Patent ID: 6542808
Filing Date: 2003-04-01
Classification: G08G,H04W

Abstract:
A method of determining an indication of length of a queue of vehicles on a road, using probe reports, transmitted according to a predetermined protocol, associated with the probe reports, to a mapping system which processes the probe reports, wherein a report includes a characteristic value of position of the probe, the method comprising:(a) constructing with the mapping system a plurality of mapping samples, (b) determining for each of the plurality of mapping samples a position that relates to the farthest probe position from a mapping focus; (c) choosing from the position determined in (b) the position which is the farthest from the mapping focus for determining an indication on length of the queue; and wherein the process of gathering position related updates from probes, associated with the construction of mapping samples, is being made through a dedicated radio channel in which probes transmit signals in pre-assigned slots in accordance with their position and other criteria, determined by a pre determined protocol.