TCI State and QCL Beam Selection for Full-Duplex CSI Reporting
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Solution Overview
Problem
Existing wireless communication systems face interference issues in full-duplex operations due to interference between downlink and uplink transmissions, which degrade performance and hinder efficient channel state information reporting.
Innovation Solution
Implementing a transmission configuration indicator (TCI) state and quasi-colocation (QCL) type indicator to identify downlink and uplink reference signal resources, determining a receive beam based on the spatial relationship, and measuring interference to enhance CSI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex operations are implemented to increase network capacity and spectral efficiency, then productivity is improved, but interference between downlink and uplink transmissions increases causing performance degradation
Solution Approach 1:
The patent segments the reference signal resources into separate downlink and uplink reference signal resources, allowing independent measurement and reporting of data channel and interference channel qualities. This segmentation enables the system to handle full-duplex interference by treating downlink and uplink channels separately while still achieving full-duplex operational benefits.
2Measurement precision
If traditional CSI reporting methods are used in full-duplex systems, then device complexity is reduced, but measurement precision deteriorates due to inability to account for interference
Solution Approach 1:
The patent adds a new dimension to CSI reporting by introducing separate data channel quality and interference channel quality measurements. Instead of reporting only traditional CSI, the system now reports channel state information in multiple dimensions - the data channel dimension and the interference channel dimension - enabling more precise channel state assessment in full-duplex environments.
3Reliability
If receive beams are selected without considering interference, then ease of operation is improved, but reliability deteriorates due to suboptimal beam selection in full-duplex conditions
Solution Approach 1:
The patent implements a feedback mechanism where the UE measures both data channel quality and interference channel quality, then reports both metrics back to the network. The network uses this feedback to determine appropriate receive beams that account for interference conditions. This feedback loop enables reliable beam selection in full-duplex systems by continuously adapting to interference patterns.
Data Source
AI summary
An improved transmission configuration indicator (TCI) state for channel state information (CSI) reporting is disclosed for full-duplex systems. In such systems, a potentially victim user equipment (UE) may receive a CSI report configuration message including at least a TCI state and a quasi-colocation (QCL) type indicator. The TCI state includes identification of at least a downlink reference signal resource and an uplink reference signal resource, while the QCL type indicator indicates a spatial relationship between the downlink and uplink reference signals. The UE may then determine a receive beam for receipt of a downlink reference signal, wherein the receive beam is determined based on the QCL type indicator. The UE generates and transmits a CSI report based on the receipt of the downlink reference signal using the determined receive beam and an interference measurement of the uplink reference signal resource.