CN102246555B

CN102246555B - Method, base station and relay node for processing handover

Info

Publication number: CN102246555B
Application number: CN200980149442XA
Authority: CN
Inventors: 常俊仁; 李亚娟; 张亮亮
Original assignee: Huawei Technologies Co Ltd
Current assignee: Liang Aishan; Tang Guoyan
Priority date: 2009-05-07
Filing date: 2009-05-07
Publication date: 2013-12-04
Anticipated expiration: 2029-05-07
Also published as: WO2010127493A1; CN102246555A

Abstract

A method, base station and relay node for processing handover are provided by the embodiments of the present invention, relating to field of communications. In order to save radio resources during the handover procedure, the technical solution provided by the embodiment of the present invention includes: the elimination of the data packets of the user equipment in the cache is stopped, when a determination is made that the user equipment needs a handover, or at an appointed time after the determination; the receiving state information of the user equipment is acquired from the source relay node; the lost data packets are acquired from the source relay node according to the receiving state information, when the existence of the lost data packets is determined according to the receiving state information. The technical solution provided by the embodiment of the present invention can be applied to the communication systems handover.

Description

Switching handling method, base station and via node

Technical field

The present invention relates to the communications field, relate in particular to a kind of switching handling method, base station and via node.

Background technology

At existing LTE (Long Term Evolution, Long Term Evolution) in system, in handoff procedure, can process downlink data packet by least following two kinds of modes: for RLC (Radio Link Control, wireless link is controlled) affirmation mode, current access UE (User Equipment, subscriber equipment) eNB (Evolved Node B, evolution base station) is according to the order of sequence by all eNB that by the correct downlink data packet that receive of UE and sequence number thereof, are not transmitted to UE to be accessed; For the RLC Unacknowledged Mode, the downlink data packet that the eNB of current access UE only will not send to UE is transmitted to the eNB of UE to be accessed.In addition, in handoff procedure, for RLC affirmation mode or RLC Unacknowledged Mode, the upstream data bag that the eNB of current access UE all can receive all successes sends to S-GW (Serving Gateway gateway).

In order to improve the data throughout of Cell Edge User, simultaneously also in order to enlarge the community area coverage, introduced RN (Relay Node, via node) in LTE-A (Long Term Evolution Advanced, the further enhancing of long evolving system) system.The ARQ adopted in the described system of introducing RN (Automatic Repeat Request, HARQ) mechanism mainly is divided into two kinds: end-to-end mechanism, hop-by-hop mechanism.While adopting end-to-end mechanism transmission, the eNB buffer memory is from S-GW (Serving Gateway, gateway) after the packet received, give corresponding RN by this Packet Generation, when this eNB receives the confirmation information by the UE feedback of this RN forwarding, while confirming that this packet has correctly been received by UE, this eNB just removes this packet from buffer memory.Yet, because will waiting until the confirmation message that UE reports always, eNB just removes buffer memory, and therefore, when eNB serves a plurality of RN, the buffer memory that eNB takies is excessive.

For overcoming the problems referred to above, a kind of transmission technology of hop-by-hop mechanism is adopted.When adopting the transmission of hop-by-hop mechanism, the packet that the eNB buffer memory receives from S-GW, by this Packet Generation, give corresponding RN, when this eNB confirms that this packet has correctly been received by this RN, this eNB just removes this packet from buffer memory.Therefore, eNB does not need to wait the feedback acknowledgment information of UE and takies too much buffer memory.

In realizing process of the present invention, the inventor finds that in prior art, at least there are the following problems: while adopting the transmission of hop-by-hop mechanism, when UE is switched to the eNB of this RN or other destination node from a RN, the packet that mails to RN due to described eNB may be removed by eNB, the packet that RN need to send eNB return to eNB in case loss of data, and this passback process can be wasted the Radio Resource between RN and eNB.

Summary of the invention

Embodiments of the invention provide a kind of switching handling method, base station and via node, can in handoff procedure, save Radio Resource.

For achieving the above object, embodiments of the invention adopt following technical scheme:

A kind of switching handling method comprises:

When definite subscriber equipment need to switch, or, in the appointment moment of determining after described subscriber equipment need to switch, stop removing the packet of subscriber equipment described in buffer memory;

Obtain the receiving status information of described subscriber equipment from described source via node;

When according to described receiving status information, determining the packet that has loss, obtain the packet of described loss from described source via node according to described receiving status information.

A kind of base station comprises:

Whether the switching determining unit, need switching for determining subscriber equipment;

Stop clearing cell, for when described switching determining unit determines that described subscriber equipment need to switch, or determine the appointment moment after described subscriber equipment need to switch in described switching determining unit, stop removing the packet of subscriber equipment described in buffer memory;

Information acquisition unit, for obtaining the receiving status information of described subscriber equipment from described source via node;

The obliterated data determining unit, determine whether to exist for the receiving status information obtained according to described information acquisition unit the packet of losing;

The obliterated data acquiring unit, while for determining in described obliterated data determining unit, having the packet of losing, obtain the packet of described loss from described source via node according to described receiving status information.

A kind of switching handling method comprises:

Send the receiving status information of subscriber equipment to the source evolution base station;

When receiving the packet loss message sent by described source evolution base station, send the packet of losing to described source evolution base station according to described packet loss message.

A kind of via node comprises:

The state information transmitting element, for sending the receiving status information of subscriber equipment to the source evolution base station;

Packet loss message sink unit, for receiving the packet loss message sent by described source evolution base station;

The obliterated data transmitting element, when in described packet loss message sink unit, receiving packet loss message, send the packet of losing to described source evolution base station according to described packet loss message.

The switching handling method that the embodiment of the present invention provides, base station and via node, by the source evolution base station when definite subscriber equipment need to switch, perhaps in the appointment moment of determining after described subscriber equipment need to switch, stop removing the packet of the described subscriber equipment received by the source via node in buffer memory, and obtain the receiving status information of described subscriber equipment from the source via node, when according to described receiving status information, determining the packet that has loss, obtain the packet of loss from described source via node according to described receiving status information, reduce the possibility of source evolution base station lost data packets in handoff procedure, minimizing source via node returns to the bag quantity that clears data of source evolution base station, save Radio Resource.

The accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, in below describing embodiment, the accompanying drawing of required use is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

The schematic flow sheet of a kind of switching handling method that Fig. 1 provides for the embodiment of the present invention;

The schematic flow sheet of a kind of switching handling method that Fig. 2 provides when the situation 1 for the embodiment of the present invention;

The schematic flow sheet of a kind of switching handling method that Fig. 3 provides when the situation 2 for the embodiment of the present invention;

The schematic flow sheet of a kind of switching handling method that Fig. 4 provides when the situation 3 for the embodiment of the present invention;

The schematic flow sheet of a kind of switching handling method that Fig. 5 provides when the situation 4 for the embodiment of the present invention;

The schematic flow sheet of a kind of switching handling method that Fig. 6 provides when the situation 5 for the embodiment of the present invention;

The schematic flow sheet of a kind of switching handling method that Fig. 7 provides when the situation 6 for the embodiment of the present invention;

The schematic flow sheet of a kind of switching handling method that Fig. 8 provides when the situation 7 for the embodiment of the present invention;

The schematic flow sheet of a kind of switching handling method that Fig. 9 provides when the situation 8 for the embodiment of the present invention;

The schematic flow sheet of the another kind of switching handling method that Figure 10 provides when the situation 2 for the embodiment of the present invention;

The schematic flow sheet of the another kind of switching handling method that Figure 11 provides when the situation 3 for the embodiment of the present invention;

The schematic flow sheet of the another kind of switching handling method that Figure 12 provides when the situation 4 for the embodiment of the present invention;

The schematic flow sheet of the another kind of switching handling method that Figure 13 provides for the embodiment of the present invention;

The formation schematic diagram of a kind of base station that Figure 14 provides for the embodiment of the present invention;

The formation schematic diagram of a kind of via node that Figure 15 provides for the embodiment of the present invention;

The formation schematic diagram of a kind of switching processing system that Figure 16 provides for the embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.

In order to save the RN that uses in handoff procedure and the Radio Resource between eNB, the embodiment of the present invention provides a kind of switching handling method, and as shown in Figure 1, embodiment of the present invention switching handling method comprises:

101, the source evolution base station be when definite subscriber equipment need to switch, or determining that appointment after described subscriber equipment need to switch constantly, stops removing the packet of subscriber equipment described in buffer memory.

At this, several concepts of using are in embodiments of the present invention done and described, wherein, source via node (source relay node, S-RN) refers to the via node of the front subscriber equipment access of switching; What source evolution base station (source eNB, S-eNB) referred to source via node that subscriber equipment accesses authorizes (donor) evolution base station; And the target via node mentioned in the following description (Target relay node, T-RN) refers to the via node of the rear subscriber equipment access of switching; Target evolution base station (Target eNB, T-eNB) refers to the evolution base station of subscriber equipment access after switching, or the target via node that after switching, subscriber equipment accesses authorize (donor) evolution base station.

In addition, the source evolution base station can also stop sending to described source via node the packet of described subscriber equipment.

102, the source evolution base station obtains the receiving status information of described subscriber equipment from the source via node.

The source via node can send receiving state report to the source evolution base station, and the source evolution base station obtains the receiving status information of described subscriber equipment from the receiving state report received.Perhaps, the source via node also can carry receiving status information in the handover request sent to the source evolution base station, and the source evolution base station obtains the receiving status information of described subscriber equipment from the handover request received.

103, the source evolution base station, when according to described receiving status information, determining the packet that has loss, obtains the packet of loss from described source via node according to described receiving status information.

The source evolution base station can also send according to described receiving status information the accepting state message of packet and/or the described subscriber equipment of described subscriber equipment to described destination node.

The switching handling method that the embodiment of the present invention provides, by the source evolution base station when definite subscriber equipment need to switch, perhaps in the appointment moment of determining after described subscriber equipment need to switch, stop removing the packet of the described subscriber equipment received by the source via node in buffer memory, and obtain the receiving status information of described subscriber equipment from the source via node, when according to described receiving status information, determining the packet that has loss, obtain the packet of loss from described source via node according to described receiving status information, reduce the possibility of source evolution base station lost data packets in handoff procedure, minimizing source via node returns to the bag quantity that clears data of source evolution base station, save Radio Resource.

In the above-described embodiments, UE is switched to destination node from S-RN and mainly can be divided into following four kinds of situations: UE is switched to S-eNB from S-RN; UE is switched to T-eNB from S-RN; UE is switched to the T-RN of access T-eNB from S-RN; UE is switched to the T-RN of access S-eNB from S-RN.In addition, the decision of UE switching can be made by S-RN, also the decision of UE switching can be made by S-eNB.Below in conjunction with above-mentioned different situations, above-described embodiment is described in further detail.

Situation one, made the decision of UE switching by S-RN, UE is switched to S-eNB from S-RN

As shown in Figure 2, embodiment of the present invention switching handling method comprises:

201, UE sends measurement report to the source via node, and the source via node is made the switching decision according to measurement report and other wireless resource information, and selecting the source evolution base station is destination node.

202, the source via node sends handover request, the contextual information that this handover request comprises UE etc. to the source evolution base station.For example, this handover request can realize transmission by the message mode that uses X2 interface, also can realize transmission by adopting the RRC message mode.

203, after the source evolution base station receives this handover request, after determining that according to described handover request destination node is the source evolution base station, carry out access control, if determine and allow described subscriber equipment access according to described access control result, the source evolution base station stops removing the packet of subscriber equipment described in buffer memory, and stops sending to described source via node the packet of described subscriber equipment.

S-eNB can resolve this handover request after receiving the handover request sent by S-RN, obtains the information that destination node is S-eNB from this handover request.In addition, this handover request can also be carried destination address, and S-eNB, after receiving the handover request sent by S-RN, judges that the destination address of this handover request is self, resolves this handover request, obtains the information that destination node is S-eNB from this handover request.

In embodiments of the present invention, S-eNB stops removing the packet of UE described in buffer memory, S-eNB no matter its packet that mails to the UE of S-RN whether be correctly received, these the packet of buffer memory all no longer removed.Particularly, can be that S-eNB determines the moment that UE need to switch the zero hour that S-eNB stops removing the packet of UE described in buffer memory, can be also S-eNB determine that UE need to switch the time be carved into S-eNB and stop sending any time between moment of packet to S-RN, can also be the moment that S-eNB stops sending to S-RN packet.In addition, if S-eNB only stops removing the packet of the UE in buffer memory, do not stop sending packet to S-RN, S-eNB stop removing the zero hour of the packet of UE described in buffer memory can be S-eNB determine that described UE need to switch the time be carved into S-eNB and determine that described UE is allowed to any time between moment of switching, can be also that S-eNB determines that described UE is allowed to the moment of switching.

In situation one, S-eNB at least can stop sending to S-RN in following several moment the packet of described UE:

As aftermentioned S-eNB to the packet that stops sending to S-RN described UE after S-RN sends Handover Request Acknowledge;

Perhaps S-eNB also can stop sending to S-RN the packet of described UE when determining permission UE access;

S-eNB stops sending to S-RN the packet of described UE when perhaps also can lag behind a period of time T in the moment than determining permission UE access.

Can be also perhaps that S-RN sends switching command (or being referred to as to connect reconfiguration message with the RRC of mobility control information), by first, the sequence number from the new packet still also do not sent to UE received of S-eNB sends to S-eNB to S-RN; When S-eNB receives this sequence number information, stop sending to S-RN the packet of UE.

Perhaps S-RN can directly stop transfer request message to one of S-eNB transmission, and request S-eNB stops transmitting to S-RN the data of this UE.After receiving this message, S-eNB stops sending to S-RN the packet of this UE.

Can be also perhaps that S-eNB stops transfer request message to one of S-RN transmission, then S-RN sends an acknowledge message to S-eNB, stops sending to S-RN the packet of this UE after S-eNB receives this acknowledge message.

