Methods of ranging for next generation vehicle-to-everything (NGV) systems
Embodiments of an access point (AP), station (STA) and method of communication are generally described herein. In a null data packet (NDP) based ranging procedure between a responding STA and an initiating STA that is unassociated with the responding STA, the responding STA may: transmit a broadcast frame that indicates one or more ranging parameters; receive, from the initiating STA, an NDP announcement (NDPA) frame that indicates transmission of a first NDP from the initiating STA; detect the first NDP from the initiating STA; transmit a second NDP for transmission to the initiating STA; and transmit, to the initiating STA, a location measurement report (LMR) that indicates: a reception time of the first NDP at the responding STA, and a transmission time of the second NDP at the responding STA.
1. An apparatus of a station (STA), the STA configurable to operate as a responding STA in a null data packet (NDP) based ranging procedure with an initiating STA, wherein the apparatus comprises: memory; and processing circuitry,
wherein when the STA operates as the responding STA, as part of the NDP based ranging procedure, the processing circuitry is configured to:
encode, for transmission, a broadcast frame that indicates one or more ranging parameters, the ranging parameters comprising at least one of a bandwidth and frequency band;
detect the first NDP from the initiating STA;
encode a second NDP for transmission to the initiating STA; and
encode, for transmission to the initiating STA, a first location measurement report (LMR) that indicates: a reception time of the first NDP at the responding STA, and a transmission time of the second NDP at the responding STA,
wherein the first and second NDP comprise a legacy preamble followed by an Next Generation Vehicle-to-Everything (NGV) preamble, the legacy preamble comprising a legacy short training field (L-STF) and a legacy long training field (L-LTF) followed by a legacy signal field (L-SIG), the NGV preamble comprising an NGV signal field (NGV-SIG) followed by an NGV-STF and an NGV-LTF,
wherein when the first NDP is detected without a prior announcement by an NDP announcement (NDPA) frame, the NGV-SIG of the first NDP includes an indicator to indicate that the first NDP is for ranging, and
wherein in response to the indicator, the processing circuitry is configured to buffer channel estimates determined from the NGV-LTF for subsequent use in the NDP based ranging procedure.
2. The apparatus according to claim 1 , wherein when the STA operates as the responding STA, the processing circuitry is further configured to:
decode, from the initiating STA, a second LMR that indicates: a transmission time of the first NDP at the initiating STA, and a reception time of the second NDP at the initiating STA; and
determine a range between the initiating STA and the responding STA, the range determined based at least partly on one or more of: the reception time of the first NDP at the responding STA, the transmission time of the second NDP at the responding STA, the transmission time of the first NDP at the initiating STA, and the reception time of the second NDP at the initiating STA.
3. The apparatus according to claim 1 , wherein the ranging parameters include one or more of:
a number of antennas of the responding STA,
a number of spatial time streams supported for transmission by the responding STA,
a number of spatial time streams supported for reception by the responding STA, and
a number of antennas supported for reception by the responding STA.
4. The apparatus according to claim 1 , wherein the ranging parameters include one or more of:
a number of repetitions supported by the responding STA,
a feedback type for LMRs, wherein the feedback type is immediate or delayed,
a maximum time interval between two consecutive ranging measurement sequences at the responding STA, and
a minimum time interval between two consecutive ranging measurement sequences at the responding STA.
5. The apparatus according to claim 1 , wherein the ranging parameters include one or more of:
a bandwidth used for ranging measurements at the responding STA, and
a frequency band for ranging measurements at the responding STA.
6. The apparatus according to claim 1 , wherein the processing circuitry is further configured to:
encode signaling for transmission to the initiating STA, wherein the signaling indicates a request to receive a ranging measurement report from the initiating STA.
7. The apparatus according to claim 1 , wherein the processing circuitry is further configured to perform the NDP based ranging procedure without negotiation between the responding STA and the originating STA.
8. The apparatus according to claim 1 , wherein the processing circuitry is further configured to encode the broadcast frame to include a medium access control (MAC) address of the responding STA.
9. The apparatus according to claim 1 , wherein the responding STA is arranged to operate in accordance with a Next Generation Vehicular (NGV) protocol.
10. The apparatus according to claim 1 , wherein:
the processing circuitry includes a baseband processor to encode the broadcast frame,
the apparatus further comprises a transceiver to transmit the broadcast frame, and
the memory is configured to store at least a portion of the broadcast frame.