CN101369865B - Method of configuring transmission in mobile communication system - Google Patents
Method of configuring transmission in mobile communication system Download PDFInfo
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- CN101369865B CN101369865B CN2008101459476A CN200810145947A CN101369865B CN 101369865 B CN101369865 B CN 101369865B CN 2008101459476 A CN2008101459476 A CN 2008101459476A CN 200810145947 A CN200810145947 A CN 200810145947A CN 101369865 B CN101369865 B CN 101369865B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/63—Joint error correction and other techniques
- H03M13/635—Error control coding in combination with rate matching
- H03M13/6362—Error control coding in combination with rate matching by puncturing
- H03M13/6368—Error control coding in combination with rate matching by puncturing using rate compatible puncturing or complementary puncturing
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
- H03M13/2778—Interleaver using block-wise interleaving, e.g. the interleaving matrix is sub-divided into sub-matrices and the permutation is performed in blocks of sub-matrices
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Abstract
The invention relates to a method for configuring a transmission chain in a 3GPP2 system for supporting a flexible or variable data rate of an information bitstream in a process for mapping an information bitstream of a data rate on a physical layer, including the steps of (1) channel coding the information bitstreams with bit rates different from each other into turbo codes or convolution codes having a value inverse of 1/coding rate, and (2) repeating coded bitstream when the channel coded bitstream is smaller than a desired interleaving size, and puncturing the coded bitstream when the channel coded bitstream is greater than the desired interleaving size, for matching the channel coded bitstream to the interleaving size.
Description
Technical field
The present invention relates to the 3GPP2 system, relate more specifically in the 3GPP2 system, dispose the method for chain (transmission chain) with the information bit stream of support elasticity or variable-data-rate (flexible or variabledata rate).
Background technology
Usually, 3GPP2 (third generation cooperation part 2) system has two transmission modes beyond the routine data rate mode, i.e. elastic data rate mode and variable data rate mode.The routine data rate mode is the transmission mode that is operated on the fixedly chain that is called radio configuration (RC).RC represents a kind of chain, wherein is provided with identically with formation standard with length from the output bit stream of channel encoder information data, channel interleaver according to the encoding rate of chnnel coding.In the case, in channel interleaver size, channel encoder encoding rate and channel walsh code length, the certain standard criterion is arranged.That is, in case the spreading rate that uses is fixed, the needed number of chips of modulated symbol will be fixing according to the channel interleaver size, and the channel interleaver size can be defined as flare factor.According to the fixing length that can make different channels carry out the multiplexing walsh code of sign indicating number of flare factor.Can use the quantity of walsh code to be directly proportional with walsh code length.Therefore, the open ended channel quantity of multipling channel changes with walsh code.
Suppose that it is equal length that the experience chnnel coding is handled the length of back input information bit stream.In the case, the encoding rate of channel encoder is low more, and the error correcting ability of proofreading and correct the possibility error code in channel is strong more.That is, the encoding rate of channel encoder is low more, and error correcting capability is strong more.This allows to use lower through-put power.
, use the channel encoder of low encoding rate to prolong the output bit stream of channel encoder, this so that strengthened the size of channel interleaver.This has finally increased modulated symbol speed, and has reduced needed number of chips of modulated symbol when fixing spreading rate, and has reduced the quantity of useful walsh code.On the contrary, if the high channel encoding rate is applied to the incoming bit stream of the channel encoder of equal length, the output bit stream length of channel encoder shortens, even error correcting capability is low.This has reduced modulated symbol speed, allows to use the short channel interleaver, has increased the quantity that can use walsh code.
According to the above description, very clearly exist certain compromise between at interval at channel encoder encoding rate and walsh code.RC is standardized chain, and maybe it is useful when need be than low transmission power at interval when preferred assurance walsh code.In the 3GPP2 system, the current 3X system that has 1X system that several standardization RC are used for the 1.2288Mcps spreading rate and several standardization RC to be used for the 3.686Mcps spreading rate.Should be noted that input data rate that limits among each RC and interleaver size also have the form of secondary power because flare factor has the numerical value with the secondary power form.
Before forming channel between mobile radio station and the base station, mobile radio station and base station come to determine the RC of use and the flare factor on the RC through consultation, that is, the channel interleaver size is used to handle and chain mates communicates by letter.In pattern, use elastic data rate mode and variable data rate mode with chain different with the chain that defines among the RC.At the elastic data rate mode, can be supported in any message transmission rate outside the last standard data delivery speed of supporting of RC.Introduce elastic data speed and supported adaptive multi-rate (AMR) codec, i.e. one of 3GPP2 audio coder ﹠ decoder (codec) in the 3GPP physical layer.That is, under the situation of AMR, the current inconsistent data bit of supporting with each 3GPP2RC of standard transmission speed that can produce the 20ms frame period.
On the other hand, provide variable data rate mode for following purpose.In the 3GPP2 system, when the base station specified a fixed data transmission rate to give mobile radio station in a period of time by a message, transmitting and scheduling was carried out to forward complement channel in the base station., the channel conditions between special time period base stations during and mobile radio station may change, and the system load on the base station may change.For example, when mobile radio station left the base station, channel conditions degenerated, and caused the base station to lack enough through-put powers and gave specific mobile radio station with data with current data transmission rate.
For addressing this problem, the base station can stop complement channel being sent data in a period of time., solution causes the delay of transfer of data like this, and the unnecessary waste that can use transmitting power and walsh code.Another mode, the base station can be rearranged message transmission rate the back in the past in a period of time., this other mode also causes time delay and walsh code waste problem.This situation not only appears in the forward link.In reverse link, the channel conditions between mobile radio station and the base station changes with the motion of mobile radio station, causes lacking needed transmitting power to support suitable quality.Therefore, variable data rate mode is used to solve this situation.In variable transmission rate, transmission rate according to circumstances changes with frame.That is, bad if channel circumstance is determined, the base station reduces the transmission rate of complement channel, and if channel circumstance is determined recovery, the transmission rate of base station recovery complement channel.Suppose to use this variable data rate mode, the base station can utilize can use power and not need frequency to rearrange.
