To: D.J.Smyth who wrote (24222 ) 3/15/1999 2:35:00 PM From: Ruffian Respond to of 152472
ITU> From the March 15, 1999 issue of Wireless Week ITU Spotlights Spectrum Needs By Peggy Albright While the 3G spotlight this month is on International Telecommunication Union members meeting in Fortaleza, Brazil, to characterize the IMT-2000 radio air interfaces, another group of key U.S. and international technology experts gathered there to finalize the technology's spectrum requirements. At press time, the latter group was scheduled to achieve international consensus on spectrum needed for both terrestrial and satellite components of IMT-2000 for the year 2010. The outcome of their efforts will become the foundation for work leading up to the World Radio Conference 2000, which is expected to allocate the needed spectrum. The World [Administrative] Radio Conference in 1992 identified 230 megahertz for both the terrestrial and satellite needs of IMT-2000. The ITU subsequently determined that the 230-megahertz allocation would not be adequate given the increasing and forecasted needs to provide wideband data and multimedia services worldwide. For the past 18 months, the ITU has been recalculating spectrum needs, considering deployment scenarios for three regions: the Americas, Asia and Europe. "Right now, the U.S. has a value of 390 megahertz for terrestrial [services]. Europe is probably over 500 megahertz. I don't know where the Asian final numbers are going to come in," said Stephen Blust, senior manager of strategic technology at BellSouth Cellular and the international chair of the group charged with defining IMT-2000 spectrum requirements. "My goal as chair of this effort is to progress toward a common global number." All countries used a set of ITU-approved parameters for calculating IMT-2000 terrestrial spectrum requirements, but some regional characteristics--such as differences in how closely some countries configure their cell sites--influence spectrum needs, he said. If the delegates do not overcome their regional differences, Blust proposed, as a "last resort," building regional considerations into the final spectrum report. The approach would allow two values: one for the common global spectrum needed across all regions and another for additional spectrum specific to a particular region. The methods ITU members followed to calculate spectrum requirements for both satellite and terrestrial systems used agreed-upon values for a host of parameters. For the terrestrial component, these parameters include projected population density, cell area, market penetration rate and net system capability, among many other factors such as the estimated number of networks and operators. These estimates, which paint a detailed picture of how and where experts see mobile services being used, are available to companies for use in business planning purposes, Blust said. The U.S. calculation of 390 megahertz for global terrestrial spectrum needs allocates 172 megahertz for current speech, simple messaging and switched data services and another 218 megahertz for third-generation services, which would include mobile Internet, multimedia and highly interactive multimedia services, such as videoconferencing. The satellite component considers four types of services--voice, messaging and low speed data, asymmetric multimedia and interactive multimedia. Global usage estimates were calculated by the United States and by the International Mobile Satellite Organization for the years 2005 and 2010. The satellite spectrum requirements proposed by the U.S. report total 2 by 145 megahertz for global mobile satellite services in 2010, of which 2 by 67 megahertz would be designated for IMT-2000 services. Taking the outcome of Blust's meetings from last week, another group gathered in Fortaleza. The group, led by Christine DiLapi, senior staff engineer in the government relations office at Motorola Inc., is meeting to finalize input on IMT-2000 spectrum documents for eventual discussion of these topics at WRC-2000. That work will be completed this week. Determining how to provide the needed spectrum will be one of the key issues at WRC, DiLapi said, given that the frequency bands suitable for mobile applications below 3 GHz already are heavily used.