认知协作Ad Hoc网络中分布路由跨层控制策略

Cross-Layer Control Strategy of Distributed Routing in Cognitive and Cooperative Ad Hoc Networks

摘要:

认知无线电Ad Hoc网络中,吞吐量最大化是一个关键的挑战。为了实现这一目标,协同传输是前景看好的技术,利用在每个空间节点的多样性中继链路以增加性能,特别是在无线环境中由于不同的信道质量、有限的能源和带宽资源,这种想法是有吸引力的。文章在分布式动态环境下,研究了联合动态路由,中继分配和频谱分配分布式和本地算法,提出了一个跨层协议实现联合路由,中继选择和动态频谱分配并通过仿真对其性能进行评估。绩效评价结果表明,该协议比不依赖于协作解决方案实现更高的吞吐量。

Abstract:

Throughput maximization is a key challenge in cognitive radio ad hoc networks. To achieve this objective, cooperative transmission is a promising technique to increase the capacity of relay links by exploiting spatial diversity without multiple antennas at each node. This idea is particularly attractive in wireless environments due to the diverse channel quality and the limited energy and bandwidth resources. In this paper, decentralized and localized algorithms for joint dynamic routing, relay assignment, and spectrum allocation in a distributed and dynamic environment were proposed and studied. A cross-layer protocol to implement the joint routing, relay selection, and dynamic spectrum allocation algorithm was also introduced, and its performance was evaluated through simulation. Performance evaluation results showed the proposed protocol achieved much higher throughput than solutions that did not rely on cooperation.