UE Serving Cell Selection with Signal Attenuation Handling
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Solution Overview
Problem
Conventional wireless network methods for serving cell selection in UE fail to consider signal attenuation, leading to increased power consumption and reduced Quality of Service (QoS) when operating in higher frequency bands with high attenuation, especially when lower frequency bands are sufficient for normal operations.
Innovation Solution
The UE prioritizes cells with the lowest available frequency during cell selection or reselection when signal attenuation is high or a trigger condition is met, pruning higher frequency band measurements unless signal quality deteriorates or a high-data-rate service is required, and reports UE Assistance Information (UAI) to the network to manage Carrier Aggression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE operates in higher frequency bands to achieve faster speed and greater bandwidth, then data transmission performance is improved, but signal attenuation increases and power consumption rises
Solution Approach 1:
The UE dynamically adjusts its operating frequency band based on real-time service requirements and signal conditions. When high data rates are needed, the UE operates in higher frequency bands; when normal operations suffice, it transitions to lower frequency bands, making the frequency selection adaptive rather than static
Solution Approach 2:
The patent changes the operating parameter (frequency band) of the UE based on service requirements. By switching between different frequency bands (e.g., from毫米波 to sub-6GHz), the system optimizes the balance between data transmission performance and power consumption
2Reliability
If the UE monitors resources across the entire bandwidth in higher frequency bands, then complete signal coverage is achieved, but power consumption increases
Solution Approach 1:
The UE extracts and monitors only the necessary portion of the frequency band based on service requirements. Instead of monitoring the entire bandwidth, it selectively monitors specific frequency ranges that are sufficient for the current service, reducing unnecessary power consumption while maintaining adequate coverage
3Ease of operation
If the UE selects cells based solely on signal strength without considering frequency bands, then cell selection is simplified, but power consumption increases and QoS deteriorates in high attenuation scenarios
Solution Approach 1:
The cell selection process is made locally adaptive by considering both signal strength and service requirements. The UE evaluates cells differently based on the specific service context - for normal operations, lower frequency cells are preferred; for high data rate services, higher frequency cells are considered, making the selection criteria context-dependent rather than uniform
Data Source
AI summary
According to an aspect of the disclosure, a user equipment (UE) in a wireless network is provided. The UE comprises a processor; and a memory storing instructions that, when executed by the processor, cause the UE to determine whether a trigger condition is detected or not; based on the trigger condition being not detected, select a cell among a plurality of cells for the UE in accordance with a signal quality; based on the trigger condition being detected, select a cell from at least one cell of low-band frequency category, the plurality of cells categorized into the low-band frequency category, a mid-band frequency category, and high-band frequency category; and camp to the cell or transmit, on a serving cell, a measurement report including a measurement result of the cell.