Cellular TDD in TIA Eric Jacks LinkAir Communications TIA TR45 Meeting Ft. Lauderdale, FL March 5, 2003 Notices: The contributor grants a free, irrevocable license to the Telecommunications Industry Association (TIA) to incorporate text or other copyrightable material contained in this contribution and any modifications thereof in the creation of a TIA Publication; to copyright and sell in TIA's name any TIA Publication even though it may include all or portions of this contribution; and at TIA's sole discretion to permit others to reproduce in whole or in part such contribution or the resulting TIA Publication. This contributor will also be willing to grant licenses under such copyrights to third parties on reasonable, non-discriminatory terms and conditions for purpose of practicing a TIA Publication which incorporates this contribution. This document has been prepared by Lucent Technologies to assist the TIA Engineering Committee. It is proposed to the Committee as a basis for discussion and is not to be construed as a binding proposal on Lucent Technologies. Lucent Technologies specifically reserves the right to amend or modify the material contained herein and nothing herein shall be construed as conferring or offering licenses or rights with respect to any intellectual property of Lucent Technologies other than provided in the copyright statement above.

LinkAir: Background Innovators of TD-LAS: An enhanced performance Code Division Duplex (CDD) version of Time Division Duplex (TDD). Innovators of TD-LAS: An enhanced performance Code Division Duplex (CDD) version of Time Division Duplex (TDD). Member of the TDD Coalition. Member of the TDD Coalition. –TDD Coalition’s main purpose is the advance the progress of TDD technologies internationally. –Coalition contains 12 member companies, of which 6 are TIA members. –Currently, LinkAir Vice-chair of TDD Coalition (On-going) LinkAir proposing TDD for inclusion within 3GPP2: (On-going) LinkAir proposing TDD for inclusion within 3GPP2: –July/2002 Vision JEM: “S00VISION LINKAIR - TDD System in 3G and B3G” –Oct/2002 Steering Committee: “SC B-R1 LinkAir - New TDD TSG“

LinkAir: Purpose Introduce Cellular TDD-based technologies as part of the TIA TR45 standardization program. Introduce Cellular TDD-based technologies as part of the TIA TR45 standardization program. –TDD has significant benefits over FDD for high-speed data transmission –Popularity of WLAN (for fixed “hotspots”) is only the beginning.

Why TDD? TDD Spectrum Available TDD Spectrum Available US: FCC Activities US: FCC Activities ITU Activities ITU Activities Other Groups Promoting TDD Other Groups Promoting TDD

TDD Spectrum Availability TDD-capable spectrum is available in: TDD-capable spectrum is available in: –China: (155 MHz of spectrum allocated for TDD implementations. Band-plan: MHz, MHz, MHz –China: (155 MHz of spectrum allocated for TDD implementations. Band-plan: MHz, MHz, MHz) –Japan: (IMT-2000 Band-plan: Mhz) –US: Unpaired Mhz band (Auction April/2003)Unpaired Mhz band (Auction April/2003) Unpaired Mhz band (Auction: TBA)Unpaired Mhz band (Auction: TBA) Mhz band (as part of the FCC Spectrum Task Forces reallocation of this spectrum) Mhz band (as part of the FCC Spectrum Task Forces reallocation of this spectrum) –Europe: (IMT-2000 Band-plan: Mhz & Mhz)

US: FCC Activities FCC Auction 46:Unpaired Mhz band to be auctioned April 30, FCC Auction 46:Unpaired Mhz band to be auctioned April 30, –Also, December 21, Report & Order and Memorandum Opinion & Order (FCC ) calls for the reallocation of the MHz as unpaired spectrum. FCC FCC Wireless Communication Association Int’l (WCAI) - Oct. 7, 2002):Presented the FCC with a detailed proposal designed to assist in the Commission’s efforts toward amending its regulatory rules for the Mhz band Wireless Communication Association Int’l (WCAI) - Oct. 7, 2002):Presented the FCC with a detailed proposal designed to assist in the Commission’s efforts toward amending its regulatory rules for the Mhz band –Provides a band-plan that provides commercial and educational system operators with either FDD or TDD services. (Most current licensees will have 16.5 MHz for TDD operations.)

Current ITU Activities ITU-R WP8F: (September 25 - October 2, 2002 meeting in Geneva, Switzerland) ITU-R WP8F: (September 25 - October 2, 2002 meeting in Geneva, Switzerland) –Spectrum Working Group developed a Preliminary Draft New Report (PDNR) on: "Mitigating Techniques to Address Coexistence Between IMT TDD and FDD Radio Interface Technologies within the Frequency Range MHz operating in Adjacent Bands and in the Same Geographical Area.“"Mitigating Techniques to Address Coexistence Between IMT TDD and FDD Radio Interface Technologies within the Frequency Range MHz operating in Adjacent Bands and in the Same Geographical Area.“ –Report addresses potential improvements brought about when mitigation techniques are applied to the results of existing ITU TDD-FDD coexistence studies.

Other Groups Promoting TDD 3GPP TSG-RAN WG1: Currently evaluating the performance impact of including an OFDM channel with the existing UMTS HSDPA design. Also, on- going efforts with UTRA-TDD and TD-SCDMA. 3GPP TSG-RAN WG1: Currently evaluating the performance impact of including an OFDM channel with the existing UMTS HSDPA design. Also, on- going efforts with UTRA-TDD and TD-SCDMA. –Note: OFDM = TDD-based system IEEE Mobile Broadband Wireless Access (MBWA):Formed study group to establish requirements for an MBWA system IEEE Mobile Broadband Wireless Access (MBWA):Formed study group to establish requirements for an MBWA system –These requirements permit TDD capabilities, while operating in 2- 11GHz band. Low and high mobility cases being reviewed. TDD Coalition: Mission -- To promote TDD technologies and services, benefits, and requirements and considerations for implementing TDD. TDD Coalition: Mission -- To promote TDD technologies and services, benefits, and requirements and considerations for implementing TDD. –Active in: ITU-R WP8F, 3GPP, IEEE MBWA, TD-SCDMA Forum, DECT Forum, and 3GPP2. Includes direct correspondence and TDD tutorials with the FCC.

What does all this mean? TDD is here to stay: TDD is here to stay: – ITU, 3GPP, and IEEE :Already evaluating and standardizing TDD-based technologies to take advantage of licensed TDD spectrum. TDD has significant benefits for cellular networks:TDD has significant benefits for cellular networks: –Additional spectral efficiency, especially for Internet and data traffic –Simpler designs –Cheaper spectrum in Asia and Europe, potentially the US –High potential for Next Generation (e.g. 3G and B3G)

LinkAir Request to TR45 Request that a TR45 adhoc group be formed to consider the following issues: Request that a TR45 adhoc group be formed to consider the following issues: –Interest of TR45 participant companies in Cellular TDD technology standardization. –TR45 standardization process for cellular TDD technologies.

Conclusion TR45 feedback to be forwarded to the TDD Coalition in preparation for a Coalition contribution to be submitted at the June/2003 TR45 meeting in Atlanta, GA. TR45 feedback to be forwarded to the TDD Coalition in preparation for a Coalition contribution to be submitted at the June/2003 TR45 meeting in Atlanta, GA. LinkAir thanks the TR45 members for their time in considering cellular TDD technologies. LinkAir thanks the TR45 members for their time in considering cellular TDD technologies.