NYC Public ConOps Webinar

Stakeholder Questions/Answers

April 1, 2016

  1. How does New York intend to address GPS accuracy? What are your thoughts about GPS accuracy in dense urban environment? Any plans for location augmentation features? GPS accuracy is essential.  Cell tower triangulation is considered a fall back that is associated with large errors.  Differential correction requires system-wide wireless broadcast of the differential correction data (e.g., FM subcarrier, etc.).  Has dead reckoning been considered to supplement the GPS?

SAE J2945/1 states requirements for GPS accuracy needed for the DSRC vehicle system and will be referenced in our requirements.  We will be investigating additional techniques to augment location information as we move ahead.

  1. Will DSRC be used for V2I communication?  If yes, what equipment will exist at the intersection to support V2I communication?

DSRC be used for V2I communication.  The arterials described in the ConOps will be equipped with DSRC Road Side Equipment (RSE) to provide a communication link between Onboard Units (OBU) or SmartPhones and the infrastructure.  Additional locations near fleet terminal facilities, river crossings, and airports will also be equipped with RSE for the collection of performance data and application management.

  1. For V2I, besides DSRC, is there any other communication medium in the project?

No.  The only other medium used in the project is the existing NYCWiN wireless infrastructure for the backhaul communications between the RSE and the back office systems to support the CV operation including data collection, performance analysis, security management, CV operations management, and data processing for export.

  1. For BSM, will any portion of BSM II be supported, or, just BSM Part I?

BSM Part II will be supported per SAE J2945/1 for light duty vehicles.

  1. What collaboration effort will NYC DOT have, especially with academic institutes in NYC?

The NYC connected vehicle pilot project has partnered with the University Transportation Research Center that represents experts including those at Polytechnic Institute of New York University and other local universities.

  1. Will the TMC get involved in this pilot program?

Yes.  Equipment and network monitoring responsibilities will be incorporated into the TMC operations; in addition, the TMC will manage the performance data collection, and data processing to anonymize and export the data for research purposes.

  1. It was mentioned that speed throughout the city would be reduced from 30 to 25 mph.  Has that already been done and does/did it require retiming all the signalized intersections?

The speed limit reduction was implemented in November of 2014.  The signal retiming activities began prior to the implementation and continue.

  1. How do you see non-government fleets participating in the future?

It should be noted that UPS is not a government fleet and taxis which make up the bulk of the fleet participants are privately owned by a collection of different companies. The City is installing a standards based infrastructure that will support use of the DSRC by additional fleets and privately owned vehicles that adhere to the Connected Vehicle messaging and communications standards.

  1. Apart from the SCMS authentication system, are you using any additional security mechanisms?

Yes.  Additional information will be available in the final Security Management Operational Concept plan to be published later this year.

  1. What methodology will be used to monitor the state of health of the large number or RSU's?

The Connected Vehicle Reference Implementation Architecture web site has information about RSU monitoring in the documentation for the Infrastructure Management application under the core services. In addition we are adding online RF monitoring of the RSU.

  1. Data is encrypted as stored. What security prevents someone from installing a DSRC radio and collecting the data before written? What security credentials are involved to be part of the DSRC network?

The DSRC radio signals are available for all receivers.  The transmitting vehicle’s identity is obfuscated by algorithms detailed in SAE J2945/1.  The security credentials will be distributed through the next generation of the Security Credential Management System.  Note that the data is encrypted as it is stored in the vehicle such that its privacy is preserved over all links including the DSRC. 

  1. Why do you record only the "first" and "last" received BSM? 

These will be recorded to develop radio range “foot print” for the devices.  By using only the first and last, we can significantly reduce the bandwidth requirements for the backhaul infrastructure and the processing at the TMC.

  1. Wireless communications interference is a major issue for DSRC. What are your plans to test such interference?

Our concept is based on preliminary site tests to identify existing sources and using the radio frequency ranging described above to manage operations.

  1. Is there any plan to develop mobility application in the long run? If yes, what kind of applications?

New York City has an adaptive traffic system already deployed in mid-town Manhattan called Mid-town-In-Motion.  This project will look at substituting speed data from the connected vehicles for the existing speed data gathered through existing systems.

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