Half-duplex user equipment operation in intra-band carrier aggregation sub-band full duplex communications systems

1 . A method of wireless communication performed by a user equipment (UE), comprising:

transmitting a UE capability indication that identifies an intra-band carrier aggregation capability for a half-duplex operation by the UE;

communicating on a sub-band full duplex communication link based at least in part on an evaluation of one or more directional collision handling rules associated with the UE capability indication, and based at least in part on received configuration information,

wherein the configuration information includes:

a common configuration or a dedicated configuration identifying a symbol that is a downlink symbol on a first cell or second cell, or an uplink symbol on the first cell or the second cell; or

information identifying a first downlink control information format to schedule a transmission on the symbol in the first cell and a second downlink control information format to schedule a reception on the symbol in the second cell.

2 . The method of claim 1 , wherein the configuration information includes the common configuration or the dedicated configuration identifying the symbol that is the uplink symbol on the first cell and a downlink control information format.

3 . The method of claim 1 , wherein the configuration information includes the common configuration or the dedicated configuration identifying the symbol that is the downlink symbol on the first cell and a downlink control information format to schedule the uplink symbol for transmission on the second cell.

4 . The method of claim 1 , wherein the configuration information includes information identifying the first downlink control information format to schedule the transmission on the symbol in the first cell and the second downlink control information format to schedule the reception on the symbol in the second cell.

5 . The method of claim 1 , wherein the configuration information includes the common configuration or the dedicated configuration identifying the symbol that is the downlink symbol on the first cell and the uplink symbol on the second cell, or that is the uplink symbol on the first cell and the downlink symbol on the second cell.

6 . The method of claim 1 , wherein the communicating on the sub-band full duplex communication link comprises:

receiving, in the first cell, first downlink control information (DCI) that schedules a first communication;

receiving, in the second cell, second DCI that schedules a second communication; and

transmitting or receiving the first communication or the second communication based at least in part on the one or more directional collision handling rules.

7 . The method of claim 6 , wherein the one or more directional collision handling rules include a directional collision handling rule associated with at least one of:

whether the first cell or the second cell is a reference cell,

an order of reception of the first DCI and the second DCI,

whether the first communication or the second communication is on the reference cell,

respective priorities of scheduled transmission or reception by the first DCI and the second DCI,

a type of duplex mode of the first communication or the second communication,

an order of the first communication and the second communication,

a repetition amount of the first communication or the second communication,

respective priorities of a first carrier associated with the first communication and a second carrier associated with the second communication, or

a slot offset value.

8 . The method of claim 1 , further comprising:

receiving downlink control information (DCI) dynamically scheduling a first communication on the first cell that collides with a semi-statically scheduled second communication on the second cell, and

wherein the one or more directional collision handling rules include a directional collision handling rule associated with at least one of:

prioritizing the first communication scheduled by the DCI,

whether the first communication scheduled by the DCI is associated with a first priority that is higher than a second priority that is associated with the second communication, or

whether the first communication scheduled by the DCI is associated with a reference cell.

9 . The method of claim 1 , further comprising:

receiving configuration information that includes an indication of a first direction of the symbol; and

receiving downlink control information (DCI) that indicates a second direction for the symbol,

wherein the DCI is associated with a higher priority than the configuration information; and

wherein the communicating on the sub-band full duplex communication link comprises:

communicating in the second direction on the sub-band full duplex communication link,

wherein the symbol is a flexible symbol based at least in part on the DCI being associated with the higher priority than the configuration information.

10 . The method of claim 1 , wherein the one or more directional collision handling rules include a directional collision handling rule associated with at least one of:

configuring the symbol as flexible only on a non-reference cell,

configuring the symbol as flexible only on a reference cell, or

configuring the symbol as flexible on the non-reference cell and the reference cell.

11 . A user equipment (UE) for wireless communication, comprising one or more processors, coupled to one or more memories, and configured to cause the UE to:

transmit a UE capability indication that identifies an intra-band carrier aggregation capability for a half-duplex operation by the UE; and

communicate on a sub-band full duplex communication link based at least in part on an evaluation of one or more directional collision handling rules associated with the UE capability indication, and based at least in part on received configuration information,

wherein the configuration information includes:

a common configuration or a dedicated configuration identifying a symbol that is a downlink symbol on a first cell or second cell, or an uplink symbol on the first cell or the second cell; or

information identifying a first downlink control information format to schedule a transmission on the symbol in the first cell and a second downlink control information format to schedule a reception on the symbol in the second cell.

