CN101615988A - The dispatching method that mixes automatic repeat requests - Google Patents
The dispatching method that mixes automatic repeat requests Download PDFInfo
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Abstract
The invention provides the dispatching method of a kind of HARQ, may further comprise the steps: for semi-persistent scheduling is reserved at least one HARQ process; A HARQ bust this of a HARQ process in the HARQ process is reserved in UE decoding, and on this HARQ process to there is semi-persistent scheduling opportunity between the opportunity that HARQ retransmits next time; Use dynamic dispatching to replace semi-persistent scheduling or still use semi-persistent scheduling and cancel next time that HARQ retransmits.HARQ dispatching method of the present invention is simply clear, processing is convenient, reliability is high, delay is little.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of dispatching method that mixes automatic repeat requests.
Background technology
Fig. 1 shows 3G (Third Generation) Moblie Long Term Evolution (Long Term Evolution, abbreviate LTE as) Radio interface protocols downstream layers 2 structures of " universal land radio access web of evolution (the Evolved UniversalTerrestrial Radio Access Network; abbreviate E-UTRAN as; form, therefore also can be called base station eNB) " of system by base station eNB.At medium access control (Media Access Control, abbreviate MAC as) protocol layer, there is scheduling/processed (Scheduling/Priority handling) functional entity, wherein, scheduling feature is supported dynamic dispatching (Dynamic scheduling) and semi-persistent scheduling (or being called semi-persistent scheduling) (Semi-persistent Scheduling); The processed function is supported the processed of same subscriber equipment (User Equipment abbreviates UE as, i.e. terminal) Different Logic interchannel, also supports to carry out processed between the different UEs by dynamic dispatching.
E-UTRAN (Evolved UMTS Terrestrial Radio Access Network, land radio access web) supports to mix automatic repeat requests (Hybrid ARQ abbreviates HARQ as) function.Modes such as HARQ adopts that N road concurrent process is stopped send and retransmit transmission block (Transport Block abbreviates TB as) between layer 1 (referring to physical layer) peer-entities, are used to improve the reliability that transmission block successfully sends.These HARQ processes and HARQ entity are associated, the HARQ entity retransmits in the asynchronous self adaptation of descending support, refer to dispatch by 1/ layer of 2 (L1/L2) control channel of layer the opportunity that retransmits, and can use and first different Radio Resources, the Modulation and Coding Scheme (MCS) etc. of passing.In the LTE system, 1/ layer of 2 control channel of layer refers to Physical Downlink Control Channel (Physical DownlinkControl Channel abbreviates PDCCH as).HARQ head sends initial redundancy version (the Redundancy Version of transmission block when passing, abbreviate RV as), when retransmitting, HARQ sends other redundancy versions of transmission block, HARQ is first to be passed and the same HARQ process of HARQ re-transmission use, and receiving terminal is carried out soft union operation at the redundancy versions of the re-transmission that this HARQ process buffering area will receive with the redundancy versions that the head that receives passes.HARQ Loop Round Trip Time (HARQ Round Trip Time abbreviates HARQ RTT as) refers to the shortest time interval between first biography of HARQ and the HARQ re-transmission, and after HARQ head passed, the HARQ re-transmission will just can be scheduled after the HARQ RTT time at least.Descending, each HARQ process has an explicit identifier, is called HARQ process identification (PID) (HARQ Processidentifier).When E-UTRAN carries out dynamic dispatching, need indicate the HARQ process identification (PID) to use which HARQ process to handle corresponding transmission block by PDCCH to specify UE.
Descending dynamic dispatching function is meant, descending, E-UTRAN can be by (the Cell Radio Network TemporaryIdentifier of the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI on the PDCCH, abbreviate C-RNTI as) at each Transmission Time Interval (Transmit TimeInterval, abbreviate TTI as, corresponding to a subframe (subframe)) to UE dynamic assignment resource, for example, Physical Resource Block (Physical Resource Block, abbreviate PRB as) and Modulation and Coding Scheme (Modulation and Coding Scheme abbreviates MCS as) etc.When allowing to carry out descending reception ((DRX) controlled by discontinuous reception functionality), UE always monitors PDCCH, thereby is that possible resource allocation is found in descending reception.When being used for descending scheduling, mainly carries PDCCH the downlink resource assignment information, main contents comprise information such as Resource Block RB assignment information, transformat (Transport Format abbreviates TF as) or Modulation and Coding Scheme (MCS), HARQ information, transmission power control TPC information, Radio Network Temporary Identifier RNTI/ cyclic redundancy check (CRC).UE sends affirmation/non-affirmation response message ACK/NACK that feedback is mixed automatic repeat requests by Physical Uplink Control Channel (Physical Uplink Control Channel abbreviates PUCCH as) to downlink data.
