CN101667900A - Method for feeding back HARQ - Google Patents
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- CN101667900A CN101667900A CN200810212534A CN200810212534A CN101667900A CN 101667900 A CN101667900 A CN 101667900A CN 200810212534 A CN200810212534 A CN 200810212534A CN 200810212534 A CN200810212534 A CN 200810212534A CN 101667900 A CN101667900 A CN 101667900A
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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 ofthe 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 modeof 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, the base station is the equipment that service is provided for terminal, the base station communicates by Uplink/Downlink and terminal, and descending is that relay station/terminal, the relay station direction to terminal is arrived in the base station, the up direction that is terminal to base station/relay station, relay station to the base station.
Adopting the base station to realize in the wireless communication system of wireless resource scheduling control, the scheduling of system wireless resource distributes to be finished by the base station.Radio Resource is carried out in the base station in abominable wireless environment scheduling divides timing, and communications reception node may occur the decoding situation of failure can cause the decline of this bust this and efficiency of transmission like this.
At present, main automatic re-transmission (Automatic Repeat Request abbreviates ARQ as) technology and forward error correction coding (Front Error Code the abbreviates FEC as) technology of adopting resisted the decline of channel.In the wireless communication system (for example 3G and B3G system) in future, adopt and mix automatic retransmission technique (Hybrid Automatic Repeat Request, abbreviate HARQ as) ensure the reliability of communication, and the raising efficiency of transmission, this HARQ technology combines the advantage of FEC technology and ARQ technology.For example, in IEEE 802.16e, HARQ has two kinds of patterns: catch up with merging (Chase Combing abbreviates CC as) pattern and steadily increase redundancy (Incremental Redundancy abbreviates IR as) pattern.
In the communication process of communication sending node and communications reception node, the communication sending node sends the first data burst (Burst) that passes to the communications reception node, correctly do not receive under the situation of this Burst at the communications reception node, can keep can't correct decoding Burst, and to the communication sending node send can't correctly receive reply indication (as NACK), the communication sending node receives after this replys indication, can retransmit this Burst to the communications reception node, the communications reception node merges decoding with Burst that retransmits and the Burst that receives before this, wherein, under the CC pattern, it is identical with the first Burst of biography to retransmit Burst, but under the IR pattern, re-transmission Burst is different with first biography Burst.
The response feedback of HARQ technology needs very sane transmission means, HARQ connect more and number of retransmissions more for a long time, the feedback information of HARQ (as ACK or NACK) can take a large amount of bandwidth usually.For example, in the up link of IEEE 802.16e, per 2 ack channels will occupy 72 subcarriers, and in the up link of Long Term Evolution (Long TermEvolution abbreviates LTE as) system, per 18 HARQ feedback channels will occupy 168 subcarriers.In order to reduce the feedback of ACK, IEEE 802.16e 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 big, for the code length with encoder mates, physical layer needs this Burst is split into several separate encoding block (CodingBlock, abbreviate CB as) transmit, in transmission course, as long as 1 encoding block is arranged makes mistakes, whole Burst needs to retransmit, and promptly transmitting correct encoding block also needs to retransmit, as can be seen, saved the resource that feedback channel takies though carry out the HARQ feedback, also produced a lot of unnecessary retransmission according to Burst.
Summary of the invention
Consider exist in the correlation technique in data transmission procedure, as long as there is 1 encoding block to make mistakes, whole data all need the problem that retransmits 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 feedback system and/or with the feedback system relevant parameter of receiving terminal to the feedback information of data according to the characteristic of channel, and the notice receiving terminal.
Wherein, above-mentioned data are meant the data that physical layer is to be sent.
Wherein, the above-mentioned characteristic of channel comprises one of following or combination: whether restricted whether restricted whether restricted whether upstream bandwidth or limited degree, ascending power or limited degree, downlink bandwidth or limited degree, descending power restricted or limited degree.
