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arXiv 1804.09201cs.NI
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5G无线网络中URLLC业务的资源分配和HARQ优化

Resource Allocation and HARQ Optimization for URLLC Traffic in 5G Wireless Networks

Arjun Anand, Gustavo de Veciana

摘要:

预计5G无线网络将支持超可靠低延迟通信(URLLC)业务,其需要非常低的分组延迟(< 1毫秒)。可靠性极高($\sim$ 99.999\%)。在本文中,我们专注于设计一个无线系统,支持下行链路URLLC业务。使用基于排队网络的无线系统模型,我们表征了各种设计选择对其可以支持的最大URLLC负载的影响,包括:1)系统参数,例如带宽、链路SINR和QoS要求; 2)基于正交频分多址(OFDMA)的系统中的资源分配方案;以及3)混合自动重传请求(HARQ)方案。本文的主要贡献是:1)研究支持给定URLLC负载的最小所需系统带宽如何与相关联的QoS约束缩放; 2)表征最大化可容许URLLC负载的最优OFDMA资源分配方案;以及3)优化基于重复码的HARQ方案,其近似于Chase HARQ组合。

英文摘要:

5G wireless networks are expected to support Ultra Reliable Low Latency Communications (URLLC) traffic which requires very low packet delays ( < 1 msec.) and extremely high reliability ($\sim$99.999\%). In this paper we focus on the design of a wireless system supporting downlink URLLC traffic. Using a queuing network based model for the wireless system we characterize the effect of various design choices on the maximum URLLC load it can support, including: 1) system parameters such as the bandwidth, link SINR , and QoS requirements; 2) resource allocation schemes in Orthogonal Frequency Division Multiple Access (OFDMA) based systems; and 3) Hybrid Automatic Repeat Request (HARQ) schemes. Key contributions of this paper which are of practical interest are: 1) study of how the the minimum required system bandwidth to support a given URLLC load scales with associated QoS constraints; 2) characterization of optimal OFDMA resource allocation schemes which maximize the admissible URLLC load; and 3) optimization of a repetition code based HARQ scheme which approximates Chase HARQ combining.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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