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The UE is known on a cell level in the SRNC for CELL_PCH, but it can only be reached via the Paging Channel (PCH). Therefore is the battery consumption of the UE very low because the Paging Channel includes Discontinuous Reception (DRX) functionality.

The UE also listens to system information on the BCH. A UE supporting the Cell Broadcast Service (CBS) is also capable of receiving BMC messages.

If the network wants to initiate any activity, it first needs to page the UE. When the UE receives the paging it changes to the CELL_FACH substate, and performs a Cell Update.

Whenever the UE wants to initiate any activity it triggers a switch to the CELL_FACH substate by performing a Cell Update.

Related Reading:

W-CDMA and cdma2000 for 3G Mobile NetworksW-CDMA and cdma2000 for 3G Mobile Networks
Introduction to Wideband Code Division Multiple Access (WCDMA)Introduction to Wideband Code Division Multiple Access (WCDMA)
WCDMA for UMTS: HSPA Evolution and LTEWCDMA for UMTS: HSPA Evolution and LTE
3G Evolution, Second Edition: HSPA and LTE for Mobile Broadband3G Evolution, Second Edition: HSPA and LTE for Mobile Broadband
WCDMA Design HandbookWCDMA Design Handbook

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