For supporting elastic data rate mode and variable data rate mode, each RC among the current 3GPP utilizes following method to form chain.
As mentioned above, the size that is used for the channel interleaver of each RC is fixed according to flare factor.Because flare factor has the numerical value of secondary power form, be actually 1: 2 according to fixing interleaver size of a flare factor and ratio according to the fixing interleaver size of another flare factor of low one-level.If with the bigger flare factor of A representative and with the less flare factor of B representative, the mapping of can be in flare factor and each RC setting up 1:1 between the input information bit stream of channel encoder.If the length of the input information bit stream of channel encoder is expressed as the I that is used for flare factor A respectively
AWith the I that is used for flare factor B
B, set up I
B=2*I
ARelation.If the channel interleaver size of using is expressed as N respectively
AAnd N
B, set up N
B=2*N
ARelation.
As shown in Figure 1, if suppose that the encoding rate (utilizing turbo sign indicating number or convolution code) of channel encoder among the RC is 1/n, consider elasticity or variable data rate mode, wherein I (having the information bit stream length at step 10 and 11 CRC bit, tail bits and the reservation bits that add) is the length of the incoming bit stream of channel encoder, and it satisfies irregular data length I
A＜I＜I
B, input I will provide output n*I, wherein a N
A＜n*I＜N
BAlso be satisfied (step 12).Therefore, certain operation that the output bit stream length n*I and the interleaver size of channel encoder need be mated.A kind of method of 3GPP current application be according to following even repetitive process the output bit stream length L of channel encoder (=n*I) match interleaver N=N
BWith needs and " N
B-n*I " as many bit repetition (step 13).That is, can predict that k output symbol of a repeatable block is from
A code symbols of individual incoming bit stream begins, index k from 0 to N-1.
Then, will a kind of method of support variable data rate pattern be described.
In variable data rate mode, in the initial negotiation process supported peak data rate, be defined as sending set of data rates than the data rate of the low one-level of peak data rate with than the data rate of the low two-stage of peak data rate.Therefore, in the variable data rate mode of current complement channel, message transmission rate can be regulated in the transmission rate of supported maximum transmission rate group and reduction two-stage.For forward channel, mobile radio station detects by blind rate can only determine a rate variable.Therefore, if the message transmission rate excursion is too big, increased the task complexity of mobile radio station.Being used for the channel interleaver of maximum transmission rate and the size of walsh code should not change.That is, be used for the interleaver of maximum transmission rate and walsh code is current should not change.If message transmission rate drop to maximum transmission rate half, need the code element of twice to repeat output bit stream length coupling with interleaver size and channel encoder.Similarly, if message transmission rate drops to 1/4th of maximum transmission rate, need four times code element to repeat to be used for the interleaver size of this channel and the output bit stream length coupling of channel encoder.
Above-mentioned example can be applied in the forward complement channel situation of non-resilient data rate.The variable data rate mode of elastic data speed is supported in complement channel., in the case, the definition of elastic data speed and variable data rate mode self thickens.Promptly, even the peak data rate in the variable data rate mode is the data rate of conventional speed among the current RC and low one-level also is data rate fixing among the current RC, the data rate that can adopt low one-level is as the elastic data speed of not using constant transmissions chain among the current RC.This is because interleaver size is the flare factor that flare factor is fixed to maximum transmission rate in variable data rate mode.
As an example, when turbo sign indicating number that uses 1/2 speed or convolution code, adopt the RC4 of current forward channel.Suppose that when the interleaver size that is used for forward direction RC4 was fixed on 3072, the maximum transmission rate that can be used for variable data rate mode was 76.8kbps.With the variable-data-rate method of discussing in this pattern.Suppose to have used from one group of spendable message transmission rate { 19.2kbps, the appropriate value of 38.4kbps and 76.8kbps}.Although the message transmission rate of 19.2kbps and 38.4kbps is the transmission rate that defines really in RC4, problem is transmission rate not to be connected to the chain of current interleaver size 3072 in RC.Therefore, these transmission rates can be regarded elastic data speed as.
Certainly, even if having the interleaver size that is fixed as N at the variable data rate mode medium chain, current message transmission rate does not define in current RC, by above-mentioned even repeating algorithm (uniform repetitive algorithm) can the match channels encoder output bit stream length and fixing interleaver size.That is, elastic data speed and variable-data-rate are treated in the same manner, can explain the method for supporting them with reference to chain shown in Figure 1.
, supporting the art methods of elastic data rate mode and variable data rate mode to make the notion of elastic data rate mode among the existing RC and variable data rate mode, some is fuzzy.As what explained, the RC notion can be used the normalisation rule that defines the relation in the information data rate as a kind of., at the elastic data rate mode, or in variable data rate mode, can not set up relation as normalisation rule among the RC.In view of the above, the interleaver size of use is fixed, and carries out chnnel coding and carries out the code symbols reprocessing with encoder output and fixing interleaver size coupling according to the encoding rate that uses among the current RC.Therefore, in this elastic data rate mode and variable data rate mode, in the encoding rate of channel encoder and RC, no longer include the standardization relation between the flare factor.
In method, as mentioned above, the repeated encoding code element is to mate encoder output and particular extension factor.It should be noted that, the elastic data rate mode or in variable data rate mode except RC in the standardization chain with external all data rates, I/N and 1/n have following relationship, wherein I/N represents the efficient coding rate, N represents interleaver size, on behalf of the input information bit stream length of channel encoder and 1/n, I represent the encoding rate that defines among each RC.
In other words, formula (1) hint is in elastic data rate mode or efficient coding rate decline in variable data rate mode, use code element to repeat and the interleaver coupling, although the two hints that all the efficient coding rate reduces, the actual coding rate was as being the 1/n that defines in RC in the past.
Therefore, current elastic data rate mode and variable data rate mode have and the problem of not utilizing by the obtainable coding gain of minimizing encoding rate.Promptly, if interleaver size is fixed on certain numerical value, the current transmission rate that will send data is fixed, must select to provide the encoding rate of maximum coding gain according to both relations, and form new chain and carry out rate-matched perforation or Data Matching repetition, so that with encoder output and channel interleaver size coupling.
