CN101047967A - Method and device for processing data at switchover procedure - Google Patents
Method and device for processing data at switchover procedure Download PDFInfo
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Abstract
The invention discloses a method of data processing in the switching process, applying to the wireless evolution network. After the source base station sends switching order to the target base station and receives the message of permission, the source base station transfers the data to the target station, which includes all PDCP data packets buffer queue corresponding to the current user equipment and the follow-up received data accessing gateway to send to user equipment for switching. The described PDCP packet buffer queue includes the packaged ARQ data and PDCP data packets without the confirmation. The target base station reserves the data transmitted by the source one into itself PDCP data packet. The invention also discloses a kind of base station equipment.
Description
Technical field
The present invention relates to the wireless evolution network technology of the communications field, relate in particular in the wireless evolution network, the method for deal with data and device in handoff procedure.
Background technology
In the radio gradual network system in future, the network evolution architecture has multiple candidate scheme, and wherein popular have a two-layer node framework, as shown in Figure 1.In this framework, base station eNodeB is the base station node B after the evolution, the function of most radio network controller (RNC) before having.(Access GW AGW) has former core net node to IAD, such as most of function or the function combinations of SGSN or GGSN.Wherein, Outer ARQ function mainly is placed on the eNodeB place.
For fear of based on producing the data cached problem of losing in eNodeB place, source in the handoff procedure of this framework, existing technical scheme mostly adopts the data forwarding mode in handoff procedure.A kind of switching flow is as shown in Figure 2:
1, reported by user equipment UE measurement report;
2, source eNodeB switches according to the measurement report decision that UE reports;
3, source eNodeB sends Context Tranfer message to target eNode B;
4, target eNode B is carried out resource allocation;
5, after resource allocation was finished, target eNode B sent Context TransferResponse message to source eNodeB;
6, source eNodeB will be forwarded to target eNode B at the downlink data that the data of not receiving UE confirmation of receipt ACK as yet of this locality storage and the AGW that constantly receives send;
7, source eNodeB sends RB Reconfiguration message to UE;
8, UE is synchronized to target eNode B;
9, finish synchronously after, UE sends RB Reconfiguration Complete message to target eNode B;
10, target eNode B sends Path Switch Request message, request toggle path to AGW;
11, the AGW toggle path arrives target eNode B, and sends Release message, release way to source eNodeB.
Under the two-layer node framework of evolvement network, the data processing of base station side as shown in Figure 3, the descending data of core network CN at first arrive IAD, after encrypt at IAD, head compression etc. handled, generate PDCP PDCP packet, by the interface between CN and the RAN data are sent to base station side again.After the base station receives the PDCP packet,, put it into the formation of corresponding PDCP data pack buffer according to the attribute of Business Stream under it.The all corresponding PDCP data packet queue of each Business Stream, therefore, a subscriber equipment may corresponding a plurality of PDCP data packet queues.Cut apart/the related resource information of eating dishes without rice or wine that recombination module provides according to scheduler, to the operation of packing of the data in the formation of PDCP data pack buffer, be packaged into automatic repeat requests ARQ packet, and put into the formation of ARQ data pack buffer, the PDCP packet after packaged the finishing is deleted from formation.Scheduler transmits the data packet dispatching in the formation of ARQ data pack buffer according to certain dispatching algorithm in the link of eating dishes without rice or wine.After a certain ARQ packet receives corresponding ACK, it is deleted from the formation of ARQ data pack buffer.
In the prior art,, after the PDCP packing data is the ARQ packet, will from the PDCP buffer queue, delete in order to reduce buffer data size, therefore, need be when transmitting data with the data forwarding in the formation of ARQ data pack buffer to target BS.And the ARQ packetization rules of source base station and target BS may be different, so target BS needs to be reassembled as it whole or part PDCP packet after receiving the ARQ packet, and then pack by the ARQ packetization rules of this base station; Simultaneously, even subscriber equipment has been received some ARQ packets wherein, target BS still will issue these ARQ packets again to subscriber equipment.Therefore, this scheme makes that not only the processing of target BS is very complicated, and it realizes that difficulty is big, and waste mouthful null resource.In addition, specifically how to handle the forwarding data that receive for target BS, prior art does not provide concrete implementation, becomes the problem that industry need solve.
