully.Otherwise access checks successfully.Check unsuccessfully if accessed, eNB2 sends to switch in step 1505 and prepares unsuccessfully to eNB1.Check in successful situation in access, the PLMN of service is selected in base station 2 in the PLMN that rebuilds Cell Broadcast CB for UE.Base station 2 as rPLMN, is placed on original rPLMN and other ePLMN the new PLMN selecting in HRL as ePLMN.Base station 2 is included in the new PLMN ID selecting in TAI, sends to MME in step 1206.

Step 1505, eNB2 sends switching request acknowledgement message to eNB1.ENB2 checks successfully in access, or accesses and check successfully with in the successful situation of safety inspection and send switching request acknowledgement message to eNB1.

Wherein step 1505 and step 1203 are all that send base station 2, there is no in the present invention absolute sequencing, and the present invention is not restricted this.

It should be noted that, in the situation that base station 2 and base station 1 do not have X2 interface, above-mentioned step 1501 to 1505 message can send by S1 interface.Base station 2 is sending UE information request and be included in to base station 1 TAI and the ECGI of the failed generation community that step 1201 receives from UE by MME with S1 interface, TAI is for the route between core net, the MME that finds base station 1 to connect.The MME that base station 1 connects uses the ECGI that community unsuccessfully occurs to find base station 1.

Mode four as shown in figure 16, specifically comprises step:

Step 1601, base station 2 sends Radio Link Failure Indication message to base station 1.Described message comprises PCI, UE that community unsuccessfully occurs at the shortMAC-I that the C-RNTI of community unsuccessfully occurs, receive from RRC reconstruction request message and the ECGI that rebuilds community.Described message can also comprise the ECGI that community unsuccessfully occurs.Whether described message also comprises base station 2 asks the contextual indication of UE.Base station 2, in the situation that there is no UE contextual information, comprises the contextual indication of request UE in message.Base station 2, in the case of comprising the indication of request UE contextual information, wouldn't send RRC and re-establish refuse information to UE.In the message of receiving forwarding step 1203 after the message of step 1603 to UE, if or can not receive in the situation of message of step 1603, send RRC re-establish refuse information to UE.

Step 1602, safety inspection, access inspection are carried out to UE in base station 1, and carry out PLMN selection.

When base station 1 comprises the contextual indication of request UE in the Radio Link Failure Indication message of receiving, UE is carried out to safety inspection, access inspection, and carry out PLMN selection.

The ECGI of the reconstruction community that receive from base station 2 according to step 1601 base station 1, ECGI, the PCI of 2 Serving cells, base station that obtain in recycling X2 process of establishing, the PLMN ID (s) of support and TAC, frequency information, know the PLMN ID (s) of PCI, support of reconstruction community and TAC, frequency information.

Wherein, the concrete mode that safety inspection is carried out to UE in base station 1 is: base station 1 utilizes the PCI of the failed generation community of receiving in step 1601 or ECGI, UE, at CRNTI, shortMAC-I that community unsuccessfully occurs, UE is carried out to safety inspection.Base station 1 is found community is unsuccessfully occurred according to the PCI that community unsuccessfully occurs, and obscures for fear of PCI, and base station 1 can be found community unsuccessfully occurs according to the ECGI of the failed generation community of receiving in step 1601 or PCI and frequency information.The context of UE is found in base station 1 at the CRNTI that community unsuccessfully occurs according to UE.Base station 1 utilizes the safe context in cell ID PCI and the UE context of rebuilding community to calculate shortMAC-I, if that calculate and that receive from base station 1 identical, UE is by safety inspection, otherwise UE is not by safety inspection.

The concrete mode checking is accessed to UE in base station 1: base station 1 is accessed inspection according to rebuilding the cell ID of community and the access limitation list HRL of UE to UE.Base station 1 judges the registration PLMN(rPLMN that whether has UE in the PLMNID that rebuilds Cell Broadcast CB) or equivalent PLMN(ePLMN) and rebuild in the tracing area (TA) of not forbidding at UE community and rebuild in the wireless access technology (RAT) of not forbidding at UE community.Base station 1 can obtain the cell ID of 2 communities, base station, TAC and the PLMN ID list of support in X2 process of establishing, then knows the PLMN ID list of base station 2 Cell Broadcast CBs and the TA at place according to the PCI of 2 communities, base station of receiving in step 1601 or ECGI in conjunction with the information of X2 process of establishing acquisition.Also can in the message of step 1601, comprise the TA(TAC or the TAI that rebuild place, community) and broadcast PLMN ID list.If there is no rPLMN or the ePLMN of UE in the PLMN ID of reconstruction Cell Broadcast CB or rebuild community in the TA forbidding or rebuild in the RAT forbidding at UE community, access checks unsuccessfully, otherwise access checks successfully.Base station 1 is according to rebuilding the frequency of community or knowing the RAT rebuilding under community according to configuration.Check in successful situation in access, the PLMN of service is selected in base station 1 in the PLMN ID that rebuilds Cell Broadcast CB for UE.Base station 1 as rPLMN, is placed on original rPLMN and other ePLMN the new PLMN selecting in HRL as ePLMN, in the message of step 1603, new HRL is issued to base station 2.

Check that in safety inspection and access in successful situation, the handover request message of base station 1 forwarding step 1603 is to base station 2.

Check that in safety inspection failure or access failed in the situation that, base station 1 is the message of forwarding step 1603 not.ENB2 knows the failure of UE context request according to the mode of the realizations such as clock, re-establishes refuse information to UE thereby send RRC in step 1203.

