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首页> 外文期刊>Wireless Communications, IEEE Transactions on >J-CAR: An efficient joint channel assignment and routing protocol for IEEE 802.11-based multi-channel multi-interface mobile Ad Hoc networks
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J-CAR: An efficient joint channel assignment and routing protocol for IEEE 802.11-based multi-channel multi-interface mobile Ad Hoc networks

机译：J-CAR：一种有效的联合信道分配和路由协议，用于基于IEEE 802.11的多信道多接口移动Ad Hoc网络

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摘要

The capacity of an IEEE 802.11-based multi-hop wireless network is limited. By effectively utilizing multiple non-overlapping channels and multiple interfaces, collision and co-channel interference can be reduced. This allows more concurrent transmissions and thus enhances the network capacity. In this paper, we introduce an efficient distributed joint channel assignment and routing protocol, called J-CAR. Unlike existing schemes, J-CAR allows a data interface to dynamically change its routing protocol working mode between send and receive on a call-by-call basis, which distributed joint channel assignment enhances the utilization of both interface and channel. In J-CAR, channels are negotiated and assigned to active links in conjunction with the on-demand routing process. At each hop, J-CAR conducts a local optimization by selecting the least interfered channel according to the channel interference index. The channel interference index is designed by taking both the protocol and physical interference models into consideration. To find the least interfered path for network load balancing on a global scale, J-CAR employs a length-constrained widest-path routing. The ldquowidthrdquo of a path is determined by the interference level of its bottleneck link. With an adjustable threshold on the path length (with respect to the shortest-path), the excessively long path can also be avoided. We show that with a comparable complexity as the existing schemes, J-CAR provides much higher system good puts and shorter end-to-end packet delays.
机译：基于IEEE 802.11的多跳无线网络的容量受到限制。通过有效地利用多个非重叠信道和多个接口，可以减少冲突和同信道干扰。这允许更多的并发传输，从而增强了网络容量。在本文中，我们介绍了一种有效的分布式联合通道分配和路由协议，称为J-CAR。与现有方案不同，J-CAR允许数据接口在逐个呼叫的基础上在发送和接收之间动态更改其路由协议的工作模式，而分布式联合通道分配可提高接口和通道的利用率。在J-CAR中，通过按需路由过程来协商通道并将其分配给活动链路。在每一跳处，J-CAR通过根据信道干扰指数选择受干扰最小的信道来进行局部优化。通过同时考虑协议和物理干扰模型来设计信道干扰指数。为了在全球范围内找到用于网络负载平衡的受干扰最少的路径，J-CAR采用了长度受约束的最宽路径路由。路径的“宽度”由其瓶颈链路的干扰级别决定。通过对路径长度（相对于最短路径）的可调阈值，也可以避免路径过长。我们显示，J-CAR具有与现有方案相当的复杂性，可提供更高的系统性能，并具有更短的端到端数据包延迟。

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