移动终端异系统间切换的改进

doi:10.12305/j.issn.1001-506X.2022.08.33

摘要/Abstract

摘要：

在5G网络建设初期, 相比于4G网络的全面覆盖来说, 5G网络的覆盖并不完善, 所以5G终端会频繁在两种网络之间进行切换, 如果终端只是快速经过5G网络的覆盖范围, 那么终端将会执行两次不必要的切换流程, 造成信令和电量的浪费。在分析了移动终端协议栈非接入层的信令流程之后, 提出了采用延迟切换的方法来控制终端进行网络切换, 在切换到5G网络之前先要等待一段时间。对延迟切换方法进行建模和仿真可以发现, 所提方法在有效减少切换次数的前提下，也能保证用户体验质量。通过分析, 给出了如何设置延迟时间的大小能使延迟切换策略的收益更大。

关键词: 系统间切换, 非接入层, 延迟切换, 信令开销

Abstract:

In the early stage of 5G network construction, compared with the comprehensive coverage of 4G network, the coverage of 5G network is not wide enough. In that case, 5G terminals will frequently switch between the two networks. If the terminals only pass through the area covered with 5G network in a short period of time, the terminals will perform unnecessary switching procedures twice, resulting in waste of signaling and power. After analyzing the signaling flow in the non-access layer of the mobile terminal protocol stack, the method of delayed handover is proposed to reduce the times of unnecessary switches, where the terminals have to wait for a period of time before switching to the 5G network. As can be seen from the modeling and simulation part, the method of delayed handover can guarantee the user experience as well as reducing handover times. Through analysis, this paper also shows the optimal delay time to make the benefits of the delay switching strategy greater.

Key words: intersystem switching, non-access stratum, delayed switching, signaling overhead

中图分类号:

TN929.53

陈发堂, 张杰棠, 何沛, 黄俊霖. 移动终端异系统间切换的改进[J]. 系统工程与电子技术, 2022, 44(8): 2668-2676.

Fatang CHEN, Jietang ZHANG, Pei HE, Junlin HUANG. Improvement of handover between different systems of mobile terminals[J]. Systems Engineering and Electronics, 2022, 44(8): 2668-2676.

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$\mathrm{E}\left[t_{c}\right]=1 / \lambda=50, \eta_{l}=50 \lambda, v_{l}=10 / \eta_{l}^{2}, \eta_{n}=200 \lambda, v_{n}=1000 / \eta_{n}^{2}$
t_d		1/10λ	1/20λ	1/30λ	1/40λ	1/50λ
r(t_d)	分析值	0.002 346 2	0.003 064 9	0.003 483 2	0.003 778 5	0.004 006 7
	仿真值	0.002 265 9	0.002 965 0	0.003 398 6	0.003 861 8	0.003 897 9
	误差	0.035 453 0	0.033 676 9	0.024 913 2	0.022 231 7	0.027 909 8
ρ(t_d)	分析值	0.913 286 7	0.949 793 8	0.963 851 2	0.971 462 1	0.976 284 3
	仿真值	0.911 432 17	0.951 084 4	0.964 770 8	0.970 058 9	0.975 159 3
	误差	0.002 034 87	0.001 357 0	0.000 953 1	0.001 446 5	0.001 153 7

$\mathrm{E}\left[t_{c}\right]=1 / \lambda=50, v_{l}=10 / \eta_{l}^{2}, \eta_{n}=200 \lambda, v_{n}=1000 / \eta_{n}^{2} $
t_d		1/10λ	1/20λ	1/30λ	1/40λ	1/50λ
r(t_d)	η_l=50λ	0.002 346 2	0.003 064 9	0.003 483 2	0.003 778 5	0.004 006 7
r(t_d)	η_l=100λ	0.002 346 2	0.003 064 9	0.003 483 2	0.003 778 5	0.004 006 7
ρ(t_d)	η_l=50λ	0.913 286 7	0.949 793 8	0.963 851 2	0.971 462 1	0.976 284 3
ρ(t_d)	η_l=100λ	0.913 286 7	0.949 793 8	0.963 851 2	0.971 462 1	0.976 284 3

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