CN102075285B - Rate matching method and device - Google Patents
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- CN102075285B CN102075285B CN 200910226243 CN200910226243A CN102075285B CN 102075285 B CN102075285 B CN 102075285B CN 200910226243 CN200910226243 CN 200910226243 CN 200910226243 A CN200910226243 A CN 200910226243A CN 102075285 B CN102075285 B CN 102075285B
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Abstract
The invention discloses a rate matching method which comprises the following steps of: interleaving coded bit sequences with coded information bit sequence channels to obtain mother coed words; determining that the length NFB_Buffer of a circulating cache region to be an integral multiple of a preset value to ensure that symbols of overlapped parts are aligned during multiple times of transmission; sequentially storing NFB_Buffer bits of the mother code words into the circulating cache region; and selecting a section of mother code words from the circulating cache region to generate a data sub-packet, wherein the length of the data sub-packet is matched with the size of a distributed physical channel resource. The invention ensures that modulated symbols can be aligned according to a specific rule conforming to a system requirement during multiple-time transmission so as to improve the property of a link and reduce the complexity of system realization.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of speed matching method and device.
Background technology
At present, digital communication system is the communication system of commonly using.As shown in Figure 1, digital communication system is comprised of transmitting terminal, channel and receiving terminal usually.Wherein, transmitting terminal generally includes the parts such as information source, source encoder, channel encoder and modulator, receiving terminal generally includes demodulator, channel decoder, source decoder and the stay of two nights, has channel (or storage medium) between transmitting terminal and receiving terminal, and has noise source in channel.In digital communication system, channel code chain (comprising channel decoding, modulation /demodulation etc.) is the key technology of whole digital communication physical layer, and it has determined the validity and reliability of digital communication system bottom transmission.In up-to-date 3GPP LTE research on standard, channel code chain has adopted a series of up-to-date technology, in the simple implementation complexity, has improved the physical layer transmission performance.Wherein, in up-to-date 3GPP standard agreement, adopted based on quadratic polynomial and replaced the Turbo code of (Quadratic Polynomial Permutation is called for short QPP) interleaver as the channel coding schemes of data service; Employing realizes sending the length of data and the coupling of distribute of the size of physical channel resources based on circulating buffer memory rate coupling (Circular Buffer Rate Matching is referred to as CBRM) method.Simultaneously, in order to obtain the higher availability of frequency spectrum and hardware circuit solution, the high-order modulating such as 16QAM, 64QAM have been adopted.
Turbo code is one of forward error correction coding of present optimum of generally acknowledging, be widely adopted the chnnel coding solution as data traffic transmission in numerous standard agreements, and along with the increase of decoding iterations, its decoding error-correcting performance will be by constantly perfect.Turbo code commonly used comprises Binary Turbo codes and dual-binary system tailbaiting Turbo code at present.Usually the binary system Turbo coding of using is a kind of parallel cascade codes with inner interleaver, is generally formed by two identical recursive systematic convolutional code (RSC) component code encoder parallel cascades of structure.Just used a kind of like this Binary Turbo codes in Wideband Code Division Multiple Access (WCDMA) and TDS-CDMA system, structure as shown in Figure 2, the binary message sequence S of input
KGenerate one tunnel verification sequence P1 through first component code encoder
KSimultaneously, the binary message sequence S of input
KAfter interweaving through the interleaver in Turbo code, generate another road verification sequence P2 by second component code encoder
KAt this moment, if not to the coded-bit punching, the bit rate output of Turbo coding is 1/3, and the sequences of code bits that output obtains is s
1, p1
1, p2
1, s
2, p1
2, p2
2... s
K, p1
K, p2
K, wherein, K is the length of the binary message sequence of input.
After encoding, information bit sequence utilize the circulating buffer memory rate matching algorithm to realize sending the length of data and the coupling of distribute of the size of physical channel resources.The circulating buffer memory rate matching process is can generate to delete the remaining outstanding simple algorithm of pattern performance.As shown in Figure 3, in the situation that the sequences of code bits that code check is the output of 1/3, Turbo coding can be isolated three data bit streams after bit separation: systematic bits stream S, the first check bit stream P1 and the second check bit stream P2.In the circulating buffer memory rate matching algorithm, each data flow will be rearranged by sub-interleaver separately, is called as in piece to interweave.Systematic bits after resetting is placed on the starting position, places alternately subsequently the check bit stream of two rearrangements, be called as interblock and interweave.Interweave in above-mentioned and mother that interblock obtains after interweaving piles up in the circular buffer district.For the code check (Rate) of expectation, it is that somewhere starting point from the circular buffer district calls over L bit that the bit of circular buffering rate-matched is selected, as the output of rate-matched, wherein the length of L and distribute the size of physical channel resources to be complementary.Generally speaking, the bit that is selected for transmission can begin to be read out from any one point in circular buffer district and, if arrive the end in circular buffer district, can around the starting position continuation read data to the circular buffer district, read L bit until complete.
Mixed automatic retransfer request (HARQ) is extremely important link adaptation techniques in a kind of digital communication system.Receiving terminal carries out decoding to the HARQ packet of its reception, if decoding correctly the feeding back ACK signal to transmitting terminal, notify it to send new HARQ packet; If decoding failure feeds back the NAK signal to transmitting terminal, the request transmitting terminal resends the HARQ packet.Receiving terminal merges decoding by the packet that repeatedly retransmits being carried out steadily increase redundancy (Increasing Redundancy is called for short IR) or chase, can improve its successfully decoded probability, realizes the high reliability request of link transmission.
Under mixed automatic retransfer request mode, the start position that can specify different positions to read as each transmitting HARQ packet in the circular buffer district.Redundancy versions (Redundancy Version, referred to as RV) definition namely determined a plurality of start positions that the HARQ packet reads in the circular buffer district, the redundancy versions value has just been determined the concrete start position that this transmitting HARQ packet reads in the circular buffer district.For example, in LTE, redundancy versions has defined the starting point that reads in the circular buffer district, is used for selecting a segment encode word to generate current HARQ bag.If the RV number is 4, redundancy versions has indicated four positions with 0,1,2 and 3 from left to right orders equably in the circular buffer district.The long attached bag of L that each HARQ retransmits is by from the starting point of redundancy versions definition, the L that chooses clockwise bit composition.Motion and standard that more concrete description can be mated with reference to the virtual circulating buffer memory rate of LTE are not described in detail in this.
