WO2008022503A1

WO2008022503A1 - A method for assigning an automatic repeat request acknowledgement indicator channel in a time division-synchronous code division multiple access (td-scdma ) system

Info

Publication number: WO2008022503A1
Application number: PCT/CN2006/003814
Authority: WO
Inventors: Hu Liu; Hua Rui; Peng Geng; Yincheng Zhang; Hui Chen; Weiwei Yin
Original assignee: Zte Corporation
Priority date: 2006-08-18
Filing date: 2006-12-31
Publication date: 2008-02-28
Also published as: CN101127535B; CN101127535A

Abstract

A method for realizing an automatic repeat request acknowledgement indicator channel (E-HICH ) in a Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system. Said method comprises the following steps: a system generates sequence codes which are used for firstly spreading (101); the system selects corresponding sequence codes for the data determined by a linking layer, and spreads them firstly (101); the system modulates and sums the data which is spread firstly (103, 104), and spreads secondly and scrambles the summed data (105); the system arranges the data which is spread secondly and scrambled according to a defined structure of time intervals for the automatic repeat request acknowledgement indicator channel (106). Said method could ensure the correctly receiving of information and save the resources of downlink channel.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time division synchronous code division multiple access system, and more particularly to a HSUPA (High Speed Uplink Packet) in a time division synchronous code division multiple access system. The automatic retransmission response of Access) indicates the channel implementation method. BACKGROUND OF THE INVENTION In the third generation mobile communication system, in order to provide higher rate uplink packet services and improve spectrum utilization efficiency, 3GPP (3rd Generation Partnership Project) introduces high speed uplink packet access in specifications of WCDMA and TD-CDMA systems. (HSUPA: High Speed Uplink Packet Access) feature, that is, uplink enhancement.

The HSUPA system is also known as the Uplink Enhancement System (E-DCH). In the TD-CDMA system, the physical layer of the HSUPA system introduces an E-PUCH physical channel for transmitting an E-DCH type CCTrCH (Coded Synthetic Transport Channel). The newly introduced downlink signaling channel is an E-DCH absolute grant channel (E-AGCH: E-DCH absolute grant channel) and an E-DCH HARQ Acknowledgement indicator channel (E-HICH: E-DCH HARQ Acknowledgement indicator channel), where E- The AGCH is used to transmit the authorization information; the E-HICH is used to carry the uplink E-DCH HARQ indication information. Since the E-HICH carries the uplink E-DCH HARQ indication information, it is desirable to ensure that the information is correctly received, and the downlink code channel resources are saved. However, in the prior art, it is impossible to ensure correct reception of the information and save downlink code channel resources. SUMMARY OF THE INVENTION To overcome the deficiencies and deficiencies of the prior art, it is an object of the present invention to provide an automatic retransmission response indication channel implementation method for a time division synchronous code division multiple access system capable of ensuring correct reception of information and saving downlink code channel resources. In order to achieve the above object, an automatic retransmission response indication channel implementation method for a time division synchronous code division multiple access system according to the present invention comprises the following steps:

(1) The system generates a first spread spectrum sequence code; (2) The system selects its corresponding first spreading sequence code for the data confirmed by the link layer and performs the first time

(3) The system modulates and superimposes the data obtained by the first spread spectrum, and performs super-spreading and scrambling of the superposed data on the channel;

(4) The system arranges the data obtained by the second spread spectrum scrambling according to the set automatic retransmission response indication channel slot structure. As a further improvement of the present invention, the first spreading code sequence includes a 20 X 20 Hadam code sequence 歹 ij and a 4 X 4 quasi JE cross code sequence ll ll. As a further improvement of the present invention, the first spreading code sequence comprises a 20 x 20 Hada code sequence and a 4 x 4 Hada code sequence. As a further improvement of the present invention, the step (2) is specifically:

( 21A ) The system is based on the formula ^ - ^^ + ^. Selecting the first spreading code sequence with α _Λ ^目

