1. April 2009
doc.: IEEE /xxxxr0
May 2014
IEEE Regulatory SC DSRC Coexistence Tiger Team Summary of activities since March F2F
Date:
Authors:
Jim Lansford, CSR Technology
Rich Kennedy, Research In Motion

2. April 2009
doc.: IEEE /xxxxr0
May 2014
Abstract
Summary of activities in the IEEE (Regulatory Standing Committee) DSRC Coexistence Tiger Team since the March F2F in Beijing.
Jim Lansford, CSR Technology
Rich Kennedy, Research In Motion

3. May 2014
Background
FCC allocated 75MHz of spectrum in the 5.9GHz band ( MHz) for Dedicated Short Range Communications (DSRC) in October 1999
 In FCC NPRM (13-49), the FCC requested comments on a potential sharing of the DSRC band, to understand if a feasible sharing solution that protects DSRC users could be developed.
DSRC would remain as a primary user of the band
The new band would be designated U-NII-4
802.11ac could be modified to operate in this new UNII-4 band if approved by the FCC
FCC did not specify the framework or etiquette by which band sharing would occur
Jim Lansford, CSR Technology

4. Work to date Objectives of the group Possible work items Final report
May 2014
Work to date
Objectives of the group
   Create a document that describes and quantifies possible coexistence mechanisms between DSRC and extensions of the base standard in the proposed UNII-4 band, if the FCC allows such band sharing in a future R&O.
Possible work items
   > Review of ITS/DSRC field trials
   > Review of work to date on coexistence
> Presentations on use cases
> Presentation of possible coexistence approaches
   > Modeling/simulation of possible coexistence approaches
   > Testing, field trials, and presentation of results from proposed prototype approaches
Final report
> Includes outputs from all work items
> One or more “snapshots” (summary of work to date) will be provided to FCC
* First snapshot in mid-January
Jim Lansford, CSR Technology

5. Activities since March F2F
May 2014
Activities since March F2F
Presentation on CCA: 25 April 2014
Agenda:
Presentation:
Minutes:
Presentation on DSRC and spectrum sharing in Europe
Agenda:
Presentation:
Minutes: Not posted yet
Jim Lansford, CSR Technology

6. Highlights from CCA discussion
May 2014
Highlights from CCA discussion
Add new 10MHz CCA to ac
Use Carrier Sense of p preamble, NOT energy detect
No Changes to DSRC
Similar to a protection, but 10MHz CCA
Some changes to ac
New CCA for 10MHz BW – not in existing spec
DSRC Channels 172 and 178 sensed with CCA – other channels TBD
CCA for 10MHz BW exactly the same as a detection at ½ clock rate
13/994r0 suggests a “NAV” during and for 10 seconds after the last PHY-CCA.indication(BUSY,(DSRC10_CCA))
Other details: CCA level, SIFS, slot times, etc. need to be worked out
802.11p PPDU
Jim Lansford, CSR Technology

7. Future Work Anticipated presentations between now and San Diego
May 2014
Future Work
Anticipated presentations between now and San Diego
Additional presentations on existing proposal(s)
Channel models
Additional coexistence proposals
Some initial simulation results expected in the summer
Invitation for future presentations:
How CCA works
DSRC field trials
Use cases
Proximity of public access points to heavily traveled highways
Jim Lansford, CSR Technology

8. References DSRC Summary May 2014
FCC NPRM (changes to 5GHz band rules, including proposed UNII-4 band):
FCC Comments
FCC Reply Comment framework document
FCC Comments survey
FCC Reply Comments
Letter to FCC OET from IEEE 802 regarding DSRC Coexistence Tiger Team activities  
DSRC Summary
Jim Lansford, CSR Technology

9. May 2014
References (2/2)
IEEE submissions on DSRC (since p was ratified)
Jim Lansford, CSR Technology