CN101621832B - Method for transmitting PDCP data unit to upper layer - Google Patents
Method for transmitting PDCP data unit to upper layer Download PDFInfo
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- CN101621832B CN101621832B CN2009101504071A CN200910150407A CN101621832B CN 101621832 B CN101621832 B CN 101621832B CN 2009101504071 A CN2009101504071 A CN 2009101504071A CN 200910150407 A CN200910150407 A CN 200910150407A CN 101621832 B CN101621832 B CN 101621832B
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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
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
- H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/321—Interlayer communication protocols or service data unit [SDU] definitions; Interfaces between layers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The present invention relates to a method for transmitting a PDCP data unit to an upper layer. The invention discloses a radio communication system for providing radio communication service and a terminal thereof, more specifically, provides a method for transmitting sostenuto and/or continuously received package data concourse protocol (PDCP) service data unit (SDU) directly under a condition that a PDCP entity receives a PDCP SDU during a RLC reconstruction process in an universal mobile telecommunication system (E-UMTS) evolved from an universal mobile telecommunication system (UMTS) or a long-term evolution system (LTE).
Description
Technical field
The present invention relates to a kind of radio (wireless) communication system and terminal that radio communication service is provided, more particularly, the method of PDCP (PDCP:Packet Data Convergence Protocol) Service Data Unit (SDU) is transmitted on the interior upper strata of receiver side entity that the present invention relates to the Universal Mobile Telecommunications System (E-UMTS:Evolved Universal Mobile Telecommunications System) to evolution, and the Universal Mobile Telecommunications System of this evolution is from Universal Mobile Telecommunications System (UMTS) or Long Term Evolution (LTE:Long Term Evolution) system evolved.
Background technology
Fig. 1 shows as an exemplary network structure that can be applied to Long Term Evolution (LTE) system of correlation technique and mobile communication system of the present invention.The LTE system is from existing UMTS system evolved and the system that comes, and the 3GPP normal structure is carried out the standardization effort of this system at present.
The LTE network can generally be divided into the UMTS Terrestrial radio access network network (E-UTRAN:Evolved UMTS Terrestrial Radio Access Network) and core network (CN) of evolution.E-UTRAN is usually by terminal (that is, subscriber equipment (UE)), base station (that is, the Node B of evolution (eNode B)), the IAD that is positioned at network one end and is connected with one or more external network.IAD can be divided into the part of process user business and the part of processing controls business.In this case, the part of the process user business of IAD can communicate by new interface with the part of IAD processing controls business.In single eNB, can there be one or more residential quarter.Interface is used in and sends customer service or service control between the eNB.CN can comprise the aGW that UE registered for the user and node etc.Can use the interface that E-UTRAN and CN are distinguished.
Fig. 2 and Fig. 3 show based on the terminal of 3GPP Radio Access Network standard and the respective examples structure of the Radio interface protocols between the E-UTRAN.Radio interface protocols has level course, this level course comprises physical layer, data link layer and network layer, Radio interface protocols also has vertical plane, and this vertical plane has comprised the user's face (U-plane) that is used for the transmission user data information and the chain of command (C-plane) that sends control signaling.Three lower levels based on known open system interconnection (OSI) master pattern in communication system can be categorized as the protocol layer among Fig. 2 and Fig. 3 ground floor (L1), the second layer (L2) and the 3rd layer (L3).Radio protocol layer is present between UE and the E-UTRAN with paired form, and the data of processing in the wave point send.
The below will describe each layer of the wireless protocols chain of command among Fig. 2 and each layer of the radio protocol user plane among Fig. 3.
Physical layer (being ground floor) is by using physical channel to provide information transfer service to the upper strata.Physical layer is connected to the upper strata that is called as medium access control (MAC) layer via transmission channel.Between MAC layer and physical layer via the transport channel data.The shared channel according to whether is divided into dedicated transmission channel and Common transport channel with transmission channel.Between different physical layers, namely between the physical layer of the physical layer of transmitter side and receiver side, send data via the physical channel with Radio Resource.
The second layer comprises various layers.At first, medium access control (MAC) layer is mapped to various transmission channels with various logical channels, and by several logic channels are mapped to single transmission channel and carry out multiplexing to logic channel.The MAC layer is connected to the upper strata that is called as Radio Link control (RLC) layer by logic channel.According to the type of the information of transmission, logic channel roughly is divided into the control channel that sends chain of command information and the Traffic Channel that sends user plane information.
The Radio Link of second layer control (RLC) layer is cut apart and/or is connected the data that receive from the upper strata and adjusts size of data and send data to be suitable for lower one deck to wave point.In addition, in order to guarantee the desired various service quality of each radio bearer (RB) (QoS), rlc layer provides three kinds of operator schemes: transparent mode (TM); Unacknowledged Mode (UM:UnacknowledgedMode); And affirmation mode (AM:Acknowledged Mode).Specifically, AM RLC carries out functions of retransmission to realize reliable data transmission by HARQ (ARQ:Automatic Repeat and Request).