Descending semi-persistent scheduling is meant that descending, E-UTRAN can send the lasting downlink resource of distribution for the HARQ first of UE be the predefine resource, comprises Physical Resource Block PRB, Modulation and Coding Scheme MCS etc.When needing, retransmission information is indicated with explicit signaling by PDCCH, and promptly HARQ retransmits and uses dynamic dispatching.Have at UE during the subframe (Subframe) of persistent resource,, then think the descending transmission of carrying out in the resource of the corresponding with good grounds persistent assignments of TTI if UE does not find its C-RNTI on PDCCH.In addition, have at UE during the subframe of persistent resource, if UE has found its C-RNTI on PDCCH, then UE uses the resource allocation of PDCCH indication to substitute the distribution of (Override) persistent resource at corresponding TTI, and persistent resource is not decoded.Typically, semi-persistent scheduling is applied to the VoIP business, for the persistent resource of its distribution is the cycle with 20ms.Semi-persistent scheduling carries out initial configuration by Radio Resource control (Radio Resource Control abbreviates RRC as) signaling, for example distributes the cycle (Periodicity) of semi-persistent scheduling.The activation of semi-persistent scheduling (Activation) is by PDCCH control, and PDCCH indicates by special C-RNTI, this special C-RNTI during with dynamic dispatching employed C-RNTI different.
In descending semi-persistent scheduling, the first biography of HARQ used persistent resource, only use a PDCCH signaling when activating persistent resource, UE stores assigned persistent resource, and first biography of later HARQ no longer needs by information such as PDCCH indication HARQ process identification (PID)s.HARQ retransmits and uses asynchronous adaptive mode to carry out dynamic dispatching, and each re-transmission all needs by information such as PDCCH indication HARQ process identification (PID)s.When receiving the HARQ re-transmission, UE can't know employed HARQ process when HARQ head passes, and therefore also can't carry out soft union operation at desired HARQ process buffering area.The problems referred to above are described as shown in Figure 2, and HARQ is first to be passed for the preallocated resource of lasting scheduling is used for, and is positioned at subframe N1, N2, N3, and the time interval of establishing between above-mentioned per two adjacent sub-frame is 20ms; Carry out HARQ by dynamic dispatching and retransmit, retransmit employed HARQ process identification (PID) by the PDCCH indication, HARQ retransmits and is positioned at subframe X1, X2, X3.The HARQ process of use when not having HARQ process identity information, UE not to know the first biography of HARQ when passing owing to HARQ is first, although HARQ has indicated the HARQ process identity information when retransmitting on PDCCH, UE can't associate both.
For addressing the above problem, mainly contain the following feasible scheme at present:
Scheme one: do not reserve the HARQ process, pass, use the buffering area of a free time and the interim HARQ sign in inside to be associated for HARQ is first for semi-persistent scheduling.This scheme need be carried out some restrictions to the scheduling that HARQ retransmits, for example, base station eNB is after receiving that the use persistent resource carries out the first non-affirmation response message NACK that passes of HARQ, need at first dispatch its corresponding HARQ and retransmit, employed HARQ sign is related when then interim HARQ sign being retransmitted with this HARQ; Needs retransmit if there are a plurality of HARQ head according to persistent resource to pass all, then dispatch corresponding HARQ successively according to the first order that passes of HARQ and retransmit; Also there is the extra restriction of some abnormal conditions needs when mutual in this scheme with dynamic dispatching.In general, although this scheme does not need to reserve the HARQ process, favourable for improving throughput and peak data rate to a certain extent, complexity is higher, and reliability is relatively low.
