Patent ID: 8339978

Claim:
A wireless communication apparatus, comprising: a reception unit configured to receive packets in multiple formats in which two or more different types of preamble information and intra-header control information are multiplexed; a demodulation and decode unit configured to demodulate and decode the received packets; and a measurement unit configured to measure a sending end time of the reception packets by selectively referring to any one of the intra-header control information on the basis of a transmission mode supported by the demodulation and decode unit, wherein the packets in the multiple formats are Mixed Format (MF) packets in which control information L-SIG compatible to IEEE 802.11a and control information HT-SIG not compatible to IEEE 802.11a which are specified by IEEE 802.11n are multiplexed, in a case where a transmission mode indicated by the control information HT-SIG is not supported by the demodulation and decode unit, the measurement unit measures the sending end time of the reception packets by using RATE information and LENGTH information indicated by the control information L-SIG, and in a case where a transmission mode indicated by the control information HT-SIG is not supported by the demodulation and decode unit, only when the LENGTH information indicated by the control information L-SIG is a value dividable by 3, the measurement unit estimates the sending end time of the reception packets by using the RATE information and the LENGTH information indicated by the control information L-SIG.