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The P-TMSI is used as a temporary identity to contact and identify a user accessing the network. Its used in paging and attaching with the Core network. as well as redirection in the case of node failure in SGSN in Pool.. But not limited to either..
P-TMSI will be used for paging & RAU Updates.
A packet temporary mobile subscriber identity (P-TMSI) is assigned to a GPRS MS at the time of GPRS attach
A packet temporary mobile subscriber identity (P-TMSI) is assigned to a GPRS MS at the time of GPRS attach. Like TMSI, P-TMSI is used to avoid transmitting IMSI over the air interface. P-TMSI is of local significance and is applicable in the area served by an SGSN. If the MS moves out to a new SGSN area, the current serving SGSN assigns a new P-TMSI to the MS.
