Section: 30.2 Structure of TMGI
Content: Temporary Mobile Group Identity (TMGI) is used within MBS to uniquely identify a broadcast MBS session or a multicast MBS session. TMGI is composed as shown in figure 30.2.1. Figure 30.2.1: Structure of TMGI The TMGI is composed of three parts: 1) MBS Service ID consisting of three octets. MBS Service ID consists of a 6-digit fixed-length hexadecimal number between 000000 and FFFFFF. MBS Service ID uniquely identifies an MBS service within a PLMN. 2) Mobile Country Code (MCC) consisting of three digits. The MCC identifies uniquely the country of domicile of the MB-SMF, except for the MCC value of 901, which does not identify any country and is assigned globally by ITU; 3) Mobile Network Code (MNC) consisting of two or three digits (depending on the assignment to the PLMN by its national numbering plan administrator). The MNC identifies the PLMN which the MB-SMF belongs to, except for the MNC value of 56 when the MCC value is 901, which does not identify any PLMN. For more information on the use of the TMGI, see 3GPP TS 23.247[ Architectural enhancements for 5G multicast-broadcast services ]  [140]. NOTE: The structure of TMGI for MBS in 5GS is similar to the structure of TMGI for MBMS in EPS defined in clause 15.2. In a SNPN (Stand-alone Non-Public Network), TMGI is used together with NID (Network Identifier) to identify an MBS Session.