CN101043301B - Data rearrangement and recombination method in wireless communication system and its base station - Google Patents
Data rearrangement and recombination method in wireless communication system and its base station Download PDFInfo
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Abstract
A data realigning and regrouping method in radio communication system is disclosed, the receiving end realigns/regroups the data pack according to the SN, at the same time it sets the receiving buffering conditions, and processes the realigned data according to the receiving buffering conditions. Thereinto, the realigning/regrouping is done like this: checks the data pack received by the auto retransmitting HARQ course, and the data pack with correct checking is transmitted to the repetitive units, and the repetitive units multi complexes the HARQ PDU according to the pack head information of protocol data unit PDU of HARQ, and transmits it to the top to realize the realigning of Outer ARQ unit. The invention also discloses base station which works as the receiving end according to the said method. Because the retransmitting of HARQ and ARQ is realized in one physical entity, using the window and timer to control the partitions of receiving buffer of HARQ and ARQ, can triggers the ARQ retransmitting quickly and reduce the processing delay caused by the realigning, and also can reduce the effect caused by the unite of two retransmitting.
Description
Technical field
The present invention relates to the mobile communication technology field, more particularly, relate to data rearrangement and recombination method and base station thereof in the wireless communication system of a kind of suitable Long Term Evolution (LTE) network.
Background technology
Universal mobile telecommunications system (Universal Mobile Telecommunication Systems, abbreviation UMTS) is the 3-G (Generation Three mobile communication system) that adopts the WCDMA air interface.Usually also the UMTS system is called the WCDMA communication system.On function, network element can be divided into Radio Access Network (Radio Access Network, abbreviation RAN) and core net (Core Network, abbreviation CN).Wherein Radio Access Network is used to handle all and wireless function associated, and core net is handled all voice calls in the UMTS system, data connect and the exchange and the route of external network.The UMTS system configuration as shown in Figure 1, its network element comprises subscriber equipment (User Equipment, be abbreviated as UE) be terminal 101, UMTS Terrestrial radio access network (UMTS Terrestrial Radio Access Network is abbreviated as UTRAN) 102, the Circuit Switching Network (3G CS) 103 of 3G core network, the packet switching network (3G PS) 104 of 3G core network, the functional entity 105 that comprises the service application territory, external network PSTN 106 and external network Internet net 107.
The main interface that the network of universal mobile telecommunications system constitutes as shown in Figure 2, wherein, the Uu interface is the wave point of WCDMA, be used to allow UE be linked into the fixed network part of UMTS system by the Uu interface, and the Iu interface is the interface that connects UTRAN and CN.The Iur interface is the interface that is connected between each RNC (abbreviation of radio network controller), and the Iur interface is the distinctive interface of UMTS system, is used for the mobile management to the RAN travelling carriage.Iub interface is the interface that connects Node B and RNC.
The protocol architecture of wave point Uu among Fig. 2 as shown in Figure 3, each abbreviation is listed as follows among Fig. 3: GC: general controls; BMC: broadcasting/multileaving control protocol; Nt: notice; RLC: Radio Link control; DC: special-purpose control; MAC: medium access control; RRC: Radio Resource control; PHY: physical layer; PDCP: packet data convergence protocol.
In Radio interface protocols, be divided into three protocol layers from bottom to top, physical layer PHY (L1), data link layer (L2) and network layer (L3), wherein, data link layer comprises four sublayers such as MAC, RLC, PDCP, BMC.
Wherein, the function of MAC (abbreviation of medium access control) sublayer comprises: the mapping between logic channel and the transmission channel; For each transmission channel is selected suitable transformat; Processed between the UE data flow; Adopt the processed of dynamically pre-arrangement method between the UE; Processed between the data flow of the last several users of DSCH (abbreviation of DSCH Downlink Shared Channel) and FACH (abbreviation of forward access channel); The sign of UE on the Common transport channel; For sending the transmission block of physical layer to by transmission channel, and will be high-rise PDU (abbreviation of protocol Data Unit) from the transmission block multiple connection of physical layer by transmission channel with high-rise PDU (abbreviation of protocol Data Unit) multiple connection; Traffic supervision; The dynamic transmission channel type switches; Transparent RLC encrypts; The access service rank is selected.
RLC (Radio Link control abbreviation) sublayer function comprises: cut apart and the transmission of reorganization, series connection, filling, user data, error detection, send that high-rise PDU, duplicate detection, Flow Control, non-authentication data transfer mode sequence number check according to the order of sequence, protocol error detection and recovery, encryption, hang-up and restore funcitons.
PDCP (abbreviation that grouped data is assembled) sublayer function comprises: carry out the header suppression and the decompression of IP traffic in transmission and receiving entity respectively; The combination of header compression method correspondence and particular network layer, transport layer or upper-layer protocol; Transmitting user data; PDCP-SDU (the SDU: the abbreviation of Service Data Unit) be forwarded to rlc layer that Non-Access Stratum is sent here; A plurality of different RB (abbreviation of radio bearer) are multiplexed into same RLC entity.
