If the RA is configured in both 2G and 3G, the SGSN now supports paging in both the RATs. In previous releases common Routing Area across 2G and 3G was not supported completely. Paging was done only in the last known RAT and power-off detach from other RAT was not supported.
With the introduction of this feature, the following enhancements have been made:
If paging has to be done in RA which is common across the RATs, the SGSN supports paging initiation in both the RATs.
The SGSN accepts power-off detach from the common RA.
If the MS is in STANDBY or PMM-IDLE state and a downlink packet arrives at the SGSN, paging is done. This is applicable for both A/Gb and Iu modes.
GPRS detach (power-off) may be initiated by the MS, but as the request is received in switched off mode the core network does not send a Detach Accept. When the Routing Area is shared across (Iu/Gb), the Detach Request is accepted at any of the modes and the subscriber details are cleared.