Section: 4.7.1.5.1 P-TMSI handling in A/Gb mode
Content: If a new P-TMSI is assigned by the network the MS and the network shall handle the old and the new P-TMSI as follows: Upon receipt of a GMM message containing a new P-TMSI the MS shall consider the new P-TMSI and new RAI and also the old P-TMSI and old RAI as valid in order to react to paging requests and downlink transmission of LLC frames. For uplink transmission of LLC frames the new P-TMSI shall be used. NOTE: For the case of multiple consecutive P-TMSI REALLOCATION COMMAND messages, the old P-TMSI is the latest P-TMSI included by the network in a previous message different from the multiple consecutive P-TMSI REALLOCATION COMMAND messages. The MS shall consider the old P-TMSI and old RAI as invalid as soon as an LLC frame is received with the local TLLI derived from the new P-TMSI. Upon the transmission of a GMM message containing a new P-TMSI the network shall consider the new P-TMSI and new RAI and also the old P-TMSI and old RAI as valid in order to be able to receive LLC frames from the MS. The network shall consider the old P-TMSI and old RAI as invalid as soon as an LLC frame is received with the local TLLI derived from the new P-TMSI.