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

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

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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: [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 [[email protected]]

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.]


Cta advertisement for overlapping piconets song lin young sharp labs of america inc

CTA Advertisement for Overlapping PiconetsSong-Lin YoungSharp Labs. of America, Inc.

Song-Lin Young[Sharp Labs.]


Contents

Contents

  • Introduction

  • Issues associated with PNC/beacon

  • CTA announcement mechanism

  • Conclusions and future work

Song-Lin Young[Sharp Labs.]


Introduction

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.]


Simple piconet configuration

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.]


Overlapping piconets

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.]


Potential interference scenario

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.]


Basic concept

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.]


Beacon frame format

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.]


Quasi beacon frame format

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.]


Conclusions

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.]


Future work

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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