 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| – |
Broadcast
Control Channel (BCCH) - downlink
|
|
|
|
n |
carries
general information including parameters to control cell
|
|
selection,
control channel configuration, random access
|
|
|
parameters,
and beacon frequencies of neighboring cells
|
|
|
n |
one
message (spread over 4 bursts every 51 frame cycle
|
|
| – |
Paging
Channel (PCH) and Access Grant Channel
|
|
|
|
(AGCH)
- downlink
|
|
|
|
n |
time
separation between PCH and AGCH depends on cell
|
|
|
parameters
|
|
|
n |
discontinuous
reception increases battery life by dividing PCH
|
|
|
into
paging sub-channels
|
|
|
– |
mobiles
belong to sub-channels in pre-determined way
|
|
|
|
n |
smaller
PCH/AGCH possible, of 1/3 capacity
|
|
|
n |
PCH/AGCH
may be extended in up to three extra TNs along
|
|
|
with
BCCH and RACH on the uplink
|
|
