Voice Capacity analysis over 802.11. Introducing VoIP and WLans. IEEE 802.11 based Wireless Local Area Networks (WLANs) are becoming popular While WLANs continue to be predominantly data centric, there is growing interest in using WLANs for voice, especially in enterprise markets.
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(WLANs) are becoming popular
128 kbps- full duplex
Approx. 85 calls supported
However no more than 12 calls can be supported !!!Mapping Voice over 802.11
As packetization interval increases the capacity of voice calls increases
Efficiency increases by decreasing the no of packets per second (reducing the no of times the overhead is incurred)
G726 : 13Kbps
74 – 10ms -> 59.6Kbps
91 – 20ms -> 36.4Kbps
Packetization interval = 10ms; CFP = 20 ms calls increases
- CF polls are wasted and most packets are sent in CP
- Aggravated if more STAs
- CFP will be shortened and CP will be increased