S2, v ^{= s} i,k ® C ₂ , _Lm , j = rmod4; performing the first spreading on the t _h ; . Minimum code channel number _"¾ where the ί, where t is the smallest uplink enhanced dedicated channel slot number, the sequence number r is always the first spreading code sequence, said _1;. For the diffuser The sequence obtained by frequency, the sequence obtained by spreading, the data confirmed by the link layer of the first spreading, the h being an integer less than or equal to 24, and the C _l is 20 X 20 The i-th row sequence in the Hada code sequence, the C _{2J m} is a sequence of the j-th row in the 4 X 4 quasi-orthogonal code sequence, and the k is a code of the code in the i-th row of the 20 X 20 Hada code sequence The m is the number of codes in the jth row of the 4×4 quasi-orthogonal code sequence, and the i is the row number of the line required for spreading in the 20×20 Hada code sequence, where j is 4 X 4 The number of lines in the sequence required for spreading in the quasi-orthogonal code sequence. As a further improvement of the present invention, the step (2) is specifically:

(21B) The system performs a Cartesian product of the 20 X 20 Hada code sequence and the 4x4 Hada code sequence to obtain an 80 X 80 first spreading code sequence;

(22B) The system is based on the formula r-16t. + (.- 1) Select the first spreading code sequence corresponding to " _A ";

(23B) The system first _{spreads the} a _h into the 4 通过 by the formula S ₂ , q = a _h ® C ₃ , _iq ; For β _3⁄4 where t. The minimum code channel number, where t _Q is the minimum time slot number of the uplink enhanced dedicated channel where a _h is, the r is the total sequence number of the first spreading code sequence, and the _q is obtained by spreading the frequency of a _h a sequence, the a _h is data confirmed by the link layer, the h is an integer less than or equal to 24, and the C ₃ is an ith row sequence in the 80 X 80 first spreading code sequence, the q It is the number of codes in the i-th row of the 80 X 80 first spreading code sequence, and the i is the row number of the lines required for spreading in the 80 X 80 first spreading code sequence. As a further improvement of the present invention, the step (3) is specifically:

(31) The system performs the four-phase phase shift keying signal modulation on all the data obtained by the first spreading; (32) the system performs weighted superposition of all the modulated data to obtain new data;

(33) The system performs the second spreading and scrambling of the channel by the weighted superimposed data. As a further improvement of the present invention, the h value is 8. As a further improvement of the present invention, the set HICH time slot structure is: two symbols are arranged between the data symbol and the training sequence, and the two symbols are 32 chips. As a further improvement of the present invention, after the step (4), the method further includes:

(5) The system issues the channel spreading sequences of the same time slot together. After adopting the above method, the function of the E-HICH code channel of the time division synchronous code division multiple access system is realized by two spread spectrums, thereby achieving the saving of the downlink channelization code resources and ensuring that the UE has a better function. Receive performance, so that the HARQ indication information of the E-DCH is efficiently and correctly received. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic diagram of an E-HICH frame structure of an HSUPA of a TD-SCDMA system according to the present invention; FIG. 2 is a flow chart of implementing an E-HICH channel of an HSUPA in a TD-SCDMA according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. As shown in FIG. 1 , it is a schematic diagram of an E-HICH frame structure according to the present invention. The present invention adopts a channelization code of SF 16 , and has a maximum bit capacity of 88 bits. Considering the structure of the first spreading code, 80 bits are used. The first spreading code, therefore, in order to reduce the interference of the first half of the data symbols Data symbols, the vacant 4 symbols (8 bits) are placed as GP bisects between the Midamble and the symbol data. The first half data symbol and the second half data symbol all include 40 bits, that is, 320 chips; the training sequence includes 144 chips, and there are 32 chips between the training sequence and the symbol data. The spreading code sequence used in the present invention has two modes: one is a construction method, and the construction method is constructed by using two code sets CI and C2, wherein C1 is a 20 X 20 Hadamard code matrix, and C2 is a 4 X 4 standard. Orthogonal code sequence. Table 1 and Table 2 are the CI and C2 code sequence sets, respectively.

k 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Ct,o,k 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Ci,i,k 1 0 0 1 1 0 0 0 0 1 0 1 0 1 1 1 1 0 0 1

