| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide the radio multicast data transfer method and the radio communication system using the method which can decrease the number of answers from a receiving station. SOLUTION: A radio ground station 100, after multicasting a frame request answers of receiving station groups 210 and 220 by polling, resends the frame a time interval T1 when a negative answer is returned. A mobile station as an object of the polling sends an affirmative answer when receiving the frame correctly and a negative answer when not. Mobile stations other than the object mobile station of polling monitor the answer that the object mobile station of polling sends, and send a negative answer when the time interval T4, which is the product of a time interval T2 larger than the time T1 and a natural number (n) selected at random, elapses after the affirmative answer moniloring is started, if the affirmative answer and the frame could not be received correctly.</p> |
