CN104935414B - A kind of method and apparatus for transmitting information in doubly-linked welding system - Google Patents
A kind of method and apparatus for transmitting information in doubly-linked welding system Download PDFInfo
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- CN104935414B CN104935414B CN201410109925.XA CN201410109925A CN104935414B CN 104935414 B CN104935414 B CN 104935414B CN 201410109925 A CN201410109925 A CN 201410109925A CN 104935414 B CN104935414 B CN 104935414B
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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
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The method and apparatus that the purpose of the present invention is to provide a kind of to transmit information in doubly-linked welding system.A kind of PDCP layer entity according to the present invention, wherein, the PDCP layer entity is contained in the equipment of doubly-linked welding system, the PDCP layer entity includes: sending device, for information to be sent and corresponding instruction information to be sent to and the PDCP layers of corresponding rlc layer, wherein, the instruction information is used to indicate the rlc layer entity to determine the transmission sequence of the information to be sent.The invention has the advantages that PDCP status data grouped element and the re-transmission of PDCP data packet units are optimized, PDCP PDU can be made to be transmitted as early as possible.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of methods and dress that information is transmitted in doubly-linked welding system
It sets.
Background technique
With the continuous development of the communication technology, improved communication is continually developed on the basis of original architectures of communication networks
System can provide more convenient and efficiently data communication services for user.
Doubly-linked welding system is a kind of improvement communication system proposed.In doubly-linked welding system, user terminal can be with
Two (or more) base stations carry out uplink communication and downlink communication simultaneously.Two communicated with user terminal
(or more) in base station, there are a master base stations, the communication of doubly-linked welding system can be managed, and remaining base station is prothetic group
It stands.
In the doubly-linked welding system for supporting 3C user plane framework, Packet Data Convergence Protocol (PDCP, Packet Data
Convergence Protocol) Packet Data Unit (PDU, Packet Data Unit) in master base station (MeNB, Master
ENB be created in), and part is transmitted to prothetic group station, by different paths, such as by master base station and prothetic group station (SeNB,
Secondary eNB) it is transmitted to user.When transmitting between MeNB and SeNB by Xn interface number may occur for PDCP PDU
According to packet loss, therefore user's transmission PDCP status PDU is also required in normal transmission process and carrys out request retransmission,
Except this, in the case where transmission path variation occurs in doubly-linked welding system, it is also desirable to send PDCP status PDU to subtract
It is retransmitted less with optimization.For example, data transfer path may change when radio bearer reconfigures, it is therefore desirable to which forwarding is simultaneously
The PDCP PDU for not transmitting or not receiving confirmation message for having stored in rlc layer is retransmitted, just needs to send PDCP shape at this time
State PDU reduces and optimizes re-transmission；In another example, according to the conclusion in present 3GPP standardization, working as user in doubly-linked welding system
When switching to another master base station from a master base station, the data at prothetic group station can be transmitted to source master base station, then source master base station and prothetic group station
The PDCP PDU for not transmitting or not receiving confirmation message will be forwarded to target master base station.It is also required to optimization weight at this time
It passes.For another example, when prothetic group station changes, not transmitting or not receiving confirmation for source prothetic group station disappears for user plane 1A structure
The PDCP PDU of breath can direct or through master base station and be transmitted to target prothetic group station.Optimization is also needed at this time to retransmit.
Therefore, it in doubly-linked welding system, needs to send PDCP status PDU counterweight biography and optimizes, it is corresponding to retransmit
PDCP PDU。
In the prior art, in MAC layer, can ACK/NACK information by timing transmission as feedback information, come true
It protects feedback information to be received as early as possible, in rlc layer, for affirmation mode RLC entity, by sending RLC control protocol data cell
(PDU, Protocol data unit) is used as feedback information request retransmission, which controls PDU ratio RLC data PDU with higher
Priority send, to ensure that feedback message is received as early as possible.
However, in conventional systems, PDCP status PDU is only transmitted in reconstruction process (reestablishment).Institute
To transmit the chance very little of PDCP status PDU.But in doubly-linked welding system, transmission PDCP state is required in these cases
PDU.Also, in doubly-linked welding system, rlc layer would generally cache the data to be transmitted such as a large amount of, for example, SeNB can be used for point
The business with mass data is flowed, which will be cached in RLC；In another example based on current buffer status report
Table (BSR, Buffer Status Report), buffer area maximum can reach 3000000 bytes, that is, may storage in rlc layer
The data of 3000000 bytes；In addition, for 3C framework, PDCP buffer area is greater than legacy system, so that its reply is non-ideal
Round-trip delay and transmission from two base stations, correspondingly, this requires the buffer area of rlc layer also bigger than legacy system.Cause
This, needs to discuss to improved PDCP function, to solve the problems, such as quickly to transmit PDCP status PDU.
