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arXiv 1902.07933cs.NIcs.ITmath.IT
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可靠性-延迟约束下的免授权接入吞吐量最大化

On Throughput Maximization of Grant-Free Access with Reliability-Latency Constraints

H. Murat Gürsu, Wolfgang Kellerer, Cedomir Stefanović

摘要:

通过无线网络实现自动驾驶和工业自动化带来了许多挑战,这些挑战通常通过可靠性和延迟要求来抽象。蜂窝网络中延迟的主要贡献者之一是基于预留的接入,其涉及冗长且资源低效的信令交换。另一种方法是使用免授权访问,其中没有资源预留。最近的一些工作研究了如何使用不同风格的免授权解决方案来满足可靠性和延迟要求。然而,资源效率,即,吞吐量只是次要的焦点。在这项工作中,我们制定的吞吐量的免授权访问下的可靠性延迟的限制,当到达用户的实际数量或只有到达分布是已知的。我们调查这些不同层次的知识的到达过程的影响吞吐量性能的帧时隙ALOHA与$K$ -多包接收,泊松和β到达。我们表明,根据可靠性延迟要求的吞吐量可以显着提高接入网络的预期负载较高,如果到达用户的实际数量是已知的。这一认识促使人们使用技术来估计到达的用户人数,因为这种知识在免赠款访问中并不容易获得。我们还评估了估计误差的影响,表明对于高可靠性延迟的要求,吞吐量的增益仍然相当可观。

英文摘要:

Enabling autonomous driving and industrial automation with wireless networks poses many challenges, which are typically abstracted through reliability and latency requirements. One of the main contributors to latency in cellular networks is the reservation-based access, which involves lengthy and resource-inefficient signaling exchanges. An alternative is to use grant-free access, in which there is no resource reservation. A handful of recent works investigated how to fulfill reliability and latency requirements with different flavors of grant-free solutions. However, the resource efficiency, i.e., the throughput, has been only the secondary focus. In this work, we formulate the throughput of grant-free access under reliability-latency constraints, when the actual number of arrived users or only the arrival distribution are known. We investigate how these different levels of knowledge about the arrival process influence throughput performance of framed slotted ALOHA with $K$-multipacket reception, for the Poisson and Beta arrivals. We show that the throughput under reliability-latency requirements can be significantly improved for the higher expected load of the access network, if the actual number of arrived users is known. This insight motivates the use of techniques for the estimation of the number of arrived users, as this knowledge is not readily available in grant-free access. We also asses the impact of estimation error, showing that for high reliability-latency requirements the gains in throughput are still considerable.

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