Question: What is used for addressing purposes at the RR sublayer in A/Gb mode?
Option 1: Temporary Logical Link Identity (TLLI)
Option 2: Packet TMSI (P-TMSI)
Option 3: Radio Network Temporary Identity (RNTI)
Option 4: International Mobile Subscriber Identity (IMSI)
Explanation: In A/Gb mode, a temporary logical link identity (TLLI) is used for addressing purposes at the RR sublayer, whereas P-TMSI is used in the GMM sublayer for identification of an MS. RNTI is used in Iu mode to identify a user between the MS and the UTRAN or GERAN. IMSI is not directly related to addressing purposes at the RR sublayer.