Also, it in the prior art, retransmits (re-transmission) and occurs over just reconstruction (re-establishment)
In the process, since the caching of rlc layer when rebuilding can empty, the PDCP PDU for needing to retransmit at this time is stored in RLC naturally
The queue front of layer data to be sent, so as to transmit these PDU as early as possible.However, during dual link, even if common
It under transmission mode, can also retransmit, then can not transmit these needs as early as possible since RLC caches not corresponding emptying at this time
The PDCP PDU of re-transmission.This is also urgent problem.
Summary of the invention
The method and apparatus that the object of the present invention is to provide a kind of to transmit information in doubly-linked welding system.
According to an aspect of the present invention, a kind of PDCP layer entity is provided, wherein the PDCP layer entity is contained in doubly-linked
In the equipment of welding system, the PDCP layer entity includes:
Sending device, it is corresponding with described PDCP layers for being sent to information to be sent and corresponding instruction information
Rlc layer, wherein the instruction information is used to indicate the rlc layer entity to determine the transmission sequence of the information to be sent.
According to an aspect of the present invention, a kind of rlc layer entity is additionally provided, wherein the rlc layer entity is contained in double
In the equipment of connection system, the rlc layer entity includes:
Second reception device, for receiving from PDCP layers corresponding to the rlc layer of information to be sent and its corresponding
Instruction information；
Third determining device, for determining the transmission sequence of the information to be sent to carry out according to the instruction information
Transmission.
According to an aspect of the present invention, one kind method for transmitting information in PDCP layer entity is additionally provided,
In, the PDCP layer entity is contained in the equipment of doubly-linked welding system, it the described method comprises the following steps:
Information to be sent and corresponding instruction information are sent to and the PDCP layers of corresponding RLC by step a
Layer, wherein the instruction information is used to indicate the rlc layer entity to determine the transmission sequence of the information to be sent.
According to an aspect of the present invention, one kind method for transmitting information in rlc layer entity is additionally provided,
In, the rlc layer entity is contained in the equipment of doubly-linked welding system, it the described method comprises the following steps:
Step A, receive from PDCP layers corresponding with the rlc layer information to be sent and its corresponding indicate information；
Step B determines the transmission sequence of the information to be sent to be transmitted according to the instruction information.
According to an aspect of the present invention, a kind of equipment is additionally provided, wherein the equipment includes the PDCP layer entity
And/or the rlc layer entity.
Compared with prior art, the invention has the following advantages that PDCP status data grouped element and PDCP data point
Group unit retransmissions are optimized, by the finger for being used to indicate its corresponding transmission sequence for the much information setting in PDCP layers
Show information, so that PDCP data PDU and the PDCP status PDU that the needs that rlc layer can be PDCP layers of prioritised transmission retransmit, from
And in the loss of data as caused by Xn interface, or in doubly-linked welding system, the transmission path of user changes as nothing occurs
The reconfiguring of line carrying, user carries out ensuring that PDCP layers of specific information can be by as early as possible when mobile handoff and prothetic group station change
It is transmitted in corresponding equipment.Improve the efficiency and accuracy of information transmission.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, of the invention other
Feature, objects and advantages will become more apparent upon:
Fig. 1 illustrates the schematic diagram of communication system according to an embodiment of the invention；
Fig. 2 illustrates the structural representation of the one according to the present invention device for transmitting information in doubly-linked welding system
Figure；
Fig. 3 illustrates the flow chart of the one according to the present invention method for transmitting information in doubly-linked welding system；
The same or similar appended drawing reference represents the same or similar component in attached drawing.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing.
Referring to Fig.1, Fig. 1 illustrates a doubly-linked welding system according to the present invention.Wherein, the doubly-linked welding system includes
Multiple equipment.Wherein, the multiple equipment includes at least one master base station, at least one prothetic group station corresponding with the master base station,
And at least one user equipment.Wherein, which can connect with a master base station and a prothetic group station simultaneously, also that is, the use
Dual link may be present between family equipment and a master base station and a prothetic group station.
Wherein, each equipment in the multiple equipment of the doubly-linked welding system includes PDCP layer entity and/or RLC entity
Layer.
Referring to Fig. 2.Fig. 2 illustrates the one according to the present invention device for transmitting information in doubly-linked welding system
Structural schematic diagram.Wherein, PDCP layer entity according to the present invention and its corresponding rlc layer entity are contained in double respectively
In the equipment of connection system.
Preferably, the PDCP layer entity and its corresponding rlc layer entity can be contained in the doubly-linked welding system simultaneously
In the same equipment.
Wherein, PDCP layer entity according to the present invention includes sending device 11, and rlc layer entity includes the second reception device 21
With third determining device 22.
