WCMDA Paging
Paging
process in WCMDA or HSDPA system is called WCMDA Paging. The Paging
Channel (PCH) is a downlink transport channel. The PCH is always transmitted
over the entire cell. The transmission of the PCH is associated with the
transmission of physical-layer generated Paging Indicators, to support
efficient sleep-mode procedures.
Paging Channel selection
System information Block Type 5 (SIB 5) defines
common channels to be employed in Idle mode. The UE may use Discontinuous
Reception (DRX) in idle mode in order to reduce power consumption. When DRX is
used the UE needs only to monitor one Page Indicator, PI, in one Paging
Occasion per DRX cycle.
The Paging Indicator
Channel (PICH) is a fixed rate (SF=256) physical channel used to carry the
paging indicators.
Paging Procedure:
Basically two types of
Paging Procedures in WCMDA Paging.
1) Idle Mode Paging
2) Dedicated Mode Paging
2) Dedicated Mode Paging
Idle
mode paging is used when UE is in idle mode so we can say UE is in
Cell PCH or URA PCH.PAGING TYPE 1 message on an appropriate paging occasion on
the PCCH.
UE
dedicated paging procedure is used to transmit
dedicated paging information to one UE in connected mode in CELL_DCH or
CELL_FACH state. PAGING TYPE 2 message on the DCCH using AM RLC.
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