Scheme two: for semi-persistent scheduling is reserved a HARQ process, the buffering area of this HARQ process is divided into two parts in order to storing two memory blocks, and the different value of the new data indication field (NDI) in the PDCCH signaling is distinguished above-mentioned two transmission blocks when retransmitting with HARQ.The problem of reserving a HARQ process existence is: retransmit when the first biography of the HARQ that carries out according to certain persistent resource needs carry out repeatedly HARQ, and HARQ retransmits the subframe be positioned at when surpassing the shared subframe position of next persistent resource, if there is new data need utilize this persistent resource to carry out the first biography of HARQ, then Dui Ying harq buffer district need be cleared storing new transmission block, thereby the pairing HARQ of its previous persistent resource retransmits and has to abandon.For example, the HARQ entity is supported 8 parallel HARQ processes, and HARQ RTT is 8ms, and when semi-persistent scheduling was used for the VoIP business, the every 20ms of persistent resource was a upstate.Then twice persistent resource subframe between can allow 2 HARQ to retransmit at most, the subframe position of 20ms after the first biography of last once HARQ, the i.e. subframe position that can use at persistent resource next time, if there is new transmission block to need to send, then HARQ process buffering area need be cleared, and new HARQ is first to be passed to carry out.If at this moment the HARQ of previous transmission block retransmits and has carried out 2 times, but still not success, also can't carry out the 3rd time and more times HARQ re-transmission.The description of the problems referred to above as shown in Figure 2, be made as semi-persistent scheduling and reserve HARQ process X, the HARQ process number of this reservation can be notified UE by base station eNB by RRC signaling or PDCCH signaling, so UE knows first biography of HARQ and HARQ re-transmission and all can use HARQ process X, has solved the related question that first biography of HARQ and HARQ retransmit.But, only allowing to carry out twice HARQ between subframe N1 and N2 retransmits, if new transmission block is arranged at subframe N2 place, then need carry out the first biography of new HARQ in this position, so the HARQ re-transmission for subframe N1 also needs to use the transmission block of new reception to replace the content in original harq buffer district even without success, thereby causes taking defeat for the transmission block of subframe N1.If continue to retransmit the redundancy versions of the pairing transmission block of subframe N1 at subframe X3 place, then may cause also taking defeat for the transmission block of subframe N2, because after subframe N2 reaches, the content in the harq buffer district is corresponding to the first redundancy versions that passes of the HARQ of subframe N2.This programme is divided into two parts with the buffering area of HARQ process and has solved the problems referred to above.Because use the needed buffering area of its transmission block of business of semi-persistent scheduling less, it is feasible therefore the harq buffer of correspondence being divided into two parts.HARQ process of this scheme reservation is also relative less to the influence of throughput and peak data rate, and shortcoming is the operation relative complex for the harq buffer district, needs the extra definition special behavior different with existing HARQ flow process.
Scheme three: be that semi-persistent scheduling reserves a HARQ process, and dynamically reserve other idle HARQ processes according to actual needs and be used for semi-persistent scheduling.Existing problem when dynamically reserving HARQ process of only reservation that other HARQ processes mention in also can solution two in this scheme, relative less for the influence of throughput and peak data rate, resource utilization is higher; Shortcoming is complicated by the operation of dynamic reservation of PDCCH and release HARQ process, reliability is lower, the situation that has reservation or release failure, thereby cause HARQ to retransmit failure or waste of radio resources phenomenon, and detect the mechanism that above-mentioned error situation need be extra, also can bring new complexity and delay.
Scheme four: reserve two or more HARQ processes and be used for semi-persistent scheduling, two or more HARQ processes use persistent resource to carry out the first biography of HARQ in turn, with system-frame (System Frame Number, abbreviate SFN as)+subframe (Subframe) distinguishes different HARQ process and sends opportunity, thus will HARQ separately retransmit and the first biography of HARQ is associated.This scheme is equivalent to the cycle of the shared subframe position of persistent resource has been enlarged for one of them HARQ process of being reserved.For example when having reserved two HARQ processes and be used for semi-persistent scheduling, two situations that the HARQ process is used in turn, with the VoIP business is example, for one of them HARQ process, the cycle that is equivalent to persistent resource is expanded as 40ms from 20ms, so can allow 4 HARQ to retransmit at most between the shared subframe of twice available persistent resource, retransmit probability of successful thereby improved HARQ.In the LTE system, 1 SFN is made up of 10 subframes, and each subframe 1ms is total to 10ms, so between twice available persistent resource of VoIP business 2 SFN are arranged.When two HARQ processes were used persistent resource in turn, for one of them HARQ process, the cycle of its persistent resource was 4 SFN.Such scheme is reserved HARQ process x, y and is used for semi-persistent scheduling as shown in Figure 3, and the persistent resource of HARQ process x is positioned at subframe N1, N3... etc., is used to carry out the first biography of HARQ; The persistent resource of HARQ process y is positioned at subframe N2... etc., is used to carry out the first biography of HARQ.Subframe N1, N2, N3 lay respectively in system-frame SFN1, SFN3, the SFN5.The subframe that the HARQ of HARQ process x retransmits the place is N1_X1, N1_X2, N1_X3, and the subframe that the HARQ of HARQ process y retransmits the place is N2_X1.Because two HARQ process use harq buffer districts separately, the HARQ that therefore crosses over the persistent resource border retransmits N1_X3 does not influence HARQ re-transmission N2_X1.The advantage of this scheme is simply clear, and shortcoming is bigger to the influence of throughput and peak data rate.Because the HARQ that in most cases needs not exceed more than 2 times retransmits, reserve 2 or more HARQ processes and be used for semi-persistent scheduling and will waste Radio Resource.The HARQ process that this scheme further is optimized for above-mentioned reservation can be distributed to the dynamic dispatching use when being not used in semi-persistent scheduling, but this has improved the complexity of this scheme greatly, and the gain that brings is limited.