When repeatedly transmitting, the HARQ packet that transmits is called the HARQ attached bag.HARQ attached bag designator (HARQ subpacket identifier, referred to as SPID) be applied at present in the IEEE802.16e standard, it is identical with acting on of redundancy versions RV in essence, all can be used to determine the particular location of HARQ attached bag data in the circular buffer district.In the IEEE802.16e system, HARQ attached bag designator and HARQ attached bag length have defined original position and the length of HARQ attached bag in the circular buffer district jointly, in order to select the segment encode word to generate current HARQ attached bag in the circular buffer district.Wherein, the span of SPID is { 00,01,10,11}.The SPID value one of transmission is decided to be 00 first, and the SPID value in other whens re-transmissions is welcome or selecting in its scope in certain sequence.That is to say, when repeatedly transmitting, may reuse some SPID values, perhaps also can not use some SPID values.Under HARQ mechanism, may produce a plurality of HARQ attached bags under the data based on same female code.When two or more HARQ attached bags read in female code the same position bit, overlapping (Overlapping) phenomenon had just occured.In order to improve systematic function, should avoid overlapping phenomenon part modulation symbol when modulating mapping not line up as far as possible, and cover more female code data.
In practical communication system, system assignment is subjected to a certain extent restriction for the length in the circular buffer district of each female code block.And the length in circular buffer district and performance and the implementation complexity of whole link have close contacting.When the circular buffer section length is chosen when improper, under HARQ mechanism, when repeatedly the different attached bags of transmission overlap phenomenon, might cause the modulation symbol of different attached bags not line up or problem that modulation symbol alignment situation does not meet system requirements occurs, thereby have a strong impact on the performance of whole communication link, perhaps increase greatly the implementation complexity of communication link.
Specifically, take the 16e communication system as example, as shown in Figure 4, be Nep in information bit sequence length, encoder bit rate is in 1/3 situation, and the circular buffer district is K (K=3*Nep-2) bit, and namely the circular buffer section length is not identical with female code code word size.And the length of the attached bag S1 of transmission is L1 bit for the first time, and modulation system is 64QAM; The length of the attached bag S2 of transmission is L2 bit for the second time, and modulation system is 64QAM.The attached bag S2 of transmission is when transferring circular buffer last bit of district (i.e. K-1 bit) for the second time, and continuation begins transmission from the 0th bit in circular buffer district.So, after first attached bag modulation mapping, the 0th bit, the 1st bit, the 2nd bit, the 3rd bit, the 4th bit, the 5th bit in circular buffer district have formed the 0th modulation symbol jointly.After second attached bag modulation mapping, K-4 bit, a K-3 bit, a K-2 bit, a K-1 bit, the 0th bit, the 1st bit in circular buffer district have formed n modulation symbol jointly.Wherein, bit index is since 0, and the modulation symbol index is since 0.As seen, choose improperly due to the circular buffer section length, the 0th bit in circular buffer district and the 1st bit position in twice transmission modulation symbol does not line up.That is to say, choose improperly due to the circular buffer section length, cause in twice transmission, the position of bit in modulation symbol of the lap of the first attached bag and the second attached bag do not line up., and do not line up with the 0th modulation symbol or the 1st modulation symbol of first attached bag from the 2nd bit in circular buffer district as n+1 modulation symbol.Briefly, the lap of first attached bag and second attached bag modulation symbol when modulating mapping does not line up.
Summary of the invention
Position when repeatedly transmitting in order to solve same bits in modulation symbol is not identical, be that when under identical modulating mode, overlapping phenomenon occuring, the modulation symbol in the different pieces of information attached bag does not line up, thereby cause link performance to descend or increase the problem of system's implementation complexity, the present invention proposes a kind of speed matching method and device.
Speed matching method provided by the invention comprises step:
To interweave to the sequences of code bits after the information bit sequence chnnel coding and obtain female code code word;
Determine the length N in circular buffer district
FB_BufferBe the integral multiple of predetermined value, make when repeatedly transmitting the lap symbol aligned;
N with described female code code word
FB_BufferIndividual bit leaves in the circular buffer district successively;
Select one section female code code word to produce data sub-packets from the circular buffer district, the length of this data sub-packets with distribute the size of physical channel resources to be complementary.
Rate matching apparatus provided by the invention comprises:
Interleaver, being used for to interweave to the sequences of code bits after the information bit sequence chnnel coding obtains female code code word;
The length determining unit is for the length N of determining the circular buffer district
FB_BufferBe the integral multiple of predetermined value, make when repeatedly transmitting the lap symbol aligned;
The circular buffer district is used for storing the N of described female code code word
FB_BufferIndividual bit;
Rate matchers is used for selecting one section female code code word to produce data sub-packets from the circular buffer district, the length of this data sub-packets with distribute the size of physical channel resources to be complementary.
Utilize speed matching method provided by the invention and device, has following beneficial effect: the selection of the length by the circular buffer district, can guarantee farthest that the transmission of data attached bag is when overlapping, lap is-symbol or half symbol or every two symbol aligned, can avoid not lining up due to symbol the problem of the HARQ retransmission performance decline that causes, thereby improve the performance of link, the complexity that the reduction system realizes.
Description of drawings
Fig. 1 is to be the structured flowchart of digital communication system of the prior art;
Fig. 2 is the channel encoder structure chart of available technology adopting Turbo coding;
Fig. 3 is in prior art in the situation that the schematic diagram of the rate-matched process of IEEE802.16e standard, 1/3 code check, employing Turbo coding;
Fig. 4 is to be according to prior art is analyzed the schematic diagram that modulation symbol does not line up;
Fig. 5 is the speed matching method outflow figure that the present invention proposes;
Fig. 6 is the rate matching apparatus structure chart that the present invention proposes;
Fig. 7 is that one or two transmission attached bag of the embodiment of the present invention overlaps but the annular schematic diagram of symbol aligned;
Fig. 8 is that 2 two transmission attached bags of the embodiment of the present invention overlap but half symbol aligned annular schematic diagram;
Fig. 9 is that 3 two transmission attached bags of the embodiment of the present invention overlap but the annular schematic diagram of symbol aligned;
Figure 10 is that 4 two transmission attached bags of the embodiment of the present invention overlap but the annular schematic diagram of symbol aligned;
Figure 11 is that 5 two transmission attached bags of the embodiment of the present invention overlap but the annular schematic diagram of symbol aligned;
Figure 12 is that 6 two transmission attached bags of the embodiment of the present invention overlap but the annular schematic diagram of symbol aligned;
Figure 13 is that 7 two transmission attached bags of the embodiment of the present invention overlap but the annular schematic diagram of symbol aligned;
Figure 14 is that 8 two transmission attached bags of the embodiment of the present invention overlap but the annular schematic diagram of symbol aligned.
