Techniques for full-duplex channel access in shared radio frequency spectrum

1 . A network entity, comprising:

one or more memories storing processor-executable code; and

one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to:

transmit, responsive to a listen-before-talk procedure indicating a shared radio frequency spectrum band is available for a channel occupancy time, a first uplink dynamic grant for a first uplink transmission to be transmitted contemporaneously with a downlink transmission from the network entity to a downlink user equipment (UE), wherein the first uplink dynamic grant is transmitted to an uplink UE and indicates uplink transmission resources in a first portion of the shared radio frequency spectrum band;

monitor for uplink signaling indicating a successful listen-before-talk procedure associated with the uplink UE;

transmit a downlink dynamic grant for the downlink transmission to the downlink UE responsive to monitoring for the uplink signaling indicating the successful listen-before-talk procedure associated with the uplink UE, wherein the downlink dynamic grant indicates downlink transmission resources in a second portion of the shared radio frequency spectrum band; and

monitor for the first uplink transmission using the first portion of the shared radio frequency spectrum band while transmitting the downlink transmission to the downlink UE using the second portion of the shared radio frequency spectrum band.

2 . The network entity of claim 1 , wherein:

communications with the downlink UE and the uplink UE are performed according to a full-duplex communication procedure at the network entity, and

the first portion of the shared radio frequency spectrum band and the second portion of the shared radio frequency spectrum band occupy non-overlapping frequency resources of the shared radio frequency spectrum band, partially overlapping frequency resources of the shared radio frequency spectrum band, or fully overlapping frequency resources of the shared radio frequency spectrum band.

3 . The network entity of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to:

receive, from the uplink UE, an indication that the first uplink transmission will be transmitted by the UE.

4 . The network entity of claim 1 , wherein the first uplink dynamic grant is transmitted at a first time, and, to indicate the first uplink transmission is to start at a second time, the one or more processors are individually or collectively further operable to execute the code to cause the network entity to:

transmit, responsive to transmission of the first uplink dynamic grant, a downlink channel occupancy signal, the downlink channel occupancy signal starting upon conclusion of the transmission of the first uplink dynamic grant or starting upon expiration of a maximum gap that other devices may occupy on the shared radio frequency spectrum band, and ending at the second time.

5 . The network entity of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to:

monitor, prior to transmitting the downlink dynamic grant, for an uplink channel occupancy signal from the uplink UE.

6 . The network entity of claim 5 , wherein, to transmit the downlink dynamic grant, the one or more processors are individually or collectively operable to execute the code to cause the network entity to:

transmit, to a first downlink UE responsive to detecting the uplink channel occupancy signal, a first downlink dynamic grant for a first downlink transmission to the first downlink UE.

7 . The network entity of claim 5 , wherein the uplink UE is a first uplink UE and the uplink transmission resources are first uplink transmission resources, and the one or more processors are individually or collectively further operable to execute the code to cause the network entity to:

transmit, to a second uplink UE responsive to a failure to detect the uplink channel occupancy signal, a second uplink dynamic grant for a second uplink transmission of the second uplink UE, the second uplink dynamic grant transmitted subsequent to a time at which the uplink channel occupancy signal is configured to be transmitted by the first uplink UE, and wherein the second uplink dynamic grant indicates second uplink transmission resources that start subsequent to the first uplink transmission resources.

8 . The network entity of claim 5 , wherein, to transmit the downlink dynamic grant, the one or more processors are individually or collectively operable to execute the code to cause the network entity to:

transmit, to a first downlink UE responsive to a failure to detect the uplink channel occupancy signal, a first downlink dynamic grant for a first downlink transmission to the first downlink UE; and

disable one or more receive components associated with receiving the first uplink transmission.

9 . The network entity of claim 5 , wherein, to transmit the downlink dynamic grant, the one or more processors are individually or collectively operable to execute the code to cause the network entity to:

transmit, to a first downlink UE responsive to a failure to detect the uplink channel occupancy signal, a first downlink dynamic grant for a first downlink transmission to the first downlink UE, the first downlink dynamic grant indicating resources for both the first portion of the shared radio frequency spectrum band and the second portion of the shared radio frequency spectrum band.

