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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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