User Equipment Power Optimization via Mobility-Based Measurement Deferral
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Solution Overview
Problem
Current 5G user equipment (UE) experiences high power consumption due to frequent radio resource management (RRM) measurements, especially in low mobility states and strong signal conditions, leading to unnecessary battery drain and reduced battery performance.
Innovation Solution
Implementing a method where the UE receives relaxed measurement parameters from the network to determine its mobility state and location relative to the cell edge, allowing it to defer unnecessary RRM measurements and background PLMN searches, thereby optimizing power consumption by increasing the periodicity between scans and avoiding measurements during CDRX sleep durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs frequent RRM measurements to ensure reliable network connectivity and mobility management, then the measurement precision and reliability are improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of measurement periodicity based on UE mobility state. The network configures different measurement periodicities for different mobility states (e.g., high mobility, medium mobility, low mobility). When UE is in low mobility state, the measurement periodicity is increased (measurements are performed less frequently), thereby reducing power consumption while maintaining adequate connectivity reliability. This dynamic adaptation resolves the contradiction by making the measurement frequency flexible rather than fixed.
Solution Approach 2:
The patent changes the measurement periodicity parameter based on mobility conditions. The network determines UE mobility state and configures appropriate measurement periodicity values (e.g., short periodicity for high mobility, long periodicity for low mobility). This parameter change allows the system to reduce measurement frequency (and thus power consumption) when high measurement precision is not critical, while maintaining reliability when needed.
2Reliability
If the UE performs background PLMN searches frequently to ensure optimal network selection, then the network selection reliability is improved, but the power consumption increases
Solution Approach 1:
The patent applies dynamic adjustment to background PLMN search periodicity as well. Based on UE mobility state determination, the network configures different search periodicities. For low mobility UEs, the search periodicity is increased (searches performed less frequently), reducing power consumption. For high mobility UEs, the periodicity remains shorter to ensure reliable network selection. This dynamic approach resolves the contradiction between search reliability and power consumption.
3Use of energy by moving object
If the UE increases measurement periodicity to reduce power consumption, then the power efficiency is improved, but the mobility management capability deteriorates
Solution Approach 1:
The patent uses dynamic mobility state detection to adjust measurement periodicity. The network continuously monitors UE mobility indicators (e.g., handover frequency, position change rate) and adapts the measurement periodicity accordingly. When UE enters high mobility state, periodicity is reduced to maintain mobility management capability. When UE is in low mobility state, periodicity is increased to improve power efficiency. This dynamic adaptation ensures that mobility management capability is maintained only when necessary.
Solution Approach 2:
The patent changes measurement periodicity parameters based on detected mobility conditions. Different periodicity values are configured for different mobility states (high, medium, low). This parameter change strategy allows the system to optimize power efficiency by using longer periodicities for low mobility UEs, while maintaining adequate mobility management capability through shorter periodicities for high mobility UEs.
4Measurement precision
If the UE performs measurements during CDRX sleep durations, then the measurement precision is maintained, but the battery performance deteriorates
Solution Approach 1:
The patent implements periodic measurement action that aligns with CDRX cycles. Instead of performing measurements continuously or during every CDRX wake period, the system performs measurements at optimized intervals that coincide with CDRX wake durations. For low mobility UEs, measurements are performed less frequently, allowing the UE to remain in sleep mode longer and conserve battery energy, while still maintaining adequate measurement precision for network operations.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method for optimizing power in a user equipment (UE) is provided. The method includes receiving, from a network, one or more relaxed measurement parameters, determining one of a mobility state or a location of the UE with respect to an edge of a serving cell of a visited public land mobile network (VPLMN) of the network based on one or more relaxed measurement parameters, and deferring a background PLMN (BPLMN) search upon determining one of the UE being in a low mobility state or not being at the edge of the serving cell, and/or deferring a near cell measurement search during a measurement gap of a connected mode discontinuous reception (CDRX) sleep duration of a CDRX state to optimize the power consumption in the UE upon determining one of the UE being in the low mobility state or not being located at the edge of the serving cell.