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Scheduling transmission method for collaborative cells against cell edge users of downlink

A cooperative cell and cell edge technology, applied in the field of communication, can solve the problem of less research on distributed joint transmission schemes, and achieve the effect of reducing error probability

Inactive Publication Date: 2011-09-21
XI AN JIAOTONG UNIV
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Problems solved by technology

However, research on distributed joint transmission schemes based on local CSI assumptions is still relatively small

Method used

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  • Scheduling transmission method for collaborative cells against cell edge users of downlink
  • Scheduling transmission method for collaborative cells against cell edge users of downlink
  • Scheduling transmission method for collaborative cells against cell edge users of downlink

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specific Embodiment approach

[0019] Below, we will introduce in detail the specific implementation of the proposed inter-cell cooperative scheduling transmission scheme based on the signal space diversity technology.

[0020] we order d k (t) represents t time slots of modulated data symbols from the QAM constellation S, which constitute k The kth data stream of , k=1,2. Unlike a typical MISO-IC channel, here we assume that the data to be sent to the two mobile stations is shared between the two base stations. This enables each receiver to obtain the data transmission service of two base stations through the cooperative precoding technology. Different from the distributed precoding scheme discussed before, the two base stations do not transmit data at the same time, but transmit data alternately in turn.

[0021] Step 1: Linear constellation precoding

[0022] At each transmitter, the modulation symbols are precoded through a linear constellation before being transmitted. Here, we make the modulation...

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Abstract

The invention discloses a scheduling transmission method for collaborative cells against cell edge users of a downlink. Under the transmission method provided by the invention, adjacent two base stations can collaboratively schedule the respective transmission based on an alternating data sharing protocol in which a signal space diversity technology is embedded, thereby enabling each base station to alternately perform data transmission and keep silence. Based on the realizable packet alternating data sharing way provided by the invention, inter-cell space diversity can be exploited and utilized in the form of the signal space diversity under the situation of local channel state information (CSI), thereby reducing the error probability of each data stream and further enabling an inter-cell link to turn from being harmful to being beneficial. By adopting the inter-cell collaborative scheduling scheme provided by the invention, the BER (bit error rate) performance of the two collaborative cells on the data downlink within a signal to noise ratio interval of actual work can be greatly upgraded.

Description

Technical field: [0001] The present invention generally relates to the communication field, and in particular to a wireless communication system and a coordinated cell scheduling transmission method for downlink cell edge users adopted by base stations of two coordinated cells in the wireless communication system. Background technique: [0002] In the wireless cellular communication system, the signal received by the cell edge users from the serving base station is weak and the signal from the adjacent cell base station is relatively strong, so the cell edge users will be affected by severe co-channel interference, and their reception The signal-to-interference-noise ratio of the signal is low, and the receiving performance is poor. The interference problem is especially serious when the frequency reuse factor is 1, which makes the entire system interference limited. Although the traditional diversity technology and relay technology can greatly improve the reliability of th...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/08
Inventor 徐静任品毅杜清河张超
Owner XI AN JIAOTONG UNIV
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