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MIN Based IMSI And TRUE IMSI – CDG

MIN Based IMSI And TRUE IMSI – CDG

Engineering Services

Engineering Services ahunter@qualcomm.com Special or Wildcard MCC & IMSI_11_12 If the received MCC/IMSI_11_12 is set to all '1's, then MS sets • IMSI_O = IMSI_M and • Mobile Country Code (MCCs = MCC_M) and • IMSI 11th & 12th digits (IMSI_11_12s = IMSI_M_11_12p) otherwise: • Mobile Country Code (MCCs = MCCr) and • IMSI 11th and 12th digits (IMSI_11_12s = IMSI_11_12r) Notes • MCC_M is the MCC programmed for the MIN • MCCr and IMSI_11_12r denotes the MCC and IMSI_11_12 received from the base station • MCCs and IMSI_11_12s are the values the MS stores for use • See TIA/EIA 95B SECTION 2.6.2.2.5 Extended System Parameters Message International Roaming 6

Engineering Services ahunter@qualcomm.com IMSI_M, IMSI_T & IMSI_O MIN Based IMSI (IMSI_M) • An IMSI that contains a MIN in the lower ten digits of the NMSI. • An IMSI_M can be a class 0 or a class 1 IMSI. • The MIN is the forms the last 10 digits of IMSI_M (IMSI_M_S) • When IMSI_M is not programmed, it is set to all zeros except for the four leastsignificant digits which are an encoded form of the ESN. True IMSI (IMSI_T) • An IMSI that is not associated with the MIN. • An IMSI_T can be a class 0 or class 1 IMSI. • When IMSI_T is not programmed, it is set to all zeros except for the four leastsignificant digits which are an encoded form of the ESN. Operational IMSI (IMSI_O) • MS sets its operational IMSI value. • IMSI_O can be either the IMSI_M or the IMSI_T • The use of IMSI_M or IMSI_T is determined by the IMSI_T_SUPPORTED field of the Extended System Parameters Message. International Roaming 7

CDG INTERNATIONAL ROAMING TEAM - CDMA Development Group
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