workshop06 yin

8/11/2019 Workshop06 YIN

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Wireless MultimediaWireless Multimedia

Introduction to IEEE 802.15.3 High RateIntroduction to IEEE 802.15.3 High Rate

Wireless Personal Area Network (WPAN)Wireless Personal Area Network (WPAN)

Zhanping Yin and Victor C.M. LeungElectrical and Computer Engineering

University of British Columbia

E-mail: {zhanping; vleung}@ece.ubc.ca


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AgendaAgenda

Why 802.15.3?

IEEE 802.15.3 WPAN Introduction Overview

Superframe structure

Type of piconets

Larger scale network - Scatternet

Some existing issues and several proposed solutions

Conclusion


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Motivated by the increasing demand of wireless communications with Ubiquitous network connectivity

Low cost and low power consumption -> WPAN High data rate (HDR)

Quality of Service (QoS) support

Comparison with other short to medium range wireless technologies Wireless LAN (WLAN)

High cost and power consumption, no hard QoS guarantee

WPANs - Bluetooth (802.15.1) and ZigBee (802.15.4) Data rate too low

Applications of 802.15.3 Virtual wireless multimedia connectivity

Video/audio distribution

High speed data transfer

Why 802.15.3?Why 802.15.3?


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802.15.3 = Wireless Multimedia802.15.3 = Wireless Multimedia


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Physical Layers (PHY) for 802.15.3Physical Layers (PHY) for 802.15.3

The 802.15.3 standard specifies a PHY at 2.4GHzband

Ultra-wideband (UWB) holds great promise in HDR-WPAN, and is anideal candidate for 802.15.3 alternative PHY

Unfortunately, efforts of an IEEE standard UWB PHY failed with thedissolution of 802.15.3a task group in Jan. 2006. However,

TG3a consolidates 23 UWB PHY specifications into two proposals MultiBand Orthogonal Frequency Division Multiplexing (MB-OFDM)

UWB, supported by the WiMedia Alliance In Dec. 2005, ECMA approved a PHY and MAC standard (ECMA-368) with

MB-OFDM UWB PHY + a distributed MAC

Direct sequence-UWB (DS-UWB), supported by the UWB Forum Still using the 802.15.3 MAC

Formed in March 2005, the 802.15.3c Task Group is developing analternative PHY based on millimeter-wave (mmWave) for 802.15.3


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The 802 Wireless SpaceThe 802 Wireless Space

Data Rate (Mbps)

Range

ZigBee

802.15.4802.15.3

802.15.3a802.15.3c

WiFi

802.11

10 100 1000

WPAN

WLAN

WMAN

WWAN

0.01 0.1 1

Bluetooth

802.15.1

IEEE 802.22

WiMax

IEEE 802.16

IEEE 802.20


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IEEE 802.15.3 OverviewIEEE 802.15.3 Overview

High date rate and low power

Mainly works within a piconet withdynamic DEV membership

Ad hoc topology with centralized

control by the PNC Connection oriented peer-to-peer

communications

Support for multimedia quality ofservice (QoS)

Multiple power management modes

Security

1st

Qtr

2nd

Qtr

3rd

Qtr

4th

Qtr

East

West

North


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IEEE 802.15.3IEEE 802.15.3 SuperframeSuperframe andand

Access MethodsAccess Methods Timing and data transmissions based on the superframe controlled by PNC A superframe consists of three parts

Beacon

Sent by PNC, set the timing allocations and communicate management information

Contention Access Period (CAP)

CSMA/CA access, for commands and asynchronous data

Channel Time Allocation Period (CTAP)

Two types: Management CTA (MCTA) and CTA

TDMA with guaranteed start and end time

Efficient data transfer with full QoS support

Good power management

Channel access in open and associate MCTA use slotted aloha


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Piconet VariationsPiconet Variations

Child piconet To extend the piconet coverage area

To shift some computational/memory requirements to another DEV

Child PNC also belongs to the parent piconet

Neighbor piconet

Share the frequency spectrum between different piconets when there areno vacant PHY channels

Neighbor PNC not part of the parent piconet

A child/neighbor piconet acts as an autonomous piconet but

dependent on a private CTA from the parent piconet


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IEEE 802.15.3 ScatternetIEEE 802.15.3 Scatternet

Parent and Child/Neighbor piconets share common frequency channel Independent piconet is either far enough apart or on different frequency

channel

DEVs in different piconets can not exchange data with each other unlessthere is a DEV associated with both piconets and acting as a bridge

Parent PNC

Child/neighbor PNC

Independent PNC

DEV

Peer-to-peer

data transmission

Piconet relationship

Bridge DEV


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Existing IssuesExisting Issues

Peer discovery is crucial to piconet operations. Standard peer discovery is unreliable and leads

to substantial delays for unreachable DEV pairs Full piconet connectivity is not guaranteed withonly direct peer-to-peer communications

The standard 802.15.3 MAC does not takeadvantage of the unique ranging capabilitiesenabled by UWB

Connections are in peer-to-peer manner withoutconsider of possible route optimizations

MAC modeling and performance evaluation Stream time scheduling methods not defined in

the standard

Scatternet formation is still an open issue

Problems:

DEV_1 cannot communicate withDEV_4 in peer-to-peer manner For traffic between DEV_1 and

DEV_3, is it better to forward viaPNC than the direct connection?

What is the optimal path and datarate between DEV_3 and DEV_5?


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Summary of Work AccomplishedSummary of Work Accomplished

A Third-Party Handshaking Protocol (3PHP) with active involvement ofPNC, is proposed for fastpeer discovery and link reestablishment with

high efficiency, reliability and full connectivity guarantee.

An intra-piconet route optimization scheme is proposed withapplication awareness in consider of multi-rate support. With a self-

learning manner for information gathering, no message exchangeoverhead is introduced.

Scatternet formation issue is addressed with Connection data rate optimization of IEEE 802.15.3 scatternets with

multi-rate carriers.

A stochastic formation algorithm is proposed without informationgathering by explicit message exchange.


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ConclusionConclusion

IEEE 802.15.3 is optimized for wireless multimedia

Designed for high rate WPAN, 802.15.3 supports Peer-to-peer communications

Quality of Service

UWB is an ideal alternative PHY for 802.15.3 WPAN

Some open issues are discussed with several proposed solutions


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ReferencesReferences

IEEE Standard 802.15.3, Wireless medium access control (MAC) andphysical layer (PHY) specifications for high rate wireless personal area

networks (WPANs), Sept. 2003. Z. Yin and V.C.M. Leung, Third-Party Handshake Protocol for

Efficient Peer Discovery in IEEE 802.15.3 WPANs, in Proc. IEEEBroadNets2005, Boston, MA, Oct. 2005.

Z. Yin and V.C.M. Leung, Third-Party Handshake Protocol forEfficient Peer Discovery and Route Optimization in IEEE 802.15.3WPANs, accepted for publication in ACM/Kluwer J. Mobile Networksand Applications, Nov. 2005.

Z. Yin and V.C.M. Leung, Connection Data Rate Optimization ofIEEE 802.15.3 Scatternets with Multi-rate Carriers, IEEE ICC06,Istanbul, Turkey, June 2006.


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