CN104935414A - Method for transmitting information in dual connection system and device - Google Patents
Method for transmitting information in dual connection system and device Download PDFInfo
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- CN104935414A CN104935414A CN201410109925.XA CN201410109925A CN104935414A CN 104935414 A CN104935414 A CN 104935414A CN 201410109925 A CN201410109925 A CN 201410109925A CN 104935414 A CN104935414 A CN 104935414A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
- H04W28/0242—Determining whether packet losses are due to overload or to deterioration of radio communication conditions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
Abstract
The invention aims to provide a method for transmitting information in a dual connection system and a device thereof. According to the method and the device, a PDCP layer body is included in the dual connection system and comprises a sending device for sending information to be sent and corresponding indication information to the RLC layer correspoding to a PDCP layer, wherein the indication information is used for indicating an RLC layer body to determine the transmission sequence of the information to be sent. The method and the device have the advantages that a PDCP state data packet unit and a PDCP data packet retransmission unit are optimized, and thus PDCP PDU can be transmitted as soon as possible.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of method and apparatus of transmission information in dual link system.
Background technology
Along with the development of the communication technology, the basis of original architectures of communication networks is continually developed the communication system of improvement, can provide more convenient and data communication services efficiently for user.
Dual link system is a kind of improvement communication system proposed.In dual link system, user terminal can carry out uplink communication and downlink communication with two (or more) base stations simultaneously.In two (or more) base stations of carrying out communicating with user terminal, there is a dominant base, it can manage the communication of dual link system, and all the other base stations are prothetic group station.
In the dual link system supporting 3C user plane framework, PDCP (PDCP, Packet Data Convergence Protocol) Packet Data Unit (PDU, Packet Data Unit) at dominant base (MeNB, Master eNB) in be created, and part be transmitted to prothetic group station, by different paths, such as transfer to user by dominant base and prothetic group station (SeNB, Secondary eNB).May there is data-bag lost when being transmitted by Xn interface between MeNB and SeNB in PDCP PDU, in normal transmitting procedure, therefore also need user to send PDCP status PDU carry out request retransmission,
Except this, when there is transmission path change in dual link system, also need to send PDCP status PDU and reduce and optimize re-transmission.Such as, when radio bearer is reshuffled, data transfer path may change, and therefore needs to forward and retransmits the PDCP PDU not transmitting or do not receive acknowledge message being stored in rlc layer, now just needs to send PDCP status PDU and reduces and optimize re-transmission; Again such as, in dual link system, according to the conclusion in present 3GPP standardization, when user switches to another dominant base from a dominant base, the data at prothetic group station can pass to source dominant base, and then the PDCP PDU not transmitting or do not receive acknowledge message at source dominant base and prothetic group station will be forwarded to target dominant base.Now also need to optimize and retransmit.Again such as, for user plane 1A structure, when prothetic group station changes, the PDCP PDU not transmitting or do not receive acknowledge message at prothetic group station, source directly or can be transmitted to target prothetic group station by dominant base.Now same needs optimizes re-transmission.
Therefore, in dual link system, need to send PDCP status PDU and re-transmission is optimized, to retransmit corresponding PDCP PDU.
In the prior art, in MAC layer, can by the ACK/NACK information of timing transmission as feedback information, guarantee that feedback information is received as early as possible, at rlc layer, for affirmation mode RLC entity, by sending RLC control protocol data cell (PDU, Protocoldata unit) as feedback information request retransmission, this RLC control PDU has higher priority to send than RLC data PDU, to guarantee that feedback message is received as early as possible.
But in conventional systems, PDCP status PDU is only transmitted in process of reconstruction (reestablishment).So the chance of transmission PDCP status PDU is very little.But in dual link system, all need transmission PDCP status PDU in these cases.Further, in dual link system, the usual of rlc layer can the data waiting for transmission such as buffer memory is a large amount of, and such as, SeNB can be used for shunting the business with mass data, and this mass data will be cached in RLC; Again such as, based on current buffer status report table (BSR, Buffer StatusReport), buffer area is maximum reaches 3000000 bytes, that is might have stored the data of 3000000 bytes in rlc layer; In addition, for 3C framework, PDCP buffer area is greater than legacy system, and to make it tackle imperfect round-trip delay and the transmission from two base stations, correspondingly, this requires that the buffer area of rlc layer is also larger than legacy system.Therefore, the PDCP function to improving is needed to discuss, to solve the problem of fast transport PDCP status PDU.
