Information Technology Reference
In-Depth Information
that in order to support various network technologies and to handle high
call traffic conditions, a robust and efficient gateway is required for the uni-
versal adaptability and transcoding. To achieve the performance improve-
ment of the gateway, we focus on efficiently implementing the H.245, which
is the main call handling and signaling protocol. In our method, sets of
H.245 messages are compiled, used, and stored in a table so as to be reused
for further incoming calls. After implementing this procedure, we have suc-
cessfully tested our 3G-IP gateway that is robust enough for smoothly han-
dling up to one million concurrent calls. It is also experimentally verified
that our gateway provides the feature of invariant call setup time even in
high traffic conditions. As ubiquitous communications among the heteroge-
neous networks are in demand today and our gateway will play a key role
in this area.
3.4.1 introduction
These days, mobile devices like iPods, personal digital assistant (PDAs), smart-
phones, tablet PCs, and high end mobile phones have become inexhaustibly
essential in day-to-day life. It is because these equipments provide not only the
features like phone calling, music playing, and photo and video capturing, but
they also do have incredible features like seamless accessibility and connec-
tivity that enables the modern life to be pervasively connected to any equip-
ment around him or to any point in this world. These advanced communication
devices possess the capability of connecting through various network types such
as, infrared, Bluetooth, cellular networks, traditional landlines, and the Internet.
On the mobile devices, the demand of multimedia applications such as video
conferencing, video on demand (VOD), internet protocol television (Internet
Protocol (IP) TV), mobile trading, online games, and geographical and vehic-
ular information systems have become a general trend in today's networked
lifestyle. Moreover, if we study the current technological trend, it is prominent
that there is a high demand on the complete convergence and unification of the
traditional telephone, mobile phone, and the Internet networks so as to provide
any type of seamless services to subscribers on any device at any place or time.
This ubiquitous communication environment among the heterogeneous
networks is in demand today. In this situation, a gateway is required for
bridging these gaps between different network domains (e.g., PSTN and IP)
[23-26]. As the ubiquitous communication is expected to grow rapidly and is
researched extensively, we believe our gateway will play the key role in this
sort of application.
Basically, communication networks can be classified into two categories,
such as CSN and PSN. The telecommunication networks mainly use the
circuit-switching technique due to its service reliability and provision of
fixed bandwidth. On the other hand, the internet uses the packet-switching
method in order to deal with the burst traffic pattern and working over a
range of available bandwidth in the network.
