2. WP-CDMA Distinguishing Features
1. Uplink Common Packet Channel (All Rates)
Common Packet Channel will transport all data rates up to
and including Mbps.
Constant Power Level Preamble with 16 possible sequences
Closed Loop Power Control, Preamble Ramp-up mechanism
Fast L1 ACK mechanism (within 250 micro-seconds)
Collision Detection with Low Feedback Delay (2 ms)
Downlink Common Power Control Structure
2. Common Control Channel in the Downlink
3. Intra-frequency Hard Handover
4. Quick Handover
5. Structure of the WP-CDMA CCPCH
(Common Control Physical Channel)
TM Common Pilot for coherent demodulation
Adjustable Power SCH1 And SCH2 for faster initial cell search
6. Multi-code Option for Higher Rates
The relationship between the VSF and number of multi-codes is the subject of
further study
7. Higher APC Rates
8. Removal of Link Maintenance Channel

3. WP-CDMA Distinguishing Features DL Common Control Channel
There are N power control channels associated with each user. These power
control channels are time multiplexed.
The pilot symbols required for coherent detection are time multiplexed with the
other control information in the Common Control Channel in the DL direction.
Messages such as L1 ACK (Busy). Free. CD. ARQ ACK/NAK will be sent through
the Common control Channel as well. Some of the messages such as L1 ACK,
TPC and CD bits are not interleaved since fast response time is required.
L1 ACK requires a predetermined time allocation in the .625 ms slot. This is
required every other slot at the end of the DSMA/CDMA-CD mini-slot which
corresponds to the .25 ms guard time.
Other less delay sensitive messages and commands go through the signaling
channel which is time multiplexed with other information in the Common Control
Channel.

4. DL Common Control Slot Structure
Pilots
NPilots
Slot 0
TFI
PC1
PC2 …
PCn CD CD CD CD
SIGNALING
SF=64
SF=TBD
SF=TBD
625 µs
Pilots
NPilots
L1 ACK
NACK
Slot 1
TFI
PC1
PC2 …
PCn
SIG
SIG
SIG
375 µs