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In an Aggregated Radio Access Network (A-RAN), wherein multiple Radio Access Technologies (RAT) coexist, different radio resource utilization in each RAT may result in decreasing Quality of Service (QoS). In this paper, the authors propose a radio resource switching scheme in A-RAN coexist to provide multi-modal mobile users with the best service using a cloud base-station concept. The proposed scheme is manipulated to optimize radio utilization and QoS. The widespread and increasing use of smart-phones and broadband based services such as high-quality video and peer-to-peer services has caused the explosion of data traffic in mobile networks. To cope with this surge of data traffic, new technologies such as the WiMAX and LTE families have been implemented in a short period.
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