In order in having the wave point of narrow bandwidth, effectively to send the IP grouping such as IPv4 or IPv6, the PDCP of the second layer (PDCP) layer is carried out a kind of function that is called as header-compressed, this function reduced relatively large and comprised unnecessary control information ' the size of the header of grouping.Header-compressed only sends necessary information by the header portion that allows data, has improved the transmitting efficiency between the wave point.In addition, the PDCP layer is carried out safety function in the LTE system.This safety function comprises be used to preventing the encryption that the third party eavesdrops data and being used for preventing the integrity protection that the third party operates data.
Radio Resource control (RRC) layer that is arranged in the 3rd layer bottommost only is limited at chain of command, its to the configuration of radio bearer (RB), reconfigure and release aspect logic channel, transmission channel and physical channel are controlled.In this case, RB refers to the ground floor of the wireless protocols that sent by the data between UE and UTRAN and the logical path that the second layer provides.Usually, the configuration (set up, arrange) of RB is referred to radio protocol layer and the characteristic that the required channel of specific data service is provided are stipulated and arranged the process of corresponding detail parameters and method of operation.RB comprises two types: signaling RB (SRB:Signaling Radio Bearers) and data RB (DRB:Data Radio Bearers).SRB is used as and sends the RRC message pathway on the chain of command, and DRB is used as the path that sends user data on user's face.
In correlation technique, for rebuilding the PDCPSDU receive by RLC (Radio Link control), the PDCP entity of receiver side is not carried out the rearrangement processing after received PDCP SDU is transmitted on the upper strata PDCP SDU being stored in the buffer.Only after the comparative result of the sequence number (SN) that obtains being stored in the PDCP SDU in the buffer and the sequence number of the new PDCP SDU that after RLC rebuilds, receives, just transmit the PDCP SDU that is stored in the buffer to the upper strata.
In correlation technique, the PDCP SDU that is carried out by the PDCP entity at transmitter side retransmits based on RLC status report rather than RLC reconstruction.Like this, in the ordinary course of things, PDCP can rebuild number of times and receive the PDCP SDU that all are lost by the RLC that exceeds.For example, if occured repeatedly to switch within the limited time period, the possibility that then receives all PDCP SDU that lose is very high, and this is to have caused repeatedly RLC to rebuild owing to repeatedly switching.Yet the repeating transmission of in RLC process of reconstruction repeatedly the PDCP SDU that loses being carried out repetition can cause unnecessary time delay or to the waste of Radio Resource.
In addition, explain as top, those are rebuild the PDCP SDU that receives by RLC and are not directly sent to the upper strata.But after those PDCP SDU are stored in buffer, they have been carried out rearrangement processed.This also can cause unnecessary time delay.In addition, be the last grouping of data flow if rebuild the PDCP SDU that receives by RLC, the situation of deadlock then can occur.For example, if PCDP SDU is the last grouping of data flow, owing to no longer including the data that will rebuild to receive by RLC, so this PDCP SDU is kept in the buffer right, and can not be sent to the upper strata.
Therefore, need a kind of solution to the defects in the correlation technique.
Summary of the invention
Therefore, the objective of the invention is the time delay that minimise data sends, thereby prevent the waste of radio resources in the data transmission procedure, and/or prevent from the process that transmits PDCP SDU to the upper strata, occurring the situation of deadlock.
For this reason, the present invention proposes, and has received PDCP SDU if the PDCP entity is rebuild by RLC from the RLC entity, then directly transmits constantly and/or successively received PDCPSDU to the upper strata.
In order to realize this point and other advantage, according to purpose of the present invention, as here implement particularly and broadly explanatorily, a kind of data communications method in wireless communication system is provided, the method may further comprise the steps: receiving step has the data cell of sequence number from lower one deck reception; Storing step is stored in received data cell in the buffer; Whether determination step, the described sequence number of judging received data cell equal from the sequence number of the sequence number of the data cell of last transmission+1; And transfer step, all that transmit the relevant sequence number that continues with the sequence number that is greater than or equal to received data cell based on described determination step with the ascending order of relevant sequence number are storage data units.
Description of drawings
Fig. 1 shows as an exemplary network structure that can be applied to the universal terrestrial access network (E-UTRAN) of the evolution of correlation technique and mobile communication system of the present invention;
Fig. 2 is an exemplary diagram of the chain of command framework of the correlation technique Radio interface protocols between terminal and E-UTRAN;
Fig. 3 is an exemplary diagram of user's face framework of correlation technique Radio interface protocols between terminal and E-UTRAN;
Fig. 4 is the exemplary configurations of using PDCP entity of the present invention;
Fig. 5 is the exemplary dataflow that expression transmits the PDCP data cell;
Fig. 6 is the exemplary dataflow that expression is resequenced and transmitted the PDCP data cell;
Fig. 7 is another exemplary dataflow that expression is resequenced and transmitted the PDCP data cell;
Fig. 8 is the first exemplary dataflow that expression transmits the PDCP data cell according to the present invention; And
Fig. 9 is the second exemplary dataflow that expression transmits the PDCP data cell according to the present invention.
Embodiment
One aspect of the present invention has related to the understanding of inventor to the problem in the aforesaid correlation technique, and will further explain this hereinafter.Based on this understanding, developed each feature of the present invention.
