Recovery mechanism for secondary cell
Aspects of the present disclosure relate to wireless communications, and more particularly, to cell recovery techniques. One example method generally includes receiving, on a first cell, an indication that one or more channel measurements are to be reported for a second cell for which beam failure is detected; transmitting a first message triggering reporting of at least one preferred beam for communicating on the second cell, the first cell being different from the second cell, wherein the first message is transmitted in response to the indication that the one or more channel measurements are to be reported; receiving a report indicating the at least one preferred beam; and configuring a transmission configuration state in accordance with the at least one preferred beam for communicating on the second cell.
1 . An apparatus for wireless communication at a communications device, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to cause the communications device to:
receive at least one pilot signal via a secondary cell;
detect a beam failure with respect to the secondary cell;
transmit, via a primary cell, an indication that one or more channel measurements are to be reported based on the detection;
receive, via the primary cell in response to the indication that the one or more channel measurements are to be reported, a first message that triggers reporting of at least one preferred beam for communication via the secondary cell;
determine the at least one preferred beam based on the at least one pilot signal;
transmit, via the primary cell, a report that indicates the at least one preferred beam;
receive a second message via the primary cell that confirms activation of a transmission configuration state; and
communicate via the secondary cell and via the at least one preferred beam in accordance with the activation of the transmission configuration state.
2 . The apparatus of claim 1 , wherein the one or more processors are configured to cause the communications device to receive the second message via a control resource set of the primary cell.
3 . The apparatus of claim 1 , wherein the second message comprises a medium access control (MAC) control element (CE) that indicates the confirmation of the transmission configuration state.
4 . The apparatus of claim 1 , wherein, to communicate via the secondary cell and via the at least one preferred beam, the one or more processors are configured to cause the communications device to communicate data via the secondary cell and via the at least one preferred beam in accordance with the transmission configuration state.
5 . The apparatus of claim 1 , wherein the one or more processors are configured to cause the communications device to transmit the report that indicates the at least one preferred beam via a medium access control (MAC) control element (CE).
6 . The apparatus of claim 1 , wherein:
the report that indicates the at least one preferred beam includes a beam index associated with the at least one preferred beam; and
the one or more processors are configured to cause the communications device to transmit the report via a medium access control (MAC) control element (CE).
7 . The apparatus of claim 1 , wherein:
the at least one preferred beam includes a plurality of preferred beams;
the report that indicates the at least one preferred beam includes a plurality of beam indices associated with the plurality of preferred beams; and
the one or more processors are configured to cause the communications device to transmit the report via a medium access control (MAC) control element (CE).
8 . The apparatus of claim 1 , wherein the first message comprises a physical downlink control channel (PDCCH).
9 . The apparatus of claim 1 , wherein the first message comprises downlink control information (DCI) that includes one or more bits that indicate to the communications device to report the at least one preferred beam.
10 . The apparatus of claim 1 , wherein the second message comprises a physical downlink control channel (PDCCH) that is scrambled with a cell-radio network temporary identifier (C-RNTI) associated with the secondary cell.
11 . The apparatus of claim 1 , wherein the second message further confirms reconfiguration of the transmission configuration state.
12 . An apparatus for wireless communication at a communications device, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to cause the communications device to:
receive, via a primary cell from a user equipment (UE), an indication that one or more channel measurements are to be reported for a secondary cell for which beam failure is detected;
transmit, via the primary cell in response to the indication that the one or more channel measurements are to be reported, a first message that triggers reporting by the UE of at least one preferred beam for communication via the secondary cell;
receive, from the UE via the primary cell, a report that indicates the at least one preferred beam; and
configure a transmission configuration state in accordance with the at least one preferred beam for communication via the secondary cell with the UE, wherein, to configure the transmission configuration state, the one or more processors are configured to cause the communications device to transmit a second message via the primary cell that confirms activation of the transmission configuration state.
13 . The apparatus of claim 12 , wherein the one or more processors are configured to cause the communications device to transmit the second message via a control resource set of the primary cell.
14 . The apparatus of claim 12 , wherein the second message comprises a medium access control (MAC) control element (CE) that indicates the confirmation of the transmission configuration state.
15 . The apparatus of claim 12 , wherein the one or more processors are further configured to cause the communications device to communicate data via the secondary cell and via the at least one preferred beam in accordance with the transmission configuration state.
16 . The apparatus of claim 12 , wherein the one or more processors are configured to cause the communications device to receive the report that indicates the at least one preferred beam via a medium access control (MAC) control element (CE).
17 . The apparatus of claim 12 , wherein:
the report that indicates the at least one preferred beam includes a beam index associated with the at least one preferred beam; and
the one or more processors are configured to cause the communications device to receive the report via a medium access control (MAC) control element (CE).
