The compromise between the utilization rate of valuable satellite channels and the blocking probability of new call was hardly to achieve.Enlightened by the advantages of ad hoc networking

a new scheme was proposed which al-lowed the terminals to work in alternative mode according the instructions from the satellite’s signaling channel

meaned to communicate with other terminals in ad hoc mode when they were in a distance shorter than the maximum ad hoc communication distance and when the system was in busy state or in normal satellite communication mode when the system was idle.So the overflow traffic in nearer distance might get serviced with ad hoc mode and the system’s parame-ters was improved.Simulation results show that the proposed scheme has decreased the realistic call blocking probability and increased the valid channel utility rate of the system.