5G System Information Request Carrier Selection via RSRP Thresholds
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Solution Overview
Problem
Current 5G communication systems face challenges in efficiently managing system information requests, particularly when supplementary uplink (SUL) and normal uplink (NUL) carriers are configured, leading to complexities in selecting the appropriate message type for system information requests.
Innovation Solution
A method where a terminal determines whether SUL or NUL is configured based on specific criteria, such as RSRP thresholds, and transmits a preamble for system information requests using either Msg1 or Msg3 based on the presence and configuration of SI request configurations in SIB1, ensuring optimal carrier selection for system information acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple uplink carriers (SUL and NUL) are configured for system information requests, then the flexibility and coverage of the system are improved, but the device complexity and difficulty of selecting the appropriate carrier increase
Solution Approach 1:
The patent applies parameter changes by using RSRP (Reference Signal Received Power) thresholds as a dynamic parameter to determine carrier selection. The terminal compares the measured RSRP of the downlink carrier against configured thresholds to decide whether to use SUL or NUL for system information requests. This parameter-based approach transforms a complex multi-carrier selection problem into a straightforward threshold-comparison decision process, maintaining flexibility while reducing device complexity.
Solution Approach 2:
The patent implements preliminary action by pre-configuring SI request configurations and RSRP thresholds in SIB1 (System Information Block 1) before the terminal needs to make carrier selection decisions. The network provides the terminal with predefined rules and parameters in advance, so when the terminal needs to request system information, it can immediately apply the pre-established criteria without performing complex real-time analysis, thus reducing device complexity while preserving adaptability.
2Measurement precision
If the terminal uses RSRP thresholds to determine carrier selection, then the accuracy of carrier selection is improved, but the measurement precision requirements increase
Solution Approach 1:
The patent applies partial action by using RSRP measurements only for the purpose of carrier selection rather than requiring full-precision measurements for all system functions. The terminal performs RSRP measurement and compares it against thresholds to make a binary carrier selection decision (SUL or NUL), which requires less measurement precision than full channel quality assessment. This partial measurement approach achieves sufficient accuracy for carrier selection without demanding excessive measurement precision.
Solution Approach 2:
The patent segments the carrier selection process into distinct steps: (1) measure RSRP of the downlink carrier, (2) compare against pre-configured thresholds, (3) select carrier based on comparison result. This segmentation allows the system to use simplified threshold-based decision-making rather than requiring complex continuous optimization, reducing the precision requirements while maintaining adequate selection accuracy for the specific purpose of system information request carrier selection.
3Reliability
If the terminal transmits system information requests on the appropriate carrier based on configuration, then the data transmission reliability is improved, but the processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring SI request configurations including carrier selection criteria and RSRP thresholds in SIB1 before the terminal needs to transmit system information requests. The network provides all necessary decision-making parameters in advance, enabling the terminal to quickly determine the appropriate carrier without extended processing or consultation, thus reducing time loss while ensuring reliable transmission on the correctly selected carrier.
Solution Approach 2:
The patent uses parameter changes by dynamically selecting transmission carriers based on RSRP threshold comparisons. This parameter-based carrier selection allows the terminal to rapidly adapt to changing radio conditions and select the most reliable carrier (SUL or NUL) based on current signal strength measurements, improving transmission reliability while maintaining fast decision-making through simple threshold evaluation rather than complex multi-factor analysis.
Data Source
AI summary
A communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The method and system may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services in an a system information (SI) transmission in a cell supporting multiple uplink (UL) carriers.