BMC (broadcast/multi broadcast control) sublayer function comprises: the storage of cell broadcast messages, business amount monitor and for the scheduling of CBS request Radio Resource, BMC message, send BMC message, transmit cell broadcast messages to high-rise (NAS) to UE.
The entity of RLC sublayer is supported three types of business altogether, and transparent mode (TM) is professional, no affirmation mode (UM) is professional and affirmation mode business (AM).RLC sub-layer entities model as shown in Figure 4.Transparent mode TM business is finished by independently sending and receive the transparent mode entity.Sending entity receives SDU from high level and is divided into suitable RLC PDU, need not add any expense, sends MAC to by a certain channels such as BCCH, PCCH, SHCCH, SCCH, DTCH.Receiving entity receives PDU from media access control sublayer, again these PDU is reassembled into RLC SDU and sends the upper strata to.
No affirmation mode Unified Message Service is finished by independently sending and receive no affirmation mode entity 4.Sending entity receives SDU from high level and is divided into the RLC PDU of suitable size or different SDU are connected to form a RLC PDU, encloses a RLC head and put into transmit buffer to send it to media access control sublayer by some logic channels.Receiving entity receives PDU by a certain logic channel from media access control sublayer, decaptitates and it is reassembled into SDU to send to high level.
Affirmation mode AM business is to be finished by the transmission of an associating and confirmation of receipt pattern entity.Send and receive two types PDU-control PDU and professional PDU.The transmitter side entity receives SDU from high level to be cut apart or connects into the professional PDU of RLC, and an additional RLC head is put into and sent and retransmission buffer sends it to media access control sublayer by one to two logic channel.Under affirmation mode, the professional PDU of all transmissions needs the affirmation of peer-entities whether to decide re-transmission.Control PDU be generate by RLC entity self some at status report that receives PDU and reset request etc.The receiver side entity receives PDU from media access control sublayer, extracts incidentally state information, puts into reception buffer, wait for that complete PDU reorganization SDU sends to the upper strata, or sending wrong confirmation of receipt by its transmitter side again requires peer-entities to retransmit PDU.
For media access control sublayer, the structure of UE and UTRAN side is different, respectively as Fig. 5, shown in Figure 6.According to WCDMA version R6, receiving terminal rearrangement scheme has following several mechanism:
1, the professional recombination mechanism of resetting of AM:
In the AM mode business,, need a windowing mechanism and support reordering function for supporting to retransmit.Window is (VR (R), VR (MR)), and wherein VR (R) is the next PDU sequence number that receives according to the order of sequence, and VR (MR)=VR (R)+Configured_Rx_Window_Size, buffer memory wait for that maximum is disposed by high level.
Actual window be (VR (R), VR (H)), and wherein VR (H) is the sequence number of the PDU maximum that receives, VR (H)＜=VR (MR).The mobile of window realized by the window lower bound by upgrading.Receive with window in the PDU of sequence number inequality be buffered in and receive in the buffer memory, receive that the PDU of sequence number outside window is deleted.Can only passive wait VR (R) as receiving terminal, there is not method control window such as timer to move.Transmitting terminal can be by timer and/or the highest number of retransmissions restriction PDU transmission rate.All start timer for each SDU that will send, carry out SDU discard (Service Data Unit abandons) and notify receiving terminal to carry out window and upgrade when timer expired or PDU reach the highest number of retransmissions, the highest number of retransmissions reaches the reset (resetting) of triggering RLC entity under the do not have SDUdiscard configured situation of (Service Data Unit is lost configuration).
Recombination mechanism can be still out of order according to the order of sequence according to what set, and indication is recombinated complete S DU and delivered to high level according to LI.
2.UM the out of order rearrangement reorganization of professional SDU
Common Unified Message Service does not need to reset owing to do not retransmit, as long as reorganization according to the order of sequence simply, when going out the PDU of active, the SDU that this PDU is related deletes.
But since R6 enters the professional back of MBMS (abbreviation of broadcasting multicast service) because MCCH cycle retransmission features is introduced the out of order recombination mechanism of MCCH receiving terminal.This mechanism also is to have a window wait initial transmission to lose the PDU of re-transmission, and in order to guarantee real-time, out of order reorganization SDU has guaranteed the receiving terminal recombination rates.
The window that uses is (VR (UOH)-OSD_Window_Size, VR (UOH)), and wherein VR (UOH) is for having received the sequence number of PDU maximum, and buffer memory waits for that maximum is disposed by high level.For receiving the PDU of sequence number in window, buffer memory gets up, and the PDU of sequence number outside window is carried out VR (UOH) upgrade, and the renewal that drives window is moved in the window upper bound.Timer Timer_OSD is used to control the renewal of VR (UOH), and VR (UOH) upgrades timer each time and resets, and all PDU are deleted in the timer expired, buffer memory.
Recombinate for the PDU that is buffered in the window, recover complete SDU and deliver to high level and no matter the SDU order according to LI indication.
3.DAR reset
DAR repeats the english abbreviation avoiding and reorder, because the MTCH selective synthesizing of MBMS and mechanism among the WCDMA R6, the problem of copy and out of order arrival can appear in the MTCH reception, therefore, introduces windowing mechanism at the MTCH receiving terminal and reorders.
