Wireless communication apparatus and wireless communication method

摘要

[Object] To prevent or reduce the degradation in transmission characteristics caused by fast fading (fluorescent lamp interference) to achieve optimized throughput.;[Solution] A process for detecting fast fading (fluorescent lamp interference) is performed (ST2). Fast fading is detected by, for example, detecting a variable light source whose frequency is twice the frequency of an alternating current power supply. When fast fading is detected, a frame length update process is performed (ST3, ST4). In the case of “subject transmission” in which the subject apparatus is the transmitter of a data frame, the setting of the maximum number of aggregations in frame aggregation (A-MPDU, A-MSDU) is changed to “the recommended maximum number of aggregations”. “The recommended maximum number of aggregations” is set in advance so that the UDP throughput can be maximized under the conditions where fast fading has occurred. In the case of “subject reception” in which the subject apparatus is the receiver of a data frame, the subject apparatus sends a request message for limiting the maximum transmission length to the communication counterpart apparatus.

主权项

1. A wireless communication apparatus comprising:
a data transmitter that wirelessly transmits a data frame to a communication counterpart apparatus, the data frame being configured by combining a plurality of packets in accordance with A-MPDU (Aggregate MAC Protocol Data Unit) type of packet aggregation or A-MSDU (Aggregate MAC Service Data Unit) type of packet aggregation; and a data frame limiter that
(i) detects whether fast fading is present, wherein the fast fading is detected based on measured maximum throughput with respect to maximum transmission length receivable at the communication counterpart apparatus, the measured maximum throughput being obtained by transmitting a test data frame and sequentially increasing a maximum number of aggregations until the maximum transmission length receivable at the communication counterpart apparatus is determined, and wherein detecting whether fast fading is present occurs when a subsequent measured throughput is less than the measured maximum throughput, and(ii) in the event a detection result thereof indicates that the fast fading is present, performs a frame length update process in which a maximum number of packets of the data frame transmitted by the data transmitter is changed to a recommended maximum number, and in the event the detection result thereof indicates that the fast fading is not present, does not perform the frame length update process.