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IEEE802.16网络动态自适应区分服务算法

DOI: 10.3969/j.issn.1006-7043.201309060

Keywords: 无线网络, IEEE802.16, 带宽调度, 自适应, 区分服务

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Abstract:

针对IEEE802.16MAC协议中的调度机制不能提供流媒体业务区分服务的问题, 提出了一种基于服务类别优先级的链路带宽自适应分配调度PDA-DFPQ算法。该算法分为两级调度架构, 第一级是不同业务间的调度, 采用服务质量优先级策略, 高优先级服务类分配合适的带宽, 以保障实时业务对最大时延限定的要求;第二级是同种业务内的调度, 采用自适应调整机制, 根据队列长度和分组数动态设置权值系数, 以保障不同用户对公平性和非实时业务对吞吐量的要求。仿真结果表明:与DRR和RED-DFPQ算法相比较, 改进的一级调度算法能降低时延, 解决实时性问题;改进的二级调度算法能均衡用户速率, 提高网络吞吐量和公平性, 解决突发性问题。

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