CN104301883A

CN104301883A - Coordinated multiple-point transmission control method and device for use in cell handover process

Info

Publication number: CN104301883A
Application number: CN201310298378.XA
Authority: CN
Inventors: 付喆
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2013-07-16
Filing date: 2013-07-16
Publication date: 2015-01-21
Anticipated expiration: 2033-07-16
Also published as: WO2015007210A1; CN104301883B

Abstract

The invention discloses a coordinated multiple-point transmission control method and device for use in a cell handover process. The method comprises the following steps: after a service base station determines to perform cell handover on a terminal, judging whether a target base station supports coordinated multiple-point transmission of the terminal or not; if so, sending a handover notification message to other access network nodes in a coordination set, and otherwise, deactivating multiple-point transmission of the terminal and sending a message for instructing to deactivate the multiple-point transmission to the other access network nodes, wherein the handover notification message carries the identification information of the terminal, the identification information of the target base station and coordinated multiple-point transmission maintenance instruction information; if the other access network nodes receive the handover notification message, determining handover of the terminal o the target base station, and continuing the coordinated multiple-point transmission; and if the message for deactivating the coordinated multiple-point transmission is received, deactivating the coordinated multiple-point transmission of the terminal. Through adoption of the method and the device, the problem concerned with the coordinated multiple-point transmission of the terminal during cell handover of the terminal executing the coordinated multiple-point transmission is solved.

Description

Cooperative multipoint transmission control method in a kind of cell switch process and device

Technical field

The present invention relates to wireless communication technology field, particularly relate to the cooperative multipoint transmission control method in a kind of cell switch process and device.

Background technology

In Long Term Evolution (Long Term Evolution, LTE) system, the process that UE carries out cell merge is as follows:

The measurement result that source evolved base station (eNB) reports according to subscriber equipment (User Equipment, UE), makes as UE carries out the judgement of X2 switching.

Source eNB sends handover request message to target eNB.

Target eNB is after receiving this handover request message, and for UE configures new carrying, if configuration successful, target eNB returns switching response message to source eNB.

After source eNB receives switching response message, send wireless heterogeneous networks (RadioResourceControl, RRC) reconfiguration message to UE, and stop reception and the transmission of data surface and chain of command.

After UE receives RRC reconfiguration message, start to stop and the data surface of source eNB and the reception of chain of command and transmission, carry out synchronization operation with target eNB.Wherein, after completing down-going synchronous, UE initiates uncontested random access procedure, uplink synchronous is completed by uncontested random access procedure, UE sends RRC to target eNB and has reshuffled message, after target eNB receives this message, return confirmation (ACK) message of RLC, start the transmission carrying out downlink data simultaneously.And UE is receiving after after the ACK message of this RLC, starting the up transmission of data surface.

In addition, at network side, in order to ensure the lossless operation of AM data, the PDCP SDU that source eNB is not confirmed to target eNB forward or newly arrives.

Target eNB receives after RRC reshuffled message, and will notify core net transduction pathway, after receiving the confirmation from core net, notification source eNB is discharged old carrying by target eNB.

In order to reduce the adjacent area interference of MPS process edge UE, Long Term Evolution strengthens (Long Term Evolution-Advance, LTE-A) system and have employed cooperative multipoint transmission technology (Coordinated-Multiple-Point, CoMP).Cooperative multipoint transmission technology refers to, the collaborative participation of multiple transfer points (Transmission Point, TP) that geographical position is separated is that a UE carries out transfer of data or combines the data of an acceptance UE transmission.In general, multiple transfer point can be the base station of different districts, also can be that the radio-frequency maser (Remote Radio Head, RRH) of different districts is descended with it in same base station.

Carry out global optimization scheduling whether there is Centroid, the implementation of CoMP technology is divided into non-central cooperative scheduling and center cooperative scheduling two kinds.Under the cooperative scheduling scene of center, dispatched the transmission of CoMP UE by center cooperative node (Central Coordination Node, CCN) and service base station collaboration.Under non-central scheduling scenario, between multiple cooperative base station, carry out repeatedly the mutual of schedule information, dispatch the transmission of CoMP UE in the mode of iteration scheduling.Wherein, CoMP UE refers to the UE supporting cooperative multipoint transmission.

When prior art carries out cell merge to UE, based on prerequisite be by serving BS, scheduling of resource is carried out to UE separately, do not have to consider to perform the CoMP UE of cooperative multipoint transmission carry out cell merge time, to the problem how cooperative multipoint transmission of CoMP UE processes.

Summary of the invention

The object of this invention is to provide the cooperative multipoint transmission control method in a kind of cell switch process and device, when carrying out cell merge with the CoMP UE solving execution cooperative multipoint transmission, to the problem how cooperative multipoint transmission of CoMP UE processes.

The object of the invention is to be achieved through the following technical solutions:

Embodiments provide the cooperative multipoint transmission control method in cell switch process.Wherein, cell switch process comprises: serving BS is after determining to carry out cell merge to terminal, handover request message is sent to target BS, and after the handover request ack message receiving the transmission of this target BS, switching command is sent, to indicate this terminal switch to the community of above-mentioned target BS to above-mentioned terminal.Wherein, this terminal is the terminal performing cooperative multipoint transmission.

In above-mentioned cell switch process, a kind of cooperative multipoint transmission control method comprises:

This serving BS, after determining to carry out cell merge to above-mentioned terminal, judges whether above-mentioned target BS supports the cooperative multipoint transmission to this terminal;

If this target BS supports the cooperative multipoint transmission to this terminal, serving BS to participate in this terminal cooperative multipoint transmission cooperation set in other access network nodes send handoff notification message, carry the identification information of above-mentioned terminal, the identification information of above-mentioned target BS and cooperative multipoint transmission in this handoff notification message and maintain indication information;

If this target BS does not support the cooperative multipoint transmission to this terminal, serving BS deexcitation is to the cooperative multipoint transmission of this terminal, and the message of instruction deexcitation cooperative multipoint transmission is sent to other access network nodes in the cooperation set of the cooperative multipoint transmission of this terminal of participation, carry the identification information of described terminal and the indication information of deexcitation cooperative multipoint transmission in the message of this instruction deexcitation multicast communication.

The method that the embodiment of the present invention provides, carrying out in cell switch process to terminal, if determine the cooperative multipoint transmission of target BS support to terminal, maintain the cooperative multipoint transmission of this terminal, if determine that target BS does not support the cooperative multipoint transmission to this terminal, the cooperative multipoint transmission of this terminal of deexcitation, the cooperative multipoint transmission of other access network node deexcitations in gathering for this terminal and instruction cooperates, do not need the continuity of the cooperative multipoint transmission ensureing terminal, solve and perform the CoMP UE of cooperative multipoint transmission when carrying out cell merge, to the problem how cooperative multipoint transmission of CoMP UE processes.

In the embodiment of the present invention, serving BS can judge whether target BS supports the cooperative multipoint transmission to above-mentioned terminal by obtaining information in several ways, enumerates wherein several implementation below:

Whether mode one, serving BS support the indication information of the cooperative multipoint transmission to above-mentioned terminal according to the target BS carried in above-mentioned handover request ack message, judge whether this target BS supports the cooperative multipoint transmission to this terminal.

Under this mode, optionally, serving BS can carry CoMP transmission capability requests information in the handover request message sending to target BS, and this CoMP transmission capability requests information is used to indicate target BS and sends the indication information whether it supports the cooperative multipoint transmission to above-mentioned terminal.Further, serving BS can also carry the indication information whether serving BS supports the cooperative multipoint transmission to above-mentioned terminal in handover request message.

Whether mode two, serving BS support the indication information of the cooperative multipoint transmission to above-mentioned terminal according to each base station that OAM sends in advance, judge whether this target BS supports the cooperative multipoint transmission to above-mentioned terminal.

Mode three, serving BS, according to the indication information whether supporting the cooperative multipoint transmission to above-mentioned terminal mutual in advance between base station, judge whether target BS supports the cooperative multipoint transmission to above-mentioned terminal.

Whether mode four, serving BS support the indication information of the cooperative multipoint transmission to above-mentioned terminal according to each base station that the center cooperation point in above-mentioned cooperation set sends in advance, judge whether target BS supports the cooperative multipoint transmission to above-mentioned terminal.

Obviously, the prerequisite of employing mode four is, above-mentioned cooperation set comprises center cooperation point.

Based on above-mentioned any implementation, preferably, serving BS judge target BS whether support to the specific implementation means of the cooperative multipoint transmission of terminal can but be not limited only to comprise:

If whether target BS is supported to indicate described target BS not support cooperative multipoint transmission to the indication information of the cooperative multipoint transmission of above-mentioned terminal, serving BS judges that this target BS does not support the cooperative multipoint transmission to above-mentioned terminal;

If whether target BS supports the cooperative multipoint transmission indication information of the cooperative multipoint transmission of above-mentioned terminal being indicated to this target BS not Support center scheduling method, but scheduling method centered by the cooperative multipoint transmission of this terminal, serving BS judges that this target BS does not support the cooperative multipoint transmission to above-mentioned terminal;

If whether target BS supports the cooperative multipoint transmission indication information of the cooperative multipoint transmission of above-mentioned terminal being indicated to this target BS Support center scheduling method, and scheduling method centered by the cooperative multipoint transmission of this terminal, serving BS judges that this target BS supports the cooperative multipoint transmission to above-mentioned terminal; If whether this target BS supports the cooperative multipoint transmission of the indication information indicating target base station Support center scheduling method of the cooperative multipoint transmission to described terminal, then whether target BS supports the identification information of the center cooperation point indication information of the cooperative multipoint transmission of described terminal also being indicated to the cooperation set of this target BS place.

Based on above-mentioned any implementation, preferably, serving BS after determining that cell merge is carried out to above-mentioned terminal, before judging the cooperative multipoint transmission whether target BS is supported above-mentioned terminal.If determine that cell merge is that S1 switches, then deexcitation is to the cooperative multipoint transmission of above-mentioned terminal, and the message of instruction deexcitation cooperative multipoint transmission is sent to other access network nodes in the cooperation set of the cooperative multipoint transmission of this terminal of participation, carry the identification information of above-mentioned terminal and the indication information of deexcitation cooperative multipoint transmission in the message of this instruction deexcitation multicast communication.

At serving BS and target BS not when same Mobility Management Entity (MME), cannot X2 switching be carried out, and need to carry out S1 switching.S1 switches comparatively complicated, if still maintain the cooperative node transmission of terminal, also needs corresponding information to send to core net node.For simplifying switching flow, can when determining to be S1 switching, deexcitation is to the cooperative multipoint transmission of terminal.

In the embodiment of the present invention, participate in may comprising center cooperation point in the cooperation set of the cooperative multipoint transmission of above-mentioned terminal, also may comprise other cooperative base station outside serving BS.

Based on above-mentioned any serving BS side embodiment of the method, for the situation of target BS support to the cooperative multipoint transmission of terminal.Preferably, if whether above-mentioned target BS supports the identification information indication information of the cooperative multipoint transmission of above-mentioned terminal being indicated to the cooperative multipoint transmission of this target BS Support center scheduling method and the center cooperation point of this target BS place cooperation set, and scheduling method centered by the cooperative multipoint transmission of this terminal, then serving BS sends handoff notification message to other access network nodes in the cooperation set of the cooperative multipoint transmission of this terminal of participation, specifically refer to: serving BS sends handoff notification message to the center cooperation point in the cooperation set of the cooperative multipoint transmission of the above-mentioned terminal of participation, the identification information of the center cooperation point of target BS place cooperation set is also carried in this handoff notification message.

On this basis, preferably, before described serving BS sends handoff notification message to the center cooperation point in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, according to the identification information of the center cooperation point of described target BS place cooperation set, judge whether described target BS and described serving BS belong to same center cooperation point;

If do not belonged to, described serving BS sends described handoff notification message to described target BS, so that the center cooperation point that described handoff notification message sends to described target BS place to cooperate in set by described target BS;

If belonged to, described serving BS sends handoff notification message to the center cooperation point in the cooperation set of the cooperative multipoint transmission of the described terminal of participation.

