Dynamic cooperation transmission method for OFDM mobile relay network

Abstract

The invention relates to a dynamic cooperative transmission method in OFDM mobile relay network and a reuse greedy resource allocation algorithm adopted in the method. The cooperative transmission can realize the parallel transmission of a plurality of BS / RS in an OFDM signal synchronous and realize the resource reuse between BS and RS. By adopting the reuse greedy resource allocation algorithm, the resource is reused in the maximum degree on one hand, and the problem of pilot frequency collision is solved on the other hand, thus avoiding unusable and vacant resource caused by the pilot frequency collision and realizing high efficient utilization of the resource.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to a dynamic cooperative transmission method in an OFDM mobile relay network and a reuse greedy resource allocation algorithm adopted in the method. Background technique [0002] In the IMT-Advance mobile communication system, the frequency band from 3.4GHZ to 3.6GHz will be used. Compared with the frequency band from 1.8GHz to 2.3GHz used in the 3G mobile communication system, the frequency is much higher and the path loss will be greatly increased. In order to overcome the problem of shrinking cell coverage caused by the increase of path loss. As a coverage extension technology, mobile relay has been studied more and more. Mobile relay is a method that can effectively expand the coverage of wireless networks and improve system throughput. Generally, RS (relay station) is much less complex than BS (base station). Therefore, when certain system coverage and throughput requirement...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for dynamic cooperative transmission in an OFDM mobile relay network. The present invention uses dynamic cooperative transmission on the BS base station and RS relay station to solve the problem of pilot collision. If the first group of terminals is between the base station BS and the relay station In the overlapping coverage area of ​​the RS, the second group of terminals is only in the coverage area of ​​the BS, then during the parallel transmission process of the BS and the RS in the same OFDM symbol, the BS transmits the pilot, the data of the first group of terminals, and all The data of the second group of terminals, the RS transmission pilot and the data of the first group of terminals; the data of the first group of terminals and the data of the second group of terminals are transmitted in different data sub-channels, by The scheduler on the BS determines

[0007] The purpose of the present invention is to provide a method for dynamic cooperative transmission in an OFDM mobile relay network. The present invention uses dynamic cooperative transmission on the BS base station and RS relay station to solve the problem of pilot collision. If the first group of terminals is between the base station BS and the relay station In the overlapping coverage area of ​​the RS, the second group of terminals is only in the coverage area of ​​the RS, then in the parallel transmission process of the BS and the RS in the same OFDM symbol, the BS transmits the pilot and the data of the first group of terminals, and the RS transmitting the pilot, the data of the first group of terminals and the data of the second group of terminals; the data of the first group of terminals and the data of the second group of terminals are transmitted in different data sub-channels, by The scheduler on the BS determines

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