CSI Report Retransmission Using Partial DCI-Based Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately and efficiently transmitting Channel State Information (CSI) reports, which are crucial for network nodes to schedule transmission resources effectively.
Innovation Solution
The proposed method involves transmitting a first CSI report and a second CSI report, where the second report is a retransmission of the first, indicated by Downlink Control Information (DCI), with options for partial or complete retransmission, and utilizing hybrid automatic repeat request (HARQ) processes to improve transmission success rates and reduce payload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a CSI report is transmitted using conventional methods, then the transmission can be completed, but the success rate is low and the payload is large
Solution Approach 1:
The CSI report transmission is divided into initial transmission and retransmission phases. The DCI message is segmented to include specific indication fields (first field for CSI report indication, second field for retransmission indication) that enable selective retransmission of only necessary portions, reducing overall payload while improving reliability through targeted retransmission strategies
2Reliability
If the CSI report is retransmitted completely, then the transmission success rate improves, but the payload increases
Solution Approach 1:
Instead of complete retransmission, the system performs partial retransmission by indicating specific CSI report portions that need retransmission through DCI fields. The network device can request retransmission of only the failed or critical parts of the CSI report, achieving improved reliability without the overhead of complete payload retransmission
3Reliability
If retransmission is always performed, then the transmission success rate improves, but the transmission efficiency decreases
Solution Approach 1:
The retransmission mechanism is made dynamic through DCI indication fields that adaptively control whether retransmission occurs and what content is retransmitted. The network device dynamically decides based on channel conditions and decoding results whether to trigger retransmission and which CSI report portions to retransmit, optimizing the balance between reliability and transmission efficiency
Data Source
AI summary
Embodiments of the present disclosure provide methods and apparatus for transmitting CSI report. For example, a first aspect of the present disclosure provides a method performed at a terminal device, including: transmitting a first CSI report; transmitting a second CSI report; wherein at least a portion of the second CSI report is obtained based on the first CSI report. For example, a second aspect of the present disclosure provides a method performed at a terminal device, including: transmitting a first CSI report; and transmitting, to a network node, a change indicator about whether at least a portion of the first CSI report changes. According to embodiments of the present disclosure, the success rate of transmitting a CSI report may be improved and the payload for transmitting a CSI report may be reduced.