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IMM REAFFIRMS ITS OFFER TO LICENSE ITS TDMA PATENTS TO CELLULAR EQUIPMENT MANUFACTURERS

 IMM REAFFIRMS ITS OFFER TO LICENSE ITS TDMA
 PATENTS TO CELLULAR EQUIPMENT MANUFACTURERS
 KING OF PRUSSIA, Pa., Jan. 10 /PRNewswire/ -- International Mobile Machines Corporation (NASDAQ: IMMC) announced today it has reaffirmed its offer to license its essential TDMA system patents to all cellular equipment manufacturers on a nondiscriminatory basis and on reasonable terms and conditions.
 In light of this week's unanimous vote by the Cellular Telecommunications Industry Association (CTIA) in favor of Time Division Multiple Access (TDMA), IMM announced its support for and full cooperation with the cellular industry's unanimous decision to implement the TDMA Air Interface Standard for digital cellular radio systems in North America.
 "The latest vote by the cellular industry now clears up any confusion about the status of the cellular standard," said William J. Hilsman, chairman and chief executive officer of IMM. "The TDMA standard -- known as IS-54 -- is the result of more than three years of work by all the suppliers of cellular equipment, including the major system suppliers such as AT&T, Motorola, Ericsson, Northern Telecom, and Hughes/General Motors, as well as the many manufacturers of terminal equipment. IMM has participated very actively in this process. The TDMA standard has been tested exhaustively at every stage, and has now completed the final, or "lockdown" testing, which clears the way for imminent commercialization of TDMA hardware. Obviously, this marks an important milestone as well for IMM, since our intellectual property will now assume an even greater importance."
 The decision by the CTIA to confirm the TDMA standard -- which echoes similar standards decisions in favor of TDMA in Europe and Japan -- came after considerable industry discussion of other alternatives, including wideband approaches such as Code Division Multiple Access as well as narrowband systems like Motorola's N-AMPS. "In any high- technology field, there will always be discussion and debate over alternatives," said Dr. George Calhoun, IMM's senior vice president of planning and author of the book "Digital Cellular Radio." "However, the unanimous TDMA decision reflects the growing consensus regarding two key points. First, that digital TDMA architectures -- including lightweight portable TDMA terminals -- can be fielded now, in 1992, which obviates the need for another round of analog hardware like N-AMPS. Second, it is now clear that other approaches like CDMA will require several years to prove out. And the industry knows it does not have to wait." The CTIA announcement this week indicated its unanimous view that wideband systems would not be ready for two years at the earliest, and suggested a need for extensive further study before any further steps could be taken along those lines.
 IMM has been a pioneer in the development of TDMA digital radio systems since the early 1980s, and was the first company in the world to commercialize spectrum-efficient TDMA systems for use by telecommunications service providers, beginning in 1986. "In fact, our systems in the field today outperform the new cellular TDMA baseline standard," said Hilsman. "We have already shown that TDMA is both robust and flexible, and that it is capable of much higher capacity and performance. That is the basis of our partnership with Hughes/General Motors to develop Extended TDMA (E-TDMA) for digital cellular systems." The E-TDMA program was announced in December 1990 by a consortium involving IMM, Hughes, and SEL Alcatel. The technical objectives of the E-TDMA architecture include full 100 percent compatibility with the IS-54 TDMA standard, with software-based enhancements capable of more than doubling the baseline capacity to approximately 15 times the capacity of today's analog cellular systems.
 /delval/
 -0- 1/10/92
 /CONTACT: Marcia A. Bexley of IMM, 215-278-7831/
 (IMMC) CO: International Mobile Machines Corporation ST: Pennsylvania IN: TLS SU:


MK-CC -- PH015 -- 8654 01/10/92 13:09 EST
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Publication:PR Newswire
Date:Jan 10, 1992
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