【5G系列】如何学习测试协议（2）——NAS选网测试协议6.1.1.1

以38523 -1 -g30协议为参考，先看一下NG-RAN单模的PLMN选择用例，章节号：6.1.1.1

测试目的

在RPLMN\HPLMN\UPLMN\OPLMN都有效，而且RPLMN有限场景中，终端回到覆盖区，应该优先选择RPLMN，并发起注册。

with { UE in Automatic network selection mode and RPLMN, HPLMN, UPLMN and OPLMN NR cells available

and UE is fitted with a USIM indicating RPLMN should be selected }

ensure that {

when { UE is switched on or return to coverage }

then { UE selects a cell of the RPLMN and UE attempts Registration on the selected cell }

}

当驻留在VPLMN时，高优先级的PLMN可用时，应该周期性去搜索高优先级小区。

with { UE camped on an NG-RAN VPLMN cell and cells of a higher priority NG-RAN PLMN available }

ensure that {

when { higher priority PLMN search timer T expires }

then { UE selects and camps on a cell of the highest priority PLMN and UE attempts Registration with mobility on the selected cell }

}

自动选网时，按照优先级顺序依次选网

with { UE in Automatic network selection mode and HPLMN, UPLMN and OPLMN NG-RAN cells available and

UE is fitted with a USIM with Access Technology data files for each PLMN and there are no equivalent HPLMNs defined}

ensure that {

when { UE is switched on or return to coverage }

then { UE selects a cell of the highest priority PLMN and UE attempts Registration with mobility on the selected cell }

}

在VPLMN时，如果HPLMN可用，需要T周期内驻留到HPLMN

with { UE camped on an NR VPLMN cell and cells of a NG-RAN HPLMN available }

ensure that {

when { higher priority PLMN search timer T expires }

then { UE selects and camps on a cell of HPLMN and UE attempts Registration on the selected cell }

协议依据

比如，

下面这个就是告诉我们选网的优先级顺序。

[TS 23.122, clause 4.4.3.1.1]

The MS selects and attempts registration on other PLMN/access technology combinations, if available and allowable, in

the following order:

i) either the HPLMN (if the EHPLMN list is not present or is empty) or the highest priority EHPLMN that is

available (if the EHPLMN list is present) ;

ii) each PLMN/access technology combination in the "User Controlled PLMN Selector with Access Technology" data file in the SIM (in priority order);

iii) each PLMN/access technology combination in the "Operator Controlled PLMN Selector with Access Technology"data file in the SIM (in priority order);

iv) other PLMN/access technology combinations with received high quality signal in random order;

v) other PLMN/access technology combinations in order of decreasing signal quality

测试条件

System Simulator:指定当前系统配置

四个异频小区，各小区的PLMN配置参考如下表，所有小区都是高质量小区，是suitable小区；

测试步骤

小区信号调整步骤

测试步骤，P代表期望的行为，F表示不期望的行为，数字代表前文测试目的的编号

来源：oschina

链接：https://my.oschina.net/u/4291687/blog/4560839

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