CN101667900B - Method for feeding back HARQ - Google Patents
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- CN101667900B CN101667900B CN200810212534.5A CN200810212534A CN101667900B CN 101667900 B CN101667900 B CN 101667900B CN 200810212534 A CN200810212534 A CN 200810212534A CN 101667900 B CN101667900 B CN 101667900B
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Abstract
The invention discloses a method for feeding back HARQ, which comprises that: a sending end sends data to one or more receiving ends; a feedback mode of the receiving ends for feedback information of the data and/or parameters related to the feedback mode are determined according to channel characteristics, and are notified to the receiving ends. By means of the technical scheme, the feedback mode of the data is determined through the channel characteristics to reduce resources occupied by feedback channels and improve feedback efficiency and spectral efficiency of a wireless communication system.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of HARQ feedback method.
Background technology
In wireless communication system, base station is the equipment of service that provides for terminal, base station communicates by Uplink/Downlink and terminal, and descending is that relay station/terminal, relay station are arrived to the direction of terminal in base station, and up is that terminal to base station/relay station, relay station are to the direction of base station.
Adopting base station to realize in the wireless communication system of wireless resource scheduling control, the dispatching distribution of system wireless resource is completed by base station.When the dispatching distribution of Radio Resource is carried out in base station in severe wireless environment, may there is the failed situation of decoding in communications reception node, can cause like this decline of this bust this and efficiency of transmission.
At present, mainly adopt autonomous retransmission (Automatic Repeat Request, referred to as ARQ) technology and forward error correction coding (Front Error Code, referred to as FEC) technology to resist the decline of channel.For example, in following wireless communication system (3G and B3G system), adopt mixed automatic retransfer technology (Hybrid Automatic Repeat Request, referred to as HARQ) ensure the reliability of communication, and raising efficiency of transmission, this HARQ technology combines the advantage of FEC technology and ARQ technology.For example, in IEEE802.16e, HARQ has two kinds of patterns: catch up with merging (Chase Combing, referred to as CC) pattern and steadily increase redundancy (Incremental Redundancy, referred to as IR) pattern.
In the communication process of communication sending node and communications reception node, communication sending node sends the first data burst (Burst) that passes to communications reception node, in the situation that communications reception node does not correctly receive this Burst, can retain cannot correct decoding Burst, and to communication sending node send cannot correctly receive reply indication (as NACK), communication sending node receives this and replys after indication, can retransmit this Burst to communications reception node, communications reception node merges decoding by the Burst of re-transmission and the Burst that receives before this, wherein, under CC pattern, retransmit Burst identical with the first Burst of biography, but under IR pattern, retransmit Burst different from the first Burst of biography.
The response feedback of HARQ technology needs very sane transmission means, at HARQ, connects more and number of retransmissions when more, and the feedback information of HARQ (as ACK or NACK) can take a large amount of bandwidth conventionally.For example, in the up link of IEEE802.16e, every 2 ack channels will occupy 72 subcarriers, at Long Term Evolution (Long TermEvolution, referred to as LTE) in the up link of system, every 18 HARQ feedback channels will occupy 168 subcarriers.In order to reduce the feedback of ACK, IEEE802.16e and LTE system are that each HARQ Burst distributes a HARQ feedback channel, but for a Burst (as 24000 bits) that data volume is very large, in order to mate with the code length of encoder, physical layer needs this Burst to split into several independently encoding block (CodingBlock, referred to as CB) transmit, in transmitting procedure, as long as having 1 encoding block makes mistakes, whole Burst needs to retransmit, transmitting correct encoding block also needs to retransmit, can find out, although carry out HARQ feedback according to Burst, saved the resource that feedback channel takies, but a lot of unnecessary re-transmissions have also been produced.
Summary of the invention
Consider in correlation technique, exist in data transmission procedure, as long as there is 1 encoding block to make mistakes, whole data all need the problem retransmitting and propose the present invention, for this reason, main purpose of the present invention is to provide a kind of HARQ feedback method, to address the above problem.
According to an aspect of the present invention, provide a kind of HARQ feedback method.
HARQ feedback method according to the present invention comprises: transmitting terminal sends data to one or more receiving terminals, determines that receiving terminal is to the feedback system of the feedback information of data and/or the parameter relevant to feedback system, and notify receiving terminal according to the characteristic of channel.
Wherein, above-mentioned data refer to the data that physical layer is to be sent.
Wherein, the above-mentioned characteristic of channel comprises one of following or combination: the whether restricted or limited degree of upstream bandwidth, whether ascending power is restricted or limited degree, whether downlink bandwidth is restricted or limited degree, whether descending power is restricted or limited degree.
Wherein, it is one of following that above-mentioned feedback system comprises: implicit expression HARQ feedback, and when correct to data receiver, carry out HARQ feedback or carry out HARQ feedback during to data receiver mistake; Explicit HARQ feedback, all carries out HARQ feedback when correct to data receiver and when mistake receives; Feedback system one by one, transmitting terminal is divided into one or more encoding blocks by data, and receiving terminal feeds back each encoding block one by one; Grouping feedback system, transmitting terminal is divided into a plurality of encoding blocks by data, and a plurality of encoding blocks are divided into one or more encoding block groups, and receiving terminal feeds back each encoding block group.
Wherein, the operation that a plurality of encoding blocks is divided into a plurality of encoding block groups is specially: according to the characteristic of channel and/or channel condition, a plurality of encoding blocks are divided into a plurality of encoding block groups, the number of the encoding block in each encoding block group equates or be unequal; Wherein, the number of the quality of the characteristic of channel and encoding block group is inversely proportional to, or the number of the speed of changes in channel conditions and encoding block group is inversely proportional to.