And, in the prior art, retransmitting (re-transmission) occurs over just in reconstruction (re-establishment) process, because when rebuilding, the buffer memory of rlc layer can empty, therefore now need the PDCP PDU retransmitted naturally to be stored in the queue front of rlc layer data to be sent, thus these PDU can be transmitted as early as possible.But, in dual link process, even if under normal transmission pattern, also can retransmit, then now because RLC buffer memory does not correspondingly empty, the PDCP PDU that these need to retransmit cannot be transmitted as early as possible.This is also urgent problem.
Summary of the invention
The object of this invention is to provide a kind of method and apparatus of transmission information in dual link system.
According to an aspect of the present invention, provide a kind of PDCP layer entity, wherein, described PDCP layer entity is contained in the equipment of dual link system, and described PDCP layer entity comprises:
Dispensing device, for information to be sent and the indication information corresponding with it are sent to the rlc layer corresponding with described PDCP layer, wherein, described indication information is used to indicate described rlc layer entity to determine the transmission sequence of described information to be sent.
According to an aspect of the present invention, additionally provide a kind of rlc layer entity, wherein, described rlc layer entity is contained in the equipment of dual link system, and described rlc layer entity comprises:
Second receiving system, for receiving information to be sent from the PDCP layer corresponding to described rlc layer and corresponding indication information thereof;
3rd determining device, for determining that according to described indication information the transmission sequence of described information to be sent is to transmit.
According to an aspect of the present invention, additionally provide a kind of in PDCP layer entity the method for transmission information, wherein, described PDCP layer entity is contained in the equipment of dual link system, said method comprising the steps of:
Information to be sent and the indication information corresponding with it are sent to the rlc layer corresponding with described PDCP layer by a, and wherein, described indication information is used to indicate described rlc layer entity to determine the transmission sequence of described information to be sent.
According to an aspect of the present invention, additionally provide a kind of in rlc layer entity the method for transmission information, wherein, described rlc layer entity is contained in the equipment of dual link system, said method comprising the steps of:
A receives from the information to be sent of the PDCP layer corresponding to described rlc layer and corresponding indication information thereof;
According to described indication information, B determines that the transmission sequence of described information to be sent is to transmit.
According to an aspect of the present invention, additionally provide a kind of equipment, wherein, described equipment comprises described PDCP layer entity and/or described rlc layer entity.
Compared with prior art, the present invention has the following advantages: retransmit PDCP status data grouped element and PDCP data packet units and be optimized, by arranging for the much information in PDCP layer the indication information being used to indicate its corresponding transmission sequence, thus make rlc layer can prioritised transmission PDCP layer needs retransmit PDCP data PDU and PDCP status PDU, thus in the loss of data caused due to Xn interface, or the transmission path of user changes as there is reshuffling of radio bearer in dual link system, user guarantees when carrying out mobile handoff and the change of prothetic group station that the customizing messages of PDCP layer can be transferred in corresponding equipment as early as possible.Improve efficiency and the accuracy of information transmission.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 illustrates the schematic diagram of communication system according to an embodiment of the invention;
Fig. 2 illustrates according to a structural representation for the device of transmission information in dual link system of the present invention;
Fig. 3 illustrates according to a flow chart for the method for transmission information in dual link system of the present invention;
In accompanying drawing, same or analogous Reference numeral represents same or analogous parts.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Illustrate according to a dual link system of the present invention with reference to Fig. 1, Fig. 1.Wherein, described dual link system comprises multiple equipment.Wherein, described multiple equipment comprises at least one dominant base, at least one prothetic group station corresponding with this dominant base, and at least one subscriber equipment.Wherein, this subscriber equipment can be connected with a dominant base and a prothetic group station simultaneously, that is, this subscriber equipment and can dual link be there is between a dominant base and a prothetic group station.
Wherein, each equipment in multiple equipment of described dual link system comprises PDCP layer entity and/or RLC physical layer.
With reference to Fig. 2.Fig. 2 illustrates according to a structural representation for the device of transmission information in dual link system of the present invention.Wherein, PDCP layer entity according to the present invention and its corresponding rlc layer entity are contained in the equipment of dual link system respectively.
Preferably, described PDCP layer entity and corresponding rlc layer entity thereof can be contained in the same equipment of described dual link system simultaneously.
Wherein, PDCP layer entity according to the present invention comprises dispensing device 11, and rlc layer entity comprises the second receiving system 21 and the 3rd determining device 22.
With reference to the dispensing device in Fig. 2, PDCP layer entity, information to be sent and the indication information corresponding with it are sent to the rlc layer corresponding with described PDCP layer.