Based on above-mentioned any serving BS side embodiment of the method, target BS is not supported to the situation of the cooperative multipoint transmission to terminal.In a kind of situation, if the cooperation set participating in the cooperative multipoint transmission of above-mentioned terminal comprises center cooperation point, preferably, send the message of instruction deexcitation cooperative multipoint transmission to other access network nodes in the cooperation set of the cooperative multipoint transmission of the above-mentioned terminal of participation, comprising: the message sending instruction deexcitation cooperative multipoint transmission to this center cooperation point; Send the message of instruction deexcitation cooperative multipoint transmission to this center cooperation point after, serving BS can also receive this terminal that this center cooperation point sends identification information, not to this terminal transmission or the end position information not receiving the data of correct confirmation of this terminal, the start position information of these data and these data, and the identification information of this terminal, these data, the start position information of these data and the end position information of these data are preserved in association.

On the basis of this situation, if participate in other cooperative base station also comprised in the cooperation set of the cooperative multipoint transmission of above-mentioned terminal outside serving BS, preferably, send the message of instruction deexcitation cooperative multipoint transmission to other access network nodes in the cooperation set of the cooperative multipoint transmission of the above-mentioned terminal of participation, also comprise: other cooperative base station in closing to above-mentioned collaboration set send the message indicating deexcitation cooperative multipoint transmission.

Notify the cooperative multipoint transmission of the above-mentioned terminal of other cooperative base station deexcitations, thus the coordinated multipoint transmission avoiding other cooperative base station to continue as above-mentioned terminal carries out dispatching/transmitting, interference is caused to cell switch process or the communication after switching.

Based on above-mentioned any serving BS side embodiment of the method, target BS is not supported to the situation of the cooperative multipoint transmission to terminal.In another kind of situation, if the cooperation set participating in the cooperative multipoint transmission of above-mentioned terminal comprises other cooperative base station outside serving BS, but do not comprise center cooperation point, send the message of instruction deexcitation cooperative multipoint transmission to other access network nodes in the cooperation set of the cooperative multipoint transmission of the above-mentioned terminal of participation, comprising: other cooperative base station in closing to above-mentioned collaboration set send the message indicating deexcitation cooperative multipoint transmission; Send the message of instruction deexcitation cooperative multipoint transmission to other cooperative base station in this cooperation set after, serving BS can also receive this terminal that other cooperative base station send identification information, not to described terminal transmission or the end position information not receiving the data of correct confirmation of described terminal, the start position information of these data and these data, and the identification information of this terminal, these data, the start position information of these data and the end position information of these data are preserved in association.

In above-mentioned cell switch process, the cooperative multipoint transmission control method of a kind of access network node (this access network node refers to the access network node outside the serving BS of terminal in the cooperation set of the cooperative multipoint transmission participating in above-mentioned terminal) side comprises:

Access network node in the cooperation set of the cooperative multipoint transmission of participation terminal outside above-mentioned Terminal Service base station receives the message of instruction deexcitation cooperative multipoint transmission, carries the identification information of described terminal and the indication information of deexcitation cooperative multipoint transmission in the message of this instruction deexcitation multicast communication; Access network node determines this terminal according to the identification information of this terminal, and the instruction of indication information according to this deexcitation cooperative multipoint transmission, the cooperative multipoint transmission of this terminal of deexcitation; Or,

Above-mentioned access network node receives handoff notification message, carries the identification information of above-mentioned terminal, the identification information of above-mentioned target BS and cooperative multipoint transmission and maintain indication information in this handoff notification message; This access network node determines this terminal according to the identification information of this terminal, this target BS is determined according to the identification information of this target BS, and maintain indication information according to this cooperative multipoint transmission, determine that this terminal switch proceeds cooperative multipoint transmission to this target BS.

The method that the embodiment of the present invention provides, carrying out in cell switch process to terminal, if receive the Indication message of instruction deexcitation cooperative multipoint transmission, other access network nodes in cooperation set, according to the cooperative multipoint transmission of the instruction deexcitation of serving BS for this terminal, do not need the continuity of the cooperative multipoint transmission ensureing terminal.If receive handoff notification message, this access network node determines the cooperative multipoint transmission maintaining terminal.Solve and perform the CoMP UE of CoMP transmission when carrying out cell merge, to the problem how cooperative multipoint transmission of CoMP UE processes.

Wherein, access network node both can be the center cooperation point in above-mentioned cooperation set, also can be other cooperative base station in above-mentioned cooperation set outside serving BS.

If above-mentioned access network node is center cooperation point, preferably, the identification information of the center cooperation point of target BS place cooperation set is also carried in above-mentioned handoff notification message.

Based on above-mentioned any Access Network side embodiment, preferably, after proceeding cooperative multipoint transmission after determining described terminal switch to described target BS, the method also comprises:

Suspend the scheduling controlling to the cooperative multipoint transmission of above-mentioned terminal;

According to the identification information of the center cooperation point of above-mentioned target BS place cooperation set, judge center cooperation point whether this center cooperation point of this target BS place cooperation set;

If cooperation point Shi Zhe center, the center cooperation point of described target BS place cooperation set, after confirming above-mentioned terminal switch to this target BS, does not initiate path handoff procedure to core net node, continues the scheduling controlling of this terminal being carried out to cooperative multipoint transmission.

Due to after cooperation point Shi Zhe center, the center cooperation point of cooperation set determining target BS place, do not need to initiate path handoff procedure to core net node, thus reduce the impact of handoff procedure on core net, avoid unnecessary network function reconstitution process and loss.

Based on above-mentioned any access network node side embodiment of the method, preferably, if this access network node is center cooperation point, after the message of the instruction deexcitation cooperative multipoint transmission that the serving BS of this access network node receiving terminal sends, also by the identification information of this terminal, the serving BS not sending to this terminal to this terminal transmission or the end position information that do not receive the data of correct confirmation of this terminal, the start position information of these data and these data; If this access network node is other cooperative base station, after the message of the instruction deexcitation cooperative multipoint transmission that the serving BS of this access network node receiving terminal sends, also by the identification information of this terminal and the serving BS not sending to terminal to this terminal transmission or the data of correct confirmation that do not receive this terminal; Or other cooperative base station described are by the identification information of described terminal, the serving BS not sending to described terminal to described terminal transmission or the end position information that do not receive the data of correct confirmation of described terminal, the start position information of described data and described data.

Based on above-mentioned any access network node side embodiment of the method, if this access network node is center cooperation point, preferably, after the message of the instruction deexcitation cooperative multipoint transmission of the serving BS transmission of center cooperation point receiving terminal, also send the message of instruction deexcitation cooperative multipoint transmission to other cooperative base station outside serving BS in the cooperation set of the cooperative multipoint transmission of participation terminal, send in the message of the instruction deexcitation cooperative multipoint transmission of other cooperative base station and carry the identification information of this terminal and the indication information of deexcitation cooperative multipoint transmission.

Embodiments provide a kind of base station, this base station comprises:

Cell switch determining module, carries out cell merge for determining to terminal;

Messaging interface, after determining to carry out cell merge to described terminal in described cell switch determining module, sends handover request message to target BS; After receiving the handover request ack message of described target BS transmission, send switching command to described terminal, to indicate described terminal switch to the community of described target BS, described terminal is the terminal performing cooperative multipoint transmission;

Cooperative multipoint transmission control module, after determining to carry out cell merge to described terminal in described cell switch determining module, judges whether described target BS supports the cooperative multipoint transmission to described terminal; If described target BS support is to the cooperative multipoint transmission of described terminal, to participate in described terminal cooperative multipoint transmission cooperation set in other access network nodes send handoff notification message, carry the identification information of described terminal, the identification information of described target BS and cooperative multipoint transmission in described handoff notification message and maintain indication information; If described target BS does not support the cooperative multipoint transmission to described terminal, deexcitation is to the cooperative multipoint transmission of described terminal, and the message of instruction deexcitation cooperative multipoint transmission is sent to other access network nodes in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, carry the identification information of described terminal and the indication information of deexcitation cooperative multipoint transmission in the message of described instruction deexcitation multicast communication.

The base station that the embodiment of the present invention provides, carrying out in cell switch process to terminal, if determine the cooperative multipoint transmission of target BS support to terminal, maintain the cooperative multipoint transmission of this terminal, if determine that target BS does not support the cooperative multipoint transmission to this terminal, the cooperative multipoint transmission of this terminal of deexcitation, the cooperative multipoint transmission of other access network node deexcitations in gathering for this terminal and instruction cooperates, do not need the continuity of the cooperative multipoint transmission ensureing terminal, solve and perform the CoMP UE of cooperative multipoint transmission when carrying out cell merge, to the problem how cooperative multipoint transmission of CoMP UE processes.

Preferably, when judging the cooperative multipoint transmission whether described target BS support described terminal, described cooperative multipoint transmission control module specifically for:

Whether support the indication information of the cooperative multipoint transmission to described terminal according to the described target BS carried in described handover request ack message, judge whether described target BS supports the cooperative multipoint transmission to described terminal; Or,

Whether each base station sent in advance according to OAM supports the indication information of the cooperative multipoint transmission to described terminal, judges whether described target BS supports the cooperative multipoint transmission to described terminal; Or,

According to the indication information whether supporting the cooperative multipoint transmission to described terminal mutual in advance between base station, judge whether described target BS supports the cooperative multipoint transmission to described terminal; Or,

Whether each base station that the center cooperation point in gathering according to described cooperation sends in advance supports the indication information of the cooperative multipoint transmission to described terminal, judges whether described target BS supports the cooperative multipoint transmission to described terminal.

On above-mentioned preferably embodiment basis, further, when judging the cooperative multipoint transmission whether described target BS support described terminal, described cooperative multipoint transmission control module specifically may be used for:

If whether described target BS is supported to indicate described target BS not support cooperative multipoint transmission to the indication information of the cooperative multipoint transmission of described terminal, judge that described target BS does not support the cooperative multipoint transmission to described terminal;

If whether described target BS supports the cooperative multipoint transmission indication information of the cooperative multipoint transmission of described terminal being indicated to described target BS not Support center scheduling method, but scheduling method centered by the cooperative multipoint transmission of described terminal, judges that described target BS does not support the cooperative multipoint transmission to described terminal;

If whether described target BS supports the cooperative multipoint transmission indication information of the cooperative multipoint transmission of described terminal being indicated to described target BS Support center scheduling method, and scheduling method centered by the cooperative multipoint transmission of described terminal, judge that described target BS support is to the cooperative multipoint transmission of described terminal; If whether described target BS supports the cooperative multipoint transmission indication information of the cooperative multipoint transmission of described terminal being indicated to described target BS Support center scheduling method, whether described target BS supports the identification information of the center cooperation point indication information of the cooperative multipoint transmission of described terminal also being indicated to the cooperation set of described target BS place.

Based on above-mentioned any base station embodiment, preferably, after described cell switch determining module determines to carry out cell merge to described terminal, before described cooperative multipoint transmission control module judges the cooperative multipoint transmission whether described target BS is supported described terminal, described cooperative multipoint transmission control module also for:

If determine that described cell merge is that S1 switches, deexcitation is to the cooperative multipoint transmission of described terminal, and the message of instruction deexcitation cooperative multipoint transmission is sent to other access network nodes in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, carry the identification information of described terminal and the indication information of deexcitation cooperative multipoint transmission in the message of described instruction deexcitation multicast communication.

Based on above-mentioned any base station embodiment, preferably, if whether described target BS supports the identification information indication information of the cooperative multipoint transmission of described terminal being indicated to the cooperative multipoint transmission of described target BS Support center scheduling method and the center cooperation point of described target BS place cooperation set, and scheduling method centered by the cooperative multipoint transmission of described terminal, when described cooperative multipoint transmission control module sends handoff notification message to other access network nodes in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, specifically for:

Send handoff notification message to the center cooperation point in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, in described handoff notification message, also carry the identification information of the center cooperation point of described target BS place cooperation set.

On this basis, preferably, to participate in described terminal cooperative multipoint transmission cooperation set in center cooperation point send handoff notification message time, described cooperative multipoint transmission control module specifically for:

According to the identification information of the center cooperation point of described target BS place cooperation set, judge whether described target BS and described serving BS belong to same center cooperation point;

If do not belonged to, send described handoff notification message to described target BS, so that the center cooperation point that described handoff notification message sends to described target BS place to cooperate in set by described target BS;

If belonged to, send handoff notification message to the center cooperation point in the cooperation set of the cooperative multipoint transmission of the described terminal of participation.