Wherein, it is one of following that above-mentioned feedback system comprises: implicit expression HARQ feedback receives data and to carry out the HARQ feedback when correct or data are received carrying out the HARQ feedback when wrong; Explicit HARQ feedback receives when correct and all carries out the HARQ feedback during wrong the reception data; Feedback system one by one, transmitting terminal is divided into one or more encoding blocks with data, and receiving terminal feeds back each encoding block one by one; The grouping feedback system, transmitting terminal is divided into a plurality of encoding blocks with 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 is unequal; Wherein, the number of the quality of the characteristic of channel and encoding block group is inversely proportional to, and perhaps, 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 with 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, this method also comprises: set in advance the corresponding relation between the length range of data and the CRC that data need be added; Transmitting terminal is according to the length of data, the length of the CRC of specified data correspondence; Whether receiving terminal receives data, obtains the CRC of data correspondence, and correct according to the reception of CRC judgment data.
Wherein, whether correct operation is specially receiving terminal according to the reception of CRC judgment data: receiving terminal is according to receiving data, according to the length of the CRC of corresponding relation specified data correspondence; Recomputate CRC after the data that receive are removed CRC,, judge that the data that receive are correct if the CRC that recomputates is identical with the CRC that receives, otherwise, judge the error in data that receives.
Wherein, transmitting terminal is according to the length of data, the operation of the length of the CRC of specified data correspondence 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 be used to transmit the length of the encoding block of data, the CRC of specified data correspondence; Otherwise, data being divided into a plurality of encoding blocks transmitting, feedback system is one by one during feedback system, the CRC that each encoding block is all corresponding the longest, when feedback system is packet mode, the CRC that each encoding block group is all corresponding the longest.
Wherein, the length of the first draft code block that allows of HARQ is determined one of in the following manner: the value of the length of the first draft code block that is provided with that HARQ allows; Perhaps, the length of the first draft code block of determining dynamically that HARQ allows according to the speed of the characteristic of channel or changes in channel conditions, 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: whether restricted whether restricted whether restricted whether upstream bandwidth or limited degree, ascending power or limited degree, downlink bandwidth or limited degree, descending power restricted or limited degree.
Wherein, above-mentioned channel condition comprises the 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 notified one or more receiving terminal feedback systems and/or the parameter relevant with feedback system by control channel or administrative messag and prior to resource allocation message; Perhaps, transmitting terminal is by carrying each receiving terminal feedback system and/or the parameter relevant with feedback system in the resource allocation message that sends 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 of specified data correspondence; Whether receiving terminal receives data, obtains the CRC of data correspondence, and correct according to the reception of CRC judgment data.
Wherein, above-mentioned data are meant the data that physical layer is to be sent.
Further, this method also comprises: set in advance the corresponding relation between the length range of data and the CRC that data need 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 from small to large order, 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 is selected corresponding CRC according to the length of data; Perhaps, 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 from big to small order, 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 is selected corresponding CRC according to the length of data.
Wherein, the encoding block length that allows of HARQ is determined one of in the following manner: the value that the encoding block length that HARQ allows is set; Perhaps, the length of the first draft code block of determining dynamically that HARQ allows according to the speed of the characteristic of channel or changes in channel conditions, 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, whether correct operation is specially receiving terminal according to the reception of CRC judgment data: receiving terminal is according to receiving data, according to the length of the CRC of corresponding relation specified data correspondence; Recomputate CRC after the data that receive are removed CRC,, judge that the data that receive are correct if the CRC that recomputates is identical with the CRC that receives, otherwise, judge the error in data that receives.
Wherein, transmitting terminal is according to the length of data, the operation of the length of the CRC of specified data correspondence 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 be used to transmit the length of the encoding block of data, the length of the CRC of specified data correspondence; Otherwise, data being divided into a plurality of encoding blocks transmitting, feedback system is one by one during feedback system, the CRC that each encoding block is all corresponding the longest, when feedback system is packet mode, a plurality of encoding blocks are divided into one or more encoding block groups, the CRC that each encoding block group is all corresponding the longest.
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 allow greater than HARQ, transmitting terminal is divided into a plurality of encoding blocks with 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 are meant the data that physical layer is to be sent.
Further, before one or more receiving terminals sent data, this method also comprises: transmitting terminal sent to receiving terminal with packet parameters at transmitting terminal, and wherein, packet parameters comprises the number of the encoding block of the quantity of encoding block group and/or 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 allow greater than HARQ, 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 the encoding block during a plurality of encoding block group in each encoding block group equates or is unequal, wherein, determine the number of the encoding block of the number of encoding block group and encoding block group according to the characteristic of channel and/or channel condition; Receiving terminal feeds back each encoding block group.
Wherein, above-mentioned data are meant the data that physical layer is to be sent.
