METHOD AND APPARATUS FOR SEQUENCE DISTRIBUTING AND SEQUENCE PROCESSING IN COMMUNICATION SYSTEM

• US 20090186625A1
• Filed: 03/27/2009
• Published: 07/23/2009
• Est. Priority Date: 09/30/2006
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: HE, Yujuan, QU, Bingyu
• Granted Patent: US 9,294,245 B2
• Time in Patent Office: Days
• US Class Current: 455/450
• CPC Class Codes: H04J 13/0062 Zadoff-Chu
• CPC Class Codes: H04J 13/22 Allocation of codes with a zero correlation zone
• CPC Class Codes: H04L 23/02 adapted for orthogonal signalling
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 5/0005 Time-frequency
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0062 Avoidance of ingress interference, e.g. ham radio channels
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

A sequence distributing and sequence processing method and apparatus in a communication system are provided. The sequence distributing method includes the following steps: generating sequence groups including a number of sequences, the sequences in the sequence groups are determined according to the sequence time frequency resource occupation manner which is supported by the system; distributing the sequence groups to cells. The method avoids the phenomenon that signaling transmission is needed to distribute the sequences to the cells for different time frequency resource occupation manner, and saves in so far as possible the wireless network transmission resource occupied during the process of distributing the sequences through distributing the sequence groups comprising a number of sequences to the cells.

Claims

1. A method for allocating sequences in a communication system, comprising:

generating a sequence group comprising a plurality of sequences, wherein the sequences in the sequence group are determined according to occupation modes of time-frequency resources of the sequences supported in the system; and

allocating the sequence group to a cell.

2. The method according to claim 1, wherein the occupation modes of time-frequency resources of the sequences at least comprise one of following modes:

different sequences occupy the time-frequency resources having different bandwidths;

different sequences occupy the time-frequency resources having different sampling intervals; and

different sequences occupy the different positions of time-frequency resource blocks.

3. The method according to claim 1, wherein the sequences in the sequence group at least comprises one of the following:

constant amplitude zero auto-correlation (CAZAC) sequence, a fragment of CAZAC sequence, and the sequence obtained through combining a CAZAC sequence with a segment of a CAZAC sequence.

4. The method according to claim 3, wherein the CAZAC sequence is a Zadoff-Chu sequence.

5. The method according to claim 3, wherein the generating a sequence group comprising a plurality of sequences specifically comprises:

when the occupation mode of time-frequency resources of the sequence is different sequences occupying the time-frequency resources having different sampling intervals s₁, s₂, performing sampling having intervals of s₁ and s₂ on the sequence corresponding to the time-frequency resources that are sampled, and taking two sequences a_{(si)mod M}, i=0, 1, . . . , M−

1, s=s₁, s₂ obtained through the sampling as the sequences in a sequence group;

or

when the three occupation modes of time-frequency resources respectively correspond to a first sequence a, a second sequence b and a third sequence c, the length of the third sequence c is larger than that of the first sequence a and that of the second sequence b respectively, and the third sequence c is a product of the first sequence a and the second sequence b, taking the third sequence c and one of the first sequence a and the second sequence b as sequences in the sequence group.

6. The method according to claim 4, wherein the generating a sequence group comprising a plurality of sequences specifically comprises:

when the time-frequency resources occupied by the two sequences are the time-frequency resources having the same bandwidth that are obtained through performing samplings having different intervals, and when indexes of the two sequences are directly proportional to the square of the corresponding sampling intervals, taking the two sequences as the sequences in a sequence group;

or

when the occupation mode of time-frequency resources of the sequence is different sequences occupying the time-frequency resources having different bandwidths, taking the two sequences occupying the time-frequency resources having different bandwidths that are generated according to indexes r_i=b_i·

k+δ

_i, i=1, 2 as the sequences in a sequence group;

wherein the same k indicates the same sequence group, b_i, δ

_i are determined by the time-frequency resources having different bandwidths occupied by user, and i=1, 2 differentiates different time-frequency resources.

7. The method according to claim 6, wherein the generating a sequence group comprising a plurality of sequences further comprises:

determining b₁, b₂ according to an equation b₁·

N₂−

b₂·

N₁=1, where N₁, N₂ represents lengths of the different sequences respectively.

