Page can be originated
1. UTRAN
or
2. CN
If the UE is in idle mode, then CN will originate the page.
If the UE is in Cell_PCH or URA_PCH, then UTRAN will originate the page.
The UE location is known to the level of the cell in Cell_PCH.
The purpose of this state is to save power (performing DRX like idle mode)
but allow rapid network access to the UE by knowing that only one cell needs to be paged (and no RRC connection setup reqired.)
Cell_PCH
is
one of states in RRC connected mode.
In Cell_PCH, the UE has no uplink resources. The UE monitors the paging channel using the assigned discontinous reception (DRX) parameters.
The UE will entern into Cell_FACH
1. when it detects the cell change, it performs cell update in Cell_FACH
2. when it is paged by the UTRAN
When a paging arrives at a UE,
in idle mode, UE sends RRC connection establishment
in Cell_PCH and URA_PCH, the UE moves to Cell_FACH and sends Cell Update message with cause “paging response”
I heard that there is no much difference between idle and Cell_PCH from UE perspective.
In idle, UE is located within registration area.
In Cell_PCH, UE’s location is known in cell level.
Then, what about URA_PCH?
In URA_PCH, UE’s location is known in registration area level.
Then, is it true that there is no difference between idle and URA_PCH ?
It [...]
