RedCap UE Cell Reselection via SIB1 Indicator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 5G communication systems face challenges in efficiently supporting terminals with reduced capability (RedCap UE) for accessing and operating within New Radio (NR) cells, particularly in terms of system information acquisition and cell selection, due to limitations in performance and bandwidth.
Innovation Solution
A method and apparatus for a RedCap UE to select and access NR cells by utilizing specific search spaces and control resource sets within the initial bandwidth part, allowing for reduced bandwidth and power consumption while enabling necessary operations, and determining cell barring and intra-frequency reselection based on received system information blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RedCap UE uses standard 5G NR cell access procedures, then network compatibility is maintained, but bandwidth consumption and power usage exceed RedCap capabilities
Solution Approach 1:
The patent modifies system information block 1 to include a reduced capability indicator parameter that changes the cell access parameters specifically for RedCap UEs. This allows the network to provide tailored access conditions (different bandwidth, power, and resource allocation) that match RedCap capabilities while maintaining compatibility with standard UEs through separate parameter sets.
2Loss of information
If RedCap UE monitors all system information blocks for cell selection, then complete information is obtained, but processing complexity and power consumption increase
Solution Approach 1:
The patent extracts and isolates the reduced capability indicator from the standard system information block structure. RedCap UEs can then selectively acquire only the specific parameters relevant to their capability class (indicated by the reduced capability indicator) rather than processing all system information, thereby reducing complexity while maintaining information completeness for their operational context.
Solution Approach 2:
The patent segments system information into different parameter sets based on UE capability. The reduced capability indicator acts as a segmentation key that divides the monolithic system information block into capability-specific subsets, allowing RedCap UEs to process only their relevant portion while full-capability UEs access the complete set.
3Ease of operation
If RedCap UE accesses NR cells without optimized parameters, then general access is enabled, but cell reselection performance degrades
Solution Approach 1:
The patent applies local quality by providing differentiated system information parameters specifically tailored to RedCap UE characteristics. The reduced capability indicator triggers the provision of localized parameter sets (bandwidth, power, reselection thresholds) that are optimized for RedCap operational constraints, ensuring reliable cell reselection performance specific to this UE class rather than applying generic parameters.
Data Source
AI summary
A method and apparatus for selecting a NR cell in a mobile communication system are provided. Method for selecting a NR cell includes selecting, by a terminal, a first cell, acquiring, by the terminal in the first cell, a MIB, acquiring, by the terminal in the first cell, a SIB1 based at least in part on a first information in the MIB, considering, by the terminal, the first cell as barred, performing, by the terminal a first operation group if the SIB1 received in the first cell does not include a intraFreqReselection and performing, by the terminal a second operation group if the SIB1 received in the first cell includes the intraFreqReselection and the second intraFreqReselection is set to NotAllowed.