September 2001 doc IEEE 802 15 01436 r

<September 2001> doc. : IEEE 802. 15 -01/436 r 0 Project: IEEE P 802. 15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: IEEE 802. 15. 3: Quantitative analysis of the need for static GTS slots in the 802. 15. 3 MAC. Date Submitted: 17 September, 2001 Source: Dr. William Shvodian Company: Xtreme. Spectrum Address: 8133 Leesburg Pike, Suite 700, Vienna, Virginia 22182 Voice: +1. 703. 269 -3047, FAX: +1. 703. 269. 3092, E-Mail: bshvodian@xtremespectrum. com Re: [01350 r 1 P 802 -15_TG 3 -MAC-Static-&-Unassigned-GTS. ppt ] Abstract: This proposal presents quantitative data to support the need for 802. 15. 3 MAC static GTS slots. Purpose: To provide an improvement to the current version of the 802. 15. 2 MAC Notice: This document has been prepared to assist the IEEE P 802. 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 P 802. 15. Submission 1 <William Shvodian>, <Xtreme. Spectrum>

<September 2001> doc. : IEEE 802. 15 -01/436 r 0 Overview • 01/350 shows how static and pseudo-static GTS slots can be added to the 802. 15. 3 MAC in a simple, robust and flexible manner. • This presentation provides additional quantitative proof of the need for static GTS slots. Submission 2 <William Shvodian>, <Xtreme. Spectrum>

<September 2001> doc. : IEEE 802. 15 -01/436 r 0 Quantification of the need for static GTS slots • In the current baseline, a device cannot transmit if it does not correctly receive a beacon. • The beacon error rate is a function of the header error rate and the payload error rate. • The following chart shows how often Beacon errors will occur given various bit error rates (assuming independent identically distributed (i. i. d. ) bit errors) Submission 3 <William Shvodian>, <Xtreme. Spectrum>

<September 2001> doc. : IEEE 802. 15 -01/436 r 0 • This chart clearly shows unacceptable rates of stream interruptions if a station is not allowed to transmit if a beacon is corrupted • 10 -5 BER results in 10 transmission denials per minute Submission 4 <William Shvodian>, <Xtreme. Spectrum>

<September 2001> doc. : IEEE 802. 15 -01/436 r 0 Beacon Error rate assumptions • 33 ms superframe • 12 byte header • 76 byte frame body – – – Submission 6 byte address 12 byte synchronization parameters element 4 byte 50 bytes of CTA (8 CTAs) 4 byte FCS 5 <William Shvodian>, <Xtreme. Spectrum>

<September 2001> doc. : IEEE 802. 15 -01/436 r 0 • Allowing transmission when header is correct but beacon payload is corrupt improves performance by 10 X Submission 6 <William Shvodian>, <Xtreme. Spectrum>

<September 2001> doc. : IEEE 802. 15 -01/436 r 0 • Allowing transmission with multiple missed beacons provides a dramatic increase in the average time between superframes that a source is not allowed to transmit due to corrupt beacons. Submission 7 <William Shvodian>, <Xtreme. Spectrum>

<September 2001> doc. : IEEE 802. 15 -01/436 r 0 Summary of the need for Static GTS slots • Static GTS slots allow stations to transmit in a superframe where either the Beacon header or entire Beacon were received in error. • Static GTS slots are needed to achieve an acceptably low probability of transmission denial due to corrupted beacons • Static GTS slot assignments allow power devices to participate in a WPAN without processing the CTAs in every beacon • Static GTS slots are needed for Daughter Networks Submission 8 <William Shvodian>, <Xtreme. Spectrum>