QUALCOMM today announced it has successfully demonstrated the full mobility of high-quality, high-capacity voice over Internet protocol (VoIP) calls across multiple test environments, including mobile, pedestrian and fixed, enabling operators to migrate voice services to Internet protocol (IP)-based platforms for a common service platform.

The field tests, which involved 62 simultaneous calls, were conducted over CDMA2000 1xEV-DO Rev. A in one sector within a single 1.25 MHz channel - in a fully mobile configuration. The test network demonstrated capacity gains approximately 30 times greater than mobile analog voice and results from a fully loaded commercial network could be somewhat lower. QUALCOMM used commercial-ready application specific integrated circuits in both handset and prototype networks.

VoIP over EV-DO Rev. A leverages session initiation protocol, commonly referred to as SIP, in combination with a number of advanced techniques to achieve quality of service comparable to traditional landline voice. These techniques include:

• Comprehensive Quality of Service features, which enable operators to provide multiple services on a common packet data platform;
• Advanced call-hand-off algorithms, which ensure seamless operation in the mobile environment;
• Mobile receive diversity and equalization, which improve network capacity and user experience; and
• Enhanced speech-processing algorithms, which improve network capacity and ensure high voice quality.

Operators will be able to efficiently merge their wireless and wireline networks based on IMS, allowing them to realize unsurpassed cost and operational efficiencies over current deployments. By basing all communications services on an IP network, operators are able to use their network capacity in a much more flexible manner, through the dynamic allocation of capacity to an ever-increasing array of 3G services, such as:

• Push to talk, which is VoIP offered as walkie-talkie-like service;
• Packet-based video telephony, which combines realtime video with VoIP; and
• Simultaneous VoIP calls and data sessions.