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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANS). Submission Title: [THALES Coms motivation in IEEE 802.15.4a] Date Submitted: [March 2004] Source: [Fabrice Legrand] Company [THALES Coms] E-mail [[email protected]] Re: [] Abstract: [] - PowerPoint PPT Presentation
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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANS)
Submission Title: [THALES Coms motivation in IEEE 802.15.4a]
Date Submitted: [March 2004]
Source: [Fabrice Legrand] Company [THALES Coms] E-mail [[email protected]]
Re: []
Abstract: []
Purpose: [IEEE 802.15.4a]
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 or organization. The material in this document is subject to change in form and content after further study. The contributor reserves 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.
March 2004
Fabrice Legrand, Thales ComsSlide 2
doc.: IEEE 802.15-04/119r0
Submission
THALES Communications motivation in IEEE 802.15.4a
Fabrice Legrand
THALES Communicationss
March 2004
Fabrice Legrand, Thales ComsSlide 3
doc.: IEEE 802.15-04/119r0
Submission
THALES Coms applicationsTHALES Coms applications
Communications & localization in groups of firefighters, soldiers, …
• Communications between elements of the group in urban areas or obstructed areas
Data rate : 100 kb/sMultiple services : voice, dataOverall range : 1 km in free space by using multi-hops relayingRelaying at the MAC level (real-time)Sub-groups connectivity management (indoor conditions)
• Distance measurement between elements of the group (Homing function)0.1 m accuracy up to 30 m1 m accuracy up to 1000m
• Localization of the elements3D localization based on multiple stations, synchronized or notTOA & AOA measurements
March 2004
Fabrice Legrand, Thales ComsSlide 4
doc.: IEEE 802.15-04/119r0
Submission
THALES Coms applicationsTHALES Coms applications
Communications & localization in groups of hikers, …
• Communications between elements of the group in obstructed areasModerate voice data rate (64 kb/s)Overall range : 1 km in free space by using multi-hops
relayingRelaying at the MAC level (real-time)Sub-groups connectivity management (obstructed outdoor
conditions)• Distance measurement between elements of the group (Homing function)
Moderate range of distance measurement (30m)High accuracy of distance measurement (10 cm)Low cost product (mass market)
March 2004
Fabrice Legrand, Thales ComsSlide 5
doc.: IEEE 802.15-04/119r0
Submission
THALES Coms applicationsTHALES Coms applications
Sensors networks
• Low data rate sensors networkData rate : < 10 kb/sService : dataRange between a sensor and the collecting point : < 1 kmMulti-hops relayingMutual distance measurements
Collecting point& Gateway
March 2004
Fabrice Legrand, Thales ComsSlide 6
doc.: IEEE 802.15-04/119r0
Submission
THALES Coms applicationsTHALES Coms applications
LDRS : Low Data Rate sensorHDRS : High Data Rate sensor
HDRS
HDRS
Collecting point & Gateway
LDRS
LDRS
LDRS
LDRS
LDRS
LDRS
LDRS
LDRS
LDRS
Sensors networks
• Low and High data rate sensors network Combination of Low Data Rate (LDRS) and High Data Rate Sensors (HDRS) such as day/night camera, ... LDRS always active, HDRS in stand-by mode and activated when activity detected by LDRS close to it
March 2004
Fabrice Legrand, Thales ComsSlide 7
doc.: IEEE 802.15-04/119r0
Submission
THALES Coms UWB competencies (1)THALES Coms UWB competencies (1)
MAC, relaying & routing procedures
In an ad hoc topology, the access protocol can be :
Fully distributed : no particular node used for synchronization or resource allocation Pseudo distributed : any node can be used to synchronize the network and allocate resources
Fully distributed MAC protocol (SEBROMA, French RNRT ERABLE program ) : Use of different THCs, among which 1 for common signaling channel (THsign) Receiver oriented: potential receivers send RTC messages (Ready To Communicate) on THsign After reception of a RTC, RTS / CTS packets exchange on a randomly chosen code. Possibility to differentiate packets priorities (by using sub windows)
Fields of the RTC frame (THsign) RTS/CTS exchange
RTS contention window
Decision period
CTS contention window
Sub-window
1
Sub-window
2
Sub-window
3
Sub-window
4
Sub-window
1
Sub-window
2
Sub-window
3
Sub-window
4
Synchronization sequence
Node IDInformation
fieldTH
code
March 2004
Fabrice Legrand, Thales ComsSlide 8
doc.: IEEE 802.15-04/119r0
Submission
THALES Coms UWB competencies (2)THALES Coms UWB competencies (2)
MAC, relaying & routing procedures
Pseudo distributed MAC protocol : Adaptation of the IEEE 802.15.3 standard (IST project U.C.A.N.) to impulse-based UWB Suppression of the Contention Access Period (because of clear channel assessment problem) Addition of a relaying possibility at MAC level (intra-piconet) Special procedures added for distance measurement, information can be used for routing MAC implementation on a Software/Hardware demonstration platform
Further developments/studies foreseen : Other fully distributed protocols to comply with 802.15.SG4a expectations (low complexity, size
and power consumption) Improvements of low-level relaying and routing (delay constraints)
March 2004
Fabrice Legrand, Thales ComsSlide 9
doc.: IEEE 802.15-04/119r0
Submission
ConclusionConclusion
• Wide range of needs for location-aware, low data rate and low-power applications (civil and military)
• Objectives of Thales Coms. – Wireless Activity:– Help and support the standardization for such applications
– Bring our experience in UWB (PHY-MAC close interactions)
– Promote a solution for efficient networking: • low range, potentially large areas fast relaying and routing• high number of devices fast deployment and reconfigurabilty
March 2004
Fabrice Legrand, Thales ComsSlide 10
doc.: IEEE 802.15-04/119r0
Submission
ReferencesReferences
[1] H. Anouar, Y. Souilmi and C. Bonnet, “Self-Balanced Receiver-Oriented MAC for Ultra-wideband Mobile Ad-Hoc Networks, IWUWBS 2003 Proceedings, June 2003.
[2] F. Legrand, I. Bucaille and al., “U.C.A.N.’s Ultra Wide Band System: MAC and Routing protocols”, IWUWBS 2003 Proceedings, June 2003.