Wherein, above-mentioned each encoding block group has independently HARQ feedback channel.
Wherein, the above-mentioned parameter relevant to feedback system comprises one of following or combination: the packet parameters of the CRC length of data, grouping feedback system, wherein, packet parameters comprises the encoding block number of quantity and/or each encoding block group of encoding block group.
Further, the method also comprises: set in advance the corresponding relation between the length range of data and CRC that data need to be added; Transmitting terminal is according to the length of data, the length of the CRC that specified data is corresponding; Receiving terminal receives data, obtains CRC corresponding to data, and judges that according to CRC whether the reception of data is correct.
Wherein, receiving terminal judges that according to CRC the whether correct operation of reception of data is specially: receiving terminal is according to receiving data, according to the length of CRC corresponding to corresponding relation specified data; After the data that receive are removed to CRC, recalculate CRC, if the CRC recalculating is identical with the CRC receiving, the data that judgement receives are correct, otherwise, the error in data that judgement receives.
Wherein, transmitting terminal is according to the length of data, the operation of the length of the CRC that specified data is corresponding is specially: during the length of the first draft code block that the length of data is less than or equal to that HARQ allows, transmitting terminal is according to the length of data or for transmitting the length of the encoding block of data, the CRC that specified data is corresponding; Otherwise, data being divided into a plurality of encoding blocks and transmitting, feedback system is one by one during feedback system, and each encoding block is corresponding the longest CRC all, and when feedback system is packet mode, each encoding block group is corresponding the longest CRC all.
The length of the first draft code block that wherein, HARQ allows is determined one of in the following manner: the value of the length of the first draft code block that arranges that HARQ allows; Or, the length of the first draft code block of dynamically determining according to the speed of the characteristic of channel or changes in channel conditions that HARQ allows, wherein, the number of the quality of the characteristic of channel and encoding block group is inversely proportional to, and the speed of changes in channel conditions and HARQ allow the length of maximum encoding block to be inversely proportional to.
Wherein, the above-mentioned characteristic of channel comprise following one of at least or combination: the whether restricted or limited degree of upstream bandwidth, whether ascending power restricted or limited degree, whether downlink bandwidth restricted or limited degree, whether descending power restricted or limited degree.
Wherein, above-mentioned channel condition comprises long term channel and/or the short-term channel quality of the resource that encoding block is occupied.
Wherein, above-mentioned notice receiving terminal comprises: transmitting terminal is by control channel or administrative messag and notify one or more receiving terminal feedback systems and/or the parameter relevant to feedback system prior to resource allocation message; Or transmitting terminal is by carrying each receiving terminal feedback system and/or the parameter relevant to feedback system in the resource allocation message sending to one or more receiving terminals.
Wherein, above-mentioned transmitting terminal refers to base station, relay station, terminal, and receiving terminal refers to base station, relay station, terminal.
According to an aspect of the present invention, provide a kind of HARQ feedback method.
HARQ feedback method according to the present invention comprises: transmitting terminal is according to the length of data, the length of the CRC that specified data is corresponding; Receiving terminal receives data, obtains CRC corresponding to data, and judges that according to CRC whether the reception of data is correct.
Wherein, above-mentioned data refer to the data that physical layer is to be sent.
Further, the method also comprises: set in advance the corresponding relation between the length range of data and CRC that data need to be added.
Wherein, above-mentioned corresponding relation is that transmitting terminal is arranged the length of a plurality of encoding blocks of HARQ permission according to order from small to large, and the length of a plurality of encoding blocks is divided into a plurality of encoding block groups according to order from small to large, the CRC of the equal corresponding preset length of a plurality of encoding blocks in each encoding block group, accordingly, transmitting terminal is selected the length of encoding block and selects corresponding CRC according to the length of data; Or, corresponding relation is that transmitting terminal is arranged the length of a plurality of encoding blocks of HARQ permission according to order from big to small, and the length of a plurality of encoding blocks is divided into a plurality of encoding block groups according to order from big to small, the CRC of the equal corresponding preset length of a plurality of encoding blocks in each encoding block group, accordingly, transmitting terminal is selected the length of encoding block and selects corresponding CRC according to the length of data.
Wherein, the encoding block length that HARQ allows is determined one of in the following manner: the value that the encoding block length that HARQ allows is set; Or, the length of the first draft code block of dynamically determining according to the speed of the characteristic of channel or changes in channel conditions that HARQ allows, wherein, the number of the quality of the characteristic of channel and encoding block group is inversely proportional to, and the speed of changes in channel conditions and HARQ allow the length of maximum encoding block to be inversely proportional to.
Wherein, receiving terminal judges that according to CRC the whether correct operation of reception of data is specially: receiving terminal is according to receiving data, according to the length of CRC corresponding to corresponding relation specified data; After the data that receive are removed to CRC, recalculate CRC, if the CRC recalculating is identical with the CRC receiving, the data that judgement receives are correct, otherwise, the error in data that judgement receives.
Wherein, transmitting terminal is according to the length of data, the operation of the length of the CRC that specified data is corresponding is specially: during the length of the first draft code block that the length of data is less than or equal to that HARQ allows, transmitting terminal is according to the length of data or for transmitting the length of the encoding block of data, the length of the CRC that specified data is corresponding; Otherwise, data being divided into a plurality of encoding blocks and transmitting, feedback system is one by one during feedback system, each encoding block is the longest CRC of correspondence all, when feedback system is packet mode, a plurality of encoding blocks are divided into one or more encoding block groups, each encoding block group is the longest CRC of correspondence all.
