CN101771433A - Distribution method and system for midamble in space division multiple address (SDMA) system - Google Patents

Abstract

The invention is suitable for the field of mobile communication, and provides a distribution method and a system for midambles in a SDMA system. The method comprises the following steps: acquiring the number of SDMA users in the system; distributing different midamble deviations to each SDMA user according to the number of users; and indicating the distributed midamble deviations to the SDMA users. By using the method, different midamble deviations are distributed to the SDMA user, and the distributed midamble deviations are indicated to the SDMA users, thereby reducing the midamble code interferences among the SDMA users and enhancing the estimated quality of SDMA user channels.

Description

The distribution method of training sequence and system in a kind of space division multi-access

Technical field

The present invention relates to mobile communication system, relate in particular to the distribution method and the system of training sequence in a kind of space division multi-access (hereinafter to be referred as midamble).

Background technology

SDMA (Spatial Division Multiplex Access, space division multiple access) technology is utilized the different channel of space segmentation formation between different user, the multiplexing identical physical resource of the user of spatial separation, thus reach the purpose that improves the mobile communications network capacity.

According to the existing protocol requirement, in order to support multi-user HSDPA (High Speed Downlink PackagesAcces, high speed downlink packet inserts) business, the HSDPA system generally adopts training sequence (hereinafter to be referred as the midamble) allocative decision of acquiescence.The midamble sign indicating number allocative decision of acquiescence is meant that UE produces the midamble skew according to the channel code that distributes, for each comprises the independently midamble skew of channel code set of dispense from the channel code set of advocating peace.Obviously, for SDMA user,, also just can only adopt identical midamble skew owing to adopted identical channel code.

But in actual applications, each SDMA user can bring inter-user interference because of reasons such as signal power leakages.If each SDMA user adopts identical midamble skew, the midamble sign indicating number of its reception will inevitably be subjected to the pollution of other SDMA users' midamble sign indicating number.The main effect of midamble sign indicating number has channel estimating, power control and adjustment synchronously.Therefore, contaminated its channel estimating quality that will cause of each SDMA user's midamble sign indicating number descends.

Summary of the invention

The object of the present invention is to provide the distribution method of training sequence in a kind of space division multi-access, be intended to solve under the prior art, the easily contaminated problem that causes each SDMA subscriber channel estimated quality to descend of SDMA user's midamble sign indicating number.

The present invention is achieved in that the distribution method of training sequence in a kind of space division multi-access, and described method comprises:

Obtain the SDMA number of users in the system;

Distribute different training sequence deviation for each SDMA user according to the SDMA number of users that obtains;

Respectively described different training sequence deviation is indicated SDMA user to correspondence.

Another object of the present invention is to provide the distribution system of training sequence in a kind of space division multi-access, described system comprises:

The number of users acquiring unit obtains the SDMA number of users in the system;

The training sequence allocation units distribute different training sequence deviation according to the number of users that obtains for each SDMA user;

The training sequence indicating member indicates the training sequence deviation of distributing to SDMA user.

The invention has the beneficial effects as follows: distribute different midamble skews by giving each SDMA user, and give SDMA user with the midamble skew indication that distributes, thereby the midamble sign indicating number that reduces between each SDMA user disturbs, and improves each SDMA subscriber channel estimated quality.

Description of drawings

Fig. 1 is the flow chart of the distribution method of training sequence in a kind of space division multi-access of providing of the embodiment of the invention;

The graph of a relation of training sequence and channel code when Fig. 2 is the maximum number K=8 of the operable training sequence deviation that provides of prior art;

The graph of a relation of training sequence and channel code when Fig. 3 is the maximum number K=8 of the operable training sequence deviation that provides of the embodiment of the invention;

Fig. 4 is the structure chart of the distribution system of training sequence in a kind of space division multi-access of providing of the embodiment of the invention.

Embodiment

In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.

In embodiments of the present invention, distribute different midamble skews by giving each SDMA user, and give SDMA user, thereby the midamble sign indicating number that reduces between each SDMA user disturbs, and improves each SDMA subscriber channel estimated quality the midamble skew indication that distributes.

Fig. 1 shows the distribution method of training sequence in a kind of space division multi-access that the embodiment of the invention provides.In embodiments of the present invention, but the TD-SCDMA mobile communication system is determined the midamble group according to the resource of the maximum SDMA number of users of system assignment and SDMA; But be that identical channelization code resource is distributed one group of midamble promptly, a plurality of midamble skews are arranged among one group of midamble according to the maximum SDMA number of users of system assignment and the resource of SDMA.Specifically can comparison diagram 2 and Fig. 3, when the number of the channel code that is used for SDMA is less than the maximum number of midamble skew, promptly at channel code be

Perhaps

Perhaps

The time, with the corresponding channel code of a plurality of midamble skews.

