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With rapid growth of mobile users and developments of mobile equipments like cell phones, laptops and Personal Digits Assistances (PDA), mobile networks have to meet dramatically increased service demands in the nearest future. The ever-increasing demands, such as the users expect to enjoy the service anywhere, anytime and the networks support a seamless mobility, driving the evolution of mobile networks at a fast pace. The next generation mobile network (LTE in 3GPP) is conducting research towards this goal. An IP protocol based flatter network architecture has been introduced in the Next Generation Mobile Networks (NGMN). In this network architecture, GateWay (GW) is the only node which establishes a connection between RAN and external world.
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