Window be (VR (UDH)-DAR_Window_Size, VR (UDH)], the sequence number of PDU maximum has been received in VR (UDH) expression here, buffer memory waits for that maximum is disposed by high level.Actual window be (VR (UDR), VR (UDH)], wherein VR (UDR) is the next sequence number of delivering to high-rise PDU according to the order of sequence, promptly the PDU less than this SN is delivered to high level according to the order of sequence.VR(UDR)＞＝VR(UDH)-DAR_Window_Size。Receiving that the PDU in the actual window carries out buffer memory, receive the PDU of sequence number greater than the window upper bound, carry out the renewal of window, also is to be moved by the window upper bound to drive the window renewal.
When sequence number is after the PDU of VR (UDR) is received, in the inspection now the sequence number of the minimum PDU that is not correctly received what be, VR (UDR) is updated to this value, and all sequence numbers is delivered to high-rise the reorganization less than the PDU that upgrades back VR (UDR).If when the window reach causes VR (UDR)＜VR (UDH)-DAR_Window_Size+1, upgrade VR (UDR) for upgrading window (VR (UDH)-DAR_Window_Size, VR (UDH)] the interior minimum PDU that does not receive, VR (UDR) is updated to this SN, and all sequence numbers are delivered to high-rise reorganization less than the PDU that upgrades back VR (UDR).
Timer Timer_DAR and state variable VR (UDT) control receiver window do not move for a long time.VR (UDT) initially is made as maximum sequence number in the window, starts timer Timer_DAR simultaneously.The PDU that when sequence number is VR (UDT) is sent to high-rise reorganization in that timer is not overtime, and timer is restarted, and VR (UDT) resets to maximum sequence number in the window.If timer expiry, all sequence numbers all are admitted to high level smaller or equal to VR (UDT) with the continuous PDU of VR (UDT), VR (UDR) is updated to the minimum sequence number of not receiving in the present buffer memory, and the VR (UDT) that resets is simultaneously restarted timer for the maximum sequence number of PDU in the window.
DAR resets be different with the above two, and this functional unit is only reset and do not done reorganization, and recombination function is done at high level.
4.HSPA reset
HSPA is the abbreviation that high-speed packet inserts, and the rearrangement mechanism of HSDPA (abbreviation that high speed downlink packet inserts) is identical with DAR mechanism.Its objective is for the different process of HARQ (mixing the abbreviation of automatic repeat requests) retransmit out of order, reset according to the TSN sequence number and to guarantee that the MAC-hs PDU that receives reverts to MAC-d PDU according to the order of sequence and delivers to the MAC-d entity.
Introducing along with enhancement techniques such as HSDPA, Enhanced Uplink, for guaranteeing the competitiveness of 3GPP wireless access technology in more longer time (as 10 years or longer), someone proposes " Evolved UTRAand UTRAN " is that LTE (Long Term Evolution, Long Term Evolution) is that the Long Term Evolution of 3GPP wireless access technology need be considered.The pith of this Long Term Evolution comprises the time delay of reduction, higher user data rate, improved power system capacity and covering and for the cost of operator's reduction.For reaching above-mentioned target, the wave point of evolution and wireless network architecture all should be considered.For satisfying the demand of the various performances of this long-term evolving network (hereinafter being abbreviated as LTE), corresponding improvement all can take place in network configuration, wave point, protocol stack function.Existing protocol layer structure causes the function of a lot of repetitions, such as the re-transmission of RLC and media access control sublayer, division cascade or the like.In order to reduce to postpone and simplify agreement, the function of these repetitions must be considered to simplify.In addition, the all-IP requirement that the LTE system proposes, it is professional that promptly Network Transmission all is based on the IP bag, and the mechanism that this brand-new demand also needs to respond goes to guarantee.
In numerous network improvement projects, a lot of functions are considered to repeated and redundant among the RLC.Popular viewpoint thinks that a lot of functions among the RLC can realize in MAC at present, and therefore, RLC can be integrated in the MAC entity and go.Here we think that also the repeat function of RLC will bring unnecessary delay and complexity, and simplification merges to and goes among the MAC is the comparison reasonable plan.
The MAC structure as shown in Figure 7 and Figure 8 in the nearest LTE system that proposes.For prior art, reset mechanism for total above 4 three kinds in the WCDMA R6 system of above having discussed, can be fit to different rearrangement demands.But complex structure, functional redundancy has reduced response speed, can't be applied to existing LTE network, for example, ARQ (abbreviation of repeat requests automatically) be retransmitted and HARQ (mixing the abbreviation of automatic repeat requests) separate processes, inefficiency has increased the delay that ARQ retransmits.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of method of data rearrangement reorganization is proposed at the wireless communication system such as evolvement network, the repetition that can avoid similar functions to be provided with, simplify the base station protocol architecture, merge redundancy feature, reduce processing delay and buffer memory expense, help the mutual of two-layer re-transmission, trigger the purpose that fast ARQ retransmits thereby reach.Another object of the present invention provides a kind of base station that above-mentioned advantage reaches wireless communication system that has.
