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Cooperative Access in Wireless Networks: Stable Throughput and Delay

机译：无线网络中的协作访问：稳定的吞吐量和延迟

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摘要

We investigate the impact of a protocol-level cooperation idea in a wireless multiple-access system. By dynamically and opportunistically exploiting spatial diversity among the $N$ source users, a packet is delivered to the common destination through either a direct link or through cooperative relaying by intermediate source nodes that have a statistically better channel to the destination. The traffic burstiness at the source is taken into account, and the performance metrics of the stable throughput region and delay are evaluated for the case of packet-erasure channels. We consider conflict-free, work-conserving transmission policies as well as plain time-division multiple-access policy. We establish that the stable throughput regions under both classes of cooperative policies are the same, which strictly contain the stable throughput regions achieved without cooperation. Moreover, the optimal policy for minimizing the average delay among the class of all cooperative work-conserving policies is determined. Then, in the case of two users, the closed-form delay expressions are explicitly derived as well. Our results indicate that cooperation can significantly reduce delay for both users.
机译：我们研究了无线多址系统中协议级合作理念的影响。通过动态地和机会地利用$ N $源用户之间的空间多样性，可以通过直接链接或通过具有到目的地的统计上更好的通道的中间源节点的协作中继，将数据包传递到公共目的地。考虑了源端的流量突发性，并针对包擦除信道的情况评估了稳定吞吐量区域和延迟的性能指标。我们考虑无冲突，节省工作的传输策略以及普通的时分多址策略。我们确定两类合作策略下的稳定吞吐量区域是相同的，严格地包含了没有合作实现的稳定吞吐量区域。此外，确定了使所有协作工作保存策略类别中的平均延迟最小的最佳策略。然后，在有两个用户的情况下，也明确导出了封闭形式的延迟表达式。我们的结果表明，合作可以大大减少两个用户的延迟。

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