UE Cell Reselection Measurement Reduction via Excluded Lists
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Solution Overview
Problem
The increasing demand for wireless data traffic in 5G communication systems necessitates efficient radio interface improvements, including reducing cell (re-)selection measurements to enhance network performance and support various applications and deployments.
Innovation Solution
Implementing a user equipment (UE) and base station configuration to utilize inter frequency excluded cell lists and on-demand acquisition of system information block 1 (SIB1) to minimize unnecessary cell reselection measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell reselection measurements are performed to ensure optimal network selection, then connection reliability is improved, but measurement time and processing resources are consumed
Solution Approach 1:
The network performs preliminary actions by pre-configuring and broadcasting excluded cell lists in system information blocks before the UE needs to perform cell reselection. This allows the UE to skip measurements for excluded cells without real-time network intervention, reducing measurement time while maintaining reliable connection selection through pre-established network guidance
Solution Approach 2:
The network provides feedback to the UE through system information blocks containing excluded cell lists, enabling the UE to use this feedback information to efficiently determine which cells to measure and which to skip. This feedback mechanism allows the UE to make informed decisions about cell selection based on network preferences without exhaustive measurement of all cells
2Reliability
If comprehensive cell measurements are conducted to ensure optimal cell selection, then connection quality is improved, but UE power consumption increases
Solution Approach 1:
The patent extracts unnecessary measurement tasks from the UE by having the network pre-identify and exclude unsuitable cells through system information broadcasting. This extraction of measurement burden from the UE perspective allows connection quality to be maintained through network-guided selection while significantly reducing UE power consumption by eliminating the need to measure and evaluate all potential cells
3Adaptability or versatility
If inter-frequency cell measurements are performed to support frequency diversity, then network adaptability is improved, but measurement complexity increases
Solution Approach 1:
The patent segments the cell measurement task into two distinct categories: intra-frequency cells (always measured) and inter-frequency cells (conditionally measured based on excluded cell lists). This segmentation allows the UE to maintain network adaptability by measuring only the necessary frequency bands while reducing overall measurement complexity through systematic categorization and prioritization of measurement tasks
Data Source
AI summary
A user equipment (UE) includes a transceiver configured to receive, from a first cell, at least one of a first inter frequency excluded cell list and a second inter frequency excluded cell list including one or more neighboring cells operating on a carrier frequency different from a carrier frequency on which the first cell is operating. The UE also includes a processor operably coupled to the transceiver. The processor is configured to determine whether the UE supports on demand acquisition of a system information block 1 (SIB1), and in response to a determination that the UE supports on demand acquisition of a SIB1, exclude the one or more neighboring cells in the second inter frequency excluded cell list from inter frequency cell reselection.