Referring to Fig. 2, the sending device in PDCP layer entity sends information to be sent and corresponding instruction information
To with the PDCP layers of corresponding rlc layer.
Wherein, the information to be sent includes the information for needing to be sent to its corresponding RLC entity by PDCP layer entity.It is excellent
Selection of land, the information to be sent include at least any one following type:
1) (i.e. PDCP status PDU, or referred to as PDCP control PDU or PDCP control to PDCP status PDU
PDU)；
2) the PDCP data PDU (i.e. PDCP data PDU) for needing to retransmit.
Wherein, the instruction information is used to indicate the rlc layer entity to determine the transmission sequence of the information to be sent.
Preferably, the instruction information includes following any:
1) type information of the information to be sent；For example, PDCP status PDU type, the PDCP data of re-transmission
PDU type etc.；
2) transmission priority of the information to be sent in corresponding rlc layer.Preferably, the PDCP status
The corresponding transmission priority for sending priority and being higher than the PDCP data PDU of the re-transmission of PDU.
According to a preferred embodiment of the present invention, the information to be sent includes PDCP status PDU, according to this hair
Bright PDCP layer entity further includes assembling device (not shown).
When meeting preset trigger condition, assembling device assembles the PDCP status PDU, and the determining and PDCP
The corresponding instruction information of status PDU.
Wherein, the preset trigger condition includes but is not limited to following at least any one:
1) predetermined time condition；Wherein, the predetermined time condition includes but is not limited to any of the following:
I) predetermined time interval；For example, i.e. triggering assembling device executes corresponding operation at predetermined time intervals；
Ii) predetermined point of time, for example, i.e. triggering assembling device executes corresponding operation when reaching preset time point.
2) detect that the PDCP PDU as caused by Xn interface loses.For example, normally being passed for user plane structure 3C
During defeated, the receiving algorithm belonging to the PDCP layer entity detects that data PDCP PDU loses, that is, can determine whether be MeNB with
When PDCP PDU caused by Xn interface between SeNB loses, triggering assembling device executes corresponding operation；In another example working as detection
To loss data PDCP PDU number be more than threshold value when, triggering assembling device execute operation.
3) predetermined signaling is received.
Wherein, the predetermined signaling includes but is not limited to predetermined triggerable assembling device assembling PDCP status PDU
All kinds of signalings.
Preferably, the predetermined signaling may include the signaling under plurality of application scenes.
For example, the predetermined signaling includes but is not limited to that the user of signaling recipient is used as to set in downlink transmission
Standby received, the RRC signaling from base station.
Preferably, the predetermined signaling includes but is not limited to any of the following RRC signaling:
I) RRC signaling of (RB re-configuration) is reconfigured for radio bearer
In dual link communication system, three kinds of radio bearer types can be configured simultaneously, i.e. master base station carries, and prothetic group station is held
It carries and segmentation carrying, these three carryings can be reconfigured into (re-configuration) into another class from a seed type
Type, when reconfiguring generation, data transfer path may change, it is therefore desirable to which forwarding has stored in rlc layer
The PDCP PDU of confirmation message is not transmitted or do not received, is retransmitted to optimize, is needed to send PDCP status PDU to request
The re-transmission of these PDCP PDU.And when reconfiguring generation, master base station can by RRC signaling send reconfiguration information to
User terminal.
For example, in downlink doubly-linked welding system, when a radio bearer from master base station carrying be reconfigured into supplemented by base station carry
When, PDCP layer entity will be switched to prothetic group station from master base station, then user terminal is recovered to reconfigures signaling RRC re- accordingly
After configuration, PDCP layer entity is instructed to generate PDCP status PDU, and the target BS switched to needs, also
I.e. the prothetic group station sends the generated PDCP status PD.
Ii) the RRC signaling for the mobile handoff (mobility) between MeNB
In doubly-linked welding system, it may occur that user switches to the scene of another master base station from a master base station.For example, according to existing
Conclusion in 3GPP standardization, when user switches to another master base station from a master base station, the data at prothetic group station can be transmitted to source
Master base station, then source master base station and the PDCP PDU for not transmitting or not receiving confirmation message at prothetic group station will be forwarded to mesh
Mark master base station.It is retransmitted to optimize, needs to send PDCP status PDU to request these PDCP PDU's to target master base station
It retransmits.And when switching generation, master base station can send handover information to user terminal by RRC signaling.
Iii) change the RRC signaling of (SeNB change) in doubly-linked welding system for prothetic group station, it may occur that user's is auxiliary
The scene that base station changes.For example, for user plane 1A structure, when prothetic group station changes, source prothetic group station is not transmitted or not
The PDCP PDU for receiving confirmation message can direct or through master base station and be transmitted to target prothetic group station.It retransmits, needs to optimize
It sends PDCP status PDU and carrys out the re-transmission to these PDCP PDU of the auxiliary base station requests of target, and occur when prothetic group station changes
When, master base station can be sent prothetic group station by RRC signaling and change information to user terminal.