Wherein, above-mentioned transmitting terminal refers to base station, relay station, terminal, and receiving terminal refers to base station, relay station, terminal.
According to an aspect of the present invention, provide a kind of HARQ feedback method.
HARQ feedback method according to the present invention comprises: transmitting terminal sends data to one or more receiving terminals, during the length of the first draft code block that data are greater than that HARQ allows, transmitting terminal is divided into a plurality of encoding blocks by data, and a plurality of encoding blocks are divided into one or more encoding block groups, wherein, the number of the encoding block in each the encoding block group in a plurality of encoding block groups equates or is unequal; Receiving terminal feeds back each encoding block group.
Wherein, above-mentioned data refer to the data that physical layer is to be sent.
Further, before transmitting terminal sends data to one or more receiving terminals, the method also comprises: transmitting terminal sends to receiving terminal by packet parameters, and wherein, packet parameters comprises the number of the quantity of encoding block group and/or the encoding block of each encoding block group.
Wherein, above-mentioned transmitting terminal refers to base station, relay station, terminal, and receiving terminal refers to base station, relay station, terminal.
According to an aspect of the present invention, provide a kind of HARQ feedback method.
HARQ feedback method according to the present invention comprises: transmitting terminal sends data to one or more receiving terminals, during the length of the first draft code block that data are greater than that HARQ allows, transmitting terminal is divided into data a plurality of encoding blocks in advance, a plurality of encoding blocks are divided into one or more encoding block groups, and the number of encoding block during a plurality of encoding block group in each encoding block group equates or is unequal, wherein, according to the characteristic of channel and/or channel condition, determine the number of the number of encoding block group and the encoding block of encoding block group; Receiving terminal feeds back each encoding block group.
Wherein, above-mentioned data refer to the data that physical layer is to be sent.
Further, the method also comprises: for each encoding block group arranges independently HARQ feedback channel.
Wherein, according to the characteristic of channel and/or channel condition, determine that the method for the number of the number of encoding block group and the encoding block of encoding block group is to preset or dynamically specify.
Wherein, according to the characteristic of channel and/or channel condition, determine that the operation of the number of encoding block group comprises: the number of the quality of the characteristic of channel and encoding block group is inversely proportional to; Or the number of the speed of changes in channel conditions and encoding block group is inversely proportional to.
Wherein, the above-mentioned characteristic of channel comprise following one of at least or combination: the whether restricted or limited degree of upstream bandwidth, whether ascending power restricted or limited degree, whether downlink bandwidth restricted or limited degree, whether descending power restricted or limited degree.
Wherein, above-mentioned channel condition comprises long term channel and/or the short-term channel quality of the resource that encoding block is occupied.
Wherein, above-mentioned transmitting terminal refers to base station, relay station, terminal, and receiving terminal refers to base station, relay station, terminal.
By above-mentioned at least one technical scheme of the present invention, by carry out the feedback system of specified data according to the characteristic of channel, reduced the resource that feedback channel occupies, improved the spectrum efficiency of feedback efficiency and wireless communication system.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, for explaining the present invention, is not construed as limiting the invention together with embodiments of the present invention.In the accompanying drawings:
Fig. 1 (a) adjusts the process schematic diagram of the HARQ feedback system of terminal according to the base station of the example one of the inventive method embodiment;
Fig. 1 (b) adjusts the process schematic diagram of the HARQ feedback system of terminal according to the base station of the example one of the inventive method embodiment;
Fig. 2 (a) carries out the process schematic diagram of HARQ feedback according to the HARQ indication information of base station according to the terminal of the example one of the inventive method embodiment;
Fig. 2 (b) carries out the process schematic diagram of HARQ feedback according to the HARQ indication information of base station according to the terminal of the example one of the inventive method embodiment;
Fig. 3 (a) carries out the process schematic diagram of HARQ feedback according to the HARQ indication information of base station according to the terminal of the example two of the embodiment of the present invention;
Fig. 3 (b) is according to the schematic diagram of the CRC check method of the example two of the embodiment of the present invention;
Fig. 4 (a) is according to carry out the method schematic diagram of HARQ feedback in the HARQ transmitting procedure of the example three of the embodiment of the present invention by group;
Fig. 4 (b) is according to carry out the method schematic diagram of HARQ feedback in the HARQ transmitting procedure of the example three of the embodiment of the present invention by group;
Fig. 5 (a) is according to the group technology schematic diagram in the HARQ transmitting procedure of the example four of the embodiment of the present invention;
Fig. 5 (b) is according to the group technology schematic diagram in the HARQ transmitting procedure of the example four of the embodiment of the present invention;
Fig. 5 (c) is according to the group technology schematic diagram in the HARQ transmitting procedure of the example four of the embodiment of the present invention;
Fig. 5 (d) is according to the group technology schematic diagram in the HARQ transmitting procedure of the example four of the embodiment of the present invention;
Fig. 5 (e) is according to the group technology schematic diagram in the HARQ transmitting procedure of the example four of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, describe the present invention in detail.
Embodiment of the method
According to the embodiment of the present invention, provide a kind of HARQ feedback method.
According to the HARQ feedback method of the embodiment of the present invention, comprise: transmitting terminal sends data to one or more receiving terminals, according to the characteristic of channel, determine that receiving terminal is to the feedback system of the feedback information of data and/or the parameter relevant to feedback system, and notify receiving terminal, wherein, above-mentioned data refer to the data that physical layer is to be sent.
The technical scheme providing by the embodiment of the present invention, by carry out the feedback system of specified data according to the characteristic of channel, has reduced the resource that feedback channel occupies, and has improved the spectrum efficiency of feedback efficiency and wireless communication system.
