An efficient joint channel assignment and QoS routing protocol for IEEE 802.11 multi-radio multi-channel wireless mesh networks
An efficient joint channel assignment and QoS routing protocol for IEEE 802.11 multi-radio multi-channel wireless mesh networks
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DOI：
10.1016/j.jnca.2012.11.003
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
Yuhuai Peng;Yao Yu;Lei Guo;Dingde Jiang;Qiming Gai
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文献类型：
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作者：
Yuhuai Peng;Yao Yu;Lei Guo;Dingde Jiang;Qiming Gai
随着视频、IP语音（VoIP）等实时多媒体业务的出现，带宽、时延和抖动等方面的服务质量（QoS）问题越来越受到人们的关注。作为宽带无线接入的有效方式之一，无线网状网（WMN）提供QoS保证已成为当务之急。现有的工作大多是修改专用于ad hoc或传感器网络的QoS体系结构，并集中在单无线电和单信道的情况下。同时，从隔离层的角度研究了QoS路由或MAC协议。在本文中，我们提出了一种新的跨层QoS感知路由协议OLSR（CLQ-OLSR），以支持实时多媒体通信，有效地利用多无线电和多信道的方法。通过在物理拓扑上构造多层虚拟逻辑映射，实现了两套路由机制：物理改进OLSR协议（M-OLSR）和逻辑路由，以适应网络流量。建议CLQ-OLSR是基于一个分布式的带宽估计方案，在每个节点估计每个相关的信道上的可用带宽。通过捎带HELLO和拓扑控制（TC）消息中的带宽信息，每个节点以有效的方式向整个网络中的其他节点分发拓扑和可用带宽信息。根据拓扑和带宽信息，可以识别优化路径。最后，在QualNet平台上对CLQ-OLSR在不同场景下的性能进行了仿真验证。结果表明，我们提出的CLQ-OLSR在网络总吞吐量、端到端数据包传输率、延迟和延迟抖动方面优于单无线电OLSR、多无线电OLSR和具有区分服务（DiffServ）的OLSR，并且具有合理的消息开销和硬件成本。特别是，CLQ-OLSR的网络总吞吐量几乎可以提高300%相比，单无线电的情况。
With the emerging of video, voice over IP (VoIP) and other real-time multimedia services, more and more people pay attention to quality of service (QoS) issues in terms of the bandwidth, delay and jitter, etc. As one effective way of broadband wireless access, it has become imperative for wireless mesh networks (WMNs) to provide QoS guarantee. Existing works mostly modify QoS architecture dedicated for ad hoc or sensor networks, and focus on single radio and single channel case. Meanwhile, they study the QoS routing or MAC protocol from view of isolated layer. In this paper, we propose a novel cross-layer QoS-aware routing protocol on OLSR (CLQ-OLSR) to support real-time multimedia communication by efficiently exploiting multi-radio and multi-channel method. By constructing multi-layer virtual logical mapping over physical topology, we implement two sets of routing mechanisms, physical modified OLSR protocol (M-OLSR) and logical routing, to accommodate network traffic. The proposed CLQ-OLSR is based on a distributed bandwidth estimation scheme, implemented at each node for estimating the available bandwidth on each associated channel. By piggybacking the bandwidth information in HELLO and topology control (TC) messages, each node disseminates information of topology and available bandwidth to other nodes in the whole network in an efficient way. From topology and bandwidth information, the optimized path can be identified. Finally, we conduct extensive simulation to verify the performance of CLQ-OLSR in different scenarios on QualNet platform. The results demonstrate that our proposed CLQ-OLSR outperforms single radio OLSR, multi-radio OLSR and OLSR with differentiated services (DiffServ) in terms of network aggregate throughput, end-to-end packet delivery ratio, delay and delay jitter with reasonable message overheads and hardware costs. In particular, the network aggregate throughput for CLQ-OLSR can almost be improved by 300% compared with the single radio case.