However, there is still a dramatic increase in
the number of users who subscribe to mobile
broadband systems every year. More and morepeople crave faster Internet access on the move,
trendier mobiles, and, in general, instant communication
with others or access to information.
More powerful smartphones and laptops are
becoming more popular nowadays, demanding
advanced multimedia capabilities. This has
resulted in an explosion of wireless mobile
devices and services. The EMO pointed out that
there has been a 92 percent growth in mobile
broadband per year since 2006 [2]. It has been
predicted by the Wireless World Research
Forum (WWRF) that 7 trillion wireless devices
will serve 7 billion people by 2017; that is, the
number of network-connected wireless devices
will reach 1000 times the world’s population [4].
As more and more devices go wireless, many
research challenges need to be addressed.