12 . A method of wireless communication performed by a user equipment (UE), comprising:

transmitting a UE capability indication that identifies an intra-band carrier aggregation capability for a half-duplex operation by the UE;

communicating on a sub-band full duplex communication link based at least in part on an evaluation of one or more directional collision handling rules associated with the UE capability indication; and

resolving, using a directional collision handling rule of the one or more directional collision handling rules, a collision between a first downlink control information (DCI) and a second DCI based at least in part on a repetition factor, wherein resolving the collision based at least in part on the repetition factor comprises prioritizing the first DCI over the second DCI based at least in part on the first DCI being scheduled for a larger quantity of repetitions than the second DCI.

13 . The UE of claim 11 , wherein the configuration information includes the common configuration or the dedicated configuration identifying the symbol that is the uplink symbol on the first cell and a downlink control information format.

14 . The UE of claim 11 , wherein the configuration information includes the common configuration or the dedicated configuration identifying the symbol that is the downlink symbol on the first cell and a downlink control information format to schedule the uplink symbol, for transmission on the second cell.

15 . The UE of claim 11 , wherein the configuration information includes information identifying the first downlink control information format to schedule the transmission on the symbol in the first cell and the second downlink control information format to schedule the reception on the symbol in the second cell.

16 . The UE of claim 11 , wherein the configuration information includes the common configuration or the dedicated configuration identifying the symbol that is the downlink symbol on the first cell and the uplink symbol on the second cell, or that is the uplink symbol on the first cell and the downlink symbol on the second cell.

17 . The UE of claim 11 , wherein to communicate on the sub-band full duplex communication link, the one or more processors are configured to cause the UE to:

receive, in the first cell, first downlink control information (DCI) that schedules a first communication;

receive, in the second cell, second DCI that schedules a second communication; and

transmit or receiving the first communication or the second communication based at least in part on the one or more directional collision handling rules.

18 . The UE of claim 17 , wherein the one or more directional collision handling rules include a directional collision handling rule associated with at least one of:

whether the first cell or the second cell is a reference cell,

an order of reception of the first DCI and the second DCI,

whether the first communication or the second communication is on the reference cell,

respective priorities of scheduled transmission or reception by the first DCI and the second DCI,

a type of duplex mode of the first communication or the second communication,

an order of the first communication and the second communication,

a repetition amount of the first communication or the second communication,

respective priorities of a first carrier associated with the first communication and a second carrier associated with the second communication, or

a slot offset value.

19 . The UE of claim 11 , wherein the one or more processors are configured to cause the UE to:

receive downlink control information (DCI) dynamically scheduling a first communication on the first cell that collides with a semi-statically scheduled second communication on the second cell, and

wherein the one or more directional collision handling rules include a directional collision handling rule associated with at least one of:

prioritizing the first communication scheduled by the DCI,

whether the first communication scheduled by the DCI is associated with a first priority that is higher than a second priority that is associated with the second communication, or

whether the first communication scheduled by the DCI is associated with a reference cell.

20 . The UE of claim 11 , wherein the one or more processors are configured to cause the UE to:

receive configuration information that includes an indication of a first direction of the symbol; and

receive downlink control information (DCI) that indicates a second direction for the symbol, wherein the DCI is associated with a higher priority than the configuration information; and

wherein to communicate on the sub-band full duplex communication link, the one or more processors are configured to cause the UE to:

communicate in the second direction on the sub-band full duplex communication link,

wherein the symbol is a flexible symbol based at least in part on the DCI being associated with the higher priority than the configuration information.

21 . The UE of claim 11 , wherein the one or more directional collision handling rules include a directional collision handling rule associated with at least one of:

configuring the symbol as flexible only on a non-reference cell,

configuring the symbol as flexible only on a reference cell, or

configuring the symbol as flexible on the non-reference cell and the reference cell.

22 . A user equipment (UE) for wireless communication, comprising one or more processors, coupled to one or more memories, and configured to cause the UE to:

transmit a UE capability indication that identifies an intra-band carrier aggregation capability for a half-duplex operation by the UE;

communicate on a sub-band full duplex communication link based at least in part on an evaluation of one or more directional collision handling rules associated with the UE capability indication; and

resolve, using a directional collision handling rule of the one or more directional collision handling rules, a collision between a first downlink control information (DCI) and a second DCI based at least in part on a repetition factor, wherein to resolve the collision based at least in part on the repetition factor, the one or more processors are configured to cause the UE to prioritize the first DCI over the second DCI based at least in part on the first DCI being scheduled for a larger quantity of repetitions than the second DCI.