Quote above-mentioned reference paper as suitable instruction at this to extra or other details, feature and/or technical background.
Summary of the invention
The objective of the invention is to solve the problems referred to above at least and/or shortcoming and the advantage of at least after this describing is provided.
The purpose of this invention is to provide a kind of method, be used for disposing chain, eliminate one or more problems that restriction and shortcoming by prior art cause basically in the 3GPP2 communication system.
Another object of the present invention provides a kind of method, is used for disposing chain in the 3GPP2 communication system, and wherein the information bit stream of unconventional data rate can be mapped to the interleaver size in elasticity or the variable-data-rate transmission mode in physical layer.
Another object of the present invention provides a kind of method, is used for disposing chain in the 3GPP2 communication system, has introduced the new RC that can not only support routine data speed but also support elasticity or variable-data-rate.
Another object of the present invention provides a kind of method, be used for disposing chain in the 3GPP2 communication system, wherein the flare factor of appointment or channel interleaver size are fixed in the call negotiation process, and reduce encoding rate as far as possible in elasticity or variable data rate mode.
Another object of the present invention provides a kind of method, is used for disposing chain in the 3GPP2 communication system, can provide the output bit stream of channel encoder and the maximum performance of fixed channel interleaver size coupling.
Realize these purposes at least for a part or whole part ground, a kind of data processing method that is used for rate-matched in communication system is provided, this method comprises: I information bit encoded with encoding rate 1/n by the turbo encoder, with L bit that is encoded of output; Sequentially with coded bit groupings in a plurality of set of symbols, these a plurality of set of symbols have from 0 to I-1 index, and comprise verso tuple and have the odd symbol group of odd number index with even number index, the length of each set of symbols in wherein a plurality of set of symbols is n, and each set of symbols includes an information bit and n-1 Parity Check Bits; And coded bit carried out perforation, and with size and channel interleaver size N coupling that will coded bit, wherein can bore a hole to having the index 2j that satisfies formula (jK) mod J＜K and the set of symbols execution of 2j+1, wherein J is
K is
And j is the integer from 0 to J-1.
The other advantage of the present invention, purpose and feature will partly be set forth in the following description, partly can be understood by those skilled in the art according to the careful examination to following content, or be appreciated that by the present invention's practice.The mode that objects and advantages of the present invention can particularly point out according to subsidiary claims realizes or obtains.
Description of drawings
With reference to the present invention of following accompanying drawing message semantic definition, reference number identical among the figure is represented identical unit, wherein:
Fig. 1 represents the radio configuration (RC) of prior art in the forward link, is used to support elasticity or variable-data-rate;
Fig. 2 represents to support according to the preferred embodiment of the invention the chain of the turbo sign indicating number of elasticity and/or variable-data-rate;
Fig. 3 represents to support according to the preferred embodiment of the invention the chain of the convolution code of elasticity and/or variable-data-rate;
Fig. 4 represents to support according to the preferred embodiment of the invention the radio configuration in the forward link of 1X elasticity and/or variable-data-rate;
Fig. 5 represents to support according to the preferred embodiment of the invention the chain of the turbo sign indicating number of elasticity and/or variable-data-rate;
Fig. 6 represents that according to the preferred embodiment of the invention chain middle punch at the turbo sign indicating number is to support the example of elasticity and/or variable-data-rate;
Fig. 7 represents that according to the preferred embodiment of the invention chain middle punch at the turbo sign indicating number is to support another example of elasticity and/or variable-data-rate.
Embodiment
Example below with reference to accompanying drawings is elaborated to the preferred embodiment of the present invention.The present invention proposes a kind of enhancing rate matching pattern (ERAM), it is a kind of channel coding method, the condition that this method satisfies is, under the given channel circumstance that communication system can be operated in elasticity and/or variable data rate mode, the flare factor of appointment or channel interleaver size can make the efficient coding rate low as far as possible in the negotiation.Therefore, the present invention's proposition is used for two kinds of methods at each RC or the new chain of new RC configuration, can support elasticity and/or variable data rate mode most effectively.
At first, propose a kind of method that is used for combined elastic and variable data rate mode, be used for disposing the new chain of each RC to satisfy the above-mentioned condition of existing RC.Secondly, a kind of new RC collocation method of supporting elasticity and/or variable-data-rate is proposed.
The preferred embodiments of the present invention are described with reference to the accompanying drawings.At first, explanation is used for support the elasticity of each RC and/or the first method of variable-data-rate.If the length of the input information bit stream of the channel encoder that defines among RC is with " I " expression, and for the size of the channel interleaver of this information bit stream definition with " N " expression, so in the routine data rate mode between " I " and " N " formation one 1 pair 1 chain (1-to-1chain).But, in elasticity or variable data rate mode, do not satisfy the 1:1 chain condition.Therefore, need a new chain to come the length of the input information bit stream of the size " N " of connecting channel interleaver and channel encoder.
First embodiment
Fig. 2 represents to be used to support according to first preferred embodiment of the invention the chain of the turbo sign indicating number of elasticity and variable-data-rate.
Referring to Fig. 2, in the time need in each RC, forming the chain configuration of the data rate different with routine data speed, by one 1/5 speed turbo encoder (channel encoder) to channel bit (or information bit), information bit stream (having length " I ") as CRC (cyclic redundancy check (CRC)) bit and the tail bits of detection bits is carried out chnnel coding (step 20).The carry-out bit of channel encoder is flow to the perforation of scanning frequency rate coupling, and (5*I＞N) or rate-matched repeat that (5*I＜N) is with the length L=5*I of coupling output bit stream and the size " N " (step 21) of channel interleaver.Whole input information bit stream is carried out rate-matched perforation or rate-matched repetition equably.