The above-mentioned technical problem of the present invention solves like this, constructs the data rearrangement and recombination method in a kind of wireless communication system, comprising:
The packet that mixes automatic re-transmission HARQ process reception is carried out verification;
The packet that verification is correct is delivered to demultiplexing unit, and demultiplexing unit carries out delivering to high-rise the re-transmission behind the demultiplexing according to the protocol Data Unit pdu header information of HARQ with HARQ PDU and realizes that unit Outer ARQ resets;
The high-rise re-transmission realized unit Outer ARQ according to the rearrangement mechanism that pre-establishes, and carries out PDU according to the PDU sequence number and resets;
SDU after the PDU that foundation rearranges recombinates and will recombinate Service Data Unit SDU according to the reorganization strategy that pre-establishes delivers to high level;
Wherein, the described rearrangement mechanism that pre-establishes is waited for scope and ARQ buffer memory wait scope by predefined sliding window control HARQ buffer memory, the New Deal data that receive are handled, detect the protocol data bag of needs reorganization or/and protocol Data Unit is lost according to above processing, carry out the reorganization of packet or/and generate feedback.
In said method, can be used for functions of retransmission for the rearrangement of automatic repeat requests ARQ entity reorganization through HARQ, but without the business of Outer ARQ functions of retransmission.
In said method, the described reorganization strategy that pre-establishes comprises, is provided with and submits SDU and the out of order SDU of submitting according to the order of sequence, if be configured to submit according to the order of sequence SDU, SDU must carry out the recovery of SDU according to the sequencing of PDU sequence number sign and submit to high level; If be configured to the out of order SDU of submitting, SDU can submit according to random order.
In said method, the ARQ buffer memory wait scope of described predefined sliding window control is to wait for lower bound by the HARQ buffer memory, and ARQ receives the PDU sequence number according to the order of sequence and the ARQ buffer memory waits for that maximum determines jointly.
In said method, the next PDU sequence number that receives according to the order of sequence as ARQ allows the minimum value of buffer memory wait to wait for maximum smaller or equal to the ARQ buffer memory to HARQ, the minimum value that the next PDU sequence number that ARQ buffer memory wait scope receives according to the order of sequence from ARQ allows buffer memory to wait for to HARQ; Wait for maximum to the minimum value that HARQ allows buffer memory to wait for greater than the ARQ buffer memory when the next PDU sequence number that ARQ receives according to the order of sequence, the ARQ buffer memory waits for that scope adds the maximum that the ARQ buffer memory is waited for from the next PDU sequence number that ARQ receives according to the order of sequence to this next one PDU sequence number.
In said method, described ARQ buffer memory waits for that maximum is disposed by high level.
In said method, the next PDU sequence number that the sequence number of the PDU maximum of receiving in the described buffer memory, HARQ buffer memory wait lower bound and ARQ receive is according to the order of sequence represented by state variable.
In said method, the next PDU that described ARQ receives according to the order of sequence is meant that the ARQ buffer memory next one wishes the PDU that receives according to the order of sequence, and all sequence numbers have all shifted out the rearrangement buffer memory less than the protocol Data Unit of this PDU.
In said method, described the New Deal data that receive are carried out that processing method is if this New Deal data cell sequence number is waited for scope greater than the HARQ buffer memory, these data are carried out buffer memory and upgraded the state variable of high Receive sequence number, carry out other state variables according to windowing mechanism and upgrade, overflow detection; Wait for scope and do not repeat the sequence number data cell, this PDU of buffer memory if this New Deal data cell sequence number is positioned at the HARQ buffer memory; Wait for scope and do not repeat the sequence number data cell if this New Deal data cell sequence number is positioned at the ARQ buffer memory, this PDU of buffer memory, and receive feedback according to the reception feedback strategy; If this New Deal data cell sequence number equals the next PDU sequence number that ARQ receives according to the order of sequence, the detection of the SDU that recombinates.
In said method, described overflow to detect be when the PDU sequence number of the highest reception is updated, the HARQ buffer memory that detect to adopt the PDU sequence number of described the highest reception to deduct configuration waits for whether the value that obtains after size parameter and the next PDU sequence number that receives according to the order of sequence waits for scope greater than the maximum ARQ buffer memory of configuration, if, then for overflowing; Detect overflow after, the receiving terminal send window overflows indication gives transmitting terminal, hangs up the peer-entities new data transmission, cancels the operation of hang-up according to the strategy that pre-establishes.
In said method, the operation that described cancellation is hung up can detect the ARQ window restoration by control of transmitting terminal timer or receiving terminal and send indication after hanging up preceding state.
In said method, the method of the protocol data bag that described detection need be recombinated is 1) if be configured to submit according to the order of sequence SDU, equal the next PDU sequence number that ARQ receives according to the order of sequence if receive sequence number, the continuous P DU that inspection begins from this PDU is up to discontinuous protocol Data Unit occurring, the SDU that contains among these continuous P DU is restructured and delivers to high level, and upgrade the corresponding state variable that receives PDU according to the order of sequence, 2) if be configured to the unordered SDU of submitting, this SDU delivers to high level as long as indicate complete SDU to be received soon in the protocols having data cell.