Wherein, described information to be sent comprises needs are sent to its corresponding RLC entity information by PDCP layer entity.Preferably, described information to be sent comprises following at least any one type:
1) PDCP status PDU (i.e. PDCP status PDU, or be called PDCP control PDU or PDCP control PDU);
2) PDCP data PDU(and the PDCP data PDU of re-transmission is needed).
Wherein, described indication information is used to indicate described rlc layer entity to determine the transmission sequence of described information to be sent.
Preferably, described indication information comprise following any one:
1) type information of described information to be sent; Such as, PDCP status PDU type, the PDCP data PDU type etc. of re-transmission;
2) the transmission priority of described information to be sent in corresponding rlc layer.Preferably, the transmission priority that described PDCP status PDU is corresponding is higher than the transmission priority of the PDCP dataPDU of described re-transmission.
According to a preferred embodiment of the present invention, described information to be sent comprises PDCP statusPDU, and PDCP layer entity according to the present invention also comprises apparatus for assembling (not shown).
When meeting preset trigger condition, apparatus for assembling assembles described PDCP status PDU, and determines the indication information corresponding with described PDCP status PDU.
Wherein, described preset trigger condition includes but not limited to following at least any one:
1) scheduled time condition; Wherein, described scheduled time condition include but not limited to following any one:
I) predetermined time interval; Such as, namely trigger apparatus for assembling every the scheduled time and perform corresponding operation;
Ii) predetermined point of time, such as, when arriving Preset Time point, namely triggers apparatus for assembling and performs corresponding operation.
2) detect that the PDCP PDU caused due to Xn interface loses.Such as, for user plane structure 3C, in normal transmission process, when the receiving algorithm belonging to PDCP layer entity detects that data PDCP PDU loses, when can judge that the PDCP PDU that the Xn interface between MeNB and SeNB causes loses, trigger apparatus for assembling and perform corresponding operation; Again such as, when detecting that the data PDCP PDU number of loss exceedes threshold value, trigger apparatus for assembling executable operations.
3) predetermined signaling is received.
Wherein, described predetermined signaling includes but not limited to the predetermined all kinds of signalings that can trigger apparatus for assembling assembling PDCPstatus PDU.
Preferably, described predetermined signaling can comprise the signaling under plurality of application scenes.
Such as, in downlink transmission, described predetermined signaling includes but not limited to as received by the subscriber equipment of signaling recipient, from the RRC signaling of base station.
Preferably, described predetermined signaling includes but not limited to any one RRC signaling following:
I) the RRC signaling of (RB re-configuration) is reshuffled for radio bearer
In dual link communication system, three kinds of radio bearer types can be configured simultaneously, i.e. dominant base carrying, the carrying of prothetic group station and segmentation carrying, these three kinds of carryings can be re-equipped from a type and put (re-configuration) and become another type, in time reshuffling generation, data transfer path may change, therefore need to forward the PDCP PDU not transmitting or do not receive acknowledge message being stored in rlc layer, in order to optimize re-transmission, need to send PDCPstatus PDU to ask the re-transmission of these PDCP PDU.And in time reshuffling generation, dominant base can send reconfiguration information to user terminal by RRC signaling.
Such as, in descending dual link system, when a radio bearer from dominant base carrying be re-equipped be set to prothetic group station carrying time, PDCP layer entity will be switched to prothetic group station from dominant base, after then user terminal is recovered to and reshuffles signaling RRC re-configuration accordingly, PDCP layer entity is instructed to produce PDCP status PDU, and to the target BS that needs switch to, that is this prothetic group station sends this PDCP status PD produced.
Ii) for the RRC signaling of the mobile handoff (mobility) between MeNB
In dual link system, user switches to another dominant base scene from a dominant base can be there is.Such as, according to the conclusion in present 3GPP standardization, when user switches to another dominant base from a dominant base, the data at prothetic group station can pass to source dominant base, and then the PDCP PDU not transmitting or do not receive acknowledge message at source dominant base and prothetic group station will be forwarded to target dominant base.In order to optimize re-transmission, need to send the next re-transmission to these PDCP PDU of target dominant base request of PDCP status PDU.And in time switching generation, dominant base can send handover information to user terminal by RRC signaling.
Iii) the RRC signaling of (SeNB change) is changed in dual link system for prothetic group station, the scene that the prothetic group station that user can occur changes.Such as, for user plane 1A structure, when prothetic group station changes, the PDCP PDU not transmitting or do not receive acknowledge message at prothetic group station, source directly or can be transmitted to target prothetic group station by dominant base.In order to optimize re-transmission, need to send the next re-transmission to these PDCP PDU of the auxiliary base station requests of target of PDCP status PDU, and when prothetic group station changes generation time, dominant base can send prothetic group station change information to user terminal by RRC signaling.
