3.4.25 GPRS suspension procedure

3GPP44.018GSM/EDGE Radio Resource Control (RRC) protocolMobile radio interface Layer 3 specificationRelease 17TS

3.4.25.1 General

This procedure enables the network to suspend GPRS services packet flow in the downlink direction. The support of this procedure is conditional to the support of GPRS by the mobile station.

When a mobile station which is IMSI attached for GPRS services (see 3GPP TS 24.008) enters the dedicated mode, and when the mobile station limitations make it unable to handle both dedicated mode and either packet idle mode or packet transfer mode simultaneously, the mobile station shall perform the GPRS suspension procedure.

The RR sublayer of the mobile station shall indicate a RR GPRS suspend condition to the MM sublayer, see 3GPP TS 24.008.

3.4.25.2 MS in class B mode of operation

The GPRS suspension procedure shall be used to suspend GPRS services when the mobile station is in class B mode of operation and a circuit switched service is initiated. It is also used when a mobile station in CS/PS mode of operation in UTRAN reverts to class B mode of operation in GSM.

The GPRS suspension procedure is initiated by the mobile station by sending a GPRS SUSPENSION REQUEST message with the appropriate suspension cause. This can be done as early as possible after access but shall be done after sending a CLASSMARK CHANGE message.

3.4.25.3 Dual transfer mode not supported

The GPRS suspension procedure shall be used to suspend GPRS services:

a) when the mobile station in a class A mode of operation is handed over to a cell where the support of Class A mode of operation is not possible (e.g. a DTM mobile station entering a cell not supporting DTM);

b) when the GPRS attached mobile station is in a cell that does not support DTM and a circuit switched service is initiated.

In case a), when the mobile station concludes that DTM is not supported in the new cell after the handover procedure is completed, it shall initiate the GPRS suspension procedure by sending a GPRS SUSPENSION REQUEST message with the suspension cause set to "DTM not supported in the cell".

In case b), the GPRS suspension procedure is initiated by the mobile station by sending a GPRS SUSPENSION REQUEST message with the suspension cause set to "DTM not supported in the cell". This can be done as early as possible after access but shall be done after sending a CLASSMARK CHANGE message.