Based on above-mentioned any base station embodiment, preferably, if the cooperation set participating in the cooperative multipoint transmission of described terminal comprises center cooperation point, when described cooperative multipoint transmission control module sends the message of instruction deexcitation cooperative multipoint transmission to other access network nodes in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, specifically for:

The message of instruction deexcitation cooperative multipoint transmission is sent to described center cooperation point;

Send the message of instruction deexcitation cooperative multipoint transmission to described center cooperation point after, described cooperative multipoint transmission control module also for the identification information of: the described terminal that described center cooperation point sends, not to described terminal transmission or the end position information not receiving the data of correct confirmation of described terminal, the start position information of described data and described data; The identification information of described terminal, described data, the start position information of described data and the end position information of described data are preserved in association.

On this basis, preferably, if participate in other cooperative base station also comprised in the cooperation set of the cooperative multipoint transmission of described terminal outside described base station, described cooperative multipoint transmission control module to participate in described terminal cooperative multipoint transmission cooperation set in other access network nodes send the message of instruction deexcitation cooperative multipoint transmission time, also for:

The message of instruction deexcitation cooperative multipoint transmission is sent to other cooperative base station in described cooperation set.

Based on above-mentioned any base station embodiment, preferably, if the cooperation set participating in the cooperative multipoint transmission of described terminal comprises other cooperative base station outside described base station, but do not comprise center cooperation point, when described cooperative multipoint transmission sends the message of instruction deexcitation cooperative multipoint transmission to other access network nodes in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, specifically for:

The message of instruction deexcitation cooperative multipoint transmission is sent to other cooperative base station in described cooperation set;

After sending the message of instruction deexcitation cooperative multipoint transmission to other cooperative base station in described cooperation set, described cooperative multipoint transmission control module also for: receive the identification information of the described terminal that other cooperative base station described send, not to described terminal transmission or the end position information not receiving the data of correct confirmation of described terminal, the start position information of described data and described data; The identification information of described terminal, described data, the start position information of described data and the end position information of described data are preserved in association.

Embodiments provide a kind of access network node, described access network node be the cooperative multipoint transmission of participation terminal cooperation set described in access network node outside Terminal Service base station, this access network node comprises:

Cooperative multipoint transmission instruction receiver module, for receiving the message of instruction deexcitation cooperative multipoint transmission, carries the identification information of described terminal and the indication information of deexcitation cooperative multipoint transmission in the message of described instruction deexcitation multicast communication; Or for receiving handoff notification message, carrying the identification information of described terminal, the identification information of described target BS and cooperative multipoint transmission in described handoff notification message and maintaining indication information;

Cooperative multipoint transmission deexcitation module, when described cooperative multipoint transmission instruction receiver module receives the message of instruction deexcitation cooperative multipoint transmission, described cooperative multipoint transmission deexcitation module is used for determining described terminal according to the identification information of described terminal, and the instruction of indication information according to described deexcitation cooperative multipoint transmission, the cooperative multipoint transmission of terminal described in deexcitation;

Cooperative multipoint transmission maintains module, when described cooperative multipoint transmission instruction receiver module receives handoff notification message, described cooperative multipoint transmission maintains module and is used for determining described terminal according to the identification information of described terminal, described target BS is determined according to the identification information of described target BS, and maintain indication information according to described cooperative multipoint transmission, proceed cooperative multipoint transmission after determining described terminal switch to described target BS.

The access network node that the embodiment of the present invention provides, carrying out in cell switch process to terminal, if receive the Indication message of instruction deexcitation cooperative multipoint transmission, other access network nodes in cooperation set, according to the cooperative multipoint transmission of the instruction deexcitation of serving BS for this terminal, do not need the continuity of the cooperative multipoint transmission ensureing terminal.If receive handoff notification message, this access network node determines the cooperative multipoint transmission maintaining terminal.Solve and perform the CoMP UE of CoMP transmission when carrying out cell merge, to the problem how cooperative multipoint transmission of CoMP UE processes.

Preferably, if described access network node is center cooperation point, in described handoff notification message, also carry the identification information of the center cooperation point of described target BS place cooperation set.

Based on above-mentioned any access network node embodiment, preferably, after described cooperative multipoint transmission maintains and proceeds cooperative multipoint transmission after module determines described terminal switch to described target BS, also for:

Suspend the scheduling controlling to the cooperative multipoint transmission of described terminal;

According to the identification information of the center cooperation point of described target BS place cooperation set, judge center cooperation point whether this center cooperation point of described target BS place cooperation set;

If cooperation point Shi Zhe center, the center cooperation point of described target BS place cooperation set, after confirming described terminal switch to described target BS, do not initiate path handoff procedure to core net node, continue the scheduling controlling of described terminal being carried out to cooperative multipoint transmission.

If described access network node is center cooperation point, preferably, also comprise the first data transmission blocks;

After the message of the instruction deexcitation cooperative multipoint transmission that the serving BS of described cooperative multipoint transmission instruction receiver module receiving terminal sends, described first data transmission blocks is used for the identification information of described terminal, the serving BS not sending to described terminal to described terminal transmission or the end position information that do not receive the data of correct confirmation of described terminal, the start position information of described data and described data;

If described access network node is other cooperative base station outside serving BS, preferably, also comprise the second data transmission blocks;

After described cooperative multipoint transmission instruction receiver module is sent to the message of instruction deexcitation cooperative multipoint transmission, described second data transmission blocks is used for the identification information of described terminal and the serving BS not sending to described terminal to described terminal transmission or the data of correct confirmation that do not receive this terminal; Or, after described cooperative multipoint transmission instruction receiver module is sent to the message of instruction deexcitation cooperative multipoint transmission, described second data transmission blocks is used for the identification information of described terminal, the serving BS not sending to described terminal to described terminal transmission or the end position information that do not receive the data of correct confirmation of described terminal, the start position information of described data and described data.

On this basis, preferably, if described access network node is center cooperation point, cooperative multipoint transmission instruction sending module is also comprised;

After the message of the instruction deexcitation cooperative multipoint transmission of the serving BS transmission of described cooperative multipoint transmission instruction receiver module receiving terminal, described cooperative multipoint transmission instruction sending module is used for the message sending instruction deexcitation cooperative multipoint transmission to other cooperative base station outside serving BS in the cooperation set of the cooperative multipoint transmission of participation terminal, sends in the message of the described instruction deexcitation cooperative multipoint transmission of other cooperative base station described and carries the identification information of described terminal and the indication information of deexcitation cooperative multipoint transmission.

Embodiments provide the cooperative multipoint transmission control device in a kind of handoff procedure, comprising:

Processor, this processor is configured to the cooperative multipoint transmission control that this processor is configured to perform in cell switch process and cell switch process;

When this processor is configured to perform cell switch process, specifically: after determining that cell merge is carried out to terminal, handover request message is sent to target BS, and after the handover request ack message receiving the transmission of this target BS, switching command is sent, to indicate this terminal switch to the community of above-mentioned target BS to above-mentioned terminal.Wherein, this terminal is the terminal performing cooperative multipoint transmission.

When this processor is configured to the cooperative multipoint transmission control performed in cell switch process, specifically: after determining that cell merge is carried out to described terminal, judge whether described target BS supports the cooperative multipoint transmission to described terminal; If described target BS support is to the cooperative multipoint transmission of described terminal, to participate in described terminal cooperative multipoint transmission cooperation set in other access network nodes send handoff notification message, carry the identification information of described terminal, the identification information of described target BS and cooperative multipoint transmission in described handoff notification message and maintain indication information; If described target BS does not support the cooperative multipoint transmission to described terminal, deexcitation is to the cooperative multipoint transmission of described terminal, and the message of instruction deexcitation cooperative multipoint transmission is sent to other access network nodes in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, carry the identification information of described terminal and the indication information of deexcitation cooperative multipoint transmission in the message of described instruction deexcitation multicast communication.

Embodiments provide the cooperative multipoint transmission control device in another kind of handoff procedure, comprising:

Processor, this processor is configured to the message receiving instruction deexcitation cooperative multipoint transmission, carries the identification information of described terminal and the indication information of deexcitation cooperative multipoint transmission in the message of described instruction deexcitation multicast communication; Described access network node determines described terminal according to the identification information of described terminal, and the instruction of indication information according to described deexcitation cooperative multipoint transmission, the cooperative multipoint transmission of terminal described in deexcitation; Or, receive handoff notification message, carry the identification information of described terminal, the identification information of described target BS and cooperative multipoint transmission in described handoff notification message and maintain indication information; Described access network node determines described terminal according to the identification information of described terminal, described target BS is determined according to the identification information of described target BS, and maintain indication information according to described cooperative multipoint transmission, proceed cooperative multipoint transmission after determining described terminal switch to described target BS.

The device that the embodiment of the present invention provides, carrying out in cell switch process to terminal, if determine the cooperative multipoint transmission of target BS support to terminal, maintain the cooperative multipoint transmission of this terminal, if determine that target BS does not support the cooperative multipoint transmission to this terminal, the cooperative multipoint transmission of this terminal of deexcitation, do not need the continuity of the cooperative multipoint transmission ensureing terminal, solve and perform the CoMP UE of cooperative multipoint transmission when carrying out cell merge, to the problem how cooperative multipoint transmission of CoMP UE processes.

Accompanying drawing explanation

First method schematic diagram that Fig. 1 provides for the embodiment of the present invention;

Second method schematic diagram that Fig. 2 provides for the embodiment of the present invention;

The 3rd the method schematic diagram that Fig. 3 provides for the embodiment of the present invention;

The 4th the method schematic diagram that Fig. 4 provides for the embodiment of the present invention;

The 5th the method schematic diagram that Fig. 5 provides for the embodiment of the present invention;

The base station schematic diagram that Fig. 6 provides for the embodiment of the present invention;

The access network node schematic diagram that Fig. 7 provides for the embodiment of the present invention.

Embodiment

The core concept of the embodiment of the present invention is: in cell switch process, if determine the cooperative multipoint transmission of target BS support to terminal, maintain the cooperative multipoint transmission of this terminal, if determine that target BS does not support the cooperative multipoint transmission to this terminal, the cooperative multipoint transmission of this terminal of deexcitation, and other access network node deexcitations in instruction cooperation set are for the cooperative multipoint transmission of this terminal, do not need the continuity of the cooperative multipoint transmission ensureing terminal.

The embodiment of the present invention is not only applicable to LTE, LTE-A network, is applicable to the communication network that other exist CoMP transmission too.

Before by reference to the accompanying drawings the embodiment of the present invention being described in detail, first the technical term related in the embodiment of the present invention is explained.

CoMP UE, refers to the UE supporting CoMP transmission.Due to the technical problem to be solved in the present invention be perform the CoMP UE of cooperative multipoint transmission carry out cell merge time, to the problem how cooperative multipoint transmission of CoMP UE processes.Therefore, the terminal related in the embodiment of the present invention, if no special instructions, all refers to the CoMP UE performing CoMP transmission.

Base station can be the eNB in LTE system, also can refer to the access network node possessing base station functions in follow-up evolution version.

Serving BS, refers to the base station belonging to the community that terminal accesses.

Cooperation set, refers to the set that the access network node providing CoMP transmission to serve for terminal is formed.

A CCN can be comprised in this cooperation set and comprise at least one cooperative base station of serving BS of terminal.

CCN, can be served as by a cooperative base station in cooperation set; Also can be the independent logical functional entity possessing comparatively degree of emphasizing/data-handling capacity, can perform CoMP transmission scheduling, this independent logical functional entity be deployed in a cooperative base station inside in cooperation set, or is deployed in one independently in network entity.

CCN can be that OAM is pre-configured, also can be (as each cooperative base station in certain area is selected to provide the wide base station covered) that each cooperative base station in certain area is determined from main separation.Interface between CCN with each cooperative base station in gathering that cooperates can continue to use existing X2 interface, also can define new interface, can set up interface connect when CCN activates.

Below in conjunction with accompanying drawing, the technical scheme that the embodiment of the present invention provides is described in detail.

Cooperative multipoint transmission control method in this cell switch process that cell switch process and the embodiment of the present invention provide as shown in Figure 1, specifically comprises following operation:

Step 100, serving BS are determined to carry out cell merge to terminal.

Step 110, serving BS send handover request message to target BS.

Step 120, serving BS receive the handover request ack message that this target BS sends.

Step 130, serving BS send switching command to this terminal, to indicate described terminal switch to the community of described target BS.

Serving BS, after determining to carry out cell merge to described terminal, also performs step 140, judges whether above-mentioned target BS supports the cooperative multipoint transmission to this terminal.

If supported, perform step 150, otherwise, perform step 160.

