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V2X ITS协议栈介绍.pdf
Vehicle Networks V2X communication protocols Univ.-Prof. Dr. Thomas Strang, Dipl.-Inform. Matthias Röckl
Outline
Wireless Access for Vehicular Environments Rationale
Wireless Access for Vehicular Environments (WAVE) IEEE 802.11p + 1609.x + SAE 2735
Wireless Access for Vehicular Environments Overview
IEEE 802.11p Requirements
IEEE 802.11p Overview
IEEE 802.11p Communication entities
IEEE 802.11p Vehicle-2-Pedestrian
IEEE 802.11p Pedestrian?
V2X frequency bands
IEEE 802.11p Frequency band
IEEE 802.11p Multi-channel
IEEE 802.11p Operation modes
IEEE 802.11p PHY
IEEE 802.11p PHY: Comparison to IEEE 802.11a
IEEE 802.11p MAC
IEEE 1609.4 Extension for multi-channel coordination
IEEE 1609.4 Channel Coordination
IEEE 1609.3 Networking Services
IEEE 1609.3 WAVE Short Message Protocol (WSMP)
SAE J2735 Message Dispatcher
SAE J2735 Basic message set definition
Car-2-Car Communication Consortium (C2C-CC) & ETSI TC ITS
Car-to-Car Communication Consortium Partners
Car-2-Car Communication Consortium Protocol stack
Car-to-Car Communication Consortium Objectives of the First Demonstration (October 2008)
Demonstration self-restricted to just two message types: CAM and DEN
Use Cases – Warning of Road Works
Use Cases – Emergency Vehicle (EV)
Use Cases – Broken Down Vehicle / Post Crash Warning
Use Cases – Motorcycle Warning / Intersection Assistance
Car-2-Car Communication Consortium Focus and on-going discussions
Car-2-Car Communication Consortium / ETSI TC ITS Relationship
Vehicle Networks
V2X communication protocols
Univ.-Prof. Dr. Thomas Strang, Dipl.-Inform. Matthias Röckl
Outline
Wireless Access for Vehicular Environments (WAVE)
IEEE 802.11p
IEEE 1609.1-4
SAE 2735
Car-2-Car Communication Consortium & ETSI TC ITS
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Wireless Access for Vehicular Environments
Rationale
What was the motivation behind a vehicle specific WLAN? What
prevented the existing IEEE 802.11-family from being adopted as is?
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9 Wireless Access for Vehicular Environments (WAVE)
IEEE 802.11p + 1609.x + SAE 2735
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Wireless Access for Vehicular Environments
Overview
No. of
layer
ISO/OSI
ref model
Data Plane
Management Plane
7 Application
e.g. HTTP
Transport
TCP/UDP
Network
IPv6
WAVE
Application
(Resource Manager)
WSMP
Data Link
Physical
802.2 LLC
WAVE MAC
WAVE Physical Layer
Convergence Protocol (PLCP)
WAVE Physical Medium
Dependent (PMD)
MAC
MAC
Management
Management
PHY
PHY
Management
Management
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SAE J2735
IEEE 1609.1
IEEE 1609.2
IEEE 1609.3
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IEEE 1609.4
IEEE 802.11p
4
3
2b
2a
1b
1a
1609.1 Resource Manager
1609.2 Security Services
1609.3 Networking Services
1609.4 Multi-channel operations
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IEEE 802.11p
Requirements
Changes in baseline 802.11 standards are required to:
support longer ranges of operation (up to ~1000 meters),
the high speed of the vehicles (up ~500 km/h relative velocities),
the extreme multipath environment (many reflections with long
delays (up to ~5 μs max excess)),
the need for multiple overlapping
ad-hoc networks to operate with
extremely high quality of service,
and
the nature of the automotive
applications (e.g. reliable
broadcast) to be supported.
Based on: IEEE 802.11p & Tan (2008):
Measurement and Analysis of Wireless Channel
Impairments in DSRC Vehicular Communications
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IEEE 802.11p
Overview
IEEE 802.11p is based on:
IEEE 802.11a PHY: OFDM modulation
IEEE 802.11 MAC: CSMA/CA
IEEE 802.11e MAC enhancement: message prioritization
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IEEE 802.11p
Communication entities
Communication between:
roadside units and mobile radio units (Vehicle-2-Infrastructure),
mobile units (Vehicle-2-Vehicle), or
portable units and mobile units (Vehicle-2-Pedestrian)
Infrastructure:
Roadside Units (RSUs)
Gantries (e.g. tolling gantries)
Poles, traffic lights, etc.
Mobile/Portable equipment:
On-board Unit (OBU)
Based on IEEE 802.11p
Denso DSRC platform
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