Further, this method also comprises: for each encoding block group is provided with independently HARQ feedback channel.
Wherein, determine that according to the characteristic of channel and/or channel condition the method for number of the encoding block of the number of encoding block group and encoding block group is to preestablish or dynamically specify.
Wherein, determine that according to the characteristic of channel and/or channel condition 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; Perhaps, 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: whether restricted whether restricted whether restricted whether upstream bandwidth or limited degree, ascending power or limited degree, downlink bandwidth or limited degree, descending power restricted or limited degree.
Wherein, above-mentioned channel condition comprises the 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 come 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.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 (a) is a process schematic diagram of adjusting the HARQ feedback system of terminal according to the base station of the example one of the inventive method embodiment;
Fig. 1 (b) is a process schematic diagram of adjusting the HARQ feedback system of terminal according to the base station of the example one of the inventive method embodiment;
Fig. 2 (a) is the process schematic diagram that carries out the HARQ feedback according to the terminal of the example one of the inventive method embodiment according to the HARQ indication information of base station;
Fig. 2 (b) is the process schematic diagram that carries out the HARQ feedback according to the terminal of the example one of the inventive method embodiment according to the HARQ indication information of base station;
Fig. 3 (a) is the process schematic diagram that carries out the HARQ feedback according to the terminal of the example two of the embodiment of the invention according to the HARQ indication information of base station;
Fig. 3 (b) is the schematic diagram according to the CRC check method of the example two of the embodiment of the invention;
Fig. 4 (a) is according to the method schematic diagram that carries out the HARQ feedback in the HARQ transmission course of the example three of the embodiment of the invention by group;
Fig. 4 (b) is according to the method schematic diagram that carries out the HARQ feedback in the HARQ transmission course of the example three of the embodiment of the invention by group;
Fig. 5 (a) is according to the group technology schematic diagram in the HARQ transmission course of the example four of the embodiment of the invention;
Fig. 5 (b) is according to the group technology schematic diagram in the HARQ transmission course of the example four of the embodiment of the invention;
Fig. 5 (c) is according to the group technology schematic diagram in the HARQ transmission course of the example four of the embodiment of the invention;
Fig. 5 (d) is according to the group technology schematic diagram in the HARQ transmission course of the example four of the embodiment of the invention;
Fig. 5 (e) is according to the group technology schematic diagram in the HARQ transmission course of the example four of the embodiment of the invention.
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing.
Method embodiment
According to the embodiment of the invention, provide a kind of HARQ feedback method.
HARQ feedback method according to the embodiment of the invention comprises: transmitting terminal sends data to one or more receiving terminals, determine feedback system and/or with the feedback system relevant parameter of receiving terminal according to the characteristic of channel to the feedback information of data, and notice receiving terminal, wherein, above-mentioned data are meant the data that physical layer is to be sent.
By the technical scheme that the embodiment of the invention provided, by come 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.
Wherein, the above-mentioned characteristic of channel comprises one of following or combination: whether restricted whether restricted whether restricted whether upstream bandwidth or limited degree, ascending power or limited degree, downlink bandwidth or limited degree, descending power restricted or limited degree.Correspondingly, it is one of following that feedback system comprises: implicit expression HARQ feedback receives data and to carry out the HARQ feedback when correct, data are received carry out the HARQ feedback when wrong; Explicit HARQ feedback, whether data correctly receive, and all these data are carried out the 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; The 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 with 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, the number of encoding block is independently determined in each encoding block group, 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, perhaps, the number of the pace of change of channel condition and encoding block group is inversely proportional to.
Transmitting terminal is meant base station, relay station, terminal, and receiving terminal is meant base station, relay station, terminal.
In addition, the embodiment of the invention provides a kind of CRC of utilization to carry out the method for verification to receiving data, below this method is described.
At first, set in advance the corresponding relation between the length range of data and the CRC that data need add, then, transmitting terminal is according to the length of data, and the CRC of specified data correspondence is last, whether receiving terminal receives data, obtains the CRC of data correspondence, and correct according to the reception of CRC judgment data.
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 be used to transmit the length of the encoding block of data, the CRC of specified data correspondence; Otherwise, data being divided into a plurality of encoding blocks transmitting, feedback system is one by one during feedback system, the CRC check that each encoding block is all corresponding the longest, when feedback system is packet mode, the CRC check that each encoding block group is all corresponding the longest.
