User's Manual

U-NII Config & User Guide 5.2 Axxcelera Broadband Wireless
arrive at the AP properly aligned, some active compensation of propagation delay is performed.
An SU must delay compensate before it can transmit data, if it was allowed to transmit without
delay compensating it would confuse the AP because it would be receiving cells out of order.
As you can see in this diagram the dark green portion of the MAC frame represent time
delays.
FD RG ACK ACK Cell Cell - AckRR Cell Cell -
FD RG ACK ACK Cel l Cel l - Cel l Cel l
FD RG ACK ACK Cell Cell - AckRR
AP
timing
WT
1
timing
WT
2
timing
max propagation
delay
AP
timing
WT
1
timing
WT
2
timing
max propagation
delay
Cell
ACKRR
Cell -
-
FD RG ACK ACK Cell Cell - AckRR -
FD RG ACK ACK Cel l Cel l -
FD RG ACK ACK Cell Cell - AckRR Cell
RR
Cell -
-CellACK Cell
Cell Cell
March 10, 2003 Company Confidential Page 131 of 149