CORESET-Based PDCCH Channel Measurement for 5G Link Adaptation
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Solution Overview
Problem
Conventional wireless communication systems face challenges in using channel state information (CSI) reports for physical downlink shared channels (PDSCH) to perform link adaptation for physical downlink control channels (PDCCH) due to differing channel conditions and encoding schemes, leading to inefficient power consumption and suboptimal PDCCH monitoring.
Innovation Solution
The system enables channel measurement and reporting for PDCCH receptions in control resource sets (CORESETs), allowing for dynamic adaptation of CORESET configurations, PDSCH DM-RS based DL control information, and dynamic configuration of connected mode DRX parameters based on PDCCH decoding outcomes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSI reports for PDSCH are used for link adaptation of PDCCH, then link adaptation can be performed, but the accuracy and effectiveness of link adaptation deteriorates due to different channel conditions and encoding schemes
Solution Approach 1:
The patent segments the channel measurement process by introducing separate CSI measurement and reporting mechanisms for PDCCH and PDSCH. Instead of using a unified CSI report for both channels, the system divides the measurement process into channel-specific segments, allowing accurate channel quality assessment for PDCCH while maintaining separate optimization for PDSCH.
Solution Approach 2:
The patent introduces CSI-RS (Channel State Information Reference Signals) as an intermediary for PDCCH channel measurement. These reference signals serve as a mediator between the PDCCH transmission and the UE's channel quality assessment, enabling accurate measurement without directly relying on PDSCH CSI reports which are optimized for different channel conditions and encoding schemes.
2Reliability
If PDCCH monitoring is performed continuously to ensure reliable control channel reception, then reception reliability improves, but UE power consumption increases
Solution Approach 1:
The patent implements dynamic PDCCH monitoring adaptation where the UE adjusts its monitoring behavior based on channel conditions and traffic patterns. The network can configure different monitoring occasions and densities dynamically, allowing the system to maintain reliable PDCCH reception when needed while reducing monitoring activity during periods of low traffic or good channel conditions, thereby optimizing power consumption.
Solution Approach 2:
The patent changes the monitoring parameters (such as monitoring periodicity, aggregation level, and search space configuration) based on channel quality indicators and traffic requirements. When channel conditions are good or traffic is low, the system increases monitoring intervals and reduces aggregation levels to save power. When reliability requirements increase or channel conditions deteriorate, the system adjusts parameters to enhance monitoring intensity.
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AI summary
The present disclosure relates to 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 present disclosure 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. A UE configured to receive a first configuration for a first CORESET, a second configuration for a reception of a first CSI-RS and the first CSI-RS, to compute a first CQI value, based on the first CSI-RS, for a first PDCCH reception in the first CORESET and at least one CQI value based on the first CQI value, and to transmit a channel that includes the at least one CQI value is provided.