CN101808374B - Cell switching method and device in multi-carrier aggregation system - Google Patents
Cell switching method and device in multi-carrier aggregation system Download PDFInfo
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Abstract
The invention discloses a cell switching method of a multi-carrier aggregation system, comprising the following steps that: a switching request message transmitted to a target NB by a source NB carries a target cell identification and target cell carrier list information; a switching request determination message transmitted to the source NB by the target NB carries the target cell identification and the target cell carrier list information; the source NB transmits a switching command message containing the target cell identification and the target cell carrier list information to UE; and the process of switching the UE to a target cell corresponding to the target cell identification can be executed, therefore, carrying the carrier information in the switching process, the invention can ensure that UE with different capabilities can be switched to a correct carrier, effectively improve the service transmission efficiency of an LTE-A system and effectively ensure the switching quality.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to cell switching method and device in a kind of multi-carrier aggregation system.
Background technology
In some cases, for example, (User Equipment when UE) current place cell environment worsens, need carry out the sub-district to UE and switch when subscriber equipment.This paper is conceived to multi-carrier polymerizing (CarrierAggregation, CA) the sub-district handover scheme in the communication system, so-called CA; Be meant in same sub-district; Continuous or discrete a plurality of carrier waves are concentrated in together, when needed can be simultaneously for the UE service, so that required speed to be provided.CA is improved Long Term Evolution (Long Time Evolution Advanced; LTE-A) technology of system's introducing; Why LTE-A introduces CA, is because the peak rate of LTE-A has huge raising than LTE, requires to reach descending 1Gbps; Up 500Mbps, this can't satisfy on single carrier wave.For the UE that guarantees LTE can both work under each member carrier, each carrier wave maximum is no more than 20MHz.The CA sub-district sketch map of LTE-A is referring to Fig. 1, the LTE-A sub-district polymerization among Fig. 14 carrier waves, (Evolved Node Basement eNB) can carry out transfer of data with UE, so that throughput of system to be provided to evolved base station simultaneously on 4 carrier waves.Among this paper, so-called multi-carrier aggregation system is meant the communication system of supporting the CA function.
For the LTE-A communication system that adopts the CA technology is had a understanding; At first introduce the LTE network architecture below; Referring to Fig. 2, be evolved UMTS Access Network (Evolved UMTS TerrestrialRadio Access Network, the E-UTRAN) network architecture sketch map of LTE system.Among Fig. 2, E-UTRAN is used to realize all and evolved network function associated; (Mobility ManagementEntity MME) mainly is responsible for mobile management and session management to Mobility Management Entity, comprises the management of user's context and mobile status, distributing user identity temporary mark etc.; (Serving Gateway S-GW) is subscriber equipment (User Equipment, the UE) user entity of access core net, the interface of termination E-UTRAN to gateway; (Packet Data Network-Gateway P-GW) is user plane anchor point network element between 3GPP network and the non-3GPP network to grouped data network gateway, stops and external packet data (Packet DataNetwork, PDN) interface of network; Between S-GW and the P-GW interface can adopt GPRS Tunnel Protocol (GPRS Tunneling Protocol, GTP) or act on behalf of mobile Internet Protocol (Proxy MobileInternet Protocol, PMIP); (Home Subscriber Server HSS) is used for storing user subscription information to the user attaching server; (Policy and Charging RuleFunction PCRF) is used for policy control decision and flow based charging controlled function to the "Policy and Charging Rules Function entity; Authentication, authorize accounting server (Authentication, Authorization and Accounting Server, AAA Server) and be used for LE is carried out access authentication, mandate and billing function; (Serving GPRSswitching support node SGSN) is used for realizing functions such as GPRS network routing forwarding, mobile management and user profile storage to the service GPRS support node; UMTS Terrestrial radio access network (UMTS Terrestrial RadioAccess Network; UTRAN), GSM EDGE Radio Access Network (GSM/EDGE Radio AccessNetwork; GERAN), be used for realizing all and the wireless function associated of existing GPRS/UMTS network.Need to prove that LTE is in conceptual phase at present, Fig. 2 provides a kind of possible LTE network diagram.
Introduce the process that traditional LTE system cell switches below.
In the R8LTE system; (E-UTRAN Cell GlobalIdentifier ECGI) is used in the global unique identification sub-district cellular global identity of E-UTRAN, and this information is comprised in the system information; Send to UE by eNB, network also can carry out oam to the sub-district through ECGI.
When wireless channel environment changed, source eNB switched triggering cell, and handoff procedure generally includes to switch and prepares and switch to carry out two stages.In handoff preparation phase; Source eNB selects a suitable Target cell according to certain algorithm; Target eNB under Target cell is sent handoff request message afterwards; Requiring target eNB is that UE reserves corresponding resource, and source eNB only need inform that the selected Target cell ECGI of target eNB get final product, and target eNB just can be set up the carrier information that the cell information of preserving in the process finds this Target cell to belong to according to X2 interface before; And this carrier information sent to UE in switching command, UE will be linked into Target cell according to this information.
