ABSTRACT I. Introduction II. A classified wireless communication method for PTIS 1. Detection and Tracking of Bus Location 2. Wide range Communication Link to transmit Location Information 3. Various models of Bus Information and Management System III. Implementation of PTIS mode 1 [2] 1. Introduction 2. Wireless Packet Data Network of BMS system [3] 3. Central system of Seoul BMS [4] 4. Local equipment of Seoul BMS 5. Conclusions References