Information Technology Reference
In-Depth Information
100
90
80
70
10,00,000
samples
60
50
8,00,000
samples
40
4,00,000
samples
30
20
1,00,000
samples
10
0
0 0 0 0 0 0
Fraction of message found from the lookup table (%)
60
70
80
90
100
Figure 3.15
Experimental result of message processing in table lookup procedure. (From Tso, F. P., “WTS”
Conference of IEEE, 2008.)
In our experiment, for the same set of messages, we calculated the time
taken for message encoding in the traditional approach (
t
1
) and that in
our proposed approach (
t
2
), respectively. The performance enhancement
(in terms of reducing call setup time) can be calculated by the following
formula:
tt
t
−
1
2
× %.
100
1
If the result is positive, then it is obvious that we have achieved the enhance-
ment of the performance.
The experimental result of performance enhancement in our lookup
table method of H.245 message processing is illustrated in Figure 3.15.
From this graph, two important observations can be noted. First, the per-
formance remains almost unchanged when the number of calls is increas-
ing. Second, the performance is linearly and proportionately improving
with the fraction of messages found in the lookup table. That means the
performance of the gateway increases when more calls encountered go
through it.
The first observation just proves the very purpose of the currently
introduced message processing approach that is, in this approach, the call
handling performance of the 3G gateway remains invariant in spite of the
number of concurrent calls increasing consistently to a large amount. So