Wherein, those skilled in the art will be understood that it is corresponding with above-mentioned downlink transmission, based on uplink transmit
One or more signalings in process should also be contained in protection scope of the present invention to trigger the case where assembling device executes operation
Interior, details are not described herein.
According to the present embodiment preferred embodiment, institute's preset trigger condition includes receiving predetermined signaling, then described
PDCP layer entity further includes the first determining device (not shown).
First determining device, for determining the mesh that the PDCP status PDU is sent to according to the predetermined signaling
Marking device.
At this point, when receiving predetermined signaling, the assembling device assembles the PDCP status PDU, and determine with
The corresponding instruction information of the PDCP status PDU.
Preferably, assembling device assembles the PDCP status PDU for being sent to the target device, and it is determining with it is described
The corresponding instruction information of PDCP status PDU.
Then, the PDCP status PDU and its corresponding instruction information are sent to and the mesh by the sending device
The corresponding rlc layer of marking device.
First example according to the present invention, when user equipment receives the RRC reconfiguration information from master base station eNB_1
When, the first determining device reconfiguration information based on the received needs for the PDCP status PDU to be sent to determine
Target BS eNB_2, then assembling device starts PDCP status PDU needed for assembling is sent to target BS eNB_2, and root
According to predetermined corresponding relationship, instruction information Ind_1 corresponding with the PDCP status PDU is determined.Then, sending device is by the PDCP shape
State PDU is sent to rlc layer corresponding with target BS eNB_2.
According to a preferred embodiment of the present invention, the information to be sent includes the PDCP data PDU for needing to retransmit, root
It further include first receiving device (not shown) and the second reception device (not shown) according to PDCP layer entity of the invention.
Wherein, first receiving device receives the PDCP status PDU fed back from opposite equip..
PDCP status PDU determines the PDCP data for needing to transmit again to second determining device based on the received
PDU and its information is indicated accordingly.
Then, the PDCP data PDU and its corresponding instruction information are sent to the rlc layer by sending device.
Then, the second reception device in rlc layer entity receives to be sent from PDCP layers corresponding with the rlc layer
Information and its information is indicated accordingly.
Then, third determining device determines the transmission sequence of the information to be sent to carry out according to the instruction information
Transmission.
Specifically, third determining device determines the caching sequence of the information to be sent according to the instruction information, and
It is used as transmission sequence to transmit the caching sequence.
Preferably, the sub- determining device (not shown) of first be contained in third determining device is according to the information to be sent
Instruction information, determine corresponding with instruction information transmission priority；Then, the second son being contained in third determining device
Determining device determines memory sequencing of the information to be sent in RLC caching according to the transmission priority, to be deposited based on described
Corresponding every terms of information is successively transmitted in storage sequence.
Wherein, the second sub- determining device determines corresponding with the information to be sent at least one according to the transmission priority
Memory sequencing of a RLC SDU in RLC caching, successively to transmit corresponding every terms of information based on the memory sequencing.
Wherein, the transmission priority is used to indicate the information for needing preferentially to send.
Preferably for the information having the same for sending priority, the second sub- determining device is chronologically-based next true
Fixed its caching sequence.
Preferably, include following transmission priority rule in the configuration of the rlc layer entity:
In rlc layer, common PDCP data PDU will comply with sequential delivery rule, and, first-in first-out rule.PDCP shape
State PDU will bypass sequencer procedure, and in the form of RLC SDU, be placed in front of all PDCP data PDU in buffer area,
With other PDCP status PDUs later to be used to transmit.After receiving scheduling authorization, rlc layer will notified by lower layer entities
Specific transmission chance, obtains the size of all RLC PDU indicated by low layer, and by first by these PDCP status PDUs (due to
It is on the buffer area head of RLC) it is put into RLC PDU and forms RLC PDU.
Preferably, the priority rule: RLC controls PDU > the is retransmitted or RLC data PDU comprising retransmitting segmentation
> includes that the RLC data PDU > of PDCP status PDU includes the RLC data PDU of PDCP data PDU.
First example according to the present invention, the message queue currently cached in the rlc layer are as shown in table 1 below, wherein institute
Stating serial number indicates the storage order of RLC buffer area:
Table 1
Wherein, the second reception device receives the information Msg1 to be sent from PDCP layer entity, and indicates that this is pending
The breath Msg1 that delivers letters is the instruction information of PDCP status PDU.Then the first sub- determining device in rlc layer entity is believed according to instruction
It is the second priority that breath, which determines that it sends priority, also, the second sub- determining device encapsulates received Msg1 accordingly
For a SDU, and priority is sent based on it and is cached, to obtain new message queue as shown in table 2-1:
Table 1-1
Then, the second sub- determining device is based on the serial number in table 1-1, successively transmits each RLC data cell.
