Abstract: This disclosure provides systems, methods and apparatuses, including computer programs encoded on computer storage media, for ranging procedures performed using antenna switching. In one aspect, a device initiating a ranging procedure may transmit a ranging request, which may include antenna switching capabilities of the initiating device, a request for antenna switching by a responding device during the ranging procedure, or both. Ranging signaling may be communicated between the initiating device and the responding device using different transmit antennas, receive antennas, or both. In some implementations, ranging messages transmitted by the responding device may include transmit antenna indices used for transmission of different ranging messages, and receive antenna indices used for reception of different ranging response messages.

Abstract: In some implementations, an apparatus transmits information indicating a modulation and coding scheme (MCS) table for transmitting non-legacy acknowledgement (ACK) frames during a ranging operation to a responder device, receives a ranging frame including an indication of whether the responder device is capable of supporting the indicated MCS table, and transmits to the responder device an ACK frame using an MCS that is based on the capability of the responder device to support the MCS table. In other implementations, the apparatus receives from an initiator device information indicating an MCS table for transmitting non-legacy ACK frames during the ranging operation, transmits a ranging frame including an indication of whether the apparatus is capable of supporting the indicated MCS table, and receives from the initiator device an ACK frame transmitted using an MCS that is based on the capability of the apparatus to support the MCS table.

Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for detecting motion using wireless local area network (WLAN) communications. A first WLAN device having multiple antennas (radios) may determine a metric based on differences in spatial signal processing characteristics between the multiple antennas. By comparing changes in the metric over a plurality of wireless signals over time, the first WLAN device may detect motion in the environment near the first WLAN device. The spatial signal processing characteristics may be based on received WLAN communications from a second WLAN device, based on beamforming feedback from the second WLAN device, or based on wireless signal reflections detected by the first WLAN device. Various techniques may be used to adjust or mitigate random phase differences between two antennas on some tones. Motion detection based on WLAN communications may trigger activities or notifications by the first WLAN device.

Abstract: This disclosure provides systems, methods and apparatuses, including computer programs encoded on computer storage media, for ranging procedures performed using antenna switching. In one aspect, a device initiating a ranging procedure may transmit a ranging request, which may include antenna switching capabilities of the initiating device, a request for antenna switching by a responding device during the ranging procedure, or both. Ranging signaling may be communicated between the initiating device and the responding device using different transmit antennas, receive antennas, or both. In some implementations, ranging messages transmitted by the responding device may include transmit antenna indices used for transmission of different ranging messages, and receive antenna indices used for reception of different ranging response messages.