The common trait of scheme two, scheme three, scheme four is to be that semi-persistent scheduling reserves the HARQ process and retransmit and the first related question that passes of HARQ to solve HARQ, and difference is to retransmit processing under the subframe border condition of crossing the persistent resource place for HARQ.
Although above-mentioned four kinds of schemes can solve the existing the problems referred to above of descending semi-persistent scheduling, these four kinds of schemes all exist complexity height, shortcoming that reliability is low.
Summary of the invention
The present invention aims to provide the dispatching method of a kind of HARQ, to solve such scheme complexity height, problem that reliability is low.
Technical scheme of the present invention provides the dispatching method of a kind of HARQ, may further comprise the steps: for semi-persistent scheduling is reserved at least one HARQ process; A HARQ bust this of a HARQ process in the HARQ process is reserved in UE decoding, and on this HARQ process to there is semi-persistent scheduling opportunity between the opportunity that HARQ retransmits next time; Use dynamic dispatching to replace semi-persistent scheduling or still use semi-persistent scheduling and cancel next time that HARQ retransmits.
Preferably, reserving at least one HARQ process for semi-persistent scheduling specifically comprises: the relevant information that will reserve the HARQ process disposes to UE by radio resource control signaling or PDCCH.
Preferably, reserving at least one HARQ process for semi-persistent scheduling specifically comprises: the number of configure reserved HARQ process is a fixed value; Perhaps according to the number of the cycle configure reserved HARQ process of semi-persistent scheduling.
Preferably, the HARQ process of described reservation can dynamically be dispatched shared fully, i.e. dynamic dispatching can be used the HARQ process of described reservation in any subframe, comprise that persistent resource duration of existence and persistent resource are released after.
Preferably, HARQ retransmits the HARQ process of reserving of using next time.
Preferably, the use of HARQ re-transmission next time reservation HARQ process specifically comprises: the available data in the buffering area of the redundancy versions of UE HARQ re-transmission next time and reservation HARQ process is carried out soft merging.
Preferably, use dynamic dispatching to replace semi-persistent scheduling specifically to comprise: dynamic dispatching is used and is different from other HARQ processes of reserving the HARQ process; Wherein, if to there being a plurality of semi-persistent scheduling opportunity between the opportunity that HARQ next time retransmits, then use different HARQ processes respectively for the dynamic dispatching on a plurality of semi-persistent scheduling opportunity; Perhaps the HARQ process of reserving is used in dynamic dispatching.
Preferably, to there being a plurality of semi-persistent scheduling opportunity between the opportunity that HARQ next time retransmits, use dynamic dispatching to replace semi-persistent scheduling specifically to comprise: dynamic dispatching takes place between opportunity at twice semi-persistent scheduling.
Preferably, use dynamic dispatching to replace semi-persistent scheduling specifically to comprise: the base station uses dynamic dispatching to cover semi-persistent scheduling at semi-persistent scheduling opportunity; UE is machine monitoring PDCCH when semi-persistent scheduling, goes up indicated resource allocation information according to PDCCH and handles first biography of new HARQ or HARQ re-transmission.
Preferably, go up indicated resource allocation information according to PDCCH and handle that new HARQ is first to be passed or HARQ retransmits and specifically comprises: the base station again the dynamic assignment semi-persistent scheduling pre-configured persistent resource, persistent resource allocation is given former UE or is distributed to other UE; UE handles first biography of HARQ or HARQ re-transmission according to the resource that PDCCH goes up indicated described dynamic assignment again.