8. The method according to claim 1, wherein the generating a sequence group comprising a plurality of sequences further comprises:

when the occupation modes of time-frequency resources of the sequences are classified into several classes, constituting a corresponding sequence group for the occupation modes of time-frequency resources of the sequence in each class.

9. The method according to claim 1, wherein the determining the sequences in the sequence group according to an occupation mode of time-frequency resources of the sequence supported in the system specifically comprises:

constituting, by the sequences having relatively high correlation between each other, a sequence group when the corresponding time-frequency resources are occupied.

10. The method according to claim 1, wherein the allocating the sequence group to a cell specifically comprises:

allocating the sequence group to the cell in a pseudo random mode.

11. The method according to claim 10, wherein the allocating the sequence group to the cell in a pseudo random mode specifically comprises:

allocating the sequence group to the cell in the pseudo random mode specific to the cell, or in the pseudo random mode specific to a cell group.

12. A method for sequence processing in a communication system, comprising:

determining information of a sequence group allocated to a cell;

determining the sequence generation information from the information of the sequence group according to the occupation mode of time-frequency resources of the sequence;

generating the sequence according to the sequence generation information; and

performing sequence processing on the sequence generated.

13. The method according to claim 12, wherein the occupation mode of time-frequency resources of the sequence at least comprises one of following modes:

different sequences occupy the time-frequency resources having different bandwidths;

different sequences occupy the time-frequency resources having different sampling intervals; and

different sequences occupy the different positions of time-frequency resource blocks.

14. The method according to claim 12, wherein the determining information of a sequence group allocated to a cell specifically comprises:

determining the information of the sequence group allocated to the cell according to identification information of the cell and/or identification information of the sequence group.

15. The method according to claim 12, wherein the sequence at least comprises one of following sequences:

constant amplitude zero auto-correlation (CAZAC) sequence, a fragment of CAZAC sequence, and the sequence obtained through combining a CAZAC sequence and a fragment of a CAZAC sequence.

16. The method according to claim 15, wherein the CAZAC sequence is Zadoff-Chu sequence.

17. The method according to claim 15, wherein the determining sequence generation information from the information of the sequence group specifically comprises:

when the occupation modes of time-frequency resources of the sequence are the different sequences occupying the time-frequency resources having different sampling intervals, determining the sequence that needs to be generated is the sequences a_{(si)mod M}, i=0, 1, . . . , M−

1 obtained through performing sampling having the interval of s on a sequence a_i, i=0, . . . , M−

1 corresponding to the time-frequency resources having the sampling interval of 1;

or

when the three occupation modes of time-frequency resources respectively correspond to a first sequence a, a second sequence b and a third sequence c, the length of the third sequence c is larger than that of the first sequence a and that of the second sequence b respectively, and the third sequence c is a product of the first sequence a and the second sequence b, taking the third sequence c or one of the first sequence a and the second sequence b as the sequence that needs to be generated.

18. The method according to claim 16, wherein the determining sequence generation information from the information of the sequence group specifically comprises:

when the time-frequency resources occupied by at least two sequences are the time-frequency resources having the same bandwidth that are obtained through performing samplings having different intervals, and when indexes of the two sequences are directly proportional to the square of the corresponding sampling intervals, taking one of the two sequences as the sequence that needs to be generated;

or

when the bandwidth of time-frequency resources occupied by a sequence is different from the bandwidth of time-frequency resources occupied by other sequences in the sequence group, generating sequences according to the index r_i=b_i·

k+δ

_i, i=1, 2;

wherein when k is the same, the sequences belong to the same sequence group, b_i, δ

_i are determined by the time-frequency resources having different bandwidths occupied by a user, and i=1, 2 differentiates different time-frequency resources.

19. A wireless communication apparatus for signal processing, comprising:

a cell sequence determining unit, adapted to determine information of sequence group allocated to a cell;

a time-frequency resource sequence determining unit, adapted to determine the sequence generation information from the information of sequence group according to the occupation mode of time-frequency resources of the sequence;

a sequence generating unit, adapted to generate the sequence according to the sequence generation information; and

a processing unit, adapted to perform sequence processing on the sequence generated.

20. The apparatus according to claim 19, wherein the cell sequence determining unit comprises:

a module adapted to determine the information of sequence group allocated to the cell according to identification information of the cell and/or identification information of the sequence group.