doc.: ieee 802.11-03/476r1 submission july 2003 tim godfrey, intersil; broady cash, arincslide 1...
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July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 1
doc.: IEEE 802.11-03/476r1
Submission
DSRC Study Group Introduction
Dedicated Short Range Communications in the 5.9GHz band
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 2
doc.: IEEE 802.11-03/476r1
Submission
Background• In 1999, the FCC allocated 75MHz of spectrum at
5.850-5.925 GHz, right above the UNII band, for a “wireless link to transfer information between vehicles and roadside systems” and between vehicle systems.
• Congress directed the Department of Transportation to develop a standard to insure device interoperation in the DSRC band. This standard will form the basis for the FCC rules for this band. The Federal Highway Administration chartered ASTM to do the lower layer standards development.– DSRC standard ASTM E2213-02 is based on 802.11a
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 3
doc.: IEEE 802.11-03/476r1
Submission
FCC Status
• Spectrum allocated in 1999
• NPRM on rules underway in 2003– Comments have been filed– Non-controversial, general agreement to approach
and use of ASTM E2213 standard as basis for rules.
• Ruling expected by end of 2003
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 4
doc.: IEEE 802.11-03/476r1
Submission
ASTM DSRC Standard Status• ASTM E2213-02 is based on 802.11a
– Was published in 2002 (www.astm.org)– 2003 revision completed ballot in June 2003– 2003 revision to be published in August 2003
• Written as an amendment to the 802.11a amendment– Significant PHY changes, but specifically designed to allow
industry standard 802.11a chips to support DSRC– Minor MAC function additions – simple firmware updates to
industry standard 802.11 firmware
• ASTM/DSRC wants to move E2213 into IEEE 802.11– E2213 is difficult to read because it does not contain the complete text – Will be difficult to maintain with references IEEE 802.11 and IEEE 802.11a.
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 5
doc.: IEEE 802.11-03/476r1
Submission
DSRC specific IEEE Standards• DSRC is a complete communication protocol
– not just MAC and PHY
• IEEE standards are being developed for higher layers:
– IEEE P1556 Draft Standard for Dedicated Short Range Communications (DSRC) Security
– IEEE P1609.1 Draft Standard for Dedicated Short Range Communications (DSRC) Resource Manager
– IEEE P1609.2 Draft Standard for Dedicated Short Range Communications (DSRC) Application Services and and Management Entity
– IEEE P1609.3 Draft Standard for Dedicated Short Range Communications (DSRC) IP interface (Network Service)
– IEEE P1609.4 Draft Standard for Dedicated Short Range Communications (DSRC) Medium Access Control (MAC) Extension and Management Entity (MXME)
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 6
doc.: IEEE 802.11-03/476r1
Submission
Core DSRC Architecture
LAYER 1 - DSRC PHY
LAYER 2 - DSRC MAC
APPLICATION SERVICE LAYERS 5 - 7
APPLICATION MANAGER
LAYER 2 - LLC
MLME
PLCP/PLME
MXME
OTHER APPLICATIONs
NETWORK SERVICE LAYER 3 SME
UPPER LAYER MGMT
LAYER 2 - DSRC MAC EXTENSION
TRANSPORT SERVICE LAYERS 4
NETWORK MANAGER LAYER 3
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 7
doc.: IEEE 802.11-03/476r1
Submission
• Application –
• Application Manager –
• Application Service –
• Transport Service –
• Network Service –
• Logical Link Control –
• MAC Extension –
• Physical and Medium Access Control (MAC) -
User selected
IEEE 1609.1
IEEE 1609.2
IETF RFC 768/793
IEEE 1609.3
IEEE 802.2
IEEE 1609.4
ASTM E2213-02
Implements a useful process
Provides commands and a memory structure that applications can use to store information on a DSRC radio
Sends properly formatted data to establish communication links. Collects application registration information to build link establishment messages.
UDP - Routes data to the correct application (port) TCP - adds an error and sequence checking service
Routes data to the correct device on a network or across multiple networks
Routes data to the correct communications stack on a device
Routes data to the correct communications channel on a device
Implements the physical transfer of data over the air while exercising the proper controls to minimize data collisions and detect errors when they occur. Station Management provides the management data access to all layers.
Core DSRC Standards
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 8
doc.: IEEE 802.11-03/476r1
Submission
Applications• Safety
– Intersection collision warning, stopped vehicle hazard warning, emergency vehicle approach warning, work zone warning, road hazard warning, etc.
• Information: “Roadside Kiosk”– Traffic advisory, road construction, weather conditions, upcoming exit
services, map updates, etc.
• Internet Access Hot-Spots– Provided by service stations, truck stops, retail store parking lots, etc.
• Entertainment– Music & video download – Service providers and personal– Integration with home wireless LAN
• Fleet Management– Port of entry, asset tracking, security, scheduling
• Electronic Payment– Toll plazas, service stations, drive-through venues, truck stops, etc .