Embodiment
Consider that the symbol that may occur in current techniques two transmission attached bags occur does not line up when overlapping, or half symbols does not line up, or alignment thereof does not meet the problem of system's particular requirement, the present invention does not line up the problem of the HARQ retransmission performance decline that causes by adopting the speed matching method that the circular buffer section length is limited due to symbol in the time of can avoiding rate-matched.
The speed matching method that the present invention proposes as shown in Figure 5, comprises the following steps:
S101, to interweave to the sequences of code bits after the information bit sequence chnnel coding and obtain female code code word, it is one of following that the mode of preferably, information bit sequence being encoded comprises: the turbo code, adopt the Turbo coding when stinging tail turbo code, low density parity check code chnnel coding.
S102 determines the length N in circular buffer district
FB_BufferBe the integral multiple of predetermined value, make when repeatedly transmitting, as retransmitting and when repeatedly transmitting makeing mistakes, the data sub-packets lap symbol aligned that adopts identical order of modulation to modulate.As previously mentioned, existing redundancy versions has been determined a plurality of start positions that the HARQ packet reads in the circular buffer district, HARQ attached bag designator is used for determining the particular location of HARQ attached bag data in the circular buffer district, determine that based on the present invention the length in circular buffer district is the technological means of the integral multiple of predetermined value according to these information, make the data sub-packets lap symbol aligned that adopts identical modulation to finish.
S103 is with the N of described female code code word
FB_BufferIndividual bit leaves in the circular buffer district successively.
S104, select one section female code code word to produce data sub-packets from the circular buffer district, the length of this data sub-packets with distribute the size of physical channel resources to be complementary, the mode of selecting by: from the somewhere starting point in circular buffer district call over L bit being complementary of the size of distribution physical channel resources as the output of rate-matched, the bit that is selected for transmission can begin to be read out from any one point in circular buffer district and, if arrive the end in circular buffer district, can be around the starting position continuation read data to the circular buffer district, read L bit until complete.
So far, the rate-matched process finishes, and then can modulate rear employing mixed automatic retransmission request mechanism transmission to the data sub-packets that produces.Make when repeatedly transmitting, adopt the data sub-packets of identical order of modulation modulation in the lap symbol aligned.
In the present invention, the symbol aligned of indication comprises whole symbol aligned and half symbol aligned.
Due in ADAPTIVE MIXED HARQ HARQ transmission mode, the length of each HARQ data sub-packets is relevant with the value of the number of subchannels of HARQ data sub-packets with the value of order of modulation.And because the data sub-packets number of subchannels of each transmission may be changed by various factors, so the order of modulation of each transmission and the length of HARQ attached bag all may change.But, adopt the data sub-packets of identical order of modulation modulation in the situation that the start position symbol aligned, because the present invention limits the length in circular buffer district, make the data sub-packets that guarantees to transmit under identical modulating mode when overlapping, lap is-symbol or half symbol or every two symbol aligned, can avoid because symbol does not line up the problem that the HARQ retransmission performance that causes descends, thereby improve the performance of link, the complexity that the reduction system realizes.
Be illustrated in figure 6 as the structure chart of rate matching apparatus provided by the invention, this rate matching apparatus comprises:
Interleaver, being used for to interweave to the sequences of code bits after the information bit sequence chnnel coding obtains female code code word; The length determining unit is for the length N of determining the circular buffer district
FB_BufferBe the integral multiple of predetermined value, make when repeatedly transmitting, adopt the data sub-packets lap symbol aligned of identical order of modulation modulation; The circular buffer district is used for storing the N of described female code code word
FB_BufferIndividual bit; Rate matchers is used for selecting one section female code code word to produce data sub-packets from the circular buffer district, the length of this data sub-packets with distribute the size of physical channel resources to be complementary.
In embodiments of the invention one, speed matching method of the present invention comprises the following steps:
S201, will interweave to the sequences of code bits after the information bit sequence chnnel coding obtains female code code word.
S202, the length N in determined circular buffer district in the present embodiment
FB_Buffer=N*Nmod, the order of modulation that adopts when wherein Nmod represents to modulate, N is positive integer.
S203 is with the N of female code code word
FB_BufferBit leaves in described circular buffer district successively;
S204 selects one section female code code word to produce data sub-packets (HARQ attached bag) from the circular buffer district, the length of HARQ attached bag with distribute the size of physical channel resources to be complementary.The length of the HARQ attached bag of transmitting in the present embodiment is the even-multiple of order of modulation Nmod.Certainly, the length of HARQ attached bag can be also integral multiple or other value of order of modulation Nmod.
The wherein original position in the circular buffer district and the length of HARQ attached bag according to the HARQ attached bag select bit to produce the HARQ attached bag of current transmission from the circular buffer district.Selecting from the circular buffer district during bit forms the process of HARQ attached bag, with the initial bits in the circular buffer district next bit as last bit in circular buffer district.
Illustrate as follows: suppose that the transmission for the first time of HARQ attached bag and the SPID value that retransmits for the first time are 0,1.Transmission for the first time and the HARQ attached bag that retransmits are for the first time provided by following mode:
Be N from length
FB_BufferThe original position in circular buffer district rise select before L1 bit form the HARQ attached bag of transmission for the first time, wherein, L1 is the length of the HARQ attached bag transmitted for the first time.
Be N from length
FB_BufferThe circular buffer district in select last L2 bit to form the HARQ attached bag that retransmits for the first time, wherein, L2 is the length of the HARQ attached bag of re-transmission for the first time.
For example, a length being arranged is the information bit sequence of 4800 bits; The order of modulation Nmod of the HARQ attached bag of twice transmission is 6; The length N in current circular buffer district
FB_BufferBe 9000 bits (being that Nmod is 6 integral multiple); The length L 1 of the HARQ attached bag of transmission is 6000 bits (being that Nmod is 6 even-multiple) for the first time, and the length L 2 of the HARQ attached bag that retransmits for the first time is 7248 bits (being that Nmod is 6 even-multiple).
Wherein, bit index is since 0, and the modulation symbol index is since 0.
As mentioned above, information bit sequence a0, a1 ..., the female yard code word that a4799} obtains through coding with after interweaving put into length N
FB_BufferBe in the circular buffer district of 9000 bits, obtain circular buffer district data for b0, b1 ..., b8999}.For the first time the transmission HARQ attached bag data be b0, b1 ..., b5999}, for the first time the re-transmission HARQ attached bag data be b1752, b1753 ..., b8999}.
So for the first time the lap of HARQ attached bag of the HARQ attached bag of transmission and re-transmission for the first time be b1752, b1753 ..., b5999}.Being the initial bits of the 292nd modulation symbol of the HARQ attached bag transmitted for the first time due to lap start position symbol b1752, is again the initial bits of the 0th modulation symbol of the HARQ attached bag that retransmits for the first time.As seen, owing to adopting identical order of modulation, in this twice transmission, the HARQ attached bag is whole symbol aligned at lap.
Two transmission attached bags that Fig. 7 has provided the present embodiment overlap but the annular schematic diagram of symbol aligned.
Therefore, speed matching method in the present embodiment, can farthest guarantee to transmit attached bag when overlapping, lap aligns by modulation symbol, can avoid because modulation symbol does not line up the problem that the HARQ retransmission performance that causes descends or increases system's implementation complexity.
In embodiments of the invention two, speed matching method of the present invention comprises the following steps:
S301, will interweave to the sequences of code bits after the information bit sequence chnnel coding obtains female code code word.
S302 determines the length N in circular buffer district
FB_Buffer=N*Nmod/2, wherein Nmod represents a kind of order of modulation, N is positive integer.
S303 is with the N of described female code code word
FB_BufferIndividual bit leaves in the circular buffer district successively;
S304 selects one section female code code word to produce data sub-packets (HARQ attached bag) from the circular buffer district, the length of this HARQ attached bag with distribute the size of physical channel resources to be complementary.The length of the HARQ attached bag of transmitting in the present embodiment is the even-multiple of order of modulation Nmod.
The wherein original position in the circular buffer district and the length of HARQ attached bag according to the HARQ attached bag select bit to produce the HARQ attached bag of current transmission from the circular buffer district.Selecting from the circular buffer district during bit forms the process of HARQ attached bag, with the initial bits in the circular buffer district next bit as last bit in circular buffer district.
Illustrate as follows: suppose that the transmission for the first time of HARQ attached bag and the SPID value that retransmits for the first time are 0,1.Transmission for the first time and the HARQ attached bag that retransmits are for the first time provided by following mode:
Be N from length
FB_BufferThe original position in circular buffer district rise select before L1 bit form the HARQ attached bag of transmission for the first time, wherein, L1 is the length of the HARQ attached bag transmitted for the first time.
Be N from length
FB_BufferThe circular buffer district in select last L2 bit to form the HARQ attached bag that retransmits for the first time, wherein, L2 is the length of the HARQ attached bag of re-transmission for the first time.
Wherein, bit index is since 0, and the modulation symbol index is since 0.
For example, a length being arranged is the information bit sequence of 912 bits; The order of modulation Nmod of current HARQ attached bag is 6; The length N in current circular buffer district
FB_BufferBe 2403 bits (being that Nmod/2 is 3 integral multiple); The length L 1 of the HARQ attached bag of transmission is 1500 bits (being that Nmod is 6 even-multiple) for the first time, and the length L 2 of the HARQ attached bag that retransmits for the first time is that 1800 bits are that Nmod is 6 even-multiple).
As mentioned above, information bit sequence a0, a1 ..., the female yard code word that a911} obtains through coding with after interweaving put into length N
FB_BufferBe in the circular buffer district of 2403 bits, obtain circular buffer district data for b0, b1 ..., b2402}.For the first time the transmission HARQ attached bag data be b0, b1 ..., b1499}, for the first time the re-transmission HARQ attached bag data be b603, b604 ..., b2402}.
So for the first time the lap of HARQ attached bag of the HARQ attached bag of transmission and re-transmission for the first time be b603, b604 ..., b1499}.Being the initial bits of the rear half symbols in the 100th symbol of the HARQ attached bag transmitted for the first time due to lap start position symbol b603, is again the initial bits of the 0th symbol of the HARQ attached bag that retransmits for the first time.As seen, in the situation that two transmission attached bags adopt identical order of modulation, the lap of these two transmission attached bags is half symbol aligned.
Two transmission attached bags that Fig. 8 provides the present embodiment overlap but the annular schematic diagram of half symbol aligned.
Therefore, speed matching method in the present embodiment, can farthest guarantee to transmit attached bag when overlapping, lap is half modulation symbol alignment, can avoid because half modulation symbol does not line up the problem that the HARQ retransmission performance that causes descends or increases system's implementation complexity.
According to embodiments of the invention three, speed matching method of the present invention comprises the following steps:
S401, will interweave to the sequences of code bits after the information bit sequence chnnel coding obtains female code code word.
S402 determines the length N in circular buffer district
FB_BufferIntegral multiple for the least common multiple of multiple different modulating exponent number.Be N
FB_Buffer(Nmod 1 for=N*lcm, Nmod 2, ..., Nmod n), wherein Nmod 1, Nmod 2, ..., Nmod n represent respectively the first order of modulation, the second order of modulation ..., n kind order of modulation, n represents the number of different order of modulation, lcm () expression is asked least common multiple to the number in bracket, and N is positive integer.Can pre-determine the modulation of adopting at the retransmission modulation of makeing mistakes before carrying out transfer of data, be a plurality of in order of modulation, adopts this method to determine the length in circular buffer district.
S403 is with the N of described female code code word
FB_BufferIndividual bit leaves in the circular buffer district successively
S404 selects one section female code code word to produce data sub-packets (HARQ attached bag) from the circular buffer district, the length of this HARQ attached bag with distribute the size of physical channel resources to be complementary.The length of the HARQ attached bag of transmitting in the present embodiment is the even-multiple of order of modulation Nmod.
Original position according to the HARQ attached bag in the circular buffer district and the length of HARQ attached bag select bit to produce the HARQ attached bag of current transmission from the circular buffer district.Selecting from the circular buffer district during bit forms the process of HARQ attached bag, with the initial bits in the circular buffer district next bit as last bit in circular buffer district.
Illustrate as follows: the transmission for the first time of hypothesis HARQ attached bag in the present embodiment, the SPID value that retransmits for the first time and retransmit for the second time is respectively 0,1,3.Transmission for the first time, the HARQ attached bag that retransmits for the first time and retransmit is for the second time provided by following mode:
Be N from length
FB_BufferThe original position in circular buffer district rise select before L1 bit form the HARQ attached bag of transmission for the first time, wherein, L1 is the length of the HARQ attached bag transmitted for the first time.
Be N from length
FB_BufferThe circular buffer district in select last L2 bit to form the HARQ attached bag that retransmits for the second time, wherein, L2 is the length of the HARQ attached bag of re-transmission for the second time.
Take length as N
FB_BufferLast bit position in circular buffer district centered by the position select L3 bit to form to retransmit for the first time the HARQ attached bag, that is, last bit of circular buffer district is the center of attached bag, L3 is the length of the HARQ attached bag of re-transmission for the first time.
Wherein, bit index is since 0, and the modulation symbol index is since 0.
For example, a length being arranged is the information bit sequence of 1800 bits; Suppose transmission for the first time, the order of modulation of the HARQ attached bag that retransmits for the first time and retransmit for the second time is respectively 6,4,4; The length N in current circular buffer district
FB_BufferBe 4824 bits (be 6,4,4 least common multiple is 12 integral multiple); The length L 1 of the HARQ attached bag of transmission is 2652 bits (being that Nmod is 6 even-multiple) for the first time, the length L 2 of the HARQ attached bag that retransmits for the first time is 3664 bits (being that Nmod is 4 even-multiple), and the length L 3 of the HARQ attached bag that retransmits for the second time is 3240 bits (being that Nmod is 4 even-multiple).
As mentioned above, information bit sequence a0, a1 ..., the female yard code word that a1799} obtains through coding with after interweaving put into length N
FB_BufferBe in the circular buffer district of 4824 bits, obtain circular buffer district data for b0, b1 ..., b4823}.For the first time the transmission HARQ attached bag data be b0, b1 ..., b2651}, for the first time the re-transmission HARQ attached bag data be { b1160, b1161, ..., b4823}, the HARQ attached bag data that retransmit for the second time be b3204, and b3205 ..., b4823, b0, b1 ..., b1619}.
So the lap of the HARQ attached bag that adopts the HARQ attached bag that retransmits for the first time of identical order of modulation and retransmit for the second time be b3204 ..., and b4823} with b1160 ..., b1619}.It is respectively the initial bits that retransmits for the first time the 0th modulation symbol of HARQ attached bag due to b1160, it is again the initial bits that retransmits for the second time the 695th modulation symbol of HARQ attached bag, shown in twice transmission attached bag lap b3204 ..., b4823} start position symbol aligned; Simultaneously, being respectively the initial bits that retransmits for the second time the 0th modulation symbol of HARQ attached bag due to b3204, is again the initial bits that retransmits for the first time the 511st modulation symbol of HARQ attached bag, shown in the attached bag of twice transmission at lap { b1160, ..., b1619} start position symbol aligned.As seen, the HARQ attached bag lap of this twice transmission aligns by modulation symbol.
Two transmission attached bags that Fig. 9 has provided the present embodiment overlap but the annular schematic diagram of symbol aligned.
Therefore, speed matching method in the present embodiment, can farthest guarantee to transmit attached bag when overlapping, lap can be avoided because modulation symbol does not line up the problem that the HARQ retransmission performance that causes descends or increases system's implementation complexity by the modulation alignment.
According to embodiments of the invention four, speed matching method of the present invention comprises the following steps:
S501, will interweave to the sequences of code bits after the information bit sequence chnnel coding obtains female code code word.
S502, the length in definite circular buffer district is the integral multiple of byte length.Be N
FB_Buffer=N*8, N are positive integer.
S503 is with the N of described female code code word
FB_BufferIndividual bit leaves in the circular buffer district successively.
S504 selects one section female code code word to produce data sub-packets with the circulation selection mode from the circular buffer district, the length of this data sub-packets with distribute the size of physical channel resources to be complementary.The length of the HARQ attached bag of transmitting in the present embodiment is the even-multiple of order of modulation Nmod.
Original position according to the HARQ attached bag in the circular buffer district and the length of HARQ attached bag select bit to produce the HARQ attached bag of current transmission from the circular buffer district.Selecting from the circular buffer district during bit forms the process of HARQ attached bag, with the initial bits in the circular buffer district next bit as last bit in circular buffer district.
Illustrate as follows: suppose that the transmission for the first time of HARQ attached bag and the SPID value that retransmits for the first time are 0,1.Transmission for the first time and the HARQ attached bag that retransmits are for the first time provided by following mode:
Be N from length
FB_BufferThe original position in circular buffer district rise select before L1 bit form the HARQ attached bag of transmission for the first time, wherein, L1 is the length of the HARQ attached bag transmitted for the first time.
Be N from length
FB_BufferThe circular buffer district in, the L0 bit in the buffer memory selects L2 bit to form the HARQ attached bag that retransmits for the first time as the attached bag original position, wherein, L2 be the length of the HARQ attached bag of re-transmission for the first time.
Wherein, bit index is since 0, and the modulation symbol index is since 0.
For example, a length being arranged is the information bit sequence of 720 bits; The order of modulation Nmod of HARQ attached bag is 4 (integral multiples of the Nmod that adopts when byte length is modulation); The length N in current circular buffer district
FB_BufferBe 2000 bits (are 8 integral multiple); The length L 1 of the HARQ attached bag of transmission is 1424 bits (being that Nmod is 4 even-multiple) for the first time, and the length L 2 of the HARQ attached bag that retransmits for the first time is 1568 bits (being that Nmod is 4 even-multiple).
As mentioned above, information bit sequence a0, a1 ..., the female yard code word that a720} obtains through coding with after interweaving put into length N
FB_BufferBe in the circular buffer district of 2000 bits, obtain circular buffer district data for b0, b1 ..., b1999}.For the first time the transmission HARQ attached bag data be b0, b1 ..., b1423}, for the first time the re-transmission HARQ attached bag data be b1424, b1425 ..., b1999, b0, b1 ..., b991}.
So for the first time the lap of HARQ attached bag of the HARQ attached bag of transmission and re-transmission for the first time be b0, b1 ..., b991}.Because b0 is the initial bits of the 0th modulation symbol of transmitting HARQ attached bag for the first time, it is again the initial bits that retransmits for the first time the 576th modulation symbol of HARQ attached bag.As seen, in the situation that adopt identical order of modulation, the lap is-symbol alignment of these two transmission attached bags.
Two transmission attached bags that Figure 10 has provided the present embodiment overlap but the annular schematic diagram of symbol aligned.
Therefore, speed matching method in the present embodiment, can farthest guarantee to transmit attached bag when overlapping, lap is-symbol or half symbol aligned, can avoid not lining up or half symbol does not line up the problem that the HARQ retransmission performance that causes descends or increases system's implementation complexity due to modulation symbol.
According to embodiments of the invention five, speed matching method of the present invention comprises the following steps:
S601, will interweave to the sequences of code bits after the information bit sequence chnnel coding obtains female code code word.
S602 determines the length N in circular buffer district
FB_BufferBe the integral multiple of the least common multiple of the order of modulation that adopts in byte length and when modulation.Be N
FB_Buffer=N*lcm (Nmod, 8), wherein Nmod represents a kind of order of modulation, bit number that byte is contained of 8 expressions, lcm () expression is asked least common multiple to the number in bracket, and N is positive integer.
S603 is with the N of described female code code word
FB_BufferIndividual bit leaves in the circular buffer district successively.
S604 selects one section female code code word to produce data sub-packets from the circular buffer district, the length of this data sub-packets with distribute the size of physical channel resources to be complementary.The length of the HARQ attached bag of transmitting in the present embodiment is the even-multiple of order of modulation Nmod.
The wherein original position in the circular buffer district and the length of HARQ attached bag according to the HARQ attached bag select bit to produce the HARQ attached bag of current transmission from the circular buffer district.Selecting from the circular buffer district during bit forms the process of HARQ attached bag, with the initial bits in the circular buffer district next bit as last bit in circular buffer district.
Illustrate as follows: suppose that the transmission for the first time of HARQ attached bag and the SPID value that retransmits for the first time are 0,3.Transmission for the first time and the HARQ attached bag that retransmits are for the first time provided by following mode:
Be N from length
FB_BufferThe original position in circular buffer district rise select before L1 bit form the HARQ attached bag of transmission for the first time, wherein, L1 is the length of the HARQ attached bag transmitted for the first time.Take length as N
FB_BufferLast bit position in circular buffer district centered by the position select L2 bit to form to retransmit for the first time the HARQ attached bag, wherein, L2 is the length of the HARQ attached bag of re-transmission for the first time.
Wherein, bit index is since 0, and the modulation symbol index is since 0.
For example, a length being arranged is the information bit sequence of 1024 bits; The order of modulation Nmod of current HARQ attached bag is 6; The length N in current circular buffer district
FB_BufferBe 2856 bits (being that 6,8 least common multiple is 24 integral multiple); The length L 1 of the HARQ attached bag of transmission is 1728 bits (being that Nmod is 6 even-multiple) for the first time, and the length L 2 of the HARQ attached bag that retransmits for the first time is 2304 bits (being that Nmod is 6 even-multiple).
As mentioned above, information bit sequence a0, a1 ..., the female yard code word that a1023} obtains through coding with after interweaving put into length N
FB_BufferBe in the circular buffer district of 2856 bits, obtain circular buffer district data for b0, b1 ..., b2855}.For the first time the transmission HARQ attached bag data be b0, b1 ..., b1727}, for the first time the re-transmission HARQ attached bag data be b1704, b1705 ..., b2855, b0, b1 ..., b1151}.
So for the first time the lap of the HARQ attached bag of transmission and the HARQ attached bag that retransmits for the first time be b1704, b1705 ..., b1727} with b0, b1 ..., b1151}.Being the initial bits of the 0th modulation symbol transmitting for the first time due to b0, is again the initial bits of the 192nd modulation symbol retransmitting for the first time; And b1704 is the initial bits of the 284th modulation symbol transmitting for the first time, is again the initial bits of the 0th modulation symbol retransmitting for the first time.So the alignment of the lap is-symbol of the data sub-packets of this twice transmission.
Two transmission attached bags that Figure 11 has provided the present embodiment overlap but the annular schematic diagram of symbol aligned.
Therefore, speed matching method in the present embodiment, can farthest guarantee to transmit attached bag when overlapping, the alignment of lap is-symbol, can avoid because modulation symbol does not line up the problem that the HARQ retransmission performance that causes descends or increases system's implementation complexity.
According to embodiments of the invention six, speed matching method of the present invention comprises the following steps:
S701, will interweave to the sequences of code bits after the information bit sequence chnnel coding obtains female code code word.
S702 determines that the length in circular buffer district is the integral multiple of the least common multiple of multiple different modulating exponent number and byte length.Be N
FB_Buffer=N*lcm (Nmod 1, and Nmod 2 ..., Nmod n, 8), wherein Nmod 1, and Nmod 2, ..., Nmod n represent the first order of modulation, the second order of modulation ..., n kind order of modulation, n represents the number of different order of modulation, bit number that byte is contained of 8 expressions, lcm () expression is asked least common multiple to the number in bracket, and N is integer.
S703 is with the N of described female code code word
FB_BufferIndividual bit leaves in the circular buffer district successively.
S704 selects one section female code code word to produce data sub-packets from the circular buffer district, the length of this data sub-packets with distribute the size of physical channel resources to be complementary.The length of the HARQ attached bag of transmitting in the present embodiment is the even-multiple of order of modulation Nmod.
Original position according to the HARQ attached bag in the circular buffer district and the length of HARQ attached bag select bit to produce the HARQ attached bag of current transmission from the circular buffer district.Selecting from the circular buffer district during bit forms the process of HARQ attached bag, with the initial bits in the circular buffer district next bit as last bit in circular buffer district.
Illustrate as follows: suppose that the transmission for the first time of HARQ attached bag, the SPID value that retransmits and retransmit for the second time for the first time are respectively 0,1,3.Transmission for the first time, the HARQ attached bag that retransmits for the first time and retransmit is for the second time provided by following mode:
Be N from length
FB_BufferThe original position in circular buffer district rise select before L1 bit form the HARQ attached bag of transmission for the first time, wherein, L1 is the length of the HARQ attached bag transmitted for the first time.
Be N from length
FB_BufferThe circular buffer district in select last L2 bit to form the HARQ attached bag that retransmits for the first time, wherein, L2 is the length of the HARQ attached bag of re-transmission for the first time.
Take length as N
FB_BufferLast bit position in circular buffer district centered by the position select L3 bit to form to retransmit for the second time the HARQ attached bag, wherein, L3 is the length of the HARQ attached bag of re-transmission for the second time.
Wherein, bit index is since 0, and the modulation symbol index is since 0.
For example, a length being arranged is the information bit sequence of 1160 bits; Transmission for the first time, the order of modulation of the HARQ attached bag that retransmits for the first time and retransmit for the second time is respectively 6,4,6; The length N in current circular buffer district
FB_BufferBe 3000 bits (being 6,4, the integral multiple of 8 least common multiple 24); The length L 1 of the HARQ attached bag of transmission is 1860 bits (being that order of modulation Nmod is 6 even-multiple) for the first time, the length L 2 of the HARQ attached bag that retransmits for the first time is 2400 bits (being that order of modulation Nmod is 4 even-multiple), and the length L 3 of the HARQ attached bag that retransmits for the second time is 1920 bits (being that order of modulation Nmod is 6 even-multiple).
As mentioned above, information bit sequence a0, a1 ..., the female yard code word that a1159} obtains through coding with after interweaving put into length N
FB_BufferBe in the circular buffer district of 3000 bits, obtain circular buffer district data for b0, b1 ..., b2999}.For the first time the HARQ attached bag data of transmission be b0, b1 ..., b1859}, the HARQ attached bag data that retransmit for the first time be b600, b601 ..., b2999}, for the second time the HARQ attached bag data of re-transmission be b2040, b2041 ..., b2999, b0, b1 ..., b959}.
So for the first time the lap of HARQ attached bag of the HARQ attached bag of transmission and re-transmission for the second time be b0, b1 ..., b959}.Because b0 is the initial bits of the 0th modulation symbol of transmitting HARQ attached bag for the first time, it is again the initial bits that retransmits for the second time the 160th modulation symbol of HARQ attached bag.As seen, the lap is-symbol of transmission for the first time and the HARQ attached bag that retransmits is for the second time alignd.
Two transmission attached bags that Figure 12 has provided the present embodiment overlap but the annular schematic diagram of symbol aligned.
Therefore, speed matching method in the present embodiment, can farthest guarantee to transmit attached bag when overlapping, lap can be avoided because modulation symbol does not line up the problem that the HARQ retransmission performance that causes descends or increases system's implementation complexity by the modulation symbol alignment.
According to embodiments of the invention seven, speed matching method of the present invention comprises the following steps:
S801, will interweave to the sequences of code bits after the information bit sequence chnnel coding obtains female code code word.
S802 determines the length N in circular buffer district
FB_BufferIntegral multiple for the length N ep of information bit sequence.Be N
FB_Buffer=N*Nep, wherein Nep represents the length of an information bit sequence, N is positive integer.
S803 is with the N of described female code code word
FB_BufferIndividual bit leaves in the circular buffer district successively.
S804 selects one section female code code word to produce data sub-packets from the circular buffer district, the length of this data sub-packets with distribute the size of physical channel resources to be complementary.The length of the HARQ attached bag of transmitting in the present embodiment is the even-multiple of order of modulation Nmod.
Original position according to the HARQ attached bag in the circular buffer district and the length of HARQ attached bag select bit to produce the HARQ attached bag of current transmission from the circular buffer district.Selecting from the circular buffer district during bit forms the process of HARQ attached bag, with the initial bits in the circular buffer district next bit as last bit in circular buffer district.
Illustrate as follows: suppose that the transmission for the first time of HARQ attached bag and the SPID value that retransmits for the first time are 0,2.Suppose that transmission for the first time and the HARQ attached bag that retransmits are for the first time provided by following mode:
Be N from length
FB_BufferThe original position in circular buffer district rise select before L1 bit form the HARQ attached bag of transmission for the first time, wherein, L1 is the length of the HARQ attached bag transmitted for the first time.
Take length as N
FB_BufferCentre position, circular buffer district be that the center of the HARQ attached bag that retransmits for the first time selects L2 bit to form the HARQ attached bag, L2 is the length of the HARQ attached bag of re-transmission for the first time.
Wherein, bit index is since 0, and the modulation symbol index is since 0.
For example, the order of modulation Nmod of HARQ attached bag is 6; It is the information bit sequence of 960 (being that order of modulation Nmod is 6 integral multiple) bit that a length is arranged; The length N in current circular buffer district
FB_BufferBe 2880 bits (being the integral multiple of information bit sequence length 960); The length L 1 of the HARQ attached bag of transmission is 1212 bits (length is that Nmod is 6 even-multiple) for the first time, and the length L 2 of the HARQ attached bag that retransmits for the first time is 1656 bits (length is that Nmod is 6 even-multiple).
As mentioned above, information bit sequence a0, a1 ..., the female yard code word that a959} obtains through coding with after interweaving put into length N
EB_BufferBe in the circular buffer district of 2880 bits, obtain circular buffer district data for b0, b1 ..., b2779}.For the first time the transmission HARQ attached bag data be b0, b1 ..., b1211}, for the first time the re-transmission HARQ attached bag data be b612, b613 ..., b2267}.
So for the first time the lap of HARQ attached bag of the HARQ attached bag of transmission and re-transmission for the first time be b612, b613 ..., b1211}.Because b612 is the initial bits of the 102nd modulation symbol of transmitting HARQ attached bag for the first time, it is again the initial bits that retransmits for the first time the 0th symbol of HARQ attached bag.As seen, the lap is-symbol of these two transmission attached bags is alignd.
Two transmission attached bags that Figure 13 has provided the present embodiment overlap but the annular schematic diagram of symbol aligned.
Further, the length of described female code code word is the integral multiple of information bit sequence length, and the length in determined circular buffer district is identical with the length of described female yard code word.For example in 1/3 encoder bit rate situation, the length N of circular buffer
FB_BufferBe 3 times of information code length,
Therefore, speed matching method in the present embodiment, can farthest guarantee to transmit attached bag when overlapping, lap can be avoided because modulation symbol does not line up the problem that the HARQ retransmission performance that causes descends or increases system's implementation complexity by the modulation symbol alignment.
According to embodiments of the invention eight, speed matching method of the present invention comprises the following steps:
S901, to interweave to the sequences of code bits after the information bit sequence chnnel coding obtains female code code word, and it is one of following that the mode that information bit sequence is encoded comprises: the turbo code, adopt the Turbo coding when stinging tail turbo code, low density parity check code chnnel coding.
S902, the length of determining the circular buffer district is half the integral multiple of least common multiple of multiple different modulating exponent number.Be N
FB_Buffer((Nmod 1 for lcm for=N*, Nmod 2, ..., Nmod n)/2), wherein Nmod 1, Nmod 2, ..., Nmod n represent respectively the first order of modulation, the second order of modulation ...., n kind order of modulation, n represents the number of different order of modulation, lcm () expression is asked least common multiple to the number in bracket, and N is positive integer.
S903 is with the N of described female code code word
FB_BufferIndividual bit leaves in the circular buffer district successively.