Can be also perhaps to stop sending to S-RN the packet of this UE when S-eNB receives the receiving state report of the UE that aftermentioned S-RN sends.

204, the source evolution base station sends Handover Request Acknowledge to the source via node.

205,, after the source via node receives the Handover Request Acknowledge sent by the source evolution base station, send the receiving state report of described subscriber equipment to the source evolution base station.

Particularly, S-RN can just stop sending packet and sending the receiving state report of this UE to S-eNB to UE when receiving Handover Request Acknowledge, also can send packet and send the receiving state report of this UE to S-eNB to UE stopping when UE sends switching command.In addition, S-eNB also can, when step 202 sends handover request, send to S-eNB by the receiving state report of described UE.

In embodiments of the present invention, the content of described receiving state report is under RLC affirmation mode and RLC Unacknowledged Mode, different:

For the RLC affirmation mode:

Described receiving state report can comprise that S-RN is to the sequence number of the last one or more new packet sent of UE and the accepting state of this packet, and the sequence number of by UE, not confirmed the correct packet received.Perhaps, described receiving state report also can comprise the sequence number of the one or more new packet that S-RN does not send at first to UE, and the sequence number of by UE, not confirmed the correct packet received.Perhaps, described receiving state report also can not carry the sequence number of by UE, not confirmed the correct packet received, and carries the sequence number of by UE, being confirmed the correct packet received.

In addition, described receiving state report can be a piece of news, can be also other forms, for example, S-RN sends one or more special terminating point packet to S-eNB, this terminating point packet comprises the sequence number of S-RN to the one or more new packet of the last transmission of UE, and this terminating point packet means current S-RN from which packet starts to stop to send data to UE.And, before S-RN comprises the termination packet that S-RN sends to UE in the status report sent to S-eNB and comprise these terminations data in wrapping in, by UE, confirmed the correctly sequence number of the packet of reception.

For the RLC Unacknowledged Mode:

Described receiving state report can comprise the sequence number of the one or more new packet that S-RN finally sends to UE or the sequence number of the one or more new packet that S-RN does not send at first to UE.

The sequence number of the packet of mentioning in the embodiment of the present invention, can be PDCP SDU (Packet Data Convergence Protocol Service Data Unit, the PDCP Service Data Unit) sequence number, perhaps RLC SDU (Radio Link Control Service Data Unit, wireless link service control data cell) sequence number, perhaps RLC PDU (Radio Link Control Protocol Data Unit, wireless link control protocol data cell) sequence number, it can be also the sequence number of the core network data bags such as RTP/UDP/IP/ESP.In addition, can be also a mapping table, in this mapping table, indicated not by the correct RLC PDU received of UE and the corresponding relation of the sequence number between other packets (as PDCP packet or core network data bag).

206,, after the source evolution base station receives described receiving state report, according to described receiving state report, remove redundant data bag in buffer memory.

In embodiments of the present invention, S-eNB, under RLC affirmation mode and RLC Unacknowledged Mode, determines the method difference of redundant data bag according to receiving state report:

For the RLC affirmation mode:

S-eNB can be according to S-RN to the sequence number of the last new packet sent of UE with not by the sequence number of the correct packet received of UE confirmation, and the sequence number of the packet of UE in buffer memory, before determining in buffer memory the sequence number of the packet that sequence number in the end sends, and not by UE, not confirmed the sequence number of the correct packet received, for by UE, being confirmed the correct packet received, using being removed as the redundant data bag by the correct packet received of UE confirmation of determining.Perhaps, the sequence number of the new packet that S-eNB can not send to UE at first according to S-RN yet and by UE, do not confirmed the sequence number of the packet of correct reception, and the sequence number of the packet of UE in buffer memory, determine and confirmed that by UE the correct packet received is also removed.

For the RLC Unacknowledged Mode:

The sequence number of the sequence number of the new packet that S-eNB can finally send to UE according to S-RN or the new packet do not sent at first, and the sequence number of the packet of UE in buffer memory, determine the packet sent to described UE in buffer memory, the packet sent to described UE of determining is removed as the redundant data bag.

207, the source evolution base station is when existing lost data packets according to described receiving state report is definite, determine the packet of losing according to described receiving state report, and sending packet loss message to described source via node, described packet loss message is carried the sequence number of the packet of described definite loss.

In embodiments of the present invention, S-eNB, under RLC affirmation mode and RLC Unacknowledged Mode, determines the method difference of the packet of losing according to receiving state report:

For the RLC affirmation mode:

The S-eNB basis is not by the sequence number of the packet of UE described in the sequence number of the correct packet received of UE confirmation and buffer memory, determine the non-existent packet of by described UE, being confirmed correct reception in buffer memory, using described definite packet correctly received by described UE confirmation as the packet of losing.Perhaps, S-eNB also can be according to by the sequence number of the packet of UE described in the sequence number of the correct packet received of UE confirmation and buffer memory, being determined the packet of losing.

For the RLC Unacknowledged Mode:

S-eNB is the sequence number to the last new packet sent of UE according to S-RN, and the sequence number of the packet of the described UE of buffer memory, determine the sequence number of the new packet that sequence number in the end sends and the packet between the sequence number of the packet of buffer memory at first, using described established data bag as the packet of losing.Perhaps, the sequence number of the new packet that S-eNB also can not send to UE at first according to S-RN, and the sequence number of the packet of the described UE of buffer memory, determine the packet of sequence number that sequence number is the new packet that do not send at first or the sequence number between the sequence number of the sequence number of the new packet do not sent at first and the packet of buffer memory at first, the packet using described established data bag as loss.

208, after the source via node receives described packet loss message, obtain the sequence number of the packet of loss from described packet loss message, according to the sequence number of the packet of described loss, send the packet of described loss to described source evolution base station.After the source evolution base station receives the packet of the described loss sent by described source via node, the packet of the described loss of buffer memory.

In addition, described subscriber equipment, after receiving the switching command sent by the source via node, is carried out the access to the source evolution base station.

Situation two, made the decision of UE switching by S-RN, UE is switched to T-eNB from S-RN

As shown in Figure 3, embodiment of the present invention switching handling method comprises:

301, UE sends measurement report to the source via node, and the source via node is made the switching decision according to measurement report and other wireless resource information, and the select target evolution base station is destination node.

Step 302 is with step 202.

303,, after the source evolution base station receives this handover request, determine that destination node is target evolution base station, is transmitted to target evolution base station by described handover request.

S-eNB can resolve this handover request after receiving the handover request sent by S-RN, obtains the information that destination node is T-eNB from this handover request, and described handover request is transmitted to T-eNB.

304,, after the handover request that target evolution base station reception sources evolution base station forwards, carry out access control.If the access control result is for allowing this subscriber equipment access, target evolution base station sends Handover Request Acknowledge to the source evolution base station.

305,, after the source evolution base station receives the Handover Request Acknowledge sent by described target evolution base station, according to described Handover Request Acknowledge, determine and allow described subscriber equipment access.The source evolution base station stops removing the packet of subscriber equipment described in buffer memory, and stops sending to described source via node the packet of described subscriber equipment.