In said method, the method of described detection protocol data unit loss is: in ARQ buffer memory wait scope, sequence number is that the protocol Data Unit of SN is not received, if exist sequence number to be received, judge that then sequence number is that the protocol Data Unit of SN is a lost data packets greater than the protocol Data Unit of SN.
In said method, the HARQ buffer memory of described predefined sliding window control waits for that scope is by receiving the control of protocol Data Unit situation and timer; This HARQ buffer memory waits for that scope definition is that the upper bound is a sequence number of receiving the protocol Data Unit maximum, and lower bound is a sequence number maximum among the pairing PDU of overtime timer.
In said method, described timer method to set up is each protocol Data Unit that comes from the HARQ process, starts a corresponding timer; Work as timer expired, when corresponding protocol Data Unit sequence number is waited for the scope lower bound greater than the HARQ buffer memory, upgrade the HARQ buffer memory and wait for scope lower bound protocol Data Unit sequence number for this reason; When the sequence number of protocol Data Unit is waited for the scope lower bound less than the HARQ buffer memory, stop corresponding timer; When protocol Data Unit according to the order of sequence or during the out of order SDU that recombinates out whole, stop corresponding timer.
In said method, described timer size is disposed by high level.
Another purpose of the present invention realizes by a kind of base station of structure, this base station can be used as a unit in the wireless communication system, this wireless communication system is at wireless terminal and comprise between other communication equipment of other wireless terminal providing to small part by radio communication and connect that it is characterized in that: this base station depends on the corresponding steps of the above-mentioned data rearrangement and recombination method of the present invention as receiving terminal work.
Implement data rearrangement and recombination method and base station thereof in the wireless communication system that can be used for the LTE system provided by the invention, system compares with existing wireless communications, owing to the RLC of original R6 system is reset and the HARQ rearrangement is all finished in the ARQ entity, and the realization in a physical entity at HARQ and ARQ re-transmission, propose function and merge simplification and specific implementation mechanism, differentiation according to window and timer control carrying out HARQ reception buffer memory and ARQ reception buffer memory, more rapid triggering ARQ retransmits and reduces owing to reset the processing delay that brings, and has also reduced by two re-transmissions simultaneously and has merged influencing each other of resetting.According to the present invention, reset functions of retransmission and can realize that all rearrangement can once be finished in the base station, two-layerly reset separately and need not to be divided into, can avoid the increase of ARQ retransmission delay time, reduced system complexity, improved speed.
Description of drawings
Fig. 1 is the system configuration schematic diagram of Radio Access Network in the universal mobile telecommunications system;
Fig. 2 is the structural representation of main interface in the universal mobile telecommunications system;
Fig. 3 is the structural representation of Radio interface protocols in the universal mobile telecommunications system;
Fig. 4 is the structural representation of Radio Link control RLC physical model;
Fig. 5 is the MAC structural representation of user equipment side;
Fig. 6 is the MAC structural representation of network side;
Fig. 7 is the MAC structural representation of UL among the eNB in the LTE network;
Fig. 8 is the MAC structural representation of subscriber equipment DL in the LTE network;
Embodiment
Data rearrangement and recombination method in the wireless communication system of the present invention, can be applied to the LTE network, also can be applied to other conventional wireless communication systems, the rearrangement recombination method of this data, its core is that receiving terminal is reset/recombinated according to its sequence number SN receiving the packet behind the demultiplexing, and the buffer memory condition that receives is set, and the data of passing through after resetting are carried out subsequent treatment according to this reception buffer memory condition.In the method for the invention, SDU that each receives or PDU all have sequence number SN, and the SN that is used to reset reorganization here is the unique SN of ARQ, promptly can be to reuse high-rise SDU SN, also can be the ARQ SN that transmitting terminal ARQ adds.If there is the branch cross-talk sequence number behind the retransmission division cascade, the polylith sheet end of each SN correspondence all need be collected.The ARQ unit is reset/is recombinated according to its sequence number SN exactly; Rearrangement be to receive with send between the out of order and rearrangement carried out, reorganization is by the PDU SDU that recombinates.Reorganization comprises out of order reorganization of submitting and the reorganization of submitting according to the order of sequence.The PDU that HARQ resets needs according to HARQ pdu header information delivers to each ARQ rearrangement recomposition unit and resets.
Be example discussion data rearrangement and recombination method of the present invention with the LTE network, be primarily aimed at two kinds of business of AM and UM.Unified Message Service is only used the HARQ business, and the mechanism of resetting is only out of order at HARQ.