Second example according to the present invention, the second reception device receive the information to be sent from PDCP layer entity
Msg2, and indicate that the information Msg2 to be sent is the instruction information for needing the PDCP data PDU retransmitted.Then rlc layer entity will
The Msg2 is encapsulated as corresponding SDU, and places it in buffer area after RLC control PDU, all not include its for retransmitting data
Before his SDU.And each RLC data cell is successively sent according to the storage order in buffer area.
According to the solution of the present invention, PDCP status data grouped element and the re-transmission of PDCP data packet units have been carried out excellent
Change, by being used to indicate the instruction information of its corresponding transmission sequence for the much information setting in PDCP layers, so that RLC
Layer can be PDCP layers of prioritised transmission PDCP data PDU and the PDCP status PDU that retransmits of needs, to be caused due to Xn interface
Loss of data, or the transmission path of user changes as the reconfiguring of radio bearer occurs, uses in doubly-linked welding system
Family carries out ensuring that PDCP layers of specific information can be transmitted to corresponding equipment as early as possible when mobile handoff and the change of prothetic group station
In.Improve the efficiency and accuracy of information transmission.
Referring to Fig. 3.Illustrate the stream of the one according to the present invention method for transmitting information in doubly-linked welding system
Cheng Tu.According to the method for the present invention, include the steps that the step S21 for executing S11 by PDCP layer entity and being executed by rlc layer entity
With step S22.
Wherein, the PDCP layer entity and its corresponding rlc layer entity are contained in the equipment of doubly-linked welding system.It is preferred that
Ground, the PDCP layer entity and its corresponding rlc layer entity are both contained in the same equipment of the doubly-linked welding system.
Referring to Fig. 3, in step s 11, PDCP layer entity sends information to be sent and corresponding instruction information
To with the PDCP layers of corresponding rlc layer.
Wherein, the information to be sent includes the information for needing to be sent to its corresponding RLC entity by PDCP layer entity.It is excellent
Selection of land, the information to be sent include at least any one following type:
1) (i.e. PDCP status PDU, or referred to as PDCP control PDU or PDCP control to PDCP status PDU
PDU)；
2) the PDCP data PDU (i.e. PDCP data PDU) for needing to retransmit.
Wherein, the instruction information is used to indicate the rlc layer entity to determine the transmission sequence of the information to be sent.
Preferably, the instruction information includes following any:
1) type information of the information to be sent；For example, PDCP status PDU type, the PDCP data of re-transmission
PDU type etc.；
2) transmission priority of the information to be sent in corresponding rlc layer.Preferably, the PDCP status
The corresponding transmission priority for sending priority and being higher than the PDCP data PDU of the re-transmission of PDU.
According to a preferred embodiment of the present invention, the information to be sent includes PDCP status PDU, according to this hair
Bright method further includes step S12 (not shown).
In step s 12, when meeting preset trigger condition, PDCP layer entity assembles the PDCP status PDU, and
Determine instruction information corresponding with the PDCP status PDU.
Wherein, the preset trigger condition includes but is not limited to following at least any one:
1) predetermined time condition；Wherein, the predetermined time condition includes but is not limited to any of the following:
I) predetermined time interval；For example, i.e. triggering assembling device executes corresponding operation at predetermined time intervals；
Ii) predetermined point of time, for example, i.e. triggering assembling device executes corresponding operation when reaching preset time point.
2) detect that the PDCP PDU as caused by Xn interface loses.For example, normally being passed for user plane structure 3C
During defeated, the receiving algorithm belonging to the PDCP layer entity detects that data PDCP PDU loses, that is, can determine whether be MeNB with
When PDCP PDU caused by Xn interface between SeNB loses, triggering PDCP layer entity executes corresponding operation；In another example working as inspection
When measuring the data PDCP PDU number of loss more than threshold value, triggering PDCP layer entity executes operation.
3) predetermined signaling is received.
Wherein, the predetermined signaling includes but is not limited to that predetermined triggerable PDCP layer entity assembles PDCP status PDU
All kinds of signalings.
Preferably, the predetermined signaling may include the signaling under plurality of application scenes.
For example, the predetermined signaling includes but is not limited to that the user of signaling recipient is used as to set in downlink transmission
Standby received, the RRC signaling from base station.