Wherein, those skilled in the art will be understood that; corresponding with above-mentioned downlink transmission, trigger apparatus for assembling executable operations based on the one or more signalings in uplink transmission process situation also should be contained in protection scope of the present invention, does not repeat them here.
According to a preferred version of the present embodiment, institute's preset trigger condition comprises and receives predetermined signaling, then described PDCP layer entity also comprises the first determining device (not shown).
First determining device, for according to described predetermined signaling, determines described PDCP status PDU target device extremely to be sent.
Now, when receiving predetermined signaling, described apparatus for assembling assembles described PDCP statusPDU, and determines the indication information corresponding with described PDCP status PDU.
Preferably, the PDCP status PDU of apparatus for assembling assembling for being sent to this target device, and determine the indication information corresponding with described PDCP status PDU.
Then, the indication information of described PDCP status PDU and correspondence thereof is sent to the rlc layer corresponding with this target device by described dispensing device.
According to the first example of the present invention, when subscriber equipment receives the RRC reconfiguration information from dominant base eNB_1, first determining device is according to received reconfiguration information, determine the target BS eNB_2 needing this PDCP status PDU to be sent to, then namely apparatus for assembling starts to assemble the PDCP status PDU be sent to needed for this target BS eNB_2, and according to predetermined corresponding relation, determine the indication information Ind_1 corresponding with this PDCP status PDU.Then, this PDCP status PDU is sent to the rlc layer corresponding with this target BS eNB_2 by dispensing device.
According to a preferred embodiment of the present invention, described information to be sent comprises the PDCP data PDU that needs retransmit, and PDCP layer entity according to the present invention also comprises first receiving device (not shown) and the second receiving system (not shown).
Wherein, first receiving device receives the PDCP status PDU from opposite equip. feedback.
Second determining device determines the PDCP data PDU that needs again to transmit and corresponding indication information thereof according to received PDCP status PDU.
Then, the indication information of described PDCP data PDU and correspondence thereof is sent to described rlc layer by dispensing device.
Then, the second receiving system in rlc layer entity receives from the information to be sent of the PDCP layer corresponding to described rlc layer and corresponding indication information thereof.
Then, according to described indication information, the 3rd determining device determines that the transmission sequence of described information to be sent is to transmit.
Particularly, the 3rd determining device determines the buffer memory order of described information to be sent according to described indication information, and described buffer memory order is transmitted as transmission sequence.
Preferably, be contained in the first sub-determining device (not shown) in the 3rd determining device according to the indication information of described information to be sent, determine the transmission priority corresponding with this indication information; Then, be contained in the second sub-determining device in the 3rd determining device according to described transmission priority, determine the memory sequencing of this information to be sent in RLC buffer memory, to transmit corresponding every terms of information successively based on described memory sequencing.
Wherein, the second sub-determining device, according to described transmission priority, determines the memory sequencing of at least one RLC SDU in RLC buffer memory that information to be sent with this is corresponding, to transmit corresponding every terms of information successively based on described memory sequencing.
Wherein, described transmission priority is used to indicate needs the preferential information sent.
Preferably, for the information with identical transmission priority, the second sub-determining device determines its buffer memory order based on time sequencing.
Preferably, the configuration of described rlc layer entity comprises following transmission priority rule:
In rlc layer, common PDCP data PDU will follow sequential delivery rule, and, first-in first-out rule.PDCP status PDU will walk around sequencer procedure, and with the form of RLC SDU, before being placed in all PDCP data PDU in buffer area, and to be used for transmission after other PDCP status PDU.After receiving scheduling authorization, rlc layer is by the specific transmission opportunity notified by lower layer entities, obtain the size of all RLC PDU indicated by low layer, and form RLC PDU by first these PDCP status PDU (because it is at the buffer area head of RLC) being put into RLC PDU.
Preferably, described priority rule: the RLC data PDU > that RLC data PDU > that is that RLC control PDU > retransmits or that comprise re-transmission segmentation comprises PDCP status PDU comprises the RLC data PDU of PDCP data PDU.
According to the first example of the present invention, in this rlc layer current, the message queue of buffer memory is as shown in table 1 below, and wherein, described sequence number represents the storage order of RLC buffer area:
Table 1
Wherein, the second receiving system receives the information Msg1 to be sent from PDCP layer entity, and indicates this information Msg1 to be sent to be the indication information of PDCP status PDU.According to indication information, the first sub-determining device then in rlc layer entity determines that it sends priority is the second priority, and, received Msg1 is encapsulated as a SDU by the second sub-determining device accordingly, and carry out buffer memory based on its transmission priority, to obtain new message queue as shown in table 2-1:
Table 1-1
Then, the second sub-determining device, based on the sequence number in table 1-1, transmits each RLC data cell successively.