Be in mobile communication system (for example, the UMTS that under the 3GPP standard, develops), to realize although show the present invention, can also apply the present invention to follow different standards and norms and other communication system of moving.
Hereinafter, provide with reference to the accompanying drawings according to the structure of preferred implementation of the present invention and the description of operation.
As mentioned above, the present invention efforts be made so that the time delay that data send minimizes, thereby prevents in data transmission procedure the waste to Radio Resource, and/or prevents from occurring in the process that transmits PDCPSDU to the upper strata situation of deadlock.
For this purpose, received PDCP SDU by the RLC reconstruction from the RLC entity if the present invention proposes the PDCP entity, then directly send continuous and/or the PDCP SDU that receives that continues to upper strata.
The below will provide the detailed description to the PDCP entity.Usually, the PDCP entity is upwards used with rrc layer or user and is connected, and is connected with rlc layer downwards.Fig. 4 is the exemplary configurations of using PDCP entity of the present invention.As shown in Figure 4, the PDCP entity is divided into PDCP transmitter side and PDCP receiver side.At equity (peer) PDCP entity transmission Service Data Unit (SDU:service data units) and the protocol Data Unit (PDU:protocol data unit) of the PDCP of transmitter side entity to receiver side.The PDCP entity of receiver side extracts PDCPSDU or control information from the PDCP PDU that sends.Usually, data PDU (PDCP data PDU) and control PDU (PDCP controls PDU) are by the PDCP solid generation of transmitter side.Data PDU is to process and the data block that generates among PDCP by the SDU that the upper strata from the PDCP entity is received, and control PDU is the data block that is used for providing to peer-entities control information that generates in PDCP.All generate the PDCP data PDU at user's face of radio bearer (RB) and chain of command in the two.Some functions of PDCP are selectively used for user's face and chain of command.For example, only in user's face to the market demand header compression function, and the integrity protection function in chain of command inbound data application safety function only.Safety function also comprises data encryption feature, and can use this encryption function at user's face and chain of command inbound data.PDCP can be controlled PDU and be used for the state (that is, PDCP status report) of expression PDCP reception buffer and/or the state (that is, header compression feedback packet) of expression header-compressed.
The below will be given in the data handling procedure that the PDCP transmitter side is carried out.At first, PDCP layer (or entity) is stored in the PDCP SDU that receives in the transmission buffer, and be each PDCP SDU distributing serial numbers (SN) (S1).If the radio bearer of setting up is Data Radio Bearer (DRB) (that is, the radio bearer of user's face), then the PDCP layer is carried out header-compressed (S2) for PDCP SDU.If the radio bearer of setting up is Signaling Radio Bearer (SRB) (that is, the radio bearer of chain of command), then the PDCP layer is for PDCP SDU complete protection operation (S3).After this, the PDCP layer is encrypted (S4) for the data block that the result who utilizes S2 or S3 generates.PDCP has generated PDCP PDU by header being added to the data block that generates from S4, and afterwards, PDCP transmits the PDCP PDU that generates to rlc layer.
The below will be given in the data handling procedure that the PDCP receiver side is carried out.At first, PDCP layer (or entity) removes header (S1) from received PDCP PDU.Afterwards, the PDCP layer is carried out deciphering (S2) for the PDCP PDU that does not have header.If the radio bearer of setting up is Data Radio Bearer (DRB) (that is, the radio bearer of user's face), then the PDCP layer is carried out decompress (S3) for the PDCP PDU after deciphering.If the radio bearer of setting up is Signaling Radio Bearer (SRB) (that is, the radio bearer of chain of command), then the PDCP layer is for the PDCP PDU complete protection operation (S4) after deciphering.After step 3 or step 4, the data block (that is, PDCP SDU) after the PDCP layer is processed to the upper strata transmission (S5).If the radio bearer of setting up is the Data Radio Bearer (DRB) that uses in the affirmation pattern (RLC AM) of Radio Link control, then can be with the data block store after processing in reception buffer, and the data (S6) after then after carrying out the rearrangement operation, transmitting this processing to the upper strata.Here, if the radio bearer of setting up is the Data Radio Bearer (DRB) that uses in the affirmation pattern (RLC AM) of Radio Link control, then essential execution rearrangement operation, this is because the DRB that uses among the RLC AM often sends wrong sensitive data professional (error sensitive data traffic).For this reason, data are retransmitted that the data transmission errors in the wireless communication procedure is minimized.Need the rearrangement operation to transmit PDCP SDU to the upper strata according to sequence order.In RLC AM, can use a lot of different ' state variables ' to come to transmit PDCP SDU to the upper strata according to sequence order.
At first, state variable can be defined as follows:
-RSN (sequence number that receives): the sequence number of the PDCP SDU that receives
-LAST (the PDCP SDU SN that submits at last): in all PDCPSDU that transmit to the upper strata, the sequence number of the PDCP SDU that transmits at last
-NEXT (the PDCP SDU SN of next expectation): the sequence number (that is, maximum PDCP SDU SN+1) of next PDCP SDU that in the PDCP SDU that all receive, has the PDCP SDU of maximum sequence number
Use above state variable, when the PDCP of receiver side entity received PDCP SDU, this PDCP entity can come the PDCP SDU that receives is processed according to following process.Here, only for illustrative purposes, suppose all values all are limited in 0 to 4095 the scope, and minimum value is NEXT-2048.
