De-prioritizing LTE Anchor Cell Based on NR Measurements
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Solution Overview
Problem
In wireless communication systems, particularly in 5G scenarios, UE devices often experience poor coverage and high energy consumption due to being stuck on an LTE anchor band with poor conditions, leading to ping-ponging between different RATs and LTE bands, resulting in suboptimal performance and battery life.
Innovation Solution
A method for de-prioritizing the LTE anchor cell in UE devices based on conditions such as low mobility, availability of NR cells, and better neighboring LTE cells, allowing the UE to reselect to more favorable cells for improved coverage and reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the network prioritizes the anchor band for LTE cell reselection, then the UE can maintain connection stability and simplify network management, but the UE experiences poor coverage and high energy consumption when the anchor band conditions are poor
Solution Approach 1:
The patent implements dynamic cell reselection priority adjustment by monitoring NR cell measurement results and modifying LTE anchor band priority accordingly. When NR measurements indicate poor 5G coverage (none of the NR cells satisfy B1-NR threshold), the UE automatically reduces the reselection priority of the LTE anchor band, enabling flexible adaptation to changing network conditions rather than maintaining static high priority
Solution Approach 2:
The patent employs feedback mechanisms where the UE continuously measures NR cell signals and uses these measurements to adjust LTE anchor band reselection priority. The measurement results feed back into the cell reselection decision process, creating a closed-loop system that optimizes energy consumption based on actual 5G coverage conditions
2Device complexity
If the network prioritizes the anchor band for LTE cell reselection, then the network management is simplified, but the UE performs unnecessary handovers and measurement reports causing ping-ponging between RATs and LTE bands
Solution Approach 1:
The patent dynamically adjusts LTE anchor band reselection priority based on NR measurement outcomes. When NR cells do not meet thresholds, the system automatically reduces anchor band priority, preventing forced handovers to poor-quality cells and eliminating the need for repeated measurement reports and handover attempts
Solution Approach 2:
The patent performs preliminary assessment of NR cell availability through measurement evaluation before committing to LTE anchor band reselection. By checking whether NR cells satisfy B1-NR thresholds in advance, the system avoids unnecessary handovers to anchor bands that would immediately require re-handover due to poor 5G coverage conditions
3Reliability
If the UE continuously measures and reports cell conditions to maintain optimal connection, then the connection quality is maintained, but the battery life is reduced due to high energy consumption
Solution Approach 1:
The patent applies partial measurement action by only triggering detailed NR cell measurements and anchor band reselection when specific conditions are met (when evaluating EN-DC configuration and B1-NR threshold satisfaction). Instead of continuous measurements regardless of condition, the system performs measurements selectively, reducing energy consumption while maintaining connection quality when needed
Data Source
AI summary
Systems and methods are disclosed for de-prioritizing an LTE anchor cell based on NR cell measurements. A UE may register on a first cell of a first Radio Access Technology (RAT), process a configuration message from a network prioritizing an anchor band of the first RAT, perform a first cell reselection from the first cell to a second cell of the first RAT that is in the anchor band, and perform cell measurements on one or more cells of a second RAT. In response to determining that none of the cell measurements for the one or more cells of the second RAT exceeds a threshold, the UE de-prioritizes the second cell in ranked cell prioritization data and performs a second cell reselection from the second cell of the first RAT to another cell of the first RAT based on the ranked cell prioritization data.