Common Signaling for UWB Coexistence

1. Project: IEEE P802.19 Coexistence TAG Submission Title: [Common Signaling for UWBCoexistence] Date Submitted:[17 September, 2003] Source: [John Santhoff] Company [Pulse~LINK] Address [9155 Brown Deer Rd. Suite 8, San Diego, CA 92121] Voice:[(858) 587-9001], FAX: [(858) 587-8799], E-Mail:[jsanthoff@pulselink.net] Re: [General contribution, tutorial to IEEE 802.19] Abstract: [At least one task group has chosen a UWB PHY, and a study group in P802.15 is considering UWB PHY that will operate in common spectrum. This presentation focuses on potential coexistence issues of multiple UWB PHY layers in a common frequency band.] Purpose: [Focus and attention need to be directed to P802.15, and soon P802.11, and discussions started on issues effecting coexistence of multiple UWB PHY layers using common spectrum. It is early enough in the standards draft process to consider preemptive measures to ensure coexistence.] Notice: This document has been prepared to assist the IEEE P802.19. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.19. John Santhoff, Pulse~LINK

2. A Common-Signaling-Protocol for Coexistence of Multiple UWB Physical Layers Allowing Many Flavors of UWB Signaling to Coexist John Santhoff, Pulse~LINK

3. Outline • Why address UWB Coexistence? • Where does UWB Coexistence stand today? • UWB PHY-to-PHY interference- When not If • How do we address UWB Coexistence? • Why a Common-Signaling-Protocol? • What is a Common-Signaling-Protocol ? • Design philosophy and goals of a CSP • Advantages of using a CSP for UWB • Why is it important to address these issues now? John Santhoff, Pulse~LINK

4. Why Should we Address UWB Co-Existence Now? • Lets face it: • The FCC R&O defines rules for granting access to 7,500 MHz of unlicensed spectrum for UWB • We will begin to see a massive proliferation of devices operating under these rules • Other regulatory bodies are not far behind • We all want to insure that UWB is deployed and a commercial success John Santhoff, Pulse~LINK

5. Where does UWB Coexistence stand today? • Currently: only one UWB standard in draft: P802.15.3a • In the works: • P802.15.4 SG4a might consider a UWB solution • P802.11 are looking for solutions which might involve UWB • Other Global standards groups are actively looking UWB standards • Today concern is UWB transmitter to Narrow-Band receiver. • Coexistence, however,is: “the ability of one system to perform a task in a given shared environment where other systems that may or may not be using the same set of rules”. [IEEE 802.15.2 definition of coexistence, http://grouper.ieee.org/groups/802/15/pub/2000/ Sep00/99134r2P802-15_TG2-CoexistenceInteroperabilityandOtherTerms.ppt] John Santhoff, Pulse~LINK

6. UWB PHY-to-PHY InterferenceIs a Matter of “When” not “If” • UWB “Beachfront” spectrum is 3.1-5.1 GHz. Every UWB PHY layer will want to use this portion of the allocated UWB spectrum • It is a virtual certainty that when multiple, dissimilar, uncoordinated, HDR, overlapping UWB Pico-nets co-exist that they will interfere John Santhoff, Pulse~LINK

7. How do we Solve the Problem? • We need an “Etiquette” to manage peaceful coexistence of different UWB PHY layers • The actions we take today will set the path for UWB evolution for potentially decades to come. • Lets not have market force rush us into compromises or positions we will regret later • A framework is needed that addresses guidelines on “what spectrum” is accessed “when” • A common signaling protocol can act as such an arbitrator John Santhoff, Pulse~LINK

8. What is a Common Signaling Protocol? • A “Lowest common denominator” UWB mode understandable to all UWB air interfaces • Methodology for allowing multiple different UWB PHY layers to co-exist in • the same spectrum bands • same coverage areas • Uses cooperative management of allocated PHY resources of time and frequency John Santhoff, Pulse~LINK

9. Why a Common Signaling Protocol? • We have a Once-in-a Lifetime opportunity to define an emerging wireless standard on a global scale • Let’s use this opportunity to address UWB interoperability and coexistence as a part of the standard instead of as an after thought • Example of the recent past: • the unlicensed ISM bands have experienced explosive growth with multiple PHY layer interfaces defined • In the ISM 2.4 GHz band, there are no less than five different PHY standards competing for coexistence in the same spectrum. (802.11b, 802.15.3, 802.15.4, Bluetooth and Cordless Phones) • UWB is gaining momentum: • It is likely that multiple UWB based PHY layers will emerge • Already in 802.15.3a; potential UWB in 802.15.4 SG4a; 802.11 John Santhoff, Pulse~LINK

10. Design Philosophy • A Common mechanism that is “pro-active” rather than “re-active” • Uses a pre-defined framework that facilitates allowing fair UWB PHY layer resources allocation • Collaborative: • Collaborated TDMA /FDMA techniques to allow for alternate transmissions among different UWB standards • Collaboratedtechniques for managing packet transmission based on channel monitoring • Non-Collaborative: • Adaptive packet (time/frequency) selection and scheduling John Santhoff, Pulse~LINK

11. Design Goals • Address coexistence - interoperability among differing UWB PHY’s • Low cost so implementation is not burden • Provide discovery beacon • Provide coarse SYNCH, diversity, frequency acquisition, AGC, channel estimation, protocol selection • Basis for a low rate – long range PHY • Enable geo-positioning • Mechanism for sleep mode • Procedure for wake up John Santhoff, Pulse~LINK

12. Preamble Field Purpose T1-T2 AGC, and Signal Detection T3 Antenna Diversity Selection T4-T6 Frequency Acquisition T7-T9 Channel Estimation T10 PHY Type T2-T9 T1 T10 .... . n 0 1 2 .. Transmit Order Conceptual Model John Santhoff, Pulse~LINK

13. Advantages of a Common-Signaling-Protocol for UWB • Guaranteed Coexistence with all compliant UWB PHY layers • Insures successful deployment of UWB technology on a global scale not just today but tomorrow • Potential low-level interoperability with other UWB PHY’s • Allows Low Data Rate (LDR) “sleep mode” for High Data Rate (HDR) devices John Santhoff, Pulse~LINK

14. Next Steps? Questions? Comments? Suggestions? John Santhoff, Pulse~LINK