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Logical Channels
Within GPRS there are a
number of new logical channels, similar to the existing ones, but these
are only for GPRS. (NB These logical channels have been standardized.)
The new logical channels have been mapped onto the physical channels
that have been assigned for packet data, the physical channels denoted
as Packet Data Channels (PDCH), the logical channels that are mapped
onto these are :
-
Packet Common Control
Channels
-
PRACH : Packet Random
Access Channel (Uplink)
-
PPCH : Packet Paging
Channel (Downlink)
-
PAGCH : Packet Access
Grant Channel (Downlink)
-
PTCCH : Packet Timing
advance Control Channel (Up/downlink)
-
PNCH : Packet
Notification Channel (Downlink)
Broadcast Channel
-
PBCCH : Packet
Broadcast Control Channel (Downlink)
Packet Traffic Channels
-
PDTCH : Packet Data
Traffic Channel (Up/downlink)
-
PACCH : Packet
Associated Control Channel (Up/downlink)
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