SBFD-Aware CSI Reporting with Valid Downlink Slot Selection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently reporting channel state information (CSI) due to the complexities introduced by subband full duplex (SBFD) operations, which can result in invalid downlink slots for CSI measurement, leading to inefficiencies and wasted opportunities for CSI reporting.
Innovation Solution
A method and apparatus for determining valid downlink slots for CSI measurement by considering SBFD symbols and configuration information, ensuring that slots meet specific criteria such as not being included in measurement gaps and having minimal uplink or guard band interference, thereby enabling accurate CSI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If subband full duplex (SBFD) operations are implemented to increase spectral efficiency, then downlink capacity is improved, but the number of valid downlink slots for CSI measurement is reduced, leading to measurement inefficiency
Solution Approach 1:
The patent segments the downlink slot into different parts: SBFD symbols for downlink transmission and other symbols for CSI measurement. By segmenting the time resources, the system can simultaneously support SBFD operations for high downlink capacity while preserving specific symbols for accurate CSI measurement, thus resolving the contradiction between downlink capacity and measurement efficiency
Solution Approach 2:
The patent performs preliminary actions by pre-configuring measurement gaps and identifying valid downlink slots before actual CSI measurement occurs. The base station configures the UE with measurement gap patterns and valid slot indications in advance, allowing the UE to efficiently identify which slots are available for measurement without interfering with SBFD operations, thereby maintaining both downlink capacity and measurement efficiency
2Adaptability or versatility
If measurement gaps are introduced to enable CSI measurement during SBFD operation, then measurement capability is improved, but time loss increases due to gaps in continuous measurement
Solution Approach 1:
The patent applies local quality by making specific symbols within downlink slots available for measurement rather than introducing complete measurement gaps. The measurement capability is enhanced locally at the symbol level, where SBFD symbols are marked as unavailable for measurement while other symbols remain available. This approach provides measurement capability without requiring time loss from complete gaps
Solution Approach 2:
The patent uses configuration information as an intermediary mechanism to bridge the contradiction between measurement capability and time loss. The base station provides the UE with configuration information indicating which symbols are SBFD symbols and should not be used for measurement. This intermediary configuration allows the UE to automatically identify valid measurement slots without requiring explicit measurement gaps, thus maintaining continuous measurement capability while avoiding time loss
3Measurement precision
If all downlink slots are used for CSI measurement to maximize measurement accuracy, then measurement precision is improved, but the opportunity cost increases due to reduced downlink transmission time
Solution Approach 1:
The patent segments the downlink slot into SBFD symbols (for downlink transmission) and non-SBFD symbols (for CSI measurement). This segmentation allows the system to maximize measurement precision by using available non-SBFD symbols for accurate CSI measurement while preserving SBFD symbols for downlink transmission opportunities, thus avoiding the trade-off between measurement precision and transmission opportunities
Solution Approach 2:
The patent applies partial action by using only the necessary portion of downlink slots for CSI measurement (non-SBFD symbols) rather than all available slots. This partial measurement approach provides sufficient measurement precision for effective channel state feedback while minimizing the opportunity cost of lost downlink transmission time, achieving an optimal balance between measurement accuracy and transmission efficiency
Data Source
AI summary
A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes receiving, from a base station (BS), first configuration information indicating a resource for channel state information (CSI) reporting and second configuration information indicating a subband full duplex (SBFD) symbol in downlink symbols or flexible symbols, determining a valid downlink slot for CSI measurement based on the first configuration information and the second configuration information, determining CSI based on the determined valid downlink slot, and transmitting, to the BS, the determined CSI.