【5G学习笔记-1】 NSA upperLayerIndication

 upperLayerIndication出现在PLMN-InfoList-r15中。

在36.331 6.3.1节 中定义 (SystemInformationBlockType2 information element)

Presence of PLMN-InfoList-r15 signals that PLMNs supporting 5G-NR services are available.

PLMN-InfoList-r15 ::=	SEQUENCE (SIZE (1..maxPLMN-r11)) OF PLMN-Info-r15

PLMN-Info-r15 ::=  SEQUENCE {
  upperLayerIndication-r15	      ENUMERATED {true}		OPTIONAL	-- Need OR
}

紧接着表格SystemInformationBlockType2 field descriptions中定义如下:

plmn-InfoList

If E-UTRAN includes this field, it includes the same number of entries, and listed in the same order as PLMNs across the plmn-IdentityList fields included in SIB1. I.e. the first entry corresponds to the first entry of the combined list that results from concatenating the entries included in the second to the original plmn-IdentityList field.

 

即 SIB中plmn-InfoList包含的upperLayerIndication的个数和SIB1中plmn-IdentityList数组大小相同。SIB1在6.2.2节中定义。

当接收到 upperLayerIndication，因为这是列表，需要根据plmn-IdentityList判断其当前驻留的plmn对应的upperLayerIndication是否为true，若有则通知上层进入了可以提供5g capabilities的区域。

 

联通现网如下: 目前列表中只提供一个plmn的信息。

          plmn-IdentityList 
          {{ plmn-Identity 
              {
                mcc  {
                  4,
                  6,
                  0 },
                mnc  {
                  0,
                  1}
              },
              cellReservedForOperatorUse notReserved
            }
          }

所以现网plmn-InfoList 的长度也是1：

 plmn-InfoList-r15 
 {
    {
       upperLayerIndication-r15 true
    }
 }