面向6G网络的信息时效性度量及研究进展

doi:10.11959/j.issn.1000-0801.2021127

电信科学 ›› 2021, Vol. 37 ›› Issue (6): 3-13.doi: 10.11959/j.issn.1000-0801.2021127

所属专题： 6G

面向6G网络的信息时效性度量及研究进展

孙径舟, 王乐涵, 孙宇璇, 周盛, 牛志升

清华大学电子工程系，北京 100084

修回日期:2021-06-10 出版日期:2021-06-20 发布日期:2021-06-01
作者简介:孙径舟（1996- ），男，清华大学博士生，主要研究方向为无线网络中的智能资源分配、低时延无线通信和海量接入技术
王乐涵（1996- ），女，清华大学博士生，主要研究方向为低时延无线通信、车联网等
孙宇璇（1993- ），女，博士，清华大学电子工程系在站博士后，主要研究方向为边缘智能、移动边缘计算、车联网等
周盛（1983- ），男，博士，清华大学电子工程系副教授，主要研究方向为多天线系统的跨层设计、移动边缘计算、车联网和绿色无线通信
牛志升（1964- ），男，博士，清华大学电子工程系教授，主要研究方向为排队论、流量工程、移动互联网、无线网络资源管理、绿色通信与网络
基金资助:
国家重点研发计划项目(2020YFB1806605);国家自然科学基金资助项目(62022049)

Information timeliness metrics and research progress for 6G network

Jingzhou SUN, Lehan WANG, Yuxuan SUN, Sheng ZHOU, Zhisheng NIU

Department of Electronic Engineering, Tsinghua University, Beijing 100084, China

Revised:2021-06-10 Online:2021-06-20 Published:2021-06-01
Supported by:
The National Key Research and Development Program of China(2020YFB1806605);The National Natural Science Foundation of China(62022049)

摘要/Abstract

摘要：

在未来的6G网络中，机器型通信将成为网络承载的主要业务，并催生大量垂直行业应用，如网联自动驾驶、工业物联网等，从而使这些应用成为新的经济增长点。此类应用往往涉及状态信息的收集、处理与分发，对网络的时延具有极高的要求。而现有的低时延指标在节点数多、通信资源有限的场景下难以满足此要求。针对这一问题，指出在状态更新系统中应考虑信息时效性而非仅考虑时延。在此基础上，按照利用状态信息内容程度的不同，梳理了相关代表性工作，分别介绍并比较了多种信息时效性度量。最后，讨论了信息时效性的未来研究方向与亟须解决的关键问题。

关键词: 状态更新系统, 信息时效性, 低时延, 通信网络

Abstract:

In the future 6G network, machine-type communication will dominate the network traffic.Many vertical applications, such as networked autonomous driving and industrial internet of things, will become new growth points.Such applications usually consist of the collection of status information and distribution of control signals, requiring ultra-low latency.However, this requirement is hard to meet with a large number of end nodes and limited communication resources.In view of this confliction, it was pointed out that the freshness of information should be considered in the status update system instead of just latency.Furthermore, according to the degree of utilization of status information, various measures of information freshness were introduced, and related representative work was summarized.Finally, the future research directions of information freshness and key questions that need to be answered were discussed.

Key words: status update system, information freshness, low latency, communication network

中图分类号:

TN915

孙径舟, 王乐涵, 孙宇璇, 周盛, 牛志升. 面向6G网络的信息时效性度量及研究进展[J]. 电信科学, 2021, 37(6): 3-13.

Jingzhou SUN, Lehan WANG, Yuxuan SUN, Sheng ZHOU, Zhisheng NIU. Information timeliness metrics and research progress for 6G network[J]. Telecommunications Science, 2021, 37(6): 3-13.

图/表 6

图1

表1

信息时效性度量对比"

度量名称	定义	考虑因素	适用场景
信息年龄	$t - \max (S_{i} \| D_{i} < t)$	信息产生之后所经过时间	获取发送端状态存在代价或不便于定义状态偏差
同步信息年龄	$t - U_{S} (t)$	状态信息异步时间	部分利用状态信息内容，如缓存等场景
错误信息年龄	$f (t) \times g (X (t), \hat{X (t)})$	状态信息内容偏差；状态信息异步时间	状态偏差可定义
信息紧迫度	$ω (t) δ (Q (t))$	状态信息内容偏差；状态信息异步时间；情境信息	状态偏差可定义，且不同情境下对信息时效性有差异化需求

表1

图2

表2

图3

图4

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参考文献	MAC协议	采样过程	信道假设
参考文献[12]	ALOHA	调度采样	非理想信道
参考文献[13]	CSMA	调度采样/随机采样	/
参考文献[14]	轮询	随机采样	理想信道
参考文献[15]	CSMA	随机采样	理想信道
参考文献[16]	ALOHA/CSMA	调度采样	非理想信道

面向6G网络的信息时效性度量及研究进展

Information timeliness metrics and research progress for 6G network

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