Gl,2,k 1 0 1 1 0 0 0 0 1 0 1 0 1 1 1 1 0 0 1 0

Cl,3,k 1 1 1 0 0 0 0 1 0 1 0 1 1 1 1 0 0 1 0 0

Ci,4,k 1 1 0 0 0 0 1 0 1 0 1 1 1 1 0 0 1 0 0 1

^C 1,5,k 1 0 0 0 0 1 0 1 0 1 1 1 1 0 0 1 0 0 1 1

Ci,6,k 1 0 0 0 1 0 1 0 1 1 1 1 0 0 1 0 0 1 1 0

Cl,7,k 1 0 0 1 0 1 0 1 1 1 1 0 0 1 0 0 1 1 0 0

Ci,8,k 1 0 1 0 1 0 1 1 1 1 0 0 1 0 0 1 1 0 0 0

Ci,9,k 1 1 0 1 0 1 1 1 1 0 0 1 0 0 1 1 0 0 0 0

Cl,l0,k 1 0 1 0 1 1 1 1 0 0 1 0 0 1 1 0 0 0 0 1

Table 1

Table 2, in Table 2, there are other expressions (such as Table 2a, Table 2b), and the exchange of ranks to produce a new C2, also has the above characteristics.

Table 2a

Table 2b Another method can use the CI 20 χ 20 Hada code sequence and C4 is the 4 X 4 Hada code sequence for the Cartesian product. The direct acquisition of the 80 X 80 first spreading code sequence, where 20 x 20 Hada code The sequence is Table 1, and the 4 x 4 Hada code sequence is Table 3.

m 0 1 2 3

C2,0,m 1 1 1 1

table 3

The slot and code channel assignment relationship between the E-HICH code sequence and the E-DCH is as follows: r = 16t ₀ + (^ ₀ - l) (1) where r represents the total sequence number of the corresponding first spreading code sequence , r = [0,...,79]; t. The minimum E-DCH slot number occupied by the data for the kth UE, t. = [0,· · · , 4]; The time slot t in the E-DCH occupied by the data of the kth UE. The minimum code number, . = [1 ' , 16]. 2, the E-HICH channel oriented in TD-SCDMA HSUPA implementation process invention, is h ^ data to a _h, which corresponds to the h-th channel, the method according to the present invention comprises the steps of:

(101) generating a first spreading code sequence and according to equation (1) above. , . Selecting a corresponding first spreading code sequence r;

(102) performing a first spread of the data a _h ;

(103) performing modulation of QPSK (Quadrature Phase Shift Keying Signal) on the sequence obtained after the first spreading;

(104) performing weighted superposition on a plurality of QPSK-modulated sequences;

(105) performing channel spreading and scrambling on the data superimposed by the plurality of QPSK sequences, and the spreading factor is 16;

(106) arranging the data subjected to the spreading power σ interference according to the set HICH slot structure; (107) and the channel spreading sequence in the same time slot. There are two types of spreading methods in the above process: One method of spreading is to set the ACK/NACK data of the E-DCH to <3⁄4, and the first spreading method is: si, k = ^a h ® ^C , k , k=0,l,2, ....19 (2) S2,v = ^s x ® ^C 2 ,m ,v-0,l,...,79 (3) where , , Divide r by 4; j = rmod4 , which means that r is divided by 4 ears.

Another method of spreading is to set the ACK/NACK data of the E-DCH to first perform a krone product of CI and C4 to obtain a code sequence C3 of 80 x 80. The first spreading method is: q = a _h ^ ', q , q = 0, 1, 2, ..., 79 (4) where the weighted superposition process in step (104) is to force a channel sequence of less than or equal to 24. Weight stacking, using 8 channel sequences for force. Weight stacking is an optimal implementation of the invention. The invention realizes the function of the E-HICH code channel of the time division synchronous code division multiple access system by two-time spread spectrum, thereby achieving the advantages of saving the downlink channelization code resource and ensuring the UE has good reception performance, so that the E- The HARQ indication information of the DCH is efficiently and correctly received.

