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HUGHES NETWORK SYSTEMS ACHIEVES OVER 10 CALLS PER RADIO CHANNEL USING E-TDMA IN LIVE FIELD TRIALS

 GERMANTOWN, Md., March 15 /PRNewswire/ -- Hughes Network Systems today presented a report on its field trials, which over the past four months have deployed a very high-capacity digital cellular service. To date, the trials have assessed both the capacity and compatibility of Extended TDMA (E-TDMA) digital cellular telephone service. E-TDMA is a proposed extension of the current industry digital cellular standard (IS-54) to significantly increase network capacity using the same transmission standard specified in IS-54. Through highly efficient use of the radio spectrum, E-TDMA has achieved greater than 10 simultaneous calls per radio channel.
 In field trials begun in November 1992 at BellSouth Cellular facilities in Mobile, Ala., engineers from three companies (HNS, Alcatel and BellSouth) conducted a number of tests to verify the quality, capacity and coexistence of E-TDMA with the current operational AMPS network. For the test, Hughes supplied the GMH 2000 system, equipped with its state-of-the-art tri-mode, software configurable, cell-site radios capable of supporting analog, IS-54 TDMA and E-TDMA modes. The GMH 2000 network includes the Alcatel 1000 S12 end-office digital switch, providing a stable technology platform for the advanced cellular networks of the future.
 The testing compared the voice quality of cellular telephone calls in analog, standard TDMA and E-TDMA modes. Call handoffs were clearly demonstrated between the three modes via the "tri-mode" GMH 2000 network. TDMA and E-TDMA calls were demonstrated to be fully compatible and thus supportable on the same digital RF channel set, providing a flexible means of transitioning from IS-54 TDMA to E-TDMA.
 Hughes and Alcatel engineers then worked side-by-side to validate the calling capacity of the system. E-TDMA uses speech interpolation, a technique that packetizes speech and assigns users and RF channel only when information (i.e. voice or data) is ready to be transmitted. This factor allows many users to share a single channel simultaneously. In the capacity test, Hughes deployed more than 90 digital cellular E-TDMA subscriber units (modified M6100 commercial dual-mode IS-54 mobile telephones) on 8 RF channels, resulting in over 11 calls per channel.
 Although the initial goal was only to achieve 10 calls per channel, E-TDMA's "soft" capacity limit allows it to support even higher capacity under peak load conditions. The monitored speech quality was consistent, with little or no degradation as the network load was increased beyond 10 calls per channel.
 Said HNS Executive President Pradeep Kaul: "We are elated by the initial results of our field trials in Mobile. It appears that our goals of E-TDMA capacity of 10 calls per channel were not only met, but exceeded. HNS is currently in the process of deploying E-TDMA networks overseas that support both fixed and mobile configurations. In these applications, the high capacity and low cost requirements for fixed telephony services are uniquely supported by the GMH 2000's advanced digital radios."
 Kaul added that Hughes would continue to work with the TIA, CTIA, and entire cellular industry on development of an E-TDMA digital cellular standard for North America. To accelerate E-TDMA's adoption, Hughes and Alcatel will be opening the field trials to cellular operators and vendor participation following the CTIA's Wireless `93.
 "E-TDMA is a logical extension of the current IS-54 standard, already in its second revision, and will provide a non-disruptive, compatible technique for increasing IS-54's capacity, in order to fuel the next generation of cellular and personal communications services," Kaul said.
 Hughes Network Systems is a world leader in advanced digital communications. In addition to wireless telephony and cellular networks, HNS is the premier provider of interactive satellite networking equipment. The company also provides high-speed data transfer technology. Headquartered near Washington, HNS is a subsidiary of Hughes Aircraft Company, a unit of GM Hughes Electronics.
 -0- 3/15/93
 /NOTE: GMH 2000 is a trademark./
 /CONTACT: Judy Blake, 301-428-7113, or Alison Welles Snowden, 301-428-7111, fax 301-428-2818, both of Hughes Network Systems/


CO: Hughes Network Systems ST: Maryland IN: CPR TLS SU:

DC -- DC025 -- 6159 03/15/93 15:37 EST
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Date:Mar 15, 1993
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