According to the second example of the present invention, the second receiving system receives the information Msg2 to be sent from PDCP layer entity, and indicates this information Msg2 to be sent to be the indication information needing the PDCP data PDU retransmitted.Then this Msg2 is encapsulated as corresponding SDU by rlc layer entity, and places it in buffer area after RLC control PDU, all do not comprise other SDU of data retransmission before.And send each RLC data cell successively according to the storage order in buffer area.
According to the solution of the present invention, PDCP status data grouped element and PDCP data packet units are retransmitted and is optimized, by arranging for the much information in PDCP layer the indication information being used to indicate its corresponding transmission sequence, thus make rlc layer can prioritised transmission PDCP layer needs retransmit PDCP data PDU and PDCP status PDU, thus in the loss of data caused due to Xn interface, or the transmission path of user changes as there is reshuffling of radio bearer in dual link system, user guarantees when carrying out mobile handoff and the change of prothetic group station that the customizing messages of PDCP layer can be transferred in corresponding equipment as early as possible.Improve efficiency and the accuracy of information transmission.
With reference to Fig. 3.Illustrate according to a flow chart for the method for transmission information in dual link system of the present invention.According to method of the present invention, comprise the step S11 performed by PDCP layer entity and the step S21 performed by rlc layer entity and step S22.
Wherein, described PDCP layer entity and its corresponding rlc layer entity are contained in the equipment of dual link system.Preferably, described PDCP layer entity and corresponding rlc layer entity thereof are all contained in the same equipment of described dual link system.
With reference to Fig. 3, in step s 11, information to be sent and the indication information corresponding with it are sent to the rlc layer corresponding with described PDCP layer by PDCP layer entity.
Wherein, described information to be sent comprises needs are sent to its corresponding RLC entity information by PDCP layer entity.Preferably, described information to be sent comprises following at least any one type:
1) PDCP status PDU (i.e. PDCP status PDU, or be called PDCP control PDU or PDCP control PDU);
2) PDCP data PDU(and the PDCP data PDU of re-transmission is needed).
Wherein, described indication information is used to indicate described rlc layer entity to determine the transmission sequence of described information to be sent.
Preferably, described indication information comprise following any one:
1) type information of described information to be sent; Such as, PDCP status PDU type, the PDCP data PDU type etc. of re-transmission;
2) the transmission priority of described information to be sent in corresponding rlc layer.Preferably, the transmission priority that described PDCP status PDU is corresponding is higher than the transmission priority of the PDCP dataPDU of described re-transmission.
According to a preferred embodiment of the present invention, described information to be sent comprises PDCP statusPDU, also comprises step S12(figure do not show according to the inventive method).
In step s 12, when meeting preset trigger condition, PDCP layer entity assembles described PDCPstatus PDU, and determines the indication information corresponding with described PDCP status PDU.
Wherein, described preset trigger condition includes but not limited to following at least any one:
1) scheduled time condition; Wherein, described scheduled time condition include but not limited to following any one:
I) predetermined time interval; Such as, namely trigger apparatus for assembling every the scheduled time and perform corresponding operation;
Ii) predetermined point of time, such as, when arriving Preset Time point, namely triggers apparatus for assembling and performs corresponding operation.
2) detect that the PDCP PDU caused due to Xn interface loses.Such as, for user plane structure 3C, in normal transmission process, when the receiving algorithm belonging to PDCP layer entity detects that data PDCP PDU loses, when can judge that the PDCP PDU that the Xn interface between MeNB and SeNB causes loses, trigger PDCP layer entity and perform corresponding operation; Again such as, when detecting that the data PDCP PDU number of loss exceedes threshold value, trigger PDCP layer entity executable operations.
3) predetermined signaling is received.
Wherein, described predetermined signaling includes but not limited to the predetermined all kinds of signalings that can trigger PDCP layer entity assembling PDCP status PDU.
Preferably, described predetermined signaling can comprise the signaling under plurality of application scenes.
Such as, in downlink transmission, described predetermined signaling includes but not limited to as received by the subscriber equipment of signaling recipient, from the RRC signaling of base station.
