5G网络时敏业务的时延特性分析  

Delay characteristics of time-sensitive services in 5G networks

作　　者：曹建宇 冯伟[2] 葛宁[2] CAO Jianyu;FENG Wei;GE Ning(School of Computer Science and Information Security,Guilin University of Electronic Technology,Guilin 541004,China;Department of Electronic Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]桂林电子科技大学计算机与信息安全学院,广西桂林541004 [2]清华大学电子工程系,北京100084

出　　处：《物联网学报》2022年第4期93-103,共11页Chinese Journal on Internet of Things

基　　金：国家重点研发计划(No.2020YFA0711301);国家自然科学基金资助项目(No.61922049,No.61941104)。

摘　　要：面向工业应用,5G接入网需要同时支持时敏与非时敏业务。两类业务共享无线资源和缓冲队列,常导致时延的复杂耦合与不确定。针对ON-OFF时敏业务与非时敏业务共存场景,基于二阶级联排队模型,建立包含排队时延的随机时延特性计算方法,得到时敏业务的时延均值、标准差、越界概率与概率分布。在此基础上,分析非时敏业务对时敏业务随机时延特性的影响。实验表明,非时敏业务对ON-OFF时敏业务随机时延特性的影响与ON-OFF阶段的轮换频率相关;ON-OFF时敏业务时延的概率分布与伽马分布的右拖尾长度近似相等。For industrial applications,the time-sensitive services(TSS)and non TSS need to share the radio resources and the same buffer queue in 5G radio access network(RAN).This incurs the complex coupling and uncertainty of the delays.Considering the scenario where ON-OFF TSS and non TSS coexist,the calculation methods for the random delay(including queueing delay)characteristics were established based on the two-stage tandem queueing model,to obtain the mean value,standard deviation,bound violation probability and probability distribution of the delay of TSS.On this basis,the influence of non TSS on the random delay characteristics of TSS was analyzed.It is shown that the influence of non TSS on the random delay characteristics of ON-OFF TSS is related to the rotation frequency of ON-OFF stages.Moreover,the delay probability distribution of ON-OFF TSS has approximately the same right tail length as Gamma distribution.

关 键 词：5G 时敏业务 随机时延特性 级联排队模型 

分 类 号：TN91[电子电信—通信与信息系统]