Performance Evaluation of Unlicensed Mobile Access Using WiFi

Internet protocol (IP) telephony is sensible in the view of providing platform for faster information exchange using voice calls and its demand is increasing. IP telephony in heterogeneous network environments can prove its dominating characteristics over circuit switched network. General packet radio service (GPRS) is mostly used network in India. Interface, using serving GPRS support node (SGSN) gateway for IP telephony, to provide channel to all users using wireless local area network (WLAN) to make voice calls to GPRS mobile user, can provide ultimate solution for the need of cheaper and flexible calling in the areas where service provider´s coverage range is quite poor. Interconnecting WiFi and GPRS as mentioned in unlicensed mobile access (UMA) can provide more reliable and single device multi interface platform and add more flexibility to its users having handsets with dual radio interface capability. The performance evaluation has been done for UMA using network simulator. Analysis indicates that the system can perform better with less end to end delay, jitter, packet loss and optimum throughput.