Preferably, described predetermined signaling includes but not limited to any one RRC signaling following:
I) the RRC signaling of (RB re-configuration) is reshuffled for radio bearer
In dual link communication system, three kinds of radio bearer types can be configured simultaneously, i.e. dominant base carrying, the carrying of prothetic group station and segmentation carrying, these three kinds of carryings can be re-equipped from a type and put (re-configuration) and become another type, in time reshuffling generation, data transfer path may change, therefore need to forward the PDCP PDU not transmitting or do not receive acknowledge message being stored in rlc layer, in order to optimize re-transmission, need to send PDCPstatus PDU to ask the re-transmission of these PDCP PDU.And in time reshuffling generation, dominant base can send reconfiguration information to user terminal by RRC signaling.
Such as, in descending dual link system, when a radio bearer from dominant base carrying be re-equipped be set to prothetic group station carrying time, PDCP layer entity will from corresponding with dominant base be switched to this prothetic group station corresponding, after then user terminal is recovered to and reshuffles signaling RRC re-configuration accordingly, PDCP layer entity is instructed to produce PDCP status PDU, and to the target BS that needs switch to, that is this prothetic group station sends this PDCP status PD produced.
Ii) for the RRC signaling of the mobile handoff (mobility) between MeNB
In dual link system, user switches to another dominant base scene from a dominant base can be there is.Such as, according to the conclusion in present 3GPP standardization, when user switches to another dominant base from a dominant base, the data at prothetic group station can pass to source dominant base, and then the PDCP PDU not transmitting or do not receive acknowledge message at source dominant base and prothetic group station will be forwarded to target dominant base.In order to optimize re-transmission, need the re-transmission that PDCP status PDU comes for these PDCP PDU of target dominant base request.And in time switching generation, dominant base can send handover information to user terminal by RRC signaling.
Iii) the RRC signaling of (SeNB change) is changed in dual link system for prothetic group station, the scene that the prothetic group station that user can occur changes.Such as, for user plane 1A structure, when prothetic group station changes, the PDCP PDU not transmitting or do not receive acknowledge message at prothetic group station, source directly or can be transmitted to target prothetic group station by dominant base.In order to optimize re-transmission, need to send the re-transmission that PDCP status PDU comes for these PDCP PDU of the auxiliary base station requests of target, and when prothetic group station change occur time, dominant base can send prothetic group station change information to user terminal by RRC signaling.
Wherein, those skilled in the art will be understood that; corresponding with above-mentioned downlink transmission, trigger apparatus for assembling executable operations based on the one or more signalings in uplink transmission process situation also should be contained in protection scope of the present invention, does not repeat them here.
According to a preferred version of the present embodiment, preset trigger condition comprises and receives predetermined signaling, also comprise step S13(figure according to method of the present invention not show), described step S12 comprises step S121(figure and does not show), described step S11 comprises step S111(figure and does not show).
In step s 13, PDCP layer entity, according to described predetermined signaling, determines described PDCPstatus PDU target device extremely to be sent.
In step S121, when receiving predetermined signaling, described PDCP layer entity assembles described PDCP status PDU, and determines the indication information corresponding with described PDCP status PDU.
Preferably, the assembling of PDCP layer entity is sent to the PDCP status PDU of this target device, and determines the indication information corresponding with described PDCP status PDU.
Then, in step S111, the indication information of described PDCP status PDU and correspondence thereof is sent to the rlc layer corresponding with this target device by described PDCP layer entity.
According to the first example of the present invention, when subscriber equipment receives the RRC reconfiguration information from dominant base eNB_1, PDCP layer entity is according to received reconfiguration information, determine the target BS eNB_2 needing this PDCP status PDU to be sent to, then namely PDCP layer entity starts to assemble the PDCP status PDU be sent to needed for this target BS eNB_2, and according to predetermined corresponding relation, determine the indication information Ind_1 corresponding with this PDCP status PDU.Then, this PDCP status PDU is sent to the rlc layer corresponding with this target BS eNB_2 by dispensing device.
According to a preferred embodiment of the present invention, described information to be sent comprises the PDCP data PDU that needs retransmit, according to method of the present invention also comprise step S14(figure do not show) and step S15(figure do not show), described step S11 comprise further step S112(schemes do not show).
In step S14, PDCP layer entity receives the PDCPstatus PDU from peer devices feedback.
In step S15, PDCP layer entity determines the PDCP data PDU that needs again to transmit and corresponding indication information thereof according to received PDCP status PDU.
Then, in step S112, the indication information of described PDCP data PDU and correspondence thereof is sent to described rlc layer by PDCP layer entity.
Then, in the step s 21, rlc layer entity receives from the information to be sent of the PDCP layer corresponding to described rlc layer and corresponding indication information thereof.
