PUSCH Repetition Type B CSI Reporting in 5G Uplink
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in efficiently reporting channel state information (CSI) through repeated uplink data transmission, which affects the performance and reliability of network cooperative communication.
Innovation Solution
A method and device configuration for a terminal and base station that involve receiving and transmitting CSI reports using specific PUSCH repetition types, including configuration of physical uplink shared channel (PUSCH) repetition type B, and utilizing sounding reference signal (SRS) resource indicators to manage nominal and actual repetitions, ensuring accurate CSI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUSCH repetition type B is used for uplink data transmission, then transmission reliability is improved, but CSI reporting accuracy deteriorates due to ambiguity between nominal and actual repetitions
Solution Approach 1:
The base station performs preliminary action by determining in advance which PUSCH repetition instances are actual repetitions carrying uplink data, and communicates this information to the terminal through DCI. This allows the terminal to accurately identify which repetitions contain data and should not be used for CSI reporting, resolving the ambiguity that previously degraded CSI accuracy while maintaining the reliability benefits of repetition type B.
2Measurement precision
If multiple SRS resource indicator fields are included in DCI to identify actual repetitions, then CSI reporting accuracy is improved, but device complexity increases
Solution Approach 1:
The DCI is segmented to include multiple SRS resource indicator fields, where each field corresponds to a specific PUSCH repetition instance. This segmentation allows the terminal to independently identify which repetitions are actual repetitions carrying data, improving CSI reporting accuracy by providing clear distinction between data-carrying and non-data-carrying repetitions, while the modular structure keeps complexity manageable.
Solution Approach 2:
The SRS resource indicator fields act as intermediaries between the base station's scheduling decisions and the terminal's CSI reporting actions. These indicator fields convey information about which PUSCH repetitions are actual repetitions, enabling the terminal to make accurate CSI reporting decisions without requiring complex analysis of transmission patterns, thus improving accuracy while limiting complexity growth.
3Loss of information
If CSI report is transmitted on all PUSCH repetitions, then information completeness is improved, but resource efficiency deteriorates due to redundant transmissions
Solution Approach 1:
Instead of transmitting CSI reports on all PUSCH repetitions (excessive action), the terminal transmits CSI reports only on selected repetitions identified as nominal repetitions not carrying actual uplink data. This partial action approach ensures that CSI information is still conveyed to the base station (maintaining information completeness) while avoiding redundant transmissions on repetitions where uplink data is present, thereby improving resource efficiency.
Data Source
AI summary
The disclosure relates to a communication technique for convergence between an IoT technology and a 5G communication system for supporting a higher data transmission rate than a 4G system, and a system thereof. The disclosure may be applied to intelligence services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail businesses, security and safety related services, etc.) based on a 5G communication technology and an IoT-related technology. The disclosure provides a coverage improvement method for a PDCCH in a wireless communication system.