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our procedure enables the gateway to successfully face the challenge of any
amount of traffic load without degrading its performance.
Let us consider the second observation in the light of the discussion in
Section 3.3. There are 12 common messages for a normal 3G video call where
10 of them are responsible for call setup and are almost the same in the
case of all calls. So, these messages can be precompiled and can be stored
in the lookup table and then those can be directly retrievable (or reusable)
for the next incoming calls. Thus while processing the messages, the per-
centage of retrievable precompiled messages is 10/12 (83.3%). So, the perfor-
mance improvement should also be predicted to be improved up to 83.3%.
Our experimental results proves this prediction and it is visually obvious in
Figure 3.15.
Thus, if we consider a physical interpretation, the second observation implies
that the efficiency of call setup is improved appreciably. In other words, the
call setup time is reduced greatly when the gateway handles a large number
of calls.
Here another important advantage of our procedure may be predicted.
An appreciable amount of improvement in the conversation quality (for the
ongoing calls) can be achieved in our procedure. This is because our proce-
dure also uses the same lookup table approach for handling the post con-
nection messages too. So the system saves a lot of resources and time that
may eventually enable a better quality in the ongoing conversation. Thus
this suggested procedure claims better QoS. But, it is beyond the scope of our
laboratory experiment to provide the data in support of this claim. However
this claim can be proved when the gateway is deployed to handle high call
traffic situation in real life applications, for example, by a commercial 3G
service provider.
3.4.5 Summary
In this section we have presented our success of attaining appreciable
improvement in robustness and efficiency of the multimedia gateway
that is suitable for handling high call traffic in a telecommunication sce-
nario. We adopt an efficient compile-store-reuse model for speeding up
the process of encoding the ITU-T H.245 ASN.1 formatted messages in
to a binary stream. In this method, H.245 sets of messages are compiled,
used, and stored in a table. For encoding further incoming messages, the
table is queried and the matching result is used instead of recompiling the
messages again and again. Experimental results show that our algorithm
greatly improves call handling efficiency of a 3G gateway. Thus, we have
proved that our lookup table-based message encoding algorithm can pro-
vide stable performance and a satisfactory QoS assurance even under high
traffic conditions. Also our method is tested to be fully compatible with
existing 3G protocols.
