Semipersistent CSI Reporting via Multiple SRS Resource Sets
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Solution Overview
Problem
Current wireless communication systems face challenges in ensuring reliable channel state information (CSI) reporting, particularly in achieving high reliability through efficient communication techniques between user equipment (UE) and base stations, especially in scenarios requiring multiple antenna arrays and directional beams.
Innovation Solution
The implementation of semipersistent reporting of CSI, where the UE transmits multiple instances of CSI reports using different transmission beams and sounding reference signal (SRS) resource sets within a single period of periodic CSI reporting, activated by specific trigger conditions indicated in downlink control information (DCI), to enhance reporting reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-instance CSI report transmission is used, then device complexity is reduced, but reliability of CSI reporting deteriorates
Solution Approach 1:
The patent segments the CSI report transmission into multiple instances within a single periodic reporting window. Instead of transmitting a single CSI report, the UE transmits multiple instances (e.g., first instance, second instance) of the CSI report within the same periodic CSI reporting period, each potentially using different SRS resource sets and transmission beams. This segmentation increases reliability through diversity while maintaining structured complexity management.
Solution Approach 2:
The patent changes transmission parameters dynamically by associating different CSI report instances with different SRS resource sets. The base station configures multiple SRS resource sets with different parameters (e.g., different beams, different time/frequency resources), and the UE selects appropriate SRS resource sets for different CSI report instances based on channel conditions and beam measurements, thereby optimizing reliability through parameter variation.
2Reliability
If multiple SRS resource sets are used for CSI report transmission, then reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple SRS resource sets and their associated parameters through higher-layer signaling (RRC configuration) before actual CSI reporting occurs. The base station provides advance configuration of SRS resource sets, including their parameters and associations with CSI reporting. This preliminary configuration reduces real-time signaling overhead during periodic CSI reporting, as the UE can autonomously select from pre-configured options based on current channel conditions.
3Reliability
If multiple instances of CSI report are transmitted within a period, then reliability is improved, but transmission time increases
Solution Approach 1:
The patent employs periodic action by transmitting multiple CSI report instances within a single periodic CSI reporting period. The multiple instances are scheduled at different time points within the same reporting period, allowing the system to achieve enhanced reliability through multiple transmission opportunities while maintaining the overall periodic reporting structure. This approach optimizes time utilization by confining multiple transmissions within a defined periodic window rather than extending the reporting period.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some wireless communications systems, a user equipment (UE) may receive, from a base station, downlink control information (DCI) that activates periodic channel state information (CSI) reporting via uplink shared channel transmissions (e.g., via physical uplink shared channel (PUSCH) transmissions). The UE may then identify a trigger condition that triggers a transmission of both a first instance of a CSI report and a second instance of the CSI report within a period of the periodic CSI reporting. Based on the satisfaction of the trigger condition, the UE may transmit the first instance of the CSI report via a first uplink shared channel transmission and the second instance of the CSI report via a second uplink shared channel transmission, where both uplink channel transmissions are within the period of the periodic CSI reporting.