Patent ID: 6192251
Filing Date: 2001-02-20
Classification: H04W

Abstract:
A communication system which performs communication between a first terminal and a second terminal via a communication network under control of a management station for managing said communication network, wherein:said first terminal includes a transmitter which transmits to the management station recall data including an ID of said second terminal and state information specifying a predetermined state of said second terminal; andsaid management station includes a memory which stores the recall data and a transmitter which sends to said first terminal a notification when said second terminal has entered the predetermined states;and wherein the predetermined state is a state in which said second terminal enters or leaves one of: (i) a predetermined service area of a public base station of said communication network set to connect said terminals to said communication network via a wireless channel, and (ii) an electromagnetic wave reachable range of a master unit connected to said communication network and having a function of connecting at least a predetermined terminal which has been registered in advance to said communication network.