At first, if the PDCP entity receive its sequence number less than or be less than before send the PDCP SDU of sequence number of the PDCP SDU on upper strata to, then owing to the PDCP SDU that receives is that out-of-date PDCP SDU has abandoned this PDCP SDU.Can express this process by following program language (proceduretext).
-if?NEXT-2048＜＝RSN＜＝LAST
-deciphering
-decompress
-abandon
Receive PDCP SDU at the PDCP entity, and the sequence number of this PDCP SDU is in the sequence number of the DPCP SDU that sends at last the upper strata to and have in the situation between the sequence number of PDCP SDU of maximum S/N, if the PDCP SDU that this PDCP SDU is repetition then abandons this PDCP SDU.If the PDCP SDU that this PDCP SDU is not repetition then is stored in received PDCP SDU in the reception buffer.Can express this process by following program language.
-if?LAST＜RSN＜NEXT
-deciphering
-decompress
-if not what repeat, then be stored in the reception buffer
-if repeat, then abandon
If the PDCP entity receives PDCP SDU, and the sequence number of this PDCP SDU is more than or equal to the sequence number of the PDCP SDU with maximum S/N, then because this PDCPSDU that receives is new PDCP SDU and it is stored in the reception buffer.NEXT be updated to RSN+1 thereafter.
Can express this process with following program language.
-ifNEXT＜＝RSN＜NEXT+2048
-deciphering
-decompress
-be stored in the reception buffer
-NEXT is set as RSN+1
After using above process that the PDCP SDU that receives is processed and stores, PDCP entity (or layer) can use following process to transmit the PDCP SDU that has stored to the upper strata.
Can express this process by following program language.
The PDCP SDU that-ifPDCP receives is not because RLC rebuilds:
-transmit to the upper strata according to the ascending order of relevant SN value:
-have all the PDCP SDU that stored less than the SN of RSN;
-have all the PDCP SDU that stored more than or equal to the relevant SN value of continuing of RSN;
-LAST is set as the SN of last the PDCP SDU that sends the upper strata to
That is not that ability directly sends PDCPSDU to upper strata when rebuilding owing to RLC in the reception to PDCP SDU only.Yet, must carry out the rearrangement operation to rebuild the PDCP SDU that receives because of RLC.
Fig. 5 is the exemplary dataflow that expression transmits the PDCP data cell.As shown in Figure 5, at first, receive the PDCP PDU that comprises serialized PDCP SDU.Here, sequence number can be defined as " RSN ".Then, carry out the operation of deciphering and header decompression, the PDCP SDU after then will deciphering and decompress is stored in the PDCP buffer.Then, the PDCP entity checks whether RSN is greater than or equal to NEXT.If RSN is greater than or equal to NEXT, then NEXT is set as RSN+1.Then, the PDCP entity is judged what whether received PDCP SDU received owing to the reconstruction of RLC.Receive owing to RLC rebuilds if judge received PDCP SDU, then stop the transport process of PDCP SDU.If received PDCP SDU receives owing to RLC rebuilds, then the PDCP entity have less than the SN of RSN to the upper strata transmission with the ascending order of relevant SN value all stored PDCP SDU.In addition, the PDCP entity also have more than or equal to the relevant SN value of continuing of RSN to the upper strata transmission with the ascending order of relevant SN value all stored PDCP SDU.Thereafter, PDCP is set as LAST the SN of last the PDCP SDU that sends the upper strata to, and stops PDCP SDU transport process.
Fig. 6 is the exemplary dataflow that expression is resequenced and transmitted the PDCP data cell.For simple explanation is provided, in Fig. 6, do not consider PDCP control PDU, and suppose to comprise single PDCP PDU among the single RLC PDU, and this PDCP PDU comprises single PDCP SDU.
At first, the RLC entity of receiver side continuously (by sequence order) receives RLC PDU until RLC PDU=13, then they is sent to the PDCP entity of receiver side.When RLC PDCP is transmitted to the PDCP entity, receives the RLC entity and just successfully receive by the RLC status report until the RLC entity of the RLC PDU notice transmitter side of RLC PDU=13.Owing to receiving PDCP SDU by the sequence order, therefore receiving the PDCP entity can transmit until the PDCP SDU of PDCPSDU=22 to the upper strata.Here, can come just successfully to receive until the PDCP SDU of PDCP SDU=22 notifies or confirms to transmission PDCP entity by the RLC status report.
As shown in Figure 6, before RCL rebuilds, send the RLC entity and send RLC PDU=14 to RLC PDU=20, but RLC is PDU=16,17,19 send unsuccessfully.Like this, receive the RLC entity to upper strata PDCP entity transmit by sequence receive until the RLC SN of RLC SN=15, and the PDCP entity transmit to its upper strata equally by sequence receive until the PDCP SDU of PDCP SN=24.At this moment, LAST equals 24, and NEXT equals 25.Successfully receive RLCPDU=18 and RLC PDU=20, but because of some RLC PDU that successfully do not receive among the previous RLC PDU, and these RLC PDU are stored in the reception buffer.At this moment, receive the RLC entity and need to notify this situation to sending the RLC entity by the RLC status report, but before sending the RLC status report, RLC reconstruction (S1) has occured.
