 |
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| n |
Logical
channels:
|
|
|
– |
packet
common control channels (PCCCH), UL+DL
|
|
|
n |
packet
random access channel (PRACH), UL
|
|
|
n |
packet
paging channel (PAGCH), DL
|
|
|
|
n |
packet
access grant channel (PAGCH), DL
|
|
|
n |
packet
notification channel (PNCH), DL
|
|
|
– |
packet
broadcast control channel (PBCCH), DL
|
|
|
– |
packet
data traffic channel (PDTCH), UL+DL
|
|
|
n |
data
rates 9.05 to 21.4 kbps, depending on channel coding
|
|
|
– |
packet
associated control channel (PACCH)
|
|
| n |
Physical
channels:
|
|
|
|
– |
PCCCH
and PBCCH combined into same 51 multiframe
|
|
|
– |
PDTCH
is mapped to one physical channel
|
|
|
– |
dynamic
or permanent channel allocation for GPRS possible
|
|
– |
if
no PCCCH possible, MSs park on CCCH
|
|
