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To: stealthy who wrote (9427)	3/26/1998 6:09:00 PM
From: stealthy	Read Replies (1) \| Respond to of 152472

All: W CDMA : From Total Telecom; Mobile Week dated 3/24/98 ----------------------- Japan Throws Open The Doors On W-CDMA By Jeremy Scott-Joynt NTT DoCoMo is planning public tests - public, at least, as far as the industry is concerned - of the wideband CDMA system it and its partners are designing to be the air interface for third-generation mobile systems. Ericsson, also a pioneer in wideband CDMA and, with Nokia, Motorola and Lucent, DoCoMo's main partners, is providing a base station and a switch simulator for the trials. DoCoMo will use its own terminals. The idea, according to Ericsson, is for the system to act as a testbed at DoCoMo's Yokosuka Research Park in Tokyo to allow the companies to draw up a final specification for W-CDMA. W-CDMA was selected as the heart of the 3G air interface for Europe at the end of January, and will be combined with a time division duplex system optimized for carrying asymmetric, rather than symmetric, data flows. Operators and vendors across Asia are backing DoCoMo, which for reasons of global roaming is backing the combination solution Europe has decided upon, along with the deployment of a GSM-based network to form the system's backbone. In the US, though, interest outside the small GSM community of 1.5 million subscribers is still limited, and both European and Japanese vendors are keen to change that. "That's why DoCoMo have decided to have these trial sessions open to everyone and anyone," an Ericsson spokesman said. The testbed system will not necessarily have the full functionality that is planned for the final version, due for commercial introduction in Japan by April 2001. Its maximum data throughput will probably only be 384kbps, rather than the 2Mbps called for by both the International Telecom Union - which wants proposals for its IMT-2000 framework for a global 3G system by July - and European standards body ETSI. This should not be a problem from the point of view of proving the mobility aspects of the system, however. The 2Mbps throughput is intended only to be reached when the terminal is stationary; 384kbps is the rated performance for low mobility, whereas high-speed movement calls for a minimum of 144kbps.