VoIP over b (Part 2)
Bandwidth Usage How do we determine the the maximum amount of bandwidth for one call? Account for constant signals (Beacons) Theoretcial and Experimental Calculation Account for the packets that theoretically should be transmitted for one call Account for the packets that theoretically should be transmitted for one call Use a packet Sniffer to sniff packets on the wireless link and calculate the bandwidth consumed Use a packet Sniffer to sniff packets on the wireless link and calculate the bandwidth consumed
Beacons Frequency 100ms Packet Size = 240 bytes Beacons/sec= 1/.1 = 10/sec (10*240bytes*8bits)/10 6 = Mbit/sec
1 Call Theoretical Bandwidth 50 Packets/sec Voice Data G.711 Total bytes to transmit all voice packets = (100 * 380) + (102 * 158) =54563 bytes/sec Theoretical Bandwidth of one call = (54563*8) / 10 6 = Mbit/sec
1 Call Experimental BW Compare to Mbit / Sec
2 Call Theoretical BW Theoretically expected value = (2 * ) = Mbit/sec
2 Call Experimental BW Compare to Mbit / sec
Future Continue the research on maximum calls supportable by b and use a packet generator to simulate the phone traffic Use results as part of a paper on VoIP over a wifi network