中继系统基于QoS保障的跨层优化设计

doi:10.3969/j.issn.1001-2400.2013.02.013

J4 ›› 2013, Vol. 40 ›› Issue (2): 72-81.doi: 10.3969/j.issn.1001-2400.2013.02.013

中继系统基于QoS保障的跨层优化设计

唐伦;张荣荣;陈前斌

(重庆邮电大学移动通信技术重点实验室，重庆 400065)

收稿日期:2012-05-02 出版日期:2013-04-20 发布日期:2013-05-22
作者简介:唐伦(1973-)，男，副教授，博士，E-mail: tangl@cqupt.edu.cn．
基金资助:
国家自然科学基金资助项目(60972070);重庆市自然科学基金资助项目(CSTC2009BA2090);重庆市教委基金资助项目(KJ100514);重庆邮电大学博士启动基金资助项目(A2011-2);重庆市科委重点实验室专项经费资助项目

Cross-layer optimization and design based on QoS guarantees in the relay system

TANG Lun;ZHANG Rongrong;CHEN Qianbin

(Key Lab. of Mobile Communication Technology, Chongqing Univ. of Posts and Telecommunications, Chong 400065， China)

Received:2012-05-02 Online:2013-04-20 Published:2013-05-22

摘要/Abstract

摘要：

针对中继系统如何满足QoS要求并提高系统吞吐量的问题，提出了在Nakagami-m衰落信道下，联合物理层自适应调制编码(AMC)和链路层协作混合自动请求重传(CHARQ)技术的跨层优化设计方案．该方案利用状态转移图研究了中继系统丢包率性能，采用排队论模型分析了数据包排队时延性能．在满足丢包率、排队时延和传输时延等约束条件下，建立了最大化系统吞吐量的跨层优化模型．仿真结果表明，联合CHARQ与AMC的跨层设计方案，可以在满足QoS要求的情况下，实现最优的吞吐量、最小的丢包率及最短的排队时延和传输时延．

关键词: 混合自动请求重传, 自适应调制编码, 状态转移图, Markov模型, Nakagami-m信道

Abstract:

In order to improve the throughput and guarantee the quality-of-service (QoS) for a relay system, a cross-layer design scheme which combines adaptive modulation and coding (AMC) at the physical layer with cooperative hybrid automatic repeat request (CHARQ) at the link layer is proposed over the Nakagami-m fading channel. Firstly, the system packet loss rate (PLR) is described and analyzed through the state transition diagram. Then, the queuing delay is derived using the queuing theory. Moreover, a cross-layer model for maximizing system throughput is presented under the constraints of PLR, queuing delay and transmission delay. Numerical results show that the cross-layer design scheme combining CHARQ with AMC can achieve the optimal throughput, the smallest PLR and the shortest queuing delay and transmission delay.

Key words: hybrid automatic repeat request (HARQ), adaptive modulation and coding (AMC), state transition diagram, Markov model, Nakagami-m channel

唐伦;张荣荣;陈前斌. 中继系统基于QoS保障的跨层优化设计[J]. J4, 2013, 40(2): 72-81.

TANG Lun;ZHANG Rongrong;CHEN Qianbin. Cross-layer optimization and design based on QoS guarantees in the relay system[J]. J4, 2013, 40(2): 72-81.

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[1]	唐伦陈前斌张荣荣. 中继系统基于QoS保障的跨层优化设计[J]. J4, 2013, 40(2): 72-81.
[2]	于卫;郭建强;蔡希尧. 面向对象软件的测试[J]. J4, 1998, 25(6): 0-0.

中继系统基于QoS保障的跨层优化设计

Cross-layer optimization and design based on QoS guarantees in the relay system

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