A network device, comprising: a transmitter; and a receiver, wherein the transmitter is configured to send a broadcast frame, wherein: the broadcast frame comprises first duration information and second duration information; the first duration information is configured to indicate a first time range of association beamforming training, A-BFT, for a first user equipment, wherein a first timeslot being selected randomly from the first time range by the first user equipment; the second duration information is configured to indicate a second time range of A-BFT for a second user equipment, wherein a second timeslot being selected randomly from second time range by the second user equipment; the first user equipment and the second user equipment correspond to different communications standards from one another and wherein an access priority of the second user equipment is higher than an access priority of the first user equipment, and the second time range is greater than the first time range; and wherein the receiver is configured to: receive a first-type frame from the first user equipment in the first timeslot randomly selected from the first time range; and receive a second-type frame from the second user equipment in the second timeslot randomly selected from the second time range; wherein a transmission duration of the first-type frame is greater than a transmission duration of the second-type frame. a transmitter; and a receiver, wherein the transmitter is configured to send a broadcast frame, wherein: the broadcast frame comprises first duration information and second duration information; the first duration information is configured to indicate a first time range of association beamforming training, A-BFT, for a first user equipment, wherein a first timeslot being selected randomly from the first time range by the first user equipment; the second duration information is configured to indicate a second time range of A-BFT for a second user equipment, wherein a second timeslot being selected randomly from second time range by the second user equipment; the first user equipment and the second user equipment correspond to different communications standards from one another and wherein an access priority of the second user equipment is higher than an access priority of the first user equipment, and the second time range is greater than the first time range; and wherein the receiver is configured to: receive a first-type frame from the first user equipment in the first timeslot randomly selected from the first time range; and receive a second-type frame from the second user equipment in the second timeslot randomly selected from the second time range; wherein a transmission duration of the first-type frame is greater than a transmission duration of the second-type frame. the broadcast frame comprises first duration information and second duration information; the first duration information is configured to indicate a first time range of association beamforming training, A-BFT, for a first user equipment, wherein a first timeslot being selected randomly from the first time range by the first user equipment; the second duration information is configured to indicate a second time range of A-BFT for a second user equipment, wherein a second timeslot being selected randomly from second time range by the second user equipment; the first user equipment and the second user equipment correspond to different communications standards from one another and wherein an access priority of the second user equipment is higher than an access priority of the first user equipment, and the second time range is greater than the first time range; and wherein the receiver is configured to: receive a first-type frame from the first user equipment in the first timeslot randomly selected from the first time range; and receive a second-type frame from the second user equipment in the second timeslot randomly selected from the second time range; wherein a transmission duration of the first-type frame is greater than a transmission duration of the second-type frame. receive a first-type frame from the first user equipment in the first timeslot randomly selected from the first time range; and receive a second-type frame from the second user equipment in the second timeslot randomly selected from the second time range; wherein a transmission duration of the first-type frame is greater than a transmission duration of the second-type frame.