Section: 8.18 Serving Network
Content: Serving Network is coded as depicted in Figure 8.18-1. Figure 8.18-1: Serving Network If an Administration decides to include only two digits in the MNC, then bits 5 to 8 of octet 6 are coded as "1111". Unless specified otherwise in the specification, this IE contains the serving core network operator ID provided by the MME, S4-SGSN or ePDG, or the PLMN identity of the selected PLMN used for 3GPP-based access authentication provided by the TWAN. NOTE: The serving core network operator ID is the PLMN ID of the MME, S4-SGSN or ePDG which is currently serving the UE. An S4-SGSN/MME which supports multiple PLMN IDs is considered as logically different S4-SGSNs/MMEs.