RLM Parameter Modification for SCG Power Saving
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Solution Overview
Problem
Current radio link monitoring (RLM) for secondary cell groups (SCG) in power saving mode consumes significant power and may degrade UE throughput, as it requires continuous monitoring and measurement gaps that increase battery consumption and delay in NR networks.
Innovation Solution
The UE transitions the SCG from normal to power saving mode by modifying RLM parameters such as periodicity, sampling rate, and measurement gaps, allowing for relaxed RLM requirements, including adjusted BLER thresholds and RS types, to conserve power while maintaining link quality for seamless transitions back to normal mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous RLM monitoring is performed on SCG in power saving mode, then radio link quality is maintained, but UE battery consumption increases significantly
Solution Approach 1:
The patent implements periodic RLM monitoring instead of continuous monitoring by configuring measurement gaps at specific periodic intervals. The UE performs RLM measurements only during these scheduled gaps rather than continuously, thereby reducing power consumption while maintaining adequate radio link quality monitoring capability.
Solution Approach 2:
The patent applies partial action by performing RLM monitoring at reduced frequency during power saving mode. The measurement gaps are configured with longer periods and reduced sampling rates compared to normal operation, providing sufficient but not excessive monitoring to balance power savings with link quality assurance.
2Reliability
If measurement gaps are configured for RLM in power saving mode, then radio link monitoring is performed, but UE throughput is degraded due to monitoring delays
Solution Approach 1:
The patent implements dynamic RLM configuration where measurement gap periodicity and sampling rates are adjusted based on the operational mode. During power saving mode, longer measurement gaps are configured which reduces monitoring frequency but minimizes impact on throughput by aligning measurements with scheduled transmission opportunities rather than causing frequent interruptions.
Solution Approach 2:
The patent changes RLM parameters including measurement gap periodicity, sampling rate, and BLER thresholds specifically for power saving mode. These parameter adjustments optimize the balance between monitoring reliability and throughput performance by reducing measurement frequency while maintaining adequate link quality assessment capability.
3Use of energy by moving object
If RLM parameters are relaxed in power saving mode, then battery consumption is reduced, but detection precision of radio link problems decreases
Solution Approach 1:
The patent adjusts RLM parameters including BLER thresholds and measurement periodicity for power saving mode. By modifying these parameters, the system reduces measurement frequency and computational load to save battery while maintaining adequate detection precision through appropriately tuned thresholds that account for the reduced sampling rate.
Solution Approach 2:
The patent implements feedback mechanisms where RLM measurements taken during periodic measurement gaps provide information about radio link quality. This feedback enables the system to detect significant degradation events while operating with relaxed parameters, triggering appropriate responses only when necessary rather than requiring continuous high-precision monitoring.
Data Source
AI summary
According to some embodiments, a method is performed by a wireless device (110) for power saving. The wireless device operates with a first cell group and a second cell group. The method comprises: receiving a command to transition the second cell group from a first mode of operation to a second mode of operation; transitioning the second cell group into the second mode of operation; modifying at least one parameter that was used for performing radio link monitoring, RLM, associated with the second cell group while the second cell group was in the first mode of operation; and performing RLM according to the at least one modified parameter while the second cell group is in the second mode of operation.