Providing coexistence features for cellular communication in unlicensed spectrum may be useful to improve quality of service obtained by wireless devices performing cellular, Wi-Fi, and/or other forms of communication in unlicensed spectrum, and/or may help improve cell capacity for carriers utilizing unlicensed spectrum. For example, the use of listen-before-talk (LBT) and other such collision avoidance techniques may substantially reduce the likelihood of collisions on a wireless medium. However, at least in some instances, it may still be possible for collisions to occur, e.g., even if all parties on the medium are contending for medium access using clear channel assessment and LBT procedures. For example, if multiple devices complete their LBT procedures in sufficiently close temporal proximity, both may begin transmitting without realizing that another transmission is simultaneously occurring. In this case the transmissions may cause interference to each other, which could potentially result in receivers being unable to receive and/or decode one or both transmissions.

In the case of cellular use of unlicensed spectrum, it may be the case that data communication is constrained to begin at cellular slot boundaries, or possibly at one or more cellular slot subdivisions (e.g., half-slot, quarter-slot, etc.), which may not necessarily be synchronized with when the medium becomes available. Accordingly, as previously noted herein, in some instances a cellular base station that has successfully performed a LBT procedure may transmit a reservation signal to reserve the medium (e.g., to prevent other devices performing carrier sensing from determining that the medium is available) until the next available cellular slot (or half-slot, quarter-slot, etc.).