Preferably, the predetermined signaling includes but is not limited to any of the following RRC signaling:
I) RRC signaling of (RB re-configuration) is reconfigured for radio bearer
In dual link communication system, three kinds of radio bearer types can be configured simultaneously, i.e. master base station carries, and prothetic group station is held
It carries and segmentation carrying, these three carryings can be reconfigured into (re-configuration) into another class from a seed type
Type, when reconfiguring generation, data transfer path may change, it is therefore desirable to which forwarding has stored in rlc layer
The PDCP PDU of confirmation message is not transmitted or do not received, is retransmitted to optimize, is needed to send PDCP status PDU to request
The re-transmission of these PDCP PDU.And when reconfiguring generation, master base station can by RRC signaling send reconfiguration information to
User terminal.
For example, in downlink doubly-linked welding system, when a radio bearer from master base station carrying be reconfigured into supplemented by base station carry
When, PDCP layer entity will be switched to corresponding with the prothetic group station from corresponding with master base station, then user terminal is recovered to corresponding reconfiguration
After confidence enables RRC re-configuration, PDCP layer entity is instructed to generate PDCP status PDU, and switch to needs
Target BS, that is, the prothetic group station send caused by the PDCP status PD.
Ii) the RRC signaling for the mobile handoff (mobility) between MeNB
In doubly-linked welding system, it may occur that user switches to the scene of another master base station from a master base station.For example, according to existing
Conclusion in 3GPP standardization, when user switches to another master base station from a master base station, the data at prothetic group station can be transmitted to source
Master base station, then source master base station and the PDCP PDU for not transmitting or not receiving confirmation message at prothetic group station will be forwarded to mesh
Mark master base station.It is retransmitted to optimize, needs PDCP status PDU to request the weight of these PDCP PDU for target master base station
It passes.And when switching generation, master base station can send handover information to user terminal by RRC signaling.
Iii) change the RRC signaling of (SeNB change) in doubly-linked welding system for prothetic group station, it may occur that user's is auxiliary
The scene that base station changes.For example, for user plane 1A structure, when prothetic group station changes, source prothetic group station is not transmitted or not
The PDCP PDU for receiving confirmation message can direct or through master base station and be transmitted to target prothetic group station.It retransmits, needs to optimize
It sends PDCP status PDU to come for the re-transmission of these PDCP PDU of the auxiliary base station requests of target, and occurs when prothetic group station changes
When, master base station can be sent prothetic group station by RRC signaling and change information to user terminal.
Wherein, those skilled in the art will be understood that it is corresponding with above-mentioned downlink transmission, based on uplink transmit
One or more signalings in process should also be contained in protection scope of the present invention to trigger the case where assembling device executes operation
Interior, details are not described herein.
According to the present embodiment preferred embodiment, preset trigger condition includes receiving predetermined signaling, according to the present invention
Method further include step S13 (not shown), the step S12 includes step S121 (not shown), and the step S11 includes step
Rapid S111 (not shown).
In step s 13, PDCP layer entity determines that the PDCP status PDU is to be sent according to the predetermined signaling
Target device extremely.
In step S121, when receiving predetermined signaling, the PDCP layer entity assembles the PDCP status
PDU, and determine instruction information corresponding with the PDCP status PDU.
Preferably, PDCP layer entity assembling is sent to the PDCP status PDU of the target device, and it is determining with it is described
The corresponding instruction information of PDCP status PDU.
Then, in step S111, the PDCP layer entity believes the PDCP status PDU and its corresponding instruction
Breath is sent to rlc layer corresponding with the target device.
First example according to the present invention, when user equipment receives the RRC reconfiguration information from master base station eNB_1
When, PDCP layer entity reconfiguration information based on the received, to determine the mesh for needing to be sent to the PDCP status PDU
Base station eNB _ 2 are marked, then PDCP layer entity starts PDCP status PDU needed for assembling is sent to target BS eNB_2, and root
According to predetermined corresponding relationship, instruction information Ind_1 corresponding with the PDCP status PDU is determined.Then, sending device is by the PDCP shape
State PDU is sent to rlc layer corresponding with target BS eNB_2.
According to a preferred embodiment of the present invention, the information to be sent includes the PDCP data PDU for needing to retransmit, root
It further include step S14 (not shown) and step S15 (not shown) according to method of the invention, the step S11 further comprises step
Rapid S112 (not shown).
In step S14, PDCP layer entity receives the PDCP status PDU fed back from peer devices.
In step S15, PDCP status PDU is determined and is needed to transmit again PDCP layer entity based on the received
PDCP data PDU and its information is indicated accordingly.
Then, in step S112, the PDCP data PDU and its corresponding instruction information are sent to by PDCP layer entity
The rlc layer.
Then, in the step s 21, rlc layer entity receives the information to be sent from PDCP layers corresponding with the rlc layer
And its information is indicated accordingly.
Then, in step S22, rlc layer entity determines the transmission of the information to be sent according to the instruction information
Sequence is to be transmitted.