Wherein, the above-mentioned characteristic of channel comprises one of following or combination: the whether restricted or limited degree of upstream bandwidth, whether ascending power is restricted or limited degree, whether downlink bandwidth is restricted or limited degree, whether descending power is restricted or limited degree.Correspondingly, it is one of following that feedback system comprises: implicit expression HARQ feedback, and when correct to data receiver, carry out HARQ feedback, carry out HARQ feedback during to data receiver mistake; Explicit HARQ feedback, whether data correctly receive, and all these data are carried out to HARQ feedback; Feedback system one by one, transmitting terminal is divided into data one or more encoding blocks in advance, and receiving terminal feeds back each encoding block one by one; Grouping feedback system, transmitting terminal is divided into data a plurality of encoding blocks in advance, and a plurality of encoding blocks are divided into one or more encoding block groups, and receiving terminal feeds back each encoding block group; The parameter relevant to feedback system comprises one of following or combination: the packet parameters of the CRC length of data, grouping feedback system, wherein, packet parameters comprises the encoding block number of quantity and/or each encoding block group of encoding block group.
In specific implementation process, the operation that a plurality of encoding blocks is divided into a plurality of encoding block groups is specially: can a plurality of encoding blocks be divided into a plurality of encoding block groups according to the characteristic of channel and/or channel condition, in each encoding block group, the number of encoding block is independently determined, the number that is the encoding block in each encoding block group is equal or unequal, and each encoding block group has independently feedback channel, wherein, the number of the quality of the characteristic of channel and encoding block group is inversely proportional to, or the number of the pace of change of channel condition and encoding block group is inversely proportional to.
Transmitting terminal refers to base station, relay station, terminal, and receiving terminal refers to base station, relay station, terminal.
In addition, the embodiment of the present invention provides a kind of CRC of utilization to receiving data, to carry out the method for verification, below the method is described.
First, set in advance the corresponding relation between the length range of data and CRC that data need to add, then, transmitting terminal is according to the length of data, and the CRC that specified data is corresponding is last, receiving terminal receives data, obtains CRC corresponding to data, and judges that according to CRC whether the reception of data is correct.
Particularly, during the length of the first draft code block that the length of data is less than or equal to that HARQ allows, transmitting terminal is according to the length of data or for transmitting the length of the encoding block of data, the CRC that specified data is corresponding; Otherwise, data being divided into a plurality of encoding blocks and transmitting, feedback system is one by one during feedback system, and each encoding block is corresponding the longest CRC check all, and when feedback system is packet mode, each encoding block group is corresponding the longest CRC check all.
Receiving terminal is according to receiving data, and the CRC length corresponding according to corresponding relation specified data recalculates CRC after the data that receive are removed to CRC, if the CRC recalculating is identical with the CRC receiving, the data that judgement receives are correct, otherwise, the error in data that judgement receives.
The length of the first draft code block that wherein, HARQ allows is determined one of in the following manner: the value of the length of the first draft code block that arranges that HARQ allows; Or, the length of the first draft code block of determining according to the speed of changes in channel conditions that HARQ allows, wherein, the number of the quality of the characteristic of channel and described encoding block group is inversely proportional to, the speed of changes in channel conditions and HARQ allow the length of maximum encoding block to be inversely proportional to.
Example one
Fig. 1 a and Fig. 1 b show the schematic diagram that the HARQ feedback method of terminal is adjusted in base station, and Fig. 2 a and Fig. 2 b show terminal and according to the HARQ feedback method of base station, carry out the schematic diagram of HARQ feedback.
As Fig. 1 a, base station sends before data in the terminal to supporting HARQ, first to terminal, sends HARQ feedback method Indication message 1, and this Indication message 1 indicating terminal adopts explicit HARQ feedback, and HARQ encoding block is fed back one by one.Then, base station sends HARQ resource allocation message and HARQ encoding block to terminal, and terminal is according to HARQ resource allocation message decoding HARQ encoding block, and according to the method for indication in Indication message 1, whether HARQ encoding block is correctly received and fed back.
As shown in Figure 2 a, the encoding block length that HARQ allows is 4800 bits, the data burst that this Padding crosses is divided into 4 parts, every part forms 4800 bits after adding the CRC of 16 bits, after the HARQ encoder of 1/2 code check by encoding block 1, encoding block 2, encoding block 3 and encoding block 4 send to terminal, terminal shows HARQ feedback one by one to each encoding block, wherein, encoding block 1, encoding block 2 and encoding block 3 are correctly decoded, terminal is to base station feedback ACK, encoding block 4HARQ encoding block is made mistakes, terminal feedback is NACK, base station is according to the feedback of terminal, retransmit the 4th HARQ encoding block, terminal receives the encoding block 4 retransmitting, be correctly decoded and feeding back ACK, so far, whole data burst transmission finishes, visible this transmitting procedure only needs 4 HARQ feedback channels.
Judgement up being subject in base station, can be reduced the quantity of HARQ uplink feedback channel in limited time.Base station sends HARQ feedback method Indication message 2 to terminal, and these Indication message 2 indicating terminals adopt explicit HARQ feedback and HARQ encoding block is divided into groups to feed back.As shown in Figure 2 b, this data burst is divided into 3 groups after Padding again, after adding respectively the CRC of 16 bits, form 4800 bits, the group of 9600 bits and 4800 bits, HARQ feedback is carried out for group, 9600 bits are split as to 2 4800 bits, thereby meet the code length that 4 HARQ allow.After the HARQ encoder of 1/2 code rate, encoding block group 1, encoding block group 2 and encoding block group 3 are sent to terminal, terminal is carried out HARQ feedback to each encoding block group, wherein, encoding block group 1 and encoding block group 2 are correctly decoded, terminal is to base station feedback ACK, the HARQ decode encoded blocks mistake of encoding block group 3, terminal feedback is NACK, base station is according to the feedback of terminal, retransmit the HARQ encoding block of encoding block group 3, terminal is correctly decoded and feeding back ACK, so far, whole data burst transmission finishes, and this transmitting procedure only needs 3 HARQ feedback channels as seen.
