In the radio relaying system data download mode and the data download manner

摘要

PROBLEM TO BE SOLVED: To realize transmission time reduction and to attain effective use of a time slot. ;SOLUTION: A master station M send simultaneously down-load data to all relay stations A, B, C and slave stations A-D in the system. The relay stations A, B, C and the slave stations A-D store received down-load data and detect an error of the received down-load data due to a transmission line. The master station M and a host station of the relay stations A, B, C confirm an error with respect to a subordinate station such as the relay stations A, B, C and the slave stations A-D, and when the subordinate station detects the error, the subordinate station requests re- transmission of data and the host station receiving the request sends the data again. Since the down-load data are sent to all the slave stations A-F, the transmission time is reduced. Furthermore, even in the case of re-transmission of data due to an error, since the re-transmission is made to a host station only by one layer over, independent re-transmission by other subordinate station or the host station is attained and then the transmission time is reduced. Moreover, since a time slot of the station whose down-load is finished is released, the time slot is effectively utilized.;COPYRIGHT: (C)1999,JPO