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A delay-constrained protocol with adaptive mode selection for bidirectional relay networks

机译：双向中继网络中具有自适应模式选择的时延受限协议

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摘要

In this paper, we consider a bidirectional relay network with half-duplex nodes and block fading where the nodes transmit with a fixed transmission rate. Thereby, user 1 and user 2 exchange information only via a relay node, i.e., a direct link between both users is not present. Recently in [1], it was shown that a considerable gain in terms of sum throughput can be obtained in bidirectional relaying by optimally selecting the transmission modes or, equivalently, the states of the nodes, i.e., the transmit, the receive, and the silent states, in each time slot based on the qualities of the involved links. To enable adaptive transmission mode selection, the relay has to be equipped with two buffers for storage of the data received from the two users. However, the protocol proposed in [1] was delay-unconstrained and provides an upper bound for the performance of practical delay-constrained protocols. In this paper, we propose a heuristic but efficient delay-constrained protocol which can approach the performance upper bound reported in [1]. Moreover, the average throughput and delay of the protocol are evaluated by analyzing the Markov chain of the states of the queues.
机译：在本文中，我们考虑具有半双工节点的双向继电器网络和块衰落，其中节点以固定传输速率发送。因此，用户1和用户2仅经由中继节点交换信息，即，不存在两个用户之间的直接链路。最近在[1]中，示出了通过最佳地选择传输模式或等效地，即，发送，接收和该节点的状态，可以在双向中继方面获得相当大的增益。静默状态，在每个时隙的基础上，基于所涉及的链路的品质。为了启用自适应传输模式选择，中继必须配备两个缓冲器，用于存储从两个用户接收的数据。然而，[1]中提出的协议是延迟无关紧要的，并为实际延迟约束方案提供了一个上限。在本文中，我们提出了一种启发式但有效的延迟约束协议，可以接近[1]中报告的性能上限。此外，通过分析队列状态的马尔可夫链来评估协议的平均吞吐量和延迟。

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