| 主权项 |
1. A method of transmitting frames from a first device of a wireless local area network (WLAN) to a second device of the WLAN, the method comprising:
sending, by the first device, a first frame to the second device, the first frame including a first transmission indicator using a frame bit set in a Quality of Service (QoS) control field frame indicating that a service period is to begin at a first certain time; sending, by the first device, a second frame to the second device, the second frame including another first transmission indicator using a frame bit set in the QoS control field frame indicating that the service period is to begin at a second certain time when, after a prescribed time period, an acknowledgement of receipt of the first frame is not received by the first device, the second certain time being later than the first certain time; sending, by the first device, a last frame to the second device, the last frame including a last transmission indicator using another frame bit in the QoS control field; terminating, by the first device, the service period, when an acknowledgment of receipt of the last frame is received; and when an acknowledgement of receipt of the last frame is not received after a prescribed time period, terminating, by the first device, the service period, when a maximum service duration time has expired. |
