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An Opportunistic Cooperative Packet Transmission Scheme in Wireless Multi-Hop Networks

机译：无线多跳网络中的机会合作分组传输方案

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摘要

Cooperative routing, combining cooperative communication in the physical layer and routing technology in the network layer, is one of the most widely used technologies for improving end-to-end transmission reliability and delay in the wireless multi-hop networks. However, the existing cooperative routing schemes are designed based on an optimal fixed-path routing so that the end-to-end performance is greatly restricted by the low spatial efficiency. To address this problem, in this paper an opportunistic cooperative packet transmission (OCPT) scheme is explored by combining cooperative communication and opportunistic routing. The proposed scheme divides the multi-hop route into multiple virtual multiple-input-multiple-output (MIMO) transmissions. Before each transmission, based on the idea of opportunistic routing, a cluster head (CH) is introduced to determine the multiple transmitters and multiple receivers to form a cluster. Then, the single-hop transmission distance is defined as the metric of forward progress to the destination. Each intra-cluster cooperative packet transmission is formulated as a transmit beamforming optimization problem, and an iterative optimal beamforming policy is proposed to solve the problem and maximize the single-hop transmission distance. CH organizes multiple transmitters to cooperatively transmit packets to multiple receivers with the optimized transmit beamforming vector. Finally, according to the transmission results, the cluster is updated and the new cooperative transmission is started. Iteratively, the transmission lasts until the destination has successfully received the packet. We comprehensively evaluate the OCPT scheme by comparing it with conventional routing schemes. The simulation results demonstrate that the proposed OCPT scheme is effective on shortening the end-to-end transmission delay, increasing the number of successful packet transmissions and improving the packet arrival ratio and transmission efficiency.
机译：结合了物理层中的协作通信和网络层中的路由技术的协作路由是提高无线多跳网络中端到端传输可靠性和延迟的最广泛使用的技术之一。但是，现有的协作路由方案是基于最佳固定路径路由设计的，因此端到端性能受到空间效率低的极大限制。为了解决这个问题，本文将机会通信和机会路由相结合，探索了机会协作分组传输（OCPT）方案。所提出的方案将多跳路由划分为多个虚拟多输入多输出（MIMO）传输。在每次传输之前，基于机会路由的思想，引入簇头（CH）以确定多个发送器和多个接收器以形成一个簇。然后，将单跳传输距离定义为前进到目的地的度量。将每个集群内协作包传输公式化为传输波束成形优化问题，并提出了一种迭代最优波束成形策略，以解决该问题并最大化单跳传输距离。 CH组织多个发射器，以优化的发射波束成形向量将数据包协作地发射到多个接收器。最后，根据传输结果，更新集群并开始新的协作传输。反复进行传输，直到目的地成功接收到数据包为止。通过与常规路由方案进行比较，我们对OCPT方案进行了全面评估。仿真结果表明，所提出的OCPT方案有效地缩短了端到端的传输延迟，增加了成功的分组传输次数，提高了分组到达率和传输效率。

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