* Idle state - The GPRS/EGPRS MS is turned on but not GPRS attached. The GPRS/EGPRS MS is "invisible" to GPRS/EGPRS, i.e. outside the GPRS/EGPRS coverage area.
* Stand by state - The GPRS/EGPRS MS is attached to the GPRS MM and sends RA updates to the SGSN and performs GPRS/EGPRS cell selection and re-selection.
* Ready state - A packet transfer is ongoing or has recently ended. A READY timer with fixed value defines how long time the GPRS/EGPRS MS shall remain in ready state after transfer. The GPRS/EGPRS MS performs cell update when changing cell in ready state.
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