Location management messages
The location-management procedure is performed during the network-requested PDP context activation procedure if the GGSN does not have an SS7 MAP interface (i.e., Gc interface). It is used to transfer location messages between the GGSN and a GTP-MAP protocol-converting GSN in the GPRS backbone network.
Location management subprocedures are used between a GGSN that does not support an SS7 MAP interface (i.e., Gc interface) and a GTP-MAP protocol-conversing GSN. This GSN supports both Gn and Gc interfaces and is able to perform a protocol conversing between GTP and MAP.
| Message Type | Used By | Description |
|---|---|---|
| Send Routing Information for GPRS Request (32) Send Routing Information for GPRS Response (33) |
GTP-C |
Sent by the GGSN to obtain location information for the MS. This message type contains the IMSI of the MS and Private Extension. Also written as Send Routing Information for GPRS Request and Send Routing Information for GPRS Response. |
| Failure Report Request (34) Failure Report Response (35) | GTP-C | Sent by the GGSN to the HLR when a PDU reject message is received. The GGSN requests the HLR to set the flag and add the GGSN to the list of nodes to report to when activity from the subscriber that owns the PDP address is detected. The message contains the subscriber IMSI and Private Extension |
| Note MS GPRS Present Request (36) Note MS GPRS Present Response (37) |
GTP-C | When the HLR receives a message from a mobile with MDFG set, it clears the MDFG and sends the Note MS Present message to all GGSNs in the subscriber’s list. This message type contains subscriber IMSI, GSN Address and Private Extension |