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The science and technology is developing day by day leading to expand and forcing to reshape user's living standards. The main aspects leading to deployment of a wide array of wireless and mobile networks are advances in miniaturization, low power circuit design and development in radio access technologies and increase in user demand for high speed internet access. The varying wireless technologies are driving today's wireless networks to become heterogeneous, i.e., the network comprised of two or more different access network technologies. Heterogeneous networks have created many challenges such as mobility management, handoff, resource management, location management, providing QoS, security and pricing.
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