ArrayComm and 11 other technology developers created TDD Coalitio...
ArrayComm and 11 other technology developers created TDD Coalition that’s urging FCC to make spectrum allocations for wireless broadband data systems using time division duplex (TDD). Companies requested regulators to make unpaired spectrum available for TDD-based services instead of…
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paired frequencies typically allocated for mobile wireless services. ArrayComm Senior Vp Bradley Holmes said TDD-based systems that offer wireless broadband services are expected to complement 3rd generation wireless services that use frequency division duplex technology that requires paired bands of spectrum. Other coalition members are Aperto Networks, BeamReach Networks, Caly Networks, Clearwire, Harris Corp., IPWireless, LinkAir, Malibu Networks, Radiant Networks, Raze Technologies, Wavion. Coalition said it wanted U.S. spectrum decisions to align with those of Europe and Japan, which already have made unpaired frequencies available for technologies such as TDD. Holmes said one concern of companies such as ArrayComm was that because other countries were beginning to make allocations dedicated to both TDD and FDD for advanced wireless services, if U.S. didn’t move in same direction, systems developed in U.S. would be deployed elsewhere first. ArrayComm’s technologies include i-Burst, portable broadband system that offers data rates of 1 Mbps, although company said technology could provide up to 40 Mbps per cell site. Holmes, treasurer of new coalition, told us that ArrayComm was conducting FCC-approved market trial in San Diego. Under experimental license granted by agency, ArrayCom can deploy i-Burst technology there until end of next year using 5 MHz of spectrum. As part of FCC proceeding that’s examining bands for potentially providing more spectrum for 3G, ArrayComm asked FCC to make allocations for not just FDD but for TDD as well. ArrayComm contended that technology could offer high-speed data in less spectrum than FDD-based technologies. “We're saying give us one block of 10 MHz,” Holmes said. Without channel plan that allowed single block optimized for TDD, technology developers said their concern was they would have to vie for 2 paired blocks in auctions against larger wireless carriers using FDD-based systems, even though TDD needed only one block. Holmes said ArrayComm could deploy technology in as little as 5 MHz, but ideally would prefer 10 MHz.