Patent ID: 8654729

Claim:
A base station, comprising: a wireless transceiver, being configured to communicate with a plurality of first wireless devices of a first group and a plurality of second wireless devices of a second group; and a processor electrically connected to the wireless transceiver, being configured to execute the following operations: defining a first time interval and instructing the wireless transceiver to receive a plurality of first uplink transmission requests of the first wireless devices and a plurality of second uplink transmission requests of the second wireless devices within the first time interval, approving one of the second uplink transmission requests within the first time interval, defining a second time interval behind the first time interval, and instructing the wireless transceiver to receive second uplink transmission data of the second wireless device corresponding to the approved second uplink transmission request within the second time interval, and defining a third time interval behind the second time interval, and instructing the wireless transceiver to receive the uplink transmission requests of the second wireless devices corresponding to the unapproved second uplink transmission requests within the third time interval.