It is thus clear that; In R8 LTE system, UE can only work under a member carrier simultaneously, the corresponding carrier wave in LTE sub-district; Source eNB only need inform the selected ECGI of target eNB in the handoff procedure, and target eNB just can find the carrier information at this Target cell place.
If a plurality of carrier waves all use same ECGI under the same sub-district; An ECGI is with a plurality of carrier waves of correspondence so; Under this scene; For being linked into the UE of LTE-A system,, can't correctly switch to the problem on the suitable carrier wave of Target cell with existing if only identify Target cell in the handoff procedure with ECGI.It is thus clear that above-mentioned traditional LTE changing method is not suitable for the LTE-A system that has adopted CA.
Summary of the invention
The present invention provides cell switching method and device in a kind of CA system, to solve the problem that present cell switching method is not suitable for the CA system.
For this reason, the embodiment of the invention adopts following technical scheme:
Cell switching method in a kind of multi-carrier aggregation system comprises: in source NB mails to the handoff request message of target NB, carry Target Cell Identifier and target cell carrier list information; , target NB carries said Target Cell Identifier and target cell carrier list information in mailing to the switching request acknowledgement message of source NB; Source NB sends the switching command message that comprises said Target Cell Identifier and target cell carrier list information to UE; Carry out the process that said UE switches to the corresponding Target cell of said Target Cell Identifier.
The switching that is meant in the system based on X2 interface is switched in said sub-district; Said handoff request message is directly issued target NB by said source NB, and request target NB is the UE reserved resource; Said switching request acknowledgement message is after said target NB carries out acceptance judging to UE, directly to return to source NB.
Said sub-district is switched and is meant the switching that reaches system between system based on the S1 interface; Said handoff request message sends to target NB by said source NB through source MME and target MME; The process that target NB mails to source NB switching request acknowledgement message is: said target NB sends switching request acknowledgement message to target MME; Target MME sends the preceding commentaries on classics reconfiguration response message that comprises said Target Cell Identifier list information to source MME, and source MME sends the switching command that comprises said Target Cell Identifier list information to said source NB.
After the said UE of execution switches to the process of the corresponding Target cell of said Target Cell Identifier, also comprise: the carrier wave that said Target cell adopts said target cell carrier list information to confirm transmits the data of UE.
The carrier wave that said Target cell adopts said target cell carrier list information to confirm transmits the data of UE and comprises: for the UE among the LTE, the carrier wave that said Target cell adopts said target cell carrier list information to confirm transmits the data of UE; Perhaps, for the UE among the LTE-A, a plurality of carrier waves that said Target cell adopts said target cell carrier list information to confirm transmit the data of UE.
Adopt unique definite each carrier wave of the absolute wireless frequency channel of E-UTRA EARFCN in the said target cell carrier list information.
Before source NB sent handoff request message, also comprise: source NB set up the target cell information that obtains in the process according to X2 interface and confirms whether Target cell supports multicarrier; If Target cell is supported multicarrier, source NB sends the handoff request message that comprises Target Cell Identifier and target cell carrier list information, otherwise source NB sends the handoff request message that comprises Target Cell Identifier.
Sub-district device for switching in a kind of multi-carrier aggregation system is positioned at source NB side, comprising: the handoff request transmitting element is used to send the handoff request message that comprises Target Cell Identifier and target cell carrier list information; The Handover Request Acknowledge receiving element is used to receive the switching request acknowledgement message that comprises Target Cell Identifier and target cell carrier list information; The switching command message transmitting element is used for sending the switching command message that comprises said Target Cell Identifier and target cell carrier list information to user equipment (UE).
When said sub-district switched in the system switching based on X2 interface, said handoff request transmitting element directly sent said handoff request message to target NB, and said Handover Request Acknowledge receiving element directly receives said switching request acknowledgement message from target NB; When said sub-district switch in the system and system between during based on the switching of S1 interface; Said handoff request transmitting element sends said handoff request message through source Mobility Management Entity MME and target MME to target NB, and said Handover Request Acknowledge receiving element receives said switching request acknowledgement message through source MME and target MME from target NB.
Also comprise: the multicarrier judging unit; Be used for setting up the target cell information that process obtains and confirm whether Target cell supports multicarrier according to X2 interface; When definite Target cell is supported multicarrier, indicate said handoff request transmitting element, Handover Request Acknowledge receiving element and the work of switching command message transmitting element.
Sub-district switching device shifter in a kind of multi-carrier aggregation system is positioned at target NB side, comprising: the handoff request receiving element is used to receive the handoff request message that comprises Target Cell Identifier and target cell carrier list information; The Handover Request Acknowledge transmitting element is used to send the switching request acknowledgement message that comprises Target Cell Identifier and target cell carrier list information.
When said sub-district switched in the system switching based on X2 interface, NB directly received said handoff request message to said handoff request receiving element from the source, and said Handover Request Acknowledge transmitting element directly sends said switching request acknowledgement message to source NB; When said sub-district switch in the system and system between during based on the switching of S1 interface; NB receives said handoff request message to said handoff request receiving element from the source through target mobility management entity MME and source MME, and said Handover Request Acknowledge transmitting element sends said switching request acknowledgement message through target MME and source MME to source NB.
