Null data packet (NDP) ranging measurement feedback

A communication device, comprising:

• a wireless network interface device associated with an access point, the wireless network interface comprising one or more integrated circuit (IC) devices configured to:
• determine which one or more types of feedback information, from among a plurality of types of feedback information associated with range measurements, the access point is to provide to a first client station in a range measurement session, including determining whether the access point is to provide angular information associated with range measurements to the first client station in a range measurement session,
• control the wireless network interface to transmit one or more indications of the determined one or more types of feedback information that the access point is to provide to the first client station in the range measurement session, the one or more indications including a first indication of whether the access point is to provide the angular information to the first client station in the range measurement session,
• control the wireless network interface to transmit a first downlink physical layer (PHY) data unit with one or more first trigger frames that are configured to prompt the first client station and one or more second client stations to transmit respective first null data packets (NDPs) a short interface space (SIFS) after an end of reception of the first downlink PHY data unit,
• receive a first uplink PHY transmission from the first client station and the one or more second client stations, the first uplink PHY transmission including the first NDPs prompted by the one or more first trigger frames,
• when the access point is to provide angular information associated with range measurements to the first client station, determine angular information corresponding to receiving the respective first NDP from the first client station,
• control the wireless network interface to transmit a second downlink PHY data unit SIFS after an end of reception of the first uplink PHY transmission, wherein the second downlink PHY data unit includes one or more null data packet announcement (NDPA) frames that indicate that the access point will transmit a third downlink PHY data unit SIFS after an end of transmission of the second downlink PHY data unit, the third downlink PHY data unit having one or more second NDPs,
• control the wireless network interface to transmit the third downlink PHY data unit SIFS after the end of transmission of the second downlink PHY data unit,
• generate respective downlink feedback frames for the first client station and the one or more second client stations, wherein a first downlink feedback frame, among the respective downlink feedback frames, for the first client station includes the determined one or more types of feedback information corresponding to the respective first NDP from the first client station and the one or more second NDPs, wherein when the access point is to provide angular information associated with range measurements to the first client station, the first downlink feedback frame is generated to include the angular information corresponding to receiving the respective first NDP from the first client station, and when the access point is not to provide angular information associated with range measurements to the first client station, the first downlink feedback frame is generated to omit the angular information corresponding to receiving the respective NDP from the first client station, and
• control the wireless network interface to transmit a fourth downlink PHY data unit to the first client station and the one or more second client stations SIFS after an end of transmission of the third downlink PHY data unit, the fourth downlink PHY transmission including the downlink feedback frames.