Summary of the invention
The invention provides a kind of in handoff procedure the method and the device of deal with data, exist and handle complicated and repeat to transmit data and the problem of wasting interface-free resources to solve target base station processes data in the existing handoff procedure.Further, realize target BS processing forward data preferably, realize harmless the switching.
The invention provides following technical scheme:
A kind of in handoff procedure the method for deal with data, this method is carried out following steps at source base station after target BS sends the handoff request signaling and receives the response signaling that allows to switch:
Source base station is given target BS with the current data forwarding that sends to be switched subscriber equipment corresponding to the data in all PDCP data pack buffer formations of to be switched subscriber equipment and the follow-up IAD that receives, and comprises the PDCP packet that is packaged as the ARQ packet and does not receive the confirmation message in the formation of wherein said PDCP data pack buffer;
The data that described target BS is transmitted source base station are saved in the corresponding PDCP data pack buffer formation of this base station.
Wherein:
Source base station from team's head of PDCP buffer queue, adopts first-in first-out to transmit data when transmitting data.
Source base station stops to send the data that belong to non-real-time service stream to be switched subscriber equipment after receiving the handoff response signaling.Further, source base station is deleted it after giving target BS with the data forwarding of non-real-time service stream from the PDCP buffer queue.
Source base station is retained in the PDCP buffer queue it after the data of transmitting real time business stream, and continues to send to be switched subscriber equipment the data of real time business stream before finishing switching.
Source base station just discharges the related resource of described to be switched subscriber equipment after only the packet in corresponding PDCP data pack buffer formation is transmitted and finished when the resource release command of receiving target base station.
After target BS received the real time business stream of source base station forwarding, beginning sent the data of this real time business stream to be switched subscriber equipment.
Target BS receives behind the non-real-time service stream that source base station transmits metadata cache in the PDCP buffer queue, and is receiving the data that begin to send this non-real-time service stream after signaling is finished in switching that subscriber equipment sends.Further, the information that carries the current PDCP packet that has successfully received of subscriber equipment in the signaling is finished in described switching; Described information comprise each PDCP of this subscriber equipment connect in the sequence number of last complete PDCP bag that is correctly received continuously and all information of the PDCP bag of complete reception not afterwards.
A kind of base station equipment comprises:
Storage device is used for the PDCP packet that buffer memory sends to subscriber equipment, wherein comprises the PDCP packet that has been packaged as the ARQ packet and has not received the confirmation message;
Dispensing device is used for the PDCP packet of buffer memory is sent to subscriber equipment;
Retransmission unit is used for after receiving the response signaling that allow to switch, and transmits the PDCP packet of current all buffer memorys corresponding to be switched subscriber equipment and the data that the follow-up IAD that receives sends to be switched subscriber equipment.
Beneficial effect of the present invention is as follows:
1, data forwarding is carried out at the PDCP packet, has simplified the processing procedure of target BS data recombination.
2, user equipment (UE) is finished in switching and is reported the mode of confirming reception information in the signaling, has reduced the repetition and waste of interface-free resources.
3, when load is light, real time business and non-real-time service are treated with a certain discrimination, exchange real time business short break period for the cost of certain interface-free resources.
Description of drawings
Fig. 1 is the radio gradual network structure schematic diagram of two-layer node in the prior art;
Fig. 2 is the flow chart that switches subscriber equipment in the prior art;
Fig. 3 is the schematic diagram that base station side sends data in the prior art to subscriber equipment;
Fig. 4 is the signaling process figure of chain of command when switching in the wireless evolution network in the embodiment of the invention;
Fig. 5 is the structural representation of a kind of base station equipment in the embodiment of the invention;
Fig. 6 be in the embodiment of the invention in handoff procedure the flow chart of deal with data;
Fig. 7 be in the embodiment of the invention in handoff procedure the transfer of data sequential schematic diagram of real time business and non-real-time service.
Embodiment
For a more clear understanding of the present invention, at first describe in the wireless evolution network signaling process process of chain of command when switching, consult shown in Figure 4ly, its process is as follows:
1, before the switching, needs to understand the location area information and the lane place restricted information of subscriber equipment.