Because therefore all the turbo sign indicating numbers with 1/2,1/3 and 1/4 speed that use among each RC can obtain above-mentioned chain by perforation forms to 1/5 speed turbo sign indicating number.For example, when the length " I " of the input information bit stream in the elastic data rate mode among the RC4 is 769 bits, the size of channel interleaver " N " will be 3072 bits.Therefore since the length " L " of the output bit stream of channel encoder be 1538 (=769*2), the prior art channel configuration need reach the repetition of the output bit stream of (3072-1538) bit, with size " N " (3072) coupling of channel interleaver.Therefore, although the efficient coding rate is 0.25 (769/3072), the same in actual encoding rate and the prior art is 1/2.
But in the chain of first preferred embodiment, " L " is 3845 (5*769), and needs nearly (3845-3072) bit of perforation, to mate with channel interleaver size (N=3072).Therefore, actual encoding rate is 0.25 (769/3072), has obtained coding gain.
As another example, if the length " I " of the input information bit stream of the channel encoder of use turbo sign indicating number is 1535, the size of channel interleaver " N " is 3072 bits so.Because the length " L " of the output bit stream of channel encoder is 3070 (1535*2), the configuration of prior art chain needs to reach the repetition of (3072-3070) bit to mate with channel interleaver size (N=3072).Therefore, the efficient coding rate is 0.5 (1535/3072), and this is almost identical with the encoding rate that uses among the RC of prior art chain.
Chain of the present invention has " L "=7675 (5*1535), and needs perforation to reach (7675-3072) bit to mate with interleaver size N=3072.In view of the above, actual encoding rate is 0.5 (1535/3072), to allow and the identical performance of efficient coding rate that can obtain from the prior art chain, because 1/2 speed turbo sign indicating number is the coding by the 1/5 speed turbo sign indicating number acquisition of boring a hole.Therefore, chain of the present invention can improve the performance in all elastic data rate areas.
But when using convolution code, situation may be different.Take a forward direction RC4 as an example.In the case, in RC, use 1/4 rate convolutional code in undefined all chains.Identical with previous example, suppose that the length " I " of the input information bit stream of channel encoder is 769 bits, channel interleaver size " N " is 3072 so.The length " L " that the output bit stream of the channel encoder that provides is provided the prior art chain is 1538 (769*2), therefore needs the nearly repetition of (3072-1538) bit, to mate with channel interleaver size N=3072.In view of the above, although the efficient coding rate is 0.25 (769/3072), the actual coding rate still is fixed as 1/2 with the same in the past.
But the chain configuration of first preferred embodiment provides " L " 3076 (4*769), and this needs perforation (3076-3072) to mate with channel interleaver size N=3072.In view of the above, the actual coding rate is 0.25 (769/3072), has obtained the actual coding gain.
But as another example, if the length " I " of the input information bit stream of channel encoder is 1535, channel interleaver size " N " is 3072 so.Therefore, it is 3070 (1535*2) that the configuration of prior art chain provides " L ", and this needs repetition (3072-3070) bit with coupling " N ".In view of the above, the efficient coding rate is 0.5 (1535/3072), make the actual coding rate almost with existing RC in identical.
But it is 6140 (4*1535) that the chain configuration of first preferred embodiment provides " L ", and this needs perforation (6140-3072) bit to mate with channel interleaver size " N " (=3072).In view of the above, the actual coding rate is 0.5 (1535/3072).But, in the case, encoding rate with can be identical by about 50% encoding rate that obtains that 1/4 rate code is bored a hole.Different with the situation of turbo sign indicating number, under the convolution code situation, owing to be used for 1/2 speed, 1/3 speed, define respectively with the optimum code multinomial of 1/4 speed, the performance of the chain configuration of first preferred embodiment may be than the poor performance of prior art chain configuration.As countermeasure, the second following embodiment has been proposed.
Second embodiment
Second embodiment proposes a kind of when using convolution code to replace turbo sign indicating number among first embodiment, is used to dispose the chain of RC to support the method for elasticity or variable data rate mode.
At first, the chain of the configuration data rate different if desired with the routine data speed that defines among the corresponding RC, the convolution coder that adopts 1/n speed is as channel encoder, and requiring the reciprocal value of encoding rate " n " suitably to be fixed as a value so that optimum performance to be provided by the relation of following basis " I " and " N ", the length of using rate-matched perforation n*I＞N or rate-matched to repeat n*I＜N to come the output bit stream of match channels encoder " L " (=n*I) and the size " N " of channel interleaver.
N/I＜2.5----→n＝2 (2)
2.5≤N/I＜3.5----→n＝3 (3)
3.5≤N/I----→n＝4 (4)
Secondly, a kind of method of chain of the convolution code that is used to dispose elasticity and variable-data-rate has been proposed.Fig. 3 represents to have according to the preferred embodiment of the invention the chain of the convolution code that is used to support elasticity and variable-data-rate.
Referring to Fig. 3, the chain of the data rate that the routine data speed that defines among configuration and the corresponding RC of convolution code is different if desired, the convolution coder that adopts 1/n speed so is as channel encoder (step 30).Use rate-matched perforation n*I＞N or rate-matched repeat n*I＜N come at the output bit stream of channel encoder length " L " (=n*I) and mate (step 31) between the channel interleaver size " N ".The inverse of encoding rate " n " is a value that sends from the upper strata from fixing negotiations process.That is,, can dispose the chain of the convolution code that is used for elastic data speed and variable-data-rate by the inverse of encoding rate is added to one in the parameter that the negotiations process that is used for prior art elasticity or variable data rate mode sends.With identical among first embodiment, the whole input information bit stream of channel encoder is carried out the rate-matched perforation or rate-matched repeats equably.
As an example, suppose the current negotiation that in a forward direction RC4, is used to use the elastic data rate mode.If interleaver size " N " is 3072, and " I " be 1535, and " n " can be sent as 2 so.By this signaling, might dispose and have with current elasticity or variable data rate mode is identical or the chain of better performance.Said method is to be used in method with the new chain of elastic data speed and variable-data-rate transmission of the RC of each current definition configuration.But basic skills is new RC who is used to support elastic data speed and variable-data-rate of definition.
The 3rd embodiment
Fig. 4 represent according to third embodiment of the invention be used for support 1X elasticity and variable-data-rate, in the radio configuration of a forward link.Referring to Fig. 4, new RC chain of following configuration.