Then, in step S22, according to described indication information, rlc layer entity determines that the transmission sequence of described information to be sent is to transmit.
Particularly, rlc layer entity determines the buffer memory order of described information to be sent according to described indication information, and described buffer memory order is transmitted as transmission sequence.
Preferably, rlc layer entity, according to the indication information of described information to be sent, determines the transmission priority corresponding with this indication information; Then, rlc layer entity, according to described transmission priority, determines the memory sequencing of this information to be sent in RLC buffer memory, to transmit corresponding every terms of information successively based on described memory sequencing.
Wherein, rlc layer entity, according to described transmission priority, determines the memory sequencing of at least one RLC SDU in RLC buffer memory that information to be sent with this is corresponding, to transmit corresponding every terms of information successively based on described memory sequencing.
Wherein, described transmission priority is used to indicate needs the preferential information sent.
Preferably, for the information with identical transmission priority, the second sub-determining device determines its buffer memory order based on time sequencing.
Preferably, the configuration of described rlc layer entity comprises following transmission priority rule:
In rlc layer, common PDCP data PDU will follow sequential delivery rule, and, first-in first-out rule.PDCP status PDU will walk around sequencer procedure, and with the form of RLC SDU, before being placed in all PDCP data PDU in buffer area, and to be used for transmission after other PDCP status PDU.After receiving scheduling authorization, rlc layer is by the specific transmission opportunity notified by lower layer entities, obtain the size of all RLC PDU indicated by low layer, and form RLC PDU by first these PDCP status PDU (because it is at the buffer area head of RLC) being put into RLC PDU.
Preferably, the transmission priority of each data cell is as follows: the RLC data PDU > that RLC data PDU > that is that RLC control PDU > retransmits or that comprise re-transmission segmentation comprises PDCP status PDU comprises the RLC data PDU of PDCP data PDU.
According to the first example of the present invention, in this rlc layer current, the message queue of buffer memory is as shown in table 2 below, and wherein, described sequence number represents the storage order of RLC buffer area:
Table 2
Wherein, rlc layer entity receives the information Msg1 to be sent from PDCP layer entity, and indicates this information Msg1 to be sent to be the indication information of PDCP status PDU.Then according to indication information, rlc layer entity determines that it sends priority is the second priority, and received Msg1 is encapsulated as a SDU accordingly, and carries out buffer memory based on its transmission priority, to obtain new message queue as shown in table 2-1:
Table 2-1
Then, rlc layer entity, based on the sequence number in table 2-1, transmits each RLC data cell successively.
According to the second example of the present invention, rlc layer entity receives the information Msg2 to be sent from PDCP layer entity, and indicates this information Msg2 to be sent to be the indication information needing the PDCP data PDU retransmitted.Then this Msg2 is encapsulated as corresponding SDU by rlc layer entity, and places it in buffer area after RLC control PDU, all do not comprise other SDU of data retransmission before.And send each RLC data cell successively according to the storage order in buffer area.
According to the solution of the present invention, PDCP status data grouped element and PDCP data packet units are retransmitted and is optimized, by arranging for the much information in PDCP layer the indication information being used to indicate its corresponding transmission sequence, thus make rlc layer can prioritised transmission PDCP layer needs retransmit PDCP data PDU and PDCP status PDU, thus in the loss of data caused due to Xn interface, or the transmission path of user changes as there is reshuffling of radio bearer in dual link system, user guarantees when carrying out mobile handoff and the change of prothetic group station that the customizing messages of PDCP layer can be transferred in corresponding equipment as early as possible.Improve efficiency and the accuracy of information transmission.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.Any Reference numeral in claim should be considered as the claim involved by limiting.In addition, obviously " comprising " one word do not get rid of other unit or step, odd number does not get rid of plural number.Multiple unit of stating in system claims or device also can be realized by software or hardware by a unit or device.First, second word such as grade is used for representing title, and does not represent any specific order.
Claims (15)
1. a PDCP layer entity, wherein, described PDCP layer entity is contained in the equipment of dual link system, and described PDCP layer entity comprises:
Dispensing device, for information to be sent and the indication information corresponding with it are sent to the rlc layer corresponding with described PDCP layer, wherein, described indication information is used to indicate described rlc layer entity to determine the transmission sequence of described information to be sent.
2. PDCP layer entity according to claim 1, wherein, described information to be sent comprises PDCP status PDU, and wherein, described PDCP layer entity also comprises:
Apparatus for assembling, for when meeting preset trigger condition, assembles described PDCP status PDU, and determines the indication information corresponding with described PDCP status PDU;
Wherein, described dispensing device is further used for:
-indication information of described PDCP status PDU and correspondence thereof is sent to described rlc layer.
