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According to the B3G concept, diverse Radio Access Technologies (RATs) can converge into one composite radio environment, where the user is "always best connected" and can move between the various technologies seamlessly. Cognitive wireless networks, have emerged as a complementary concept to B3G networks. In general, cognitive systems establish their behaviour, in a reactive or proactive manner, based on external triggers (environment), as well as their goals, principles (policies, rules), experience and knowledge. This requires, among other things, advanced terminal management functionality for dynamically selecting and adapting to the most appropriate technology, in a seamless, transparent and robust manner.
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