CSI Triggering Mechanism for Flexible Wireless Reporting
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Solution Overview
Problem
Current mobile communication systems face challenges in supporting high-speed data services due to resource shortages and the need for increased transfer rates, a large number of connections, very low end-to-end latency, and high energy efficiency, which existing techniques such as small cell enhancement and massive MIMO do not adequately address.
Innovation Solution
A method for dynamically performing independent CSI report triggering and CSI-RS triggering, along with designing downlink control information for flexible CSI measurement and reporting, allowing for on/off switching or swapping of links within CSI measurement configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If CSI report triggering and CSI-RS triggering are performed jointly, then system complexity is reduced, but measurement flexibility and reporting accuracy deteriorate
Solution Approach 1:
The patent divides the joint triggering mechanism into separate CSI report triggering and CSI-RS triggering processes. Each triggering can be independently controlled through separate DCI fields, allowing the network to flexibly activate CSI reporting and CSI-RS transmission according to different channel conditions and traffic requirements, thereby resolving the contradiction between system complexity and measurement flexibility.
Solution Approach 2:
The patent introduces dynamic triggering mechanisms where CSI report triggering and CSI-RS triggering can be independently activated or deactivated based on real-time channel state and network conditions. This dynamic control allows the system to adapt to varying requirements without maintaining fixed joint triggering structures, improving flexibility while managing complexity.
2Adaptability or versatility
If independent CSI report triggering and CSI-RS triggering are performed, then measurement flexibility is improved, but control signaling overhead increases
Solution Approach 1:
The patent designs DCI formats that can serve multiple functions: the same DCI structure is used for both CSI report triggering and CSI-RS triggering, and certain DCI fields can have different interpretations based on configuration. This multi-functionality reduces the need for separate dedicated signaling structures, thereby controlling overhead while maintaining independent triggering capability.
Solution Approach 2:
The patent utilizes parameter configuration and state changes to manage signaling overhead. By configuring triggering conditions, offsets, and associations through higher-layer signaling, the system can dynamically adjust when independent triggering is necessary, reducing frequent use of independent triggering mechanisms and thereby controlling overall signaling overhead.
3Measurement precision
If CSI reporting frequency is increased, then channel state accuracy is improved, but uplink resource consumption increases
Solution Approach 1:
The patent implements periodic CSI reporting mechanisms where CSI reports are transmitted at configured intervals rather than continuously. The periodicity and timing can be dynamically adjusted based on channel conditions, allowing high measurement accuracy when needed while reducing uplink resource consumption during stable channel conditions, thus resolving the contradiction between accuracy and resource usage.
Data Source
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AI summary
This specification provides a method for measuring and reporting channel state information in a wireless communication system. Specifically, a method for reporting, by a user equipment, channel state information (CSI) in a wireless communication system includes: receiving CSI configuration information related to a CSI reporting procedure; receiving one or more channel state information (CSI)-reference signals (CSI-RSs); and reporting the CSI determined by measurement values estimated by the one or more CSI-RSs, in which first triggering for transmission of the one or more CSI-RSs and second triggering for reporting of the CSI may be indicated through downlink control information.