name: SAI
full_form: Service Area Identifier
context: PLMN N have roaming agreement and are aware of the SAPC codes for each other's PLMN. Scenario 1: SS7 support services example using point code (see figure 1) - Operational steps: - SUA node in PLMN N receives IMSI (registration request) from MS. - PLMN N determines that the subscriber belongs to a PLMN with legacy SS7 support only. - SUA node looks-up corresponding SAPC (E.164 number = 1-817-822-1999) in local DB/ENUM. - SUA node uses this as the unique E.164 (ISDN) number for the PLMN 1 in ENUM query message. - SUA node sends an ENUM query message (1). This is routed over other ENUMs to the local ENUM of PLMN 1. - Local ENUM/DB in PLMN 1 receives the message (1) and looks up the services/protocols (including SUA-SG node's IP address) corresponding to SAPC received in the ENUM query. - Local ENUM responds with message (2) with all servfices/protocols associated with SAPC of PLMN 1. - Message (2) is routed over the IP network to PLMN N. - PLMN N sends the SUA message (3) to PLMN 1
description: The Service Area Identifier (SAI) is a unique identifier used to address a Home Node B (HNB) by the Cell Broadcast Centre (CBC) for the purposes of Cell Broadcast. It is composed of the PLMN, LAC, and SAC, and any change in the LAC causes a change in SAI that needs to be communicated to both the HNB-GW and the CBC.
explanation: The context explicitly states that SAI is used as an identifier to address HNBs, making it fall under the category of identifiers.
section_title: 7.1.2.1	Use and Change of LACs
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biotag_Description: O,B-Parameter,I-Parameter,I-Parameter,O,O,O,O,O,O,O,O,O,B-Network Function,I-Network Function,I-Network Function,O,O,O,B-Network Function,I-Network Function,I-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,B-Network Function,O,O,O