Channel State Information Feedback Timing in MIMO Systems
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Solution Overview
Problem
Existing wireless communication systems, particularly in MIMO environments, face challenges in effectively transmitting channel state information (CSI) for high-performance beamforming and precoding, as current strategies often transmit a single CSI report per periodicity or upon triggering, which does not meet the requirements of next-generation wireless systems.
Innovation Solution
The proposed solution involves implementing multiple transmissions and receptions of CSI reports, with adjustable timing based on time gaps and timeslots, including repetition transmissions for aperiodic and semi-persistent CSI, and encoding methods for improved resource mapping and collision handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single CSI report is transmitted per periodicity or upon triggering, then the transmission overhead is reduced, but the reliability and effectiveness of CSI feedback deteriorates
Solution Approach 1:
The CSI feedback is divided into multiple transmission occasions within a periodicity, allowing the CSI report to be segmented across different time instances. This segmentation improves reliability through repeated transmissions while managing overhead by distributing rather than concentrating the feedback burden.
Solution Approach 2:
The patent implements periodic CSI transmissions with configurable periodicities and time gaps between adjacent transmission occasions. This periodic action ensures that CSI feedback is reliably delivered through multiple opportunities while maintaining controlled overhead through systematic scheduling.
2Reliability
If multiple CSI transmissions are implemented, then the CSI feedback reliability is improved, but the system complexity increases
Solution Approach 1:
The patent introduces dynamic and configurable parameters for CSI transmission, including adjustable periodicities, time gaps between occasions, and offsets. This dynamic configuration allows the system to adapt the transmission schedule to channel conditions and requirements, improving reliability while managing complexity through flexible rather than fixed timing arrangements.
Solution Approach 2:
The system employs parameter changes to control transmission timing, including periodicity values, time gap durations, and slot offsets. By changing these parameters based on system requirements, the patent achieves reliable CSI feedback while managing device complexity through standardized parameter sets and configuration mechanisms.
3Reliability
If repeated CSI transmissions are performed, then the downlink transmission performance is enhanced, but the time resources consumed increase
Solution Approach 1:
The patent ensures continuous useful action by scheduling CSI transmissions across multiple occasions within a periodicity, maintaining an ongoing feedback mechanism rather than intermittent reporting. This continuity enhances downlink performance through consistent CSI availability while managing time resources through structured periodicity rather than continuous transmission.
Solution Approach 2:
By implementing periodic CSI transmissions with configurable periodicities and time gaps, the patent balances the need for repeated feedback with time resource constraints. The periodic structure ensures useful action continues reliably while allowing time for other communications between transmission occasions.
Data Source
AI summary
Disclosed are methods, systems and devices for channel state information feedback to facilitate, for example, high-performance beamforming or precoding in multiple input multiple output (MIMO) systems. One example method includes performing multiple transmissions of a channel measurement report on multiple transmission occasions. Another example method includes performing multiple receptions of a channel measurement report on multiple reception occasions, where the multiple receptions at a network node correspond to multiple transmissions from a wireless device. In both exemplary methods, a timing of the multiple transmissions is based on at least one of a number of the multiple transmission occasions, a time gap between adjacent transmission occasions of the multiple transmission occasions, and one or more timeslots that include the multiple transmission occasions.