| 摘要 |
PURPOSE:To save the battery of a mobile device by dividing a communication time allocated to respective groups into plural time slots further, and repeating the selection of a random number time slot and the transmission of inherent information at a slot until respective mobile station sides receive the understanding code of its own station address from a base station. CONSTITUTION:The communication time allocated to respective groups is further divided into plural time slots, and respective mobile stations M1 and M2 transmit respective inherent information IDN1 and LDN2 with the time slot selected respectively arbitrarily and in a random number. A base station side transmits understanding codes ACK1 and ACK2 to the mobile stations M1 and M2 to be able to receive the inherent information IDN1 and IDN2 without overlapping, respective mobile stations M1 and M2 side, until they receive the understanding codes ACK1 and ACK2 of its own station address from a base station, repeats the selection of a random number time slot and the transmission of the inherent information IDN1 and IDN2 at a slot and total communication between the base station and all mobile stations M1 and M2 can be completed. Thus, by repeating plurally the response operation, the number of the mobile stations of the recognition object is successively decreased and the recognition rate can be successively improved. |