2, measure the mutual of control and report between source base station and the subscriber equipment.
3, source base station carries out handover decisions according to measurement report.
4, source base station sends the handoff request signaling to target BS.
5, target BS carries out resource reservation according to the handoff request signaling that receives.
6, target BS sends the handoff response signaling to source base station, and source base station promptly begins to carry out the process of data forwarding after receiving the handoff response order.
7, source base station sends the switching command signaling to subscriber equipment.
8, subscriber equipment disconnects from the link of source base station, carries out synchronously with the link of target BS.
9, after finishing synchronously, subscriber equipment sends to switch to target BS finishes signaling, for forwarding and the subsequent treatment of supporting data surface, and the information of the PDCP layer data bag that subscriber equipment receives before comprising in this signaling.
10, target BS send to switch to IAD and finishes signaling, (10.1 receive this signaling after, IAD switches to target BS with transmission path from source base station).
11, target BS sends the resource release command to source base station, and this order also can send to source base station (11.1 source base stations discharge related resource after receiving the resource release command, comprise customer equipment context information, queue resource etc.) by IAD.
12, finish switching after, upgrade lane place and lane place restricted information, flow process finishes.
Consult Fig. 3, in the present embodiment, cut apart/the related resource information of eating dishes without rice or wine that recombination module provides according to scheduler, to the operation of packing of the data in the formation of PDCP data pack buffer, be packaged into automatic repeat requests ARQ packet, and put into the formation of ARQ data pack buffer, and the PDCP packet after packaged the finishing do not delete from formation, but stay the follow-up affirmation of wait in the formation.
Scheduler transmits the data packet dispatching in the formation of ARQ data pack buffer according to certain dispatching algorithm in the link of eating dishes without rice or wine.After a certain ARQ packet receives corresponding ACK, it is deleted from the formation of ARQ data pack buffer; When all ARQ packets that belong to a certain PDCP packet are all deleted, then notify the formation of PDCP data pack buffer, this PDCP packet is deleted from formation.
When system moves, the PDCP packet only just cut apart in the time need transmitting by scheduler decision-making/and recombination module is packaged into the ARQ packet and puts into the formation of ARQ data pack buffer, therefore, data in the formation of ARQ data pack buffer are also few, mainly are the packets that has sent wait acknowledge for the first time or re-transmission.
In the present embodiment, source base station (is the step 6) among Fig. 4 after receiving the handoff response of target BS, to transmit to target BS corresponding to the data in all PDCP data pack buffer formations of to be switched subscriber equipment in this base station immediately, the data of also IAD being sent simultaneously that will go to this subscriber equipment are transmitted to target BS; After target BS receives these data, it is cached in the formation of corresponding PDCP data pack buffer.
When target BS was transmitted data, for the order that guarantees that data send, the source base station employing went out (FIFO) mode earlier and transmits data, promptly begins to transmit data from team's head at source base station, and the data that newly receive are put into tail of the queue.
Further, all Business Streams (each Business Stream corresponding PDCP data pack buffer formation) the classify processing of source base station to belonging to this subscriber equipment, for non real-time Business Stream, former base station stops to send data to subscriber equipment, and deletes from formation when data are being forwarded away; For real-time Business Stream, then after data are forwarded away, still be retained in the formation of PDCP data pack buffer, proceed normal descending transmission for source base station, up to receiving that the resource release signaling (is the step 11) among Fig. 4, in this process, if receive the ACK of subscriber equipment, still carry out normal running, promptly the corresponding packet of deletion from the ARQ formation if whole ARQ packets of a certain PDCP bag are all responded, is then deleted this PDCP bag.Accordingly, target BS also to the Business Stream that the forwards processing of classifying, for real-time Business Stream, receives that data promptly begin normal data downstream transmission process; For non real-time Business Stream, then with metadata cache in formation, receive to switch to begin to send after finishing signaling and handle (being step 9 step among Fig. 4) up to receiving.Like this, before switching is finished, stop to send non-real-time service stream, can save interface-free resources.Real-time resource is sent simultaneously at source base station and target BS, finishing synchronous back at subscriber equipment (is step 8) among Fig. 4 can receive real time business at once from target BS data, therefore, exchange real time business for than short break period with the cost that consumes less interface-free resources, thereby can improve service quality.