In situation two, S-eNB at least can stop sending to S-RN in following several moment the packet of described UE:

As S-eNB to the packet that stops sending to S-RN this UE after S-RN forwards Handover Request Acknowledge.

Perhaps S-eNB also can stop sending to S-RN the packet of this UE when receiving the Handover Request Acknowledge that allows the UE access comprising of T-eNB transmission.

S-eNB stops sending to S-RN the packet of this UE when perhaps also can lag behind a period of time T in the moment than forward Handover Request Acknowledge to S-RN.

Can be also perhaps S-RN while sending switching command, S-RN can by first from S-eNB new receive but the sequence number of the packet also do not sent to UE send to S-eNB; When S-eNB receives this sequence number information, stop sending to S-RN the packet of this UE.

Perhaps S-RN can directly stop transfer request message to one of S-eNB transmission, and request S-eNB stops transmitting to S-RN the data of this UE.After receiving this message, S-eNB stops transmitting the data of this UE to S-RN.

Step 306～310 are with step 204～208.

311, the source evolution base station sends the packet of subscriber equipment described in buffer memory to target evolution base station; And/or send the accepting state message of described subscriber equipment to described target evolution base station.

S-eNB can, after receiving the lost data packets sent by S-RN, just send the packet of the described UE in buffer memory and the accepting state message of described UE to T-eNB.Perhaps, S-eNB also can be after UE successfully accesses T-eNB, send the packet of the described UE in buffer memory and the accepting state message of described UE to T-eNB, for example, after UE successfully accesses T-eNB, T-eNB sends data transfer request to S-eNB, after S-eNB receives described data transfer request, to T-eNB, sends the packet of the described UE in buffer memory and the accepting state message of described UE.

Particularly, the receiving state report of the UE that S-eNB can send according to S-RN, be not transmitted to T-eNB by all descending packets that correctly received by UE and the sequence number of these packets according to the order of sequence.In addition, S-eNB also can be by the new Packet Generation from the reception of S1 interface to T-eNB.

The receiving state report of this UE that S-eNB can receive from S-RN, be transmitted to T-eNB as accepting state message.Perhaps, S-eNB also can send a new accepting state message to T-eNB.In embodiments of the present invention, S-eNB is under RLC affirmation mode and RLC Unacknowledged Mode, and the content of the accepting state message sent to T-eNB is different:

For the RLC affirmation mode:

This accepting state message comprises that S-RN is to the sequence number of the last one or more new data packets that send of UE and the accepting state of this packet, or the sequence number of the one or more new packet that do not send at first to UE of S-RN.Perhaps, this accepting state message can comprise that T-eNB should be to first sequence number of new allocation of packets.

For the RLC Unacknowledged Mode:

This accepting state message comprises the sequence number of S-RN to the last one or more new data packets that send of UE, or the sequence number of the one or more new packet that do not send at first to UE of S-RN.

In step 303,305, S-eNB need to resolve handover request and Handover Request Acknowledge.In addition, S-eNB can also not resolve this handover request, and this handover request is passed through to target evolution base station.As shown in figure 10, embodiment of the present invention switching handling method comprises:

Step 1001 is with step 301.

1002, the source via node sends handover request, the contextual information that this handover request comprises UE, destination address etc. to the source evolution base station.For example, this handover request can realize transmission by the message mode that uses X2 interface, also can realize transmission by adopting the RRC message mode.

1003,, after the source evolution base station receives this handover request, the destination address of determining handover request is not the address of oneself, according to this destination address, described handover request is passed through to target evolution base station.

Step 1004 is with step 304.

1005, after the source evolution base station receives this Handover Request Acknowledge, this Handover Request Acknowledge is passed through to the source via node.

1006, after the source via node receives this Handover Request Acknowledge, to the source evolution base station, send switch indicating information.

1007,, after the source evolution base station receives described switch indicating information, according to described switch indicating information, determine and allow the subscriber equipment access.The source evolution base station stops removing the packet of subscriber equipment described in buffer memory, and stops sending to described source via node the packet of described subscriber equipment.

Step 1008～1012 are with step 307～311.

Situation three, made the decision of UE switching by S-RN, UE is switched to the T-RN of T-eNB from S-RN

As shown in Figure 4, embodiment of the present invention switching handling method comprises:

401, UE sends measurement report to the source via node, and the source via node is made the switching decision according to measurement report and other wireless resource information, and the target via node of select target evolution base station is destination node.

Step 402 is with step 302.

403, after the source evolution base station receives this handover request, determine the target via node that destination node is target evolution base station, described handover request is transmitted to target evolution base station.After the handover request that target evolution base station reception sources evolution base station forwards, described handover request is transmitted to the target via node.

S-eNB can resolve this handover request after receiving the handover request sent by S-RN, and obtaining destination node from this handover request is the information that is access in the T-RN of T-eNB, and described handover request is transmitted to T-RN.

404,, after the handover request that target via node receiving target evolution base station forwards, carry out access control.If the access control result is for allowing this subscriber equipment access, the target via node sends Handover Request Acknowledge to target evolution base station, and target evolution base station is transmitted to the source evolution base station by this Handover Request Acknowledge.

405,, after the source evolution base station receives this Handover Request Acknowledge, according to this Handover Request Acknowledge, determine and allow described subscriber equipment access.The source evolution base station stops removing the packet of subscriber equipment described in buffer memory, and stops sending to described source via node the packet of described subscriber equipment.

In situation three, S-eNB at least can stop sending to S-RN in following several moment the packet of described UE:

Can be also perhaps S-RN while sending switching command, S-RN can by first from S-eNB new receive but the sequence number of the packet also do not sent to UE send to S-eNB; When S-eNB receives this sequence number information, stop sending to S-RN the packet of UE.

Can be also perhaps to stop to S-RN transmission data when S-eNB receives the receiving state report of the UE that aftermentioned S-RN sends.

Step 406～411 are with step 306～311.

In addition, T-eNB can also be after sending Handover Request Acknowledge to S-eNB, send bi-casting/multicast request to MME (Mobility Management Entity, Mobility Management Entity), then MME sends the packet of current UE to the S-GW request to S-eNB and T-eNB bi-casting/multicast.After S-GW agrees to carry out bi-casting/multicast, to MME feedback bi-casting/multicast request, confirm.Then, MME feeds back bi-casting/multicast request confirmation to T-eNB.Perhaps, S-eNB, after the Handover Request Acknowledge that receives the T-eNB forwarding, sends bi-casting/multicast request to MME, and then MME sends the packet of current UE to the S-GW request to S-eNB and T-eNB bi-casting/multicast.After S-GW agrees to carry out bi-casting/multicast, to MME feedback bi-casting/multicast request, confirm.Then, MME feeds back bi-casting/multicast request confirmation to S-eNB.

After S-GW agrees to carry out bi-casting/multicast, to the packet of S-eNB and T-eNB bi-casting/multicast transmission UE.In step 411, S-eNB determines the packet of the UE sent by the S-GW clean culture in buffer memory according to bi-casting/multicast sign, under the RLC affirmation mode, do not forward and confirmed the correct packet sent by the S-GW clean culture received by UE to T-eNB, under the RLC Unacknowledged Mode, to T-eNB, forward the packet sent by the S-GW clean culture that S-RN does not send to UE.

