Wireless Node CSI Reporting Under Flexible Duplex Interference
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Solution Overview
Problem
In existing NR systems, the half-duplex mode in TDD spectrum leads to reduced resource utilization and increased latency, while flexible duplex modes like SBFD suffer from severe interference, necessitating improved methods for channel measurement and reporting.
Innovation Solution
A method for determining an appropriate transmission opportunity set for channel state information (CSI) reporting by using a reference time-domain resource set and conditions, allowing for flexible duplex modes and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If half-duplex mode is used in TDD spectrum, then self-interference is avoided and cross-link interference is alleviated, but resource utilization rate decreases and latency increases
Solution Approach 1:
The patent segments the spectrum into multiple subbands and divides transmission opportunities into different sets (first opportunity set for channel measurement, second opportunity set for CSI reporting). This segmentation allows simultaneous full-duplex operation on different subbands while managing interference through selective measurement opportunities, thereby improving resource utilization without exacerbating self-interference issues.
Solution Approach 2:
The patent applies different quality requirements to different measurement opportunities based on local interference conditions. By identifying specific transmission opportunities where interference is acceptable or manageable, the system can perform channel measurements locally in those opportunities, improving overall resource utilization while maintaining measurement accuracy where possible.
2Productivity
If flexible duplex mode (SBFD) is used, then resource utilization rate increases, but serious interference including self-interference and cross-link interference occurs
Solution Approach 1:
The patent performs preliminary identification of suitable transmission opportunities in the first opportunity set before actual channel measurement. By pre-selecting opportunities where interference conditions are acceptable, the system can proceed with measurements in a controlled manner, enabling flexible duplex operation while mitigating interference through advance planning and selection.
Solution Approach 2:
The patent changes the parameter of transmission opportunity selection by introducing a first condition that depends on a reference time-domain resource set. This parameter change allows dynamic adaptation to interference conditions, enabling the system to exploit flexible duplex modes for improved resource utilization while adjusting measurement opportunities to avoid periods of severe interference.
3Productivity
If channel measurement is performed without considering transmission opportunity constraints, then CSI reporting can be obtained, but CSI estimation precision deteriorates due to interference
Solution Approach 1:
The patent performs preliminary identification of suitable transmission opportunities by evaluating them against a first condition before actual channel measurement. This preliminary action ensures that measurements are only performed in opportunities where interference conditions are acceptable, thereby maintaining CSI estimation precision while still enabling comprehensive CSI reporting capability across multiple opportunities.
Solution Approach 2:
The patent uses feedback from the first condition evaluation to guide channel measurement decisions. By continuously assessing whether transmission opportunities meet the required conditions and adjusting measurement selections accordingly, the system maintains accurate CSI estimation while preserving the ability to report CSI across diverse transmission opportunities.
Data Source
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AI summary
The present application discloses a method and apparatus for a node used for wireless communication. The method comprises: a first node receiving a first information block, the first information block being used for determining a reference time-domain resource set; receiving a first CSI reporting configuration, the first CSI reporting configuration indicating a first RS resource set, and the first RS resource set including one or more RS resources; and sending first CSI reporting. A first opportunity set includes at least one transmission opportunity, which is not later than that of a CSI reference resource of the first CSI reporting and meets a first condition, of at least one RS resource in the first RS resource set, and the first condition depends on the reference time-domain resource set; and the first opportunity set is used for obtaining channel measurement used for calculating the first CSI reporting. The method can determine a transmission opportunity of an RS resource used for CSI reporting, and is applicable to different application scenarios/environments/modes, thereby increasing the flexibility and the transmission capacity of a system.