Default quasi-colocation for single downlink control information-based multiple transmission reception points
Methods, systems, and devices for wireless communications are described. A communication device, which may be otherwise known as user equipment (UE) may receive a downlink control information (DCI) on a physical downlink control channel (PDCCH). The DCI may include one or more of an indication of a set of transmission configuration indicator (TCI) states related to a physical downlink shared channel (PDSCH), one or more receive beams associated with the set of TCI states, or a physical downlink shared channel (PDSCH) scheme. The UE may decode the DCI and may determine a temporal period associated with the indication of the set of TCI states. The UE may receive, based on the temporal period, the PDSCH according to one or more of the set of TCI states, the one or more receive beams associated with the set of TCI states, the PDSCH scheme, or one or more default receive beams.
1 . An apparatus for wireless communication, comprising:
one or more processors,
one or more memories coupled with the one or more processors; and
instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to:
monitor one or more control resource sets within an active bandwidth part associated with a serving cell;
identify a first default receive beam of a set of default receive beams based at least in part on a control resource set identifier, wherein the control resource set identifier is based at least in part on a latest symbol or a latest slot that a control resource set is monitored within the active bandwidth part associated with the serving cell;
receive an indication of a second default receive beam of the set of default receive beams;
determine the second default receive beam based at least in part on the indication; and
receive one or more data samples jointly for physical downlink shared channels over the first default receive beam and the second default receive beam.
2 . The apparatus of claim 1 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
determine the second default receive beam of the set of default receive beams based at least in part on a first transmission configuration indicator state associated with the first default receive beam that is paired with a second transmission configuration indicator state associated with the second default receive beam.
3 . The apparatus of claim 1 , wherein
the control resource set identifier is a lowest control resource set identifier in the latest symbol or the latest slot that the control resource set is monitored within the active bandwidth part associated with the serving cell.
4 . The apparatus of claim 1 , wherein the first default receive beam of the set of default receive beams is different from the second default receive beam of the set of default receive beams over one or more periods.
5 . The apparatus of claim 4 , wherein the one or more periods relate to one or more transmission time intervals comprising one or more symbols, one or more mini-slots, one or more slots, or a combination thereof.
6 . An apparatus for wireless communication, comprising:
one or more processors,
one or more memories coupled with the one or more processors; and
instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to:
monitor one or more control resource sets within an active bandwidth part associated with a serving cell;
identify a first default receive beam of a set of default receive beams based at least in part on a first control resource set identifier, wherein the first control resource set identifier is based at least in part on a latest symbol or a latest slot that a control resource set is monitored within the active bandwidth part associated with the serving cell;
determine a second default receive beam of the set of default receive beams based at least in part on a second control resource set identifier; and
receive one or more data samples jointly for physical downlink shared channels over the first default receive beam and the second default receive beam.
7 . The apparatus of claim 6 , wherein the first control resource set identifier is a first lowest control resource set identifier in a latest symbol or a latest slot that a control resource set is monitored within an active bandwidth part associated with a serving cell.
8 . The apparatus of claim 7 , wherein the second control resource set identifier is a second lowest control resource set identifier in the latest symbol or the latest slot that the control resource set is monitored within the active bandwidth part associated with the serving cell.
9 . The apparatus of claim 6 , wherein the first control resource set identifier is different from the second control resource set identifier.
10 . The apparatus of claim 6 , wherein the first control resource set identifier corresponds to a first transmission configuration indicator state.
11 . The apparatus of claim 10 , wherein the second control resource set identifier corresponds to a second transmission configuration indicator state different from the first transmission configuration indicator state.
12 . The apparatus of claim 6 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
receive control signaling comprising an indication of a pair of default receive beams corresponding to a transmission configuration indicator state pair, wherein the set of default receive beams includes the pair of default receive beams.
13 . The apparatus of claim 12 , wherein the control signaling comprises radio resource control signaling.
14 . The apparatus of claim 12 , wherein the control signaling comprises medium access control-control element signaling.
15 . A method for wireless communication, comprising:
monitoring one or more control resource sets within an active bandwidth part associated with a serving cell;
identifying a first default receive beam of a set of default receive beams based at least in part on a control resource set identifier, wherein the control resource set identifier is based at least in part on a latest symbol or a latest slot that a control resource set is monitored within the active bandwidth part associated with the serving cell;
receiving an indication of a second default receive beam of the set of default receive beams;
determining the second default receive beam based at least in part on the indication; and
receiving one or more data samples for physical downlink shared channels jointly over the first default receive beam and the second default receive beam.
16 . The method of claim 15 , further comprising:
determining the second default receive beam of the set of default receive beams based at least in part on a first transmission configuration indicator state associated with the first default receive beam that is paired with a second transmission configuration indicator state associated with the second default receive beam.
17 . The method of claim 15 ,
wherein the control resource set identifier is a lowest control resource set identifier in the latest symbol or the latest slot that the control resource set is monitored within the active bandwidth part associated with the serving cell.
18 . The method of claim 15 , wherein the first default receive beam of the set of default receive beams is different from the second default receive beam of the set of default receive beams over one or more periods.
19 . The method of claim 18 , wherein the one or more periods relate to one or more transmission time intervals comprising one or more symbols, one or more mini-slots, one or more slots, or a combination thereof.
20 . A method for wireless communication, comprising:
monitoring one or more control resource sets within an active bandwidth part associated with a serving cell;
identifying a first default receive beam of a set of default receive beams based at least in part on a first control resource set identifier, wherein the first control resource set identifier is based at least in part on a latest symbol or a latest slot that a control resource set is monitored within the active bandwidth part associated with the serving cell;
determining a second default receive beam of the set of default receive beams based at least in part on a second control resource set identifier; and
receiving one or more data samples jointly for physical downlink shared channels over the first default receive beam and the second default receive beam.
21 . The method of claim 20 , wherein the first control resource set identifier is a first lowest control resource set identifier in a latest symbol or a latest slot that a control resource set is monitored within an active bandwidth part associated with a serving cell.
22 . The method of claim 21 , wherein the second control resource set identifier is a second lowest control resource set identifier in the latest symbol or the latest slot that the control resource set is monitored within the active bandwidth part associated with the serving cell.
23 . The method of claim 20 , wherein the first control resource set identifier is different from the second control resource set identifier.
24 . The method of claim 20 , wherein the first control resource set identifier corresponds to a first transmission configuration indicator state.
25 . The method of claim 24 , wherein the second control resource set identifier corresponds to a second transmission configuration indicator state different from the first transmission configuration indicator state.
26 . The method of claim 20 , further comprising:
receiving control signaling comprising an indication of a pair of default receive beams corresponding to a transmission configuration indicator state pair, wherein the set of default receive beams includes the pair of default receive beams.
27 . The method of claim 26 , wherein the control signaling comprises radio resource control signaling.
28 . The method of claim 26 , wherein the control signaling comprises medium access control-control element signaling.