BANDWIDTH AND POWER MANAGEMENT ISSUES IN SWIFT

SWIFT (Seattle Wide-area Information For Travelers) is an operational test for an advanced traveler information system. The SWIFT project began in January 1995 in the Seattle metropolitan area with the aim of testing the feasibility of employing an FM subcarrier communication link to deliver information to travelers. Specifically, SWIFT uses an advanced 19 Kbps FM subcarrier broadcast medium for the delivery of transportation information and personal paging information. The FM subcarrier appears to be an inexpensive and efficient means for delivery of transportation and personal paging information to users, whether they are at home, in the office, or on the road. Three types of end user devices were considered for SWIFT operational test: the message watch, car radio, and a personal digital assistant (PDA). These devices have different processing and display capabilities. It is shown that SWIFT communication protocol allows a trade off between battery life and paging delay. Real-time and yellow pages information may be easily processed in a PDA and presented to users through an appealing user interface. However, real-time applications are very sensitive to paging delay. The paging messages regarding the transit vehicle locations, traffic conditions, etc., have to be transmitted immediately as they arrive at the information clearing house. This requires the end user devices, such as PDA and the car radio, to stay in receiving mode all the time. The devices can be charged or connected to a car battery for continuous receiving mode of operation. Message watch, on the other hand, depends on its battery and cannot stay on continuously. Hence, the message watch should be used for less time sensitive user applications, such as ride share matching, incident, accident information, etc.

• Supplemental Notes:
  • Five volumes of papers and one volume of abstracts comprise the published set of conference materials.
• Corporate Authors:

  VERTIS

  TORANOMOM 34 MORI BUILDING 1-25-5
  TORANOMON, MINATOKU, TOKYO 105  Japan 
• Authors:
  • Tantawi, A N
  • Doganata, Y N
• Conference:
  • Steps Forward. Intelligent Transport Systems World Congress
  • Location: Yokohama, Japan
  • Date: 1995-11-9 to 1995-11-11
• Publication Date: 1995-11

Language

• English

Media Info

• Pagination: p. 1499

Subject/Index Terms

• TRT Terms: Bandwidth; Driver information systems; Electric batteries; Energy consumption; Intelligent transportation systems; Passenger information systems; Real time control; Route guidance; Service life; Traveler information and communication systems
• Geographic Terms: United States
• Old TRIS Terms: Advanced systems; Battery life; Power requirements; Real-time systems
• Subject Areas: Design; Energy; Highways; Operations and Traffic Management; Planning and Forecasting; Public Transportation; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00723426
• Record Type: Publication
• Report/Paper Numbers: Volume 4
• Files: TRIS
• Created Date: Jul 23 1996 12:00AM