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Multi-cell joint transmission method

A joint transmission, multi-cell technology, applied in diversity/multi-antenna systems, space transmit diversity and other directions, can solve the problem of consuming large system resources, save system resources, improve communication quality, and reduce signaling overhead.

Inactive Publication Date: 2009-12-09
BEIJING UNIV OF POSTS & TELECOMM +1
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AI Technical Summary

Problems solved by technology

[0006] CoMP technology means that multiple cells jointly perform data transmission for a mobile station. The communication between each cell participating in the CoMP technology and the mobile station is in a closed-loop form, and the mobile station needs to perform reverse channel information status with multiple cells. Feedback, consumes a lot of system resources

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Embodiment Construction

[0032] In order to make the purpose, technical means and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] The basic idea of ​​the present invention is: for a UE at the edge of a cell, multiple base stations use the same frequency band to send data to the UE, some base stations send data in an open-loop manner, and other base stations send data in a closed-loop manner. In this way, inter-cell interference is used to obtain diversity gain for data transmission, while avoiding the introduction of a large number of feedback channels and feedback information, thereby saving system resources.

[0034] Specifically, in the present invention, a mobile station at the edge of a cell establishes information transmission connections with multiple base stations at the same time, and each base station simultaneously transmits information to the mobile station at the edge of the...

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Abstract

The invention discloses a multi-cell joint transmission method. The method comprises the following steps that a mobile platform and a plurality of base stations establish data transmission channels at the same time, and the base stations transmit identical data to be transmitted to UE at same frequency; during the data transmission, part base stations transmit data in a closed loop mode accordingto precoding information fed back by the UE, while other base stations transmit data in an open-loop diversity mode; moreover, the precoding information fed back by the UE is determined by each base station establishing a data channel with the UE and channel characteristic between the UE. The multi-cell joint transmission method can obtain diversity gain, improve communication quality of subscribers on cell brims and save system resources at the same time.

Description

technical field [0001] The invention relates to the data transmission technology of cell edge users, in particular to a multi-cell joint transmission method. Background technique [0002] In a wireless communication system, inter-cell interference is an important factor that degrades communication quality of cell edge users. For the user in the center of the cell, the distance between itself and the base station is relatively close, while the distance of the interference signal in the outer cell is relatively long, and the signal-to-interference-noise ratio is relatively large. For the users at the edge of the cell, since the users occupying the same bandwidth resource in the adjacent cell have greater interference to it, and they are far away from the base station, their signal-to-interference-noise ratio is relatively small, resulting in that although the overall throughput of the cell is high, but Users at the edge of the cell have poor service quality and low throughput...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/02H04B7/04
Inventor 李立华张平王骥冉静周华
Owner BEIJING UNIV OF POSTS & TELECOMM
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