Specifications

Interface Protocols
Operating Characteristics
3-10 68P81095E55-E August 08, 2000
Time Division Duplex (TDD) further reduces network’s packet overhead and
eliminates the need for RF duplexer on the MS. To reduce errors in propagation
delay and allow the mobile to re-tune, the radio link’s mobile receive packet is offset
ahead of the mobile transmit packet (Figure 3-7).
Figure 3-7 Time Division Duplex Operation
Tx
Rx
1
a
2
a
Tx
1
Tx
1
Tx
3
6
a
1
a
2
a
Rx
1
Rx
2
Rx
3
6
a
D
own
li
n
k
C
on
t
ro
l
s
i
gna
lli
ng an
d
voice packets from network
Uplink Control signalling and
voice packets to network
19ms delay for propagation
and mobile frequency changes