Step 150, serving BS send handoff notification message to other access network nodes in the cooperation set of the cooperative multipoint transmission of the above-mentioned terminal of participation, carry the identification information of this terminal, the identification information of this target BS and cooperative multipoint transmission and maintain indication information in this handoff notification message.

Step 160, serving BS deexcitation are to the cooperative multipoint transmission of this terminal, and the message of instruction deexcitation cooperative multipoint transmission is sent to other access network nodes in the cooperation set of the cooperative multipoint transmission of this terminal of participation, carry the identification information of this terminal and the indication information of deexcitation cooperative multipoint transmission in the message of this instruction deexcitation multicast communication.

Wherein, serving BS deexcitation, to the cooperative multipoint transmission of this terminal, refers to no longer according to dispatch this terminal with the information interaction of other access network nodes in gathering that cooperate and/or transmit.Which operation it specifically comprises, and depending on the CoMP transmission pattern of this UE, the CoMP ability of serving BS etc., the embodiment of the present invention does not do concrete restriction.

In handling process shown in Fig. 1, serving BS is carrying out in cell switch process to terminal, if determine the cooperative multipoint transmission of target BS support to terminal, maintain the cooperative multipoint transmission of this terminal, if determine that target BS does not support the cooperative multipoint transmission to this terminal, the cooperative multipoint transmission of this terminal of deexcitation, the cooperative multipoint transmission of other access network node deexcitations in gathering for this terminal and instruction cooperates, do not need the continuity of the cooperative multipoint transmission ensureing terminal, solve and perform the CoMP UE of cooperative multipoint transmission when carrying out cell merge, to the problem how cooperative multipoint transmission of CoMP UE processes.In addition, as can be seen from Figure 1, the CoMP transmission control method that provides of the embodiment of the present invention, do not change original cell merge flow process, and can with original cell merge flow process executed in parallel, its implementation is simple, and can not cause the time delay of cell merge.

Serving BS can have various ways obtaining information whether to support the judgement of the cooperative multipoint transmission to above-mentioned terminal with realize target base station.The present invention is only exemplified below:

Implementation one:

Whether serving BS supports the indication information of the cooperative multipoint transmission to above-mentioned terminal according to the target BS carried in above-mentioned handover request ack message, judges whether this target BS supports the cooperative multipoint transmission to this terminal.

Wherein, if target BS does not support cooperative multipoint transmission, so, this indication information carried in the handover request ack message that target BS sends, can be the information that target BS does not support cooperative multipoint transmission, so serving BS is according to this indication information, judges that target BS does not support the cooperative multipoint transmission to this terminal.

If target BS supports cooperative multipoint transmission, so, this indication information carried in the switching request response that target BS sends can be the information of the base station information supporting cooperative multipoint transmission and the cooperative multipoint transmission pattern supported.Further, if the cooperative multipoint transmission of target BS Support center scheduling method, so this indication information can be the identification information (optionally also comprising the information that the cooperative multipoint transmission pattern that the information of cooperative multipoint transmission and target BS are supported is supported in base station) of the CCN of target BS ownership; If the cooperative multipoint transmission of target BS not Support center scheduling method, so this indication information can be support the information of cooperative multipoint transmission and the information of the not cooperative multipoint transmission of Support center scheduling method, or this indication information can be the information that target BS supports the cooperative multipoint transmission of non-central scheduling.Such as, terminal is current, and what carry out is the cooperative multipoint transmission of central dispatching, the information that the information of cooperative multipoint transmission and base station not Support center scheduling method is supported in base station is carried in this handover request ack message, so, serving BS, according to this indication information, judges that target BS does not support the cooperative multipoint transmission to this terminal.Again such as, terminal is current, and what carry out is the cooperative multipoint transmission of central dispatching, carry base station in this handover request ack message and support the information of cooperative multipoint transmission and the information of base station Support center scheduling method, so, serving BS, according to this indication information, judges the cooperative multipoint transmission of target BS support to this terminal.

If this indication information carried in switching request response is base station support the information of cooperative multipoint transmission and the information of base station Support center scheduling method.And scheduling method centered by the cooperative multipoint transmission of above-mentioned terminal, then serving BS sends handoff notification message to other access network nodes in the cooperation set of the cooperative multipoint transmission of participation terminal can be specifically that the center cooperation point pointed in the cooperation set of the cooperative multipoint transmission participating in this terminal sends handoff notification message, optionally, the identification information of the center cooperation point of the cooperation set belonging to target BS is also carried in this switching request response.

Under this implementation, optionally, serving BS can also carry CoMP transmission capability requests information in the handover request message sending to target BS, and this CoMP transmission capability requests information is used to indicate target BS and sends the indication information whether it supports the cooperative multipoint transmission to above-mentioned terminal.Further, serving BS can also carry the indication information whether serving BS supports the cooperative multipoint transmission to above-mentioned terminal in handover request message.

Implementation two:

Whether each base station is supported to send to each base station to the indication information of the cooperative multipoint transmission of above-mentioned terminal by OAM in advance.

Whether serving BS supports the indication information of the cooperative multipoint transmission to described terminal according to each base station that OAM sends in advance, judges whether described target BS supports the cooperative multipoint transmission to described terminal.

Wherein, for the base station not supporting cooperative multipoint transmission, whether this base station that OAM sends is supported to the indication information of the cooperative multipoint transmission of above-mentioned terminal specifically, the information of cooperative multipoint transmission is not supported in this base station, so serving BS is according to this indication information, judges that target BS does not support the cooperative multipoint transmission to this terminal.

For the base station supporting cooperative multipoint transmission, whether this base station that OAM sends is supported to the indication information of the cooperative multipoint transmission of above-mentioned terminal specifically, the information (such as whether Support center scheduling method) of the cooperative multipoint transmission pattern that the information of cooperative multipoint transmission and this base station are supported is supported in this base station, optionally, the identification information of the CCN of base station ownership is also comprised.Concrete, if the cooperative multipoint transmission of base station Support center scheduling method, so this indication information can be the identification information (optionally also comprising the information that the cooperative multipoint transmission pattern that the information of cooperative multipoint transmission and base station are supported is supported in base station) of the CCN of target BS ownership; If the cooperative multipoint transmission of base station not Support center scheduling method, so this indication information can be support the information of cooperative multipoint transmission and the information of the not cooperative multipoint transmission of Support center scheduling method, or this indication information can be the information that the cooperative multipoint transmission of non-central scheduling is supported in base station.Such as, terminal is current, and what carry out is the cooperative multipoint transmission of central dispatching, this indication information is the information that the information of cooperative multipoint transmission and base station not Support center scheduling method is supported in base station, so, serving BS, according to this indication information, judges that target BS does not support the cooperative multipoint transmission to this terminal.Again such as, terminal is current, and what carry out is the cooperative multipoint transmission of central dispatching, this indication information is that the information of cooperative multipoint transmission and the information of base station Support center scheduling method are supported in base station, so, serving BS, according to this indication information, judges the cooperative multipoint transmission of target BS support to this terminal.

If this indication information that OAM sends is base station support the information of cooperative multipoint transmission and the information of base station Support center scheduling method.And scheduling method centered by the cooperative multipoint transmission of above-mentioned terminal, then serving BS sends handoff notification message to other access network nodes in the cooperation set of the cooperative multipoint transmission of participation terminal can be specifically that the center cooperation point pointed in the cooperation set of the cooperative multipoint transmission participating in this terminal sends handoff notification message, optionally, the identification information of the center cooperation point of the cooperation set belonging to target BS is also carried in this switching request response.

Implementation three:

The indication information of the cooperative multipoint transmission to above-mentioned terminal whether is supported in advance alternately separately between each base station.

Wherein, for the base station not supporting cooperative multipoint transmission, whether what this base station sent supports to the indication information of the cooperative multipoint transmission of above-mentioned terminal specifically, the information of cooperative multipoint transmission is not supported in this base station, so serving BS is according to this indication information, judges that target BS does not support the cooperative multipoint transmission to this terminal.

For the base station supporting cooperative multipoint transmission, whether what this base station sent supports to the indication information of the cooperative multipoint transmission of above-mentioned terminal specifically, this base station supports that the information of the cooperative multipoint transmission pattern that the information of cooperative multipoint transmission and this base station are supported (such as whether Support center scheduling method) is optional, also comprises the identification information of the CCN of base station ownership.Concrete, if the cooperative multipoint transmission of base station Support center scheduling method, so this indication information can be the identification information (optionally also comprising the information that the cooperative multipoint transmission pattern that the information of cooperative multipoint transmission and base station are supported is supported in base station) of the CCN of target BS ownership; If the cooperative multipoint transmission of base station not Support center scheduling method, so this indication information can be support the information of cooperative multipoint transmission and the information of the not cooperative multipoint transmission of Support center scheduling method, or this indication information can be the information that the cooperative multipoint transmission of non-central scheduling is supported in base station.Such as, terminal is current, and what carry out is the cooperative multipoint transmission of central dispatching, this indication information is the information that the information of cooperative multipoint transmission and base station not Support center scheduling method is supported in base station, so, serving BS, according to this indication information, judges that target BS does not support the cooperative multipoint transmission to this terminal.Again such as, terminal is current, and what carry out is the cooperative multipoint transmission of central dispatching, this indication information is that the information of cooperative multipoint transmission and the information of base station Support center scheduling method are supported in base station, so, serving BS, according to this indication information, judges the cooperative multipoint transmission of target BS support to this terminal.

The information of cooperative multipoint transmission and the information of target BS Support center scheduling method is supported if this indication information mutual in advance with target BS is target BS.And scheduling method centered by the cooperative multipoint transmission of above-mentioned terminal, then serving BS sends handoff notification message to other access network nodes in the cooperation set of the cooperative multipoint transmission of participation terminal can be specifically that the center cooperation point pointed in the cooperation set of the cooperative multipoint transmission participating in this terminal sends handoff notification message, optionally, the identification information of the center cooperation point of the cooperation set belonging to target BS is also carried in this switching request response.

Serving BS, according to the indication information whether supporting the cooperative multipoint transmission to above-mentioned terminal mutual in advance between base station, judges whether target BS supports the cooperative multipoint transmission to this terminal.

Implementation four:

Center cooperation point in the cooperation set at serving BS place sends each base station in network to the base station in cooperation set in advance and whether supports the indication information of the cooperative multipoint transmission to above-mentioned terminal.

Wherein, for the base station not supporting cooperative multipoint transmission, whether this base station that center cooperation point sends is supported to the indication information of the cooperative multipoint transmission of above-mentioned terminal specifically, the information of cooperative multipoint transmission is not supported in this base station, so serving BS is according to this indication information, judges that target BS does not support the cooperative multipoint transmission to this terminal.

For the base station supporting cooperative multipoint transmission, whether this base station that center cooperation point sends is supported to the indication information of the cooperative multipoint transmission of above-mentioned terminal specifically, the information (such as whether Support center scheduling method) of the cooperative multipoint transmission pattern that the information of cooperative multipoint transmission and this base station are supported is supported in this base station, optionally, the identification information of the CCN of base station ownership.Concrete, if the cooperative multipoint transmission of base station Support center scheduling method, so this indication information can be the identification information (optionally also comprising the information that the cooperative multipoint transmission pattern that the information of cooperative multipoint transmission and base station are supported is supported in base station) of the CCN of target BS ownership; If the cooperative multipoint transmission of base station not Support center scheduling method, so this indication information can be support the information of cooperative multipoint transmission and the information of the not cooperative multipoint transmission of Support center scheduling method, or this indication information can be the information that the cooperative multipoint transmission of non-central scheduling is supported in base station.Such as, terminal is current, and what carry out is the cooperative multipoint transmission of central dispatching, this indication information is the information that the information of cooperative multipoint transmission and base station not Support center scheduling method is supported in base station, so, serving BS, according to this indication information, judges that target BS does not support the cooperative multipoint transmission to this terminal.Again such as, terminal is current, and what carry out is the cooperative multipoint transmission of central dispatching, this indication information is that the information of cooperative multipoint transmission and the information of base station Support center scheduling method are supported in base station, so, serving BS, according to this indication information, judges the cooperative multipoint transmission of target BS support to this terminal.

If this indication information that CCN sends in advance is target BS support the information of cooperative multipoint transmission and the information of target BS Support center scheduling method.And scheduling method centered by the cooperative multipoint transmission of above-mentioned terminal, then serving BS sends handoff notification message to other access network nodes in the cooperation set of the cooperative multipoint transmission of participation terminal can be specifically that the center cooperation point pointed in the cooperation set of the cooperative multipoint transmission participating in this terminal sends handoff notification message, optionally, the identification information of the center cooperation point of the cooperation set belonging to target BS is also carried in this switching request response.