S903 selects one section female code code word to produce data sub-packets with the circulation selection mode from the circular buffer district, the length of this data sub-packets with distribute the size of physical channel resources to be complementary.Wherein, the data in the circular buffer district comprise systematic bits part and check bit part.The length of the HARQ attached bag of transmitting in the present embodiment is the even-multiple of order of modulation Nmod.
Original position according to the HARQ attached bag in the circular buffer district and the length of HARQ attached bag select bit to produce the HARQ attached bag of current transmission from the circular buffer district.Selecting from the circular buffer district during bit forms the process of HARQ attached bag, with the initial bits in the circular buffer district next bit as last bit in circular buffer district.
Illustrate as follows: suppose the transmission for the first time of HARQ attached bag, the SPID value that retransmits for the first time and retransmit for the second time is respectively 0,1,3.Transmission for the first time, the HARQ attached bag that retransmits for the first time and retransmit is for the second time provided by following mode:
Be N from length
FB_BufferThe original position in circular buffer district rise select before L1 bit form the HARQ attached bag of transmission for the first time, wherein, L1 is the length of the HARQ attached bag transmitted for the first time.
Be N from length
FB_BufferThe circular buffer district in select last L2 bit to form the HARQ attached bag that retransmits for the first time, wherein, L2 is the length of the HARQ attached bag of re-transmission for the first time.
Take length as N
FB_BufferLast bit position in circular buffer district centered by the position select L3 bit to form to retransmit for the second time the HARQ attached bag, L3 retransmits the length of HARQ attached bag for the second time.
Wherein, bit index is since 0, and the modulation symbol index is since 0.
For example, a length being arranged is the information bit sequence of 1552 bits; Suppose transmission for the first time, the order of modulation of the HARQ attached bag that retransmits for the first time and retransmit for the second time is respectively 6,4,4; The length N in current circular buffer district
FB_BufferBe 3672 bits (are half integral multiple of 6,4,4 least common multiple, also i.e. 6 integral multiple); The length L 1 of the HARQ attached bag of transmission is 1920 bits (being that Nmod is 6 even-multiple) for the first time, the length L 2 of the HARQ attached bag that retransmits for the first time is 2648 bits (being that Nmod is 4 even-multiple), and the length L 3 of the HARQ attached bag that retransmits for the second time is 2400 bits (being that Nmod is 4 even-multiple).
As mentioned above, information bit sequence a0, a1 ..., the female yard code word that a1551} obtains through coding with after interweaving put into length N
FB_BufferBe in the circular buffer district of 3672 bits, obtain circular buffer district data for b0, b1 ..., b3671}.For the first time the transmission HARQ attached bag data be b0, b1 ..., b1919}, for the first time the re-transmission HARQ attached bag data be { b1024, b1025, ..., b3671}, the HARQ attached bag data that retransmit for the second time be b2472, and b2473 ..., b3671, b0, b1 ..., b1199}.
So the lap of the HARQ attached bag that retransmits for the first time and the HARQ attached bag that retransmits for the second time be b1024, b1025 ..., b1199} with b2472, b2473 ..., b3671}.Being respectively the initial bits that retransmits for the first time the 0th modulation symbol of HARQ attached bag due to b1024, is again the initial bits that retransmits for the second time the 556th modulation symbol of HARQ attached bag; And b2472 is respectively the initial bits that retransmits for the first time the 362nd modulation symbol of HARQ attached bag, is again the initial bits that retransmits for the second time the 0th modulation symbol of HARQ attached bag.As seen, the lap is-symbol of these two transmission attached bags is alignd.
Two transmission attached bags that Figure 14 has provided the present embodiment overlap but the annular schematic diagram of symbol aligned.
Therefore, speed matching method in the present embodiment, can farthest guarantee to transmit attached bag when overlapping, lap is by modulation symbol alignment, can avoid not lining up or half modulation symbol does not line up the problem that the HARQ retransmission performance that causes descends or increases system's implementation complexity due to modulation symbol.
Further, the length N of circular buffer
FB_BufferCan be the length take soft bit information as unit, namely comprise N in circular buffer
FB_BufferIndividual soft bit information;
Further, the length N of circular buffer
FB_BufferRefer to actual use in HARQ transmission, the buffer storage length take soft bit information as unit.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of claim of the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (3)
1. a speed matching method, is characterized in that, the method comprising the steps of:
To interweave to the sequences of code bits after the information bit sequence chnnel coding and obtain female code code word;
Determine the length N in circular buffer district
FB_BufferBe the integral multiple of predetermined value, make when repeatedly transmitting the lap symbol aligned; Described symbol aligned be same bits when repeatedly transmitting the position in modulation symbol identical;
N with described female code code word
FB_BufferIndividual bit leaves in the circular buffer district successively;
Select one section female code code word to produce data sub-packets from the circular buffer district, the length of this data sub-packets with distribute the size of physical channel resources to be complementary;
Described predetermined value is half of order of modulation or order of modulation; Or,
Described predetermined value is the least common multiple of multiple different modulating exponent number, or is half of least common multiple of multiple different modulating exponent number; Or
Described predetermined value is the length of information bit sequence; Or,
Described predetermined value is byte length; Or,
Described predetermined value is the least common multiple of byte length and order of modulation; Or,
Described predetermined value is the least common multiple of multiple different modulating exponent number and byte length.
2. the method for claim 1, is characterized in that,
The length in described circular buffer district is the length take soft bit information as unit.
3. a rate matching apparatus, is characterized in that, this device comprises:
Interleaver, being used for to interweave to the sequences of code bits after the information bit sequence chnnel coding obtains female code code word;
The length determining unit is for the length N of determining the circular buffer district
FB_BufferBe the integral multiple of predetermined value, make when repeatedly transmitting the lap symbol aligned; Described symbol aligned be same bits when repeatedly transmitting the position in modulation symbol identical;
The circular buffer district is used for storing the N of described female code code word
FB_BufferIndividual bit;
Rate matchers is used for selecting one section female code code word to produce data sub-packets from the circular buffer district, the length of this data sub-packets with distribute the size of physical channel resources to be complementary;
Described predetermined value is half of order of modulation or order of modulation; Or,
Described predetermined value is the least common multiple of multiple different modulating exponent number, or is half of least common multiple of multiple different modulating exponent number; Or
Described predetermined value is the length of information bit sequence; Or,
Described predetermined value is byte length; Or,
Described predetermined value is the least common multiple of byte length and order of modulation; Or,
Described predetermined value is the least common multiple of multiple different modulating exponent number and byte length.
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