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(in English) Wireless local area networks (wireless LANs) based on IEEE 802.11 standard have been widely used. The wireless LAN usually uses CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) for the media access control. However, in CSMA/CA, if the number of wireless node increases, the back off time which is yielded by the initial CW (Contention Window) tends to conflict among some wireless nodes. This sometimes causes the degradation of the total throughput. In this study, in order to improve the total throughput, we propose a new media access control mechanism based on synchronization phenomena of the coupled oscillators. Moreover, this paper shows that the proposed method improves the total throughput and decreases the probability of the data frame collision drastically by comparing with the original CSMA/CA.