In crc block (step 40), having from { 6,8,12, the CRC bit of a length of selecting among the 16} adds the channel bit that is used for error detection to.The method that is used for fixing the length of CRC among the new RC can send signal between transmission terminal and receiving terminal in the initial negotiation step.After adding the CRC bit to channel bit, add tail bits or reservation bit to it.If use convolution code then add 8 tail bits, when using the turbo sign indicating number, add 6 tail bits and two reservation bits to it to it.At last, the length of the incoming bit stream of channel encoder can be defined as I=x+c+8, and wherein " x " represents the length of channel bit, the length (step 41) of " c " expression CRC.The turbo sign indicating number only is defined as incoming bit stream length " I " at channel encoder uses in greater than 384 situation, and always have 1/5 encoding rate.
In order to use this RC, in the initial negotiation step, need to agree following criterion between transmission and the receiving terminal.At first, the data rate and the flare factor (being channel interleaver size " N ") of the information bit that use are reached an agreement.Length to the CRC bit that will use must be reached an agreement, and still is that convolution code also should be reached an agreement to using the turbo sign indicating number.If use the turbo sign indicating number, only use 1/5 rate channel encoder.On the other hand, if use convolution code, the reciprocal value of the encoding rate of convolution code " n " can be fixed to from { 2 according to the incoming bit stream length " I " of channel encoder and the ratio between the channel interleaver size " N ", 3,4, the value that 6} selects perhaps sends in the initial negotiation step (step 42).Data rate mode in the chain of the routine data rate mode among the performance of RC and all existing RC is identical thus defined, and is equal to or better than the data rate mode in the chain of elastic data rate mode and variable data rate mode.
The 4th embodiment
The 4th embodiment proposes a kind of chain that is used for the turbo sign indicating number of elastic data speed or variable-data-rate.Fig. 5 represents to be used to according to the preferred embodiment of the invention to support the chain of the turbo sign indicating number of elasticity or variable-data-rate.Referring to Fig. 5, produce the input information bit stream of channel encoder according to following process.At first, the CRC bit length is added to channel bit with in CRC bit block error detection (step 50).In the case, be used for fixing the method for the CRC length among the new RC and can be in the initial negotiation step send signal sending between terminal and the receiving terminal.After adding the CRC bit to channel bit, add tail bits or reservation bit (step 51).For the turbo sign indicating number, add 6 tail bits and 2 reservation bits.Then, when needs form the chain configuration of the data rate different with the routine data speed that defines among the RC by using the turbo sign indicating number, can use a 1/n speed turbo encoder conduct to be used for the channel encoder (step 52) of chnnel coding.
The length " L=n * I " of the output bit stream of channel encoder stands rate-matched perforation, and (5I＞N) or rate-matched repeat that (5I＜N) is with at (n * I) and mate (step 53) between the channel interleaver size " N ".The reciprocal value of Turbo encoding rate " n " be fixed to from 2,3,4, a value of selecting among the 5}.According to the fixing turbo encoding rate of the length " I " of the input information bit stream of channel encoder and the ratio between the channel interleaver size " N ".
The rate-matched that is used for the turbo sign indicating number repeats to be applied to a kind of in the situation of interleaver size during greater than 5I, and this situation needs a kind of algorithm of being convenient to energy distribution uniformity.Therefore, when repeating, the rate-matched of using the turbo sign indicating number preferably adopt the even code element of prior art to repeat.That is, carrying out after rate-matched repeats, might be for index k from the
The bit of information bit stream begins to predict (k) output bit in the output bit stream, and wherein index k is increased to " N-1 " from " 0 ".
As a reference, according to perforation of relational application rate-matched or the rate-matched repetition of " 5I " among Fig. 5 and " N ", because spendable minimum turbo encoding rate is no matter how the ratio of " N " and " I " all is fixed to 1/5.But, owing to need under following basic assumption, carry out the rate-matched perforation of turbo sign indicating number, even so that obtain coding gain preferably under the condition of 5I＜N, therefore the sign indicating number type of the encoding rate of the ratio fixed channel encoder of basis " N " and " I " and rate-matched perforation is along with encoding rate changes.Described basic assumption can followingly be summarized.
(1) the systematic bits (information bit) from two composition encoders is not bored a hole.
(2) the Parity Check Bits carry-out bit stream from two composition encoders is carried out the perforation of even amount.
(3) the puncture codes type from the parity check of composition encoder output bit stream is designed to uniformly.
In addition, consider from the realization aspect, according to the puncture codes type of the perforation algorithm of new proposition preferably with the puncture codes type back compatible that is used for existing routine data speed.Therefore, a kind of new chain is proposed, its convenient perforation of satisfying above-mentioned three conditions, this perforation simultaneously can be exchanged with the puncture codes type in existing routine data speed definition, bores a hole according to the puncture codes type that describes below.
At first, should be according to the fixing encoding rate of turbo encoder of the relation of " N " and " I ".Certainly owing to can obtain all turbo encoding rates by perforation 1/5turbo encoding rate, might be fixed on the 1/5turbo encoding rate at the encoding rate of turbo encoder after, finally adjust this encoding rate at a rate-matched piercing terminal.But because a perforation piece is arranged in existing turbo encoder, this perforation piece at first is used to according to the relation of " N " in the turbo encoder and " I " regular coding rate suitably, and the bit stream according to this encoding rate generation is carried out rate-matched bore a hole.By after using perforation piece in the turbo encoder to fix the encoding rate of output bit stream of turbo encoder, the length of output bit stream that will have the channel encoder of so fixing encoding rate is mated with interleaver size.If interleaver size less than 5I, is bored a hole under condition shown in the table 1.
Table 1
Referring to table 1, when the chain that forms the data rate different with routine data speed among each RC when needs disposes, utilize a 1/n speed turbo encoder (channel encoder) to channel bit, the information bit stream of CRC incorrect bit and tail bits (having length " I ") is carried out chnnel coding." n " is the inverse of the encoding rate of turbo encoder.Below the situation of three kinds " I " and " N " relation different puncture codes types is arranged, the length of the information bit stream of " I " expression turbo encoder wherein: if 2I＜N≤3I, n=3; 3I＜N＜4I, n=4; 4I＜N≤5I, n=5.
