Update gprs location call flow of lte5/28/2023 ![]() It then transmits this data to the new SGSN. ![]() If the HLR receives an indication from an SGSN different from the one saved in its table for a GPRS subscriber, it requests the old SGSN to remove GPRS data related to this subscriber. The new SGSN then updates location information in the HLR database via the MAP protocol using the SS7 network. When the new SGSN has retrieved MM and PDP context information, it updates the data related to the new SGSN in the GGSN. If the old SGSN has saved in its buffer some packets addressed to the MS, it forwards the packets toward the new SGSN. If the old signature does not match the one saved in the old SGSN, the new SGSN performs an MS authentication procedure. ![]() Thus the new SGSN is able to contact the old SGSN from the RAI identifier in order to retrieve MM and PDP context information related to the MS identified in the old SGSN by its old P-TMSI. This procedure is called an inter-SGSN RA update procedure. In this case, the SGSN needs to contact the old SGSN, the GGSN, and the HLR in order to retrieve information and update the routing information. Inter-SGSN RA Update When the SGSN detects that the old RA sent by the MS is handled by another SGSN, the SGSN has no information about this MS. Note that a periodic RA update is always an intra-SGSN RA update procedure.
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