面向时间敏感网络的5G无线网增强技术研究

doi:10.11959/j.issn.1000-0801.2022085

Abstract

Abstract:

5G deterministic network is a new type of industrial communication technology vigorously promoted by the international industry.3GPP had introduced the time-sensitive communication technology to facilitate deterministic transmission.Compared with ultra-reliable and low-latency communication technology, time-sensitive communication technology further enhanced the 5G network in terms of delay jitter and time synchronization to realize the end-to-end time sensitive communication.Characteristics of time sensitive communication technology were analyzed.Based on the time-sensitive networking and 5G network converged architecture, the time-sensitive communication technology reduces the time synchronization error through the accurate time synchronization mechanism.Additionally, the scheduling enhancement mechanism was introduced to reduce the transmission delay.Furthermore, the Ethernet header compression mechanism was proposed to improve transmission efficiency.

Key words: 5G deterministic network, time-sensitive networking, time-sensitive communication, accurate time syn-chronization, quality of service enhancement

CLC Number:

TN929.5

Jincan XIN, Sen XU, Hua ZHANG, Shangkun XIONG, Hua XU. Study on 5G wireless network enhancement technology for time sensitive networks[J]. Telecommunications Science, 2022, 38(5): 18-25.

Figures/Tables 13

References 19

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用户场景	E2E时延	抖动	可靠性	时间同步需求	传输间隔	服务区域
闭环控制	<10 ms	0.5 ms	99.999 9%	<1 μs	10 ms	100 m×100 m×50 m
运动控制	<0.5 ms	0.5 μs	99.999 9%	<1 μs	0.5 ms	50 m×10 m×10 m
移动机器人	<10 ms	2.5 ms	99.999 9%	<1 μs	10 ms	<1 km²
移动控制面板	≤10 ms	2.5 ms	99.999 9%	<1 μs	/	50 m×10 m×4 m
注：数据来源于3GPP SA1 TS22.104^[1]

机制	IEEE标准	实现功能
时间同步机制	802.1 AS	亚微秒级时间同步
网络流量整形机制	802.1Qav, Qbv, Qch, Qcr	确定性传输时延
资源预留机制	802.1 Qat	时间敏感流量优先调度
配置TSN流量	802.1Q	高效路径冗余、动态流量管理

同步源	同步精度
本地站内GNSS接收机（GPS作为TSN GM时钟）	\|TE\| = 100 ns
本地站内TSN GM时钟	TE可忽略
使用支持PTP的级联传输网络连接的远程TSN GM时钟	\|TE\|~N×40 ns，其中，N等于PTP的跳数

站间距/m	空口精度/ns
10	130～376
20	215～506
60	315
114	355
250	1 080

时间同步误差源	同步误差开销
网络部分：主时钟到基站之间的同步误差	±240～±400 ns
设备部分：设备实现引入的时间同步误差	±50～±100 ns
空口部分：终端与基站间的时间同步误差	±145～±275 ns
空口部分=（总误差-2倍网络部分-2倍设备部分）/2

Study on 5G wireless network enhancement technology for time sensitive networks

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前导码	帧开始符	MAC 目标地址	MAC 源地址	802.1Q标签（可选）	以太类型/长度	负载	冗余校验
7 octet	1 octet	6 octet	6 octet	（4 octet）	2 octet	42～1 500 octet	4 octet

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