If owing to switching the RLC reconstruction occurs, then transmits those RLC PDU that successfully received that are stored in buffer because successfully not receiving some the RLC PDU among the previous RLC PDU to the upper strata of PDCP entity.In the situation of Fig. 6, RLC PDU=18 and RLCPDU=20 belong to this situation, therefore, correspondingly transmit RLC PDU=18 and RLCPDU=20 to the upper strata.The PDCP entity will be stored in the PDCP reception buffer owing to RLC rebuilds the PDCP SDU that receives.Like this, PDCP SDU=27 and PDCP SDU=29 are stored in the PDCP reception buffer.Judge that based on nearest RLC status report successful PDCP SDU sends the result owing to sending the PDCP entity, therefore send the PDCP entity and infers and successfully sent until the PDCP SDU of PDCP SDU=22, and the PDCP SDU between PDCP SDU=23 and the PDCP SDU=29 is by successfully transmission (S2).
After RLC rebuilds, the initialization of RLC entity or whole state variables that reset, and restart the data transmission.Send the PDCP entity and can resend these PDCP SDU that before RLC rebuilds, successfully do not send to reception PDCP entity.Here, some PDCP SDU may lose, and transmission PDCP entity can only resend the PDCPSDU that can send by the sequence order.Send the PDCP entity and resend not successful these PDCP SDU that send before RLC rebuilds based on nearest RLC status report.In the situation of Fig. 6, send the PDCP entity and resend PDCP SDU (PDCP SDU=23 is to PDCP SDU=29).Send these PDCP SDU by RLCPDU=0 to RLC PDU=6.When reception RLC entity receives these RLC PDU (0-6), send these RLC PDU to reception PDCP entity by the sequence order.If the received PDCP entity of these RLC PDU receives, because the SN of PDCP SDU=23 and 24 is dropped less than LAST, and because stored PDCP SDU=27 and 29, so also abandon this two PDCP SDU.Receive the PDCP entity and transmit PDCP SDU=25 to the upper strata to PDCP SDU=29 by the sequence order.After having transmitted the PDCP SDU that can send, the state variable of LAST and NEXT is updated to LAST=29 and NEXT=30 (S3-1).
In handoff procedure, the PDCP SDU that source eNB can successfully send these is transmitted to target eNB.Yet there is the possibility of loss of data in the interface between network.In the situation of Fig. 6, transmit PDCP SDU (PDCP SDU=23 is to PDCPSDU=29) from source eNB to target eNB, but in the RLC process of reconstruction, the DCP SDU from PDCP SDU=23 to PDCP SDU=27 loses.Send the PDPC entity and send these PDCP SDU by PDCP SDU (from PDCP SDU=28 to PDCP SDU=31) is included in the RLC PDU (RLC PDU=0 is to RLC PDU=3) with ascending order.If the received PDCP entity of these RLC PDU receives, then these RLC PDU are sent to by the sequence order and receive the PDCP entity.If the received PDCP entity of these RLC PDU receives, because the SN of PDCP SDU=23 and 24 is dropped less than LAST, and because stored PDCP SDU=27 and 29, so also abandon this two PDCP SDU.Receive the PDCP entity and transmit PDCPSDU=25 to the upper strata to PDCP SDU=29 by the sequence order.Receive the PDCP SDU=28 that comprises among the RLC PDU=0 if receive the PDCP entity, then transmit the PDCP SDU=27 with less SN to the upper strata.And, also send PDCP SDU=28 and the PDCP SDU=29 that continues thereof to upper strata.After having transmitted the PDCP SDU that can send, the state variable of LAST and NEXT is updated to LAST=29 and NEXT=30 (S3-2).
Fig. 7 is another exemplary dataflow that expression is resequenced and transmitted the PDCP data cell.
At first, the RLC entity of receiver side continuously (by sequence order) receives until the RLC PDU of RLCPDU=13, then they is sent to the PDCP entity of receiver side.When RLCPDCP is delivered to the PDCP entity, receives the RLC entity and just successfully receive by the RLC status report until the RLC entity of the RLC PDU notice transmitter side of RLC PDU=13.Owing to receiving PDCP SDU by the sequence order, therefore receiving the PDCP entity can transmit until the PDCP SDU of PDCPSDU=22 to the upper strata.Here, can come just successfully to receive until the PDCP SDU of PDCP SDU=22 notifies or confirms to transmission PDCP entity by the RLC status report.
As shown in Figure 7, before RLC rebuilds, send the RLC entity and send RLC PDU=14 to RLC PDU=20, but RLC is PDU=16,17,19 send unsuccessfully.Like this, receive the RLC entity to upper strata PDCP entity transmit by sequence receive until the RLC SN of RLC SN=15, and the PDCP entity transmit to its upper strata equally by sequence receive until the PDCP SDU of PDCP SN=24.At this moment, LAST equals 24, and NEXT equals 25.Successfully receive RLCPDU=18 and RLC PDU=20, but because of some RLC PDU that successfully do not receive among the previous RLC PDU, and these RLC PDU are stored in the reception buffer.At this moment, receive the RLC entity and need to notify this situation to sending the RLC entity by the RLC status report, but before sending the RLC status report, RLC reconstruction (S1) has occured.
