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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.
