CN101471758B

CN101471758B - Mixing automatic retransmission processing method

Info

Publication number: CN101471758B
Application number: CN200710307825A
Authority: CN
Inventors: 杨晓辉
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2007-12-28
Filing date: 2007-12-28
Publication date: 2012-09-26
Anticipated expiration: 2027-12-28
Also published as: CN101471758A

Abstract

The invention provides a hybrid automatic repeat request (HARQ) processing method. The method comprises the following steps: judging whether the received data is the new data of primary transmission according to the retransmitted serial number (RSN); if yes, allowing a rate de-matching module to perform the rate de-matching operation of the new data and then allowing a Turbo decoding module to decode the rate de-matched data and outputting the decoded data; if the received data is the HARQ retransmitted data of the transmitted data of previous transmission time interval (TTI), allowing a hybrid rate de-matching module to calculate the hybrid resolved data, and then allowing a Turbo soft-combining module to perform the Turbo soft decoding operation and the soft combining operation of the HARQ data which are transmitted for several times and the hybrid data; and performing the hard decision of the obtained soft information data to obtain the final data result. Compared with the prior art, the HARQ processing method processes the HARQ processing and the Turbo decoding as a whole; combines the Turbo decoding soft information processing gain and the HARQ time diversity combining gain; and improves the overall retransmission efficiency and the retransmission combination performance.

Description

Mixing automatic retransmission processing method

Technical field

The mixing that the present invention relates in the moving communicating field retransmits (HARQ) treatment mechanism problem automatically.

Background technology

Present mixing retransmits HARQ automatically and mainly contains three kinds of patterns: wrong bag abandons, redundant retransmission and Chase merge.The processing of existing HARQ data generally is at first to carry out pattern to judge, adopts each self-corresponding rate-matched, merging and interpretation method of separating to handle concrete process such as Fig. 1, Fig. 2 and shown in Figure 3 to different patterns then.

If what receive is new data, then at first the data of receiving is separated rate-matched, and then carry out Turbo decoding and obtain final court verdict; If what receive is not new data, belong to the HARQ data retransmission, and that adopt is HARQ pattern I: wrong bag abandons, and then abandons front data several times, and the data of newly receiving are separated rate-matched, and then carries out Turbo decoding and obtain final court verdict.

If what receive is not new data; Belong to the HARQ data retransmission; And that adopt is HARQ pattern II: redundant retransmission; Then at first the new data that receives is separated rate-matched and obtain Currentde-data; Then with its with the front several times associated transport separate rate-matched as a result Previous de-data carry out " ∪ " computing, finally be integrated into the data flow of a low code rate to the high code rate data of transmission several times, and then the Turbo that hang down code check deciphers and to obtain final court verdict.

If what receive is not new data; Belong to the HARQ data retransmission; And what adopt is that HARQ pattern III:Chase merges; Then the reception data Previous data of associated transport and Current data carry out the high specific merging based on SNR or SINR at first several times, and the result after utilization merges then carries out Turbo decoding and obtains final court verdict.

The general process that current HARQ handles such as Fig. 1, Fig. 2 and shown in Figure 3, can find out:

1. handling process aspect:

(1) need carry out pattern discrimination.

(2) need to adopt diverse ways to handle to different mode.Therefore, whole process is more loaded down with trivial details, realizes it not being very convenient.

2. execution performance aspect:

(1) time diversity of considering HARQ gains, and carry out HARQ earlier and handle, and then Turbo decoding.

(2) HARQ processing and Turbo decoding are separate, and order is complete.Therefore, HARQ handles and Turbo decoding is separately considered, systematic function does not have to such an extent that improve to the limit.

Summary of the invention

The purpose of this invention is to provide a kind of new mixing automatic retransmission processing method.

For realizing above-mentioned purpose, a kind of mixing automatic retransmission processing method comprises step:

Judge according to re-transmission sequence number RSN whether the data that receive are the new data of first emission;

If new data is separated the rate-matched module new data is separated rate-matched, then, the Turbo decoding module is deciphered separating the rate-matched data, and the data of output decoding;

If the data that receive are HARQ data retransmissions of last Transmission Time Interval TTI transmission data; Mixing is separated rate-matched module calculating mixing and is separated data; Then, the soft merging module of Turbo is carried out Turbo soft decoding and soft merging to the HARQ data and the blended data of transmission several times;

Soft information data to obtaining is carried out hard decision, obtains final data result.

