GSM Architecture, Protocols and Services Third 3rd Edition Book
Using current wireless communication systems, the most popular of which is GSM (Global System for Mobile Communication), we see that we have the freedom to not only roam within a network, but also between different networks, and that we can in fact communicate (almost) everywhere (unless we are in one of the rare spots still without GSM coverage today), with (almost) everybody (unless our desired communication partner is in one of the rare spots mentioned above or chooses not to be reachable), and at (almost) any time (unless we forgot to pay our last phone bill and the operator decides to lock us out). If there is one major aspect still missing in order to make our wireless experience flawless, it is the large (albeit diminishing) gap between data rates available through wireless services and those available through wired services, such as Digital Subscriber Line (xDSL). This and the limited capability of data representation at the mobile terminal (mostly due to the limited size of mobile phones) is one of the main challenges for future developments in wireless communication.
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