Repeat to send the data that subscriber equipment has received for fear of target BS, finish the information of carrying the present PDCP packet that has successfully received of subscriber equipment in the signaling in the switching that subscriber equipment sends to target BS.This information comprise each PDCP of this subscriber equipment connect in the sequence number of last complete PDCP bag that is correctly received continuously and all information of the PDCP bag of complete reception not afterwards, the skew of the part that comprise sequence number, has received and length.Target BS is after signaling is finished in the switching of receiving subscriber equipment, according to the information in the signaling, with the complete PDCP bag deletion that has been successfully received in the respective queue, simultaneously will be not the information of PDCP bag of complete reception as the input parameter of cutting apart recombination module, skip the partial data of the PDCP bag that has been received by subscriber equipment in the regrouping process in follow-up cutting apart.Simultaneously, target BS send to switch to IAD and finishes signaling (be the step 10) among Fig. 4, IAD is transferred to target BS with the route of this subscriber equipment corresponding service from source base station after receiving this signaling.
Under the more situation of the data of transmitting at needs, can guarantee these data all are forwarded to target BS, source base station is at the resource release signaling that receives target BS (when being the step 11) among Fig. 4, if finding the packet in the formation of corresponding PDCP data pack buffer does not also have to transmit to finish, then earlier its forwarding is finished, source base station discharges the related resource of this subscriber equipment afterwards, comprises corresponding queue resource deletion.
A kind of realize in the present embodiment base station equipment as shown in Figure 5, comprise storage device 50, dispensing device 51, receiving system 52 and retransmission unit 53 at least; Storage device 50 is used for the PDCP packet that buffer memory sends to subscriber equipment, adopts formation mode buffer memory during storage; Comprise the PDCP packet that is packaged as the ARQ packet and does not receive the confirmation message in the PDCP packet; Dispensing device 51 is used for the PDCP packet of storage device 50 buffer memorys is sent to subscriber equipment; The PDCP data pack buffer that sends to subscriber equipment that receiving system is used for receiving is to storage device 50; Retransmission unit 53 is used for after receiving the response signaling that allow to switch, and transmits the PDCP packet of current all buffer memorys corresponding to be switched subscriber equipment in the storage device 50 and the data that the follow-up IAD that receives sends to be switched subscriber equipment.
Consult shown in Figure 6ly, the detailed process of deal with data is as follows in handoff procedure:
After step 600, source base station are received the handoff response of target BS, retransmission unit 53 begins and will transmit to target BS corresponding to the data in all PDCP data pack buffer formations of to be switched subscriber equipment in this base station, and also 52 that receive with receiving system simultaneously, IAD sends to the data forwarding for the treatment of user's equipment and gives target BS.
Data sink 52 in step 620, the target BS receives the data that source base station is transmitted, and it is saved in the formation of corresponding PDCP data pack buffer.
In above-mentioned processing procedure, the sequential relationship of handling real time business and non-real-time service reason is as shown in Figure 7: for non-real-time service and real time business, subscriber equipment all is to be carved into T4 not receive any data constantly when T3, and source base station all is to begin to carry out data forwarding from the source base station to the target BS constantly from T1.And for non-real-time service, source base station constantly promptly stops to send data at T1, target BS constantly just begins to send data at T6, therefore, being carved into T4 moment subscriber equipment during except T3 carries out the synchronizing process, be carved into T6 constantly when being carved into the T3 moment and T4 when T1, the business of subscriber equipment also can be interrupted; For real time business, source base station just stops to send data fully when receiving resource release information and formation for sky, and target BS then begins just to send data constantly from T1.Therefore, for real time business, all send the process of data simultaneously from coming into existence constantly source base station and target BS of T1, though it is true to take a spot of interface-free resources, be carved into when having guaranteed T1 T3 constantly and the business that is carved into the T6 moment subscriber equipment during T4 do not interrupt.
Under the heavier situation of cell load, real time business and non-real-time service can not treated with a certain discrimination yet, and the common scheme that adopts at non-real-time service is with the interface-free resources that practices every conceivable frugality.