Also comprise: transmission control unit is used for confirming that according to the target cell carrier list information one or more carrier waves transmit the data of user equipment (UE).
It is thus clear that; The invention provides a kind of handover scheme of supporting the multi-carrier polymerizing sub-district, carry carrier information in the handoff procedure, can guarantee that the UE of different abilities switches on the correct carrier wave; Can effectively improve the professional efficiency of transmission of LTE-A system, effectively guarantee quality of handoff.And this scheme has good compatibility for the LTE system.
Description of drawings
Fig. 1 adopts the LTE-A sub-district sketch map of CA for prior art;
Fig. 2 is a prior art LTE system architecture sketch map;
Fig. 3 is based on the sub-district switching flow figure of X2 interface in the system;
Fig. 4 is the inventive method embodiment one flow chart;
Fig. 5 is based on the sub-district switching flow figure of X2 interface in the inventive method embodiment one system;
Fig. 6 be in the system and system between based on the sub-district switching flow figure of S1 interface;
Fig. 7 is the inventive method embodiment two flow charts;
Fig. 8 be in the inventive method embodiment two system and system between based on the sub-district switching flow figure of S1 interface;
Fig. 9 is positioned at source eNB side device internal structure sketch map for the present invention;
Figure 10 is positioned at target eNB side device internal structure sketch map for the present invention.
Embodiment
Cell switching method in the CA provided by the invention system generally, is the carrier information that in handoff procedure, is carried Target cell by source eNB, and thus, UE can switch on the suitable carrier wave of Target cell according to this carrier information.
Generally, the inventive method may further comprise the steps:
[1], source eNB carries Target Cell Identifier and target cell carrier list information in mailing to the handoff request message of target eNB;
[2], target eNB carries said Target Cell Identifier and target cell carrier list information in mailing to the switching request acknowledgement message of source eNB;
[3] source eNB sends the switching command message that comprises said Target Cell Identifier and target cell carrier list information to UE;
[4] carry out the process that said UE switches to the corresponding Target cell of said Target Cell Identifier.
Wherein, above-mentioned steps [4] is an existing procedure, mainly is given to target network element through the cell-of-origin network element before with the contextual information of UE and resource and realizes, does not go through.
Through the inventive method above-mentioned steps, after UE switched to Target cell, Target cell can transmit the data of UE according to the suitable carrier wave of carrier list Information Selection.
Those skilled in the art understand, and the sub-district is switched and can be divided into system in the sub-district based on X2 interface and switch, and, in the system/system between based on the sub-district switching of S1 interface.Wherein, the X2 handoff procedure can only be used for Intra-MME, the switching of Inter-eNB, and have X2 interface between eNB, and need not notify core net in the handoff procedure, after accomplishing, switching notifies MME by target eNB again.The handoff procedure of S1 is mainly used in Inter-MME, and the switching of Inter-eNB does not have X2 interface between eNB, relate to core net in the handoff procedure.In the face of both of these case, introduce different embodiments of the invention respectively down.
At first introduce the inventive method embodiment one.
The embodiment of the invention one is in system, to carry out improved plan on the sub-district switching flow based on X2 interface; Therefore, for the embodiment of the invention one is had better understanding, introduce at first in the existing LTE system that eNB changes and MME sub-district switching flow when constant; Referring to Fig. 3, comprising:
S301: through adhering to (Attach) or tracking area update (Tracking Area Update; TAU) process; Source eNB obtains the Zone switched restricted information (Area RestrictionProvided) of UE from MME, and is kept in context (context) information of UE;
S302: source eNB is according to Zone switched restricted information, the measuring process of configuration UE (MeasurementControl);
S303:UE is triggered to the out-hole run report (Measurement Report) of source eNB;
At S302 in the S303 implementation, can be between UE and S-GW through the source eNB transmits data packets (packet data), and source eNB can carry out up configuration (UL allocation) to LE.
S304: measurement report and provided for radio resources management (RadioResources Management, RRM) algorithm execution switch decision (HO Decision) that source eNB reports according to UE;
S305: source eNB initiates handoff request (Handover Request) message to target eNB, and requiring target eNB is the UE reserved resource, and the UE contextual information of preserving among the eNB of source is delivered to target eNB;
Wherein, the contents such as beared information, RRM context, Zone switched restriction of message and UE historical information that comprise UE among X2 signaling connection ID, Target Cell Identifier (ECGI), the source eNB in the handoff request message.
S306: target eNB is carried out acceptance judging (Admission Control) according to the beared information of the UE that receives to UE;
S307: target eNB is to return Handover Request Acknowledge (Handover RequestACK) message behind the UE reserved resource;
Wherein, The tunnel endpoint identifier that comprises the beared information that allow to switch in the switching request acknowledgement message, distributes for data forwarding (dataforwarding) (Tunnel End Pint Identifier, TEID) address and the information that need pass to UE by source eNB;
S308: source eNB sends switching command (Handover Command) message to UE;
That carries in the content of carrying in this switching command message and the switching request acknowledgement message is consistent.S309: source eNB sends SN (Sequence Number, sequence numbering) state transfer (SN StatusTransfer) message to target eNB, be used for to target eNB indication in the source accepting state of eNB upstream data and the transmit status of downlink data;
S310:UE receives and breaks off behind the switching command and being connected of source eNB, and the uplink synchronous process (Synchronization) of execution and target eNB;
S311: target eNB is returned ascending resource to UE and is distributed (UL allocation) and Timing Advance (TA);
S312:UE accomplish with Target cell synchronously after, send to switch to target eNB and confirm (HandoverConfirm) message;
S313～S317: switching has taken place in target eNB notice core net UE, and upgrades user plane path (User Plane Update);
S318: after accomplishing routing update, the context of target eNB notification source eNB source of release end UE and the resource of distributing to UE;
S319: source eNB with the UE context with distribute to the resource of UE before be given to target eNB;
S320: the context of source eNB source of release end UE and the resource of distributing to UE.