Therefore, from 1/n speed turbo encoder by an information bit in the bit stream of chnnel coding and transmission and in a sequence, add the individual Parity Check Bits of (n-1) of information bit to and form a unitary code tuple, it has length " n ".
As example, when " n "=3, two Parity Check Bits that the unitary code tuple has an information bit and adds from the first composition encoder of turbo encoder and the second composition encoder.That is, the unitary code tuple has " n " individual bit.Therefore, the unitary code tuple has the index that is increased to " I-1 " from " 0 ", and is classified as even number set and odd number group according to the odd number or the even number of index.Even number set or odd number group are commonly referred to the combination code block.Each combination code block has
Individual unitary code tuple, wherein the verso tuple comprises the group with 2j index, and the odd symbol group comprises the group with 2j+1 index, and wherein " j " expression is increased to the unit element group index of J-1 from " 0 ".When the output bit stream of channel encoder has length " L ", according to the perforation of the afterbody puncture codes type shown in the table 1 (I-1) unitary code tuple.
Expression is not more than the maximum integer of I/2.Because the length " L " of the output bit stream of 1/2 rate channel encoder has value " n * I ", the bit number " K " that in each of even number set and odd number group, will bore a hole can by
Calculate.
The same with previously presented condition, in order on the whole output bit stream of channel encoder, evenly to bore a hole and not carry out the perforation of first bit (it is the input information bits of channel encoder) in each unitary code tuple, the present invention adopts the puncture codes type that uses in the routine data speed shown in the table 1, and exception is to use the correction puncture codes type of routine data speed during greater than 3I and less than 4I in interleaver size " N ".Particularly, for the even perforation of the output bit stream that carries out channel encoder, the even number that bore a hole and odd number unitary code tuple have the index " j " that satisfies with lower inequality (5).
(j×K)mod?J＜K (5)
Inequality (5) prediction is convenient in " J " individual unitary code tuple makes up " j " of the even perforation of " K " the individual bit that will bore a hole in code block (even number set among first embodiment and odd number group) at each.And inequality (5) is predicted " j " of " u " the individual combination code block on specific " n " that is used for the 5th embodiment, will be explained below.
Illustrate in greater detail perforation procedure below with reference to Fig. 6 and 7 according to four preferred embodiment of the invention.Fig. 6 represents according to the preferred embodiment of the invention the example in the chain middle punch of the turbo sign indicating number that is used to support elasticity or variable-data-rate, and Fig. 7 represents according to the preferred embodiment of the invention another example in the chain middle punch of the turbo sign indicating number that is used to support elasticity or variable-data-rate.
Referring to Fig. 6 and 7, when index j satisfy inequality (5) and have the even number of (2j) and (2j+1) index respectively and odd number unitary code tuple be defined as shown in Fig. 6 to relation (pair relation) time, this unitary code tuple to relation is bored a hole simultaneously.Dash area among Fig. 6 represents to have the perforated unitary code tuple of index 2j or 2j+1, and wherein " j " satisfies inequality (5).By bit perforation, make this unitary code tuple have the even distribution of perforation bit to relation to diverse location.
Especially, as shown in Figure 7, when the length of the output bit stream of channel encoder was odd number, even number set was Duoed a unitary code tuple than odd number group, and this unitary code tuple always is perforated.In the fourth embodiment of the present invention, at first according to the fixing inverse of the encoding rate of turbo encoder " n " of the relation of the length " I " of the information bit stream of interleaver size " N " and channel encoder.Then, define the puncture codes type that will use.This puncture codes type is the puncture codes type of a basis in the puncture codes type formation of available data speed use.Basically, based on this yard type on the unitary code tuple perforation or do not bore a hole can so that the definition the puncture codes type and the existing puncture codes type of routine data speed can exchange.In the case, " 2j " in even number set and odd number group and " 2j+1 " unitary code tuple form this puncture codes type respectively.Perforated unitary code tuple is to the even distribution occasion of the perforation bit of the Parity Check Bits that satisfies each composition encoder.
The 5th embodiment
The 5th embodiment shows another example of the chain of the turbo sign indicating number that is used for elasticity and/or variable-data-rate.
Table 2
Referring to table 2, when utilizing the data rate different to dispose chain with routine data speed among each RC, utilize a 1/n speed turbo encoder (channel encoder) to channel bit, the information bit stream of CRC incorrect bit and tail bits (having length " I ") is carried out chnnel coding." n " is the inverse of the encoding rate of turbo encoder.Below the puncture codes type difference of three kinds of situations: if 2I＜N≤3I, n=3; If 3I＜N＜4I, n=4; If 4I＜N＜≤5I, n=5.
In the output bit stream of channel encoder, information bit and (n-1) individual Parity Check Bits form a unitary code tuple that has from " 0 " to the I-1 index, the unitary code tuple that wherein has the even number index when n=3 or 5 is classified as even number set, and the unitary code tuple with odd number index is classified as odd number group.When n=3 or 5, the parameter " u " of the number of another combinational code tuple that expression is formed by the unitary code tuple has value 2.
But, when n=4, u=3.Promptly, output bit stream from encoding rate 1/4 channel encoder comprises a plurality of unitary code tuples, the unitary code tuple comprises an information bit and three Parity Check Bits, and its index forms a combinational code tuple divided by 3 each group that can obtain the unitary code tuple of same remainder, so that 3 combinational code tuples to be provided when the u=3.Form " I " individual unitary code tuple altogether for one specific " n ", and the combinational code tuple has its index (j+1)-1 from uj to u
Individual unitary code tuple, wherein " j " is the number from 0 to J-1.
Be to be not more than " I " maximum integer divided by the value of " u " acquisition.