The present invention program has provided the handoff procedure in a kind of wireless evolution network.Specific definition the data forwarding process of data surface, and solved the parsing problem of duplicating of data.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (15)
1, a kind of in handoff procedure the method for deal with data, be applied to wireless evolution network; It is characterized in that source base station carries out following steps after target BS sends the handoff request signaling and receives the response signaling that allows to switch:
Source base station is given target BS with the current data forwarding that sends to be switched subscriber equipment corresponding to the data in all PDCP data pack buffer formations of to be switched subscriber equipment and the follow-up IAD that receives, and comprises the PDCP packet that is packaged as the ARQ packet and does not receive the confirmation message in the formation of wherein said PDCP data pack buffer;
The data that described target BS is transmitted source base station are saved in the corresponding PDCP data pack buffer formation of this base station.
2, the method for claim 1 is characterized in that, source base station from team's head of PDCP buffer queue, adopts first-in first-out to transmit data when transmitting data.
3, the method for claim 1 is characterized in that, source base station stops to send the data that belong to non-real-time service stream to be switched subscriber equipment after receiving the handoff response signaling.
4, method as claimed in claim 3 is characterized in that, source base station is deleted it after giving target BS with the data forwarding of non-real-time service stream from the PDCP buffer queue.
5, the method for claim 1 is characterized in that, source base station is retained in the PDCP buffer queue it after the data of transmitting real time business stream, and continues to send to be switched subscriber equipment the data of real time business stream before finishing switching.
6, the method for claim 1 is characterized in that, source base station just discharges the resource of described to be switched subscriber equipment after only the packet in corresponding PDCP data pack buffer formation is transmitted and finished when the resource release command of receiving target base station.
7, the method for claim 1 is characterized in that, after target BS received the real time business stream of source base station forwarding, beginning sent the data of this real time business stream to be switched subscriber equipment.
8, as the described method of one of claim 1 to 7, it is characterized in that, target BS receives behind the non-real-time service stream that source base station transmits metadata cache in the PDCP buffer queue, and is receiving the data that begin to send this non-real-time service stream after signaling is finished in switching that subscriber equipment sends.
9, method as claimed in claim 8 is characterized in that, the information that carries the current PDCP packet that has successfully received of subscriber equipment in the signaling is finished in described switching.
10, method as claimed in claim 9 is characterized in that, described information comprise each PDCP of this subscriber equipment connect in the sequence number of last complete PDCP bag that is correctly received continuously and all information of the PDCP bag of complete reception not afterwards.
11, method as claimed in claim 9, it is characterized in that, target BS is after signaling is finished in the switching of receiving subscriber equipment, with the complete PDCP packet deletion that has been successfully received in the respective queue, and incite somebody to action the input parameter that reorganization is cut apart in the not information conduct of the PDCP packet of complete reception, skip the PDCP packet partial data that has been received in the regrouping process in follow-up cutting apart by subscriber equipment.
12, a kind of base station equipment is characterized in that, comprising:
Storage device is used for the PDCP packet that buffer memory sends to subscriber equipment, wherein comprises the PDCP packet that has been packaged as the ARQ packet and has not received the confirmation message;
Receiving system, the PDCP metadata cache that is used for receiving is to described storage device;
Dispensing device is used for the PDCP packet of buffer memory is sent to subscriber equipment;
Retransmission unit is used for after receiving the response signaling that allow to switch, and transmits the PDCP packet of current all buffer memorys corresponding to be switched subscriber equipment and the data that the follow-up IAD that receives sends to be switched subscriber equipment.
13, base station equipment as claimed in claim 12 is characterized in that, described dispensing device stops to send the data that belong to non-real-time service stream to be switched subscriber equipment after receiving the handoff response signaling.
14, base station equipment as claimed in claim 12 is characterized in that, described retransmission unit is deleted it after the data of transmitting non-real-time service stream from the PDCP buffer queue.
15, base station equipment as claimed in claim 12 is characterized in that, described retransmission unit is retained in the PDCP buffer queue it after the data of transmitting real time business stream; Described dispensing device continues to send to be switched subscriber equipment the data of real time business stream before finishing switching.
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