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Quantitative Analysis of Static GTS Slots in IEEE802.15.3 MAC

This proposal presents quantitative data supporting the need for static GTS slots in the IEEE802.15.3 MAC, providing an improvement to the current version of the 802.15.2 MAC.

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Quantitative Analysis of Static GTS Slots in IEEE802.15.3 MAC

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: IEEE802.15.3: 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: XtremeSpectrum 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: [01350r1P802-15_TG3-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 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. <William Shvodian>, <XtremeSpectrum>

  2. 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. <William Shvodian>, <XtremeSpectrum>

  3. 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) <William Shvodian>, <XtremeSpectrum>

  4. 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 <William Shvodian>, <XtremeSpectrum>

  5. Beacon Error rate assumptions • 33ms superframe • 12 byte header • 76 byte frame body • 6 byte address • 12 byte synchronization parameters element • 4 byte • 50 bytes of CTA (8 CTAs) • 4 byte FCS <William Shvodian>, <XtremeSpectrum>

  6. Allowing transmission when header is correct but beacon payload is corrupt improves performance by 10X <William Shvodian>, <XtremeSpectrum>

  7. 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. <William Shvodian>, <XtremeSpectrum>

  8. 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 low power devices to participate in a WPAN without processing the CTAs in every beacon • Static GTS slots are needed for Daughter Networks <William Shvodian>, <XtremeSpectrum>

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