Receiving terminal is according to receiving data, according to the CRC length of corresponding relation specified data correspondence, recomputates CRC after the data that receive are removed CRC, if the CRC that recomputates is identical with the CRC that receives, judge that the data that receive are correct, otherwise, judge the error in data that receives.
Wherein, the length of the first draft code block that allows of HARQ is determined one of in the following manner: the value of the length of the first draft code block that is provided with that HARQ allows; Perhaps, the length of the first draft code block of determining that HARQ allows according to the speed of changes in channel conditions, 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 is inversely proportional to the length of the encoding block of HARQ permission maximum.
Example one
Fig. 1 a and Fig. 1 b show the schematic diagram that the HARQ feedback method of terminal is adjusted in the base station, and Fig. 2 a and Fig. 2 b show terminal is carried out the HARQ feedback according to the HARQ feedback method of base station schematic diagram.
As Fig. 1 a, the base station at first sends HARQ feedback method Indication message 1 to terminal before the terminal of supporting HARQ sends data, and this Indication message 1 indicating terminal adopts explicit HARQ feedback, and the HARQ encoding block is fed back one by one.Then, the 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 the Indication message 1 whether the HARQ encoding block is correctly received and to feed back.
Shown in Fig. 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, through behind the HARQ encoder of 1/2 code check with encoding block 1, encoding block 2, encoding block 3 and encoding block 4 send to terminal, terminal shows the HARQ feedback one by one to each encoding block, wherein, encoding block 1, encoding block 2 and encoding block 3 are correctly decoded, and terminal is to base station feedback ACK, and encoding block 4HARQ encoding block is made mistakes, terminal is fed back to NACK, the base station retransmits the 4th HARQ encoding block according to the feedback of terminal, and terminal receives the encoding block 4 that retransmits, be correctly decoded and feeding back ACK, so far, whole data burst transmission finishes, and as seen this transmission course only needs 4 HARQ feedback channels.
The base station is judged up when limited, can reduce the quantity of HARQ uplink feedback channel.The base station sends HARQ feedback method Indication message 2 to terminal, and these Indication message 2 indicating terminals adopt explicit HARQ feedback and the HARQ encoding block is divided into groups to feed back.Shown in Fig. 2 b, this data burst is divided into 3 groups behind the Padding again, form 4800 bits after adding the CRC of 16 bits respectively, the group of 9600 bits and 4800 bits, the HARQ feedback is carried out at group, 9600 bits are split as 2 4800 bits, thereby satisfy the code length that 4 HARQ allow.Through behind the HARQ encoder of 1/2 code rate encoding block group 1, encoding block group 2 and encoding block group 3 being sent to terminal, terminal is carried out the 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 is fed back to NACK, the 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 as seen this transmission course only needs 3 HARQ feedback channels.
Under the situation that the characteristic of channel changes, the base station can be adjusted the feedback system of terminal neatly, shown in Fig. 1 b, the base station is before the terminal of supporting HARQ sends data, at first send HARQ resource allocation message 1 to terminal, comprise HARQ feedback method indication information in the resource allocation message 1, this indication information 1 indicating terminal adopts explicit HARQ feedback, and the HARQ encoding block is fed back one by one.The base station is judged up when limited, and the base station sends HARQ resource allocation message 2 to terminal, comprises HARQ feedback method indication information in the resource allocation message 2, and these indication information 2 indicating terminals adopt explicit HARQ feedback, and to the HARQ encoding block feedback of dividing into groups.
In addition, the embodiment of the invention also provides whether correct method of data that a kind of receiving terminal judges its reception according to CRC, is elaborated below by implementing two pairs of these methods.
Example two
Set in advance the length range of data burst and the corresponding relation between the 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 will gathering 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, { 48,96,144, the CRC length of 192} is CRC-8, { 288,384,480, the CRC length of 960} is CRC-12, { 1920,2880,3840, the CRC length of 4800} is CRC-16.Accordingly, with { 48,96,144, the data burst length (can comprise Padding) that 192} removes the CRC correspondence of 8 bits for 40,88,136,184}, with { 288,384,480, the data burst length (can comprise Padding) that 960} removes the CRC correspondence of 12 bits is { 276,372,468,948} is with { 1920,2880,3840, the data burst length (can comprise Padding) that 4800} removes the CRC correspondence of 16 bits is { 1904,2864,3824,4784}.