S-eNB determines that according to bi-casting/multicast sign the mode of the packet of the UE sent by the S-GW clean culture in buffer memory has a variety of.For example, add bi-casting/multicast sign on the packet that S-GW can send in each bi-casting/multicast, therefore, S-eNB can determine the packet that does not carry bi-casting/multicast sign in the packet of this UE of buffer memory, is the packet of this UE of being sent by the S-GW clean culture.Perhaps, add bi-casting/multicast sign on the packet that S-GW also can send in first bi-casting/multicast, therefore, S-eNB can determine the packet of sequence number before the sequence number of the packet that carries bi-casting/multicast sign in the packet of this UE of buffer memory, is the packet of this UE of being sent by the S-GW clean culture.

In step 403,405, S-eNB need to resolve handover request and Handover Request Acknowledge.In addition, S-eNB can also not resolve this handover request, this handover request is passed through to the target via node of target evolution base station.As shown in figure 11, embodiment of the present invention switching handling method comprises:

Step 1101 is with step 401.

1102, the source via node sends handover request, the contextual information that this handover request comprises UE, destination address etc. to the source evolution base station.For example, this handover request can realize transmission by the message mode that uses X2 interface, also can realize transmission by adopting the RRC message mode.

1103, after the source evolution base station receives this handover request, the destination address of determining handover request is not the address of oneself, according to this destination address, described handover request is passed through to the target via node of target evolution base station.

1104,, after the target via node receives this handover request, carry out access control.If the access control result is for allowing this subscriber equipment access, the target via node sends Handover Request Acknowledge to the source evolution base station.

1105, after the source evolution base station receives this Handover Request Acknowledge, this Handover Request Acknowledge is passed through to the source via node.

1106, after the source via node receives this Handover Request Acknowledge, to the source evolution base station, send switch indicating information.

1107,, after the source evolution base station receives described switch indicating information, according to described switch indicating information, determine and allow the subscriber equipment access.The source evolution base station stops removing the packet of subscriber equipment described in buffer memory, and stops sending to described source via node the packet of described subscriber equipment.

Step 1108～1112 are with step 407～411.

Situation four, made the decision of UE switching by S-RN, UE is switched to the T-RN of S-eNB from S-RN

As shown in Figure 5, embodiment of the present invention switching handling method comprises:

501, UE sends measurement report to the source via node, and the source via node is made the switching decision according to measurement report and other wireless resource information, and selecting the target via node of source evolution base station is destination node.

Step 502 is with step 202.

503, after the source evolution base station receives this handover request, determine the target via node that destination node is the source evolution base station, described handover request is transmitted to the target via node.

504,, after the handover request that target via node reception sources evolution base station forwards, carry out access control.If the access control result is for allowing this subscriber equipment access, the target via node sends Handover Request Acknowledge to the source evolution base station.

505,, after the source evolution base station receives this Handover Request Acknowledge, according to this Handover Request Acknowledge, determine and allow described subscriber equipment access.The source evolution base station stops removing the packet of subscriber equipment described in buffer memory, and stops sending to described source via node the packet of described subscriber equipment.

In situation four, S-eNB at least can stop sending to S-RN in following several moment the packet of described UE:

Perhaps S-eNB also can stop sending to S-RN the packet of this UE when receiving the Handover Request Acknowledge that allows the UE access comprising of T-RN transmission.

Perhaps S-eNB also can the moment than forward Handover Request Acknowledge to S-RN in advance or stop sending to S-RN the packet of this UE while lagging behind a period of time T.

Step 506～510 are with step 204～208.

511, the source evolution base station sends the packet of subscriber equipment described in buffer memory to the target via node, and/or sends the accepting state message of described subscriber equipment to described target via node.

The specific implementation that S-eNB sends the accepting state message of the packet of UE and UE to T-RN can, referring to step 301, not repeat them here.

In step 503,505, S-eNB need to resolve handover request and Handover Request Acknowledge.In addition, S-eNB can also not resolve this handover request, and this handover request is passed through to the target relay point.As shown in figure 12, embodiment of the present invention switching handling method comprises:

Step 1201 is with step 501.

1202, the source via node sends handover request, the contextual information that this handover request comprises UE, destination address etc. to the source evolution base station.For example, this handover request can realize transmission by the message mode that uses X2 interface, also can realize transmission by adopting the RRC message mode.

1203, after the source evolution base station receives this handover request, the destination address of determining handover request is not the address of oneself, according to this destination address, described handover request is passed through to the target via node that is access in the source evolution base station.

Step 1204 is with step 504.

1205, after the source evolution base station receives this Handover Request Acknowledge, this Handover Request Acknowledge is passed through to the source via node.

1206, after the source via node receives this Handover Request Acknowledge, to the source evolution base station, send switch indicating information.

1207,, after the source evolution base station receives described switch indicating information, according to described switch indicating information, determine and allow the subscriber equipment access.The source evolution base station stops removing the packet of subscriber equipment described in buffer memory, and stops sending to described source via node the packet of described subscriber equipment.

Step 1208～1212 are with step 507～511.

Situation five, made the decision of UE switching by S-eNB, UE is switched to S-eNB from S-RN

As shown in Figure 6, embodiment of the present invention switching handling method comprises:

601, subscriber equipment sends measurement report to the source via node, and the measurement report that the source via node sends described subscriber equipment is transmitted to the source evolution base station.For example, this measurement report can forward by the message mode that uses X2 interface, also can forward by adopting the RRC message mode.

602, after the source evolution base station receives this measurement report, according to this measurement report and other wireless resource information, make the switching decision, selecting oneself is destination node.Carry out access control, if determine and allow described subscriber equipment access according to described access control result, the source evolution base station stops removing the packet of subscriber equipment described in buffer memory, and stops sending to described source via node the packet of described subscriber equipment.

In situation five, S-eNB at least can stop sending to S-RN in following several moment the packet of described UE:

Send after switching command (or being referred to as to connect reconfiguration message with the RRC of mobility control information) packet that stops sending to S-RN this UE to S-RN as S-eNB.

When shifting to an earlier date or lag behind a period of time T, the moment than send switching command to S-RN stops sending to S-RN the packet of this UE as S-eNB.

Perhaps S-eNB also can stop sending to S-RN the packet of this UE when determining to allow switching.

Perhaps S-eNB also can stop sending to S-RN the packet of this UE when the moment that allows switching than decision shifts to an earlier date or lags behind a period of time T.

Can be also perhaps to stop sending to S-eNB the packet of this UE when S-eNB receives the receiving state report of the UE that aftermentioned S-RN sends.

603, the source evolution base station sends switching command to the source via node.

604,, after the source via node receives the switching command sent by the source evolution base station, send the receiving state report of described subscriber equipment to the source evolution base station.

S-RN sends the specific implementation of the receiving state report of UE to S-eNB can refer step 205, does not repeat them here.

Step 605～607 are with step 206～208.

