Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Compromise Ad Hoc Meeting Report] Date Submitted: [February 25, 2004] Source: [John Santhoff] Company [Pulse~LINK] Address [1969 Kellogg Ave, San Diego, CA 92008]] Voice:[760-607-0844], FAX: [760-607-0861], E-Mail:[jsanthoff@pulselink.net] Re: [Documents 04/051r2 and 04/067r1: Compromise Ad Hoc Meeting authorization and agenda] Abstract: [This document provides a report to Task Group 3a from the chair of the compromise ad hoc meeting regarding the work of the meeting group.] Purpose: [To provide information to TG3a regarding compromise discussions and specific details of the proposed common signaling mode (CSM).] Notice: This document has been prepared to assist the IEEE P802.15. 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 P802.15. John Santhoff, Pulse~LINK

2. Background • Moved & Approved: “That TG3a create an Ad Hoc group to consider possible compromises, if any. The resulting report will be presented at the March 2004 meeting.” • Action: Meetings were held February 23-25 2004. Minutes available in document: 15-04-0086-00-003a • This document is the Ad Hoc Chair’s report of the meeting. John Santhoff, Pulse~LINK

3. Common Signaling Mode (CSM) Executive Summary • Very Simple CSM Solutions Identified • ~5 dB link margin improvement • Bandwidth is dropped by 1/3 and data-rate is dropped by 1/10Result is 5 dB better link margin than base 110Mbps MB-OFDM rate • Important Problem • More than one UWB solution will exist in the marketplace • CSM proactively manages co-existence • Enables interoperability and controls interference • Provides flexibility/extensibility within IEEE standards • Manages Risks • Improves the case for international regulatory approval • Provides options for future growth & scalability • Provides options to meet diverse application needs John Santhoff, Pulse~LINK

4. Outline • Documents presented & discussion topics • Interoperability objectives and requirements • MAC considerations • PHY considerations • Summary John Santhoff, Pulse~LINK

5. Documents presented • 04/078r1 “Requirements supporting a common base mode” John Barr • 04/079r2 “Requirements for a UWB Common Signaling Protocol” Yasaman Bahreini • 04/080r1 “Compromise for UWB Interoperability – MAC Overview” Matt Wellborn • 04/081r2 “Compromise for UWB Interoperability – PHY Overview” John McCorkle • 04/082r0 “Options for a Common Signalling Protocol” Michael McLaughlin John Santhoff, Pulse~LINK

6. Different Compromise Discussions • Common mode for multiple PHYs • BPSK in MB-OFDM Band 2 • Common mode using existing MB-OFDM preamble, or minimal changes • Common mode that supports a low-rate non-TG3a device (UWB or non-UWB) John Santhoff, Pulse~LINK

7. A CSM Compromise Solution Proposed Common Signaling Mode Band (500 MHz bandwidth) DS-UWB Low Band Pulse Shape (RRC) 3960 Frequency (MHz) 3100 5100 MB-OFDM (3-band) Theoretical Spectrum John Santhoff, Pulse~LINK

8. Range of Application Requirements • TG3a has uncovered a huge range of requirements and usage scenarios: • Very high rate, isochronous transport of multimedia content (HDTV, Home Theater) between powered and portable devices. • Transfer of large amounts of data (video, image, MP3) between portable devices and PCs/media servers. • Transfer of individual items between like devices (e.g., exchange images between group capture camera and those cameras carried by the group in the image) • Interaction of portable devices sharing a local experience (multi-player gaming) • The CSM provides a framework to facilitate future growth and innovation: • High data rate short range transfers vs wireless home theater connectivity • A PHY selection that leaves openings for more efficient PHY choices will always be under attack by more appropriate PHYs John Santhoff, Pulse~LINK

9. Long Term Vision • 802.15.3a defines UWB solutions useful in a large number and variety of devices • As technology improves, any 802.15.3a device can coexist and interoperate with all current (legacy) and future UWB devices • An ecosystem for WPAN technology evolves because of the ubiquity of the 802.15.3a standard in devices (e.g. WiFi) • 802.15.3a common base mode more easily enables world wide regulatory approval, where CSM manages one or more optional modes approved for use in each regulatory region John Santhoff, Pulse~LINK

10. Objectives / Requirements / Goals • A Mode where different classes of UWB device (PHYs) operating in common spectrum can proactively co-exist & interoperate • TG3a compromise • MB-OFDM  DS-UWB • PNC does not limit peer-to-peer operations within CTAs • Extensibility to other UWB PHY’s • TG3a  non-TG3a • Simple • Negligible cost in terms of die-size and power consumption • Enable lower cost/power implementations without limiting the performance of higher-end implementations • Negligible impact on current proposals • Minimum changes to DS-UWB and MB-OFDM approaches • Mode is likely to fit into worldwide regulations John Santhoff, Pulse~LINK

11. Current MAC Capabilities • 15.3 TDMA behavior allows different classes of UWB devices to interoperate • Once a device is assigned a timeslot, that slot can be used for any transmission (e.g. MB-OFDM or DS-UWB or future UWB PHY) the device chooses • The basic mechanism needed to make this work is a “common language” or common signaling mode (CSM) that allows devices to communicate at a basic level that allows time slot request and allocations John Santhoff, Pulse~LINK

12. 15.3 MAC Support for a Compromise • Beacon formats • Default use of CSM for beacons in mixed piconet • Homogenous piconets can use higher rate beacons • Periodic use of CSM beacon to permit new devices to join • Contention mechanisms for mixed piconets • CSMA/CA, slotted aloha, RTS-CTS with CSMA • DEV capabilities • Add fields to identify DEV support for alternate waveforms • Minimum requirements for non-TG3a devices • Participation as DEV • Participation as PNC John Santhoff, Pulse~LINK

13. Overview of a CSM PHY • It is inevitable that multiple UWB solutions will exist in the marketplace • CSM manages multiple UWB solutions • Advantages • Interoperability – minimizes market confusion caused by dissimilar UWB devices • Coordinated co-existence provides higher system throughput & better QoS than non-coordinated systems in mixed-device environments • CSM provides a very low power mode for power sensitive devices • Future proofing • Multiple PHYs provide more options for diverse applications • Potential support for future UWB solutions • Mitigates regulatory uncertainties • Disadvantages • Slight additional complexity John Santhoff, Pulse~LINK

14. The CSM is Consistent with goals of other UWB trade organizations • MBOA Mission: “To develop the best overall solution for ultra-wideband based products in compliance with worldwide regulatory requirements, to ensure peaceful coexistence with current and future spectrum users, and to provide the most benefits to the broadest number of end consumers.” Ref: (online): http://www.multibandofdm.org, 25 Feb 2004. John Santhoff, Pulse~LINK

15. Summary • Very Simple CSM Solutions Identified • ~5 dB link margin improvement • Bandwidth is dropped by 1/3 and data-rate is dropped by 1/10Result is 5 dB better link margin than base 110Mbps MB-OFDM rate • Important Problem • Inevitable that more than one UWB solution will exist in the marketplace • CSM manages this fact • Enables interoperability and controls interference • Provides flexibility/extensibility within IEEE standards • Manages Risks • Improves the case for international regulatory approval • Provides options for future improvements • Provides options to meet diverse application needs John Santhoff, Pulse~LINK