If owing to switching the RLC reconstruction occurs, then transmits those RLC PDU that successfully received that are stored in buffer because successfully not receiving some the RLC PDU among the previous RLC PDU to the upper strata of PDCP entity.In the situation of Fig. 7, RLC PDU=18 and RLCPDU=20 belong to this situation, therefore, correspondingly transmit RLC PDU=18 and RLCPDU=20 to the upper strata.The PDCP entity will be stored in the PDCP reception buffer owing to RLC rebuilds the PDCP SDU that receives.Like this, PDCP SDU=27 and PDCP SDU=29 are stored in the PDCP reception buffer.Judge that based on nearest RLC status report successful PDCP SDU sends the result owing to sending the PDCP entity, therefore send the PDCP entity and infer until the PDCP SDU of PDCPSDU=22 is successfully sent, and the PDCP SDU between PDCP SDU=23 and the PDCP SDU=29 is not successfully sent (S2).
After a RLC rebuilds and before the 2nd RLC rebuilds, owing to causing RLC PDU (RLC PDU=2 to 6 and 8), the RLC PDU that loses is stored in (S3) in the RLC buffer.
When the 2nd RLC rebuilds, receive the PDCP entity and can receive the PDCPSDU (PDCP SDU 25 to 29) that all loses.Yet, as shown in Figure 7, even receive these PDCP SDU by the sequence order, they can not sent to upper strata (S4) yet.
As mentioned above, an object of the present invention is the time delay of minimise data transmission, prevent the waste of the Radio Resource during the transfer of data, and/or prevent the deadlock situation during transmitting PDCP SDU to the upper strata.
For this reason, the present invention propose the PDCP entity by RLC rebuild when the RLC entity receives PDCP SDU, use following procedural text (procedure text) come directly to transmit to the upper strata continuously and/the PDCP SDU that receives consistently.
-ifRSN＝LAST+1：
-transmit to the upper strata with the ascending order of relevant SN value:
-have all PDCPSDU that stored more than or equal to the relevant SN value of continuing of RSN;
-LAST is set as to the SN of the last PDCP SDU of upper strata transmission;
-in addition, if the PDCP SDU that is received by PDCP is not because RLC rebuilds:
-transmit to the upper strata with the ascending order of relevant SN value:
-have all the PDCP SDU that stored less than the relevant SN value of RSN;
-have all the PDCP SDU that stored more than or equal to the relevant SN value of continuing of RSN;
-LAST is set as to the SN of the last PDCP SDU of upper strata transmission.
According to above procedural text, when receiving PDCP SDU by the RLC reconstruction, the present invention proposes to judge whether the sequence number (SN) of received PDCP SDU equals LAST+1.When judging, if the sequence number of received PDCP SDU is LAST+1, then should directly transmit received PDCP SDU and any PDCP SDU with the continuous sequence number that continues after the sequence number of the PDCP SDU that this receives to the upper strata by the sequence order, rather than these PDCP SDU are stored in the reception buffer.
Fig. 8 is that expression is according to the first case expressivity data flow of transmission PDCP data cell of the present invention.
As shown in Figure 8, at first, receive the PDCPPDU that comprises serialized PDCP SDU.Here, sequence number can be defined as " RSN ".Then, carry out the operation of deciphering and header decompression, the PDCP SDU after then will deciphering and decompress is stored in the PDCP buffer.Then, the PDCP entity checks whether RSN is greater than or equal to NEXT.If RSN is greater than or equal to NEXT, then NEXT is set as RSN+1.Whether the sequence number of then, judging received PDCPSDU (that is, RSN) equals LAST+1.When judging, if SN equals LAST+1, then transmit received PDCP SDU to the upper strata and have any PDCP SDU (that is, have more than or equal to the relevant SN value of continuing of RSN all PDCP SDU) of the continuous sequence number that continues after the sequence number of the PDCP SDU that this receives.Then, the PDCP entity is set as LAST the SN of the last PDCP SDU that sends the upper strata to, and stops PDCP SDU transport process.On the other hand, when judging, if RSN is not equal to LAST+1, then the PDCP entity determines whether that the reconstruction owing to RLC receives received PDCP SDU.If judge it is to receive received PDCP SDU owing to RLC rebuilds, then stop the transport process of PDCPSDU.Receive received PDCP SDU if not rebuilding owing to RLC, then the PDCP entity have less than the relevant SN of RSN to the upper strata transmission with the ascending order of relevant SN value all stored PDCP SDU.In addition, the PDCP entity also have more than or equal to the relevant SN value of continuing of RSN to the upper strata transmission with the ascending order of relevant SN value all stored PDCPSDU.Then, PDCP is set as LAST the SN of the last PDCP SDU that sends the upper strata to, and stops PDCP SDU transport process.
