September 2003

John Santhoff, Pulse~LINKSlide 1

doc.: IEEE 802.19-03/029r3

Submission

Project: IEEE P802.19 Coexistence TAGProject: 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.

September 2003

John Santhoff, Pulse~LINKSlide 2

doc.: IEEE 802.19-03/029r3

Submission

A Common-Signaling-Protocol for Coexistence of Multiple UWB

Physical Layers

Allowing Many Flavors of UWB Signaling to Coexist

September 2003

John Santhoff, Pulse~LINKSlide 3

doc.: IEEE 802.19-03/029r3

Submission

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?

September 2003

John Santhoff, Pulse~LINKSlide 4

doc.: IEEE 802.19-03/029r3

Submission

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

September 2003

John Santhoff, Pulse~LINKSlide 5

doc.: IEEE 802.19-03/029r3

Submission

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]

September 2003

John Santhoff, Pulse~LINKSlide 6

doc.: IEEE 802.19-03/029r3

Submission

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

September 2003

John Santhoff, Pulse~LINKSlide 7

doc.: IEEE 802.19-03/029r3

Submission

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

September 2003

John Santhoff, Pulse~LINKSlide 8

doc.: IEEE 802.19-03/029r3

Submission

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

September 2003

John Santhoff, Pulse~LINKSlide 9

doc.: IEEE 802.19-03/029r3

Submission

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

September 2003

John Santhoff, Pulse~LINKSlide 10

doc.: IEEE 802.19-03/029r3

Submission

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– Collaborated techniques for managing packet transmission based on

channel monitoring

• Non-Collaborative:– Adaptive packet (time/frequency) selection and scheduling

September 2003

John Santhoff, Pulse~LINKSlide 11

doc.: IEEE 802.19-03/029r3

Submission

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

September 2003

John Santhoff, Pulse~LINKSlide 12

doc.: IEEE 802.19-03/029r3

Submission

Transmit Order

T1

0 1 2 .......

T2-T9

n

T10

Preamble Field Purpose

T1-T2 AGC, and Signal Detection

T3 Antenna Diversity Selection

T4-T6 Frequency Acquisition

T7-T9 Channel Estimation

T10 PHY Type

Conceptual Model

September 2003

John Santhoff, Pulse~LINKSlide 13

doc.: IEEE 802.19-03/029r3

Submission

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

September 2003

John Santhoff, Pulse~LINKSlide 14

doc.: IEEE 802.19-03/029r3

Submission

Next Steps?

Questions?

Comments?

Suggestions?