Situation six, made the decision of UE switching by S-eNB, UE is switched to T-eNB from S-RN

As shown in Figure 7, embodiment of the present invention switching handling method comprises:

Step 701 is with step 601.

702, after the source evolution base station receives this measurement report, according to this measurement report and other wireless resource information, make the switching decision, the select target evolution base station is destination node, and sends handover request to target evolution base station.

703,, after target evolution base station receives this handover request, carry out access control.If the access control result is for allowing this subscriber equipment access, target evolution base station sends Handover Request Acknowledge to the source evolution base station.

704,, after the source evolution base station receives the Handover Request Acknowledge sent by target evolution base station, according to described Handover Request Acknowledge, determine and allow described subscriber equipment access.The source evolution base station stops removing the packet of subscriber equipment described in buffer memory, and stops sending to described source via node the packet of described subscriber equipment.

In situation six, S-eNB at least can stop sending to S-RN in following several moment the packet of described UE:

As S-eNB to the packet that stops sending to S-RN this UE after S-RN sends switching command.

Step 705～706 are with step 603～604.

Step 707～710 are with step 308～311.

Situation seven, made the decision of UE switching by S-eNB, UE is switched to the T-RN of T-eNB from S-RN

As shown in Figure 8, embodiment of the present invention switching handling method comprises:

Step 801 is with step 601.

802, after the source evolution base station receives this measurement report, make the switching decision according to this measurement report and other wireless resource information, the target via node of select target evolution base station is destination node, and sending handover request to target evolution base station, target evolution base station is transmitted to the target via node by this handover request.

803,, after the handover request that target via node receiving target evolution base station forwards, carry out access control.If the access control result is for allowing this subscriber equipment access, the target via node sends Handover Request Acknowledge to target evolution base station, and target evolution base station is transmitted to the source evolution base station by this Handover Request Acknowledge.

804,, after the source evolution base station receives this Handover Request Acknowledge, according to this Handover Request Acknowledge, determine and allow described subscriber equipment access.The source evolution base station stops removing the packet of subscriber equipment described in buffer memory, and stops sending to described source via node the packet of described subscriber equipment.

In situation seven, S-eNB at least can stop sending to S-RN in following several moment the packet of described UE:

Step 805～806 are with step 603～604.

Step 807～810 are with step 408～411.

In addition, all right T-eNB is after sending Handover Request Acknowledge to S-eNB, by MME, ask S-GW to send the packet of UE to S-eNB and T-eNB bi-casting/multicast, perhaps, also can in reception, after the Handover Request Acknowledge by the T-eNB transmission, by MME, ask S-GW to send the packet of UE to S-eNB and T-eNB bi-casting/multicast by S-eNB.S-eNB forwards not by UE and confirms correct the reception to T-eNB, or the packet sent by the S-GW clean culture that do not send to UE of S-RN.Specific implementation is described in detail in situation three, therefore repeats no more.

Situation eight, made the decision of UE switching by S-eNB, UE is switched to the T-RN of S-eNB from S-RN

As shown in Figure 9, embodiment of the present invention switching handling method comprises:

Step 901 is with step 601.

902, after the source evolution base station receives this measurement report, according to this measurement report and other wireless resource information, make the switching decision, selecting the target via node of source evolution base station is destination node, and sends handover request to the target via node.

903,, after the handover request that target via node reception sources evolution base station sends, carry out access control.If the access control result is for allowing this subscriber equipment access, the target via node sends Handover Request Acknowledge to the source evolution base station.

904,, after the source evolution base station receives this Handover Request Acknowledge, according to this Handover Request Acknowledge, determine and allow described subscriber equipment access.The source evolution base station stops removing the packet of subscriber equipment described in buffer memory, and stops sending to described S-eNB the packet of described subscriber equipment.

In situation eight, S-eNB at least can stop sending to S-RN in following several moment the packet of described UE:

Perhaps S-eNB also can the moment than send switching command to S-RN in advance or stop sending to S-RN the packet of this UE while lagging behind a period of time T.

Step 905～906 are with step 603～604.

Step 907～910 are with step 508～511.

In addition, in situation three, situation seven times, send the packet of current subscriber equipment by source evolution base station or target evolution base station request S-GW bi-casting/multicast, make target evolution base station can directly from S-GW, receive the packet of current subscriber equipment, by this package forward to the target via node, not only reduced the time delay of transfer of data, also made target evolution base station more easily packet be sorted.

With said method correspondingly, the embodiment of the present invention also provides a kind of switching handling method, as shown in figure 13, embodiment of the present invention switching handling method comprises:

1301, the source via node sends the receiving status information of subscriber equipment to the source evolution base station;

1302, the source via node, when receiving the packet loss message sent by described source evolution base station, sends the packet of losing to described source evolution base station according to described packet loss message.

The switching handling method that the embodiment of the present invention provides, the source via node sends to the source evolution base station by the receiving status information of subscriber equipment, make the source evolution base station after the packet that stops removing subscriber equipment described in buffer memory, can determine whether to exist lost data packets according to the receiving status information of subscriber equipment, the packet loss message that the source via node sends according to the source evolution base station sends packet to the source evolution base station, reduce the possibility of source evolution base station lost data packets in handoff procedure, minimizing source via node returns to the bag quantity that clears data of source evolution base station, save Radio Resource.

With said method accordingly, the invention provides a kind of base station, as shown in figure 14, embodiment of the present invention base station comprises:

Whether switching determining unit 1401, need switching for determining subscriber equipment;

Stop clearing cell 1402, for when described switching determining unit 1401 determines that described subscriber equipment need to switch, or determine the appointment moment after described subscriber equipment need to switch in described switching determining unit 1401, stop removing the packet of subscriber equipment described in buffer memory;

Information acquisition unit 1403, for obtaining the receiving status information of described subscriber equipment from the source via node;

Obliterated data determining unit 1404, determine whether to exist for the receiving status information obtained according to described information acquisition unit 1403 packet of losing;

Obliterated data acquiring unit 1405, while for determining in described obliterated data determining unit 1404, having the packet of losing, the receiving status information obtained according to described information acquisition unit 1403 obtains the packet of described loss from described source via node.

Further, described switching determining unit 1401 specifically comprises:

Handover request receives subelement, for receiving the handover request sent by described source via node;

The handover request judgment sub-unit, determine that for the handover request that receives the subelement reception according to described handover request described subscriber equipment needs switching;

Perhaps, described switching determining unit 1401 specifically comprises:

Measurement report receives subelement, for receiving the measurement report of the described subscriber equipment sent by described source via node;

The measurement report judgment sub-unit, determine that for the measurement report that receives the subelement reception according to described measurement report described subscriber equipment needs switching.

Further, described information acquisition unit 1403 comprises:

Status report receives subelement, for receiving the receiving state report sent by described source via node;

The state information acquisition subelement, obtain the receiving status information of described subscriber equipment for receive receiving state report that subelement receives from described status report.

Further, described obliterated data acquiring unit 1405 comprises:

Obliterated data is determined subelement, for determine the packet of losing according to described receiving status information;

Packet loss message sends subelement, and for to described source via node, sending packet loss message, described packet loss message is carried the sequence number that described obliterated data is determined the packet of the loss that subelement is definite;

Obliterated data receives subelement, for receiving the packet of the described loss sent by described source via node.

