A method to place micro radio zones in mobile packet communication with a chained isolated radio zone network system

Abstract

AbstractThe authors have already explored a mobile packet communication system for car drivers in which navigational information (maps, pictures, and voice) and stored information (voice message, facsimile, and data) could be sent by common format packets. Because the radio zones in these systems are isolated from each other, efficient use of radio frequencies is desirable. However, since traffic distribution and automobile speeds differ at different locations, the position and number of radiozones has a large effect on system efficiency. This paper describes a method in which radio zones are placed on a given route network by using a car traffic flow simulator that is applicable to mobile communication. Car motion and speed are simulated; the volume of traffic in each radio zone and the traffic that can be processed in each zone are calculated using a model that is quite close to an actual route network. These values are compared with transmission efficiency in a single radio zone. Radio zones are located by deleting existing radio zones that have had poor transmission; relevant results are then discussed.