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CTA Advertisement for Overlapping Piconets: Addressing Wireless Network Interference

This submission discusses a method for non-PNC devices to announce CTA in uncoordinated piconets, aiming to mitigate interference in overlapping scenarios. It explores mechanisms to enhance device awareness of existing piconets for improved co-existence and synchronization.

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CTA Advertisement for Overlapping Piconets: Addressing Wireless Network Interference

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [CTA Advertisement for Overlapping Piconets] Date Submitted: [Mar. 2004] Source: [Song-Lin Young] Company [Sharp Labs. of America, Inc.] Address [5750 NW Pacific Rim Blvd, Camas, WA, 98607] Voice:[+1 360 817 7509], FAX: [+1 360 834 8696], E-Mail [syoung@sharplabs.com] Re: [15-04-0034-01-003b-SG3b-Closing-Report-Jan04.ppt] Abstract: [This document provides the method for announcement of CTA by non-PNC devices to uncoordinated piconet.] Purpose:[This contribution is a response to SG3b call for submission about proposed amendment of 802.15.3 MAC Standard.] 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. Song-Lin Young[Sharp Labs.]

  2. CTA Advertisement for Overlapping PiconetsSong-Lin YoungSharp Labs. of America, Inc. Song-Lin Young[Sharp Labs.]

  3. Contents • Introduction • Issues associated with PNC/beacon • CTA announcement mechanism • Conclusions and future work Song-Lin Young[Sharp Labs.]

  4. Introduction • Operations of 15.3 WPAN require devices to find a PNC (and its beacons) in order to engage in piconet activities. • Multiple piconet overlapping scenarios are expected to occur in a dynamic environment, such as home networking. • Device may start a piconet without knowing the existence of a nearby PNC. • Piconet consisting of portable devices may be carried around and brought into area of other piconets. • Changes of topology due to moving objects/people Song-Lin Young[Sharp Labs.]

  5. Device 2 Simple Piconet Configuration Device 1 Beacon PNC Beacon CTA 1 CTA 2 Superframe N Superframe N+1 CTA 2 Beacon Beacon PNC 1 CTA 1 CTA 1 Device 1 Device 2 Song-Lin Young[Sharp Labs.]

  6. PNC 1 PNC 2 Beacon Device 1 Device 1 PNC PNC 2 Beacon Device 2 Overlapping Piconets • PNC 2 is not able to hear beacons form PNC 1 • Device 2 is not able to hear beacons from PNC 1 Song-Lin Young[Sharp Labs.]

  7. Superframe Superframe PNC 1 CTA CTA Device 1 Beacon Beacon Beacon PNC 2 or Device 2 Interference Interference Potential Interference Scenario • Device 1 (PNC 1) is scheduled to transmit during the assigned CTA(s) • PNC 2/Device 2 will be interfered during Device 1 CTA if two piconets are not coordinated Song-Lin Young[Sharp Labs.]

  8. Basic Concept • A mechanism is needed to advertise piconet timing and CTA for those unassociated devices not covered by PNC • Extending the coverage area of beacons such that superframe timing and CTA information is available for: • Making it possible for devices to be aware of existing piconets via scan operation. • Better selection of channel/frequency usage. • Co-existence by sharing channel time Song-Lin Young[Sharp Labs.]

  9. CTA Duration CTA Location Beacon Frame Format p0 (Superframe starts) Superframe Duration Preamble Header CTA # 1 FCS CTA # 2 CTA # 3 CTA # n Dev A Address Dev B Address Stream Index Song-Lin Young[Sharp Labs.]

  10. Quasi-Beacon Frame Format p0 (Packet starts) • During transmission, the device advertises its CTA(s) containing duration and offset from beginning of superframe • Only corresponding CTA of transmitting device are advertised. • Superframe duration can also be included. • Applicable to Data, command, and Ack frame types. Preamble Header Data FCS Superframe Duration Frame Control CTA # n HCS Song-Lin Young[Sharp Labs.]

  11. Conclusions CTA Advertisement • Solve hidden node problem • Facilitate the following operations: • Coexistence of multiple piconets • Coordination/synchronization of piconets • Device discovery • Minimum overhead to each packet Song-Lin Young[Sharp Labs.]

  12. Future Work • Asymmetric data transfer • Delay Ack frames which occur less frequently • Streaming applications • No Ack frame Song-Lin Young[Sharp Labs.]

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