(in English) |
In recent years, the number of electronic devices with wireless LAN such as PCs and smartphones has increased. With the increase in electronic devices with wireless LAN, the opportunity for multiple wireless LAN stations (STAs) to connect to a single access point (AP) may increase. In IEEE 802.11 wireless LANs, when several different data rates of the stations in the same wireless networks, each station’s throughput becomes even and this network throughput deteriorates. This problem called performance anomaly. In IEEE 802.11, the distributed coordination function (DCF) method is used as a media access control. However, in the conventional DCF system, since all STAs belonging to the same AP are evenly given a transmission opportunity, STAs accessed at low data rates occupy the wireless channel in time, and the performance of stations accessed at high data rates deteriorates greatly. One of the solutions to this problem is to increase the transmission opportunity of STAs communicating at high data rates and to equalize the channel occupancy in time. Therefore, as a method to increase the transmission opportunity, we aim to solve this problem using a success prioritized DCF that gives priority access to STAs that have succeeded in data frame transmission with a certain probability. |