Introduce the embodiment of the invention one below and on Fig. 3 switching flow, improve cell switching method in the CA system that proposes.
In the LTE-A system; The multicarrier of a sub-district uses same ECGI; ECGI+EARFCN (E-UTRA Absolute Radio Frequency Channel Number, E-UTRA Absolute Radio Frequency Channel Number) can unique certain carrier wave of confirming under the sub-district so.Whether source eNB initiates to switch according to the measurement report judgement that UE reports; Source eNB sets up the target cell information that obtains in the process according to X2 interface and judges whether to support multicarrier; If Target cell is only supported a carrier wave; Source eNB only needs in handoff request message, to carry ECGI and other necessary informations (referring to the description of S305 to the handoff request message content); If Target cell is supported multicarrier, source eNB will support the situation of carrier wave according to the carrier capability of UE and Target cell, in handoff request message, indicate the Target Cell Identifier that need make resource reservation and the carrier information (comprising the carrier wave center frequency point information) under this cell management to target eNB; For the UE of LTE-A system, it also can be a plurality of that the carrier information that comprises can be one, and for the UE of LTE, carrier information has only one.
LTE-A requires descending peak rate to reach 1Gbps, and in the handoff procedure, the performance of downlink traffic transmission has bigger influence to user experience.If after LTE-A UE switches to Target cell, be that UE selects how to make carrier aggregation by Target cell according to the UE measured channel information again, can have a strong impact on user's impression.Downlink business transmission quality in order to guarantee to switch; Can switch to the multi-carrier polymerizing collection behind the Target cell according to a plurality of carrier waves in the UE measurement report select target sub-district as UE by source eNB; And in handoff request message, inform target eNB; Target eNB comprises carrier aggregation collection information in the switch acknowledgment message that returns to source eNB, this information will be included in the switching command that source eNB initiates and send to UE, after UE is linked into Target cell; The carrier wave that Target cell uses multi-carrier polymerizing to concentrate at once begins the joint transmission downlink data, to reach the high requirement of the descending peak rate of LTE-A.
Referring to Fig. 4, be the embodiment of the invention one flow chart, comprising:
S401: source eNB sends handoff request message to target eNB, and request target eNB is the UE reserved resource, carries Target Cell Identifier and target cell carrier list information in the said handoff request message;
S402: after target eNB is carried out acceptance judging to UE, return the switching request acknowledgement message that comprises Target Cell Identifier and target cell carrier list information to source eNB;
S403: source eNB sends the switching command message that comprises said Target Cell Identifier and target cell carrier list information to UE;
S404:UE switches to the corresponding Target cell of Target Cell Identifier, and one or more carrier waves that Target cell adopts said target cell carrier list information to confirm transmit the data of UE.
Referring to Fig. 5, be the embodiment of the invention one detail flowchart, compare main improvement with Fig. 3 and be, for the change of S505, S507～S508, all the other and existing Fig. 3 are similar, the concrete introduction as follows:
S501: through adhering to (Attach) or tracking area update (Tracking Area Update; TAU) process; Source eNB obtains the Zone switched restricted information (Area RestrictionProvided) of UE from MME, and is kept in context (context) information of UE;
S502: source eNB is according to Zone switched restricted information, the measuring process of configuration UE (MeasurementControl);
S503:UE is triggered to the out-hole run report (Measurement Report) of source eNB;
At S502 in the S503 implementation, can be between UE and S-GW through the source eNB transmits data packets (packet data), and source eNB can carry out up configuration (UL allocation) to UE.
S504: measurement report and provided for radio resources management (RadioResources Management, RRM) algorithm execution switch decision (HO Decision) that source eNB reports according to UE;
S505: source eNB initiates handoff request (Handover Request) message to target eNB, and requiring target eNB is the UE reserved resource, and the UE contextual information of preserving among the eNB of source is delivered to target eNB;
Wherein, in comprising X2 signaling connection ID, Target Cell Identifier (ECGI), source eNB, the contents such as beared information, RRM context, Zone switched restriction of message and UE historical information of UE, also comprise carrier list information in the handoff request message.