Wherein, by information interaction between the cooperation point of center, whether the base station of sharing in this cooperation set supports the indication information of the cooperative multipoint transmission to above-mentioned terminal.

Whether serving BS supports the indication information of the cooperative multipoint transmission to this terminal according to each base station that the center cooperation point in above-mentioned cooperation set sends in advance, judges whether target BS supports the cooperative multipoint transmission to this terminal.

Based on above-mentioned any implementation, preferably, before serving BS sends handoff notification message to the center cooperation point in the cooperation set of the cooperative multipoint transmission of participation terminal, according to the identification information of the center cooperation point of target BS place cooperation set, can judge whether this target BS and serving BS belong to same center cooperation point; If do not belonged to, serving BS sends above-mentioned handoff notification message to target BS, so that the center cooperation point that this handoff notification message sends to target BS to cooperate in set by target BS; If belonged to, described serving BS sends handoff notification message to the center cooperation point in the cooperation set of the cooperative multipoint transmission of the described terminal of participation.

In addition, MME changes in the S1 handoff procedure that maybe can not perform X2 switching, serving BS can also in handover required process, notification source MME target BS identifies and CCN mark belonging to target BS, target BS identifies by source MME, if CCN identification notification belonging to target BS is to target MME(MME relocate), CCN target BS mark and handover information belonging to target MME notification target base station, then CCN indicating target base station switches, and handover-related message is informed to target BS (in the case, MME needs the relation list of base station maintenance and CCN).The CoMP UE data do not transmitted give target BS alternately by serving BS.

Based on above-mentioned any serving BS side embodiment of the method, target BS is not supported to the situation of the cooperative multipoint transmission to terminal.It is different that the access network node comprised is gathered in cooperation, and accordingly, the specific implementation of step 160 is also different.

Situation one: if participate in only comprising center cooperation point and serving BS in the cooperation set of the cooperative multipoint transmission of above-mentioned terminal, so, the message to other access network nodes transmission instruction deexcitation cooperative multipoint transmission in the cooperation set of the cooperative multipoint transmission of the above-mentioned terminal of participation refers to: the message sending instruction deexcitation cooperative multipoint transmission to this center cooperation point.

Wherein, in the message of the instruction deexcitation cooperative multipoint transmission sent to center cooperation point except carrying above-mentioned information, the identification information of the information of deexcitation reason, the identification information of serving BS and/or cell-of-origin can also be carried.

Situation two: if the cooperation set participating in the cooperative multipoint transmission of above-mentioned terminal comprises other cooperative base station outside center cooperative node, serving BS and serving BS, so, the message sending instruction deexcitation cooperative multipoint transmission to other access network nodes in the cooperation set of the cooperative multipoint transmission of the above-mentioned terminal of participation can refer to: send instruction deexcitation cooperative multipoint transmission message to this center cooperation point, and sends instruction deexcitation cooperative multipoint transmission message to other cooperative base station in above-mentioned collaboration set conjunction.

Wherein, in the message of the instruction deexcitation cooperative multipoint transmission of center cooperation point transmission except carrying above-mentioned information, information of deexcitation reason etc. can also be carried.

In the message of the instruction deexcitation cooperative multipoint transmission sent to other cooperative base station except carrying above-mentioned information, the identification information of serving BS, cell-of-origin identification information, the running time-frequency resource information corresponding to cooperative multipoint transmission of terminal and/or the information of deexcitation reason etc. can also be carried.

Situation three: if the cooperation set participating in the cooperative multipoint transmission of above-mentioned terminal comprises other cooperative base station outside center cooperative node, serving BS and serving BS, so, the message to other access network nodes transmission instruction deexcitation cooperative multipoint transmission in the cooperation set of the cooperative multipoint transmission of the above-mentioned terminal of participation can also refer to: Jin Xianggai center cooperation point sends instruction deexcitation cooperative multipoint transmission message.

Accordingly, center cooperation point is after receiving instruction deexcitation cooperative multipoint transmission message, and other cooperative base station in closing to above-mentioned collaboration set send instruction deexcitation cooperative multipoint transmission message.

In the message of the instruction deexcitation cooperative multipoint transmission sent to other cooperative base station except carrying above-mentioned information, serving BS mark/cell-of-origin mark, the running time-frequency resource information corresponding to cooperative multipoint transmission of terminal and/or the information of deexcitation reason etc. can also be carried.

Situation four: if to participate in the cooperation set of the cooperative multipoint transmission of above-mentioned terminal other cooperative base station outside only serving BS and serving BS, so, the message to other access network nodes transmission instruction deexcitation cooperative multipoint transmission in the cooperation set of the cooperative multipoint transmission of the above-mentioned terminal of participation can also refer to: indicate deexcitation cooperative multipoint transmission message to other cooperative base station transmission in cooperation set.

Wherein, in the message of the instruction deexcitation cooperative multipoint transmission sent to other cooperative base station except carrying above-mentioned information, serving BS mark/cell-of-origin mark, the running time-frequency resource information corresponding to cooperative multipoint transmission of terminal and/or the information of deexcitation reason etc. can also be carried.

For above-mentioned situation one ~ situation three, if center cooperation point also has not to above-mentioned terminal transmission or the data of ACK not receiving above-mentioned terminal, also these data can be sent to serving BS.So, send the message of instruction deexcitation cooperative multipoint transmission to center cooperation point after, serving BS also may receive the above-mentioned terminal that above-mentioned center cooperation point sends identification information, not to this terminal transmission or the end position information not receiving the data of ACK of this terminal, the start position information of these data and these data; Then, serving BS associates identification information, these data, the start position information of these data and the end position information of these data of preserving this terminal.

For above-mentioned situation four, if there are other cooperative base station to also have not to above-mentioned terminal transmission or the data of ACK not receiving this terminal, also these data can be sent to serving BS.So, after other cooperative base station in closing to above-mentioned collaboration set send the message of instruction deexcitation cooperative multipoint transmission, serving BS also may receive the above-mentioned terminal that other cooperative base station send identification information, not to this terminal transmission or the end position information not receiving the data of ACK of this terminal, the start position information of these data and these data; Then, serving BS associates identification information, these data, the start position information of these data and the end position information of these data of preserving this terminal.

Wherein, the object that association is preserved is, serving BS, when needing to process for these data of this terminal, can pass through incidence relation, determines the data of this terminal and corresponding data message.The present invention does not limit the specific implementation that association is preserved.

For above-mentioned situation one ~ tetra-, if serving BS receive that center cooperation point or other cooperative base station send not to above-mentioned terminal transmission or the data of ACK not receiving this terminal, both can by these data interactions to target BS, also can before the handover request ack message receiving target BS transmission, according to start position information and the end position information of above-mentioned data, be that above-mentioned terminal order dispatches these data according to unicast pattern.

Cooperative multipoint transmission control method in the another kind of cell switch process that the embodiment of the present invention provides as shown in Figure 2, specifically comprises following operation:

In the cooperation set of the cooperative multipoint transmission of step 200, participation terminal this terminal serving BS outside access network node receive the message of instruction deexcitation cooperative multipoint transmission.

Wherein, the identification information of this terminal and the indication information of deexcitation cooperative multipoint transmission is at least carried in the message of this instruction deexcitation multicast communication.

Step 210, this access network node determine this terminal according to the identification information of this terminal, and the instruction of indication information according to this deexcitation cooperative multipoint transmission, the cooperative multipoint transmission of terminal described in deexcitation.

In the embodiment of the present invention, above-mentioned access network node both can be the CCN in above-mentioned cooperation set, also can be other cooperative base station in above-mentioned cooperation set outside serving BS.

If this access network node is CCN, the identification information of the information of deexcitation reason, the identification information of serving BS and/or cell-of-origin in the message of so above-mentioned instruction deexcitation cooperative multipoint transmission, can also be carried.

If this access network node is other cooperative base station, the identification information of serving BS, the identification information of cell-of-origin, the running time-frequency resource information corresponding to cooperative multipoint transmission of terminal and/or the information of deexcitation reason etc. in the message of so above-mentioned deexcitation cooperative multipoint transmission, can also be carried.

Wherein, access network node deexcitation, to the cooperative multipoint transmission of this terminal, refers to and stops all may affecting the behavior of serving BS to this terminal scheduling.Which operation it specifically comprises, and depending on the CoMP transmission pattern of this UE, the CoMP ability of this access network node etc., the embodiment of the present invention does not do concrete restriction.

Such as, if access network node is CCN, then this CCN is after the message receiving instruction deexcitation cooperative multipoint transmission, no longer carries out scheduling controlling to this UE.If be S-GW<->CCN<-> serving BS <-> terminal to the data surface path of the cooperative multipoint transmission of this terminal, this CCN also no longer carries out transfer of data to this UE.If this CCN also possesses the data buffer storage function to this terminal, this CCN no longer carries out buffer memory to the data of this terminal, and empties the data in buffer memory.

Such as, if access network node is other cooperative base station, then other cooperative base station are after the message receiving instruction deexcitation cooperative multipoint transmission, stop the transfer of data to this terminal, discharge the running time-frequency resource that the CoMP transmission of this terminal is corresponding.If when carrying out CoMP transmission to this terminal, be limited to use pre-coding matrix, other cooperative base station can also remove the restriction to this pre-coding matrix.In addition, for the data not yet transmitted, other cooperative base station can give serving BS alternately, also can be abandoned, and do not give serving BS alternately.

In handling process shown in Fig. 2, carrying out in cell switch process to terminal, other access network node deexcitations in cooperation set are for the cooperative multipoint transmission of this terminal, do not need the continuity of the cooperative multipoint transmission ensureing terminal, solve and perform the CoMP UE of cooperative multipoint transmission when carrying out cell merge, to the problem how cooperative multipoint transmission of CoMP UE processes.

Based on the embodiment shown in Fig. 2, if access network node is CCN, and after the message receiving instruction deexcitation cooperative multipoint transmission, this CCN also has not to this terminal transmission or the data of ACK not receiving this terminal.So, after the message of the instruction deexcitation cooperative multipoint transmission that the serving BS of CCN receiving terminal sends, can also by the identification information of above-mentioned terminal, the serving BS not sending to this terminal to this terminal transmission or the end position information that do not receive the data of ACK of this terminal, the start position information of these data and these data.

Based on above-mentioned any access network node side embodiment of the method for Fig. 2, if this access network node is CCN, and also have other cooperative base station in cooperation set.So, after the message of the instruction deexcitation cooperative multipoint transmission of the serving BS transmission of CCN receiving terminal, the message of instruction deexcitation cooperative multipoint transmission can also be sent to other cooperative base station outside serving BS in the cooperation set of the cooperative multipoint transmission of participation terminal, send in the message of the instruction deexcitation cooperative multipoint transmission of other cooperative base station and at least carry the identification information of this terminal and the indication information of deexcitation cooperative multipoint transmission.Optionally, serving BS mark, cell-of-origin mark, the running time-frequency resource information corresponding to cooperative multipoint transmission of terminal and/or the information of deexcitation reason etc. can also be carried in the message of this instruction deexcitation cooperative multipoint transmission.

From the description of serving BS side embodiment of the method, when also comprising other cooperative base station in the set that cooperates, serving BS also may send the message of instruction deexcitation cooperative multipoint transmission to other cooperative base station.In order to avoid repeating to send, pre-configured or agreement the message indicating deexcitation cooperative multipoint transmission specifically still can be sent to other cooperative base station by serving BS by CCN.

Based on the embodiment shown in Fig. 2, if access network node is other cooperative base station outside serving BS, this other cooperative base station also has not to this terminal transmission or the data of ACK not receiving this terminal.So, after the message of the instruction deexcitation cooperative multipoint transmission that the serving BS of other cooperative base station receiving terminals sends, can also by the identification information of above-mentioned terminal and the serving BS not sending to this terminal to this terminal transmission or the data of ACK that do not receive this terminal.Optionally, the start position information of these data and the end position information of these data is also sent.

Cooperative multipoint transmission control method in the another kind of cell switch process that the embodiment of the present invention provides as shown in Figure 3, specifically comprises following operation:

In the cooperation set of the cooperative multipoint transmission of step 300, participation terminal this terminal serving BS outside access network node receive handoff notification message.

Wherein, at least carry the identification information of this terminal, the identification information of this target BS and cooperative multipoint transmission in this handoff notification message and maintain indication information.

