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

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Superframe Extension for 802.15.4] Date Submitted: [18 March 2008 ] Source: [Ghulam Bhatti] Company [MERL] [ Benjamin Rolfe] Company [Blind Creek Associates ]

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

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title:[Superframe Extension for 802.15.4] Date Submitted: [18 March 2008] Source: [Ghulam Bhatti] Company [MERL] [Benjamin Rolfe] Company [Blind Creek Associates] [Zafir Sahinoglu] Company [MERL] Address [] Voice:[], E-Mail: [gbhatti@merl.com, ben@blindcreek.com, zafer@merl.com] Re: [] Abstract: Overview of proposed Superframe extension for beacon enabled PAN to accommodate added GTS slots and providing a CAP following the GTS slots, with ability to support operation of legacy nodes in the same PAN. Purpose: Stimulate discussion in the task group 15.4e 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. Bhatti, Rolfe, Sahinoglu

  2. Application Needs • Lower, Deterministic Latency • 50 to 100ms maximum range • Enhance reliability in noisy environment • Better channel utilizations • Higher payload bursts Bhatti, Rolfe, Sahinoglu

  3. Superframe Extension Concept Beacon CAP CFP ECFP ECAP Inactive SFED Extended Superframe structure example Existing Superframe structure example Bhatti, Rolfe, Sahinoglu

  4. Why Extend the Superframe? • Provide CAP following GTS slots • CAP for retransmission of failed GTS frame to enhance reliability and reduce latency in noisy channel • Allow for more than 7 GTS slots for latency critical applications • Preserve Legacy Compatibility • Superframe structure preserved • Extension treated as inactive period by legacy device • CAP first advantage for really simple devices Bhatti, Rolfe, Sahinoglu

  5. Issues • PAN Forming and Maintaining • Beacon changes • Superframe spec • Reserved bit c/b used as extension indication • Add SF-E spec as IE-type structure in beacon payload (ignored by legacy devices) • GTS Allocation and Management • Simultaneous Piconets Bhatti, Rolfe, Sahinoglu

  6. GTS Management Overhead Concern • Issue: GTS contention overhead in CAP • Reference: 15-08-0120-00-004e (Betty Zhao, Yongjun Liu) • Similar for any/all management frames • Superframe Extension with modified ECAP • divided (normal and management parts) • Changes confined to extension so no impact to legacy devices Beacon CAP CFP ECFP ECAP MGT CAP Inactive SFED SFE with Management CAP Bhatti, Rolfe, Sahinoglu

  7. Thank You Bhatti, Rolfe, Sahinoglu

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