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Cross-layer scheduling with fairness for multi-user ofdm system:a restless bandit approach

The Journal of China Universities of Posts and Telecommunications 2011年第4期18卷 25-30页

作者： GE Wen-dong JI Hong LI Xi Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

In ofdm-based System such as long term evolution （LTE）, the scheduling scheme plays an essential role in not only improving the capacity of system, but also guarantee the fairness among the user equipments （UEs）. However, most existing work about scheduling only considers the current throughput in physical layer. Thus in this paper, a cross-layer scheduling with fairness based on restless bandit （CSFRB） scheme with the ＇indexability＇ property is proposed for the multi-user orthogonal frequency-division multiplexing （ofdm） system to minimize the distortion in the application layer, to maximize the throughput and to minimize the energy consumption in the physical layer. The scheduling problem is firstly established as a restless bandit problem, which is solved by the primal-dual index heuristic algorithm based on the first order relaxation with low complexity, to yield the CSFRB scheme. AdditionaUy, this scheme is divided into offiine computation and online selection, where main work will be finished in former one so as to decrease the complexity further. Finally, extensive simulation results illustrate the significant performance improvement of the proposed CSFRB scheme compared to the existing one in different scenarios.

关键词： multi-user ofdm scheduling cross-layer design restless bandits

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Optimal subcarrier allocation for cognitive radio with multi-user ofdm and distributed antenna

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Journal of Southeast University(English Edition) 2010年第4期26卷 513-517页

作者：葛文栋纪红司鹏搏李曦北京邮电大学泛网无线通信教育部重点实验室北京100876 北京工业大学电子信息与控制工程学院北京100022

The subcarrier allocation problem in cognitive radio（CR）networks with multi-user orthogonal frequency-division multiplexing（ofdm）and distributed antenna is analyzed and modeled for the flat fading channel and the frequency selective channel,where the constraint on the secondary user（SU）to protect the primary user（PU）is that the total throughput of each PU must be above the given threshold instead of the ＂interference temperature＂.According to the features of different types of channels,the optimal subcarrier allocation schemes are proposed to pursue efficiency（or maximal throughput）,using the branch and bound algorithm and the 0-1 implicit enumeration ***,considering the tradeoff between efficiency and fairness,the optimal subcarrier allocation schemes with fairness are proposed in different fading channels,using the pegging *** simulation results illustrate the significant performance improvement of the proposed subcarrier allocation schemes compared with the existing ones in different scenarios.

关键词： cognitive radio subcarrier allocation multi-user ofdm distributed antenna branch and bound algorithm implicit enumeration algorithm pegging algorithm

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