NR CSI Resource Allocation for Interference-Aware Duplex Switching
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Solution Overview
Problem
In wireless communication systems, particularly in New Radio (NR) systems, there is a challenge in allocating resources for interference measurements required for calculating Channel State Information (CSI), which affects resource utilization and latency due to half-duplex modes like TDD.
Innovation Solution
A method for determining time domain resources that dynamically allocate separate resource sets for channel and interference measurements, allowing flexible duplex modes such as SBFD, to improve accuracy and reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
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 applies dynamic time-domain resource allocation by configuring different resource sets (first resource set for channel measurement, second resource set for interference measurement) based on time domain resource conditions. This allows the system to dynamically adapt between half-duplex and flexible duplex modes, optimizing both interference avoidance and resource utilization根据不同时序资源配置选择合适的测量资源集
Solution Approach 2:
The patent changes the parameter of duplex mode from fixed half-duplex to flexible variable mode. By introducing configurable resource sets and their corresponding configurations, the system can adjust the operational mode based on traffic conditions and interference levels, improving resource utilization while maintaining interference avoidance capabilities
2Reliability
If half-duplex mode is used in TDD spectrum, then self-interference is avoided, but latency increases
Solution Approach 1:
The patent enables dynamic switching between operational modes by configuring multiple resource sets with different characteristics. When low latency is required, the system can utilize flexible duplex configurations that allow simultaneous uplink-downlink transmissions in different time slots, reducing waiting time while maintaining self-interference avoidance through proper resource isolation
3Productivity
If flexible duplex mode or full-duplex mode is supported, then resource utilization rate improves, but interference measurement complexity increases
Solution Approach 1:
The patent segments interference measurement resources into distinct resource sets (second resource set for interference measurement, third resource set for additional interference measurement). Each resource set is independently configured and can be selectively activated based on the duplex mode and interference conditions. This segmentation simplifies the measurement process by providing clear, dedicated resources for different interference scenarios rather than requiring complex dynamic resource selection
Solution Approach 2:
The patent introduces configurable parameters including resource set configurations, time domain resource allocations, and associations between resource sets and CSI reporting. These parameters allow the system to adapt to flexible duplex modes while maintaining manageable complexity through standardized configuration mechanisms and clear resource-to-reporting relationships
4Measurement precision
If multiple resource sets are configured for interference measurement, then interference measurement accuracy improves, but signaling overhead increases
Solution Approach 1:
The patent creates resource sets that can serve multiple functions: the second resource set can be used for interference measurement in both half-duplex and flexible duplex modes, while the third resource set provides additional measurement capability when needed. This multi-functionality allows accurate interference measurement across different operational scenarios without requiring entirely separate resource configurations for each mode, thereby reducing overall signaling overhead
Data Source
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AI summary
Disclosed in the present application are a method and apparatus in a node used for wireless communication. A first receiver receives a first information block, wherein the first information block is used for determining a first time domain resource, and the first time domain resource comprises at least one symbol; a first configuration information block is received, wherein the first configuration information block is used for determining a first resource set and a second resource set; and a first transmitter sends first CSI, wherein the first resource set is used to obtain a channel measurement for calculating the first CSI, at least one of the second resource set or a third resource set is used to obtain an interference measurement for calculating the first CSI, and whether the third resource set is used to obtain the interference measurement for calculating the first CSI depends on the first time domain resource. By means of the present application, the signaling overheads are saved, and the system performance is improved.