Event-based layer 1 measurement reporting
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may measure a layer 1 (L1) metric in a candidate cell associated with a layer 1 or layer 2 triggered mobility (LTM). The UE may determine that the L1 metric in the candidate cell satisfies a triggering event condition. The UE may transmit, to a network node, an L1 measurement report based at least in part on the L1 metric in the candidate cell satisfying the triggering event condition. Numerous other aspects are described.
1 . An apparatus for wireless communication at a user equipment (UE), comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
measure a layer 1 (L1) metric in a candidate cell associated with a layer 1 or layer 2 triggered mobility (LTM), wherein the L1 metric is a filtered L1 metric, and the L1 metric is different from a cell level metric defined for a layer 3 (L3) event at the UE;
determine that the L1 metric in the candidate cell satisfies a triggering event condition; and
transmit, to a network node, an L1 measurement report based at least in part on the L1 metric in the candidate cell satisfying the triggering event condition.
2 . The apparatus of claim 1 ,
wherein the L1 metric is one or more of a reference signal received power (RSRP) measurement or a signal-to-interference-plus-noise ratio (SINR) measurement of a beam associated with the candidate cell.
3 . The apparatus of claim 1 ,
wherein the one or more processors, to transmit the L1 measurement report, are configured to:
transmit the L1 measurement report in uplink control information (UCI) via a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH); or
transmit the L1 measurement report in a medium access control control element (MAC-CE) via the PUSCH.
4 . The apparatus of claim 1 ,
wherein the L1 metric is filtered based at least in part on a standard predefinition or an indication from the network node.
5 . The apparatus of claim 1 ,
wherein the one or more processors are configured to determine that the L1 metric in the candidate cell satisfies the triggering event condition based at least in part on comparing the L1 metric in the candidate cell to a serving cell metric.
6 . The apparatus of claim 1 ,
wherein the one or more processors are configured to determine that the L1 metric in the candidate cell satisfies the triggering event condition based at least in part on comparing the L1 metric in the candidate cell to a threshold value.
7 . The apparatus of claim 1 ,
wherein the one or more processors are configured to determine that the L1 metric in the candidate cell satisfies the triggering event condition based at least in part on a change in the L1 metric, as compared to a previous measured L1 metric, that satisfies a threshold value.
8 . The apparatus of claim 1 ,
wherein the one or more processors are configured to determine that the L1 metric in the candidate cell satisfies the triggering event condition based at least in part on a ranking change of L1 metrics for a set of candidate cells, including the L1 metric in the candidate cell.
9 . The apparatus of claim 1 ,
wherein the one or more processors are configured to determine that the L1 metric in the candidate cell satisfies the triggering event condition based at least in part on a quantity of beams associated with the candidate cell satisfying a condition.
10 . The apparatus of claim 1 ,
wherein the L1 metric is a spatial domain or time domain filtered L1 measurement.
11 . The apparatus of claim 1 ,
wherein the triggering event condition is defined based at least in part on one or more of: one time instance, an average value over a period of time, a maximum value over the period of time, a minimum value over the period of time, or a quantity of occurrences over the period of time.
12 . The apparatus of claim 1 ,
wherein the one or more processors are configured to transmit the L1 measurement report based at least in part on one or more of a start condition or a stop condition.
13 . The apparatus of claim 12 ,
wherein a presence of the stop condition is based at least in part on the triggering event condition.
14 . The apparatus of claim 12 ,
wherein the one or more processors are further configured to:
receive, from the network node, an L1 measurement report configuration that indicates that the L1 measurement report is to be transmitted a single time or that the L1 measurement report is to be transmitted multiple times until the stop condition is satisfied, wherein the stop condition is based at least in part on a maximum quantity of L1 measurement reports.
