A METHOD TO PLACE MICRO RADIO ZONES IN MOBILE PACKET COMMUNICATION WITH A CHAINED ISOLATED RADIO ZONE NETWORK SYSTEM

,The authors have already explored a mobile packet communication syste m for car drivers in which navigational information (maps, pictures, a nd voice) and stored information (voice message, facsimile, and data) could be sent by common format packets. Because the radio zones in the se systems are isolated from each other, efficient use of radio freque ncies is desirable. However, since traffic distribution and automobile speeds differ at different locations, the position and number of radi o zones has a large effect on system efficiency. This paper describes a method in which radio zones are placed on a given route network by u sing a car traffic flow simulator that is applicable to mobile communi cation. Car motion and speed are simulated; the volume of traffic in e ach 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 networ k. These values are compared with transmission efficiency in a single radio zone. Radio zones are located by deleting existing radio zones t hat have had poor transmission; relevant results are then discussed.