RedCap Cell Selection With Terminal-Specific Thresholds
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Solution Overview
Problem
RedCap terminals, due to reduced receiving antennas or antenna gain, face challenges in finding available cells to camp, leading to service interruptions due to decreased measurement results based on non-RedCap terminal thresholds.
Innovation Solution
A communication method and apparatus that determines cell selection criteria using first-type terminal-specific parameters, including threshold values and correction factors, to ensure RedCap terminals can identify suitable cells for camping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If RedCap terminals use the same cell selection threshold as non-RedCap terminals, then the cell selection criterion is simplified, but the measurement result decreases due to reduced receiving antennas or antenna gain, causing the terminal to be unable to find an available cell to camp
Solution Approach 1:
The patent applies local quality by introducing terminal-type-specific cell selection parameters (QrxlevminOffset_RedCap and QqualminOffset_RedCap) that are tailored to RedCap terminals' reduced capabilities. Instead of using a universal threshold for all terminals, the system provides differentiated parameters: non-RedCap terminals use the original Qrxlevmin and Qqualmin, while RedCap terminals use the offset-adjusted versions. This localized parameter adjustment ensures each terminal type can reliably camp on cells appropriate to its measurement capabilities without complicating the overall cell selection mechanism.
Solution Approach 2:
The patent implements parameter changes by modifying the cell selection parameters specifically for RedCap terminals through offset values. The network configures QrxlevminOffset_RedCap and QqualminOffset_RedCap parameters that are added to the original Qrxlevmin and Qqualmin thresholds. This parameter adjustment compensates for the reduced measurement results of RedCap terminals, allowing them to meet the cell selection criterion and successfully camp on available cells while maintaining the same fundamental cell selection process.
2Device complexity
If RedCap terminals reduce the number of receiving antennas or antenna gain to achieve lower complexity and cost, then device complexity and cost decrease, but the cell measurement result decreases, leading to service interruption
Solution Approach 1:
The patent addresses this contradiction by changing the cell selection parameter thresholds to match the reduced measurement capabilities of RedCap terminals. The network provides offset parameters (QrxlevminOffset_RedCap and QqualminOffset_RedCap) that are specifically designed to accommodate the lower measurement results from terminals with reduced antennas or antenna gain. This allows RedCap terminals to maintain their simplified hardware design while still being able to successfully camp on cells by using adjusted evaluation criteria.
3Device complexity
If RedCap terminals use the same cell selection parameters as non-RedCap terminals, then the network configuration is simplified, but the coverage of RedCap terminals is shrunk, causing service interruption
Solution Approach 1:
The patent applies local quality by introducing terminal-type-specific parameter offsets that are broadcast in system information. The network configures separate QrxlevminOffset_RedCap and QqualminOffset_RedCap values that are specifically intended for RedCap terminals. This allows the network to maintain a unified configuration structure while providing differentiated parameter sets for different terminal types, ensuring that RedCap terminals experience the same coverage area as non-RedCap terminals despite their reduced measurement capabilities.
Data Source
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AI summary
Provided in the present application are a communication method and apparatus. The method comprises: determining a measurement result of a first cell; and according to the cell measurement result of the first cell and a first cell selection parameter corresponding to a terminal device of a first type, determining whether the first cell satisfies a cell selection criterion corresponding to the terminal device of the first type, wherein the capabilities of the terminal device of the first type are fewer than those of a terminal device of a second type. By means of the method, when a RedCap terminal selects a resident cell, a first cell selection parameter corresponding to the RedCap terminal can be used to determine whether a cell selection criterion corresponding to the RedCap terminal is satisfied, thereby avoiding the problem whereby a RedCap terminal cannot find a cell to reside in due to the decrease in measurement results of cells.