Specifically, rlc layer entity determines the caching sequence of the information to be sent according to the instruction information, and by institute
Stating caching sequence is used as transmission sequence to be transmitted.
Preferably, rlc layer entity determines hair corresponding with the instruction information according to the instruction information of the information to be sent
Send priority；Then, rlc layer entity determines storage row of the information to be sent in RLC caching according to the transmission priority
Sequence, successively to transmit corresponding every terms of information based on the memory sequencing.
Wherein, rlc layer entity determines at least one RLC corresponding with the information to be sent according to the transmission priority
Memory sequencing of the SDU in RLC caching, successively to transmit corresponding every terms of information based on the memory sequencing.
Wherein, the transmission priority is used to indicate the information for needing preferentially to send.
Preferably for the information having the same for sending priority, the second sub- determining device is chronologically-based next true
Fixed its caching sequence.
Preferably, include following transmission priority rule in the configuration of the rlc layer entity:
In rlc layer, common PDCP data PDU will comply with sequential delivery rule, and, first-in first-out rule.PDCP shape
State PDU will bypass sequencer procedure, and in the form of RLC SDU, be placed in front of all PDCP data PDU in buffer area,
With other PDCP status PDUs later to be used to transmit.After receiving scheduling authorization, rlc layer will notified by lower layer entities
Specific transmission chance, obtains the size of all RLC PDU indicated by low layer, and by first by these PDCP status PDUs (due to
It is on the buffer area head of RLC) it is put into RLC PDU and forms RLC PDU.
Preferably, the transmission priority of each data cell is as follows: RLC is controlled that PDU > is retransmitted or is divided comprising retransmitting
The RLC data PDU > of section includes that the RLC data PDU > of PDCP status PDU includes the RLC data PDU of PDCP data PDU.
First example according to the present invention, the message queue currently cached in the rlc layer are as shown in table 2 below, wherein institute
Stating serial number indicates 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 that this pending is delivered letters
Cease the instruction information that Msg1 is PDCP status PDU.It is that then rlc layer entity, which determines that it sends priority according to instruction information,
Two priority, and received Msg1 is encapsulated as a SDU accordingly, and priority is sent based on it and is cached, with
New message queue is obtained as shown in table 2-1:
Table 2-1
Then, rlc layer entity is based on the serial number in table 2-1, successively transmits each RLC data cell.
Second example according to the present invention, rlc layer entity receive the information Msg2 to be sent from PDCP layer entity, with
And indicate that the information Msg2 to be sent is the instruction information for needing the PDCP data PDU retransmitted.Then rlc layer entity seals the Msg2
Dress is corresponding SDU, and is placed it in buffer area after RLC controls PDU, it is all do not include retransmit data other SDU it
Before.And each RLC data cell is successively sent according to the storage order in buffer area.
According to the solution of the present invention, PDCP status data grouped element and the re-transmission of PDCP data packet units have been carried out excellent
Change, by being used to indicate the instruction information of its corresponding transmission sequence for the much information setting in PDCP layers, so that RLC
Layer can be PDCP layers of prioritised transmission PDCP data PDU and the PDCP status PDU that retransmits of needs, to be caused due to Xn interface
Loss of data, or the transmission path of user changes as the reconfiguring of radio bearer occurs, uses in doubly-linked welding system
Family carries out ensuring that PDCP layers of specific information can be transmitted to corresponding equipment as early as possible when mobile handoff and the change of prothetic group station
In.Improve the efficiency and accuracy of information transmission.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included in the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.This
Outside, it is clear that one word of " comprising " does not exclude other units or steps, and odd number is not excluded for plural number.That states in system claims is multiple
Unit or device can also be implemented through software or hardware by a unit or device.The first, the second equal words are used to table
Show title, and does not indicate any particular order.
Claims (13)
1. a kind of PDCP layer entity, wherein the PDCP layer entity is contained in the equipment of doubly-linked welding system, and described PDCP layers real
Body includes:
Sending device, it is corresponding with described PDCP layers for being sent to PDCP status PDU and corresponding instruction information
Rlc layer, wherein the instruction information is used to indicate the rlc layer entity to determine the transmission sequence of information to be sent；It is described
PDCP status PDU is placed in front of all PDCP data PDU in buffer area and other PDCP states in the form of RLC SDU
To be used to transmit after PDU；
Wherein, the PDCP layer entity further include:
Assembling device, for when meeting preset trigger condition, assembling the PDCP status PDU, and the determining and PDCP shape
The corresponding instruction information of state PDU.
2. PDCP layer entity according to claim 1, wherein the preset trigger condition include it is following at least any one:
Predetermined time condition；
Receive predetermined signaling；
Detect that the PDCP PDU as caused by Xn interface loses.
