Wireless Oom

The paging occasion

is

the SFN of the frame of which the UE must monitor the PICH to see whether a paging message is being sent to the UE.

For FDD,

paging occasion (SFN) = (IMSI div K) mod (DRX cycle length) + n* DRX cycle length

where n=0, 1, 2, up to a maximu such that SFN is valid (i.e. <4096) and

K is the number of SCCPCHs that carry a PCH.