Analysis of Quality of Service in Wimax networks

Num ber of nodes
%
 
Figure 35 Packet Loss with number of nodes for UGS service flows 
Figure 35 shows packet loss as it varies when number of nodes with video traffic 
over UGS service flow increases. Very low rate of packet loss is observed. This is 
because in UGS service flow, BS allocates bandwidth for the MS to send fixed sized 
packets at a fixed interval. The bandwidth is already allocated and this reduces the 
effective packet loss. 
Figure 36 shows the variation of average jitter with number of nodes for UGS 
service flow. The average jitter value varies within a very small range. There is no real 
Service Flow Type: Unsolicited Grant Service (UGS) 
Traffic Type: Video 
Video Parameters:64kbps H.263 

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pattern in the variation since the values are practically insignificant. For UGS service 
flow, the average jitter observed is very small and does not show any relation to the 
number of nodes. 
Average Jitter
0.0089
0.009
0.0091
0.0092
0.0093
0.0094
0.0095
0.0096
0.0097
1
2
3
4
5
10
Number of nodes
seco
n
d
s
 
Figure 36 Average Jitter with number of nodes for UGS service flows 
Service Flow Type: Unsolicited Grant Service (UGS) 
Traffic Type: Video 
Video Parameters:64kbps H.263 

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Average Delay
0.0118
0.0119
0.012
0.0121
0.0122
0.0123
0.0124
0.0125
0.0126
1
2
3
4
5
10
Num ber of nodes
seco
n
d
s