S506: target eNB is carried out acceptance judging (Admission Control) according to the beared information of the UE that receives to UE;
S507: target eNB is to return Handover Request Acknowledge (Handover RequestACK) message behind the UE reserved resource;
Wherein, Tunnel endpoint identifier (Tunnel End Pint Identifier except comprising the beared information that allow to switch, distributing for data forwarding (data forwarding) in the switching request acknowledgement message; TEID) address and need being passed to outside the information of UE by source eNB also comprises carrier list information;
S508: source eNB sends switching command (Handover Command) message to UE;
Except comprising Target Cell Identifier and other necessary informations, also comprise carrier list information in the switching command message.
S509: source eNB sends SN state transfer (SN Status Transfer) message to target eNB, be used for to the target eNB indication in the source accepting state of eNB upstream data and the transmit status of downlink data;
S510:UE receives and breaks off behind the switching command and being connected of source eNB, and the uplink synchronous process (Synchronization) of execution and target eNB;
S511: target eNB is returned ascending resource to UE and is distributed (UL allocation) and Timing Advance (TA);
S512:UE accomplish with Target cell synchronously after, send to switch to target eNB and confirm (HandoverConfirm) message;
S513～S517: switching has taken place in target eNB notice core net UE, and upgrades user plane path (User Plane Update);
S518: after accomplishing routing update, the context of target eNB notification source eNB source of release end UE and the resource of distributing to UE;
S519: source eNB with the UE context with distribute to the resource of UE before be given to target eNB;
S520: the context of source eNB source of release end UE and the resource of distributing to UE.
After accomplishing above-mentioned flow process; Promptly realized UE is switched to the flow process of Target cell; Then, Target cell will use the concentrated carrier wave of the definite carrier aggregation of carrier list information that the downlink data of UE is transmitted: for the UE among the LTE, adopt a carrier wave that its data are transmitted; For the UE among the LTE-A, adopt a plurality of carrier waves that its data are carried out descending joint transmission, to reach the high requirement of the particularly descending peak rate of up-downgoing.
Introduce the inventive method embodiment two below.
The inventive method embodiment two be in existing system and system between carry out improvedly based on the switching flow of S1 interface, therefore for the embodiment of the invention two is had good understanding, at first introduce existing switching flow based on the S1 interface, referring to Fig. 6, comprising:
S601～S603: handoff procedure is initiated in eNB decision in source; Different from after the X2 interface completion through judging that this switches, handoff request is sent to source MME initiate the handoff procedure based on the S1 interface: source MME select target MME also will comprise that the MMEUE Context of P-GW and S-GW relevant bearer information sends to target MME through preceding commentaries on classics reconfiguration request (Forward Relocation Request) message;
Particularly:
Handoff procedure is initiated in eNB decision in S601 source, after judging that this switching difference is accomplished through X2 interface, handoff request is sent to source MME initiate the handoff procedure based on the S1 interface;
S602: source eNB sends handoff request (Handover Required) message to source MME;
S603: source MME changes reconfiguration request (Forward RelocationRequest) message before target MME sends;
Alternatively; Carry out S604: only be used for the situation that S-GW reshuffles (S-GW relocation); Target MME selects a target S-GW; Send establishment to this target S-GW and carry request (CreateBearer Request), after target S-GW sets up user plane to all carryings that are sent to target MME, create carrying response (Create Bearer Response) to target MME answer;
S605: target MME sends handoff request (Handover Request) message to target eNB, requires target eNB to set up UE Context, comprises the loaded information that needs are set up; Then, target eNB is returned Handover Request Acknowledge (Handover Request ACK) message to target MME;
Alternatively, carry out S606: when changeing (indirect forwarding) before only being used for adopting indirectly, change passage before need between target MME and target S-GW, setting up;
S607: target MME reshuffles response (Forward Relocation Response) message to the preceding commentaries on classics that source MME returns Forward Relocation Request; If when using indirect forwarding, the address information of changeing passage before this step also transmits;
Alternatively, carry out S608: also be used for indirect forwarding, set up the preceding commentaries on classics passage between source MME and the source S-GW;
S609: source MME sends switching command (Handover Command) message to source eNB, is ready to except notification source eNB switches, and can notify outside UE switches, and also carries data forwarding tunnel address parameter, changes the foundation of passage before accomplishing; These two message part contents of Handover Request ACK and Handover Command are the same in this handoff procedure, arrive the transparent vessel of source eNB like beared information, data forwarding tunnel information, target eNB; It is different that partial content is also arranged, like security information.
S610: source eNB sends Handover Command to UE, informs that UE can change access network;
Alternatively, carry out S611: also be used for indirect forwarding, the forwarding data path of indication indirect forwarding and indirect forwarding;
S612:, and behind the accessed network distribution unique identification, send to switch and confirm that (Handover Confirm) message is to target eNB when UE access target access system;
S613: target eNB is sent to target MME and is switched circular (Handover Notify) message;
S614: target MME reshuffles end (Forward Relocation Complete) message informing source MME through forward pass; UE has successfully inserted goal systems; At this moment, in the MME of source, start a timer, when be used for keeping watch on the resource of source of release system;
S615～S617: target MME sends to target S-GW with eNB for carrying the tunnel address information of distributing, and sets up UE to the downlink transfer passage between the P-GW; If the S-GW reorientation, the then more carrying between fresh target S-GW and the P-GW in S616;
In addition, any time after S612, UE can initiate S618 and carry out the TAU process, upgrades the positional information among the HSS, and this is not gone through.
Introduce the embodiment of the invention two below and on Fig. 6 switching flow, improve cell switching method in the CA system that proposes.
Referring to Fig. 7, be the embodiment of the invention two flow charts, comprising:
S701: source eNB sends handoff request message to source MME; After changeing reconfiguration request message before target MME receives from source MME; Send handoff request message to target eNB, carry Target Cell Identifier and target cell carrier list information in the said handoff request message;
S702: target eNB is returned switching request acknowledgement message to said target MME, after said source MME receives the preceding commentaries on classics reconfiguration response message of said target MME, sends switching command message to said source eNB; Said switching request acknowledgement message and switching command message are carried said Target Cell Identifier and target cell carrier list information;
S703: said source eNB sends switching command message to UE, and said switching command message comprises and comprises said Target Cell Identifier and target cell carrier list information;
S704:UE switches to the corresponding Target cell of Target Cell Identifier, and one or more carrier waves that Target cell adopts said target cell carrier list information to confirm transmit the data of UE.
It is thus clear that; With among the embodiment one between source eNB and the target eNB transmission handoff request message and switching request acknowledgement message different; Among the embodiment two; Because be system in and system between based on the switching of S1 interface, therefore, transmit handoff request message and switching request acknowledgement message through the bridge between source MME, the target MME between source eNB and the target eNB.
Referring to Fig. 8, be the embodiment of the invention two detail flowcharts, compare main improvement with Fig. 6 and be S802, S805, S809, S810 in the change of S602, S605, S609, S610, all the other steps and existing Fig. 6 are similar, the concrete introduction as follows:
S801～S803: handoff procedure is initiated in eNB decision in source; Different from after the X2 interface completion through judging that this switches, handoff request is sent to source MME initiate the handoff procedure based on the S1 interface: source MME select target MME also will comprise that the MMEUE Context of P-GW and S-GW relevant bearer information sends to target MME through preceding commentaries on classics reconfiguration request (Forward Relocation Request) message;
Particularly:
Handoff procedure is initiated in eNB decision in S801 source, after judging that this switching difference is accomplished through X2 interface, handoff request is sent to source MME initiate the handoff procedure based on the S1 interface;
S802: source eNB sends handoff request (Handover Required) message to source MME;
In this handoff request message, increase carrier list information;
S803: source MME changes reconfiguration request (Forward RelocationRequest) message before target MME sends;
Wherein, comprise carrier list information in the preceding commentaries on classics reconfiguration request message.
Alternatively, carry out S804: only be used for the situation that S-GW reshuffles (S-GW relocation), target MME selects a target S-GW, and user plane is set up in all carryings that are sent to target MME;
S805: target MME sends handoff request (Handover Request) message to target eNB, requires target eNB to set up UE Context, comprises the loaded information that needs are set up; Then, target eNB is returned Handover Request Acknowledge (Handover Request ACK) message to target MME;
In this handoff request message and switching request acknowledgement message, also increased carrier list information.
Optional, carry out S806: when changeing (indirect forwarding) before only being used for adopting indirectly, change passage before need between target MME and target S-GW, setting up;
S807: target MME reshuffles response (Forward Relocation Response) message to the preceding commentaries on classics that source MME returns Forward Relocation Request; If when using indirect forwarding, the address information of changeing passage before this step also transmits;
S807 is also similar with S803, comprises two kinds of executive modes.
Alternatively, carry out S808: also be used for indirect forwarding, set up the preceding commentaries on classics passage between source MME and the source S-GW;
S809: source MME sends switching command (Handover Command) message to source eNB, is ready to except notification source eNB switches, and can notify outside UE switches, and also carries data forwarding tunnel address parameter, changes the foundation of passage before accomplishing;
These two message part contents of Handover Request ACK and Handover Command are the same in this handoff procedure, arrive the transparent vessel of source eNB like beared information, data forwarding tunnel information, target eNB; It is different that partial content is also arranged, like security information.
In this switching command message, also increased carrier list information.
S810: source eNB sends Handover Command to UE, informs that UE can change access network;
In the Handover of S810 Command, also increased carrier list information.
Alternatively, carry out S811: also be used for indirect forwarding, the forwarding data path of indication indirect forwarding and indirect forwarding;
S812:, and behind the accessed network distribution unique identification, send to switch and confirm that (Handover Confirm) message is to target eNB when UE access target access system;
S813: target eNB is sent to target MME and is switched circular (Handover Notify) message;
S814: target MME notification source MME, UE have successfully inserted goal systems, at this moment, in the MME of source, are starting a timer, when are used for keeping watch on the resource of source of release system;
S815～S817: target MME sends to target S-GW with eNB for carrying the tunnel address information of distributing, and sets up UE to the downlink transfer passage between the P-GW; If the S-GW reorientation, the then more carrying between fresh target S-GW and the P-GW in S616;
In addition, any time after S812, UE can initiate S818 and carry out the TAU process, upgrades the positional information among the HSS, and this is not gone through.
Thus; For switching based on the sub-district of S1 interface in the system and between system; Will be in the handoff request message of S802 and the source eNB in the handoff request message of S805 in the transparent vessel of target eNB, increase carrier list information; Target eNB will be carried carrier list information in S805 target eNB in the switching request acknowledgement message that target MME returns in the transparent vessel of source eNB, source eNB sends to UE with carrier list information in the switching command message of S810.
Corresponding with said method, the present invention also provides sub-district device for switching in the multi-carrier aggregation system.Particularly, comprise source eNB and target eNB.
Referring to Fig. 9, be source eNB device internal structure sketch map, this device can be meant source eNB itself, also can be to be positioned at the inner functional entity of source eNB, can pass through hardware, software and software and hardware combining and realize.Can know that by Fig. 9 this device comprises:
Handoff request transmitting element 901 is used to send the handoff request message that comprises Target Cell Identifier and target cell carrier list information;
Handover Request Acknowledge receiving element 902 is used to receive the switching request acknowledgement message that comprises Target Cell Identifier and target cell carrier list information;
Switching command message transmitting element 903 is used for sending the switching command message that comprises said Target Cell Identifier and target cell carrier list information to user equipment (UE).
Wherein,
When said sub-district switches in the system switching based on X2 interface; Handoff request transmitting element 901 is directly to send said handoff request message to target eNB, and Handover Request Acknowledge receiving element 902 is directly to receive said switching request acknowledgement message from target eNB;
When said sub-district switch in the system and system between during based on the switching of S1 interface; Handoff request transmitting element 901 is to send said handoff request message through source MME and target MME to target eNB, and Handover Request Acknowledge receiving element 902 is to receive said switching request acknowledgement message through source MME and target MME from target eNB.
Preferably, this device also comprises:
Referring to Figure 10, be target eNB device internal structure sketch map, this device can be meant target eNB itself, also can be to be positioned at the inner functional entity of target eNB, can pass through hardware, software and software and hardware combining and realize.Can know that by Figure 10 this device comprises:
Handoff request receiving element 1001 is used to receive the handoff request message that comprises Target Cell Identifier and target cell carrier list information;
Handover Request Acknowledge transmitting element 1002 is used to send the switching request acknowledgement message that comprises Target Cell Identifier and target cell carrier list information.
Wherein,
When said sub-district switched in the system switching based on X2 interface, handoff request receiving element 1001 was that eNB directly receives said handoff request message from the source, and Handover Request Acknowledge transmitting element 1002 is directly to send said switching request acknowledgement message to source eNB;
When said sub-district switch in the system and system between during based on the switching of S1 interface; Handoff request receiving element 1001 is that eNB receives said handoff request message from the source through target MME and source MME, and Handover Request Acknowledge transmitting element 1002 is to send said switching request acknowledgement message through target MME and source MME to source eNB.
Preferably, the device that is positioned at the target eNB side also comprises:
It is thus clear that; The invention provides a kind of handover scheme of supporting the multi-carrier polymerizing sub-district, carry carrier information in the handoff procedure, can guarantee that the UE of different abilities switches on the correct carrier wave; Can effectively improve the professional efficiency of transmission of LTE-A system, effectively guarantee quality of handoff.And this scheme has good compatibility for the LTE system.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (10)
1. cell switching method in the multi-carrier aggregation system is characterized in that, comprising:
Source NB sets up the target cell information that obtains in the process according to X2 interface and confirms whether Target cell supports multicarrier; If Target cell is supported multicarrier, then, source base station NB carries Target Cell Identifier and target cell carrier list information in mailing to the handoff request message of target NB;
, target NB carries said Target Cell Identifier and target cell carrier list information in mailing to the switching request acknowledgement message of source NB;
Source NB sends the switching command message that comprises said Target Cell Identifier and target cell carrier list information to user equipment (UE);
Carry out the process that said UE switches to the corresponding Target cell of said Target Cell Identifier;
The carrier wave that said Target cell adopts said target cell carrier list information to confirm transmits the data of UE.
2. according to the said method of claim 1, it is characterized in that the switching that is meant in the system based on X2 interface is switched in said sub-district;
Said handoff request message is directly issued target NB by said source NB, and request target NB is the UE reserved resource;
Said switching request acknowledgement message is after said target NB carries out acceptance judging to UE, directly to return to source NB.
3. according to the said method of claim 1, it is characterized in that said sub-district is switched and is meant the switching that reaches system between system based on the S1 interface;
Said handoff request message sends to target NB by said source NB through source Mobility Management Entity MME and target MME;
The process that target NB mails to source NB switching request acknowledgement message is: said target NB sends switching request acknowledgement message to target MME; Target MME sends the preceding commentaries on classics reconfiguration response message that comprises said Target Cell Identifier list information to source MME, and source MME sends the switching command that comprises said Target Cell Identifier list information to said source NB.
4. according to the said method of claim 3, it is characterized in that the carrier wave that said Target cell adopts said target cell carrier list information to confirm transmits the data of UE and comprises:
For the UE among the long evolving system LTE, the carrier wave that said Target cell adopts said target cell carrier list information to confirm transmits the data of UE;
Perhaps, for the UE among the improved long evolving system LTE-A, a plurality of carrier waves that said Target cell adopts said target cell carrier list information to confirm transmit the data of UE.
5. according to claim 1,2 or 3 said methods, it is characterized in that, adopt unique definite each carrier wave of E-UTRA Absolute Radio Frequency Channel Number EARFCN in the said target cell carrier list information.
6. according to claim 1,2 or 3 said methods, it is characterized in that, before source NB sends handoff request message, also comprise:
If Target cell is not supported multicarrier, source NB sends the handoff request message that comprises Target Cell Identifier.
7. sub-district device for switching in the multi-carrier aggregation system is positioned at source base station NB side, it is characterized in that, comprising:
The handoff request transmitting element is used to send the handoff request message that comprises Target Cell Identifier and target cell carrier list information;
The Handover Request Acknowledge receiving element is used to receive the switching request acknowledgement message that comprises Target Cell Identifier and target cell carrier list information;
The switching command message transmitting element is used for sending the switching command message that comprises said Target Cell Identifier and target cell carrier list information to user equipment (UE);
When said sub-district switched in the system switching based on X2 interface, said handoff request transmitting element directly sent said handoff request message to target NB, and said Handover Request Acknowledge receiving element directly receives said switching request acknowledgement message from target NB;
When said sub-district switch in the system and system between during based on the switching of S1 interface; Said handoff request transmitting element sends said handoff request message through source Mobility Management Entity MME and target MME to target NB, and said Handover Request Acknowledge receiving element receives said switching request acknowledgement message through source MME and target MME from target NB.
8. according to the said device of claim 7, it is characterized in that, also comprise:
The multicarrier judging unit; Be used for setting up the target cell information that process obtains and confirm whether Target cell supports multicarrier according to X2 interface; When definite Target cell is supported multicarrier, indicate said handoff request transmitting element, Handover Request Acknowledge receiving element and the work of switching command message transmitting element.
9. sub-district switching device shifter in the multi-carrier aggregation system is positioned at target BS NB side, it is characterized in that, comprising:
The handoff request receiving element is used to receive the handoff request message that comprises Target Cell Identifier and target cell carrier list information;
The Handover Request Acknowledge transmitting element is used to send the switching request acknowledgement message that comprises Target Cell Identifier and target cell carrier list information;
When said sub-district switched in the system switching based on X2 interface, NB directly received said handoff request message to said handoff request receiving element from the source, and said Handover Request Acknowledge transmitting element directly sends said switching request acknowledgement message to source NB;
When said sub-district switch in the system and system between during based on the switching of S1 interface; NB receives said handoff request message to said handoff request receiving element from the source through target mobility management entity MME and source MME, and said Handover Request Acknowledge transmitting element sends said switching request acknowledgement message through target MME and source MME to source NB.
10. according to the said device of claim 9, it is characterized in that, also comprise:
Transmission control unit is used for confirming that according to the target cell carrier list information one or more carrier waves transmit the data of user equipment (UE).
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| CN2009100773206A CN101808374B (en) | 2009-02-17 | 2009-02-17 | Cell switching method and device in multi-carrier aggregation system |
| PCT/CN2010/070630 WO2010094235A1 (en) | 2009-02-17 | 2010-02-11 | Method and system for supporting carrier aggregation during handover procedure |
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| CN102026324B (en) | 2009-09-18 | 2014-01-29 | 电信科学技术研究院 | Method, equipment and system for reconfiguring aggregated cell |
| CN102547886B (en) * | 2010-12-30 | 2014-11-26 | 鼎桥通信技术有限公司 | Method for mobile user equipment to transfer among cells and cell-crossing system |
| JP5667011B2 (en) * | 2011-08-12 | 2015-02-12 | シャープ株式会社 | COMMUNICATION SYSTEM, MOBILE STATION DEVICE, BASE STATION DEVICE, SYNCHRONIZATION MANAGEMENT METHOD, AND INTEGRATED CIRCUIT |
| CN103906159B (en) * | 2012-12-31 | 2017-11-21 | ***通信集团江苏有限公司 | Different systems network reselection method, multimode terminal and system |
| CN105072590B (en) * | 2015-09-09 | 2019-03-19 | 武汉虹信通信技术有限责任公司 | Multi-user's frequency point interlock method and system in a kind of point-to-multipoint microwave telecommunication system |
| WO2017201700A1 (en) * | 2016-05-26 | 2017-11-30 | 华为技术有限公司 | Cell handover method and base station |
| CN107666695B (en) * | 2016-07-27 | 2020-11-20 | 中兴通讯股份有限公司 | Network switching method and device |
| CN113676972A (en) * | 2016-08-10 | 2021-11-19 | 日本电气株式会社 | Wireless access network node and method thereof |
| CN110719606B (en) * | 2018-07-12 | 2023-04-07 | 成都鼎桥通信技术有限公司 | Cross-cell mobility method based on asymmetric uplink carrier aggregation |
| CN113133071B (en) * | 2020-01-16 | 2022-05-20 | 大唐移动通信设备有限公司 | Data forwarding method and base station |
| WO2021184281A1 (en) * | 2020-03-19 | 2021-09-23 | 华为技术有限公司 | Cell switching method and apparatus |
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