Ultra-Reliable and Low-Latency Communications Using Proactive Multi-Cell Association
Ultra-Reliable and Low-Latency Communications Using Proactive Multi-Cell Association
复制标题
DOI：
10.1109/tcomm.2021.3065979
复制
发表时间：
2021-06-01
影响因子：
8.3
通讯作者：
Gau, Rung-Hung
中科院分区：
文献类型：
--
作者：
Liu, Chun-Hung;Liang, Di-Chun;Gau, Rung-Hung
传统上，实现可靠的通信依赖于闭环方法，但由于复杂的反馈机制和信令风暴，不可避免地会产生大量的网络延迟。因此，这种闭环方法束缚了当前蜂窝网络，在高可靠性和低延迟之间进行权衡。为了完全避免闭环通信带来的延迟，本文研究如何在异构网络（HetNet）中联合使用开环通信和多小区关联，实现超可靠、低延迟的通信。首先介绍了HetNet中的移动的用户如何采用所提出的主动多小区关联（PMCA）方案来形成由多个接入点（AP）组成的虚拟小区，然后分析了通信可靠性和延迟性能。我们表明，通信的可靠性可以显着提高PMCA计划，并通过优化的用户和AP的密度最大化。对上下行链路时延进行了分析，结果表明，采用PMCA方案并合理分配每个AP的无线资源，可以在单个用户的虚拟小区内实现极低的时延。
Attaining reliable communications traditionally relies on a closed-loop methodology but inevitably incurs a good amount of networking latency thanks to complicated feedback mechanism and signaling storm. Such a closed-loop methodology thus shackles the current cellular network with a tradeoff between high reliability and low latency. To completely avoid the latency induced by closed-loop communication, this article aims to study how to jointly employ open-loop communication and multi-cell association in a heterogeneous network (HetNet) so as to achieve ultra-reliable and low-latency communications. We first introduce how mobile users in a HetNet adopt the proposed proactive multi-cell association (PMCA) scheme to form their virtual cell that consists of multiple access points (APs) and then analyze the communication reliability and latency performances. We show that the communication reliability can be significantly improved by the PMCA scheme and maximized by optimizing the densities of the users and the APs. The analyses of the uplink and downlink delays are also accomplished, which show that extremely low latency can be fulfilled in the virtual cell of a single user if the PMCA scheme is adopted and the radio resources of each AP are appropriately allocated.