15 . An apparatus for wireless communication at a network node, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
transmit, to a user equipment (UE), a layer 1 (L1) measurement report configuration; and
receive, from the UE and based at least in part on the L1 measurement report configuration, an L1 measurement report based at least in part on an L1 metric in a candidate cell satisfying a triggering event condition, the L1 metric in the candidate cell being associated with a layer 1 or layer 2 triggered mobility (LTM), wherein the L1 metric is a filtered L1 metric, and the L1 metric is different from a cell level metric defined for a layer 3 (L3) event at the UE.
16 . The apparatus of claim 15 ,
wherein the L1 metric is one or more of a reference signal received power (RSRP) measurement or a signal-to-interference-plus-noise ratio (SINR) measurement of a beam associated with the candidate cell.
17 . The apparatus of claim 15 ,
wherein the one or more processors, to receive the L1 measurement report, are configured to:
receive the L1 measurement report in uplink control information (UCI) via a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH); or
receive the L1 measurement report in a medium access control control element (MAC-CE) via the PUSCH.
18 . The apparatus of claim 15 ,
wherein the L1 metric is filtered based at least in part on a standard predefinition or an indication from the network node.
19 . The apparatus of claim 15 ,
wherein the L1 metric in the candidate cell satisfies the triggering event condition based at least in part on the L1 metric in the candidate cell in comparison to a serving cell metric.
20 . The apparatus of claim 15 ,
wherein the L1 metric in the candidate cell satisfies the triggering event condition based at least in part on the L1 metric in the candidate cell in comparison to a threshold value.
21 . The apparatus of claim 15 ,
wherein the L1 metric in the candidate cell satisfies the triggering event condition based at least in part on a change in the L1 metric, as compared to a previous measured L1 metric, that satisfies a threshold value.
22 . The apparatus of claim 15 ,
wherein the L1 metric in the candidate cell satisfies the triggering event condition based at least in part on a ranking change of L1 metrics for a set of candidate cells, including the L1 metric in the candidate cell.
23 . The apparatus of claim 15 ,
wherein the L1 metric in the candidate cell satisfies the triggering event condition based at least in part on a quantity of beams associated with the candidate cell satisfying a condition.
24 . The apparatus of claim 15 ,
wherein the L1 metric is a spatial domain or time domain filtered L1 measurement.
25 . The apparatus of claim 15 ,
wherein the triggering event condition is defined based at least in part on one or more of: one time instance, an average value over a period of time, a maximum value over the period of time, a minimum value over the period of time, or a quantity of occurrences over the period of time.
26 . The apparatus of claim 15 ,
wherein the L1 measurement report is based at least in part on one or more of a start condition or a stop condition.
27 . The apparatus of claim 26 ,
wherein a presence of the stop condition is based at least in part on the triggering event condition.
28 . The apparatus of claim 26 ,
wherein the L1 measurement report configuration indicates that the L1 measurement report is to be transmitted a single time or that the L1 measurement report is to be transmitted multiple times until the stop condition is satisfied, wherein the stop condition is based at least in part on a maximum quantity of L1 measurement reports.
29 . A method of wireless communication performed by a user equipment (UE), comprising:
measuring a layer 1 (L1) metric in a candidate cell associated with a layer 1 or layer 2 triggered mobility (LTM), wherein the L1 metric is a filtered L1 metric, and the L1 metric is different from a cell level metric defined for a layer 3 (L3) event at the UE;
determining that the L1 metric in the candidate cell satisfies a triggering event condition; and
transmitting, to a network node, an L1 measurement report based at least in part on the L1 metric in the candidate cell satisfying the triggering event condition.
30 . A method of wireless communication performed by a network node, comprising:
transmitting, to a user equipment (UE), a layer 1 (L1) measurement report configuration; and
receiving, from the UE and based at least in part on the L1 measurement report configuration, an L1 measurement report based at least in part on an L1 metric in a candidate cell satisfying a triggering event condition, the L1 metric in the candidate cell being associated with a layer 1 or layer 2 triggered mobility (LTM), wherein the L1 metric is a filtered L1 metric, and the L1 metric is different from a cell level metric defined for a layer 3 (L3) event at the UE.