Making RAN Backhaul Work Over Satellite |
Bandwidth Optimizer Overview
The Hughes solution for RAN backhaul incorporates an appliance that not only converts the cellular traffic to IP for transmission over satellite but also optimizes both the data and control channels to significantly reduce the traffic sent over the space link. Key functions of the optimizer are:
- Reducing voice channel bandwidth
- Silence/idle frames are suppressed at source and regenerated at the destination
- Optimizing A.bis signaling bandwidth
- TRX signaling data is extracted out of TRX channels and statistically multiplexed destination
|
 |
|
Protocol |
TYPICAL B/W |
OPTIMIZED B/W |
SAVINGS |
|
Q&M Signaling |
64kbps |
<8kbps |
87.5% |
|
TRX Signaling |
64kbps |
<8kbps |
87.5% |
|
GSM-FR/EFR + SID |
16kbps |
16kbps |
0% |
|
Duplicate SID |
16kbps |
2kbps |
87.5% |
|
Idle Frames |
16kbps |
1kbps |
93.5% |
|
V.110 (8kbps call) |
16kbps |
8kbps |
50% |
|
V.110 (16kbps call) |
16kbps |
15kbps |
10% |
|
GPRS (C1, C2) |
16kbps |
16kbps |
0% | | |
|
These techniques deliver up to 50% bandwidth savings over traditional SCPC links. The above table shows the typical savings for various A.bis protocols. | |