Patent ID: 8670759
Filing Date: 2014-03-11
Classification: H04B,H04L,H04M,H04W

Abstract:
1. A communication system, comprising: a first mobile communication terminal which includes a broadcast communication unit which functions to establish a broadcast communication path for wide area communication through a mobile communication network to simultaneously connect to a plurality of second mobile communication terminals which are grouped and registered in advance in the mobile communication network and a push to talk function to simultaneously send packet data to the plurality of second mobile communication terminals, like a transceiver, for providing a data communication path; a first near field wireless communication terminal which includes a wireless communication unit which establishes ad hoc wireless communication to said first mobile communication terminal only within a range of near field wireless communication; a plurality of second mobile communication terminals, each connects to the first mobile communication terminal and other second mobile communication terminals through the broadcast communication path; and a plurality of second near field wireless communication terminals, each corresponds to the second mobile communication terminals respectively and capable of carrying out ad hoc wireless communication to the corresponding second mobile communication terminal only within a range of near field wireless communication, and wherein, when said first near field wireless communication terminal sets up a first ad hoc communication path to connect to the first mobile communication terminal existing nearby through the use of the near field wireless communication with a request to connect to the second near field wireless communication terminals which are arranged outside a range of the near field wireless communication, the first mobile communication terminal responding to the request connects the first ad hoc communication path to the broadcast communication path and repeats the request to the second mobile communication terminals through the broadcast communication path, and wherein, each of the second mobile communication terminals, responding to the request received through the broadcast communication path, establishes a second ad hoc communication path to the corresponding second near field wireless communication terminal using the near field wireless communication, connects the broadcast communication path to the second ad hoc communication path, and carries out data communication among the first near field wireless communication terminal and the second near field wireless communication terminals by use of the push to talk function.