18 . The apparatus of claim 12 , wherein:
the at least one preferred beam includes a plurality of preferred beams;
the report that indicates the at least one preferred beam includes a plurality of beam indices associated with the plurality of preferred beams; and
the one or more processors are configured to cause the communications device to receive the report via a medium access control (MAC) control element (CE).
19 . The apparatus of claim 12 , wherein the first message comprises a physical downlink control channel (PDCCH).
20 . The apparatus of claim 12 , wherein the first message comprises downlink control information (DCI) that includes one or more bits that indicate to the communications device to report the at least one preferred beam.
21 . The apparatus of claim 12 , wherein the second message comprises a physical downlink control channel (PDCCH) that is scrambled with a cell-radio network temporary identifier (C-RNTI) associated with the secondary cell.
22 . The apparatus of claim 12 , wherein the second message further confirms reconfiguration of the transmission configuration state.
23 . A method for wireless communication at a user equipment (UE), comprising:
receiving at least one pilot signal via a secondary cell;
detecting a beam failure with respect to the secondary cell;
transmitting, via a primary cell, an indication that one or more channel measurements are to be reported based on the detection;
receiving, via the primary cell in response to the indication that the one or more channel measurements are to be reported, a first message that triggers reporting of at least one preferred beam for communication via the secondary cell;
determining the at least one preferred beam based on the at least one pilot signal;
transmitting, via the primary cell, a report that indicates the at least one preferred beam;
receiving a second message via the primary cell that confirms activation of a transmission configuration state; and
communicating via the secondary cell and via the at least one preferred beam in accordance with the activation of the transmission configuration state.
24 . The method of claim 23 , wherein at least one of:
receiving the second message comprises receiving the second message via a control resource set of the primary cell;
the second message comprises a medium access control (MAC) control element (CE) that indicates the confirmation of the transmission configuration state; or
the second message comprises a physical downlink control channel (PDCCH) that is scrambled with a cell-radio network temporary identifier (C-RNTI) associated with the secondary cell.
25 . The method of claim 23 , wherein communicating via the secondary cell and via the at least one preferred beam comprises communicating data via the secondary cell and via the at least one preferred beam in accordance with the transmission configuration state.
26 . The method of claim 23 , wherein:
transmitting the report that indicates the at least one preferred beam comprises transmitting the report via a medium access control (MAC) control element (CE); and
one of:
the report that indicates the at least one preferred beam includes a beam index associated with the at least one preferred beam; or
the at least one preferred beam includes a plurality of preferred beams and the report that indicates the at least one preferred beam includes a plurality of beam indices associated with the plurality of preferred beams.
27 . The method of claim 23 , wherein at least one of:
the first message comprises a physical downlink control channel (PDCCH); or
the first message comprises downlink control information (DCI) that indicates one or more bits that indicate to the UE to report the at least one preferred beam.
28 . The method of claim 23 , wherein the second message further confirms reconfiguration of the transmission configuration state.
29 . A method for wireless communication at a network entity, comprising:
receiving, via a primary cell from a user equipment (UE), an indication that one or more channel measurements are to be reported for a secondary cell for which beam failure is detected;
transmitting, via the primary cell in response to the indication that the one or more channel measurements are to be reported, a first message that triggers reporting by the UE of at least one preferred beam for communication via the secondary cell;
receiving, from the UE via the primary cell, a report that indicates the at least one preferred beam; and
configuring a transmission configuration state in accordance with the at least one preferred beam for communication via the secondary cell with the UE, wherein configuring the transmission configuration state comprises transmitting a second message via the primary cell that confirms activation of the transmission configuration state.
30 . The method of claim 29 , wherein at least one of:
transmitting the second message comprises transmitting the second message via a control resource set of the primary cell;
the second message comprises a medium access control (MAC) control element (CE) that indicates the confirmation of the transmission configuration state; or
the second message comprises a physical downlink control channel (PDCCH) that is scrambled with a cell-radio network temporary identifier (C-RNTI) associated with the secondary cell.
31 . The method of claim 29 , further comprising communicating data via the secondary cell and via the at least one preferred beam in accordance with the transmission configuration state.
32 . The method of claim 29 , wherein:
receiving the report that indicates the at least one preferred beam comprises receiving the report via a medium access control (MAC) control element (CE); and
one of:
the report that indicates the at least one preferred beam includes a beam index associated with the at least one preferred beam; or
the at least one preferred beam includes a plurality of preferred beams and the report that indicates the at least one preferred beam includes a plurality of beam indices associated with the plurality of preferred beams.
