RedCap Terminal Cell Reselection via Priority-Based Frequency Selection
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Solution Overview
Problem
RedCap terminals with low reception performance face challenges in efficiently moving to and accessing base stations, particularly those using low frequency bands, which hinders their network connectivity and data communication capabilities.
Innovation Solution
A method involving the reception of master information blocks (MIB) and system information blocks (SIB) from base stations, including cell reselection-related information, allows RedCap terminals to perform cell reselection procedures based on priority values and threshold values, enabling them to move to more supportive frequencies and access the network effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If RedCap terminals use reduced reception capability to lower cost and complexity, then device complexity and price are reduced, but reception performance and network access efficiency deteriorate
Solution Approach 1:
The patent applies parameter changes by introducing terminal capability indication parameters (such as reception capability levels) that allow the network to identify RedCap terminals with limited reception capability. Based on these parameters, the network dynamically adjusts configuration parameters including bandwidth parts (BWPs), subcarrier spacings, and reference signal configurations to optimize performance for reduced-capability terminals while maintaining cost-effectiveness.
Solution Approach 2:
The patent implements local quality by providing differentiated network configurations tailored to specific terminal capabilities. Different BWPs, frequency bands, and resource allocation strategies are assigned to RedCap terminals based on their reception capability, ensuring that each terminal receives optimized parameters suited to its specific hardware limitations rather than a one-size-fits-all approach.
2Speed
If RedCap terminals attempt to access high frequency bands, then transmission rates can be achieved, but reception performance and connection reliability deteriorate due to limited reception capability
Solution Approach 1:
The patent applies dynamics by enabling flexible and dynamic frequency band selection and BWP configuration based on terminal capability and network conditions. The network can dynamically switch RedCap terminals between different frequency bands (e.g., from higher frequency bands to lower frequency bands like 700MHz or 2.6GHz) and adjust BWP parameters in real-time to maintain connection reliability while optimizing transmission rates according to the terminal's actual reception capability.
Solution Approach 2:
The patent changes physical layer parameters including frequency band, subcarrier spacing, and cyclic prefix length based on terminal capability indications. For RedCap terminals with limited reception capability, the network configures appropriate parameters such as narrower bandwidths, smaller subcarrier spacings, and longer cyclic prefixes to ensure reliable reception while still achieving acceptable transmission rates.
3Productivity
If general cell reselection procedures are used by RedCap terminals, then network mobility is supported, but access efficiency and connection speed deteriorate due to lack of priority-based reselection
Solution Approach 1:
The patent implements preliminary action by pre-configuring priority information for different frequency bands and cells that is specifically tailored to RedCap terminal capabilities. This priority information is provided in advance through system information blocks (SIBs) and RRC messages, allowing RedCap terminals to perform faster and more efficient cell reselection by directly comparing pre-evaluated priority values rather than performing complex measurements and evaluations during the reselection process.
Solution Approach 2:
The patent applies segmentation by separating cell reselection procedures into different priority levels based on terminal capability. Different priority rules and evaluation criteria are established for RedCap terminals versus conventional terminals, allowing optimized reselection paths for each category. The network can provide separate priority information for different frequency bands, cells, and BWP configurations specifically for RedCap terminals.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a terminal of a wireless communication system, according to one embodiment of the present disclosure, comprises the steps of: receiving a master information block (MIB) from a base station; receiving, on the basis of the MIB, a system information block (SIB) 1 from the base station; receiving, on the basis of the SIB 1 from the base station, at least one piece of system information including cell reselection-related information; and performing a cell reselection procedure on the basis of the cell reselection-related information. The cell reselection-related information includes cell reselection priority information for each frequency for a terminal having limited reception capability and cell reselection priority information for each frequency for an ordinary terminal.