Show the schematic diagram of CRC check method as Fig. 3, as shown in Figure 3, a data burst length is 132 bits, the HARQ coded block transmission that only to need a length be 144 bits, and the data burst of the HARQ encoding block correspondence of 144 bits is 136 bits, needs 4 bits of Padding to become 136 bits, adds CRC-8 again, become 144 bits, and the data burst of this 144 bit is become 192 bits through the HARQ coding of 3/4 code rate send.
Need to prove,,, all select the longest CRC-16 of length as the encoding block among Fig. 2 for the data burst that needs split.
Example three
Fig. 4 a and Fig. 4 b show the method schematic diagram that in the HARQ transmission course data burst is divided into groups respectively.
Shown in Fig. 4 a, data burst length through Padding is 23920 bits, because the maximum length of the data burst that HARQ allows is 4800 bits, therefore just this data burst is divided into 5 groups and transmits, each encoding block group comprises 4784 bits, add the CRC of 16 bits respectively, become 4800 bits, HARQ coding through 1/2 code rate forms 5 HARQ encoding blocks that length is 9600 bits, comprise a HARQ encoding block in each encoding block group, the equal in length of the data burst in each encoding block group.
Shown in Fig. 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 the HARQ feedback.At first, Padding is carried out again in data bursts, 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 the CRC of 16 bits respectively after, become 9600 bits and 14400 bits; Again 9600 bits are split 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 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 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 CRC check.
Example four
Fig. 5 a, Fig. 5 b, Fig. 5 c, Fig. 5 d and Fig. 5 e show the schematic diagram of the group technology in the HARQ transmission course respectively.
Shown in Fig. 5 a, data burst length through Padding is 28704 bits, because the maximum length of the data burst that HARQ allows is 4800 bits, when upstream bandwidth is not limited in order to improve descending efficiency of transmission, this data burst can be divided into 6 encoding block groups transmits, wherein, each encoding block group comprises the data of 4784 bits, add the CRC of 16 bits respectively, become 4800 bits, through 6 HARQ encoding blocks of HARQ coding formation of 1/2 code rate, comprise a HARQ encoding block in each group, then the equal and opposite in direction of 6 encoding block groups like this, needs 6 HARQ feedback channels.
Shown in Fig. 5 b, when upstream bandwidth is limited, for quantity that reduces the ascending HARQ feedback and the expense that reduces the HARQ feedback channel, one is 23936 bits through the data burst length of Padding again, at first data burst is divided into 4784 bits, 9584 bits, 4784 bits and 4 encoding block groups of 9584 bits, add the CRC of 16 bits respectively, become 4800 bits, 9600 bits, 4800 bits and 9600 bits, again 9600 bits are split 2 4800 bits, form 6 4800 bits altogether, 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, and encoding block and encoding block 6 form encoding block group 4, every group of individual CRC verification.Like this this data burst is divided into 4 groups and transmits, carry out the HARQ feedback, need 4 HARQ feedback channels this moment at each encoding block group.
Shown in Fig. 5 c, when upstream bandwidth is still limited, the quantity of ascending HARQ feedback is continued to reduce in the 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, carry out the HARQ feedback at 3 groups.At first, data burst is divided into 9584 bits, 14384 bits, 3 parts of 4784 bits are added the CRC of 16 bits respectively, become 9600 bits, 14400 bits and 4800 bits, again 9600 bits are split 2 4800 bits, 14400 bits are split as 3 4800 bits, form 6 4800 bits altogether, and the HARQ coding that the data of 6 4800 bits is carried out 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, and each encoding block group has the individual CRC verification, needs 3 HARQ feedback channels this moment.
Shown in Fig. 5 d, when upstream bandwidth was still limited, the quantity of ascending HARQ feedback was continued to reduce in the 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 transmits, and adopts 2 groups to carry out the HARQ feedback.At first, data burst is divided into 14384 bits, 2 parts of 14384 bits are added the CRC of 16 bits respectively, become 14400 bits and 14400 bits; Because the maximum length of the data that the HARQ coding allows is 4800 bits, again 14400 bits are split 3 4800 bits, 14400 bits are split as 3 4800 bits, form 6 4800 bits altogether, the data of 6 4800 bits are carried out the HARQ coding 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 the individual CRC verification, needs 2 HARQ feedback channels this moment.
Shown in Fig. 5 e, when upstream bandwidth was still limited, the quantity of ascending HARQ feedback was continued to reduce in the 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 transmits, and carries out the HARQ feedback at group.At first, data burst is added the CRC of 16 bits, become 24000 bits; Because the maximum length of the data that the HARQ coding allows is 4800 bits, again 24000 bits are split 6 4800 bits, the data of 6 4800 bits are carried out the HARQ coding 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, needs 1 HARQ feedback channel this moment.
According to the embodiment of the invention, provide a kind of HARQ feedback method.
HARQ feedback method according to the embodiment of the invention comprises: according to the length of transmitting terminal according to data, the length of the CRC of specified data correspondence; Whether receiving terminal receives data, obtains the CRC of data correspondence, and correct according to the reception of the length judgment data of CRC, and wherein, above-mentioned data are meant the data that physical layer is to be sent.
Further, this method also comprises: set in advance the corresponding relation between the length range of data and the CRC that data need be added, and corresponding relation is notified to transmitting terminal and receiving terminal.
Below the length range that data are set and the dual mode of the corresponding relation between the CRC length are described.
Mode one: transmitting terminal is arranged the length of a plurality of encoding blocks that HARQ allows 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 from small to large order, 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 is selected corresponding CRC according to the length of described data; Perhaps,
Mode two: transmitting terminal is arranged the length of a plurality of encoding blocks that HARQ allows 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 from big to small order, 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 is selected corresponding CRC according to the length of data.
Wherein, the encoding block length that allows of HARQ one of can be in the following manner determined: the value that the encoding block length that HARQ allows is set; Perhaps, the length of the first draft code block of determining dynamically that HARQ allows according to the speed of the characteristic of channel or changes in channel conditions, 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 of specified data correspondence 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 be used to transmit the length of the encoding block of data, the CRC of specified data correspondence; Otherwise, data being divided into a plurality of encoding blocks transmitting, feedback system is one by one during feedback system, the CRC check that each encoding block is all corresponding the longest, when feedback system is packet mode, the CRC check that each encoding block group is all corresponding the longest.
In addition, particularly, receiving terminal is according to the data that receive, according to the CRC length of corresponding relation specified data correspondence; Recomputate CRC after the data that receive are removed CRC,, judge that the data that receive are correct if the CRC that recomputates is identical with the CRC that receives, otherwise, judge the error in data that receives.
According to the embodiment of the invention, provide a kind of HARQ feedback method.
HARQ feedback method according to the embodiment of the invention comprises: transmitting terminal sends data to one or more receiving terminals, during the length of the first draft code block that data allow greater than HARQ, 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 one or more receiving terminals sent data, method also comprises: transmitting terminal sent to receiving terminal with packet parameters at transmitting terminal, 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 invention, provide a kind of HARQ feedback method.
HARQ feedback method according to the embodiment of the invention comprises: transmitting terminal sends data to one or more receiving terminals, during the length of the first draft code block that data allow greater than HARQ, 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, determine the number of the encoding block of the number of encoding block group and encoding block group according to the characteristic of channel and/or channel condition; 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 are meant the data that physical layer is to be sent.
In addition, determine that according to the characteristic of channel and/or channel condition 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; Perhaps, 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 number of the encoding block of the number of described encoding block group and encoding block group is to preestablish 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: whether restricted whether restricted whether restricted whether upstream bandwidth or limited degree, ascending power or limited degree, downlink bandwidth or limited degree, descending power restricted or limited degree, and channel condition comprises the long term channel and/or the short-term channel quality of the resource that encoding block is occupied.
As mentioned above,,, reduced the resource that feedback channel occupies, improved the spectrum efficiency of feedback efficiency and wireless communication system by come the feedback system of specified data according to the characteristic of channel by means of HARQ feedback method provided by the invention.
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 (35)
1. a HARQ feedback method is characterized in that, comprising:
Transmitting terminal sends data to one or more receiving terminals, determines described receiving terminal to the feedback system of the feedback information of described data and/or the parameter relevant with described feedback system according to the characteristic of channel, and notifies described receiving terminal.
2. method according to claim 1 is characterized in that described data are meant the data that physical layer is to be sent.
