Beam-specific timing advance for timing response transmission for round-trip-time estimation

A method for determining a beam-specific timing advance for Round-Trip Time (RTT) estimation, comprising:

• transmitting, to a first node by a second node, a plurality of beams on a wireless channel;
• receiving, at the second node from the first node, a timing response for a first beam of the plurality of beams;
• determining, by the second node, an identifier of the first beam, a timing statistic for the timing response, and a time at which the second node transmitted the first beam, wherein the timing statistic for the timing response comprises a timing statistic other than a time of arrival of the timing response;
• and
• determining, by the second node, an RTT between the second node and the first node based on the timing statistic for the timing response, the time at which the second node transmitted the first beam, and a predetermined time delay.

An apparatus for determining a beam-specific timing advance for Round-Trip Time (RTT) estimation, comprising:

• a transceiver of a first node configured to receive a plurality of beams transmitted by a second node on a wireless channel;
• and
• at least one processor of the first node configured to:
• select a first beam from the plurality of beams for transmitting a timing response;
• determine a timing statistic, a timing difference, and a timing advance for the first beam, wherein the timing difference comprises a difference between the timing statistic and an earliest time of arrival of the plurality of beams, and wherein the timing advance comprises a multiple of the timing difference;
• and
• cause the transceiver to transmit the timing response for the first beam to the second node on the wireless channel, wherein the first node transmits the timing response after a time delay from the timing statistic of the first beam, wherein the time delay comprises a difference between a predetermined time delay and the timing advance.

An apparatus for determining a beam-specific timing advance for Round-Trip Time (RTT) estimation, comprising:

• a transceiver of a second node configured to:
• transmit, to a first node, a plurality of beams on a wireless channel;
• and
• receive, from the first node, a timing response for a first beam of the plurality of beams;
• and
• at least one processor of the second node configured to:
• determine an identifier of the first beam, a timing statistic for the timing response, and a time at which the second node transmitted the first beam, wherein the timing statistic for the timing response comprises a timing statistic other than a time of arrival of the timing response;
• and
• determine an RTT between the second node and the first node based on the timing statistic for the timing response, the time at which the second node transmitted the first beam, and a predetermined time delay.