In the situation that the characteristic of channel changes, base station can be adjusted the feedback system of terminal neatly, as shown in Figure 1 b, base station sends before data in the terminal to supporting HARQ, first to terminal, send HARQ resource allocation message 1, in resource allocation message 1, comprise HARQ feedback method indication information, this indication information 1 indicating terminal adopts explicit HARQ feedback, and HARQ encoding block is fed back one by one.Up being subject in limited time judged in base station, and base station sends HARQ resource allocation message 2 to terminal, comprises HARQ feedback method indication information in resource allocation message 2, and these indication information 2 indicating terminals adopt explicit HARQ feedback, and HARQ encoding block is divided into groups to feed back.
In addition, the embodiment of the present invention also provides a kind of receiving terminal according to CRC, to judge the whether correct method of data of its reception, below by implementing two pairs of the method, is elaborated.
Example two
Set in advance the length range of data burst and the corresponding relation between CRC length, and described corresponding relation is notified to described transmitting terminal and described receiving terminal, particularly, list the set that the length of the encoding block that HARQ allows is arranged from small to large: { 48,96,144,192,288,384,480,960,1920,2880,3840,4800}, and 12 kinds of HARQ encoding block length in set are divided into 3 groups.For example, three groups that are divided into are respectively { 48,96,144,192}, { 288,384,480,960} and { 1920,2880,3840,4800}, wherein, { the CRC length of 48,96,144,192} is CRC-8, { the CRC length of 288,384,480,960} is CRC-12, { the CRC length of 1920,2880,3840,4800} is CRC-16.Accordingly, by { 48,96,144, data burst length (can comprise Padding) corresponding to CRC that 192} removes 8 bits is { 40,88,136,184}, by { data burst length (can comprise Padding) corresponding to CRC that 288,384,480,960} removes 12 bits is { 276,372,468,948}, by { 1920, data burst length (can comprise Padding) corresponding to CRC that 2880,3840,4800} removes 16 bits is { 1904,2864,3824,4784}.
As Fig. 3 shows the schematic diagram of CRC check method, as shown in Figure 3, a data burst length is 132 bits, only need the HARQ coded block transmission that a length is 144 bits, and data burst corresponding to the HARQ encoding block of 144 bits is 136 bits, needs Padding4 bit to become 136 bits, then add CRC-8, become 144 bits, and the data burst of this 144 bit is become to 192 bits through the HARQ coding of 3/4 code rate send.
It should be noted that, the data burst splitting for needs, as the encoding block in Fig. 2, all selects the CRC-16 that length is the longest.
Example three
Fig. 4 a and Fig. 4 b show respectively the method schematic diagram in HARQ transmitting procedure, data burst being divided into groups.
As shown in Fig. 4 a, a data burst length through Padding is 23920 bits, the maximum length of the data burst allowing due to HARQ is 4800 bits, therefore just this data burst is divided into 5 groups and transmits, each encoding block group comprises 4784 bits, add respectively the CRC of 16 bits, become 4800 bits, HARQ coding through 1/2 code rate forms 5 HARQ encoding blocks that length is 9600 bits, each encoding block group comprises a HARQ encoding block, the data burst in each encoding block group equal in length.
As shown in Figure 4 b, the data burst length through Padding is 23920 bits, because the maximum length of the data burst that HARQ allows is 4800 bits, simultaneously in order to reduce the expense of HARQ feedback channel, adopts 2 groups to carry out HARQ feedback.First, data burst is carried out again to Padding, and to obtain data burst be 23968 bits, be divided into 9584 bits and the unequal encoding block group of 2 sizes of 14384 bits, these two encoding block groups are added respectively after the CRC of 16 bits, become 9600 bits and 14400 bits; Again 9600 bits are split to 2 4800 bits, 14400 bits split 3 4800 bits, be divided into into 5 4800 bits, the HARQ coding that the data of 5 4800 bits is carried out to 1/2 code rate forms 5 HARQ encoding blocks, wherein, encoding block 1 and encoding block 2 form encoding block group 1, and this encoding block group is carried out to CRC check, encoding block 3, encoding block 4 and encoding block 5 form encoding block group 2, and this encoding block group is carried out to CRC check.
Example four
Fig. 5 a, Fig. 5 b, Fig. 5 c, Fig. 5 d and Fig. 5 e show respectively the schematic diagram of the group technology in HARQ transmitting procedure.
As shown in Figure 5 a, a data burst length through Padding is 28704 bits, the maximum length of the data burst allowing due to HARQ is 4800 bits, at upstream bandwidth, be not subject in limited time in order to improve descending efficiency of transmission, this data burst can be divided into 6 encoding block groups transmits, wherein, the data that each encoding block group comprises 4784 bits, add respectively the CRC of 16 bits, become 4800 bits, HARQ coding through 1/2 code rate forms 6 HARQ encoding blocks, each group comprises a HARQ encoding block, the equal and opposite in direction of 6 encoding block groups, like this, need 6 HARQ feedback channels.