10 . The network entity of claim 5 , wherein the uplink channel occupancy signal is a preconfigured signal, is configured by radio resource control (RRC) signaling, is configured in an uplink scheduling control information communication, or any combinations thereof.

11 . The network entity of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to:

transmit, subsequent to transmitting the first uplink dynamic grant and responsive to a successful listen-before-talk procedure for the second portion of the shared radio frequency spectrum band, a downlink channel reservation signal that indicates the network entity will use the second portion of the shared radio frequency spectrum band to transmit the downlink transmission.

12 . The network entity of claim 11 , wherein the downlink channel reservation signal is a clear-to-send (CTS) signal that is broadcast using the second portion of the shared radio frequency spectrum band.

13 . The network entity of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to:

monitor, prior to transmitting the downlink dynamic grant, for an uplink channel reservation signal from the uplink UE that indicates the UE will use the first portion of the shared radio frequency spectrum band to transmit the first uplink transmission, and wherein the monitoring for the first uplink transmission is responsive to the uplink channel reservation signal.

14 . The network entity of claim 13 , wherein the uplink channel reservation signal is received in a slot after transmission of the first uplink dynamic grant.

15 . The network entity of claim 13 , wherein the uplink UE is a first uplink UE and the uplink transmission resources are first uplink transmission resources, and the one or more processors are individually or collectively further operable to execute the code to cause the network entity to:

transmit, to a second uplink UE responsive to a failure to detect the uplink channel reservation signal, a second uplink dynamic grant for a second uplink transmission of the second uplink UE, the second uplink dynamic grant transmitted subsequent to a time at which the uplink channel reservation signal is configured to be transmitted by the first uplink UE, and wherein the second uplink dynamic grant indicates second uplink transmission resources that start subsequent to the first uplink transmission resources.

16 . The network entity of claim 13 , wherein, to transmit the downlink dynamic grant, the one or more processors are individually or collectively operable to execute the code to cause the network entity to:

transmit, to a first downlink UE responsive to a failure to detect the uplink channel reservation signal, a first downlink dynamic grant for a first downlink transmission to the first downlink UE; and

disable one or more receive components associated with receiving the first uplink transmission.

17 . The network entity of claim 13 , wherein, to transmit the downlink dynamic grant, the one or more processors are individually or collectively operable to execute the code to cause the network entity to:

transmit, to a first downlink UE responsive to a failure to detect the uplink channel reservation signal, a first downlink dynamic grant for a first downlink transmission to the first downlink UE, the first downlink dynamic grant indicating resources for both the first portion of the shared radio frequency spectrum band and the second portion of the shared radio frequency spectrum band.

18 . A user equipment (UE), comprising:

one or more memories storing processor-executable code; and

one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:

receive, from a network entity and at a first time, a dynamic grant for an uplink transmission to be transmitted contemporaneously with a downlink transmission from the network entity, the dynamic grant indicating transmission resources in a first portion of a shared radio frequency spectrum band for the uplink transmission, and the downlink transmission from the network entity uses a second portion of the shared radio frequency spectrum band;

perform a listen-before-talk procedure for the first portion of the shared radio frequency spectrum band;

transmit, responsive to the listen-before-talk procedure indicating that the first portion of the shared radio frequency spectrum band is available for the uplink transmission, uplink signaling that occupies the shared radio frequency spectrum band starting upon conclusion of the listen-before-talk procedure and ending at a second time; and

transmit the uplink transmission at the second time based at least in part on the listen-before-talk procedure indicating whether the first portion of the shared radio frequency spectrum band is available for the uplink transmission.

19 . The UE of claim 18 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:

transmit, responsive to the listen-before-talk procedure indicating that the first portion of the shared radio frequency spectrum band is available for the uplink transmission, an indication to the network entity that the uplink transmission will be transmitted by the UE.

20 . The UE of claim 18 , wherein the dynamic grant for the uplink transmission is received at the first time, and, to indicate the uplink transmission is to start at the second time, the one or more processors are individually or collectively further operable to execute the code to cause the UE to:

transmit, responsive to the listen-before-talk procedure indicating that the first portion of the shared radio frequency spectrum band is available for the uplink transmission, a channel occupancy signal starting upon conclusion of the listen-before-talk procedure and ending at the second time, wherein the channel occupancy signal comprises a sounding reference signal.

