Secondary Cell Activation Reference Signal Measurement
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently measuring reference signals during secondary cell activation in New Radio (NR), particularly for unknown physical uplink control channel (PUCCH) secondary cells, which affects pathloss estimation and resource allocation.
Innovation Solution
The proposed solution involves improved reference signal measurement mechanisms, where user equipment (UE) performs measurements on secondary cells using pathloss-reference signals (PL-RS) and downlink reference signals (DL-RS), and generates measurement reports to be transmitted to the base station. This includes determining pathloss estimation based on layer-1 and layer-3 measurements, and differentiating measurement behaviors based on whether the PL-RS is maintained or not.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE performs reference signal measurements on unknown PUCCH SCell during activation, then the pathloss estimation accuracy is improved, but the measurement time and processing complexity increase
Solution Approach 1:
The patent applies preliminary action by performing reference signal measurements before the PUCCH SCell activation is complete. The UE measures reference signals (such as SSB or CSI-RS) in advance and reports the measurements (e.g., RSRP values) to the network before full activation, allowing the network to prepare pathloss estimation parameters in advance. This reduces the measurement time required during the actual activation process while maintaining accurate pathloss estimation.
2Measurement precision
If the UE performs reference signal measurements on unknown PUCCH SCell during activation, then the pathloss estimation accuracy is improved, but the UE power consumption increases
Solution Approach 1:
The patent applies preliminary action by performing reference signal measurements before the PUCCH SCell activation is complete. The UE measures reference signals (such as SSB or CSI-RS) in advance and reports the measurements (e.g., RSRP values) to the network before full activation, allowing the network to prepare pathloss estimation parameters in advance. This reduces the measurement time required during the actual activation process while maintaining accurate pathloss estimation.
Solution Approach 2:
The patent applies feedback by having the UE report measurement results (e.g., L1-RSRP values) back to the network node. The network uses this feedback information to determine whether to activate the PUCCH SCell and to calculate appropriate pathloss estimation parameters. This feedback mechanism allows the network to make informed decisions about cell activation and power management, reducing unnecessary UE power consumption while maintaining measurement accuracy when needed.
3Speed
If the network activates PUCCH SCell without prior measurement configuration, then the activation speed is improved, but the pathloss estimation reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by configuring the UE to measure reference signals before the PUCCH SCell activation command is executed. The network node configures measurement parameters (such as reference signal resources for SSB or CSI-RS) in advance, and the UE performs measurements before activation is complete. This ensures that reliable measurement data is available when the SCell is activated, maintaining pathloss estimation reliability while still enabling relatively fast activation.
Solution Approach 2:
The patent applies feedback by having the UE report measurement results (e.g., L1-RSRP values) back to the network node. The network uses this feedback information to determine whether to activate the PUCCH SCell and to calculate appropriate pathloss estimation parameters. This feedback mechanism allows the network to make informed decisions about cell activation and power management, reducing unnecessary UE power consumption while maintaining measurement accuracy when needed.
Data Source
AI summary
A user equipment (UE) may receive, from a base station (BS) configured to support activation of a secondary cell (SCell), a request to provide a measurement report. In response to the request, the UE may perform one or more measurements on the SCell using one or more reference signals (RSs). Additionally or alternatively, the UE may generate the measurement report based on the one or more measurements and further transmit the measurement report to the BS. In some embodiments, the UE may further determine a pathloss estimation based on the one or more measurements.