3. method according to claim 1, it is characterized in that the described characteristic of channel comprises one of following or combination: whether restricted whether restricted whether restricted whether upstream bandwidth or limited degree, ascending power or limited degree, downlink bandwidth or limited degree, descending power restricted or limited degree.
4. method according to claim 1 is characterized in that, it is one of following that described feedback system comprises: implicit expression HARQ feedback, and described Data Receiving is carried out the HARQ feedback when correct or carry out the HARQ feedback during to described Data Receiving mistake; Explicit HARQ feedback is all carried out the HARQ feedback when correct and during wrong the reception to described Data Receiving; Feedback system one by one, described transmitting terminal is divided into one or more encoding blocks with described data, and described receiving terminal feeds back each encoding block one by one; The grouping feedback system, described transmitting terminal is divided into a plurality of encoding blocks with 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.
5. method according to claim 4 is characterized in that, described 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 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, and perhaps, the number of the speed of changes in channel conditions and described encoding block group is inversely proportional to.
6. method according to claim 4 is characterized in that, described each encoding block group has independently HARQ feedback channel.
7. method according to claim 1, it is characterized in that, the described parameter relevant with feedback system comprises one of following or combination: the CRC length of described data, the packet parameters of described grouping feedback system, wherein, described packet parameters comprises the encoding block number of quantity and/or each encoding block group of encoding block group.
8. method according to claim 7 is characterized in that, described method also comprises:
Set in advance the corresponding relation between the length range of data and the CRC that described data need be added; Described transmitting terminal is determined the length of the CRC of described data correspondence according to the length of described data;
Described receiving terminal receives described data, obtains the CRC of described data correspondence, and judges according to described CRC whether the reception of described data is correct.
9. method according to claim 8 is characterized in that, described receiving terminal is judged the reception of described data according to described CRC, and whether correct operation is specially:
Described receiving terminal is determined the length of the CRC of described data correspondence according to receiving described data according to described corresponding relation;
Recomputate CRC after the described data that receive are removed CRC,, judge that the described data that receive are correct if the CRC that recomputates is identical with the CRC that receives, otherwise, judge the described error in data that receives.
10. method according to claim 7 is characterized in that, described transmitting terminal is according to the length of described data, determines that the operation of length of the CRC of described data correspondence 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 is according to the length of described data or be used to transmit the length of the encoding block of described data, determines the CRC of described data correspondence; Otherwise, described data being divided into a plurality of encoding blocks transmitting, described feedback system is one by one during feedback system, the CRC that each encoding block is all corresponding the longest, when described feedback system is packet mode, the CRC that each encoding block group is all corresponding the longest.
11. method according to claim 10 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 is provided with that described HARQ allows; Perhaps,
The length of the first draft code block of determining dynamically that described HARQ allows according to the speed of the characteristic of channel or changes in channel conditions, 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.
12. according to each described method in the claim 1 to 11, it is characterized in that, the described characteristic of channel comprise following one of at least or combination: whether restricted whether restricted whether restricted whether upstream bandwidth or limited degree, ascending power or limited degree, downlink bandwidth or limited degree, descending power restricted or limited degree.
13., it is characterized in that described channel condition comprises the long term channel and/or the short-term channel quality of the resource that encoding block is occupied according to each described method in the claim 1 to 11.
14. according to each described method in the claim 1 to 11, it is characterized in that, describedly notify described receiving terminal to comprise:
Described transmitting terminal is notified described feedback system of one or more described receiving terminals and/or the parameter relevant with described feedback system by control channel or administrative messag and prior to resource allocation message; Perhaps
Described transmitting terminal is by carrying described feedback system of each receiving terminal and/or the parameter relevant with described feedback system in the resource allocation message that sends to one or more receiving terminals.
15. according to each described method in the claim 1 to 11, it is characterized in that described transmitting terminal refers to base station, relay station, terminal, described receiving terminal refers to base station, relay station, terminal.
16. a HARQ feedback method is characterized in that, comprising:
Transmitting terminal is determined the length of the CRC of described data correspondence according to the length of data;
Described receiving terminal receives described data, obtains the CRC of described data correspondence, and judges according to described CRC whether the reception of described data is correct.
17. method according to claim 16 is characterized in that, described data are meant the data that physical layer is to be sent.
18. method according to claim 16 is characterized in that, described method also comprises:
Set in advance the corresponding relation between the length range of data and the CRC that described data need be added.
