Next generation mobile systems

Mobile communications will continue to greatly change
the way of people’s life. The tremendous demands from
social market are pushing the booming development of
mobile communications faster than ever before, leading to
plenty of new advanced techniques emerging. Various
mobile devices, wider transmission bandwidth, manifold
wireless and wired networks, and more powerful appliances’
processing capability, together with advances in computing
technology have brought more and more miscellaneous
services to be delivered with more excellent quality.

Next generation mobile systems need the support of all
the advances on new theories, algorithms, architectures,
standards, and protocols. In the near future, more and more
Internet based services like web service can be smoothly
accessed with various mobile devices through the wide
deployed wireless networks. At present, 3G mobile
communications systems are just at the beginning to be
deployed for multimedia data applications, while research
on the fourth-generation (4G) mobile communications has
begun to pave the way for the future [1, 2]. The mobile
personal telecommunications and wireless computer
networks are converging in the coming new generation of
mobile communications. Future mobile communications
systems evolve with the trend of global connectivity through
the internetworking and interoperability of heterogeneous
wireless networks. Roaming in such network architectures is
a very complex situation and it causes many new problems.