As another implementation of the present invention, described safety inspection also can be received from the handover request message of base station 1 and carry out in step 1603 by base station 2, and the safety inspection of this sample step can be skipped.Corresponding this mode need to comprise UE at the safe context that community unsuccessfully occurs in the handover request message of step 1603.Base station 2 utilizes the UE safe context of rebuilding the cell ID PCI of communities and receive from base station 1 to calculate shortMAC-I, if that calculate and in step 1201, receive from UE identical, UE is by safety inspection, otherwise UE is not by safety inspection.Base station 2 sends the reestablishment rejected message of RRC to UE in step 1203.

Step 1603, eNB1 sends handover request message to eNB2.

Corresponding another method of the present invention can not comprise the contextual indication of request UE in the message described in step 1601.Connect foundation indication if comprise RRC in the message described in step 1601, the indication of indication Radio Link Failure triggers because RRC connects foundation, and base station 1 does not need to send the message of this step.If Radio Link Failure indication triggers because RRC re-establishes request, and base station 1 do not do to the switching preparation of rebuilding community described in base station 2, and the process of this step can be triggered in base station 1.

The ECGI that is designated the reconstruction community of receiving from base station 2 in step 1601 of object community in described handover request message.The security information comprising in described handover request message is according to rebuilding the PCI of community and frequency computation part out.The frequency that eNB1 can obtain rebuilding community in eNB1 and the direct X2 process of establishing of eNB2, or in step 1301, comprise the frequency of rebuilding community.

Base station 1 sends to base station 2 the HRL information of UE.

Step 1604, eNB2 sends switching request acknowledgement message to eNB1.At eNB2 inadequate resource, under enough or other abnormal conditions, base station 2 can send to switch prepares failed message to base station 1, sends in this case the reestablishment rejected message of RRC to UE in step 1203.

Wherein step 1604 and step 1203 are all that send base station 2, there is no in the present invention absolute sequencing, and the present invention is not restricted this.

It should be noted that, in the situation that base station 2 and base station 1 do not have X2 interface, above-mentioned step 1601 to 1604 message can send by S1 interface.Base station 2 is sending the TAI and the ECGI that are included in the failed generation community that step 1201 receives from UE in Radio Link Failure is indicated to base station 1 by MME with S1 interface, TAI is for the route between core net, the MME that finds base station 1 to connect.The MME that base station 1 connects uses the ECGI that community unsuccessfully occurs to find base station 1.

Step 1203: base station 2 sends RRC and re-establishes message to UE.If the access inspection to UE in step 1202 or safety inspection failure,, in this step, base station 2 sends RRC and re-establishes refuse information to UE.

Step 1204, UE sends RRC and has re-established message to base station 2.In the situation that step 1203 receives that RRC re-establishes message, UE just sends RRC and has re-established message to base station 2.

Step 1205, carries out base station 2 and is connected reconfiguration course with the RRC between UE.Base station 2 sends RRC and connects reconfiguration message to UE, and UE sends RRC connection and reshuffled message to base station 2.

Step 1206: base station 2 transmit path handover request message are given the MME for UE service, request core net is switched descending user plane.Here the UE contextual information that, receive from base station 1 according to step 1202 base station 2 is known the MME that serves UE.

Step 1207:MME sends descending path switching response message to base station 2.

Step 1206 and step 1203 are all outwards to send message by base station 2, and these two message itself do not have absolute sequencing, and the present invention does not limit this.

Step 1208: base station 2 asks base station 1 to carry out resource release.In method provided by the invention, include this step and this step two kind of method not.If do not carry out this step, base station 1 is in the data that do not have to forward, and receives that release the final data mark (end marker) that comes from MME distributes to resource and the UE context of this UE; If carry out this step, this message is being received in base station 1, and there is no the data that can forward, and receives from the next final data mark of MME and discharges resource and the UE context of distributing to this UE.

So far, finish method flow shown in Figure 12.

The foregoing is only the application's preferred embodiment, not in order to limit the application, all within the application's spirit and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of the application's protection.

Claims

1. a method of supporting the fast quick-recovery of UE, is characterized in that, the method comprises:

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

Described UE access service base station is: UE is converted to enable mode from idle pulley in the community of described serving BS;

3. method according to claim 2, is characterized in that, the method further comprises:

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

Described UE access service base station is: UE accesses described serving BS Zhong community by switching;

5. method according to claim 4, is characterized in that, before described A, further comprises:

6. method according to claim 5, is characterized in that, described UE context is synchronized on Zu Zhong base station, object small-cell, and the contextual mode of UE on Zu Zhong base station, source of release small-cell comprises three kinds, wherein:

7. according to the method described in claim 1 to 6 any one, it is characterized in that, the serving BS of UE knows that the mode of other base stations in its small-cell, place group comprises:

8. according to the method described in claim 1 to 6 any one, it is characterized in that:

Described UE context comprises that UE identifies at the UE of described access community at cell ID and the UE of the access community of serving BS;

9. a method of supporting the fast quick-recovery of UE, is characterized in that, the method comprises:

UE sends RRC to the second base station and re-establishes request message;

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

Described UE context comprises that UE the cell ID of community and UE unsuccessfully occurs in the described UE mark that community unsuccessfully occurs in the first base station;

11. according to the method described in claim 9 or 10, it is characterized in that:

12. according to the method described in claim 9 or 10, it is characterized in that: