CN101626565A - Method for switching group users in mobile-relay system - Google Patents
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Abstract
The invention discloses a method for switching cells of group users in a wireless communication system, relating to the technology of wireless communication. The method comprises the following steps: accessing the group users via a mobile-relay node and establishing a user information list stored in an ACTIVE mode on the mobile-relay node andbase stations, initializing the list when the users establish RRC connection with the mobile-relay node, automatically updating during switching; during switching execution, completing the context synchronization between the source base station and subordinate users of the mobile-relay node via information in the ACTIVE list by a source base station so as to enable users data transmission not to be broken, and reestablishing the context synchronization of the subordinate users by using the information in the ACTIVE list by the mobile-relay node after completing the switching among the base stations. The invention can be used in the mobile-relay system, can realize cross-regional soft switching of the group users and solves the problem of continuity met by the group users during switching.
Description
Technical field
The present invention relates to mobile communication technology, be specifically related to the mobile management technology of mobile relay system.
Background technology
Along with the development of mobile communication, need the covering of three-dimensional to satisfy growing covering and capacity requirement.On the one hand, following mobile radio system has proposed very high power system capacity requirement, on the other hand, is enough to support possible can only the finding in higher frequency band of big bandwidth spectrum of high power capacity, and the path loss of high like this frequency range and penetration loss are all bigger, are difficult to realize good covering.Except using technology such as OFDMA, MIMO based on the base station, smart antenna, transmit diversity expand the coverage area, can also adopt relaying technique to improve power system capacity and covering.
As everyone knows, the radio wave frequency is high more, along with the speed of range attenuation is fast more.It is very limited that this specific character of radio wave has caused being operated in the coverage of mobile communication base station of high frequency band.Therefore, the appearance of wireless relay system has solved this problem effectively.In LTE-A motion and WiMax standard, all propose to use mobile via node to solve group user's mobility problem in addition, and also proposed relevant handover management scheme.The application for a patent for invention of Huawei Tech Co., Ltd " wireless relay system and realization downlink data transmitting method and relay base station " (number of patent application: 200610150671.1, open day: when on April 30th, 2008) the mobile via node of a kind of solution of proposition switches, guarantee the successional method of downlink data transmission.When disclosing mobile via node and switching, its subordinate's user node switches together thereupon, and mobile via node can be used as the merging processing unit of a plurality of user messages.Before mobile node switched, serving BS can send the current information position mark of portable terminal by via node; After switching was finished, portable terminal sent to target BS with described current information position mark by mobile via node; Target BS continues to send downlink data to portable terminal according to the current information position mark of receiving then.In this method, need user terminal oneself storage and update calculation current information position mark, this can increase the complexity of terminal greatly, and here data are also just transmitted in the main effect of mobile via node, do not make full use of the function of relaying; Secondly the subject matter of its solution is the transmission problem of downlink data in the wireless relay system, and is not suitable for transmission of uplink data.
In existing technical specification and standard, for single UE (user) at eNB (evolved NodeB, enode b) handover scheme between and flow process thereof have had the standard (as shown in Figure 1) of moulding, and whole process can be divided into three phases: switch and prepare, switch and carry out, switch and finish.Wherein handoff preparation phase comprises 301,302 two steps, the main function that realizes measurement; In handover execution stage, step 303-307 comprises: switch decision and send handoff request, disconnect connection to UE, what adopt is direct-cut operation, and in order to prevent loss of data, the forwarding and the buffer memory (step 309 of the user data of the base station (target eNB) after switch, base station (source eNB) before switching have been carried out, shown in 310), and in order to guarantee the continuity of data, source eNB has transmitted the SN state information (step 308) of UE data, make target BS know that in advance the PDCP SN of UE up-downgoing transmits situation, comprise the up PDCP SN of first UE that source eNB loses, and the descending PDCP SN of last UE of source eNB forwarding; Step 312-315 switches the process that the stage of finishing comprises the renewal and the release of source eNB resource of network survey, wherein the renewal of network side is actually the process of a routing update, after renewal is finished, the data that send to UE will be routed to target eNB, transmit user data by target eNB, source eNB then discharges all with user-dependent resource.So far finished the transregional direct-cut operation of a UE.
When relating to the group user when moving, the use of via node has been proposed in LTE-A motion and WiMax standard, it uses scene as shown in Figure 2.A large number of users is with the form high-speed motion (for example on train or subway) of a group, consideration has added a mobile via node MRN on this group, groups of mobile subscribers is linked to each other with eNB by MRN, can increase the throughput of system like this, also can reduce the interruption of switching.Simultaneously (LTE-A and WiMax) is defined as relaying in existing technical specification: 1. for the user, MRN serves as the function of base station; 2. for eNB, MRN just is equivalent to a user.Therefore the changing method of organizing the user is the same with the changing method of unique user on the cardinal principle flow process, still will adopt this method for hard switching shown in Figure 1.
But when the user organized in switching, still there was very big problem in the switching then of mobile relaying.Need being connected of disconnection earlier and source eNB when at first MRN switches, the line data of going forward side by side is transmitted and metadata cache, in data forwarding and buffer memory, exist the data of a large number of users need transmit and buffer memory so, how to guarantee that at this moment the continuity of data just has problems.When unique user switches, can make target eNB learn the forwarding of data situation in advance by step 308, but when a large number of users data wait for to be transmitted, still use the words of this forwarding and caching method, the SN information of a large amount of UE data can increase the complexity of algorithm greatly, thereby increased time delay for switching, made probability of call also increase greatly.Especially for the very strong business of some real-times (for example VoIP), may cause the serious decline of service quality.
At present,, still there is not ripe implementation in the existing technology for group user's switching, especially aspect the continuity of data forwarding, packet loss and do not have the not solution of problem of duplicate packages not.
Summary of the invention
The present invention is directed in the prior art when user's group when switching exists the data of a large number of users need transmit with buffer memory, adopt direct-cut operation can not guarantee the continuity of data, and increase time delay for switching, problems such as service quality is low, propose a kind of group of user's handover scheme, realized group user's transregional soft handover, reduced the probability of loss of data and conversation loss, guaranteed the continuity of user data, solved because a series of problems that direct-cut operation brings.
The technical scheme that the present invention solves the problems of the technologies described above is to propose the changing method of group user in a kind of mobile relay system.The method comprising the steps of, in base station and mobile via node, set up the user list of ACTIVE pattern of a synchronous and mobile via node of fast context that is used for preserving source base station and user and user's the synchronous needed user profile of fast context, wherein user profile comprises, the forwarding state of the user data that the forwarding state of the user data of first user uplink that lose each user's current access point and last user are descending.This ACTIVE tabulation can be set up with mobile via node the user and is initialised when RRC is connected, and is updated when switching; In handover execution stage, when mobile via node did not also have to disconnect with being connected of source base station, the user profile during source base station is tabulated by ACTIVE was finished with mobile relaying subordinate user's context synchronous, and user data directly transmits by source base station.Source eNB is by looking into the user profile that the ACTIVE tabulation obtains the ACTIVE pattern, and subordinate UE quick and MRN is synchronous, and the RRC that sets up between UE and the source eNB connects.The user is under the connection of MRN for group, and when the switching that switches to target eNB from source eNB was carried out, the resource of MRN subordinate UE was managed by MRN, and the information interaction between source eNB and the target eNB is transmitted by X2 interface.Mobile via node is finished the switching between source base station and target BS, and the ACTIVE tabulation is updated when switching; Mobile via node is finished after the switching between source base station and the target BS, and mobile relaying finishes by the user profile in the ACTIVE tabulation that to rebulid context synchronous with the user.Switching the starting stage of taking place, upgrading the ACTIVE tabulation by mobile via node; In handover execution stage, upgrade the ACTIVE tabulation by source base station; Finish the stage in switching, source base station is transmitted to target BS to the ACTIVE tabulation of upgrading later, is transmitted to mobile via node again by target BS.
The update method of ACTIVE tabulation comprises: switching the starting stage of taking place, when mobile via node is not also followed the source base station decoupling, upgrading the ACTIVE tabulation by mobile via node; In handover execution stage, when user data is transmitted by source base station, upgrade the ACTIVE tabulation by source base station; Finish the stage in switching, source base station is transmitted to target BS to the ACTIVE tabulation of upgrading later, is transmitted to mobile via node again by target BS.
On the other hand, after the source base station handover decisions source base station and mobile via node disconnect be connected before, it is synchronous that source base station and mobile via node subordinate user set up context, make like this source base station and mobile via node disconnect be connected after, user data can directly send to the subordinate user of mobile via node from source base station, thereby does not need to carry out the forwarding and the buffer memory of user data again; In addition, mobile via node finish between the base station switch after, it is synchronous only need to rebulid user's context, promptly can restart to transmit data for the user.
Because mobile via node has switched to target BS, and the tabulation of the ACTIVE after upgrading is on source base station, the target BS so the ACTIVE after must upgrading by the forwarding of the interface between source base station and the target BS tabulates, and then being transmitted to mobile via node by target BS, mobile like this via node could use the ACTIVE tabulation of upgrading later when synchronous setting up with subordinate user.Mobile via node finish with the reconnecting of subordinate user after, data are transmitted by mobile via node again, and the user's data transmission does not have buffer memory not interrupt yet in whole handoff procedure, so the continuity of user data also is guaranteed.
From technique scheme as can be seen, the transregional soft handover that the present invention can realization group user, when mobile via node was done direct-cut operation, its subordinate's user did not end the transmission of data; After mobile via node was finished switching, user data was transmitted by mobile via node again.And because the user only considers the system message of mobile via node, and mobile via node is static with respect to the user, so the system message of the mobile via node that the user receives also is constant, therefore the user does not participate in the switching of mobile via node directly, thereby make the switching of mobile relaying between the base station to carry out fast, save the time that user data is handled, significantly reduced the handover delay of mobile via node.
Description of drawings
The schematic diagram of the switching flow of single mobile node in Fig. 1 prior art standard
A kind of wireless mobile via node of Fig. 2 is as the application scenarios of group user access point
One of Fig. 3 comprises the network topology structure schematic diagram of the wireless relay system of fixed relay node and mobile via node
Fig. 4 is used for the switching flow schematic diagram that the mobile via node of mobile relay system and subordinate thereof organize the user
Fig. 5 is used for the switching flow block diagram that the mobile via node of mobile relay system and subordinate thereof organize the user
Embodiment
For making the purpose, technical solutions and advantages of the present invention express clearlyer, the present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
The specific embodiment of the invention adopts 3GPP (third generation partner program) LTE-A system as mobile relay system of the present invention, but content of the present invention is not limited thereto system.Fig. 3 is a kind of network topology structure schematic diagram that comprises the mobile relay system of via node (comprising fixed relay node and mobile via node), a kind of topological structure for the LTE-A system, the system configuration of LTE-A is not also decided fully at present, therefore, the present invention is directed to wherein a kind of structure specifically describes enforcement of the present invention.
Network shown in Figure 3 comprises a plurality of base stations (eNB), a plurality of via node (RN or MRN), a plurality of portable terminal (UE) and a network node (gateway aGW).ENB (evolved Node B wherein, enode b) be to realize conventional wireless electricity base station (Node B among the LTE-A, Node B) and traditional RNC (Radio Network Controller, radio network controller) evolved base station of function, therefore the task of many RRMs all is to hand over to eNB to finish, and eNB also is responsible for realizing Radio Resource control, access control, load balance and locomotive function in addition.Because eNB must possess such strong functions and performance, so it is very complicated, also is very crucial in a LTE-A framework entity.RN is via node (Relay Node), MRN is mobile via node (Mobile Node), it is awfully hot a kind of technology of discussing in the nearest 3GPPLTE-A meeting, can be divided into the L1/L2/L3 relaying, wherein the L1 relaying is one deck relaying, have only simple data forwarding function, be equivalent to the transparent mode relaying described among the IEEE 802.16j, so L1 relaying and be not suitable for doing mobile relaying; L2 layer relaying is the signaling that can handle some link layers on the basis of transparent forwarding, also is not suitable for doing mobile via node; L3 layer relay function is powerful, and the PCID of oneself is arranged, and can carry out resource management for subordinate UE, can be used as mobile via node.Link and the link between the RN-to-UE between the eNodeB-to-RN are the same, so the RN network can be regarded as MBSFN (Multicast Broadcast Single Frequency Network, multicast broadcast single frequency network), eNB uses identical frequency with subordinate's RN.
Gateway aGW realizes the access function of E-UTRAN Access Network and core net, can regard the node of network side as.The function that can realize mainly contains: the mobile management between 3GPP, bag route and forward direction shift, the transmitting stage bag mark of up-downgoing and exchange subscriber with the relevant charge information of QoS classification logotype between operator etc.
The S1 interface is the interface between gateway aGW and the eNB, the transfer function of user data between eNB and the aGW is provided, the transmission of S1 interface user plane (S1-UP) is based on the IP transmission, on the UDP/IP agreement, adopt GPRS user-plane tunnel agreement (GPRS Tunneling Protocol for User Plane, GTP-U) transmit user plane PDU between aGW and the eNB, the control plane of S1 interface can provide IP-based addressing UE contextual function simultaneously.
X2 interface is realized interconnected between the eNB, can well support the mobile management function of the LTE-A connecting system inside of UE under the ACTIVE state, be mainly reflected in switch in the engineering by source eNB to the target eNB context transfer and source eNB and target eNB between the control of user-plane tunnel.The principle consistent with the S1 interface adopted in the definition of X2 interface, its user-plane protocol structure and control plane infrastructure protocol and S1 interface are all similar, the user plane of X2 interface (X2-UP) provides the user data transport function between the eNB, the data of X2-UP transmit the transmission that also is based on IP, and employing GTP-U transmits the user PDU between the eNB on the UDP/IP agreement; For X2 interface control plane dedicated process, need use source eNB communication context sign and target eNB communication context to identify the X2 control plane signaling transmission bearer of distinguishing different UEs, wherein source eNB communication context sign is distributed by source eNB, target eNB communication context sign is distributed by target eNB, and communication context is identified in separately the X2 interface application layer messages and transmits.
The application scenarios that is a kind of wireless mobile via node that obtains according to 3GPP LTE-A system as the group user access point shown in Figure 2.
As shown in Figure 2, the user is under the connection of MRN for group, and eNB switches to target eNB from the source, and during proper communication, the data of MRN subordinate UE are only transmitted by MRN, switches when carrying out, and can temporarily transmit data by source eNB.For eNB, MRN is equivalent to a user that data volume is very big, and eNB need carry out resource allocation and scheduling of resource to it, but does not directly relate to MRN subordinate UE, the resource of MRN subordinate UE is managed by MRN, and the information interaction between source eNB and the target eNB is transmitted by X2 interface.
At first, in base station and mobile via node, set up the user list of ACTIVE (activate/effectively) pattern of a synchronous and mobile via node of fast context that is used for preserving source base station and user and user's the synchronous needed user profile of fast context, this ACTIVE tabulation can be set up RRC (radio resource control) with mobile via node the user and is initialised when being connected, and is updated when switching.The update method of ACTIVE tabulation comprises: switching the starting stage of taking place, when mobile via node is not also followed the source base station decoupling, upgrading the ACTIVE tabulation by mobile via node; In handover execution stage, when user data is transmitted by source base station, upgrade the ACTIVE tabulation by source base station; Finish the stage in switching, source base station is transmitted to target BS to the ACTIVE tabulation of upgrading later, is transmitted to mobile via node again by target BS.
The content of ACTIVE tabulation will directly influence synchronous speed and quality.
Increase the ACTIVE tabulation on MRN and eNB, the content of this tabulation is as shown in table 1.
Table 1: ACTIVE example lists of the present invention
Wherein current access point ID is MRN sub-district ID or eNB sub-district ID, and when the data of UE were transmitted by MRN, the current access point was MRN, and ID is MRN sub-district ID; When the data of UE were directly transmitted by eNB, the current access point was eNB, and ID is eNB sub-district ID.In same sub-district, cell-radio network identifier C-RNTI (Cell Radio Network Temporary Identifier) can be used for the unique identification user, and each C-RNTI is 16bit.PDCP SN state is divided into up UL and descending DL data forward state, PDCP SN (the PDCP SNof the first missing UL SDU) at up first up SDU that loses of record, at descending PDCP SN (the PDCP SN of the last transmitting DL SDU) that writes down the descending SDU of last forwarding, even when not supporting ARQ/HARQ in system like this, can finish the forwarding of the correct nothing repetition of data equally.System frame number SFN (System Frame Number) is comprised in the system message broadcasts (corresponding physical channel P-CCPCH) to whole sub-district on the BCH channel, UE carries out the sub-district and reads from P-CCPCH when synchronous, herein, because all MRN subordinate UE belong under the same sub-district, so the SFN in the system message also is the same, can when tabulating, initialization ACTIVE just write up, just can understand again in the time of synchronously, save a large amount of locks in time without each user receiving system message again.Secure identifier is a safety certification of sub-district, definitely is a secure ID algorithm (security algorithmidentifiers).IE " Frequency info ", wherein IE (Information element) is an information element, Frequency info is a spectrum information, the employed frequency of frequency spectrum resource of indication user data.
Figure 4 shows that and be used for the switching flow schematic diagram that mobile via node of mobile relay system and subordinate thereof organize the user according to the present invention.Step 401-407:MRN receives the measurement control messages that is sent by source eNB, carry out handover measurement, MRN sends measurement report message to source eNB, the report measurement result, send to source eNB, source eNB makes and switches decision and notification target eNB, and target eNB is returned handoff response, source eNB sends and the UE synchronization request to MRN, and MRN is to the synchronous announcement of UEs transmission with source eNB.
On the other hand, after the source base station handover decisions source base station and mobile via node disconnect be connected before, source base station and mobile via node subordinate user set up context (step 408) synchronously, make like this source base station and mobile via node disconnect be connected after, user data can directly send to the subordinate user of mobile via node from source base station, thereby does not need to carry out the forwarding and the buffer memory of user data again.
Step 409-416: source eNB sends to switch to MRN and connects, MRN disconnects connection, and with the target eNB downlink synchronization, MRN sends to switch to target eNB and confirms, carry out routing update by network side, send end data and return identifier, source eNB sends the ACTIVE list state to target eNB, again the ACTIVE list state is forwarded to MRN.Because mobile via node has switched to target BS, and the tabulation of the ACTIVE after upgrading is on source base station, the target BS so the ACTIVE after must upgrading by the forwarding of the interface between source base station and the target BS tabulates, and then being transmitted to mobile via node by target BS, mobile like this via node could use the ACTIVE tabulation of upgrading later when synchronous setting up with subordinate user.
In addition, mobile via node finish between the base station switch after, only need between UEs and MRN, rebulid user's context (step 417,418) synchronously, both can restart to transmit data for the user.At last, target eNB discharges resource (step 419).
Mobile via node finish with the reconnecting of subordinate user after, data are transmitted by mobile via node again, and the user's data transmission does not have buffer memory not interrupt yet in whole handoff procedure, so the continuity of user data also is guaranteed.
Below be example with the LTE-A mobile communication system, group user's handoff procedure is described in detail.
Fig. 5 is the switching flow block diagram that the mobile via node of LTE-A mobile communication system and subordinate thereof organize the user that is used for according to the embodiment of the invention.Group user's transregional soft handover may further comprise the steps:
Step 601:MRN receives the measurement control messages that is sent by source eNB, carries out handover measurement.In this step, the system message that MRN can reception sources eNB and measure control messages and decode is carried out handover measurement, and its measuring process is the same with the measurement of the UE that introduces in the 3GPP R8 version.
Step 602:MRN sends measurement report message to source eNB, the report measurement result.MRN sends to source eNB to measurement result by measurement report message.
Step 603: source eNB switches decision, and notification target eNB carries out the switching preparation.Source eNB obtains an optimal target eNB according to the measurement report message of receiving according to handoff algorithms, and sends handoff request message to the target eNB of choosing (as step 404 among Fig. 4), and notification target eNB carries out to switch and prepares.Finish after this step, the switching of the phase I of switching prepares just to have finished.
Step 604: judge whether target eNB is carried out switching and prepared.The switching response message (as step 405 among Fig. 4) that source eNB sends according to the target eNB of receiving judges whether whether target eNB is carried out switching and prepared, be fit to switch.If target eNB is got ready, then switching enters into step 605, and source eNB begins execution in step 605 simultaneously ", set up context (as step 408 among Fig. 4) synchronously with MRN subordinate UE; If target eNB is not ready, source eNB need resend and measure control messages to MRN, carries out handover measurement again, enters step 601.
Step 605 ": it is synchronous that MRN subordinate UE and source eNB set up context.In this step, if target eNB is ready, then use the fast context of ACTIVE tabulation carrying out MRN subordinate UE and source eNB synchronous, the RRC that sets up between UE and the source eNB connects.Be specially:
ENB can obtain the user profile of ACTIVE pattern by the mode of tabling look-up, and according to the information in the ACTIVE tabulation, subordinate UE quick and MRN is synchronous.
The initialization of ACTIVE tabulation is to carry out carrying out when RRC is connected at UE and MRN.When MRN and UE carry out RRC when being connected, MRN is the C-RNTI that distributes for each UE and corresponding " Frequencyinfo " write tabulation, MRN sub-district ID, MRN/eNB SFN and the MRN/eNB secure identifier in addition that write simultaneously.
The renewal of the forwarding state PDCP SN state of user data need be carried out when switching during forwarding, when proceeding to step 604, judge that whether target is carried out switching and prepared, if target eNB is got ready, then begins the C-RNTI that upgrades MRN PDCP SN state information and obtain source eNB.Can specifically adopt following method,
Switching response message according to target eNB judges whether to carry out the switching preparation, prepares if target eNB is carried out to switch; Judge whether current service cell is the MRN sub-district, if present node ID is MRN sub-district ID, then current service cell is the MRN sub-district; Carry out synchronously, upgrading present node ID is the sub-district ID of source eNB, synchronously after, present node becomes source eNB; Upgrade each user data under the ACTIVE pattern successively, upgrade the data forward state of each UE; Promptly upgrade MRN PDCP SN and the eNBC-RNTI of each UE, UE obtains the C-RNTI under the eNB of source.
After above-mentioned renewal process was finished, it is synchronous that source eNB just can carry out fast context according to the user profile in the table 1.
After finishing synchronously, the UE data begin directly to be transmitted by source eNB, i.e. step 606 ".So far UE finish with source eNB synchronously, but as seen from Figure 4, the not disconnection that is connected of MRN and UE, so direct-cut operation does not take place, the switching of MRN is not finished.
Step 605: source eNB sends and switches indication to MRN startup switching.Source eNB receives after the switching response message of target eNB, send switch indicating information to MRN, this message comprises that target eNB is the information of the switching needs of MRN preparation, for example QoS information and the X2/S1 interface message of MRN and the scheduling control information of resource etc. of the UE of the C-RNTI of the target eNB of UE, EPS carrying.
Step 606:MRN receives after the switch indicating information, disconnect with source eNB get in touch and beginning and target eNB are carried out synchronously.Here, the MRN disconnection is got in touch with source eNB's, and the UE data were no longer transmitted by MRN before the MRN switching is finished.The synchronizing process of MRN and target eNB can be used existing synchronizing process.
Step 607: target eNB judges whether receive switch acknowledgment message in the clock cycle.Target eNB judges according to whether receive switch acknowledgment message in the clock cycle whether mobile via node finishes the switching between the base station.MRN disconnect with being connected of source eNB after, system is provided with a timer, if in official hour, do not finish the synchronous of MRN and target eNB, it is target eNB was not received MRN before clock is overtime switch acknowledgment message, then think handoff failure, MRN connects (step 608) with source eNB again, returns step 601, carries out handover measurement again; If in the clock cycle, receive the switch acknowledgment message of MRN, then expression success synchronously, MRN finishes from source eNB to the switching the target eNB.
At this moment, finished second stage---the handover execution stage of switching.Enter and switch the stage of finishing, the renewal, the MRN that mainly carry out network side in this stage discharge with the synchronous and source eNB resource of subordinate UE.
Step 608: carry out network side and upgrade.Mainly be the routing update of carrying out packet, the packet that sends to MRN changing into through the target eNB route by the past through source eNB route;
Step 609:MRN judges whether to receive the ACTIVE list state.After MRN receives that the ACTIVE after the renewal tabulates, send and set up the context synchronization request message, enter into step 607 " and 608 ", begin to set up the synchronous of MRN and subordinate UE to subordinate UE (step 417).
Step 608 ": it is synchronous that MRN subordinate UE and MRN rebulid context: to set up context synchronous with MRN again for MRN subordinate UE.In this step, MRN has finished and has switched to target eNB, with source eNB decoupling, but that directly link to each other with the user is source eNB, the ACTIVE tabulation also is to be upgraded by source eNB, so the ACTIVE tabulation after source eNB needs by X2 interface renewal to be finished earlier passes to target eNB, MRN obtains ACTIVE tabulation (step 416) by target eNB again.Finish fast synchronously according to the UE information under the ACTIVE pattern.
Wherein the renewal process of source eNB his-and-hers watches 1 is: if MRN finishes switching, judge whether to receive the context request message of setting up of MRN; If present node ID is eNB sub-district, source ID, then current service cell is eNB sub-district, source, and upgrading present node ID is the sub-district ID of MRN, synchronously after, present node becomes MRN; Upgrade each user data under the ACTIVE pattern successively, upgrade the data forward state eNB PDCP SN of each UE.
Because MRN with respect to the user less than changing, so MRN C-RNTI that its C-RNTI still uses initialization procedure to obtain, therefore, do not need the C-RNTI that carries out MRN to upgrade, so far UE is linked to MRN again, user data is transmitted (step 609) by MRN, and the process that MRN subordinate UE is relevant is all over.
Step 610: notification source eNB discharges resource.MRN finishes switching, and the UE data are transmitted by target eNB-MRN-UE link, and source eNB can discharge all with the MRN resource relevant with its subordinate UE.Arrive here, whole mobile via node and subordinate thereof organize user's switching and have just finished.
Clearly in the present embodiment, use method of the present invention direct-cut operation does not take place, guaranteed the continuity of data forwarding, reduced the probability of packet loss and switching accidental interruption, thereby can provide higher service quality for the user.
According to provided by the invention group of user's changing method, solved the problem aspect the continuity that the group user runs into when data forwarding.Particularly, the present invention can be applied in the communication system scene of 3GPP LTE-A, and the present invention also can be used for other and moves relay system.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. group user's cell switching method in the wireless communication system is characterized in that, comprises the steps:
A. in base station and mobile via node, set up an activation/effectively ACTIVE tabulation, be used for preserving the synchronous needed user profile of fast context of source base station and user's synchronous and mobile via node MRN of fast context and subordinate user UE;
B. in handover execution stage, when mobile via node did not also have to disconnect with being connected of source base station eNB, the user profile during source base station is tabulated by ACTIVE was finished with mobile relaying subordinate user's context synchronous, and user data directly transmits by source base station;
C. mobile via node is finished the switching between source base station and target BS eNB, and described ACTIVE tabulation is updated when switching;
D. mobile via node is finished after the switching between source base station and the target BS, and mobile relaying finishes by the user profile in the ACTIVE tabulation that to rebulid context synchronous with the user.
2. method according to claim 1 is characterized in that, the forwarding state of the user data that the forwarding state of the user data of first user uplink that lose each user's of preservation current access point in the ACTIVE tabulation and last user are descending; System frame number SFN is comprised in the system message, and the user carries out the sub-district and reads from corresponding physical channel when synchronous.
3. method according to claim 1 is characterized in that step b further comprises, the user is under the connection of MRN for group, when the switching that switches to target eNB from source eNB was carried out, the resource of MRN subordinate UE was managed by MRN, and the information interaction between source eNB and the target eNB is transmitted by X2 interface.
4. method according to claim 1, it is characterized in that step b comprises that further source eNB is by looking into the user profile that the ACTIVE tabulation obtains the ACTIVE pattern, subordinate user quick and MRN is synchronous, and the radio resource control RRC that sets up between UE and the source eNB connects.
5. method according to claim 1 is characterized in that, step c further comprises, is switching the starting stage of taking place, and upgrades the ACTIVE tabulation by mobile via node; In handover execution stage, upgrade the ACTIVE tabulation by source eNB; Finish the stage in switching, source eNB is transmitted to target eNB to the ACTIVE tabulation of upgrading later, is transmitted to mobile via node again by target eNB.
6. method according to claim 1 is characterized in that, step c further comprises, carries out the renewal of the forwarding status information of user data when switching, and obtains the cell-radio network identifier of source eNB.
7. method according to claim 1, it is characterized in that steps d comprises that further the ACTIVE tabulation after renewal being finished by X2 interface by source eNB passes to target eNB, MRN obtains the ACTIVE tabulation by target eNB, finishes fast synchronously according to the UE information under the ACTIVE pattern.
8. method according to claim 5 is characterized in that, the step of described renewal ACTIVE tabulation comprises, if current service cell is the MRN sub-district, carry out source eNB and mobile relaying subordinate user's context synchronous after, present node becomes source eNB; Upgrade each user's data forwarding state under the ACTIVE pattern successively; The user obtains the cell-radio network identifier under the eNB of source.
9. according to claim 1 or 6 described methods, it is characterized in that source eNB to the renewal process of ACTIVE tabulation is:, and receive the context request message of setting up of MRN if MRN finishes switching; If present node ID is eNB sub-district, source ID, upgrading present node ID is the sub-district ID of MRN, synchronously after, present node becomes MRN; Upgrade each user's data forwarding state under the ACTIVE pattern successively.
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