For the AM business, each HARQ process of receiving terminal is received corresponding TB (transmission block), if verification is correct, delivers to the MUX unit and is demultiplexed into each ARQ entity.ARQ rearrangement functional unit carries out the PDU rearrangement according to the PDU sequence number and reorganization SDU delivers to high level, triggers to retransmit or delete corresponding re-transmission buffer memory PDU.For Unified Message Service, each HARQ process of receiving terminal is received corresponding TB, if verification is correct, delivers to the MUX unit and is demultiplexed into each ARQ entity, and for UM, the ARQ entity is not done re-transmission, only does division cascade.Reset functional unit and retransmit out of order the ordering, and reorganization SDU delivers to high level at HARQ.For the real time business that some HARQ forbids, need not to reorder.
For realizing resetting, method of the present invention is provided with HARQ and receives buffer memory and ARQ reception buffer memory, is respectively applied for the data that buffer memory waits for that HARQ and ARQ retransmit.Owing to adopt a buffer memory to come buffer memory to wait for that HARQ and ARQ retransmit bring out of order, the present invention proposes the mechanism of rearrangement, comprise window control and timer controlling mechanism, be used to distinguish that HARQ retransmits out of order wait and ARQ retransmits out of order wait.Buffer memory is discussed below and is reset mechanism.
1, HARQ buffer memory
Some parameters and state variable are defined as follows:
Highest_received_SN represents the PDU highest sequence number received in the buffer memory;
Next_expected_SN represents the next PDU sequence number of delivering to high level or next functional unit according to the order of sequence in the buffer memory;
HARQ_RcvWindow_Size represents the HARQ buffer memory wait maximum of the suitable QoS of high-rise configuration;
The HARQ buffer window is defined as (Highest_received_SN-HARQ_Window_Size, Highest_received_SN).
2, ARQ buffer window
ARQ_RcvWindow_Size is that the ARQ buffer memory of high-rise configuration is waited for maximum.
The definition of ARQ buffer window comprises:
If Next_expected_SN＜Highest_received_SN-HARQ_Window_Size, definition ARQ buffer window is: (Next_expected_SN, Highest_received_SN-HARQ_Window_Size);
If Highest_received_SN-HARQ_Window_Size-Next_expected_SN＞ARQ_RcvWindow_Size, definition ARQ buffer window be (Next_expected_SN, Next_expected_SN+ARQ_RcvWindow_Size);
3, the relation of ARQ buffer memory and HARQ buffer memory
3-1) merge detection: if Next_expected_SN＜Highest_received_SN-HARQ_Window_Size, HARQ overlaps into one with the ARQ buffer memory.Highest_received_SN-HARQ_Window_Size-Next_expected_SN＜ARQ_RcvWindow_Size。
3-2) overflow detection: if Highest_received_SN-HARQ_Window_Size-Next_expected_SN＞ARQ_RcvWindow_Size, the generation window overflows, the receiving terminal send window overflows indication gives transmitting terminal, and the corresponding ARQ entity of transmitting terminal new data transmission will be suspended promptly can only retransmit can not carry out new data transmission.
3-3) disconnection detects: if at this moment the HARQ buffer window can appear in Highest_received_SN-HARQ_Window_Size-Next_expected_SN＜ARQ_RcvWindow_Size and the ARQ buffer window disconnects, originally two windows are overlapping, can send to hang up by receiving terminal and finish indication, also can be configured according to the state that retransmits buffer memory by transmitting terminal to transmitting terminal.
4, the HARQ receive window is with reference to the border
It is machine-processed as resetting with reference to the border that the present invention also can set the HARQ receive window.Promptly definition: HARQ_RcvWindow_Edge is the HARQ buffer memory of reality and the border of ARQ buffer memory, the PDU sequence number of receiving according to the order of sequence corresponding to next HARQ on the numerical value.HARQ_RcvWindow_Edge＜＝Highest_received_SN-HARQ_Window_Size。When the window upper bound is that Highest_received_SN upgrades the window lower bound renewal that forms, exist in buffer memory if SN is the PDU of Highest_received_SN-HARQ_Window_Size, window actual lower bound HARQ_RcvWindow_Edge is updated to the PDU sequence number of not receiving minimum in the present window.The ARQ window becomes then that (Next_expected_SN, HARQ_RcvWindow_Edge), other ARQ associative operations are with above-mentioned rearrangement mechanism.
Definition timer Timer_HARQ (T_SN) is used to control the HARQ window and moves, and T_SN initially is made as maximum sequence number Highest_received_SN in the buffer memory, starts each timer Timer_HARQ simultaneously.When sequence number be the PDU of T_SN the not overtime T_SN of being＜=when HARQ_RcvWindow_Edge received, timer was restarted at timer, T_SN resets to maximum sequence number in the window.If timer expiry, T_SN＞HARQ_RcvWindow_EdgeHARQ_RcvWindow_Edge is updated to (Highest_received_SN, T_SN) the PDU smallest sequence number of not receiving in, the T_SN that resets simultaneously is the maximum sequence number of PDU in the window, restarts timer.
5, adopt timer as the mechanism of resetting
Receive from the MUX unit that at every turn an ARQ PDU just starts timer Timer_Rcv, state variable HARQ_RcvWindow_EdgeT represents HARQ receive window border, is the overtime sequence number that receives the PDU maximum of timer.Highest_received_SN represents the PDU highest sequence number received in the buffer memory.Next_expected_SN represents the next PDU sequence number of delivering to high level or next functional unit according to the order of sequence in the buffer memory.Next_expected_SN can be less than HARQ_RcvWindow_Edge_T.
