CAJ | 학술논문

该文研究了上行 OFDMA 系统中高能效资源分配问题.首先,在考虑数据包重传条件下将多用户上行OFDMA 系统建模成 M/G/1排队系统,该系统的业务服务速率由其分配得到的资源和当前信道共同决定.在业务平均时延约束下,建立了基于业务统计特性的能效资源分配优化模型.该问题为 NP 难问题,文中提出一种启发式算法,将资源分配分为两步进行:子信道数目确定和子信道分配.仿真表明,所提算法能够在保证业务平均时延的要求下,有效地提升系统能效.
해문연구료상행 OFDMA 계통중고능효자원분배문제.수선,재고필수거포중전조건하장다용호상행OFDMA 계통건모성 M/G/1배대계통,해계통적업무복무속솔유기분배득도적자원화당전신도공동결정.재업무평균시연약속하,건립료기우업무통계특성적능효자원분배우화모형.해문제위 NP 난문제,문중제출일충계발식산법,장자원분배분위량보진행:자신도수목학정화자신도분배.방진표명,소제산법능구재보증업무평균시연적요구하,유효지제승계통능효.
Energy-efficient resource allocation issue in uplink OFDMA systems is investigated. Firstly, the uplink OFDMA system is modeled as a M/G/1 queuing system with the consideration of the packet retransmission and the serve rate of the system is determined by both the resource allocation result and the current channel condition. With the constraint of average delay of traffic, an optimization model for energy-efficient resource allocation is formulated based on the traffic statistical information. Since the optimization problem is NP-hard, a heuristic algorithm is proposed which allocates the resource by two steps: the number of suchannels determines, and allocates the subchannels to each user. Simulation results show that, the proposed algorithm can improve the system energy efficiency effectively while guaranteeing the average delay requirement of the traffic.