VIICalifornia 5 1 07 v3 JM

VII California Team Meeting: 

VII California Team Meeting May 1, 2007 Richmond Field Station (PATH)

Agenda Items: 

Agenda Items Federal Message We are an official site - what that may mean  (discussion) Demos:  ITSA Demo Video Booth TRB Summer Meeting 24 July… Testbed Build Items Recent ITS JPO Visit and Lessons Learned (especially with system reliability) Build Status / Progress Lessons Learned in Prepping for ITS JPO Visit Brief progress reports on: Intersection build Maintenance Backhaul To include discussion on Wireless Silicon Valley WiMax installation MCNU order VII California Website Research Status Tolling developments for VII California national effort to develop a VII tolling concept of operations tolling application for the VII POC in Michigan Radio Field Measurement Experiments Actions / Next Meeting?

Federal Message: We are ‘official’…: 

Federal Message: We are ‘official’… Discussion

DemosITSA: Video Handout (Joel) & Booth Discussion (Bill, Jim)TRB Summer Meeting: 

Demos ITSA: Video Handout (Joel) & Booth Discussion (Bill, Jim) TRB Summer Meeting

TRB Summer Meeting: 

TRB Summer Meeting Three TRB Committees  100 – 200 Attendees ITS Committee Vehicle-Highway Automation Committee (V-HA) Traffic Signal Systems Committee (TSSC) Important Government Stakeholders US DOT (RITA - ITS JPO, FHWA) Caltrans Other Detailed Arrangements Still in Process Hotel TBD Exact Itineraries for V-HA and TSSC Demo However… Fulcrum and Attraction is 24 July Demo Sunday, July 22 - TSSC subcommittee meetings Monday, July 23 - Full-day TSSC workshop on VII for traffic signal control Tuesday, July 24 TSSC business meeting in morning Technical demonstrations of VII California testbed in mid-day ITS/V-HA workshop on research about VII applications and implementation issues beginning in afternoon Wednesday, July 25 - ITS/V-HA workshop continues all day Thursday, July 26 - ITS/V-HA workshop concludes by noon.

Build Status / Progress: 

Build Status / Progress Ashkan Sharafsaleh Joel VanderWerf Others…

First, a Congratulations: 

First, a Congratulations This was an opportunity captured For VII California For each of the participating organizations For VII …

Maintenance Issues: 

Maintenance Issues California Ave T1 went down frequently Router replaced more than once Has been ok for several weeks Re-ran fiber at Page Mill & Charleston Broken by video installers New fiber converters at Quarry Curtner and Quarry have Denso issues May need to swap out WRMs

Signal Strength Issues: 

Signal Strength Issues Radios on 101 don't have good range Can't hear them in SB direction (RSUs are on NB direction) Had to change demo route Page Mill RSU signal weak Soft-reboot seemed to fix it at least once

Software Issues: 

Software Issues Need better signage filtering in vehicle Too many messages Directionality is not always clear E.g.: travel time from freeway exit to arterial Broadcast rate is not the same as display rate Looping vehicle confused the demo probe server Use the 511 server in future 511 probe server is in active development

Recommended List For 10 New MCNUs: 

Recommended List For 10 New MCNUs

New Installations on US-101: 

New Installations on US-101 Brittan and Marsh Road PATH RSEs Digi-Router at Marsh Road T1 at Brittan Marsh Road will be used for Curve Over-Speed experiments

WiMax Installation at Page Mill and El Camino Real: 

WiMax Installation at Page Mill and El Camino Real Progress and Plans DCX identified network switch with copper and fiber network ports, to be purchased and bench tested Pole identified for subscriber unit, wireless power verified Base station needs to be mounted on mast arm due to antenna radiation pattern, subscriber unit at the top. Network switch and power distribution placed on pole (not mast arm) midway between subscriber and base station (in separate enclosures) The antennas and RF unit need to be mounted on fixed base due to the 9" lead limit

Nominal Design: 

Nominal Design

Next Steps: 

Next Steps Gather equipment for bench test and bracket/mount/enclosure design and fabrication Verify Caltrans jurisdiction over pole Verify power and fiber pull distances from signal cabinet to top of pole and position of access port out of pole Check on the need to pull fiber from top of pole to mast arm (or outside conduit to allow copper network cabling to switch) Purchase AC to DC power supply (to reside in the signal cabinet) and bench test DCX to provide addresses and access to the Internet, PATH to develop backhaul software for the RSU DCX to arbitrate bandwidth usage internally (current backhaul application very small bandwidth, future applications unknown)

Other: 

Other Additional Backhaul Discussion Interface to Wireless Silicon Valley? MCNU Order

Website: A Work in Progress / Needs Information: 

Website: A Work in Progress / Needs Information www.viicalifornia.org

Research Status: 

Research Status Tolling (Telvent) Radio Field Measurements (PATH)

Bay Area 511 & VII: 

