Methods, devices and systems for improving transmission protection rates for radio circuits that coexist with WLAN circuits

A device, comprising:

• IEEE 802.11 compatible (WLAN) circuits, including a controller section configured to
• determine an estimated duration for future communications of a coexisting wireless circuit (coex communications), the coex communications being compatible with a second communications protocol different than WLAN,
• generate a first clear-to-send-to-self (CTS-to-self) data having a first duration equivalent to the estimated duration for the future coex communications,
• in response to an actual coex communication start signal provided at an actual start for the coex communications,
• upon determining that an actual duration of the coex communication extends beyond the first duration, generate second CTS-to-self data having a second duration that extends beyond the first duration sufficient to cover the actual duration;
• media access control (MAC) circuits configured to create at least the first and second CTS-to-self frames from first and second CTS-to-self data;
• and
• physical layer (PHY) circuits configured to receive WLAN frames and transmit WLAN frames, including transmitting the first and second CTS-to-self frames prior to the coex communications.