The present invention integrates the processing of three kinds of HARQ patterns, has formed the processing procedure of unified unanimity, does not need to carry out pattern discrimination and differentiating and processing again, mixes the clear simplification of handling process that retransmits automatically, is easy to final realization.Compare with traditional scheme; The present invention handles HARQ and Turbo decoding is handled as a whole; In conjunction with Turbo soft decoding information processing gain and HARQ time diversity merging gain, the entire system retransmission efficiency is well improved and is improved with the performance that retransmits merging.

Description of drawings

Fig. 1 is the basic process of traditional HARQ scheme;

Fig. 2 is in the basic process of traditional HARQ scheme: IR-combining functions of modules structure;

Fig. 3 is in the basic process of traditional HARQ scheme: Chase-combining functions of modules structure;

Fig. 4 is the processing procedure of new HARQ scheme;

Fig. 5 is in the processing procedure of new HARQ scheme: Hybrid de-rate-matching functions of modules structure;

Fig. 6 is in the processing procedure of new HARQ scheme: Turbo soft combining functions of modules structure;

Fig. 7 is the performance simulation curve: the performance of new HARQ scheme and traditional HARQ scheme is (embodiment 1) relatively;

Fig. 8 is the performance simulation curve: the performance of new HARQ scheme and traditional HARQ scheme is (embodiment 2) relatively;

Fig. 9 is the performance simulation curve: the performance of new HARQ scheme and traditional HARQ scheme is (embodiment 3) relatively.

Embodiment

Like Fig. 4, Fig. 5 and shown in Figure 6.At first, this scheme is considered to have carried out designing again and optimizing from the handling process aspect to the problem described in 1.2 joints; The processing of three kinds of HARQ patterns is integrated; Formed the processing procedure of unified unanimity,, do not needed to carry out again pattern discrimination and differentiating and processing like Fig. 4 and shown in Figure 5; Process simplification is easy to final realization.

Then; This scheme is to the problem described in the 1st joint; Consider to have carried out Processing Structure transformation and upgrading from the execution performance aspect, HARQ processing and Turbo decoding are handled as a whole, like Fig. 4 and shown in Figure 6; In conjunction with Turbo decoding processing gain and time diversity transmission gain, entire system treatment effeciency and performance are well improved and are improved.

The method for designing of whole proposal is following:

At first judge whether HARQ new data for receiving data,, carry out Turbo decoding then and obtain final judgement output Output data as a result if new data is then directly separated rate-matched to Current data into first emission;

If not new data but the HARQ data that retransmit; Be the sort of HARQ pattern then no matter current system adopts; At first; Utilize Hybrid de-rate-matching module with the data Current data of current re-transmission and the unified mixing that superposes of HARQ data Previous data of preceding transmission several times, form the Hybrid de-data of a unanimity;

Then, utilize Turbo Soft combining module HARQ to be handled and Turbo decoding processing as a whole, the HARQ data of transmitting several times and mixing are carried out Turbo soft decoding and soft merging, calculate soft information data Combined soft bits;

At last, the soft information data that obtains is carried out hard decision and finally exported Outputdata as a result.

Fig. 4 has described the overall workflow of the automatic retransmission process scheme of new mixing:

(1) judges according to RSN (re-transmission sequence number) whether receive data is the new data of first emission;

(2), utilize Turbo decoding module to carry out Turbo decoding then if new data at first utilizes the De-rate-matching module to separate rate-matched;

(3) if not new data; But the HARQ data retransmission of a last TTI (Transmission Time Interval) transmission data; At first utilize Hybrid de-rate-matching module to calculate Hybrid de-data, utilize Turbo Soft combining module that the HARQ data and the blended data of transmission are several times carried out Turbo soft decoding and soft merging then;

(4) the soft information data Combined soft bits that obtains is carried out hard decision and finally exported Output data as a result.

Wherein:

The De-rate-matching module: the inverse operation of transmitting terminal rate-matched, separate punching according to transmitting terminal punching Punctuating with the pattern that repeats Repetition and conciliate repetitive operation.