Step 310, this access network node determine this terminal according to the identification information of this terminal, this target BS is determined according to the identification information of this target BS, and maintain indication information according to this cooperative multipoint transmission, determine that this terminal switch proceeds cooperative multipoint transmission to this target BS.

The access network node that the embodiment of the present invention provides, is carrying out in cell switch process terminal, if receive handoff notification message, this access network node determines the cooperative multipoint transmission maintaining terminal.Solve and perform the CoMP UE of CoMP transmission when carrying out cell merge, to the problem how cooperative multipoint transmission of CoMP UE processes.

Access network node in the embodiment of the present invention both can be the CCN in above-mentioned cooperation set, also can be other cooperative base station in above-mentioned cooperation set outside serving BS.

If this access network node is the CCN in above-mentioned cooperation set, preferably, the identification information of the center cooperation point of this target BS place cooperation set is also carried in above-mentioned handoff notification message.

If this access network node is the CCN in above-mentioned cooperation set, based on any embodiment of Fig. 3, preferably, after proceeding cooperative multipoint transmission after determining terminal switch to target BS, the method also comprises: the scheduling controlling suspending the cooperative multipoint transmission to this terminal; Then according to the identification information of center cooperation point of target BS place cooperation set, center cooperation point whether this center cooperation point of this target BS place cooperation set is judged; If so, after confirming this terminal switch to target BS, do not initiate path handoff procedure to core net node, continue the scheduling controlling of this terminal being carried out to cooperative multipoint transmission.

If not, then center cooperation point can not deal with, also can notification service base station, so that serving BS sends above-mentioned handoff notification message to target BS.

If this access network node is the CCN in above-mentioned cooperation set, based on any embodiment of Fig. 3, preferably, after proceeding cooperative multipoint transmission after determining terminal switch to target BS, the method also comprises: suspend the cooperative multipoint transmission to this terminal; After confirming this terminal switch to target BS, carry out alternately with this target BS, continue to carry out cooperative multipoint transmission to this terminal.

To coordinate with network side node below and be embodied as example, the method that the embodiment of the present invention provides will be described.

Before processing procedure is described, first introduce the data transmission architecture under the CoMP central dispatching scene of application the method.

Data transfer path between framework one: CoMP UE and core net is that S-GW<-> serving BS <->CoMP UE(and data-direct connection interface are present between the serving BS of S-GW and CoMP UE), CCN and serving BS all possess scheduling feature.

Under this framework, the cooperative scheduling that CCN and serving BS perform can have following several implementation:

CCN performs the master scheduling function to CoMP UE, and serving BS is dispatched and transfer of data according to CCN scheduled for executing CoMPUE transfer of data and non-CoMP UE;

CCN performs the master scheduling function to CoMP UE, and responsible CoMP UE dispatches cooperative multipoint transmission transmission, and serving BS is responsible for the scheduling of CoMP UE unicast and scheduling and the transfer of data such as transmission and non-CoMP UE scheduling;

CCN performs the pre-scheduling to CoMP UE, and serving BS performs the actual schedule of CoMP UE.

In addition, CCN also can possess the buffer memory (buffer) to CoMP UE temporary data storage function and correspondence further.

Data transfer path between framework two: CoMP UE and core net is that S-GW<->CCN<-> serving BS <->UE(and data-direct connection interface are present between S-GW and CCN), CCN and serving BS all possess scheduling feature.

Under this framework, CCN is the data relay point of CoMP UE and core net.In UE RCC connection establishment process, serving BS knows UE type, if support the UE of CoMP transmission, to factors such as the tenability situation of CoMP and network side strategies, serving BS judges whether that the RAN side user plane anchor point indicating this UE of core net to be connected is CCN according to UE type (whether supporting CoMP transmission), current network; Or utilize prior art that user face anchor point is based upon serving BS, can when triggering CoMP UE cooperative multipoint transmission, changing user face anchor point by processes such as switching, path handover request (path switch request) is CCN.Especially, under this framework, the control plane anchor point of user can be the serving BS of this UE, also can be MME<->CCN<-> serving BS <-> terminal by chain of command route diversion, to reduce handover overhead.

Scheduling implementation under this framework and framework one similar, repeat no more here.

For above-mentioned framework one, do not support that the X2 of the target BS of CoMP transmission switches to example with CoMP UE from supporting the serving BS of CoMP transmission to be switched to, CoMP transmission control method in a kind of handoff procedure and handoff procedure as shown in Figure 4, specifically comprises following operation:

Step 400, serving BS are determined to carry out cell merge to CoMP UE.

Concrete, serving BS reports handover measurement reported result (as RSRP/RSRQ) according to CoMP UE, determines whether to meet switching condition.If met, then determine to carry out cell merge to CoMP UE.

Step 410a, serving BS send handover request message to each alternative target base station.

Wherein, handoff request message prepares relevant parameter containing switching, and performs the work such as acceptance judging, radio-resource-configuration in order to help alternative target base station.

Optionally, also comprise CoMP transmission capability requests information in this handover request message, this CoMP transmission capability requests information is used to indicate target BS and sends the indication information whether it supports the cooperative multipoint transmission to above-mentioned terminal.Further, serving BS can also carry the indication information whether serving BS supports the cooperative multipoint transmission to above-mentioned terminal in handover request message.

Step 420a, permission receive the alternative target base station of above-mentioned CoMP UE to send switching request response to serving BS.

Concrete, each alternative target base station receives the handover request message that serving BS sends, and carries out acceptance judging according to information such as service quality (QoS) information of carrying to be accepted, current interference, load conditions.If alternative target base station allows to receive this CoMP UE, then carry out bottom configuration, to prepare to switch.

The wireless resource configuration to this CoMPUE is at least carried to the handover request ack message that serving BS returns in alternative target base station.

Optionally, the information indicating whether to support the information of CoMP transmission and the CoMP transmission pattern of support can also be carried in the handover request ack message that alternative target base station returns to serving BS.Both after the CoMP transmission capability requests information receiving serving BS transmission, these information can be sent, also can initiatively send these information.The configuration in advance of concrete basis or agreement and determine.

Step 430a, serving BS receive alternative target base station send handover request ack message after, to CoMP UE send switching command, stop the data transmit-receive of this CoMP UE on this base station, and will not transmit or unacknowledged data alternately give target BS.

Wherein, if there is multiple alternative target base station to return handover request ack message to serving BS, then serving BS therefrom selects one as target BS.

Wherein, serving BS sends to the switching command of CoMP UE can be carried in RRC connection reconfiguration message.

Step 440a, CoMP UE switch to the community of target BS after performing the synchronization with target BS.

Concrete, after CoMP UE receives the switching command of serving BS transmission, stop, with the data transmit-receive of serving BS, performing synchronization with target BS and operating, carry out Radio Resource and carrying reprovision.

After synchronously completing, CoMP UE returns handoff completion message (RRC has reshuffled message) to target BS.After target BS receives this message, return the ACK message of RLC, start the transmission carrying out downlink data simultaneously; And notify core net transduction pathway (trigger path switch request process, notice core network data transmission path changes to SGW<-> target BS <->CoMP UE).After target BS receives path Handover Request Acknowledge (path switch request ack), notification service base station discharges old carrying and UE context.CoMP UE, after receiving RRC and having reshuffled the ACK of message, carries out upstream data transmission with target BS target.

Optionally, target BS (namely, serving BS after switching) according to the wireless channel condition of the type (whether supporting CoMP transmission) of above-mentioned CoMP UE, above-mentioned CoMP UE, the factor such as ability, base station strategy of this base station support CoMP, determine whether to start the CoMP transmission to above-mentioned CoMP UE.

If determine to start the CoMP transmission to above-mentioned CoMP UE, but be the non-TM10 of transmission mode of UE configuration before, then target BS needs to reshuffle CoMP UE transmission mode is TM10.

If target BS is determined not start the CoMP transmission to above-mentioned CoMP UE, then according to unicast pattern, scheduled transmission is carried out to this CoMP UE.

If target BS is determined to start the CoMP transmission to above-mentioned CoMP UE, target BS sends to the CCN of this target BS place cooperation set the message indicating CoMP transmission to activate.

Concrete, if target BS does not connect with its CCN, then target BS triggers the connection establishment process between CCN, and after connection establishment completes, sends the message of instruction CoMP transmission activation to its CCN.At least comprise the identification information of CoMP UE, the identification information of this target BS, the identification information of present access subzone in this message and/or activate the information such as reason.

If the framework of target BS and its CCN is above-mentioned framework two, target BS judge activate CoMPUE cooperative multipoint transmission function and when notifying CCN, trigger handoff procedure simultaneously, or path switch request, or other existing processes, change CoMP UE transfer of data anchor point, changes to CCN by the transfer of data anchor point of this CoMP UE.Or the cooperative multipoint transmission of CoMP UE also can be activated by CCN.

Step 430b, serving BS, according to the information indicating whether to support the information of CoMP transmission and the CoMP transmission pattern of support of carrying in above-mentioned switching request response, determine that target BS does not support the CoMP transmission to above-mentioned CoMP UE.

It should be noted that, if serving BS by other means (execution mode two ~ tetra-of as above embodiment description) knows whether target BS supports the information of CoMP transmission and the CoMP transmission pattern of support in advance, then can determine that any time after carrying out cell merge determines that target BS does not support the CoMP transmission to above-mentioned CoMP UE.

Step 440b, serving BS deexcitation to the CoMP transmission of CoMP UE, and send the message of instruction deexcitation CoMP transmission to CCN.

Wherein, the message of the instruction deexcitation CoMP transmission of CCN is sent at least to carry identification information and the CoMP transmission deexcitation indication information of this CoMP UE.Optionally, the information such as deexcitation reason can also be carried.

It should be pointed out that step 430a and step 430b can executed in parallel, the priority do not existed in sequential limits.

Step 450b, CCN carry out the operation of deexcitation CoMP transmission after receiving the message of the instruction deexcitation CoMP transmission that serving BS sends to this CoMP UE.

Concrete, CCN first according to the identification information of the CoMP UE carried in message, determine this message for CoMP UE.Then, according to the CoMP transmission deexcitation indication information carried in message, to the cooperative multipoint transmission controlling functions deexcitation of this CoMP UE, no longer scheduling controlling is carried out to the transfer of data of this CoMP UE, no longer carry out the transfer of data to CoMP UE, the behavior stopping all may affecting serving BS dispatching this CoMP UE.If when CCN also possesses the buffer to CoMP UE temporary data storage function and correspondence, CCN also deexcitation to should the temporary data storage function of CoMP UE, and empties the data in buffer.

If also carry the information of deexcitation reason in message, CCN also records this deexcitation reason, so that subsequent analysis controls to use.

Optionally, other cooperative base station also comprised in the cooperation set of the CoMP transmission of above-mentioned CoMP UE outside serving BS if participate in, can be sent the message of instruction deexcitation CoMP transmission to other cooperative base station in cooperation set by serving BS.

Send to the identification information and CoMP transmission deexcitation indication information that at least carry above-mentioned CoMP UE in the message of the instruction deexcitation CoMP transmission of other cooperative base station.Optionally, following at least one information can also be comprised: the information such as running time-frequency resource information, deexcitation reason that the CoMP transmission of the identification information of serving BS, the identification information of cell-of-origin, this CoMP UE is corresponding.

It should be pointed out that the priority that this operation and step 440b do not exist in sequential limits, can executed in parallel.

Optionally, other cooperative base station also comprised in the cooperation set of the CoMP transmission of above-mentioned CoMP UE outside serving BS if participate in, also can be, after CCN receives the message of instruction deexcitation CoMP transmission, sent the message of instruction deexcitation CoMP transmission to other cooperative base station in cooperation set by CCN.

Other cooperative base station in cooperation set are after the message receiving instruction deexcitation CoMP transmission, and deexcitation is to the CoMP transmission of CoMP UE.

Concrete, other cooperative base station first according to the identification information of the CoMP UE carried in message, determine this message for CoMP UE.Then, according to the CoMP transmission deexcitation indication information carried in message, no longer carry out the transfer of data to CoMP UE, discharge running time-frequency resource corresponding to the CoMP transmission of this CoMP UE and (if carry the information of this running time-frequency resource in message, then discharge corresponding running time-frequency resource according to the information of this running time-frequency resource.If do not carried, then determine this running time-frequency resource by other means, this running time-frequency resource information is preserved in such as this locality, or obtains this running time-frequency resource information etc. from serving BS or CCN separately).If when carrying out CoMP transmission to this CoMP UE, be limited to use pre-coding matrix, other cooperative base station can also remove the restriction to this pre-coding matrix.If also carry the information of deexcitation reason in message, other cooperative base station also preserve the information of this deexcitation reason, to analyze use in the future.For not yet transmit to the data of this CoMP UE, other cooperative base station can be abandoned, and do not give serving BS alternately.

