5G网络中NSA控制面和用户面时延性能分析

doi:10.11959/j.issn.1000-0801.2020260

Abstract

Abstract:

Different from 2G/3G/4G,the 5G network architecture contains two parts:NSA (non-standalone) and SA (standalone) networking.NSA can help network deploys faster.Low latency is a very important feature of 5G,and its implementation requires a combination of technologies.Based on the 2.6 GHz NR frame structure,combined with theoretical analysis and real case,the current situation and problems of control plane delay and user plane delay were discussed,and the delay optimization method was provided,which provided the corresponding ideas and suggestions for NSA network deployment.

Key words: 5G, frame structure, control plane delay, user plane delay

CLC Number:

TN929.5

Dan ZHANG,Lei WANG,Xiaoqi WANG,Siyu XI. Performance analysis of NSA control plane and user plane delay in 5G network[J]. Telecommunications Science, 2020, 36(9): 141-147.

Figures/Tables 7

References 5

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步骤序号	步骤说明		步骤说明		步骤说明
步骤序号	下行		上行-关预调度		上行-开预调度
1	基站编码、调制（用户数据）	初传	UE编码、调制（SR）	调度	UE编码、调制（用户数据）	初传
2	等待下行传输机会		等待上行传输机会		等待上行传输机会
3	下行传输（用户数据）		上行传输（SR）		上行传输（用户数据）
4	UE解码（用户数据）		基站解调（SR）		基站解调（用户数据）
5	UE编码、调制（NACK）	重传	编码调制（UL Grant）		编码调制（UL Grant）	重传
6	等待上行传输机会		MAC调度		MAC调度
7	上行传输（NACK）		等待下行传输机会		下行传输（UL Grant）
8	基站解密（NACK）		下行传输（UL Grant）		UE解码（UL Grant）
9	MAC调度		UE解码（UL Grant）		UE编码、调制（用户数据）
10	基站编码、调制（用户数据）		UE编码、调制（用户数据）	初传	等待上行传输机会
11	等待下行传输机会		等待上行传输机会		上行传输（用户数据）
12	下行传输（用户数据）		上行传输（用户数据）		基站解密（用户数据）
13	UE解码（用户数据）		基站解密（用户数据）
14			编码调制（UL Grant）	重传
15			MAC调度
16			等待下行传输机会
17			下行传输（UL Grant）
18			UE解码（UL Grant）
19			UE编码、调制（用户数据）
20			等待上行传输机会
21			上行传输（用户数据）
22			基站解密（用户数据）

类别	下行	上行-关预调度	上行-开预调度
gNB高层（symbol）	7	7	7
UE高层（symbol）	7	7	7
物理平均时延（仅初传，symbol）	35.7	228.5	81.9
物理平均时延（含重传，symbol）	136.5	368.5	220.5
平均总时延（symbol）	59.8	256.5	109.8
平均总时延（ms）	2.1	9.2	3.9

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Performance analysis of NSA control plane and user plane delay in 5G network

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