Claims

The invention provides a method for realizing an automatic retransmission response indication channel of a time division synchronous code division multiple access system, which is characterized in that it comprises the following steps:

(1) The system generates the first spread spectrum sequence code;

(2) The system selects its corresponding first spreading sequence code for the data confirmed by the link layer and performs the first spreading;

(3) The system modulates and superimposes the data obtained by first spreading, and performs super-spreading and scrambling of the superposed data on the channel;

(4) The system arranges the data obtained by the second spread spectrum scrambling according to the set automatic retransmission response indication channel slot structure. The method for implementing an automatic retransmission response indication channel according to the time division synchronous code division multiple access system according to claim 1, wherein the first spreading code sequence comprises a 20 x 20 Hada code sequence and a 4 X 4 quasi-orthogonal code. sequence. The method for realizing an automatic retransmission response indication channel of a time division synchronous code division multiple access system according to claim 1, wherein the first spreading code sequence comprises a 20x20 Hada code sequence Ρ^^4Χ4 石马^歹Ij. The method for implementing an automatic retransmission response indication channel of a time division synchronous code division multiple access system according to claim 2, wherein the step (2) is specifically:

(21A) The system selects the first spreading code sequence corresponding to ^a h according to the formula ^{r = l6t} o + ^_1 );

. _ r

( 22A ) The system passes the formula ^ ^{= 3⁄4 @ c} ' ^k , ^z_ ra.

^S 2,v ^{= S} l,k ® C _2J , _m j _{= rmo} d4. This is performed for the first time; For the smallest code channel number of ^, the ^ is ^ is the upstream increase The minimum slot number of the strong dedicated channel, the r is the total sequence number of the first spreading code sequence, the ^ ² ' ¹ ' is a pair, the sequence obtained by spreading, and the ^S1 ' ^k is the spreading spectrum for ^ah The obtained sequence is the data confirmed by the link layer of the first spread spectrum, and the h is an integer less than or equal to 24,

C r

The " ^k " is the ith row sequence in the 20 X 20 Hadamard code sequence, and the ² 'j' ^m is the j-th row sequence in the 4 X 4 quasi-orthogonal code sequence, and the k is 20 X 20 The number of codes in the i-th row of the Hada code sequence, the m is the number of codes in the j-th row of the 4 X 4 quasi-orthogonal code sequence, and the i is a 20 X 20 Hada code sequence expansion The line number of the desired line of the frequency, the j is the line number of the line required for spreading in the 4 X 4 quasi-orthogonal code sequence. The automatic retransmission response indication of the time division synchronous code division multiple access system according to claim 3. The channel implementation method is characterized in that: step (2) is specifically:

(21B) The system performs a Cartesian product of a 20 X 20 Hada code sequence and a 4 x 4 Hada code sequence to obtain an 80 X 80 first spreading code sequence;

(22B) The system is based on the formula ^{r = 16} . + (3⁄4Ό - select the first spreading code sequence corresponding to ^a h;

(23B) The system performs the first spreading by the formula ² 'q ― ^{h 3} , '', q; wherein, the minimum code channel number of ^ah is ^, and the ^ is the upper dedicated channel of ^ah The smallest slot number, the r is the total sequence number of the first spreading code sequence, the "^'q is the sequence obtained by spreading the ^ah , the data confirmed by the link layer, the h For an integer less than or equal to 24, the ^e3 , ', q is the ith row sequence in the 80 X 80 first spreading code sequence, and the q is the ith row in the 80 X 80 first spreading code sequence. The number of lines is the number of lines required for spreading in the 80 X 80 first spreading code sequence. The automatic retransmission response indicating channel of the time division synchronous code division multiple access system according to claim 4 or 5. The implementation method is characterized in that: step (3) is specifically:

(31) The system performs the four-phase phase shift keying signal modulation on all the data obtained by the first spread spectrum;

(32) The system performs weighted superposition of all the modulated data to obtain new data; (33) The system performs the second spreading and scrambling of the channel by the weighted superimposed data.

The method for implementing an automatic retransmission response indication channel of a time division synchronous code division multiple access system according to claim 4 or 5, wherein the h value is 8.

8. The method for implementing an automatic retransmission response indicator channel of a time division synchronous code division multiple access system according to claim 1, wherein the set HICH time slot structure is:

Two symbols are arranged between the data symbol and the training sequence, and the two symbols are 32 chips.

The method of implementing the automatic retransmission response indication channel of the time division synchronous code division multiple access system according to claim 1, wherein the step (4) further comprises:

(5) The system issues the channel spreading sequences of the same time slot together.