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 9
doc.: IEEE 802.11-03/476r1
Submission
Frequency (GHz)
5.8
50
5.8
55
5.8
60
5.8
65
5.8
70
5.8
75
5.8
80
5.8
85
5.8
90
5.8
95
5.9
00
5.9
05
5.9
10
5.9
15
5.9
20
5.9
25
5.8
25
5.8
30
5.8
35
5.8
40
5.8
45
US Spread Spectrum Allocation
Ch 172 Ch 174 Ch 176 Ch 180 Ch 184Ch 182Ch 178
US, Canadian, and Potential Mexican DSRC Allocation
Control ChannelService Channels
High Availability/Low Latency
Optional 20 MHz Optional 20 MHz
Primarily Public Safety High-power App.
“Reserved” for harmonization with potential extension of the UNII band
10 MHz Channels with 20 MHz combination options
North American Band Plan
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 10
doc.: IEEE 802.11-03/476r1
Submission
5 GHz Band International Plan
5 5,1 5,2 5,3 5,4 5,5 5,6 5,7 5,8 5,9 6
Europe
Japan
N. America
ISM band
CALM M5
Unlicen. W-LAN Regionally available: ISM+
shared unlicencedDedicated ITS (DSRC)
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 11
doc.: IEEE 802.11-03/476r1
Submission
Other Related Organizations
• US Department of Transportation– Federal Highway Administration– National Highway Traffic Safety Administration
• ITS America
• AASHTO – American Association of State Highway And Transportation Officials
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 12
doc.: IEEE 802.11-03/476r1
Submission
Uniqueness of DSRC Communication with vehicles at high velocities
Capability to communicate with all units
Capability to process individual broadcast messages
Extremely low latency tolerance – measured in single and dual digit milliseconds
Multiple channel operation during each session
Extremely close channel spacing
Widely varying unit power levels
Multiple overlapping uncoordinated communication zones (usually on different channels)
Operation in the automotive environment
Licensed operation
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 13
doc.: IEEE 802.11-03/476r1
Submission
Relationship to 802.16 and 802.20• How is this standard different when compared to 802.16
or 802.20?
– 802.16 and 802.20 are carrier oriented. The connection and data service is what is sold. • Typically operating in licensed bands.• Targeting ranges of many kilometers.
– DSRC is application and safety oriented. • The selling of “service” (as a carrier) is prohibited by FCC rules.• Short range (<1KM), dynamic, ad-hoc connections• Very low latency communication• Rapid initialization • Provides direct vehicle to vehicle communications
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 14
doc.: IEEE 802.11-03/476r1
Submission
Relationship to 4.9GHz• 802.11J is addressing the 4.9GHz spectrum in
Japan. – Some users have requested a 10MHz channelization option,
which is proposed to be the same as DSRC– Leverage work already being done for Japanese
requirement
• In the US, 4.9GHz is allocated for public safety. – The National Public Safety Telecommunications Council
administrates this spectrum– They are considering proposals to coordinate with DSRC
modulation and channelization.
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 15
doc.: IEEE 802.11-03/476r1
Submission
What will happen in 802.11?
• The ASTM DSRC committee is asking 802.11 to form a Study Group
– To develop an amendment to extend and modify the 5GHz PHY for the DSRC band, and incorporate necessary MAC changes.
– MAC changes apply only to the use of this specific PHY in this band.
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 16
doc.: IEEE 802.11-03/476r1
Submission
What changes to 802.11?• DSRC is based on the 11a and 11g OFDM PHY, with the
following primary differences:– The frequency range is 5.850-5.925 GHz– The channels are 10MHz wide, with two 20MHz options– The spectral mask has three additional configurations referenced to
power output– Additional classes of operation were added to the adjacent channel
rejection requirements. – An automotive environment temperature class is added – Specific channels have unique rules for operation
• Almost all units acquire the link on the “Control Channel” then switch to other channels for data transfer.
– A modified IBSS mode is used for rapid link acquisition– For privacy reasons, the MAC address is random
• Using Locally Administered address space• An algorithm to resolve duplicates is provided (a rare occurrence: 1 in
2^46 probability)
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 17
doc.: IEEE 802.11-03/476r1
Submission
Possible Timeline
• July 2003 – Meet in WNG– Submit and approve WG motion form Study Group
• September 2003 – SG meets – Write PAR and 5 Criteria, approve in WG
• November 2003 – 802 ExCom approves PAR and 5 Criteria– Begin work on first draft
• January 2004– Issue first draft to Letter Ballot
July 2003
Tim Godfrey, Intersil; Broady Cash, ARINC
Slide 18
doc.: IEEE 802.11-03/476r1
Submission
Motion
• Request that an 802.11 Study Group be formed to develop an amendment to extend and modify the 802.11 5GHz PHY to support DSRC technology in the 5.9GHz DSRC (Dedicated Short Range Communication) band, and incorporate necessary MAC changes.– Passed in WNG
• 40 for : 0 against : 31 abstain