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LoLa4SOR: Leveraging Successive Transmissions for Low-Latency Buffer-Aided Opportunistic Relay Networks
IEEE Open Journal of the Communications Society Pub Date : 2021-05-03 , DOI: 10.1109/ojcoms.2021.3077036
Nikolaos Nomikos , Themistoklis Charalambous , Nikolaos Pappas , Demosthenes Vouyioukas , Risto Wichman

Buffer-aided (BA) relaying improves the diversity of cooperative networks often at the cost of increasing end-to-end packet delays. This characteristic renders BA relaying unsuitable for delay-sensitive applications. However, the increased diversity makes BA relaying appealing for ultra-reliable communications. Towards enabling ultra-reliable low-latency communication (URLLC), we aim at enhancing BA relaying for supporting delay-sensitive applications. In this paper, reliable full-duplex (FD) network operation is targeted and for this purpose, hybrid relay selection algorithms are formulated, combining BA successive relaying (SuR) and delay- and diversity-aware (DDA) half-duplex (HD) algorithms. In this context, a hybrid FD DDA algorithm is presented, namely LoLa4SOR, switching between SuR and HD operation. Additionally, a low-complexity distributed version is given, namely d-LoLa4SOR, providing a trade-off among channel state information requirements and performance. The theoretical analysis shows that the diversity of LoLa4SOR equals to two times the number of available relays $K$ , i.e., $2K$ , when the buffer size $L$ is greater than or equal to 3. Comparisons with other HD, SuR and hybrid algorithms reveal that LoLa4SOR offers superior outage and throughput performance while, the average delay is reduced due to SuR-based FD operation and the consideration of buffer state information for relay-pair selection. d-LoLa4SOR, as one of the few distributed algorithms in the literature, has a reasonable performance that makes it a more practical approach.

中文翻译:

LoLa4SOR:利用低延迟缓冲辅助机会中继网络的连续传输

缓冲区辅助(BA)中继通常以增加端到端数据包延迟为代价来改善协作网络的多样性。此特性使BA中继不适用于对延迟敏感的应用。但是,增加的多样性使BA中继吸引了超可靠的通信。为了实现超可靠的低延迟通信(URLLC),我们旨在增强BA中继以支持对延迟敏感的应用程序。本文以可靠的全双工(FD)网络操作为目标,为此目的,结合BA连续中继(SuR)和延迟感知和分集(DDA)半双工(HD)制定了混合中继选择算法。算法。在这种情况下,提出了混合FD DDA算法,即LoLa4SOR,可在SuR和HD操作之间进行切换。此外,给出了一个低复杂度的分布式版本,即d-LoLa4SOR,它在信道状态信息要求和性能之间进行了折衷。理论分析表明,LoLa4SOR的多样性等于可用继电器数量的两倍 $ K $ , IE, $ 2K $ ,当缓冲区大小 $ L $ 大于或等于3。与其他HD,SuR和混合算法的比较显示,LoLa4SOR提供了卓越的中断和吞吐量性能,同时由于基于SuR的FD操作以及中继器的缓存状态信息的考虑,平均延迟得以减少。配对选择。d-LoLa4SOR作为文献中为数不多的分布式算法之一,其合理的性能使其成为一种更实用的方法。
更新日期:2021-05-11
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