21 . The UE of claim 18 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:

transmit, responsive to the listen-before-talk procedure indicating that the first portion of the shared radio frequency spectrum band is available for the uplink transmission, a channel reservation indication that the UE will use the first portion of the shared radio frequency spectrum band to transmit the uplink transmission.

22 . The UE of claim 18 , wherein the dynamic grant indicates that the uplink transmission is to be started using one or more parameters associated with a full-duplex communication procedure.

23 . The UE of claim 22 , wherein the dynamic grant includes a beam indication for a transmission beam for the uplink transmission that is associated with the full-duplex communication procedure.

24 . A method for wireless communication at a network entity, comprising:

transmitting, responsive to a listen-before-talk procedure indicating a shared radio frequency spectrum band is available for a channel occupancy time, a first uplink dynamic grant for a first uplink transmission to be transmitted contemporaneously with a downlink transmission from the network entity to a downlink user equipment (UE), wherein the first uplink dynamic grant is transmitted to an uplink UE and indicates uplink transmission resources in a first portion of the shared radio frequency spectrum band;

monitor for uplink signaling indicating a successful listen-before-talk procedure associated with the uplink UE;

transmitting a downlink dynamic grant for the downlink transmission to the downlink UE responsive to monitoring for the uplink signaling indicating the successful listen-before-talk procedure associated with the uplink UE, wherein the downlink dynamic grant indicates downlink transmission resources in a second portion of the shared radio frequency spectrum band; and

monitoring for the first uplink transmission using the first portion of the shared radio frequency spectrum band while transmitting the downlink transmission to the downlink UE using the second portion of the shared radio frequency spectrum band.

25 . The method of claim 24 , further comprising:

monitoring, prior to transmitting the downlink dynamic grant, for an uplink channel occupancy signal from the uplink UE.

26 . The method of claim 25 , wherein the uplink UE is a first uplink UE and the uplink transmission resources are first uplink transmission resources, and the method further comprises:

transmitting, to a second uplink UE responsive to a failure to detect the uplink channel occupancy signal, a second uplink dynamic grant for a second uplink transmission of the second uplink UE, the second uplink dynamic grant transmitted subsequent to a time at which the uplink channel occupancy signal is configured to be transmitted by the first uplink UE, and wherein the second uplink dynamic grant indicates second uplink transmission resources that start subsequent to the first uplink transmission resources.

27 . A method for wireless communication at a user equipment (UE), comprising:

receiving, from a network entity and at a first time, a dynamic grant for an uplink transmission to be transmitted contemporaneously with a downlink transmission from the network entity, the dynamic grant indicating transmission resources in a first portion of a shared radio frequency spectrum band for the uplink transmission, and the downlink transmission from the network entity uses a second portion of the shared radio frequency spectrum band;

performing a listen-before-talk procedure for the first portion of the shared radio frequency spectrum band;

transmit, responsive to the listen-before-talk procedure indicating that the first portion of the shared radio frequency spectrum band is available for the uplink transmission, uplink signaling that occupies the shared radio frequency spectrum band starting upon conclusion of the listen-before-talk procedure and ending at a second time; and

transmitting the uplink transmission at the second time based at least in part on the listen-before-talk procedure indicating whether the first portion of the shared radio frequency spectrum band is available for the uplink transmission.

28 . The method of claim 27 , further comprising:

transmitting, responsive to the listen-before-talk procedure indicating that the first portion of the shared radio frequency spectrum band is available for the uplink transmission, an indication to the network entity that the uplink transmission will be transmitted by the UE.

29 . The method of claim 27 , wherein the dynamic grant for the uplink transmission is received at the first time and indicates the uplink transmission is to start at the second time, and wherein the method further comprises:

transmitting, responsive to the listen-before-talk procedure indicating that the first portion of the shared radio frequency spectrum band is available for the uplink transmission, a channel occupancy signal starting upon conclusion of the listen-before-talk procedure and ending at the second time, wherein the channel occupancy signal comprises a sounding reference signal.