Further, described base station also comprises:

The redundant data determining unit, determine whether to exist unnecessary packet for the receiving status information obtained according to described information acquisition unit;

The buffer memory clearing cell, while for determining in described redundant data determining unit, having unnecessary packet, the receiving status information obtained according to described information acquisition unit is removed unnecessary packet described in buffer memory.

Further, described base station also comprises:

Data transmission unit, send the packet of described subscriber equipment for the receiving status information obtained according to described information acquisition unit to destination node;

The status message transmitting element, send the accepting state message of described subscriber equipment for the receiving status information obtained according to described information acquisition unit to described destination node.

Further, described base station also comprises the transmission request reception unit, for receiving the data transfer request sent by described destination node.The data transmission unit of described base station and status message transmitting element can, according to the data transfer request of described transmission request reception unit reception, send respectively the accepting state message of packet and the described subscriber equipment of described subscriber equipment to destination node.

Further, described data transmission unit specifically comprises:

Unicast data is determined subelement, for determine clean culture according to bi-casting/multicast sign, sends packet;

Transmission data subelement, do not send and confirmed that by described subscriber equipment the correct clean culture that receives or do not send to described subscriber equipment sends packet to described destination node for the receiving status information obtained according to described information acquisition unit.

Further, described base station also comprises:

Send request transmitting element, for by Mobility Management Entity, to gateway, sending bi-casting/multicast request, described bi-casting/multicast request is for asking described gateway to send packet to target evolution base station and source evolution base station bi-casting/multicast;

Send and confirm receiving element, the bi-casting forwarded by described Mobility Management Entity for reception/multicast request is confirmed;

The new data receiving element, for receiving the packet sent by described gateway bi-casting/multicast.

The base station that the embodiment of the present invention provides, by when definite subscriber equipment need to switch, perhaps in the appointment moment of determining after described subscriber equipment need to switch, stop removing the packet of the described subscriber equipment received by the source via node in buffer memory, and obtain the receiving status information of described subscriber equipment from the source via node, when according to described receiving status information, determining the packet that has loss, obtain the packet of loss from described source via node according to described receiving status information, reduce the possibility of source evolution base station lost data packets in handoff procedure, minimizing source via node returns to the bag quantity that clears data of source evolution base station, save Radio Resource.

With said apparatus accordingly, the embodiment of the present invention also provides a kind of via node, as shown in figure 15, embodiment of the present invention via node comprises:

State information transmitting element 1501, for sending the receiving status information of subscriber equipment to the source evolution base station;

Packet loss message sink unit 1502, for receiving the packet loss message sent by described source evolution base station;

Obliterated data transmitting element 1503, for 1502 while receiving packet loss message, sending the packet of losing in described packet loss message sink unit to described source evolution base station according to described packet loss message.

Further, described via node also comprises:

The handover request transmitting element, for sending handover request to described source evolution base station;

The Indication message transmitting element, for sending switch indicating information to described source evolution base station;

Receiving element is confirmed in switching, for receiving the Handover Request Acknowledge sent by described source evolution base station.

Perhaps, described via node also comprises:

The measurement report transmitting element, for sending the measurement report of described subscriber equipment to described source evolution base station;

The switching command receiving element, for receiving the switching command sent by described source evolution base station.

Further, described obliterated data transmitting element 1503 specifically also comprises:

Sequence number is obtained subelement, obtains the sequence number of the packet of loss for the packet loss message received from described packet loss message sink subelement;

Obliterated data sends subelement, for obtain the sequence number that subelement obtains according to described sequence number, sends the packet of described loss to described source evolution base station.

The via node that the embodiment of the present invention provides, the receiving status information of subscriber equipment is sent to the source evolution base station, make the source evolution base station after the packet that stops removing subscriber equipment described in buffer memory, can determine whether to exist lost data packets according to the receiving status information of subscriber equipment, the packet loss message that described via node sends according to the source evolution base station sends packet to the source evolution base station, reduce the possibility of source evolution base station lost data packets in handoff procedure, minimizing source via node returns to the bag quantity that clears data of source evolution base station, saves Radio Resource.

With said method, the device accordingly, the embodiment of the present invention also provides a kind of switching processing system, as shown in figure 16, embodiment of the present invention switching processing system comprises evolution base station and via node: described evolution base station is connected with at least one via node; Described evolution base station comprises source evolution base station 1602 and target evolution base station 1603; Described via node comprises source via node 1601 and target via node 1604;

Wherein, described source evolution base station 1602, for when definite subscriber equipment need to switch, or, in the appointment moment of determining after described subscriber equipment need to switch, stop removing the packet of subscriber equipment described in buffer memory; And obtain the receiving status information of described subscriber equipment from described source via node 1601; When according to described receiving status information, determining the packet that has loss, obtain the packet of described loss from described source via node 1601 according to receiving status information;

Described source via node 1601, for sending the receiving status information of subscriber equipment to source evolution base station 1602; And send to described source evolution base station 1602 packet of losing according to the packet loss message of described source evolution base station 1602.

Further, described source evolution base station 1602, also for sending the packet of described subscriber equipment and/or the accepting state message of described subscriber equipment according to described receiving status information to described target evolution base station 1603 or described target via node 1604;

Described target evolution base station 1603, the packet of the described subscriber equipment sent by described source evolution base station 1602 for reception and/or the accepting state message of described subscriber equipment;

Described target via node 1604, the packet of the described subscriber equipment sent by described source evolution base station 1603 for reception and/or the accepting state message of described subscriber equipment.

The switching processing system that the embodiment of the present invention provides, by the source evolution base station when definite subscriber equipment need to switch, perhaps in the appointment moment of determining after described subscriber equipment need to switch, stop removing the packet of the described subscriber equipment received by the source via node in buffer memory, and obtain the receiving status information of described subscriber equipment from the source via node, when according to described receiving status information, determining the packet that has loss, obtain the packet of loss from described source via node according to described receiving status information, reduce the possibility of source evolution base station lost data packets in handoff procedure, minimizing source via node returns to the bag quantity that clears data of source evolution base station, save Radio Resource.

One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, to come the hardware that instruction is relevant to complete by computer program, described program can be stored in a computer read/write memory medium, this program, when carrying out, can comprise the flow process as the embodiment of above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.

The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by the described protection range with claim.

Claims

1. a switching handling method, is characterized in that, comprising:

Need to be from source via node (S-RN) while being switched to destination node at definite subscriber equipment, or determining that appointment that described subscriber equipment need to be from S-RN be switched to destination node constantly, stops removing the packet of subscriber equipment described in buffer memory;

Obtain the receiving status information of described subscriber equipment from the source via node;

2. switching handling method according to claim 1, is characterized in that, determines that described subscriber equipment need to be switched to destination node from S-RN and comprise:

The handover request that reception is sent by described source via node, and determine that according to described handover request described subscriber equipment needs switching; Perhaps,

The measurement report of the described subscriber equipment that reception is sent by described source via node, and determine that according to described measurement report described subscriber equipment needs switching.