Preferably, resource allocation information comprise following one of at least: resource block assignments information, Modulation and Coding Scheme information, HARQ information.
Preferably, go up indicated resource allocation information according to PDCCH and handle first biography of new HARQ and specifically comprise: during the redundancy versions of the transmission block that the UE receiving resource allocation information is indicated, use PDCCH to go up the buffering area of indicated HARQ process.
Preferably, going up indicated resource allocation information according to PDCCH handles first biography of new HARQ and specifically comprise: the HARQ that cancels preceding semi-persistent scheduling opportunity is first to be passed pairing further HARQ and retransmits.
Preferably, going up indicated resource allocation information processing HARQ re-transmission according to PDCCH specifically comprises: when UE handles the first biography of new HARQ according to the upward indicated HARQ process of PDCCH, if the decoding failure is then used PDCCH to go up indicated HARQ process and is handled further HARQ re-transmission.
Preferably, UE does not receive the PDCCH signaling during machine monitoring PDCCH when semi-persistent scheduling, also comprise: UE handles first biography of HARQ of this time semi-persistent scheduling to the indication of HARQ entity new transmission and related HARQ information thereof; In that the HARQ that handles this time semi-persistent scheduling is first when passing, use the HARQ process of reserving, and with the current data in the alternative buffering area of received data; If decoding failure, then further HARQ retransmits the HARQ process of reserving of using, and with the current data in the alternative buffering area of received data.
Dispatching method of the present invention is because adopt dynamic dispatching to cover semi-persistent scheduling, thus overcome prior art scheme complexity height, problem that reliability is low, and then reached simple clear, handle convenient, reliability is high, postpone little effect.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows the schematic diagram of E-UTRAN Radio interface protocols downstream layers 2 structures;
Problem schematic diagram when Fig. 2 shows semi-persistent scheduling HARQ re-transmission with the first related question that passes of HARQ and for HARQ process of semi-persistent scheduling reservation;
Fig. 3 shows existing two the HARQ process solution schematic diagrames of semi-persistent scheduling reservation that are;
Fig. 4 shows the flow chart according to the HARQ dispatching method of the embodiment of the invention;
Fig. 5 shows the schematic diagram of HARQ dispatching method according to the preferred embodiment of the invention;
Fig. 6 shows the flow chart of HARQ dispatching method according to the preferred embodiment of the invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Fig. 4 shows the flow chart according to the HARQ dispatching method of the embodiment of the invention, may further comprise the steps:
Step S10 is for semi-persistent scheduling is reserved at least one HARQ process;
Step S20, a HARQ bust this of a HARQ process in the HARQ process is reserved in UE decoding, and on this HARQ process to there is semi-persistent scheduling opportunity between the opportunity that HARQ retransmits next time;
Step S30 uses dynamic dispatching to replace (Override) semi-persistent scheduling or still uses semi-persistent scheduling and cancel next time that HARQ retransmits.
Described semi-persistent scheduling refers to a subframe or the continuous a plurality of subframes that persistent resource is positioned at opportunity.Described HARQ re-transmission refers to a subframe or the continuous a plurality of subframes that the HARQ retransmission opportunity is positioned at opportunity.Described HARQ transmission refers to that first biography of HARQ or HARQ retransmit.
This dispatching method covers semi-persistent scheduling because of the employing dynamic dispatching when the decoding failure, so overcome the problem that the assorted degree of prior art scheme is high, reliability is low, this HARQ retransmits the first related scheme that passes with HARQ, only need to reserve a HARQ process, compare with the scheme of reserving two HARQ processes, influence for throughput and peak data rate is less, saves Radio Resource; Compare with other schemes of reserving a HARQ process, simply clear, processing makes things convenient for, reliability is high, delay is little.Obviously, the dispatching method of other preferred embodiments of the present invention also supports to reserve two or more HARQ processes.
Preferably, step S10 specifically comprises: the relevant information that will reserve the HARQ process disposes to UE by radio resource control signaling (RRC) or 1/ layer of 2 control channel PDCCH of layer.
Preferably, step S10 specifically comprises: the number of configure reserved HARQ process is a fixed value; Perhaps according to the number of the cycle configure reserved HARQ process of semi-persistent scheduling.
Preferably, the HARQ process of described reservation can dynamically be dispatched shared fully, i.e. dynamic dispatching can be used the HARQ process of described reservation in any subframe, comprise that persistent resource duration of existence and persistent resource are released after.
