InterDigital Outlines Product Architecure for Evolving Handsets to Support Wideband TDD

date: October 31, 2001

InterDigital Communications Corporation, a developer and enabler of advanced wireless technologies, described the product architecture for enabling WCDMA 3G handsets with Wideband Time Division Duplex (WTDD) technology.

In a presentation delivered at the Mobile Silicon Conference in Paris, France, Michael McEntee, Senior Product Manager for InterDigital, focused on the architecture and products that will enable handset manufacturers to evolve GSM/FDD handsets towards GSM/FDD/TDD handsets with reduced risks and cost.

"InterDigital's architecture allows WTDD to be added onto existing FDD/GSM handset designs," explained Mr. McEntee. "Our complete suite of products will allow equipment manufacturers to rapidly integrate WTDD into 3G handsets. Our hardware centric design approach provides for reduced power consumption, which, in turn, will greatly extend battery life in the handset. InterDigital is developing the technologies for WTDD baseband processing and RF circuitry required to support TDD bands and WTDD specific software protocol stacks."

The majority of 3G spectrum licenses awarded to operators worldwide have included a 5Mhz-unpaired band for WTDD operation. WTDD refers to the high chip rate standard (3.84 Maps) for TDD as specified by the UTRA TDD standard. WTDD, an integral component of the 3G UMTS standard, is ideally suited for high speed (up to 2Mbps) Internet access and file downloads in hot-spot and high traffic areas.

Carriers deploying WTDD in micro and pico cell environments as a complement to Frequency Division Duplex (FDD) can make efficient use of available bandwidth and meet the growing demands for data traffic as 3G networks are deployed. When coupled with FDD, WTDD technology delivers the complete 3G WCDMA solution.

"Operators deploying WTDD can efficiently provide peak data rates to their customers and thereby deliver a high quality of service. Many in the industry are projecting that, as new data applications and content are made available, asymmetric data traffic will increase substantially," Mr. McEntee noted. "In today's wire line environment, the data asymmetry is currently 8:1. Analysis conducted by InterDigital and other leading firms demonstrate that at this level, WTDD is 35% more spectrally efficient than FDD."

As the volume of data traffic over 3G networks increases, InterDigital sees applications for WTDD not only at capacity hot spots such as shopping malls and airports, but also for enterprise systems, such as intranets and extranets, and integrated services in Virtual Private Networks. InterDigital believes that the topography of most offices makes WTDD technology an ideal solution for enterprise applications.

InterDigital's complete WTDD solution consists of the baseband modem, a software protocol stack and an RF reference design. It will be particularly effective in delivering advanced voice and data capability to smart phones, wireless personal digital assistants, laptop computers, and other innovative wireless terminals.

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