The field trial results prove that voice can be efficiently transported over an IP-based mobile network, including the cellular air-interface, to mobile terminals, with full quality of voice service as well as full quality of other service features such as data, without loss of capacity. The trial was made over Japan Telecom's WCDMA experimental system by running Ericsson's new robust header-compression algorithm, called Robust Checksum-based Header Compression (ROCCO), which is currently undergoing standardization within the Internet Engineering Task Force. The field trial was conducted in July and August with Japan Telecom at its network center in Chiba, Japan. Voice has special demands on quality, and until now the challenge has been to achieve high enough voice quality over a multiservice fixed IP network. "The trend in today's telecoms industry is towards 'all-IP' transport networks," says Håkan Eriksson, Vice President and General Manger, Ericsson Research. "Operators want to be able to use the same network for all services; data, voice and video. The field trial conducted together with Japan Telecom has proven that it is possible to transport voice over an IP-based mobile network, without compromising quality or systemperformance." "As the trend of wireless communications demands all service data to run on the same operating network, increasing efficiency of using WCDMA frequency is the main concern for securing service quality on an 'all-IP' network as well as promoting the quality in network operation," says Tetsuya Yuge, Vice President, Information and Communication Lab. of Japan Telecom. "I believe that the success in this trial gave us further breakthrough in the future mobile Internet that requires high quality and broadband all-IP needs."
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