Preferably, HARQ retransmits the HARQ process of reserving of using next time.
Preferably, the use of HARQ re-transmission next time reservation HARQ process specifically comprises: the available data in the buffering area of the redundancy versions of UE HARQ re-transmission next time and reservation HARQ process is carried out soft merging.
Preferably, step S30 specifically comprises: dynamic dispatching is used and is different from other HARQ processes of reserving the HARQ process; Wherein, if to there being a plurality of semi-persistent scheduling opportunity between the opportunity that HARQ next time retransmits, then use different HARQ processes respectively for the dynamic dispatching on a plurality of semi-persistent scheduling opportunity; Perhaps the HARQ process of reserving is used in dynamic dispatching.
Preferably, to there being a plurality of semi-persistent scheduling opportunity between the opportunity that HARQ next time retransmits, step S30 specifically comprises: dynamic dispatching takes place between opportunity at twice semi-persistent scheduling.
Preferably, step S30 specifically comprises:
The base station uses dynamic dispatching to cover semi-persistent scheduling at semi-persistent scheduling opportunity;
UE thinks that described semi-persistent scheduling opportunity will be by dynamically dispatching office replacement, and machine monitoring PDCCH when semi-persistent scheduling goes up the new HARQ head of indicated resource allocation information processing according to PDCCH and passes or the HARQ re-transmission.
Preferably, go up indicated resource allocation information according to PDCCH and handle that new HARQ is first to be passed or HARQ retransmits and specifically comprises: the base station again the dynamic assignment semi-persistent scheduling pre-configured persistent resource, persistent resource allocation is given former UE or is distributed to other UE.UE handles first biography of HARQ or HARQ re-transmission according to the resource that PDCCH goes up indicated described dynamic assignment again.
Preferably, resource allocation information comprise following one of at least: Resource Block (RB) assignment information, Modulation and Coding Scheme (MCS) information, HARQ information.HARQ information can comprise new HARQ process identification (PID), and this process identification (PID) can be identical or different with the HARQ process identification (PID) of reserving for semi-persistent scheduling.
Preferably, go up indicated resource allocation information according to PDCCH and handle first biography of new HARQ and specifically comprise: during the redundancy versions of the transmission block that the UE receiving resource allocation information is indicated, use PDCCH to go up the buffering area of indicated HARQ process.
Preferably, going up indicated resource allocation information processing HARQ re-transmission according to PDCCH specifically comprises: when UE handles the first biography of new HARQ according to the upward indicated HARQ process of PDCCH, if the decoding failure is then used PDCCH to go up indicated HARQ process and is handled further HARQ re-transmission.
Preferably, UE does not receive the PDCCH signaling during machine monitoring PDCCH when semi-persistent scheduling, also comprise:
UE handles first biography of HARQ of this time semi-persistent scheduling to the indication of HARQ entity new transmission and related HARQ information thereof;
In that the HARQ that handles this time semi-persistent scheduling is first when passing, use the HARQ process of reserving, and with the current data in the alternative buffering area of received data; If decoding failure, then further HARQ retransmits the HARQ process of reserving of using, and with the current data in the alternative buffering area of received data.
Fig. 5 shows the schematic diagram of HARQ dispatching method according to the preferred embodiment of the invention, is described as follows:
Reserve a HARQ process and be used for semi-persistent scheduling, the HARQ process identification (PID) is x.The subframe that persistent resource was positioned at that is used for semi-persistent scheduling is N1, N2, N3, lays respectively in system-frame SFN1, SFN3, the SFN5, is used to carry out the first biography of HARQ.Be located at that the subframe N1 UE of place decoding HARQ is first to pass failure, HARQ retransmits all failures in subframe N1_X1, the UE of N1_X2 place decoding, and the HARQ next time of UE expectation retransmits and is positioned at after the subframe N2, is assumed to receive this time HARQ re-transmission in the position of subframe N1_X3.According to the present invention, UE can not use pre-configured persistent resource to handle that HARQ is first to be passed in subframe N2 position, but subframe N2 place according to PDCCH on indicated HARQ process y handle the first biography of new HARQ.And the HARQ head that uses HARQ process x to handle at subframe N1 in subframe N1_X3 position passes pairing further HARQ re-transmission.HARQ process y decoding HARQ is first to pass failure if UE uses at subframe N2, then UE subframe N2_X1 according to PDCCH on indicated HARQ process y handle at the HARQ of subframe N2 is first and pass pairing HARQ and retransmit.Because first biography of the HARQ of subframe N1 and corresponding HARQ thereof retransmit and all use HARQ process x and corresponding harq buffer district thereof, the HARQ of subframe N2 is first to be passed and corresponding HARQ retransmits that PDCCH goes up indicated new HARQ process y and corresponding harq buffer district thereof when using dynamic dispatching, and the HARQ that therefore crosses over the persistent resource border retransmits N1_X3 does not influence that the HARQ at subframe N2 place is first to be passed and the HARQ re-transmission at subframe N2_X1 place.
