L1/L2 Mobility Cell Measurement Control for UE Power Reduction
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Solution Overview
Problem
L1/L2 based inter-cell mobility control leads to increased measurement and reporting load and unacceptable power consumption for user equipment (UE), making it impractical for UEs to measure all configured candidate cells due to resource limitations.
Innovation Solution
Implementing a mechanism where the network indicates target cells for measurement, measurement triggers, and reference signals to the UE, allowing it to perform measurements only on selected cells and reducing the frequency of measurements, thereby conserving resources and power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE is configured to perform measurements on all configured candidate cells, then the mobility measurement coverage is improved, but the power consumption and measurement load increase significantly
Solution Approach 1:
The patent extracts and identifies a specific subset of candidate cells (target cells) from the complete set of configured candidate cells based on L3 measurement reports. The network determines which cells are most relevant for mobility purposes and extracts only those for L1 measurement requirements, thereby reducing the measurement load while maintaining mobility coverage.
Solution Approach 2:
The patent segments the measurement process into two distinct phases: L3 measurements performed by the UE on all candidate cells, and L1 measurements performed only on a selected subset of target cells. This segmentation allows the system to maintain comprehensive mobility monitoring while reducing the immediate measurement burden on the UE through selective L1 reporting.
2Speed
If the UE performs frequent measurements and reporting for multiple candidate cells, then the mobility response speed is improved, but the resource consumption and complexity increase
Solution Approach 1:
The patent applies partial action by requiring the UE to perform L1 measurements and reporting only on a subset of target cells rather than all configured candidate cells. The network determines the appropriate subset based on L3 measurement reports, applying partial measurement action that is sufficient for mobility decisions without the excessive burden of measuring all cells.
3Adaptability or versatility
If the network configures multiple LTM candidate cell configurations, then the mobility flexibility is improved, but the UE measurement burden increases
Solution Approach 1:
The patent applies preliminary action by having the UE perform L3 measurements on all candidate cells first, which provide the network with advance information about cell qualities. Based on these preliminary L3 results, the network then selectively configures L1 measurements only on the most promising target cells, avoiding the need for the UE to perform exhaustive L1 measurements on all candidates.
Data Source
AI summary
There are provided measures for L1/L2 triggered mobility cell measurement control. Such measures exemplarily comprise determining a plurality of target cell candidates for L1/L2 triggered mobility of a terminal, deciding on a first cell to be measured out of the plurality of target cell candidates, and transmitting, towards the terminal, information indicative of a Layer1 measurement demand with respect to said first cell to be measured.