With identical among the 4th embodiment,, (I-1) unitary code tuple is bored a hole according to the afterbody puncture codes type shown in the table 2 when the length " L " of the output bit stream of channel encoder when being odd number.If " j " satisfies inequality (5), each combinational code tuple of boring a hole so in couples, wherein the unitary code tuple has the index from " uj " to " u (j+1)-1 ".According to the different puncture codes types that are used for identical " n " shown in the table 2 paired unitary code tuple is bored a hole.
Different with the 4th embodiment, when n=4, be 4 from the bit number " p " of a unitary code tuple perforation that is allowed to, make and can support routine data speed puncture codes type the subsection perforation of carrying out in the relation.When n=3 or 5, the bit number " p " of the unitary code tuple middle punch that be allowed in paired each is 2.Therefore, for one specific " n ", the bit number " K " of each combinational code tuple middle punch can by
Calculate.
With identical among the 4th embodiment, the 5th embodiment is as shown in table 2 not to bore a hole at first bit, with as above-mentioned hypothesis in propose prevent bore a hole at information bit, and perforation is to carry out at each bit with the index " j " that satisfies inequality (5), so that the even distribution of the perforation bit in the whole output bit stream to be provided.
In a word, the difference of the perforation algorithm of table 2 and the perforation algorithm of table 1 is, preceding a kind of algorithm of boring a hole is with the number dividing unit set of symbols of unit puncture codes type in the whole puncture codes type, and then a kind of perforation algorithm is divided into even number set and odd number group with the unitary code tuple.As example, when interleaver size " N " greater than 3I and when being equal to or less than 4I, the whole output bit stream of channel encoder is divided into a plurality of unitary code tuples, and each unitary code tuple has an information bit and adds three Parity Check Bits of this information bit in succession to.And then, the unitary code tuple is divided into three combinational code tuples, to the puncture codes type shown in each combinational code tuple application table 2.
The 6th embodiment
The 6th embodiment proposes to be used for another example of chain of the turbo sign indicating number of elasticity or variable-data-rate.
Table 3
Referring to table 2, when the chain configuration of data rate that need be different with the routine data speed among each RC, utilize a 1/n speed turbo encoder (channel encoder) to channel bit, the information bit stream of CRC incorrect bit and tail bits (having length " I ") is carried out chnnel coding." n " is the inverse of the encoding rate of turbo encoder.Situation for following three kinds " I " and " N " relation has different puncture codes types, wherein the length of the information bit stream of " I " expression turbo encoder: if 2I＜N≤3I, n=3; If 3I＜N＜4I, n=4; If 4I＜N＜5I; N=5.
In the output bit stream of channel encoder, information bit and (n-1) individual Parity Check Bits form a unitary code tuple with index from " 0 " to " I-1 ", wherein be classified as even number set at n=3 or the unitary code tuple that had the even number index at 5 o'clock, the unitary code tuple with odd number index is classified as odd number group.N=3 or 5 o'clock, the parameter " u " of the number of the combinational code tuple that expression is formed by the unitary code tuple had value 2.
But, when n=4, u=3.Promptly, output bit stream from 1/4 encoding rate channel encoder comprises a plurality of unitary code tuples, the unitary code tuple comprises an information bit and three Parity Check Bits, and its index forms a combinational code tuple divided by 3 each group that can obtain the unitary code tuple of same remainder, so that 3 combinational code tuples to be provided when the u=3.Form " I " individual unitary code tuple altogether for one specific " n ", and each combinational code tuple has its index (j+1)-1 from uj to u
Individual unitary code tuple, wherein " j " is the number from 0 to J-1.
Be to be not more than " I " maximum integer divided by the value of " u " acquisition.
The difference of the 6th embodiment and the 5th embodiment is, according to the relation of " L " and " u " of the output bit stream of channel encoder, according to the afterbody puncture codes type shown in the table 3 the nearly decline perforation of the unitary code tuple of (Lmod u).
The 7th embodiment
The 7th embodiment has proposed to be used for another example of chain of the turbo sign indicating number of elasticity and/or variable-data-rate.
Table 4
The 6th embodiment and the 7th embodiment have different puncture codes types during greater than 3I and less than 4I in interleaver size " N ".Under other situation, the puncture codes type is identical with the 6th embodiment.But, if " L " is not 3 multiple, then need the perforation that adds, use a kind of slightly different method for punching to it.That is, when " L " is not 3 multiple, need carry out overpunch to the decline of the unitary code tuple of (L mod u) nearly, the puncture codes type is P0 and do not consider the unitary code tuple.Certainly, just as proposed, so that the puncture codes type that defines in the turbo encoder also is included in when interior, the method for punching in the unitary code tuple also can be applicable to the situation of the total stuck-at-of a kind of encoding rate with the turbo encoder/5 when needs definition puncture codes type.
The 8th embodiment
The 8th embodiment proposes another example of the chain that is used for elasticity and/or variable data rate mode as shown in table 5.
Table 5
The 4th embodiment only has different puncture codes types in the scope of 3I＜N＜4I with the 8th embodiment, and wherein I is the information bit number that comprises every frame of reservation and tail bits, and N is the size of interleaver.For other situation, the 8th embodiment is identical with the 4th embodiment.
The code symbols group has the index from i=0 to I-1.If satisfy (j*K) mod J＜K, allow to carry out code element perforation so to code symbols group with index 2j and 2j+1.Herein, J and K are defined as
With
Be used for the sign indicating number type of code symbols group i perforation is defined as P
(i mod 2)
Utilize the data bit period encoded symbols corresponding group perforation of data puncture codes type pair and the output of turbo encoder.If n*I is an odd number, also (I-1) code symbols group is bored a hole.
As mentioned above, this method that disposes chain in the 3GPP2 system has lot of advantages.For example, the preferred embodiments of the present invention provide a kind of new good chain that is used to support elasticity or variable-data-rate by obtain bigger coding gain under the hypothesis of using identical flare factor.And, preferred embodiment provides new RC, to support elasticity and variable-data-rate, allow to support all data rates in the standardized chain among existing all RC and do not make degradation, and provide good chain by in elasticity and variable-data-rate, obtaining better coding gain.