3. switching handling method according to claim 1, is characterized in that, described definite described subscriber equipment need to the appointment from S-RN is switched to destination node be constantly:

Determine that described subscriber equipment need to switch the time be carved into and determine that described subscriber equipment is allowed to the arbitrary moment between moment of switching, perhaps, determine that described subscriber equipment is allowed to the moment of switching, perhaps, determine that described subscriber equipment need to switch the time be carved into and stop sending the arbitrary moment between moment of packet of described subscriber equipment to described source via node, perhaps, stop sending to described source via node the moment of the packet of described subscriber equipment;

The described moment that stops sending to described source via node the packet of described subscriber equipment is:

Determine that described subscriber equipment is allowed to the moment of switching, perhaps, send the moment of Handover Request Acknowledge or switching command to described source via node, perhaps, determine described subscriber equipment be allowed to switching the time be carved into to described source via node and send the moment between moment of Handover Request Acknowledge or switching command, perhaps, receive the moment of described receiving state report; Perhaps, to described source via node send Handover Request Acknowledge or switching command the time be carved into the moment between the moment that receives described receiving state report.

4. switching handling method according to claim 3, is characterized in that, determines that described subscriber equipment is allowed to switching and comprises:

Determine that according to the access control result of carrying out described subscriber equipment is allowed to switching; Perhaps,

The Handover Request Acknowledge that reception is sent by destination node, and determine that according to described Handover Request Acknowledge described subscriber equipment is allowed to switching; Perhaps,

The switch indicating information that reception is sent by described source via node, and determine that according to described switch indicating information described subscriber equipment is allowed to switching.

5. switching handling method according to claim 1, is characterized in that, the described receiving status information that obtains described subscriber equipment from described source via node comprises:

The receiving state report that reception is sent by described source via node;

Obtain the receiving status information of described subscriber equipment from described receiving state report.

6. switching handling method according to claim 1, is characterized in that, the described packet that obtains described loss from described source via node according to described receiving status information comprises:

Determine the packet of losing according to described receiving status information;

Send packet loss message to described source via node, described packet loss message is carried the sequence number of the packet of described definite loss;

The packet of the described loss that reception is sent by described source via node.

7. according to claim 1 or 2 or 3 or 6 or 7 described switching handling methods, it is characterized in that, described receiving status information comprises:

The sequence number of the last one or more new packet sent of described source via node, and by described subscriber equipment, do not confirmed the correctly sequence number of the packet of reception; Perhaps,

The sequence number of the one or more new packet that described source via node does not send at first, and by described subscriber equipment, do not confirmed the correctly sequence number of the packet of reception; Perhaps,

The sequence number of the last one or more new packet sent of described source via node; Perhaps,

The sequence number of the one or more new packet that described source via node does not send at first;

The described packet according to the definite loss of described receiving status information comprises:

According to the described sequence number of by described subscriber equipment, not confirmed the packet of subscriber equipment described in the sequence number of the correct packet received and buffer memory, determine the non-existent packet of by described subscriber equipment, being confirmed correct reception in buffer memory, using described definite packet correctly received by described subscriber equipment confirmation as the packet of losing; Perhaps,

Sequence number according to the new packet of described last transmission, and the sequence number of the packet of the described subscriber equipment of buffer memory, determine that sequence number is at the sequence number of the new packet of described last transmission and the packet between the sequence number of the packet of buffer memory at first, using described established data bag as the packet of losing; Perhaps,

Sequence number according to the described new packet do not sent at first, and the sequence number of the packet of the described subscriber equipment of buffer memory, determine the packet of sequence number that sequence number is the described new packet do not sent at first or the sequence number between the sequence number of the sequence number of the described new packet do not sent at first and the packet of buffer memory at first, the packet using described established data bag as loss.

8. switching handling method according to claim 1, is characterized in that, also comprises:

When according to described receiving status information is definite, having unnecessary packet, according to described receiving status information, remove unnecessary packet described in buffer memory.

9. switching handling method according to claim 1, is characterized in that, also comprises:

Send the accepting state message of packet and/or the described subscriber equipment of described subscriber equipment to described destination node according to described receiving status information, the receiving state report of the described subscriber equipment that described accepting state message is the via node transmission of described source, perhaps, described accepting state message is carried the sequence number of the last one or more new packet sent of described source via node or the sequence number of the one or more new packet that do not send at first.

10. switching handling method according to claim 1, is characterized in that, also comprises:

Send bi-casting/multicast request by Mobility Management Entity to gateway, described bi-casting/multicast request is for asking described gateway to send packet to target evolution base station and source evolution base station bi-casting/multicast;

The bi-casting that reception is forwarded by described Mobility Management Entity/multicast request is confirmed;

The packet that reception is sent by described gateway bi-casting/multicast;

Determine that according to bi-casting/multicast sign clean culture sends packet;

According to described receiving status information, do not send and confirmed that by described subscriber equipment the correct clean culture that receives or do not send to described subscriber equipment sends packet to described destination node, and/or send the accepting state message of described subscriber equipment to described destination node, the receiving state report of the described subscriber equipment that described accepting state message is the via node transmission of described source, perhaps, described accepting state message is carried the sequence number of the last one or more new packet sent of described source via node or the sequence number of the one or more new packet that do not send at first.

11. switching handling method according to claim 1, it is characterized in that, described packet is PDCP Service Data Unit or PDCP protocol Data Unit or wireless link service control data cell or wireless link control protocol data cell;

The sequence number of described packet is PDCP Service Data Unit sequence number or PDCP protocol data unit sequence number or wireless link service control data unit sequence number or wireless link control protocol data cell sequence number.

12. a base station, is characterized in that, comprising:

The switching determining unit, for determining whether subscriber equipment need to be switched to destination node from source via node (S-RN);

Stop clearing cell, for when described switching determining unit determines that described subscriber equipment need to be switched to destination node from S-RN, or determine that in described switching determining unit appointment that described subscriber equipment need to be from S-RN be switched to destination node constantly, stops removing the packet of subscriber equipment described in buffer memory;

Information acquisition unit, for obtaining the receiving status information of described subscriber equipment from the source via node;

The obliterated data acquiring unit, while for determining in described obliterated data determining unit, having the packet of losing, the receiving status information obtained according to described information acquisition unit obtains the packet of described loss from described source via node.

13. base station according to claim 12, is characterized in that, described switching determining unit comprises:

The handover request judgment sub-unit, determine that for the handover request that receives the subelement reception according to described handover request described subscriber equipment needs switching.

14. base station according to claim 12, is characterized in that, described switching determining unit comprises:

15. base station according to claim 12, is characterized in that, described information acquisition unit comprises:

16. base station according to claim 12, is characterized in that, described obliterated data acquiring unit comprises:

17. base station according to claim 12, is characterized in that, also comprises:

18. base station according to claim 12, is characterized in that, also comprises:

19. base station according to claim 18, is characterized in that, also comprises:

The new data receiving element, for receiving the packet sent by described gateway bi-casting/multicast;

Described data transmission unit comprises: