LOCATION DEPENDENT DATA MULTICASTING IN INTELLIGENT TRANSPORTATION SYSTEM AND ITS EVALUATION

Traffic congestion will cause a number of mobile hosts to be densely distributed in an area, with most of these mobile hosts requiring commonly useful driving-related information. It would be very effective to provide such information by using a common communication channel. In fixed networks, Internet protocol (IP) multicast is a well-known mechanism providing efficient point-to-multipoint data delivery. However, no studies have focused on how to handle mobile hosts as a member of a multicast group. This paper introduces a "base station (BS) multicast group," that is the set of base stations under which the mobile hosts belong to the same multicast group in a given area. Furthermore, the authors define new messages to control the BS multicast group based on the group management messages in IP multicast. Advanced Join mechanism, that manages the base stations in the BS multicast group by the control messages according to the movement of mobile hosts, eliminates lost packets during the movement of mobile hosts between the base stations. Evaluation results via a road model simulator show using the proposed mechanism improves the average rate of data reception of mobile hosts and also decreases the elapsed time until a mobile host completes data reception by more than 33%. Moreover, it is recognized that a data retransmission method must be provided to achieve more reliable data delivery to moving mobile hosts. A simple data retransmission method called TOA (the order of arrival) is proposed that, when applied to the advanced join mechanism, can significantly increase the number of mobile hosts that complete the data reception.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00964735
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Oct 25 2003 12:00AM