And preferred embodiment can support to have the chain of the transmission rate higher than the maximum transmission rate of supporting among the existing RC.Because puncture codes type of the present invention can exchange with the prior art puncture codes type with routine data speed, the present invention has advantage aspect realization.When supporting to be used for the elastic data rate mode of complement channel, except the time diversity gain that repeats from code element, can obtain the coding gain that reduces, thereby reduce through-put power from the actual coding rate.
Other advantage of the present invention, purpose and characteristic ground will propose in the following description, partly can be understood by examining the following describes by those skilled in the art, perhaps can obtain by practice of the present invention.Can realize and obtain objects and advantages of the present invention by the mode that particularly points out in the claims.
The foregoing description and advantage only are exemplary, are not limited to the present invention.The present invention is easy to be applied to the equipment of other type.Explanation of the present invention is schematically, does not limit the scope of the claims.Those skilled in the art are easy to carry out multiple substituting, and revise and modification.In the claims, the statement that device adds function is in order to contain the structure of the described function of execution described herein, not only to comprise the equivalent of structure but also comprise structure of equal value.
Claims (8)
1. data processing method that in communication system, is used for rate-matched, this method comprises:
I information bit encoded with encoding rate 1/n by the turbo encoder, with L bit that is encoded of output;
With coded bit groupings in a plurality of set of symbols, these a plurality of set of symbols have from 0 to I-1 index, and comprise verso tuple and have the odd symbol group of odd number index with even number index, the length of each set of symbols in wherein a plurality of set of symbols is n, and each set of symbols includes an information bit and n-1 Parity Check Bits; And
Coded bit is carried out perforation, with size and channel interleaver size N coupling that will coded bit, wherein can bore a hole to having the index 2j that satisfies formula (jK) mod J＜K and the set of symbols execution of 2j+1, wherein J is
K is
And j is the integer from 0 to J-1.
2. method as claimed in claim 1, wherein, when 2＜N/I≤3, encoding rate is 1/3; When 3＜N/I≤4, encoding rate is 1/4; When 4＜N/I＜5, encoding rate is 1/5.
3. method as claimed in claim 1, wherein, the quantity K with perforated bit in each set of symbols is
4. method as claimed in claim 1 wherein, when described encoding rate is 1/3, is used puncture codes type ' 110 ' and ' 101 ' respectively to set of symbols with index 2j and the set of symbols with index 2j+1.
5. method as claimed in claim 1, wherein, if set of symbols has tail bits, then when described encoding rate was 1/3, the set of symbols with index 2j was ' 101 ' with the afterbody puncture codes type with set of symbols of index 2j+1.
6. method as claimed in claim 1, wherein, if set of symbols has tail bits, then when described encoding rate was 1/4, the set of symbols with index 2j was ' 1011 ' with the afterbody puncture codes type with set of symbols of index 2j+1.
7. method as claimed in claim 1 wherein, when described encoding rate is 1/5, is used puncture codes type ' 11101 ' and ' 11011 ' respectively to set of symbols with index 2j and the set of symbols with index 2j+1.
8. method as claimed in claim 1, wherein, if set of symbols has tail bits, then when described encoding rate was 1/5, the set of symbols with index 2j was ' 11011 ' with the afterbody puncture codes type with set of symbols of index 2j+1.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR38388/2000 | 2000-07-05 | ||
| KR1020000038388A KR100720566B1 (en) | 2000-07-05 | 2000-07-05 | Method of Data Rate Matching and apparatus for data processing |
| KR1020000048083A KR100813038B1 (en) | 2000-08-19 | 2000-08-19 | Method and apparatus for data processing in a transmission chain |
| KR48083/2000 | 2000-08-19 | ||
| KR1020000066532A KR100781240B1 (en) | 2000-11-09 | 2000-11-09 | Data Rate Matching Method in 3GPP2 |
| KR66532/2000 | 2000-11-09 |
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| CNB011200243A Division CN100464510C (en) | 2000-07-05 | 2001-07-05 | Method of patching transmission in mobile communicating system |
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| KR100880630B1 (en) * | 2002-09-11 | 2009-01-30 | 엘지전자 주식회사 | Transmission chain in communication system and method for transmitting and detecting physical channel format uging the same |
| KR100678580B1 (en) * | 2005-10-14 | 2007-02-02 | 삼성전자주식회사 | Apparatus and method for increasing turbo code performance in communication system |
| KR101233175B1 (en) * | 2006-11-08 | 2013-02-15 | 엘지전자 주식회사 | Method For Encoding And Decoding Turbo Code With Continuous Length |
| CN102067640B (en) * | 2009-03-20 | 2014-04-30 | 富士通株式会社 | Channel interleaving method and channel interleaver |
| CN101860412B (en) * | 2009-04-13 | 2015-10-21 | 中兴通讯股份有限公司 | Sub-packet processing method, code modulating method, processor, modulation coding system |
| US9178658B2 (en) | 2009-05-06 | 2015-11-03 | Futurewei Technologies, Inc. | System and method for channel interleaver and layer mapping in a communications system |
| US9866364B2 (en) | 2014-08-29 | 2018-01-09 | Huawei Technologies Co., Ltd. | System and method for semi-orthogonal multiple access |
| CN109257139B (en) * | 2017-07-14 | 2021-10-01 | 深圳市中兴微电子技术有限公司 | Method and device for transmitting and receiving physical layer data |
| CN109560820B (en) * | 2018-11-23 | 2021-07-13 | 福州大学 | Decoding simplification method combining channel coding and physical layer network coding |
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| CN1255000A (en) * | 1998-11-02 | 2000-05-31 | 日本电气株式会社 | Speed matching method and digital communication system |
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| US5872775A (en) | 1996-10-30 | 1999-02-16 | Qualcomm Incorporated | Method and apparatus for performing rate determination |
| KR100334819B1 (en) * | 1998-06-05 | 2002-05-02 | 윤종용 | Channel coding device and method for rate matching |
| KR100526537B1 (en) * | 1999-02-13 | 2005-11-08 | 삼성전자주식회사 | Apparatus and method for allocating orthogonal codes in cdma communication system having variable rate channel structure |
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