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Cross-Layer Design (CLD) is a new paradigm that allows the optimization of communication network architectures across the traditional layer boundaries, but does not imply a change of the present layered architecture. Cross-Layer optimization is used in multi media application this is also used in run this type of applications parallel so that network resources are shared. Cross-layer optimization usually improves network capacity and increases the number of users being served. Next-generation wireless networks that are 4G will have to support complex and resource-demanding applications, such as videoconferencing, 3D navigation and interactive gaming. Network operators will face the challenge of allocating the wireless medium efficiently to increase network capacity and provide services at the highest quality level to the largest possible number of users.
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