Whether the sequence number of judging received PDCP SDU here, equals the step of LAST+1 and determines whether that the step that reconstruction owing to RLC receives received PDCP SDU is the step of mutual exclusion.Thus, carry out this two determination steps by exchange sequence.Therefore, following procedural text according to the present invention also is available.
-if is not the PDCP SDU that is received by PDCP because RLC rebuilds:
-send to the upper strata with the ascending order of relevant SN value:
-have all the PDCP SDU that stored less than the relevant SN of RSN;
-have more than or equal to the relevant SN value of continuing of RSN all stored PDCPSDU;
-LAST is set as to the SN of the last PDCP SDU of upper strata transmission.
-in addition, if RSN=LAST+1:
-transmit to the upper strata with the ascending order of relevant SN value:
-have more than or equal to the relevant SN value of continuing of RSN all the storage PDCPSDU;
-LAST is set as to the SN of the last PDCP SDU of upper strata transmission;
Fig. 9 is that expression is according to the second case expressivity data flow of transmission PDCP data cell of the present invention.
As shown in Figure 9, receive the PDCP PDU that comprises serialized PDCP SDU.Here, sequence number can be defined as " RSN ".Then, carry out the operation of deciphering and header decompression, the PDCP SDU after then will deciphering and decompress is stored in the PDCP buffer.Then, the PDCP entity checks whether RSN is greater than or equal to NEXT.If RSN is greater than or equal to NEXT, then NEXT is set as RSN+1.Then, determine whether that the reconstruction owing to RLC receives the PDCP SDU that receives.If judge it is to receive the PDCPSUD that receives because RLC rebuilds, then whether the sequence number of the received PDCP SDU of PDCP entity judgement (that is, RSN) equals LAST+1.When judging, if RSN equals LAST+1, then transmit received PDCP SDU to the upper strata and have any PDCP SDU (that is, have more than or equal to the relevant SN value of continuing of RSN all PDCP SDU) of the continuous sequence number that continues after the sequence number of the PDCP SDU that this receives.Then, the PDCP entity is set as LAST the SN of the last PDCP SDU that sends the upper strata to, and stops PDCP SDU transport process.On the other hand, if RSN is not equal to LAST+1, then stop immediately the transport process of PDCP SDU.If judge to receive the PDCP SDU that receives not due to RLC rebuilds, then the PDCP entity transmits all that have less than the SN value of being correlated with of RSN with the ascending order of relevant SN value and has stored PDCP SDU to the upper strata.In addition, the PDCP entity also have more than or equal to the relevant SN value of continuing of RSN to the upper strata transmission with the ascending order of relevant SN value all stored PDCP SDU.Then, PDCP is set as LAST the SN of the last PDCP SDU that sends the upper strata to, and stops PDCP SDU transport process.
The COUNT form that comprises the PDCP SN (sequence number) that mentions among the present invention also can be applied to the present invention.Here, the COUNT value by HFN (Hyper Frame Number: HyperFrame Number) and PDCP SN consist of.The length of PDCP SN can be set by the upper strata.The COUNT value can replace PDCP SN to use, and has mentioned in the present invention (wrap around) problem of unrolling that any operating period causes in order to solve.
The present invention can provide the data communications method in a kind of wireless communication system, and the method may further comprise the steps: have the data cell of sequence number from lower floor's reception; The data cell that receives is stored in the buffer; Whether the sequence number of judging received data cell equals from the sequence number of the sequence number of the data cell of last transmission+1; All that transmit the relevant sequence number that continues with the sequence number that is greater than or equal to received data cell based on described determination step with ascending order are storage data units, and the sequence number that will send the final data unit on upper strata to is set as " LAST ", wherein, described lower floor is Radio Link control (RLC) layer, in packet data convergence protocol (PDCP) entity, carry out described judgement and transfer step, described data cell is PDCP Service Data Unit (SDU), rebuild to receive described data cell by RLC, between described receiving step and described storing step, carry out header decompression and deciphering, described sequence number+1 expression is the sequence number sequence number afterwards of the last data cell that transmits and then, and described sequence number+1 expression is from the next sequence number of the sequence number of the data cell of last transmission.
Although invention has been described take mobile communication as background, the present invention can also be used for utilizing any wireless communication system of mobile device (for example, being equipped with PDA and the notebook computer of wireless communication ability (that is, interface)).In addition, describing the present invention with particular term is not the wireless communication system that scope of the present invention will be limited to particular type.The present invention also can be applicable to utilize other wireless communication systems (for example, TDMA, CDMA, FDMA, WCDMA, OFDM, EV-DO, Wi-Max, Wi-Bro etc.) of different air interfaces and/or physical layer.
These illustrative embodiments can be implemented as utilizes standardization program and/or engineering to produce the method for software, firmware, hardware or its any combination, device or goods.Term used herein " goods " refers to that hardware logic (for example, integrated circuit (IC) chip, field programmable gate array (FPGA), application-specific integrated circuit (ASIC) (ASIC) etc.) or computer-readable medium is (for example, magnetic storage medium (for example, hard disk drive, floppy disk, tape etc.), optical memory (CD-ROM, CD etc.), volatibility or non-volatile memory devices (for example, EEPROM, ROM, PROM, RAM, DRAM, SRAM, firmware, FPGA (Field Programmable Gate Array) etc.)) in the code or the logic that realize.
