NR Cell Prioritization Using Bandwidth-Biased Signal Measurements
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Solution Overview
Problem
Existing 5G NR systems face inefficiencies in UE mobility procedures due to varying UE throughput capabilities and carrier bandwidth mismatches, leading to suboptimal performance and power consumption issues.
Innovation Solution
Implementing mechanisms for NR cell prioritization based on carrier bandwidth, including cell search, reselection, and handover procedures that consider UE throughput requirements and carrier bandwidths, using biased signal strength measurements and offsets to guide UE to suitable cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE uses signal strength measurements alone for cell selection and handover, then mobility procedures are simple, but throughput performance is suboptimal due to carrier bandwidth mismatches
Solution Approach 1:
The patent modifies the signal strength measurement parameter by introducing bandwidth-dependent offsets (q-OffsetBW) that adjust the measured signal strength based on the carrier bandwidth comparison. This transforms the simple RSRP/RSRQ measurement into a biased measurement that accounts for bandwidth differences, thereby improving throughput performance without requiring complete redesign of the mobility procedure
Solution Approach 2:
The patent performs preliminary comparison of carrier bandwidths between serving cell and neighboring cells before final cell selection or handover decisions. By evaluating bandwidth compatibility in advance and applying appropriate offsets to signal strength measurements, the system prepares the mobility decision with bandwidth awareness, preventing suboptimal connections before they occur
2Adaptability or versatility
If UE connects to neighboring cells with different carrier bandwidths, then cell reselection flexibility increases, but power consumption increases due to bandwidth mismatches
Solution Approach 1:
The patent introduces bandwidth mismatch detection as a new parameter in the cell reselection evaluation process. By comparing carrier bandwidths and applying q-OffsetBW adjustments, the system modifies the effective signal strength measurement to reflect the energy cost of bandwidth mismatches, guiding UE to select cells with compatible bandwidths and reduce unnecessary power consumption
3Productivity
If UE prioritizes high bandwidth cells for high throughput requirements, then data throughput improves, but signal strength criteria may not be met without biasing
Solution Approach 1:
The patent applies counterbalancing offsets (q-OffsetBW) that compensate for the inherent disadvantage of connecting to cells with different carrier bandwidths. When a neighboring cell has a different bandwidth than the serving cell, the offset adjusts the measured signal strength to reflect the actual throughput capability, enabling UE to reliably evaluate and select high-bandwidth cells that meet throughput requirements while maintaining fair comparison with other cells
Data Source
AI summary
Disclosed herein are system, method, and computer program product embodiments for NR cell prioritization based on carrier bandwidths. An embodiment operates by storing a plurality of neighboring cell frequencies and respective carrier bandwidths of the plurality of neighboring cell frequencies. The embodiment determines whether a carrier bandwidth corresponding to a neighboring cell frequency of the plurality of neighboring cell frequencies is less than a serving cell carrier bandwidth. In response to a determination that the carrier bandwidth corresponding to the neighboring cell frequency is less than the serving cell carrier bandwidth, the embodiment determines a biased signal strength measurement by adding an offset to a signal strength measurement corresponding to the neighboring cell frequency, where the offset is determined based at least in part on a data throughput requirement of the UE. The embodiment evaluates a signal strength criteria of the neighboring cell frequency using the biased signal strength measurement corresponding to the neighboring cell frequency.