Further, if UE does not receive the signaling on the PDCCH at subframe N2 place, then UE with using the HARQ process x that reserves to handle that HARQ is first to be passed, replaces data in current harq buffer district with the transmission block that newly receives according to pre-configured persistent resource.Be equivalent to retransmit N1_X3 at the pairing HARQ of the first biography of the HARQ of subframe N1 and tolled breakdown, the loss of data that causes is recovered by the automatic repeat requests ARQ of wireless chain control layer RLC.
Fig. 6 shows the flow chart of HARQ dispatching method according to the preferred embodiment of the invention, and step is as follows:
Step 110: for semi-persistent scheduling is reserved the HARQ process, the base station is by RRC signaling or the PDCCH notice HARQ process number that UE reserved
Does the desired HARQ of step 120:UE retransmit the subframe that will cross next available persistent resource place? if change step 140; Otherwise change step 130;
Step 130: retransmit under the situation between the subframe at twice available persistent resource place at HARQ, UE uses the HARQ process processing HARQ head that reserves to pass and HARQ retransmits, and changes step 120;
Does step 140: in the subframe that this persistent resource was positioned at, UE monitoring PDCCH channel receive the PDCCH signaling? if change step 160; Otherwise change step 150;
Step 150: use the alternative semi-persistent scheduling of dynamic dispatching for the subframe at this persistent resource place, other HARQ processes of using PDCCH to go up indication are handled the first biography of its HARQ and further HARQ retransmits; Change step 120;
Step 160:UE uses persistent resource to handle the first biography of new HARQ in the HARQ process of reservation, abandons retransmitting for the pairing further HARQ of the first biography of the HARQ of a preceding persistent resource; Change step 120;
As can be seen from the above description, the HARQ that the HARQ dispatching method of the foregoing description proposes retransmits the first related scheme that passes with HARQ, only need to reserve a HARQ process, compare with the scheme of reserving two HARQ processes, influence for throughput and peak data rate is less, saves Radio Resource; Compare with other schemes of reserving a HARQ process, the present invention is simply clear, processing is convenient, reliability is high, delay is little.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. a dispatching method that mixes automatic repeat requests is characterized in that, may further comprise the steps:
For semi-persistent scheduling is reserved at least one hybrid automatic repeat request process;
The automatic repeat requests bust this of mixed once of a hybrid automatic repeat request process in the described reserved hybrid automatic repeat request process of decoding terminals, and have semi-persistent scheduling opportunity between the opportunity that automatic repeat requests retransmits to mix next time on this hybrid automatic repeat request process;
Use dynamic dispatching to replace described semi-persistent scheduling or still use semi-persistent scheduling and cancel and mix automatic repeat requests next time and retransmit.
2. dispatching method according to claim 1 is characterized in that, reserves at least one hybrid automatic repeat request process for semi-persistent scheduling and specifically comprises:
The relevant information of described reserved hybrid automatic repeat request process is disposed to described terminal by radio resource control signaling or Physical Downlink Control Channel.
3. dispatching method according to claim 1 is characterized in that, reserves at least one hybrid automatic repeat request process for semi-persistent scheduling and specifically comprises:
The number that disposes described reserved hybrid automatic repeat request process is a fixed value; Perhaps
Dispose the number of described reserved hybrid automatic repeat request process according to the cycle of semi-persistent scheduling.
4. dispatching method according to claim 1 is characterized in that, reserve at least one hybrid automatic repeat request process for semi-persistent scheduling and specifically comprise: the hybrid automatic repeat request process of described reservation is shared fully by described dynamic dispatching.
5. dispatching method according to claim 1 is characterized in that, the described described reserved hybrid automatic repeat request process of automatic repeat requests re-transmission use of next time mixing.