Turbo decoding module: the inverse operation of transmitting terminal Turbo chnnel coding, decode procedure.

Fig. 5 has described the functional structure of Hybrid de-rate-matching module:

(1) data Current data that current TTI is received and the transmission data Previous data of previous TTI utilize the De-rate-matching module to separate rate adaptation operating respectively; Data are struck off irreclaimable position mark for " null ".

(2) carry out repetitive operation according to the data length of separating rate-matched output, each data is unified to mix reconstruction calculations Hybrid de-data.

(3) if Current de-data=null and Previous de-data=null, Hybrid de-data=null;

=null carries out the high specific joint account with Currentde-data and Previous de-data based on SNR or SINR and obtains Hybrid de-data;

(5) if among Current de-data and the Previous de-data one be null, another one is non-null, gives Hybrid de-data with the data of non-null wherein.

Fig. 6 has described the functional structure of Turbo Soft combining module:

(1) LLR (log-likelihood ratio) that utilizes Turbo LLR computation module to carry out Turbo soft decoding and information bit data respectively to Current de-data, Previous de-data and Hybrid de-data calculates, and obtains soft information data separately.

(2) with relevant HARQ data: the Hybrid soft bits of the Current soft bits of current TTI, the Previous soft bits of previous T TI and mixing combines and carries out the soft merging of high specific, calculates Combined soft bits.

In order to analyze and verify the algorithm of carrying, in the WCDMA system, carried out realization and emulation to varying environment:

Embodiment 1:

The WCDMA system, fc=2GHz, fs=3.84Mbps, TTI=2ms, HARQ retransmit interval 4 * TTI, QPSK, 1/2Turbo coding, Turbo iterations 4, rayleigh fading channel, speed of a motor vehicle 3km/h.Concrete comparative result is seen Fig. 7.

Embodiment 2:

The WCDMA system, fc=2GHz, fs=3.84Mbps, TTI=2ms, HARQ retransmit interval 4 * TTI, QPSK, 1/2Turbo coding, Turbo iterations 4, rayleigh fading channel, speed of a motor vehicle 60km/h.Concrete comparative result is seen Fig. 8.

Embodiment 3:

The WCDMA system, fc=2GHz, fs=3.84Mbps, TTI=2ms, HARQ retransmit interval 4 * TTI, QPSK, 1/2Turbo coding, Turbo iterations 4, rayleigh fading channel, speed of a motor vehicle 120km/h.Concrete comparative result is seen Fig. 9.

Claims

1. one kind is mixed re-transmission HARQ processing method automatically, comprises step:

Soft information data to obtaining is carried out hard decision, obtains final data result;

Wherein said mixing is separated the rate-matched module and calculate to be mixed and to separate data and comprise:

Data that current TTI is received and the transmission data of previous TTI are utilized respectively and are separated the rate-matched module and separate rate adaptation operating;

Data length according to separating rate-matched output carries out repetitive operation, each data is unified to mix the reconstruction calculations mixing separate data;

The soft merging module of said Turbo to several times the transmission the HARQ data and blended data is carried out the Turbo soft decoding and soft merging comprises:

To currently separating data, previously separating data and mixing and separate data and utilize the Turbo logarithm likelihood ratio calculating module to carry out the log-likelihood calculations of Turbo soft decoding and information Bit data respectively, obtain soft information data separately;

The soft information Bit data of the current soft information Bit data of current TTI, the previous soft information Bit data of previous TTI and mixing are combined carry out the soft merging of high specific, calculate soft merging data.

2. method according to claim 1 is characterized in that said calculating mixes to separate data and comprise:

If current data=null and the previous data=null that separates of separating then mixes and separates data=null.

3. method according to claim 1 is characterized in that said calculating mixes to separate data and comprise:

If current data of separating!=null and previous data of separating!=null separates the current data and previous of separating data and carries out the high specific joint account based on signal to noise ratio or Signal to Interference plus Noise Ratio and obtain mixing and separate data.

4. method according to claim 1 is characterized in that said calculating mixes to separate data and comprise:

If the current data and previous of separating are separated in the data one and are null, another one is non-null, and then wherein the data of non-null are given mixing and separated data.