SDMA protection method for small region marginal customer of HSDPA system

Abstract

The invention discloses a space division multiple access (SDMA) protection method of an edge user of a cell in an HSDPA system. The method comprises the following steps: A1. acquiring SDMA user information of the cell and recording reporting information of various users; and A2. judging whether any user is on the edge of the cell according to the reporting information of various users, if yes, executing the step A3; A3. deleting the user from an SDMA user collection and transmitting data for the user by a CDMA method. Therefore, when the SDMA user is on the edge of the cell and the signal is weak, the data is not transmitted by the SDMA method, which can ensure the signal quality and avoid occurrence of error blocks; when a non-SDMA user satisfies the condition of data transmission by the SDMA method, the non-SDMA user is added to the SDMA user collection, and the data is transmitted by the SDMA method for the user. The method has the advantages of flexible application, convenient implementation and effective protection for the signal quality of the edge user.

Description

technical field [0001] The present invention relates to a kind of SDMA (Spatial Division Multiple Access, space division multiple access) method of TDD (Time Division Duplexing, time division duplex) communication system, what relate in particular is, a kind of third generation mobile communication field HSDPA (High-Speed Downlink Packet Access, SDMA protection method for cell edge users of a high-speed downlink packet access) system. Background technique [0002] In the TD-SCDMA (Time Division Synchronous Code Division Multiple Access) HSDPA system of the prior art, array antennas are used, so that users can perform code multiplexing through space division, but there is a problem of random scheduling, resulting in The interference changes greatly, especially for users at the edge of the cell. Because the interference of adjacent cells is already relatively large, the interference caused by scheduling users located in different directions also changes greatly, so it is more ...

AI Technical Summary

Problems solved by technology

[0002] In the TD-SCDMA (Time Division Synchronous Code Division Multiple Access) HSDPA system of the prior art, array antennas are used, so that users can perform code multiplexing through space division, but there is a problem of random scheduling, resulting in The interference changes greatly, especially for users at the edge of the cell. Because the interference of adjacent cells is already relatively large, the interference caused by scheduling users located in different directions also changes greatly, so it is more likely to have a change in the interference environment during two scheduling. In larger cases, this is not conducive to the stable tracking of CQI, especially when the user uses the SDMA mode, the power has been divided equally. If the interference of adjacent cells increases sharply at this time, it is likely to cause the transmission block to fail to receive

[0003] From another point of view, when the user is at the edge of the cell, the signal itself is relatively weak. If the SDMA method is used, the signal quality is likely to be difficult to guarantee, resulting in the occurrence of block errors.

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