For above-mentioned framework two, do not support that the X2 of the target BS of CoMP transmission switches to example with CoMP UE from supporting the serving BS of CoMP transmission to be switched to, the CoMP transmission control method in a kind of handoff procedure and handoff procedure can with reference to the handling process of Fig. 4.

But, receive the message of the instruction deexcitation CoMP transmission that serving BS sends at CCN after, if there are the data of the ACK not transmitting or do not receive above-mentioned CoMP UE to above-mentioned CoMP UE, to serving BS send this CoMP UE identification information, do not transmit to CoMP UE and/or do not receive the data (these data are made up of several RB) of ACK of this CoMP UE, ED (data end) mark that each RB is corresponding, the data that each RB is corresponding start the information such as (data start) mark.

The data end mark that the identification information of serving BS association preservation CoMP UE, above-mentioned data, each RB are corresponding and data start identify.

For the data that CCN sends, serving BS both can be dispatched according to non-cooperating multicast communication these data before receiving switching request response.Also can in hand-off execution process, by these data in company with data notification waiting for transmission to target BS.

After serving BS receives release instruction, trigger between CCN should the Connection Release process of interface of CoMP UE.

For above-mentioned framework two, with CoMP UE from supporting that the X2 of the target BS that the serving BS of CoMP transmission is switched to same CCN switches to example, a kind of CoMP transmission control method in handoff procedure and handoff procedure as shown in Figure 5, comprising:

Step 500, serving BS are determined to carry out cell merge to CoMP UE.

Step 510a, serving BS send handover request message to each alternative target base station.

Step 520a, permission receive the alternative target base station of above-mentioned CoMP UE to send switching request response to serving BS.

Step 530a, serving BS receive alternative target base station send handover request ack message after, to CoMP UE send switching command, stop the data transmit-receive of this CoMP UE on this base station, and will not transmit or unacknowledged data alternately give target BS.

Step 540a, CoMP UE switch to the community of target BS after performing the synchronization with target BS.

After synchronously completing, CoMP UE returns handoff completion message (RRC has reshuffled message) to target BS.After target BS receives this message, return the ACK message of RLC, start the transmission carrying out downlink data simultaneously.After target BS receives path switching confirmation, notification service base station discharges old carrying and UE context.CoMP UE, after receiving RRC and having reshuffled the ACK of message, carries out upstream data transmission with target BS target.

Step 530b, serving BS indicate whether to support the information of the information of CoMP transmission and the CoMP transmission pattern of support and the CCN information of target BS ownership according to what carry in above-mentioned switching request response, determine the CoMP transmission of target BS support to above-mentioned CoMP UE, and belong to same CCN.

It should be noted that, if serving BS by other means (execution mode two ~ tetra-of as above embodiment description) knows whether target BS supports the CCN information of the information of CoMP transmission and the CoMP transmission pattern of support and target BS ownership, then can determine that any time after carrying out cell merge determines the CoMP transmission of target BS support to above-mentioned CoMP UE in advance.

It should be pointed out that step 510a and step 510b can executed in parallel, the priority do not existed in sequential limits.

Step 540b, serving BS send handoff notification message to CCN.

Wherein, send in the described handoff notification message of CCN and carry the identification information of CoMP UE, the identification information of target BS and cooperative multipoint transmission maintenance indication information.

After step 550b, CCN receive handoff notification message, this CoMP UE is determined according to the identification information of this CoMP, this target BS is determined according to the identification information of this target BS, and maintain indication information according to this cooperative multipoint transmission, determine that this CoMP UE proceeds cooperative multipoint transmission after switching to this target BS.

Step 560b, CCN suspend scheduling controlling to the cooperative multipoint transmission of this terminal, and the identification information of CCN according to the cooperation set of target BS place, judge CCN whether this CCN of this target BS place cooperation set.

If so, step 570b is performed, otherwise, end operation.

After step 570b, CCN confirm that this CoMP UE is switched to target BS, do not initiate path handoff procedure to core net node, continue the scheduling controlling of this terminal being carried out to cooperative multipoint transmission.

Wherein, to the process that this CoMP UE carries out connection establishment, what CCN can be triggered by target BS confirms that this CoMP UE is switched to target BS with it.Concrete, in this process, target BS is by (optional for the identification information of target BS, also have the identification information of access community after switching) and handoff procedure in inform CCN for the identification information etc. of the UE of CoMP UE distribution, CCN is by finally for the identification information of the UE of CoMP UE configuration informs to target BS; Or target BS is by (optional for the identification information of target BS, also have the identification information of access community after switching) and handoff procedure in inform CCN for the identification information etc. of the UE of CoMP UE distribution, CCN no longer redistributes the identification information of UE, but the mark identification of the UE mark using target BS to notify and base station is from the different UEs of different base station.Then, target BS notice CCN handoff completion message, comprises in this message: switched instruction, UE mark and Base Station Identification.CCN, according to this message received, determines that corresponding CoMP UE is switched to target BS, can start transfer of data and scheduling controlling, and without the need to actuate path handover request (path switch request) process.

The path swithcrequest process that CCN also can be initiated by target BS confirms that this CoMP UE is switched to target BS.Concrete, target BS is by path switch request process notifications CCN route diversion, and CCN, according to this notice, confirms that this CoMP UE is switched to target BS.And according to this target BS determined before under this CCN, therefore determine without the need to initiating path switch request process to MME, by CCN notification target base station path Handover Request Acknowledge (path switch request ack).

In addition, if some carrying target BS can not be received, the follow-up E-RAB RELEASE INDICATION process notifications MME that can adopt revises carrying.

In the embodiment of the present invention, above-mentioned target BS notifies that the so-called Base Station Identification of each CCN and UE mark can for following several: target BS mark, the UE mark of this CoMP UE of identification of distributing between CCN and target BS and IMSI; Or UE mark (Old eNB UE X2AP ID) under target BS mark, the UE mark of distributing between CCN and target BS, serving BS mark, cell-of-origin; Or the UE of this CoMP UE of identification that the UE mark of this CoMP UE of identification that target BS identifies, distribute between CCN and target BS, serving BS mark, CCN and serving BS distribute identifies.The UE of this CoMP UE of identification that CCN and serving BS can distribute by serving BS in handover request message identifies or IMSI or Old eNB UE X2AP ID informs to target BS.

If CCN judges that the CCN of this target BS place cooperation set is not this CCN, also handoff notification message can be sent to target BS in notification service base station, so that this handoff notification message is sent to the CCN of its place cooperation set by target BS, the CCN in the cooperation set of this target BS place carries out cooperative multipoint transmission control.Concrete operations can refer to step 550b ~ step 570b.Certainly, also by serving BS before sending handoff notification message to CCN, can judge whether target BS belongs to same CCN with this base station, if so, then send handoff notification message to CCN, otherwise, send handoff notification message to target BS.

It should be pointed out that if target BS and serving BS be not under same CCN.Target BS changes to SGW<->CCN<-> target BS by path switch request process notifications core network data transmission path.

Based on the inventive concept same with method, embodiments provide a kind of base station, as shown in Figure 6, this base station comprises:

Cell switch determining module 601, carries out cell merge for determining to terminal;

Messaging interface 602, after determining to carry out cell merge to described terminal in described cell switch determining module 601, sends handover request message to target BS; After receiving the handover request ack message of described target BS transmission, send switching command to described terminal, to indicate described terminal switch to the community of described target BS, described terminal is the terminal performing cooperative multipoint transmission;

Cooperative multipoint transmission control module 603, after determining to carry out cell merge to described terminal in described cell switch determining module 601, judges whether described target BS supports the cooperative multipoint transmission to described terminal; If described target BS support is to the cooperative multipoint transmission of described terminal, to participate in described terminal cooperative multipoint transmission cooperation set in other access network nodes send handoff notification message, carry the identification information of described terminal, the identification information of described target BS and cooperative multipoint transmission in described handoff notification message and maintain indication information; If described target BS does not support the cooperative multipoint transmission to described terminal, deexcitation is to the cooperative multipoint transmission of described terminal, and the message of instruction deexcitation cooperative multipoint transmission is sent to other access network nodes in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, carry the identification information of described terminal and the indication information of deexcitation cooperative multipoint transmission in the message of described instruction deexcitation multicast communication.

Preferably, when judging the cooperative multipoint transmission whether described target BS support described terminal, described cooperative multipoint transmission control module 603 specifically for:

Based on above-mentioned preferred embodiment, after described cell switch determining module determines to carry out cell merge to described terminal, before described cooperative multipoint transmission control module judges the cooperative multipoint transmission whether described target BS is supported described terminal, described cooperative multipoint transmission control module 603 can also be used for:

Based on above-mentioned any base station embodiment, preferably, if the cooperation set participating in the cooperative multipoint transmission of described terminal comprises center cooperation point, when described cooperative multipoint transmission control module 603 sends the message of instruction deexcitation cooperative multipoint transmission to other access network nodes in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, specifically for:

On this basis, preferably, if participate in other cooperative base station also comprised in the cooperation set of the cooperative multipoint transmission of described terminal outside described base station, described cooperative multipoint transmission control module 703 to participate in described terminal cooperative multipoint transmission cooperation set in other access network nodes send the message of instruction deexcitation cooperative multipoint transmission time, also for:

Based on above-mentioned any base station embodiment, preferably, if the cooperation set participating in the cooperative multipoint transmission of described terminal comprises other cooperative base station outside described base station, but do not comprise center cooperation point, when described cooperative multipoint transmission control module 603 sends the message of instruction deexcitation cooperative multipoint transmission to other access network nodes in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, specifically for:

Based on the inventive concept same with method, embodiments provide a kind of access network node, described access network node be the cooperative multipoint transmission of participation terminal cooperation set described in access network node outside Terminal Service base station, as shown in Figure 7, this access network node comprises:

Cooperative multipoint transmission instruction receiver module 701, for receiving the message of instruction deexcitation cooperative multipoint transmission, carries the identification information of described terminal and the indication information of deexcitation cooperative multipoint transmission in the message of described instruction deexcitation multicast communication; Or for receiving handoff notification message, carrying the identification information of described terminal, the identification information of described target BS and cooperative multipoint transmission in described handoff notification message and maintaining indication information;

Cooperative multipoint transmission deexcitation module 702, when described cooperative multipoint transmission instruction receiver module 701 receives the message of instruction deexcitation cooperative multipoint transmission, described cooperative multipoint transmission deexcitation module is used for determining described terminal according to the identification information of described terminal, and the instruction of indication information according to described deexcitation cooperative multipoint transmission, the cooperative multipoint transmission of terminal described in deexcitation;

Cooperative multipoint transmission maintains module 703, when described cooperative multipoint transmission instruction receiver module 701 receives handoff notification message, described cooperative multipoint transmission maintains module and is used for determining described terminal according to the identification information of described terminal, described target BS is determined according to the identification information of described target BS, and maintain indication information according to described cooperative multipoint transmission, proceed cooperative multipoint transmission after determining described terminal switch to described target BS.

Based on above-mentioned any access network node embodiment, preferably, after described cooperative multipoint transmission maintains and proceeds cooperative multipoint transmission after module 703 determines described terminal switch to described target BS, also for:

Based on above-mentioned any access network node embodiment, preferably, if described access network node is center cooperation point, the first data transmission blocks is also comprised;

If described access network node is other cooperative base station outside serving BS, also comprise the second data transmission blocks;

After described cooperative multipoint transmission instruction receiver module is sent to the message of instruction deexcitation cooperative multipoint transmission, described second data transmission blocks is used for the identification information of described terminal and the serving BS not sending to described terminal to described terminal transmission or the data of correct confirmation that do not receive described terminal; Or, after described cooperative multipoint transmission instruction receiver module is sent to the message of instruction deexcitation cooperative multipoint transmission, described second data transmission blocks is used for the identification information of described terminal, the serving BS not sending to described terminal to described terminal transmission or the end position information that do not receive the data of correct confirmation of described terminal, the start position information of described data and described data.

Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.

The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.

Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims

1. the cooperative multipoint transmission control method in a cell switch process, described cell switch process comprises: serving BS is after determining to carry out cell merge to terminal, handover request message is sent to target BS, and after the handover request ack message receiving the transmission of described target BS, switching command is sent to described terminal, to indicate described terminal switch to the community of described target BS, described terminal is the terminal performing cooperative multipoint transmission; It is characterized in that, described cooperative multipoint transmission control method comprises:

Described serving BS, after determining to carry out cell merge to described terminal, judges whether described target BS supports the cooperative multipoint transmission to described terminal;

If described target BS support is to the cooperative multipoint transmission of described terminal, described serving BS to participate in described terminal cooperative multipoint transmission cooperation set in other access network nodes send handoff notification message, carry the identification information of described terminal, the identification information of described target BS and cooperative multipoint transmission in described handoff notification message and maintain indication information;

If described target BS does not support the cooperative multipoint transmission to described terminal, described serving BS deexcitation is to the cooperative multipoint transmission of described terminal, and the message of instruction deexcitation cooperative multipoint transmission is sent to other access network nodes in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, carry the identification information of described terminal and the indication information of deexcitation cooperative multipoint transmission in the message of described instruction deexcitation multicast communication.

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

Whether described serving BS supports the indication information of the cooperative multipoint transmission to described terminal according to the described target BS carried in described handover request ack message, judges whether described target BS supports the cooperative multipoint transmission to described terminal; Or,

Whether described serving BS supports the indication information of the cooperative multipoint transmission to described terminal according to each base station that OAM sends in advance, judges whether described target BS supports the cooperative multipoint transmission to described terminal; Or,

Described serving BS, according to the indication information whether supporting the cooperative multipoint transmission to described terminal mutual in advance between base station, judges whether described target BS supports the cooperative multipoint transmission to described terminal; Or,

Whether described serving BS supports the indication information of the cooperative multipoint transmission to described terminal according to each base station that the center cooperation point in described cooperation set sends in advance, judges whether described target BS supports the cooperative multipoint transmission to described terminal.

3. method according to claim 2, is characterized in that, describedly judges whether described target BS is supported, to the cooperative multipoint transmission of described terminal, to comprise:

If whether described target BS is supported to indicate described target BS not support cooperative multipoint transmission to the indication information of the cooperative multipoint transmission of described terminal, described serving BS judges that described target BS does not support the cooperative multipoint transmission to described terminal;

If whether described target BS supports the cooperative multipoint transmission indication information of the cooperative multipoint transmission of described terminal being indicated to described target BS not Support center scheduling method, but scheduling method centered by the cooperative multipoint transmission of described terminal, described serving BS judges that described target BS does not support the cooperative multipoint transmission to described terminal;

If whether described target BS supports the cooperative multipoint transmission indication information of the cooperative multipoint transmission of described terminal being indicated to described target BS Support center scheduling method, and scheduling method centered by the cooperative multipoint transmission of described terminal, described serving BS judges that described target BS support is to the cooperative multipoint transmission of described terminal; If whether described target BS supports the cooperative multipoint transmission indication information of the cooperative multipoint transmission of described terminal being indicated to described target BS Support center scheduling method, whether described target BS supports the identification information of the center cooperation point indication information of the cooperative multipoint transmission of described terminal also being indicated to the cooperation set of described target BS place.

4. method according to claim 3, it is characterized in that, if whether described target BS supports the identification information indication information of the cooperative multipoint transmission of described terminal being indicated to the cooperative multipoint transmission of described target BS Support center scheduling method and the center cooperation point of described target BS place cooperation set, and scheduling method centered by the cooperative multipoint transmission of described terminal, described serving BS sends handoff notification message to other access network nodes in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, comprising:

Described serving BS sends handoff notification message to the center cooperation point in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, also carries the identification information of the center cooperation point of described target BS place cooperation set in described handoff notification message.

5. method according to claim 4, is characterized in that, before described serving BS sends handoff notification message to the center cooperation point in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, the method also comprises:

Described serving BS, according to the identification information of the center cooperation point of described target BS place cooperation set, judges whether described target BS and described serving BS belong to same center cooperation point;

Described serving BS sends handoff notification message to the center cooperation point in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, comprising:

If described target BS and described serving BS belong to same center cooperation point, described serving BS sends handoff notification message to the center cooperation point in the cooperation set of the cooperative multipoint transmission of the described terminal of participation.

6. method according to claim 2, is characterized in that, described serving BS is after determining to carry out cell merge to described terminal, and before judging the cooperative multipoint transmission whether described target BS is supported described terminal, the method also comprises:

If described serving BS determines that described cell merge is that S1 switches, deexcitation is to the cooperative multipoint transmission of described terminal, and the message of instruction deexcitation cooperative multipoint transmission is sent to other access network nodes in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, carry the identification information of described terminal and the indication information of deexcitation cooperative multipoint transmission in the message of described instruction deexcitation multicast communication.

7. the method according to any one of claim 1 ~ 6, it is characterized in that, if the cooperation set participating in the cooperative multipoint transmission of described terminal comprises center cooperation point, other access network nodes in the cooperation set of described from the cooperative multipoint transmission to the described terminal of participation send the message of instruction deexcitation cooperative multipoint transmission, comprising:

Send the message of instruction deexcitation cooperative multipoint transmission to described center cooperation point after, the method also comprises:

Described serving BS receive the described terminal that described center cooperation point sends identification information, not to described terminal transmission or the end position information not receiving the data of correct confirmation of described terminal, the start position information of described data and described data;

The identification information of described terminal, described data, the start position information of described data and the end position information of described data are preserved in described serving BS association.

8. method according to claim 7, it is characterized in that, if participate in other cooperative base station also comprised in the cooperation set of the cooperative multipoint transmission of described terminal outside described serving BS, other access network nodes in the cooperation set of described from the cooperative multipoint transmission to the described terminal of participation send the message of instruction deexcitation cooperative multipoint transmission, also comprise:

9. the method according to any one of claim 1 ~ 6, it is characterized in that, if the cooperation set participating in the cooperative multipoint transmission of described terminal comprises other cooperative base station outside described serving BS, but do not comprise center cooperation point, other access network nodes in the cooperation set of described from the cooperative multipoint transmission to the described terminal of participation send the message of instruction deexcitation cooperative multipoint transmission, comprising:

After sending the message of instruction deexcitation cooperative multipoint transmission to other cooperative base station in described cooperation set, the method also comprises:

Described serving BS receive the described terminal that other cooperative base station described send identification information, not to described terminal transmission or the end position information not receiving the data of correct confirmation of described terminal, the start position information of described data and described data;

10. the cooperative multipoint transmission control method in cell switch process, is characterized in that, comprising:

Access network node outside Terminal Service base station described in the cooperation set of the cooperative multipoint transmission of participation terminal receives the message of instruction deexcitation cooperative multipoint transmission, carries the identification information of described terminal and the indication information of deexcitation cooperative multipoint transmission in the message of described instruction deexcitation multicast communication; Described access network node determines described terminal according to the identification information of described terminal, and the instruction of indication information according to described deexcitation cooperative multipoint transmission, the cooperative multipoint transmission of terminal described in deexcitation; Or,

Described access network node receives handoff notification message, carries the identification information of described terminal, the identification information of described target BS and cooperative multipoint transmission and maintain indication information in described handoff notification message; Described access network node determines described terminal according to the identification information of described terminal, described target BS is determined according to the identification information of described target BS, and maintain indication information according to described cooperative multipoint transmission, proceed cooperative multipoint transmission after determining described terminal switch to described target BS.

11. methods according to claim 10, is characterized in that, if described access network node is center cooperation point, also carry the identification information of the center cooperation point of described target BS place cooperation set in described handoff notification message.

12. methods according to claim 10 or 11, is characterized in that, if described access network node is center cooperation point, after proceeding cooperative multipoint transmission after determining described terminal switch to described target BS, the method also comprises:

13. methods according to claim 10, is characterized in that, if described access network node is center cooperation point, after the message of the instruction deexcitation cooperative multipoint transmission of the serving BS transmission of described access network node receiving terminal, the method also comprises:

Described center cooperation point is by the identification information of described terminal, the serving BS not sending to described terminal to described terminal transmission or the end position information that do not receive the data of correct confirmation of described terminal, the start position information of described data and described data;

If described access network node is other cooperative base station outside serving BS, after the message of the instruction deexcitation cooperative multipoint transmission of the serving BS transmission of described access network node receiving terminal, the method also comprises:

Other cooperative base station described are by the identification information of described terminal and the serving BS not sending to described terminal to described terminal transmission or the data of correct confirmation that do not receive described terminal; Or other cooperative base station described are by the identification information of described terminal, the serving BS not sending to described terminal to described terminal transmission or the end position information that do not receive the data of correct confirmation of described terminal, the start position information of described data and described data.

14. methods according to claim 13, is characterized in that, if described access network node is center cooperation point, after the message of the instruction deexcitation cooperative multipoint transmission of the serving BS transmission of described center cooperation point receiving terminal, the method also comprises:

Described center cooperation point sends the message of instruction deexcitation cooperative multipoint transmission to other cooperative base station outside serving BS in the cooperation set of the cooperative multipoint transmission of participation terminal, sends in the message of the described instruction deexcitation cooperative multipoint transmission of other cooperative base station described and carries the identification information of described terminal and the indication information of deexcitation cooperative multipoint transmission.

15. 1 kinds of base stations, described base station comprises:

It is characterized in that, described base station also comprises:

16. base stations according to claim 15, is characterized in that, when judging the cooperative multipoint transmission whether described target BS support described terminal, described cooperative multipoint transmission control module specifically for:

17. base stations according to claim 16, is characterized in that, when judging the cooperative multipoint transmission whether described target BS support described terminal, described cooperative multipoint transmission control module specifically for:

18. base stations according to claim 17, it is characterized in that, if whether described target BS supports the identification information indication information of the cooperative multipoint transmission of described terminal being indicated to the cooperative multipoint transmission of described target BS Support center scheduling method and the center cooperation point of described target BS place cooperation set, and scheduling method centered by the cooperative multipoint transmission of described terminal, when described cooperative multipoint transmission control module sends handoff notification message to other access network nodes in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, specifically for:

19. base stations according to claim 18, is characterized in that, to participate in described terminal cooperative multipoint transmission cooperation set in center cooperation point send handoff notification message time, described cooperative multipoint transmission control module specifically for:

20. base stations according to claim 17, it is characterized in that, after described cell switch determining module determines to carry out cell merge to described terminal, before described cooperative multipoint transmission control module judges the cooperative multipoint transmission whether described target BS is supported described terminal, described cooperative multipoint transmission control module also for:

21. base stations according to any one of claim 16 ~ 20, it is characterized in that, if the cooperation set participating in the cooperative multipoint transmission of described terminal comprises center cooperation point, when described cooperative multipoint transmission control module sends the message of instruction deexcitation cooperative multipoint transmission to other access network nodes in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, specifically for:

22. base stations according to claim 21, it is characterized in that, if participate in other cooperative base station also comprised in the cooperation set of the cooperative multipoint transmission of described terminal outside described base station, described cooperative multipoint transmission control module to participate in described terminal cooperative multipoint transmission cooperation set in other access network nodes send the message of instruction deexcitation cooperative multipoint transmission time, also for:

23. base stations according to any one of claim 16 ~ 20, it is characterized in that, if the cooperation set participating in the cooperative multipoint transmission of described terminal comprises other cooperative base station outside described base station, but do not comprise center cooperation point, when described cooperative multipoint transmission sends the message of instruction deexcitation cooperative multipoint transmission to other access network nodes in the cooperation set of the cooperative multipoint transmission of the described terminal of participation, specifically for:

24. 1 kinds of access network nodes, is characterized in that, described access network node be the cooperative multipoint transmission of participation terminal cooperation set described in access network node outside Terminal Service base station, this access network node comprises:

25. access network nodes according to claim 24, is characterized in that, if described access network node is center cooperation point, also carry the identification information of the center cooperation point of described target BS place cooperation set in described handoff notification message.

26. access network nodes according to claim 24 or 25, it is characterized in that, if described access network node is center cooperation point, after described cooperative multipoint transmission maintains and proceeds cooperative multipoint transmission after module determines described terminal switch to described target BS, also for:

27. access network nodes according to claim 24, is characterized in that, if described access network node is center cooperation point, also comprise the first data transmission blocks;

28. access network nodes according to claim 27, is characterized in that, if described access network node is center cooperation point, also comprise cooperative multipoint transmission instruction sending module;