一种优化时延的机会协同组播调度策略

J4 ›› 2012, Vol. 34 ›› Issue (4): 12-16.

一种优化时延的机会协同组播调度策略

陈彦德1,宋留斌1,2,黎刚1,张练1,谭理1

（1.南京军区通信网络技术管理中心，江苏南京 210016;
2.解放军理工大学通信工程学院，江苏南京 210007）

收稿日期:2011-11-05 修回日期:2012-02-10 出版日期:2012-04-26 发布日期:2012-04-25

An Opportunistic Cooperative Multicast Scheduling Strategy for Optimizing Broadcasting Latency

CHEN Yande1,SONG Liubin1,2,LI Gang1,ZHANG Lian1,TAN Li1

（1.Communication Network Technology Management Center of Nanjing Military Zone,Nanjing 210016;
2.School of Communication Engineering,
PLA University of Science and Technology,Nanjing 210007,China）

Received:2011-11-05 Revised:2012-02-10 Online:2012-04-26 Published:2012-04-25

摘要/Abstract

摘要：

无线组播面临的最大问题是各个用户信道状态的不均匀性和波动性，无法同时满足所有用户的服务质量需求。无线蜂窝通信系统中，为实现可靠组播，数据包不可避免地需要被重传多次，组播的时延也因此增加。本文我们首先分析了协同组播调度CMS策略的时延，并且推导了基于信道信息全知条件下的最小时延。另外，我们在部分信道信息未知条件下提出了一种机会协同组播策略来优化组播时延。仿真数据显示，我们提出的机会协同组播调度OCMS策略在时延性能上几乎达到了我们所分析的CMS策略的最小值而且明显优于其他调度策略。

关键词: 组播时延；机会协同组播调度；可靠组播

Abstract:

The most serious problem of the wireless multicast system is the all users’ QoS (Quality of Service) demands can not be satisfied simultaneously for the variety and unequality of users’ channels. In wireless cellular communication systems, packets should inevitably be transmitted multiple times to achieve reliable multicast，which increases the multicast latency. In this paper, we first analyze the latency of cooperative multicast scheduling (CMS) and derive the minimal latency at the assumption that we know the total channel state information. In addition, an opportunistic cooperative multicast scheduling (OCMS) strategy is proposed to optimize the multicast latency on the condition that only part of the channel state information is achieved by some feedback signals. The simulation results show that the proposed strategy almost reaches the optimal latency of CMS and outperforms other schemes markedly on the performance of transmission latency.

Key words: multicast latency;opportunistic cooperative multicast scheduling;reliable multicast

陈彦德1,宋留斌1,2,黎刚1,张练1,谭理1. 一种优化时延的机会协同组播调度策略[J]. J4, 2012, 34(4): 12-16.

CHEN Yande1,SONG Liubin1,2,LI Gang1,ZHANG Lian1,TAN Li1. An Opportunistic Cooperative Multicast Scheduling Strategy for Optimizing Broadcasting Latency[J]. J4, 2012, 34(4): 12-16.