基于时延QoS保证的双向中继跨层资源分配.docVIP

n 基于时延 QoS 保证的双向中继跨层资源分配 林涔，刘元，陶梅霞 上海交通大学电子信息与电气工程学院，上海，200240 摘要：本文考虑了基于时延 QoS 保证的双向中继系统的跨层设计问题，旨在于找出最优的跨 层资源分配策略，以最大化时延受限的双向中继通信用户的加权速率和。通过运用有效容量理 论，时延需求以 QoS 指数来建模，而 QoS 指数也是唯一的层与层之间需要交换的信息。从而 这一跨层优化问题可等效于有效容量加权和最大化问题。本文提出了最优的双向中继联合功率 和速率自适应分配策略。数值仿真表明，所提出的策略可以有效地支持不同的 QoS 需求，并 且显著提高双向中继系统的通信性能。 关键词：无线通信，跨层优化，双向中继，服务质量 (QoS)，有效容量，资源分配 Cross-Layer Resource Allocation of Two-Way Relaying for Statistical Delay-QoS Guarantees LIN Cen, LIU Yuan, TAO Meixia Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, 200240 Abstract: This paper considers the cross-layer design for delay quality-of-service (QoS) provisioning in two-way relay systems. The aim is to ?nd the optimal cross-layer resource allocation policy to maximize the weighted sum-rate of the considered two-way relay system while guaranteeing the bounded delay-QoS constraints for both users. By applying the concept of e?ective capacity, the delay requirements are characterized as the statistical QoS exponents, which are the only information exchanged between layers. The cross-layer optimization problem then is equivalent to a weighted sum e?ective capacity maximization problem. The optimal joint power and rate adaptation policy for the two-phase two-way relaying is derived. Numerical results show that the proposed policy can e?ciently support diverse QoS requirements and signi?cantly improve the performance compared with either the ?xed power scheme or the conventional weight-based method. Key words: Wireless communication, cross-layer optimization, two-way relaying, quality-of-service (QoS), e?ective capacity, resource allocation. 基金项目： The Doctoral Fund of Ministry of Education of China (200802481002)，the National Natural Science Foun- dation of China 作者简介： Lin Cen（1988-），male，major research direction：resource allocation in two-way relaying, cognitive ra- dio and femtocell for QoS provisioning. Liu Yuan (1984-), male, major research direction: resource allocation, cooperat