6. dispatching method according to claim 5 is characterized in that, the described described reserved hybrid automatic repeat request process of automatic repeat requests re-transmission use of next time mixing specifically comprises:
Described terminal is carried out soft merging with the available data in the described buffering area that mixes redundancy versions that automatic repeat requests retransmits and described reserved hybrid automatic repeat request process next time.
7. dispatching method according to claim 1 is characterized in that, uses dynamic dispatching to replace described semi-persistent scheduling specifically to comprise:
Other hybrid automatic repeat request process that are different from described reserved hybrid automatic repeat request process are used in described dynamic dispatching; Wherein, if having a plurality of described semi-persistent scheduling opportunity between the opportunity that automatic repeat requests retransmits, then use different hybrid automatic repeat request process respectively for the dynamic dispatching on described a plurality of semi-persistent scheduling opportunity to mix next time; Perhaps
Described reserved hybrid automatic repeat request process is used in described dynamic dispatching.
8. dispatching method according to claim 1 is characterized in that, has a plurality of described semi-persistent scheduling opportunity between the opportunity that automatic repeat requests retransmits to mix next time, uses dynamic dispatching to replace described semi-persistent scheduling specifically to comprise:
Described dynamic dispatching takes place between opportunity at twice described semi-persistent scheduling.
9. dispatching method according to claim 1 is characterized in that, uses dynamic dispatching to replace described semi-persistent scheduling specifically to comprise:
The base station uses dynamic dispatching to cover described semi-persistent scheduling at described semi-persistent scheduling opportunity;
Terminal is handled the first biography of the automatic repeat requests of new mixing or is mixed automatic repeat requests re-transmission according to resource allocation information indicated on the Physical Downlink Control Channel at described semi-persistent scheduling monitors physical on opportunity down control channel.
10. dispatching method according to claim 9 is characterized in that, handles the first biography of the automatic repeat requests of new mixing or mix automatic repeat requests re-transmission according to resource allocation information indicated on the Physical Downlink Control Channel specifically to comprise:
Described base station again the described semi-persistent scheduling of dynamic assignment pre-configured persistent resource, described persistent resource allocation is given former terminal or is distributed to other-end;
Described terminal is handled to mix the first biography of automatic repeat requests or mix automatic repeat requests according to the resource of described dynamic assignment again indicated on the Physical Downlink Control Channel and is retransmitted.
11. dispatching method according to claim 10 is characterized in that, described resource allocation information comprise following one of at least:
Resource block assignments information, Modulation and Coding Scheme information, hybrid automatic retransmission request information.
12. dispatching method according to claim 9 is characterized in that, handles first biography of the automatic repeat requests of new mixing according to resource allocation information indicated on the Physical Downlink Control Channel and specifically comprises:
When described terminal receives the redundancy versions of the indicated transmission block of described resource allocation information, use the buffering area of hybrid automatic repeat request process indicated on the described Physical Downlink Control Channel.
13. dispatching method according to claim 9 is characterized in that, handles first biography of the automatic repeat requests of new mixing according to resource allocation information indicated on the Physical Downlink Control Channel and specifically comprises:
The first automatic repeat requests of pairing further mixing that passes of the automatic repeat requests of the mixing of cancelling preceding semi-persistent scheduling opportunity retransmits.
14. dispatching method according to claim 9 is characterized in that, handles the automatic repeat requests re-transmission of mixing according to resource allocation information indicated on the Physical Downlink Control Channel and specifically comprises:
When described terminal is handled the first biography of the automatic repeat requests of described new mixing according to hybrid automatic repeat request process indicated on the described Physical Downlink Control Channel, if the decoding failure, the automatic repeat requests of mixing retransmits then to use hybrid automatic repeat request process indicated on the described Physical Downlink Control Channel to handle further.
15. dispatching method according to claim 9 is characterized in that, terminal does not receive the Physical Downlink Control Channel signaling when described semi-persistent scheduling monitors physical on opportunity down control channel, also comprise:
Described terminal is handled first biography of the automatic repeat requests of mixing of this time semi-persistent scheduling to mixing automatic repeat requests entity indication new transmission and related hybrid automatic retransmission request information thereof;
In that the automatic repeat requests of the mixing of handling this time semi-persistent scheduling is first when passing, use described reserved hybrid automatic repeat request process, and with the current data in the alternative buffering area of received data; If decoding failure then further mixes automatic repeat requests and retransmits the described reserved hybrid automatic repeat request process of using, and with the current data in the alternative buffering area of received data.
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