GROUP COMMUNICATION METHOD USING HIERARCHICAL CLUSTER HEAD IN MOBILE COMMUNICATION SYSTEM

摘要

A cluster between terminals performing group communications in a mobile communications system is formed. If a signal reception impossibility terminal is discovered among the terminals performing group communications, a cluster head designates a sub head among the terminals performing the group communications. If the terminal to receive information from the sub head cannot receive the information, the cluster head designates a sub-sub head. If a signal reception impossibility situation vanishes, the cluster head removes the sub head or sub-sub head designation.