As shown in Figure 5 b, upstream bandwidth is subject in limited time, in order to reduce the quantity of ascending HARQ feedback and the expense of reduction HARQ feedback channel, one is 23936 bits through the data burst length of Padding again, first data burst is divided into 4784 bits, 9584 bits, 4784 bits and 4 encoding block groups of 9584 bits, add respectively the CRC of 16 bits, become 4800 bits, 9600 bits, 4800 bits and 9600 bits, again 9600 bits are split to 2 4800 bits, form altogether 6 4800 bits, like this data of 6 4800 bits are carried out 6 HARQ encoding blocks of HARQ coding formation of 1/2 code rate, wherein, encoding block 1 forms encoding block group 1, encoding block 2 and encoding block 3 form encoding block group 2, encoding block 4 forms encoding block group 3, encoding block and encoding block 6 form encoding block group 4, every group of CRC check independently.Like this this data burst is divided into 4 groups and transmits, for each encoding block group, carry out HARQ feedback, now need 4 HARQ feedback channels.
As shown in Figure 5 c, when upstream bandwidth is still subject in limited time, the quantity of ascending HARQ feedback is continued to reduce in base station, one is 23952 bits through the data burst length of Padding again, in order to reduce the expense of HARQ feedback channel, this data burst can be divided into 3 groups and transmit, for 3 groups, carry out HARQ feedback.First, data burst is divided into 9584 bits, 14384 bits, 4784 3 of bits parts, add respectively the CRC of 16 bits, become 9600 bits, 14400 bits and 4800 bits, again 9600 bits are split to 2 4800 bits, 14400 bits are split as 3 4800 bits, form altogether 6 4800 bits, the HARQ coding that the data of 6 4800 bits is carried out to 1/2 code rate forms 6 HARQ encoding blocks, wherein, encoding block 1, encoding block 2 and encoding block 3 form encoding block group 1, encoding block 4, encoding block 5 forms encoding block group 2, encoding block 6 forms encoding block group 3, each encoding block group has independently CRC check, now need 3 HARQ feedback channels.
As shown in Fig. 5 d, when upstream bandwidth is still subject in limited time, the quantity of ascending HARQ feedback is continued to reduce in base station.One is 23968 bits through the data burst length of Padding again, in order to reduce the expense of HARQ feedback channel, this data burst is divided into 2 groups and transmits, and adopts 2 groups to carry out HARQ feedback.First, data burst is divided into 14384 bits, 14,384 2 of bits parts, add respectively the CRC of 16 bits, become 14400 bits and 14400 bits; Because the maximum length of the data that HARQ coding allows is 4800 bits, again 14400 bits are split to 3 4800 bits, 14400 bits are split as 3 4800 bits, form altogether 6 4800 bits, the data of 6 4800 bits are carried out to HARQ coding and form 6 HARQ encoding blocks, wherein, encoding block 1, encoding block 2 and encoding block 3 form encoding block group 1, encoding block 4, encoding block 5 and encoding block 6 form encoding block group 2, each encoding block group has independently CRC check, now needs 2 HARQ feedback channels.
As shown in Fig. 5 e, when upstream bandwidth is still subject in limited time, the quantity of ascending HARQ feedback is continued to reduce in base station.One is 23984 bits through the data burst length of Padding again, in order to reduce the expense of HARQ feedback channel, this data burst is divided into 1 group and transmits, and for group, carries out HARQ feedback.First, data burst is added to the CRC of 16 bits, become 24000 bits; Because the maximum length of the data that HARQ coding allows is 4800 bits, again 24000 bits are split to 6 4800 bits, the data of 6 4800 bits are carried out to HARQ coding and form 6 HARQ encoding blocks, wherein, encoding block 1, encoding block 2, encoding block 3, encoding block 4, encoding block 5 and encoding block 6 form encoding block group 1, this data burst has 1 CRC check, now needs 1 HARQ feedback channel.
According to the embodiment of the present invention, provide a kind of HARQ feedback method.
According to the HARQ feedback method of the embodiment of the present invention, comprise: according to transmitting terminal according to the length of data, the length of the CRC that specified data is corresponding; Receiving terminal receives data, obtains CRC corresponding to data, and judges that according to the length of CRC whether the reception of data is correct, and wherein, above-mentioned data refer to the data that physical layer is to be sent.
Further, the method also comprises: set in advance the corresponding relation between the length range of data and CRC that data need to be added, and corresponding relation is notified to transmitting terminal and receiving terminal.
Below to the length range of data being set and two kinds of modes of the corresponding relation between CRC length describe.
Mode one: the length of a plurality of encoding blocks that transmitting terminal allows HARQ is arranged according to order from small to large, and the length of a plurality of encoding blocks is divided into a plurality of encoding block groups according to order from small to large, the CRC of the equal corresponding preset length of a plurality of encoding blocks in each encoding block group, accordingly, transmitting terminal is selected the length of encoding block and selects corresponding CRC according to the length of described data; Or,
Mode two: the length of a plurality of encoding blocks that transmitting terminal allows HARQ is arranged according to order from big to small, and the length of a plurality of encoding blocks is divided into a plurality of encoding block groups according to order from big to small, the CRC of the equal corresponding preset length of a plurality of encoding blocks in each encoding block group, accordingly, transmitting terminal is selected the length of encoding block and selects corresponding CRC according to the length of data.
Wherein, the encoding block length that HARQ allows one of can be in the following manner determined: the value that the encoding block length that HARQ allows is set; Or, the length of the first draft code block of dynamically determining according to the speed of the characteristic of channel or changes in channel conditions that HARQ allows, wherein, the number of the quality of the characteristic of channel and encoding block group is inversely proportional to, and the speed of changes in channel conditions and HARQ allow the length of maximum encoding block to be inversely proportional to.