3. PDCP layer entity according to claim 2, wherein the preset trigger condition includes receiving predetermined signaling,
Wherein, the PDCP layer entity further include:
First determining device, for determining the target device that the PDCP status PDU is sent to according to the predetermined signaling；
Wherein, the assembling device is further used for:
When receiving predetermined signaling, the PDCP status PDU is assembled, and determine instruction corresponding with the PDCP status PDU
Information.
4. PDCP layer entity according to claim 1, wherein the information to be sent includes the PDCP data for needing to retransmit
PDU, wherein the PDCP layer entity further include:
First receiving device, for receiving the PDCP status PDU from peer devices feedback；
Second determining device, for PDCP status PDU based on the received determine the PDCP data PDU that needs to transmit again and
Its corresponding instruction information；
Wherein, the sending device further comprises:
The PDCP data PDU and its corresponding instruction information are sent to the rlc layer.
5. a kind of rlc layer entity, wherein the rlc layer entity is contained in the equipment of doubly-linked welding system, the rlc layer entity
Include:
Second reception device, for receiving information to be sent and its corresponding finger from PDCP layers corresponding with the rlc layer
Show information；The information to be sent includes PDCP status PDU；The PDCP status PDU is placed in slow in the form of RLC SDU
To be used to transmit before depositing all PDCP data PDU in area and after other PDCP status PDUs；
Third determining device, for determining the transmission sequence of the information to be sent to be passed according to the instruction information
It is defeated.
6. rlc layer entity according to claim 5, wherein the third determining device further comprises:
First sub- determining device determines hair corresponding with the instruction information for the instruction information according to the information to be sent
Send priority；
Second sub- determining device, for according to the transmission priority, determining storage row of the information to be sent in RLC caching
Sequence, successively to transmit corresponding every terms of information based on the memory sequencing.
7. rlc layer entity according to claim 5 or 6, wherein include following transmission in the configuration of the rlc layer entity
Priority rule: it includes PDCP status PDU that RLC, which controls PDU > the is retransmitted or RLC data PDU > comprising retransmitting segmentation,
RLC data PDU > includes the RLC data PDU of PDCP data PDU.
8. one kind method for transmitting information in PDCP layer entity, wherein the PDCP layer entity is contained in dual link system
In the equipment of system, it the described method comprises the following steps:
Step a, by PDCP status PDU and corresponding instruction information be sent to the PDCP layers of corresponding rlc layer,
In, the instruction information is used to indicate the rlc layer entity to determine the transmission sequence of information to be sent；The PDCP state
PDU is placed in front of all PDCP data PDU in buffer area and after other PDCP status PDUs in the form of RLC SDU
To be used to transmit；
Wherein, the method also includes following steps:
Step x assembles the PDCP status PDU, and the determining and PDCP status PDU pair when meeting preset trigger condition
The instruction information answered.
9. according to the method described in claim 8, wherein, the preset trigger condition includes receiving predetermined signaling, wherein institute
State step x the following steps are included:
When receiving predetermined signaling, the PDCP status PDU is assembled, and determine instruction corresponding with the PDCP status PDU
Information；
Wherein, the method also includes following steps:
According to the predetermined signaling, the target device that the PDCP status PDU is sent to is determined.
10. according to the method described in claim 8, wherein, the information to be sent includes retransmission information, wherein the method
It is further comprising the steps of:
Receive the PDCP status PDU fed back from opposite equip.；
PDCP status PDU determines the PDCP data PDU for needing to transmit again and its corresponding instruction letter based on the received
Breath；
Wherein, the step a the following steps are included:
The PDCP data PDU and its corresponding instruction information are sent to the rlc layer.
11. one kind method for transmitting information in rlc layer entity, wherein the rlc layer entity is contained in doubly-linked welding system
Equipment in, the described method comprises the following steps:
Step A, receive from PDCP layers corresponding with the rlc layer information to be sent and its corresponding indicate information；It is described
Information to be sent includes PDCP status PDU；The PDCP status PDU is placed in all in buffer area in the form of RLC SDU
To be used to transmit before PDCP data PDU and after other PDCP status PDUs；
Step B determines the transmission sequence of the information to be sent to be transmitted according to the instruction information.
12. according to the method for claim 11, wherein the step B the following steps are included:
According to the instruction information of the information to be sent, transmission priority corresponding with the instruction information is determined；
According to the transmission priority, memory sequencing of the information to be sent in RLC caching is determined, to be based on the storage
Corresponding every terms of information is successively transmitted in sequence.
13. a kind of apparatus for transmitting information, wherein the equipment includes according to any one of claims 1 to 4
PDCP layer entity and/or the rlc layer entity as described in any one of claim 5 to 7.
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