【5G學習筆記-1】 NSA upperLayerIndication

 upperLayerIndication出現在PLMN-InfoList-r15中。

在36.331 6.3.1節 中定義 (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
}

緊接着表格SystemInformationBlockType2 field descriptions中定義如下:

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的個數和SIB1中plmn-IdentityList數組大小相同。SIB1在6.2.2節中定義。

當接收到 upperLayerIndication，因爲這是列表，需要根據plmn-IdentityList判斷其當前駐留的plmn對應的upperLayerIndication是否爲true，若有則通知上層進入了可以提供5g capabilities的區域。

 

聯通現網如下: 目前列表中只提供一個plmn的信息。