The present invention provides a method executed by a base station, comprising: generating a first indication and a second indication for uplink transmission resource allocation for a tone group, wherein the tone group is used as a resource allocation unit and comprises one or more tones; and sending to a UE an RRC message including the first indication, and sending to the UE downlink control information carried by an NB-PDCCH, wherein the downlink control information includes the second indication. Accordingly, the present invention further provides a method executed by a user equipment, the method comprising: receiving, from a base station, an RRC message, wherein the RRC message comprises a first indication for uplink transmission resource allocation for a tone group; receiving, from the base station, downlink control information carried by an NB-PDCCH, wherein the downlink control information comprises a second indication for uplink transmission resource allocation for the tone group; and allocating resources for uplink transmission according to the first indication and the second indication. The present invention further provides a base station and a UE respectively executing the above-described methods.