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UMA is a technology helping cellular operators to retain control over subscribers in the era of converging radio access technologies. By supporting handovers to and from Wi-Fi networks. This research paper discusses the technical implications of UMA based on measurement results for GSM to Wi-Fi handovers. The measurements show that UMA works well, and voice handover breaks are similar or lower than those experienced in traditional GSM systems. In addition, UMA provides a considerably higher throughput than GSM systems. The challenges are introduction to Unlicensed Mobile Access (UMA) Evolution of telecom network from early analogue networks to digital circuit switched network has already taken place.
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