CSI Report Triggering via Downlink Grant Signaling
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently triggering channel state information (CSI) reports, particularly due to traffic collisions and desynchronization issues arising from missing downlink control information (DCI), which impact latency and reliability, especially in scenarios with disproportionate downlink traffic.
Innovation Solution
The proposed solution involves triggering CSI reports by the user equipment (UE) in response to downlink grants from the base station, with restrictions on the transmission of aperiodic CSI (A-CSI) on the physical uplink control channel (PUCCH) to prevent collisions, and utilizing duplicate CSI trigger indications to merge A-CSI with other uplink messages, ensuring accurate decoding and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple downlink grants with CSI trigger indications are transmitted to UE, then CSI reporting coverage is improved, but traffic collisions and desynchronization issues occur
Solution Approach 1:
The patent merges multiple CSI reports into a single transmission opportunity by combining them with uplink data or control information. When multiple downlink grants trigger CSI reports within the same uplink opportunity, the UE combines these reports rather than transmitting them separately, eliminating collisions while maintaining comprehensive CSI coverage.
Solution Approach 2:
The patent establishes predetermined rules for handling CSI report triggers before conflicts occur. The UE is configured with advance knowledge of how to process multiple triggers, including priority rules and combination mechanisms, which prevents desynchronization and collision issues before they manifest.
2Loss of information
If multiple CSI reports are transmitted in the same transmission opportunity, then CSI information completeness is improved, but transmission conflicts and desynchronization occur
Solution Approach 1:
The patent combines multiple CSI reports into a single multiplexed transmission when they fall within the same uplink opportunity. This merging approach preserves complete CSI information from multiple downlink grants while avoiding the transmission conflicts that would arise from separate transmissions.
Solution Approach 2:
The patent introduces an intermediary mechanism (the uplink data or control information channel) that carries multiple CSI reports simultaneously. This intermediary allows comprehensive CSI information to be transmitted without direct collision between individual CSI report transmissions.
3Object-generated harmful factors
If A-CSI transmission restrictions are implemented on PUCCH, then transmission collisions are reduced, but transmission flexibility is limited
Solution Approach 1:
The patent makes the uplink transmission channel multi-functional by allowing it to carry both original uplink data/control information and combined CSI reports simultaneously. This universal channel handles multiple functions without requiring separate dedicated channels for each type of transmission, maintaining flexibility while preventing collisions.
4Loss of time
If duplicate CSI trigger indications are used to merge A-CSI with uplink messages, then latency is reduced, but message complexity increases
Solution Approach 1:
The patent merges CSI trigger indications with regular uplink grant messages, allowing the same message to serve dual purposes: scheduling uplink transmission and triggering CSI reporting. This eliminates separate triggering messages, reducing latency while the standardized merging mechanism keeps processing complexity manageable.
Data Source
AI summary
Aspects of the present disclosure provide techniques for triggering generation and transmission of a channel state information (CSI) report by the user equipment (UE) in response to issuance of at least one downlink grant by the base station. Additionally, in order to address unique challenges that may arise with respect to traffic collisions and desynchronizations based on downlink grant CSI report triggering (e.g., missing downlink control information (DCI)), aspects of the present disclosure may further implement restrictions for transmission of aperiodic CSI (A-CSI) by the UE on physical uplink control channel (PUCCH) triggered by downlink grant. Additionally, aspects of the present disclosure provide techniques for utilizing a duplicate CSI trigger indication (e.g., indicator in downlink DCI) between multiple messages in order to signal to the UE that the transmission of A-CSI may be multiplexed or merged with another uplink message (e.g., acknowledgement).