Code in the computer-readable medium can visit and carry out by processor.The code of realization example execution mode can also visit from file server by transmission medium or via network.In this case, the goods of code realization can comprise transmission medium (for example, Network transmission line, wireless transmission medium, the signal that passes through space, radio propagation, infrared signal etc.).Certainly, those skilled in the art will recognize that in the situation that do not depart from scope of the present invention and can make many modifications to this structure, and goods can comprise any information bearing medium as known in the art.
Since the present invention can in the situation that do not depart from its spirit and inner characteristic implement in a variety of forms, so it is to be further understood that, above-mentioned execution mode is not subjected to the restriction of any details described above, unless otherwise, otherwise should in the spirit and scope that claims limit, do broadly to explain, therefore, falling into institute in the equivalents of the boundary of claim and scope or such boundary and scope changes and revises all and should be included in claims.
Claims (13)
1. data communications method in wireless communication system, the method may further comprise the steps:
Receiving step has the data cell of sequence number from lower one deck reception;
Storing step is stored in received data cell in the buffer;
Determination step, if receive received data cell owing to Radio Link control RLC rebuilds, whether the described sequence number of then judging received data cell equals from the sequence number of the sequence number of the data cell of last transmission+1; And
Transfer step, all that transmit the relevant sequence number that continues with the sequence number that is greater than or equal to received data cell based on described determination step with ascending order are storage data units.
2. method according to claim 1, wherein, described lower one deck is Radio Link control (RLC) layer.
3. method according to claim 1, wherein, described determination step and transfer step are carried out in PDCP (PDCP) entity.
4. method according to claim 1, wherein, described data cell is PDCP Service Data Unit (SDU).
5. method according to claim 1 wherein, is carried out header decompression or deciphering between described receiving step and described storing step.
6. method according to claim 1, wherein, described sequence number+1 expression is the sequence number after the sequence number of the data cell of described last transmission and then.
7. method according to claim 1, wherein, described sequence number+1 expression is from the next sequence number of the sequence number of the data cell of described last transmission.
8. method according to claim 1, the method is further comprising the steps of:
The sequence number that sends the final data unit on upper strata to is set as " LAST ".
9. data communication equipment in wireless communication system, described data communication equipment comprises:
Radio protocol layer, described radio protocol layer is suitable for carrying out following steps: have the data cell of sequence number from lower one deck reception; Received data cell is stored in the buffer; If receive received data cell owing to Radio Link control RLC rebuilds, whether the described sequence number of then judging received data cell equals from the sequence number of the sequence number of the data cell of last transmission+1, and all storage data units that transmit the relevant sequence number that continues with the sequence number that is greater than or equal to received data cell with ascending order.
10. data communication equipment according to claim 9, wherein, described lower one deck is Radio Link control rlc layer, and described data cell is PDCP PDCP Service Data Unit SDU.
11. data communication equipment according to claim 9, wherein, described sequence number+1 expression is the sequence number sequence number afterwards of the data cell of described last transmission and then.
12. data communication equipment according to claim 9, wherein, described sequence number+1 expression is from the next sequence number of the sequence number of the data cell of described last transmission.
13. data communication equipment according to claim 9, wherein, described radio protocol layer also is suitable for carrying out following steps: the sequence number that will send the final data unit on upper strata to is set as " LAST ".
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| KR1020090050624A KR100954925B1 (en) | 2008-06-20 | 2009-06-08 | Method of delivering a pdcp data unit to an upper layer |
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| CN108551681B (en) | 2012-11-29 | 2022-01-14 | 华为技术有限公司 | Data transmission control method, device and system |
| CN111835767B (en) * | 2014-10-30 | 2022-08-02 | 三星电子株式会社 | Method of performing device-to-device communication between user equipments |
| CN106304127B (en) * | 2015-05-13 | 2019-11-01 | 苏州简约纳电子有限公司 | A kind of LTE data surface downlink error-detection error-correction method |
| CN107370692B (en) * | 2016-05-11 | 2020-03-17 | 中国移动通信有限公司研究院 | Data transmission method, radio link control entity and system |
| CN108924964B (en) * | 2017-04-07 | 2023-05-23 | 中兴通讯股份有限公司 | Method and user equipment for ensuring communication continuity |
| KR102554052B1 (en) * | 2017-08-16 | 2023-07-17 | 삼성전자 주식회사 | The method of efficient packet duplication transmit and receive operation in the next generation wireless communication systems |
| WO2019054830A1 (en) | 2017-09-18 | 2019-03-21 | Samsung Electronics Co., Ltd. | Method and apparatus for processing a packet in a wireless communication system |
| KR102602207B1 (en) * | 2017-09-18 | 2023-11-15 | 삼성전자주식회사 | Method and apparatus of reestablishing pdcp entity for header compression protocol in wireless communication system |
| CN114270742B (en) * | 2020-04-30 | 2024-03-26 | 华为技术有限公司 | Method for processing data packet and communication device |
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