14 GTP Parameters

29.0603GPPGeneral Packet Radio Service (GPRS)GPRS Tunnelling Protocol (GTP) across the Gn and Gp interfaceRelease 17TS

The GTP system parameters defined here and their recommended values shall not be fixed, but shall be possible to configure as described in clause "Reliable delivery of messages".

14.1 Timers

The timer T3-RESPONSE holds the maximum wait time for a response of a request message.

The timer T3-TUNNEL holds the time when PDUs shall be forwarded from the old SGSN to the new SGSN. The timer is started in the old SGSN when it receives a GTP SGSN Context Request message and there is at least one active PDP context. GTP shall indicate to the upper layer when the timer has expired. The recommended timer value is 20 s.

14.2 Others

The counter N3-REQUESTS holds the maximum number of attempts made by GTP to send a request message. The recommended value is 5.