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TDMA DIGITAL CELLULAR TRIALS CONTINUE

 KING OF PRUSSIA, Pa., March 19 /PRNewswire/ -- InterDigital Communications Corporation (AMEX: IDC) said today that it is pleased to see the continued successful deployment of Time Division Multiple Access (TDMA) digital cellular equipment.
 With the announcement of trial systems by McCaw Cellular, BellSouth Enterprises, and most recently, Southwestern Bell Cellular One(R), TDMA systems are now being installed and are under trial in several major U.S. cities. InterDigital's TDMA technology is the basis of the digital cellular industry transmission standard, IS-54.
 McCaw Cellular, a longtime proponent of TDMA technology, has said it has tested and is now ready to commercially offer the first all-digital TDMA cellular system in South Florida.
 BellSouth Enterprises' field trials began in November 1992 in Mobile, Ala., using Hughes Network Systems' Enhanced-TDMA (E-TDMA) digital cellular equipment. During the trial, more than 10 calls per channel were successfully transmitted during peak load conditions.
 Southwestern Bell's Cellular One announced yesterday that it is launching a 4,000-customer trial in Chicago, the site of the first introduction of cellular phone service. Cellular One customers will use Motorola, Hughes Network Systems or Ericsson cellular car phones.
 Hughes Network Systems is a licensee of InterDigital's patented TDMA technology. InterDigital Patents Corporation is in negotiations with several of the major cellular manufacturers for additional licensing agreements.
 These successful trials support the March 12, 1993, Donaldson, Lufkin & Jenrette report, which said, "The battle between proponents of TDMA and CDMA (Code Division Multiple Access) continues, but for the time being TDMA has won, because it's ready for commercial introduction; CDMA isn't and probably won't be for another two years. Standards may be set within the year, but testing, production, and commercial introduction of handsets -- especially of portables -- is not likely to happen much before 1995. Whether CDMA is better than TDMA has yet to be established. Even if it is as good, the question may be academic, much like the VHS-Beta battle in video, because millions of TDMA handsets will likely already be in the market by the time CDMA gets established."
 /delval/
 -0- 3/19/93
 /CONTACT: Marcia A. Bexley, 215-278-7831, or Dave Buckingham (financial), 215-278-7910, both of InterDigital Communications/
 (IDC)


CO: InterDigital Communications Corporation ST: Pennsylvania IN: TLS SU:

MJ-CC -- PH024 -- 7915 03/19/93 12:42 EST
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Publication:PR Newswire
Date:Mar 19, 1993
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