3. PDCP layer entity according to claim 2, wherein, described preset trigger condition comprise following at least any one:
-scheduled time condition;
-receive predetermined signaling;
-detect that the PDCP PDU caused due to Xn interface loses.
4. PDCP layer entity according to claim 3, wherein, described preset trigger condition comprises and receives predetermined signaling, and wherein, described PDCP layer entity also comprises:
First determining device, for according to described predetermined signaling, determines described PDCP status PDU target device extremely to be sent;
Wherein, described apparatus for assembling is further used for:
-when receiving predetermined signaling, assemble described PDCP status PDU, and determine the indication information corresponding with described state information.
5. PDCP layer entity according to claim 1, wherein, described information to be sent comprises the PDCP data PDU that needs retransmit, and wherein, described PDCP layer entity also comprises:
First receiving device, for receiving the PDCP status PDU from peer devices feedback;
Second determining device, for the PDCP data PDU that determines to need again to transmit according to received PDCP status PDU and corresponding indication information thereof;
Wherein, described dispensing device comprises further:
-indication information of described PDCP data PDU and correspondence thereof is sent to described rlc layer.
6. a rlc layer entity, wherein, described rlc layer entity is contained in the equipment of dual link system, and described rlc layer entity comprises:
Second receiving system, for receiving information to be sent from the PDCP layer corresponding to described rlc layer and corresponding indication information thereof;
3rd determining device, for determining that according to described indication information the transmission sequence of described information to be sent is to transmit.
7. rlc layer entity according to claim 6, wherein, described 3rd determining device comprises further:
First sub-determining device, for the indication information according to described information to be sent, determines the transmission priority corresponding with this indication information;
Second sub-determining device, for according to described transmission priority, determines the memory sequencing of this information to be sent in RLC buffer memory, to transmit corresponding every terms of information successively based on described memory sequencing.
8. the rlc layer entity according to claim 6 and 7, wherein, the configuration of described rlc layer entity comprises following transmission priority rule: the RLC data PDU > that RLC data PDU > that is that RLC control PDU > retransmits or that comprise re-transmission segmentation comprises PDCP status PDU comprises the RLC data PDU of PDCP data PDU.
9. in PDCP layer entity for a method for transmission information, wherein, described PDCP layer entity is contained in the equipment of dual link system, said method comprising the steps of:
Information to be sent and the indication information corresponding with it are sent to the rlc layer corresponding with described PDCP layer by a, and wherein, described indication information is used to indicate described rlc layer entity to determine the transmission sequence of described information to be sent.
10. method according to claim 9, wherein, described information to be sent comprises state information, and wherein, described method is further comprising the steps of:
X, when meeting preset trigger condition, assembles described PDCP status PDU, and determines the indication information corresponding with described PDCP status PDU;
Wherein, described step a comprises the following steps:
-indication information of described PDCP status PDU and correspondence thereof is sent to described rlc layer.
11. methods according to claim 10, wherein, described preset trigger condition comprises and receives predetermined signaling, and wherein, described step x comprises the following steps:
-when receiving predetermined signaling, assemble described PDCP status PDU, and determine the indication information corresponding with described PDCP status PDU;
Wherein, described method is further comprising the steps of:
-according to described predetermined signaling, determine described PDCP status PDU target device extremely to be sent.
12. methods according to claim 9, wherein, described information to be sent comprises retransmission information, and wherein, described method is further comprising the steps of:
-receive the PDCP status PDU fed back from opposite equip.;
-determine the PDCP data PDU that needs again to transmit and corresponding indication information thereof according to received PDCP status PDU;
Wherein, described step a comprises the following steps:
-indication information of described PDCP data PDU and correspondence thereof is sent to described rlc layer.
13. 1 kinds in rlc layer entity for the method for transmission information, wherein, described rlc layer entity is contained in the equipment of dual link system, said method comprising the steps of:
A receives from the information to be sent of the PDCP layer corresponding to described rlc layer and corresponding indication information thereof;
According to described indication information, B determines that the transmission sequence of described information to be sent is to transmit.
14. methods according to claim 13, wherein, described step B comprises the following steps:
-according to the indication information of described information to be sent, determine the transmission priority corresponding with this indication information;
-according to described transmission priority, determine the memory sequencing of this information to be sent in RLC buffer memory, to transmit corresponding every terms of information successively based on described memory sequencing.
15. 1 kinds of equipment, wherein, described equipment comprises the PDCP layer entity as described in claim 1 to 5 and/or rlc layer entity as claimed in claims 6 or 7.
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