Transmitting terminal is according to the length of data, the operation of the CRC that specified data is corresponding is specially: during the length of the first draft code block that the length of data is less than or equal to that HARQ allows, transmitting terminal is according to the length of data or for transmitting the length of the encoding block of data, the CRC that specified data is corresponding; Otherwise, data being divided into a plurality of encoding blocks and transmitting, feedback system is one by one during feedback system, and each encoding block is corresponding the longest CRC check all, and when feedback system is packet mode, each encoding block group is corresponding the longest CRC check all.
In addition, particularly, receiving terminal is according to the data that receive, the CRC length corresponding according to corresponding relation specified data; After the data that receive are removed to CRC, recalculate CRC, if the CRC recalculating is identical with the CRC receiving, the data that judgement receives are correct, otherwise, the error in data that judgement receives.
According to the embodiment of the present invention, provide a kind of HARQ feedback method.
According to the HARQ feedback method of the embodiment of the present invention, comprise: transmitting terminal sends data to one or more receiving terminals, during the length of the first draft code block that data are greater than that HARQ allows, transmitting terminal is divided into data a plurality of encoding blocks in advance, and a plurality of encoding blocks are divided into a plurality of encoding block groups, wherein, the number of the encoding block in each encoding block group equates or is unequal; Receiving terminal feeds back each encoding block group.
In addition, before transmitting terminal sends data to one or more receiving terminals, method also comprises: transmitting terminal sends to receiving terminal by packet parameters, and wherein, packet parameters comprises the encoding block number of quantity and/or each encoding block group of encoding block group.
According to the embodiment of the present invention, provide a kind of HARQ feedback method.
According to the HARQ feedback method of the embodiment of the present invention, comprise: transmitting terminal sends data to one or more receiving terminals, during the length of the first draft code block that data are greater than that HARQ allows, transmitting terminal is divided into data a plurality of encoding blocks in advance, a plurality of encoding blocks are divided into one or more encoding block groups, and during a plurality of encoding block group, the number of the encoding block in each encoding block group equates or is unequal, wherein, according to the characteristic of channel and/or channel condition, determine the number of the number of encoding block group and the encoding block of encoding block group; Receiving terminal feeds back each encoding block group, and for each encoding block group, independently HARQ feedback channel is set, and wherein, above-mentioned data refer to the data that physical layer is to be sent.
In addition, according to the characteristic of channel and/or channel condition, determine that the operation of the number of encoding block group is specially: the number of the quality of the characteristic of channel and encoding block group is inversely proportional to; Or the number of the speed of changes in channel conditions and encoding block group is inversely proportional to.
Particularly, can determine that the method for the number of the number of described encoding block group and the encoding block of encoding block group is to preset or dynamically specify according to the characteristic of channel and/or channel condition.
Wherein, the characteristic of channel comprise following one of at least or combination: the whether restricted or limited degree of upstream bandwidth, whether ascending power restricted or limited degree, whether downlink bandwidth restricted or limited degree, whether descending power restricted or limited degree, and channel condition comprises long term channel and/or the short-term channel quality of the resource that encoding block is occupied.
As mentioned above, by means of HARQ feedback method provided by the invention, by carry out the feedback system of specified data according to the characteristic of channel, reduce the resource that feedback channel occupies, improved the spectrum efficiency of feedback efficiency and wireless communication system.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (17)
1. a HARQ feedback method, is characterized in that, comprising:
Transmitting terminal sends data to one or more receiving terminals, determines that described receiving terminal is to the feedback system of the feedback information of described data and/or the parameter relevant to feedback system, and notify described receiving terminal according to the characteristic of channel;
Wherein, the described characteristic of channel comprises one of following or combination: the whether restricted or limited degree of upstream bandwidth, whether ascending power is restricted or limited degree, whether downlink bandwidth is restricted or limited degree, whether descending power is restricted or limited degree;
The described parameter relevant to feedback system comprises one of following or combination: the packet parameters of the CRC length of described data, grouping feedback system, and wherein, described packet parameters comprises the encoding block number of quantity and/or each encoding block group of encoding block group;
Described method also comprises: set in advance the corresponding relation between the length range of data and CRC that described data need to be added; Described transmitting terminal, according to the length of described data, is determined the length of the CRC that described data are corresponding; Described receiving terminal receives described data, obtains CRC corresponding to described data, and judges that according to described CRC whether the reception of described data is correct;
Described transmitting terminal, according to the length of described data, determines that the operation of the length of the CRC that described data are corresponding is specially:
During the length of the first draft code block that the length of described data is less than or equal to that HARQ allows, described transmitting terminal, according to the length of described data or for transmitting the length of the encoding block of described data, is determined the CRC that described data are corresponding; Otherwise, described data being divided into a plurality of encoding blocks and transmitting, described feedback system is one by one during feedback system, and each encoding block is corresponding the longest CRC all, and when described feedback system is packet mode, each encoding block group is corresponding the longest CRC all.
2. method according to claim 1, is characterized in that, described data refer to the data that physical layer is to be sent.
3. method according to claim 1, is characterized in that, it is one of following that described feedback system comprises: implicit expression HARQ feedback, and when correct to described data receiver, carry out HARQ feedback or carry out HARQ feedback during to described data receiver mistake; Explicit HARQ feedback, all carries out HARQ feedback when correct to described data receiver and when mistake receives; Feedback system one by one, described transmitting terminal is divided into one or more encoding blocks by described data, and described receiving terminal feeds back each encoding block one by one; Grouping feedback system, described transmitting terminal is divided into a plurality of encoding blocks by described data, and described a plurality of encoding blocks are divided into one or more encoding block groups, and described receiving terminal feeds back each encoding block group.