Bay Area 511 & VII Near Term tasks Probe Visualizer Link data source Virtual Toll Plaza Longer Term Options Virtual HOT lanes

Bay Area 511 & VII: 

Bay Area 511 & VII Probe Data Needs Multiple Snapshots in messages (bread crumbs) Standardization in provided speed Average over time since last snapshot Speed at time of snapshot Recent/Smoothed average

Bay Area 511 & VII: 

Bay Area 511 & VII Where will Probe Messages go? Near Term To CCIT To 511 TIC Which message set will we use? For Now Beyond

VII Tolling National Concept of Operations: 

VII Tolling National Concept of Operations Effort underway by OmniAir, sponsored by USDOT Develop a Concept of Operations Supports the POC in SE Michigan Web Conference and workshop to get toll industry input

POC Goals & Objectives (Tolling): 

POC Goals & Objectives (Tolling) Financial Transaction with Fast Moving Vehicle & Fixed Infrastructure Securely Conduct Transaction with VII System User (Toll Agency) and Vehicle Driver Multiple Accounts (Including Debit Accounts) Can Be Used Record Travel Lane Report Vehicle Classification

VII Tolling Use Case in POC: 

VII Tolling Use Case in POC

POC VII Tolling: 

POC VII Tolling Demonstrate how VII tolling will work Will not be connected to a back office Will not include enforcement

VII Tolling ConOps Status: 

VII Tolling ConOps Status Detailed outline of ConOps Identified people who will review and provide input Draft ConOps due in June Second draft due in September Final document in October

How Does National Effort Relate to VII CA?: 

How Does National Effort Relate to VII CA? ConOps will reflect stakeholder views of VII Tolling VII CA should be compatible Applications will be developed for POC How does VII CA application relate Is there still a need for VII CA application? POC does not incorporate back office POC does not address enforcement

Field Measurements of Vehicle to Roadside Communication Performance: 

Field Measurements of Vehicle to Roadside Communication Performance Susan R. Dickey 4/27/2007

Equipment Set-Up: 

Equipment Set-Up Assembly of three gumstix netduo expansion boards Antenna placement with 8 active OBUs on one vehicle

Location of RSU: 

Location of RSU Test 1 Fixed loads at receiver RSU @ 6th and Brannan in San Francisco Test 2 Fixed sending interval RSU @ 3rd and Townsend in San Francisco

Experiment Results – Test 1 (1): 

Experiment Results – Test 1 (1) Average of remote and local RSSI by GPS location The recv RSSI is higher when vehicle is closer to RSU

Experiment Results – Test 1 (2): 

Experiment Results – Test 1 (2) Probability of successful round trip transmission as a function of the interval between packet sends, for 1, 2, 4 and 8 nodes with varying packet sizes of 200, 400 and 800 Bytes

Experiment Results – Test 1 (3): 

Experiment Results – Test 1 (3) Time (in seconds) until the first 8000 bytes has been transmitted as a function of the interval between packet sends, for 1, 2, 4 and nodes with varying packet sizes of 200, 400 and 800 Bytes

Experiment Results – Test 2 (1): 

Experiment Results – Test 2 (1) Transaction delay for 8000 byte transaction as a function of data rate for 9 nodes, packet size 200 bytes with various testing routes, 10 millisecond interval between packet sends Transaction jitter (standard deviation of delay) as a function of data rate for 9 nodes, packet size 200 bytes with various testing routes, 10 millisecond interval between packet sends

Experiment Results – Test 2 (2): 

Experiment Results – Test 2 (2) Transaction delay for 8000 byte transaction as a function of data rate for 9 nodes, packet size 1400 bytes with various testing routes, 10 millisecond interval between packet sends Transaction jitter (standard deviation of delay) as a function of data rate for 9 nodes, packet size 1400 bytes with various testing routes, 10 millisecond interval between packet sends

Analysis (1): 

Analysis (1) R1: Trans. time decreases as sending interval increases. Reason: If sending interval is too short (rate is too high), there are many collisions. R2: Trans. time increases as sending interval increases. Reason: Sending interval is already long enough for contention resolution. Thus, channel is not well utilized (bandwidth lost). There is an optimal sending interval.

Analysis (2): 

Analysis (2) R1: Prob. of successful TX increases (up to a bounded prob. p) as sending interval increases. Reason: As sending interval increases, there are fewer collisions. R2: Prob. of successful TX approaches a limit when sending interval keeps increasing. Reason: Sending interval is already long enough for contention resolution. Thus, prob. of successful TX will not increase; instead, it is bounded by p, which is decided by PHY layer performance.

Future Work: 

Future Work The disadvantages of application layer only studies are obvious Physical layer effects that may be contributing to poor performance must be inferred indirectly. It is necessary to be able to integrate data acquired at all layers of the network stack for complete understanding. We plan to use this equipment to carry out further vehicle to roadside and vehicle to vehicle tests at VII California RSUs, in conjunction with more physical layer testing.

Actions / Next Meeting?: 

Actions / Next Meeting?