ARQ_RcvWindow_Size is that the ARQ buffer memory of high-rise configuration is waited for maximum (window size) upper limit.ARQ receives buffer memory and still controls with window, receive window is (Next_expected_SN, HARQ_RcvWindow_Edge_T) general cache waits for that maximum is smaller or equal to ARQ_RcvWindow_Size, if HARQ_RcvWindow_Edge_T-Next_expected_SN＞ARQ_RcvWindow_Size, the ARQ window is decided to be (Next_expected_SN, Next_expected_SN+ARQ_RcvWindow_Size) the receiving terminal send window overflows indication to transmitting terminal, and the corresponding ARQ entity of transmitting terminal new data transmission will be suspended promptly can only retransmit can not carry out new data transmission.
HARQ and ARQ buffer memory wait for that maximum (being window size) can be configured by high level according to business.
Embodiment one
As the PDU that receives SN=x, carry out following processing (step number can be represented execution sequence, can not be execution sequence also):
Step 1
If x is in that (Next_expected_SN sets up within Highest_received_SN), if this SN corresponding data exists in buffer memory then deletes this data; If x not (Next_expected_SN, Highest_received_SN) within, according to sequence number PDU is put into buffer memory;
Step 2:
Step 3:
Embodiment two
As the PDU that receives SN=x, carry out following processing (step number can be represented execution sequence, can not be execution sequence also):
Step 1:
If x (Next_expected_SN, Highest_received_SN) within
If this SN corresponding data exists in buffer memory then deletes this data, otherwise, according to sequence number PDU is put into buffer memory };
Step 2:
Step 3:
If SN equals the PDU of HARQ_RcvWindow_Edge in buffer memory, then
Check whether have with the continuous PDU of this PDU sequence number in buffer memory, HARQ_RcvWindow_Edge is updated to minimum discontinuous PDU sequence number again; }
Step 4:
Trigger the report of principle triggering corresponding state according to HARQ_RcvWindow_Edge that upgrades and status report;
Step 5:
Step 6:
At the same time, following timer operation (step number can be represented execution sequence, can not be execution sequence also) is arranged:
Step 1:
If PDU is arranged in the buffer memory, Timer_HARQ is not activated, then
Trigger timer Timer_HARQ;
T_SN is set to PDU sequence number maximum in the buffer memory.}
Step 2:
If before the timer expired, HARQ_RcvWindow_Edge＞=T_SN then stops timer;
Step 3:
Step 4:
Embodiment three
As the PDU that receives SN=x, then carry out following steps, number of steps can be represented execution sequence, can not be execution sequence also.
1, triggers timer Timer_cv;
Claims (14)
1. the data rearrangement and recombination method in the wireless communication system is characterized in that, comprising:
The packet that mixes automatic re-transmission HARQ process reception is carried out verification;
The packet that verification is correct is delivered to demultiplexing unit, and demultiplexing unit carries out delivering to high-rise the re-transmission behind the demultiplexing according to the protocol Data Unit pdu header information of HARQ with HARQ PDU and realizes that unit Outer ARQ resets;
The high-rise re-transmission realized unit Outer ARQ according to the rearrangement mechanism that pre-establishes, and carries out PDU according to the PDU sequence number and resets;
SDU after the PDU that foundation rearranges recombinates and will recombinate Service Data Unit SDU according to the reorganization strategy that pre-establishes delivers to high level;
Wherein, the described rearrangement mechanism that pre-establishes is waited for scope and ARQ buffer memory wait scope by predefined sliding window control HARQ buffer memory, the New Deal data that receive are handled, detect the protocol data bag of needs reorganization or/and protocol Data Unit is lost according to above processing, carry out the reorganization of packet or/and generate feedback.
2. method according to claim 1 is characterized in that, can be used for the functions of retransmission through HARQ for the rearrangement of automatic repeat requests ARQ entity reorganization, but without the business of Outer ARQ functions of retransmission.
3. method according to claim 1, it is characterized in that: the described reorganization strategy that pre-establishes comprises, be provided with and submit SDU and the out of order SDU of submitting according to the order of sequence, if be configured to submit according to the order of sequence SDU, SDU must carry out the recovery of SDU according to the sequencing of PDU sequence number sign and submit to high level; If be configured to the out of order SDU of submitting, SDU can submit according to random order.
4. method according to claim 1 is characterized in that: the ARQ buffer memory wait scope of described predefined sliding window control is to wait for that by the HARQ buffer memory lower bound, ARQ receive the PDU sequence number according to the order of sequence and the ARQ buffer memory waits for that maximum determines jointly.
5. method according to claim 4, it is characterized in that: the next PDU sequence number that receives according to the order of sequence as ARQ allows the minimum value of buffer memory wait to wait for maximum smaller or equal to the ARQ buffer memory to HARQ, the minimum value that the next PDU sequence number that ARQ buffer memory wait scope receives according to the order of sequence from ARQ allows buffer memory to wait for to HARQ; Wait for maximum to the minimum value that HARQ allows buffer memory to wait for greater than the ARQ buffer memory when the next PDU sequence number that ARQ receives according to the order of sequence, the ARQ buffer memory waits for that scope adds the maximum that the ARQ buffer memory is waited for from the next PDU sequence number that ARQ receives according to the order of sequence to described next PDU sequence number.
6. method according to claim 5 is characterized in that, described ARQ buffer memory waits for that maximum is disposed by high level.
7. method according to claim 5 is characterized in that, the next PDU that described ARQ receives according to the order of sequence is meant that the ARQ buffer memory next one wishes the PDU that receives according to the order of sequence, and all sequence numbers have all shifted out the rearrangement buffer memory less than the protocol Data Unit of this PDU.
8. method according to claim 1, it is characterized in that, described the New Deal data that receive are carried out that processing method is if this New Deal data cell sequence number is waited for scope greater than the HARQ buffer memory, these data are carried out buffer memory and upgraded the state variable of high Receive sequence number, carry out other state variables according to windowing mechanism and upgrade, overflow detection; Wait for scope and do not repeat the sequence number data cell, this PDU of buffer memory if this New Deal data cell sequence number is positioned at the HARQ buffer memory; Wait for scope and do not repeat the sequence number data cell if this New Deal data cell sequence number is positioned at the ARQ buffer memory, this PDU of buffer memory, and receive feedback according to the reception feedback strategy; If this New Deal data cell sequence number equals the next PDU sequence number that ARQ receives according to the order of sequence, the detection of the SDU that recombinates.
9. method according to claim 8, it is characterized in that, described overflow to detect be when the PDU sequence number of the highest reception is updated, the HARQ buffer memory that detect to adopt the PDU sequence number of described the highest reception to deduct configuration waits for whether the value that obtains after size parameter and the next PDU sequence number that receives according to the order of sequence waits for scope greater than the maximum ARQ buffer memory of configuration, if, then for overflowing; Detect overflow after, the receiving terminal send window overflows indication gives transmitting terminal, hangs up the peer-entities new data transmission, cancels the operation of hang-up according to the strategy that pre-establishes.
10. method according to claim 9 is characterized in that, the operation that described cancellation is hung up can detect the ARQ window restoration by control of transmitting terminal timer or receiving terminal and send indication after hanging up preceding state.
11. method according to claim 1, it is characterized in that, the method of the protocol data bag that described detection need be recombinated is 1) if be configured to submit according to the order of sequence SDU, equal the next PDU sequence number that ARQ receives according to the order of sequence if receive sequence number, the continuous P DU that inspection begins from this PDU is up to discontinuous protocol Data Unit occurring, the SDU that contains among these continuous P DU is restructured and delivers to high level, and upgrade the corresponding state variable that receives PDU according to the order of sequence, 2) if be configured to the unordered SDU of submitting, this SDU delivers to high level as long as indicate complete SDU to be received soon in the protocols having data cell.
12. method according to claim 1, it is characterized in that, the method of described detection protocol data unit loss is: in ARQ buffer memory wait scope, sequence number is that the protocol Data Unit of SN is not received, if exist sequence number to be received, judge that then sequence number is that the protocol Data Unit of SN is a lost data packets greater than the protocol Data Unit of SN.
13. method according to claim 1 is characterized in that, the HARQ buffer memory of described predefined sliding window control waits for that scope is by receiving the control of protocol Data Unit situation and timer; This HARQ buffer memory waits for that scope definition is that the upper bound is a sequence number of receiving the protocol Data Unit maximum, and lower bound is a sequence number maximum among the pairing PDU of overtime timer.
14. base station, as a unit in the wireless communication system, this wireless communication system is at wireless terminal and comprise between other communication equipment of other wireless terminal providing to small part by radio communication and connect, and it is characterized in that: this base station depends on the corresponding steps of method of claim 1 as receiving terminal work.
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| CN2006100346359A CN101043301B (en) | 2006-03-22 | 2006-03-22 | Data rearrangement and recombination method in wireless communication system and its base station |
| DE602007011221T DE602007011221D1 (en) | 2006-03-03 | 2007-02-06 | METHOD FOR RECOMBINING DATA IN A WIRELESS COMMUNICATION SYSTEM AND DEVICE THEREFOR |
| AT07702289T ATE492100T1 (en) | 2006-03-03 | 2007-02-06 | METHOD FOR REASSUMING DATA IN A WIRELESS COMMUNICATIONS SYSTEM AND DEVICE THEREFOR |
| PCT/CN2007/000406 WO2007098676A1 (en) | 2006-03-03 | 2007-02-06 | A method for reassembling data in wireless communication system and an apparatus thereof |
| EP07702289A EP1993241B1 (en) | 2006-03-03 | 2007-02-06 | A method for reassembling data in wireless communication system and an apparatus thereof |
| US12/203,799 US20090046626A1 (en) | 2006-03-03 | 2008-09-03 | Method and device for reordering data in wireless communication system |
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