Analysis of Quality of Service in Wimax networks

Throughput for all codecs for UGS traffic
0
100
200
300
400
500
600
2
4
6
8
10
N umbe r of node s
G.711
G.723
G.723.2
G.729
G.729.2
Service Flow Type: Unsolicited Grant Service(UGS) 
VOIP Codec: All 
Figure 22 Variation of Throughput across different VOIP codecs 

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As seen from Table 3, G.711 codec has the highest packet size and the higher 
transfer rate. This is reflected in the higher throughput. The next higher throughput is for 
G.729. The G732.2 codec has the lowest throughput. 
Packet Loss for all codecs for UGS traffic
0
0.0002
0.0004
0.0006
0.0008
0.001
0.0012
0.0014
0.0016
2
4
6
8
10
N umbe r of node s
G.711
G.723
G.723.2
G.729
G.729.2
Figure 23 Variation of Packet loss across different VOIP codecs 
Service Flow Type: Unsolicited Grant Service(UGS) 
VOIP Codec: All 

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Average jitter for all codecs for UGS traffic
0
1E-10
2E-10
3E-10
4E-10
5E-10
6E-10
7E-10
2
4
6
8
10
N umbe r of node s
G.711
G.723
G.723.2
G.729
G.729.2
Figure 24 Variation of Average jitter across different VOIP codecs 
Figure 23 shows the packet loss variation.  There is no significant packet loss for 
codecs other than G.711. The packet size, as well as, the rate of packet transfer in G.711 
codec is highest. This results in some packet loss as the number of nodes increases. 
Figure 24 shows the variation of average delay across different VOIP codecs.
The values are very small and the pattern indicated is not significant. For all practical 
purposes, the average jitter is negligible for all the codecs even as the number of nodes 
increases 
Service Flow Type: Unsolicited Grant Service(UGS) 
VOIP Codec: All 

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