33 . The method of claim 29 , wherein at least one of:
the first message comprises a physical downlink control channel (PDCCH); or
the first message comprises downlink control information (DCI) that includes one or more bits that indicate to the UE to report the at least one preferred beam.
34 . The method of claim 29 , wherein the second message further confirms reconfiguration of the transmission configuration state.
35 . An apparatus for wireless communication, comprising:
means for receiving at least one pilot signal via a secondary cell;
means for detecting a beam failure with respect to the secondary cell;
means for transmitting, via a primary cell, an indication that one or more channel measurements are to be reported based on the detection;
means for receiving, via the primary cell in response to the indication that the one or more channel measurements are to be reported, a first message that triggers reporting of at least one preferred beam for communication via the secondary cell;
means for determining the at least one preferred beam based on the at least one pilot signal;
means for transmitting, via the primary cell, a report that indicates the at least one preferred beam;
means for receiving a second message via the primary cell that confirms activation of a transmission configuration state; and
means for communicating via the secondary cell and via the at least one preferred beam in accordance with the activation of the transmission configuration state.
36 . The apparatus of claim 35 , wherein at least one of:
the means for receiving the second message comprises means for receiving the second message via a control resource set of the primary cell;
the second message comprises a medium access control (MAC) control element (CE) that indicates the confirmation of the transmission configuration state; or
the second message comprises a physical downlink control channel (PDCCH) that is scrambled with a cell-radio network temporary identifier (C-RNTI) associated with the secondary cell.
37 . The apparatus of claim 35 , wherein the means for communicating via the secondary cell and via the at least one preferred beam comprises means for communicating data via the secondary cell and via the at least one preferred beam in accordance with the transmission configuration state.
38 . The apparatus of claim 35 , wherein:
the means for transmitting the report that indicates the at least one preferred beam comprises means for transmitting the report via a medium access control (MAC) control element (CE); and
one of:
the report that indicates the at least one preferred beam includes a beam index associated with the at least one preferred beam; or
the at least one preferred beam includes a plurality of preferred beams and the report that indicates the at least one preferred beam includes a plurality of beam indices associated with the plurality of preferred beams.
39 . The apparatus of claim 35 , wherein at least one of:
the first message comprises a physical downlink control channel (PDCCH); or
the first message comprises downlink control information (DCI) that indicates one or more bits that indicate to the apparatus to report the at least one preferred beam.
40 . The apparatus of claim 35 , wherein the second message further confirms reconfiguration of the transmission configuration state.
41 . A non-transitory computer-readable medium for wireless communication at a user equipment (UE), comprising:
executable instructions that, when executed by one or more processors, cause the UE to:
receive at least one pilot signal via a secondary cell;
detect a beam failure with respect to the secondary cell;
transmit, via a primary cell, an indication that one or more channel measurements are to be reported based on the detection;
receive, via the primary cell in response to the indication that the one or more channel measurements are to be reported, a first message that triggers reporting of at least one preferred beam for communication via the secondary cell;
determine the at least one preferred beam based on the at least one pilot signal;
transmit, via the primary cell, a report that indicates the at least one preferred beam;
receive a second message via the primary cell that confirms activation of a transmission configuration state; and
communicate via the secondary cell and via the at least one preferred beam in accordance with the activation of the transmission configuration state.
42 . The non-transitory computer-readable medium of claim 41 , wherein at least one of:
to receive the second message, the executable instructions, when executed by the one or more processors, further cause the UE to receive the second message via a control resource set of the primary cell;
the second message comprises a medium access control (MAC) control element (CE) that indicates the confirmation of the transmission configuration state; or
the second message comprises a physical downlink control channel (PDCCH) that is scrambled with a cell-radio network temporary identifier (C-RNTI) associated with the secondary cell.
43 . The non-transitory computer-readable medium of claim 41 , wherein to communicate via the secondary cell and via the at least one preferred beam, the executable instructions, when executed by the one or more processors, further cause the UE to communicate data via the secondary cell and via the at least one preferred beam in accordance with the transmission configuration state.
44 . The non-transitory computer-readable medium of claim 41 , wherein:
to transmit the report that indicates the at least one preferred beam, the executable instructions, when executed by the one or more processors, further cause the UE to transmit the report via a medium access control (MAC) control element (CE); and
one of:
the report that indicates the at least one preferred beam includes a beam index associated with the at least one preferred beam; or
the at least one preferred beam includes a plurality of preferred beams and the report that indicates the at least one preferred beam includes a plurality of beam indices associated with the plurality of preferred beams.
45 . The non-transitory computer-readable medium of claim 41 , wherein at least one of:
the first message comprises a physical downlink control channel (PDCCH); or
the first message comprises downlink control information (DCI) that indicates one or more bits that indicate to the UE to report the at least one preferred beam.
