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Wireless communication technology has rapidly increased in the last few decades. People wish to use their network terminals (laptops, PDAs, etc.) anywhere and anytime. Wireless connectivity has given users the freedom to move where they desire. There exist numerous different wireless networks varying in the way the nodes interconnect. They can be broadly classified in two categories Networks with fixed infrastructure and Ad hoc wireless networks. Typical for networks with fixed infrastructure is using of access points. An Access Point (AP) can act as a router in the network, or as a bridge. Examples for this type of networks are GSM and UMTS cellular networks.
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