Round-trip time signaling
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first wireless node may receive, from a second wireless node, a round-trip time timing advance indicator, wherein the round-trip time timing advance indicator is different from a timing advance indicator used for an uplink transmission timing advance message. In some aspects, the first wireless node may synchronize a timing configuration of the first wireless node to at least one of the second wireless node or a third wireless node based at least in part on the round-trip time timing advance indicator. Numerous other aspects are provided.
1. A method of wireless communication performed by a first wireless node, comprising:
receiving, by the first wireless node, a timing advance indicator;
receiving, by the first wireless node and from a second wireless node, a round-trip time timing advance indicator, that is a timing offset;
adjusting, by the first wireless node, an uplink transmission timing based on the timing advance indicator offset by the round-trip time timing advance indicator; and
aligning, by the first wireless node, uplink reception timing based on the uplink transmission timing.
2. The method of claim 1 , wherein the round-trip time timing advance indicator is independent from the timing advance indicator.
3. The method of claim 1 , wherein, relative to the timing advance indicator, the round-trip time timing advance indicator is associated with at least one of:
a different quantity of bits,
a reduced separation time between round-trip time timing advance indicators,
a reduced threshold transmission timing error, or
a reduced threshold timing advance error.
4. The method of claim 1 , wherein the round-trip time timing advance indicator is received in connection with an uplink reference signal or a downlink reference signal transmitted by the first wireless node.
5. The method of claim 1 , further comprising:
determining a round-trip time estimation based at least in part on the round-trip time timing advance indicator.
6. The method of claim 1 , wherein the round-trip time timing advance indicator is received in connection with a request for the round-trip time timing advance indicator and using at least one of:
a random access channel message,
a contention free random access channel message,
a physical uplink control channel, or
a media access control control element of a physical uplink shared channel.
7. The method of claim 1 , further comprising:
determining a round-trip time estimation based at least in part on a downlink reference signal.
8. The method of claim 7 , wherein a timing to receive the downlink reference signal is different from a timing reference used to receive other downlink signals from the second wireless node.
9. The method of claim 7 , wherein the downlink reference signal is a wideband downlink reference signal or is associated with a threshold periodicity.
10. The method of claim 7 , further comprising:
reporting the round-trip time estimation to the second wireless node to enable the second wireless node to configure another timing configuration of the second wireless node.
11. The method of claim 10 , wherein the round-trip time estimation is reported through a media access control (MAC) control element (CE) message.
12. The method of claim 10 , wherein the round-trip time estimation is reported in connection with a request from the second wireless node.
13. A first wireless node for wireless communication, comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
receive a timing advance indicator;
receive, from a second wireless node, a round-trip time timing advance indicator that is a timing offset;
adjust an uplink transmission timing based on the timing advance indicator offset by the round-trip time timing advance indicator; and
align uplink reception timing based on the uplink transmission timing.
14. The first wireless node of claim 13 , wherein the round-trip time timing advance indicator is independent from the timing advance indicator.
15. The first wireless node of claim 13 , wherein, relative to the timing advance indicator, the round-trip time timing advance indicator is associated with at least one of:
a different quantity of bits,
a reduced separation time between round-trip time timing advance indicators,
a reduced threshold transmission timing error, or
a reduced threshold timing advance error.
16. The first wireless node of claim 13 , wherein the round-trip time timing advance indicator is received in connection with an uplink reference signal or a downlink reference signal transmitted by the first wireless node.
17. The first wireless node of claim 13 , wherein the one or more processors are further configured to:
determine a round-trip time estimation based at least in part on the round-trip time timing advance indicator.
18. The first wireless node of claim 13 , wherein the round-trip time timing advance indicator is received in connection with a request for the round-trip time timing advance indicator and using at least one of:
a random access channel message,
a contention free random access channel message,
a physical uplink control channel, or
a media access control control element of a physical uplink shared channel.
19. The first wireless node of claim 13 , wherein the one or more processors are further configured to:
determine a round-trip time estimation based at least in part on a downlink reference signal.
20. The first wireless node of claim 19 , wherein the one or more processors are further configured to:
report the round-trip time estimation to the second wireless node to enable the second wireless node to configure another timing configuration of the second wireless node.