Section: 12.2 CN Domain Identifier
Content: A CN Domain Edge Node is identified within the UTRAN by its CN Domain Identifier. The CN Domain identifier is used over UTRAN interfaces to identify a particular CN Domain Edge Node for relocation purposes. The CN Domain identifier for Circuit Switching (CS) consists of the PLMN-Id and the LAC, whereas for Packet Switching (PS) it consists of the PLMN-Id, the LAC, and the RAC of the first accessed cell in the target RNS. The two following CN Domain Identifiers are defined: - CN CS Domain-Id = PLMN-Id || LAC - CN PS Domain-Id = PLMN-Id || LAC || RAC The LAC and RAC are defined by the operator, and set in the RNC via O&M. For the syntax description and the use of this identifier in RANAP signalling, see 3GPP TS 25.413[ UTRAN Iu interface Radio Access Network Application Part (RANAP) signalling ]  [17].