4. method according to claim 3, is characterized in that, described a plurality of encoding blocks is divided into a plurality of encoding block groups and is specially:
According to the characteristic of channel and/or channel condition, described a plurality of encoding blocks are divided into a plurality of encoding block groups, the number of the encoding block in each encoding block group equates or is unequal;
Wherein, the number of the quality of the characteristic of channel and described encoding block group is inversely proportional to, or the number of the speed of changes in channel conditions and described encoding block group is inversely proportional to.
5. method according to claim 3, is characterized in that, described each encoding block group has independently HARQ feedback channel.
6. method according to claim 1, is characterized in that, described receiving terminal judges that according to described CRC the whether correct operation of reception of described data is specially:
Described receiving terminal, according to receiving described data, is determined the length of the CRC that described data are corresponding according to described corresponding relation;
After the described data that receive are removed to CRC, recalculate CRC, if the CRC recalculating is identical with the CRC receiving, the described data that judgement receives are correct, otherwise, the described error in data that judgement receives.
7. method according to claim 1, is characterized in that, the length of the first draft code block that described HARQ allows is determined one of in the following manner:
The value of the length of the first draft code block that arranges that described HARQ allows; Or,
The length of the first draft code block of dynamically determining according to the speed of the characteristic of channel or changes in channel conditions that described HARQ allows, wherein, the number of the quality of the described characteristic of channel and described encoding block group is inversely proportional to, and the speed of described changes in channel conditions and described HARQ allow the length of maximum encoding block to be inversely proportional to.
8. according to the method described in any one in claim 1 to 7, it is characterized in that, described channel condition comprises long term channel and/or the short-term channel quality of the resource that encoding block is occupied.
9. according to the method described in any one in claim 1 to 7, it is characterized in that, describedly notify described receiving terminal to comprise:
Described transmitting terminal is notified feedback system and/or the parameter relevant to described feedback system described in one or more described receiving terminals by control channel or administrative messag and prior to resource allocation message; Or
Described transmitting terminal is by carrying feedback system and/or the parameter relevant to described feedback system described in each receiving terminal in the resource allocation message sending to one or more receiving terminals.
10. according to the method described in any one in claim 1 to 7, it is characterized in that, described transmitting terminal refers to base station, relay station, terminal, and described receiving terminal refers to base station, relay station, terminal.
11. 1 kinds of HARQ feedback methods, is characterized in that, comprising:
Transmitting terminal, according to the length of data, is determined the length of the CRC that described data are corresponding;
Receiving terminal receives described data, obtains CRC corresponding to described data, and judges that according to described CRC whether the reception of described data is correct;
Described transmitting terminal, according to the length of described data, determines that the length of the CRC that described data are corresponding is specially:
During the length of the first draft code block that the length of described data is less than or equal to that HARQ allows, described transmitting terminal, according to the length of described data or for transmitting the length of the encoding block of described data, is determined the length of the CRC that described data are corresponding; Otherwise, described data being divided into a plurality of encoding blocks and transmitting, feedback system is one by one during feedback system, each encoding block is the longest CRC of correspondence all, when feedback system is packet mode, a plurality of encoding blocks are divided into one or more encoding block groups, each encoding block group is the longest CRC of correspondence all.
12. methods according to claim 11, is characterized in that, described data refer to the data that physical layer is to be sent.
13. methods according to claim 11, is characterized in that, described method also comprises:
Set in advance the corresponding relation between the length range of data and CRC that described data need to be added.
14. methods according to claim 13, is characterized in that,
Described corresponding relation is that described transmitting terminal is arranged the length of a plurality of encoding blocks of HARQ permission according to order from small to large, and the length of described a plurality of encoding blocks is divided into a plurality of encoding block groups according to order from small to large, the CRC of the equal corresponding preset length of a plurality of encoding blocks in each encoding block group, accordingly, described transmitting terminal is selected the length of described encoding block and selects corresponding CRC according to the length of described data; Or,
Described corresponding relation is that described transmitting terminal is arranged the length of a plurality of encoding blocks of HARQ permission according to order from big to small, and the length of described a plurality of encoding blocks is divided into a plurality of encoding block groups according to order from big to small, the CRC of the equal corresponding preset length of a plurality of encoding blocks in each encoding block group, accordingly, described transmitting terminal is selected the length of described encoding block and selects corresponding CRC according to the length of described data.
15. methods according to claim 14, is characterized in that, the encoding block length that described HARQ allows is determined one of in the following manner:
The value of the encoding block length of described HARQ permission is set; Or,
The length of the first draft code block of dynamically determining according to the speed of the characteristic of channel or changes in channel conditions that described HARQ allows, wherein, the number of the quality of the described characteristic of channel and described encoding block group is inversely proportional to, and the speed of described changes in channel conditions and described HARQ allow the length of maximum encoding block to be inversely proportional to.
16. methods according to claim 13, is characterized in that, described receiving terminal judges that according to described CRC the whether correct operation of reception of described data is specially:
Described receiving terminal, according to receiving described data, is determined the length of the CRC that described data are corresponding according to described corresponding relation;
After the described data that receive are removed to CRC, recalculate CRC, if the CRC recalculating is identical with the CRC receiving, the described data that judgement receives are correct, otherwise, the described error in data that judgement receives.
17. according to claim 11 to the method described in any one in 16, it is characterized in that, described transmitting terminal refers to base station, relay station, terminal, and described receiving terminal refers to base station, relay station, terminal.
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