This means that control response frames may be sent using different rate even though the ConstantRateWifiManager is used. The ControlMode attribute of the ConstantRateWifiManager is used for RTS frames only. The rate of CTS and ACK frames are selected according to the 802.11 standard. However, users can still manually add WifiMode to the basic rate set that will allow control response frames to be sent at other rates. Please consult the project wiki on how to do this.
Available attributes:
• DataMode (default WifiMode::OfdmRate6Mbps): specify a mode for all non-unicast packets
• ControlMode (default WifiMode::OfdmRate6Mbps): specify a mode for all ‘request’ control packets
图一 RTS/CTS模式
图二 RTS threshold
