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Fourth Generation (4G) wireless systems targeting 100 Mb/s for highly mobile scenarios and 1 Gb/s for low mobility communication are soon to be deployed on a broad basis with LTE-Advanced and IEEE 802.16m as the two candidate systems. Traditional applications spanning everything from voice, video, and data to new Machine-To-Machine (M2M) applications with billions of connected devices transmitting sensor data will in a soon future use these networks. Still, interworking solutions integrating those new 4G networks with existing legacy wireless networks are important building blocks in order to achieve cost-efficient solutions, offer smooth migration paths from legacy systems, and to provide means for load balancing among different radio access technologies.
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