SAI – Service Area Identifier
The Service Area Identifier is used to identify an area consisting of one or more cells belonging to the same LA (Location Area). Such an area is called a Service Area and can be used for indicating the location of a UE (User Equipment) to the CN (Core Network). The SAC (Service Area Code) together with the PLMN -Id (Public Land Mobile Network Identifier) and the LAC (Location Area Code) will constitute the Service Area Identifier. SAI = PLMN-Id + LAC + SAC.
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