46 . The non-transitory computer-readable medium of claim 41 , wherein the second message further confirms reconfiguration of the transmission configuration state.
47 . An apparatus for wireless communication at a network entity, comprising:
means for receiving, via a primary cell from a user equipment (UE), an indication that one or more channel measurements are to be reported for a secondary cell for which beam failure is detected;
means for transmitting, via the primary cell in response to the indication that the one or more channel measurements are to be reported, a first message that triggers reporting by the UE of at least one preferred beam for communication via the secondary cell;
means for receiving from the UE via the primary cell, a report that indicates the at least one preferred beam; and
means for configuring a transmission configuration state in accordance with the at least one preferred beam for communication via the secondary cell with the UE, wherein the means for configuring the transmission configuration state comprises means for transmitting a second message via the primary cell that confirms activation of the transmission configuration state.
48 . The apparatus of claim 47 , wherein at least one of:
the means for transmitting the second message comprises means for transmitting the second message via a control resource set of the primary cell;
the second message comprises a medium access control (MAC) control element (CE) that indicates the confirmation of the transmission configuration state; or
the second message comprises a physical downlink control channel (PDCCH) that is scrambled with a cell-radio network temporary identifier (C-RNTI) associated with the secondary cell.
49 . The apparatus of claim 47 , further comprising means for communicating data via the secondary cell and via the at least one preferred beam in accordance with the transmission configuration state.
50 . The apparatus of claim 47 , wherein:
the means for receiving the report that indicates the at least one preferred beam comprises means for receiving the report via a medium access control (MAC) control element (CE); and
one of:
the report that indicates the at least one preferred beam includes a beam index associated with the at least one preferred beam; or
the at least one preferred beam includes a plurality of preferred beams and the report that indicates the at least one preferred beam includes a plurality of beam indices associated with the plurality of preferred beams.
51 . The apparatus of claim 47 , wherein at least one of:
the first message comprises a physical downlink control channel (PDCCH); or
the first message comprises downlink control information (DCI) that includes one or more bits that indicate to the UE to report the at least one preferred beam.
52 . The apparatus of claim 47 , wherein the second message further confirms reconfiguration of the transmission configuration state.
53 . A non-transitory computer-readable medium for wireless communication at a communications device, comprising:
executable instructions that, when executed by one or more processors, cause the communications device to:
receive, via a primary cell from a user equipment (UE), an indication that one or more channel measurements are to be reported for a secondary cell for which beam failure is detected;
transmit, via the primary cell in response to the indication that the one or more channel measurements are to be reported, a first message that triggers reporting by the UE of at least one preferred beam for communication via the secondary cell;
receive, from the UE via the primary cell, a report that indicates the at least one preferred beam; and
configure a transmission configuration state in accordance with the at least one preferred beam for communication via the secondary cell with the UE, wherein to configure the transmission configuration state, the executable instructions, when executed by the one or more processors, further cause the communications device to transmit a second message via the primary cell that confirms activation of the transmission configuration state.
54 . The non-transitory computer-readable medium of claim 53 , wherein at least one of:
to transmit the second message, the executable instructions, when executed by the one or more processors, further cause the communications device to transmit the second message via a control resource set of the primary cell;
the second message comprises a medium access control (MAC) control element (CE) that indicates the confirmation of the transmission configuration state; or
the second message comprises a physical downlink control channel (PDCCH) that is scrambled with a cell-radio network temporary identifier (C-RNTI) associated with the secondary cell.
55 . The non-transitory computer-readable medium of claim 53 , wherein the executable instructions, when executed by the one or more processors, further cause the communications device to communicate data via the secondary cell and via the at least one preferred beam in accordance with the transmission configuration state.
56 . The non-transitory computer-readable medium of claim 53 , wherein:
to receive the report that indicates the at least one preferred beam, the executable instructions, when executed by the one or more processors, further cause the communications device to receive the report via a medium access control (MAC) control element (CE); and
one of:
the report that indicates the at least one preferred beam includes a beam index associated with the at least one preferred beam; or
the at least one preferred beam includes a plurality of preferred beams and the report that indicates the at least one preferred beam includes a plurality of beam indices associated with the plurality of preferred beams.
57 . The non-transitory computer-readable medium of claim 53 , wherein at least one of:
the first message comprises a physical downlink control channel (PDCCH); or
the first message comprises downlink control information (DCI) that includes one or more bits that indicate to the UE to report the at least one preferred beam.
58 . The non-transitory computer-readable medium of claim 53 , wherein the second message further confirms reconfiguration of the transmission configuration state.