In step S101, obtain the SDMA number of users in the system;

Obtain in esse SDMA number of users in the system.

In step S102, distribute different midamble skews for each SDMA user according to the number of users that obtains;

In step S103, the training sequence deviation of distributing is indicated to SDMA user.

Physical layer by system indicates the training sequence deviation of distributing to each SDMA user; What promptly indicate each SDMA user's employing is which midamble skew of a plurality of midamble skews in the midamble group.

The indicating mode of the midamble skew that each empty user of branch adopts can have following two kinds:

--in the interior midamble skew indication bit position that increases of High-Speed Shared Control Channel (High-Speed Shared Control Channel is hereinafter to be referred as HS-SCCH), which midamble skew by the concrete employing of indication bit position indication SDMA user is; Or

--when the SDMA number of users is 2, can by user ID identification number in the HS-SCCH channel whether the mode of negate indicate the concrete midamble skew of adopting of the empty user of branch.

In another embodiment of the present invention, having the SDMA number of users under the TD-SCDMA HSDPA system is 2, and the distribution method of Midamble during the skew maximum number K=8 of operable training sequence.During the skew maximum number K=8 of operable training sequence, the relation of midamble and channel code as shown in Figure 3 in embodiments of the present invention.The distribution method concrete steps of Midamble are as described below:

Step 1: obtain the SDMA number of users;

SDMA user's number is 2 in the present embodiment;

Step 2: for above-mentioned 2 SDMA users specify the skew of midamble sign indicating number;

In Fig. 3, SDMA user's channel code can be among the figure

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Perhaps

Channel code, correspondence can use the m in the midamble group ⁽¹⁾And m ^{(2) *}The skew of midamble sign indicating number is assigned to above-mentioned two SDMA users respectively;

Step 3: give each SDMA user with the midamble skew indication that distributes

Which midamble skew what indicate that each user uses by indicating mode is, this step has two kinds of attainable indicating modes, as step 3.1 and step 3.2;

Step 3.1: by the midamble skew whether negate indicates the user to use of ID users in the HS-SCCH channel.If user's ID users that demodulation obtains from the HS-SCCH channel is consistent with actual ID number, represent that then its midamble that uses skew is m ⁽¹⁾If the ID users that demodulation obtains just in time is actual ID negate, represent that then its midamble that uses skew is m ^{(2) *}Here it should be noted that in order to prevent that the empty user of branch from causing detecting conflict mutually on the contrary because of H-RNTI polarity, must limit the H-RNTI that all users distribute.Such as all H-RNTI are classified, be divided into two opposite polarity spaces, get final product in same space for the H-RNTI of each its original allocation of user.

Step 3.2: increase midamble indication bit position in the HS-SCCH channel, if this bit information that SDMA user obtains is 0, the midamble that expression is adopted is m ⁽¹⁾, otherwise be m ^{(2) *}

Fig. 4 shows the structure of the distribution system of training sequence in a kind of space division multi-access that the embodiment of the invention provides.For convenience of description, only show part related to the present invention here.This distribution system can be integrated in the TD-SCDMA mobile communication network, comprising:

Number of users acquiring unit 401 obtains the SDMA number of users in the system; Specifically as mentioned above.

Training sequence allocation units 402 distribute different training sequence deviation for each SDMA user according to the SDMA number of users that obtains; Specifically as mentioned above.

Training sequence indicating member 403 indicates the training sequence deviation of distributing to SDMA user.Specifically as mentioned above.

The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (5)

1. the distribution method of training sequence in the space division multi-access is characterized in that described method comprises:

Obtain the SDMA number of users in the system;

Distribute different training sequence deviation for each SDMA user according to the SDMA number of users that obtains;

Respectively described different training sequence deviation is indicated SDMA user to correspondence.

2. the method for claim 1 is characterized in that, described training sequence deviation with distribution indicates the SDMA user to correspondence to be:

In High-Speed Shared Control Channel, increase the training sequence indication bit position of the training sequence deviation be used to indicate described distribution.

3. the method for claim 1 is characterized in that, when the SDMA number of users was 2, described training sequence deviation with distribution indicated the SDMA user to correspondence to be:

Indicate the training sequence deviation of described distribution by the user ID identification number in the High-Speed Shared Control Channel.

4. the method for claim 1 is characterized in that, the SDMA number of users that described basis is obtained distributes different training sequence deviation to be for each SDMA user:

When the number of the channel code that is used for SDMA is less than the maximum number of training sequence deviation, with corresponding respectively the different SDMA users of a plurality of training sequence deviation with same channelization codes.

5. the distribution system of training sequence in the space division multi-access is characterized in that described system comprises:

The number of users acquiring unit obtains the SDMA number of users in the system;

The training sequence allocation units distribute different training sequence deviation according to the number of users that obtains for each SDMA user;

The training sequence indicating member indicates the training sequence deviation of distributing to SDMA user.

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