19. method according to claim 18 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 from small to large order, 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 is selected corresponding CRC according to the length of described data; Perhaps,
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 from big to small order, 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 is selected corresponding CRC according to the length of described data.
20. method according to claim 19 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; Perhaps,
The length of the first draft code block of determining dynamically that described HARQ allows according to the speed of the characteristic of channel or changes in channel conditions, 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.
21. method according to claim 17 is characterized in that, described receiving terminal is judged the reception of described data according to described CRC, and whether correct operation is specially:
Described receiving terminal is determined the length of the CRC of described data correspondence according to receiving described data according to described corresponding relation;
Recomputate CRC after the described data that receive are removed CRC,, judge that the described data that receive are correct if the CRC that recomputates is identical with the CRC that receives, otherwise, judge the described error in data that receives.
22. method according to claim 18 is characterized in that, described transmitting terminal determines that according to the length of described data the length of the CRC of described data correspondence 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 is according to the length of described data or be used to transmit the length of the encoding block of described data, determines the length of the CRC of described data correspondence; Otherwise, described data are divided into a plurality of encoding blocks to be transmitted, described feedback system is one by one during feedback system, the CRC that each encoding block is all corresponding the longest, when described feedback system is packet mode, a plurality of encoding blocks are divided into one or more encoding block groups, the CRC that each encoding block group is all corresponding the longest.
23. according to each described method in the claim 16 to 22, it is characterized in that described transmitting terminal refers to base station, relay station, terminal, described receiving terminal refers to base station, relay station, terminal.
24. a HARQ feedback method is characterized in that, comprising:
Transmitting terminal sends data to one or more receiving terminals, during the length of the first draft code block that described data allow greater than HARQ, transmitting terminal is divided into a plurality of encoding blocks with described data, and described 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;
Described receiving terminal feeds back each encoding block group.
25. method according to claim 24 is characterized in that, described data are meant the data that physical layer is to be sent.
26. method according to claim 24 is characterized in that, before one or more receiving terminals sent data, described method also comprised at transmitting terminal:
Described transmitting terminal sends to described receiving terminal with packet parameters, and wherein, described packet parameters comprises the number of the encoding block of the quantity of encoding block group and/or each encoding block group.
27. according to each described method in the claim 24 to 26, it is characterized in that described transmitting terminal refers to base station, relay station, terminal, described receiving terminal refers to base station, relay station, terminal.
28. a HARQ feedback method is characterized in that, comprising:
Transmitting terminal sends data to one or more receiving terminals, during the length of the first draft code block that described data allow greater than HARQ, transmitting terminal is divided into a plurality of encoding blocks with described data in advance, described a plurality of encoding blocks are divided into one or more encoding block groups, and the number of the encoding block during a plurality of encoding block group in each encoding block group equates or is unequal, wherein, determine the number of the encoding block of the number of described encoding block group and encoding block group according to the characteristic of channel and/or channel condition;
Described receiving terminal feeds back each encoding block group.
29. method according to claim 28 is characterized in that, described data are meant the data that physical layer is to be sent.
30. method according to claim 28 is characterized in that, described method also comprises:
For described each encoding block group is provided with independently HARQ feedback channel.
31. method according to claim 28 is characterized in that, determines that according to the characteristic of channel and/or channel condition the method for number of the encoding block of the number of described encoding block group and encoding block group is to preestablish or dynamically specify.
32. method according to claim 28 is characterized in that, determines that according to the characteristic of channel and/or channel condition the number of described encoding block group comprises:
The number of the quality of the characteristic of channel and described encoding block group is inversely proportional to; Perhaps,
The number of the speed of changes in channel conditions and described encoding block group is inversely proportional to.
33. according to each described method in the claim 28 to 32, it is characterized in that, the described characteristic of channel comprise following one of at least or combination: whether restricted whether restricted whether restricted whether upstream bandwidth or limited degree, ascending power or limited degree, downlink bandwidth or limited degree, descending power restricted or limited degree.
34., it is characterized in that described channel condition comprises the long term channel and/or the short-term channel quality of the resource that encoding block is occupied according to each described method in the claim 28 to 32.
35. according to each described method in the claim 28 to 32, it is characterized in that described transmitting terminal refers to base station, relay station, terminal, described receiving terminal refers to base station, relay station, terminal.
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