CSI Reporting via Interference Measurement Resources in Control Regions
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently measuring and reporting channel state information (CSI) for the downlink control region, particularly in next-generation communication systems requiring enhanced communication capacity, low latency, and reliability, such as in 5G technology.
Innovation Solution
A method and device for efficiently measuring and reporting CSI in a wireless communication system, where user equipment (UE) measures interference through an interference measurement resource (IMR) configured in the control region and reports CSI to the base station, including information on the quality of the downlink control channel and preferred CCE aggregation levels, allowing for optimal channel quality reporting and interference coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI measurement is performed in the data region using CSI-RS, then channel quality information can be obtained, but the interference characteristics of the control region cannot be accurately reflected
Solution Approach 1:
The patent divides the interference measurement process into two separate segments: one for the data region (using CSI-RS) and one for the control region (using IMR). By configuring separate interference measurement resources in the control region, the system can independently measure and report interference characteristics specific to the control channel environment, thus resolving the information loss about control region interference.
2Measurement precision
If interference measurement resource (IMR) is configured in the control region, then control region interference can be measured, but additional signaling overhead and configuration complexity increase
Solution Approach 1:
The patent designs the IMR configuration to serve multiple functions simultaneously: it can be configured at different granularities (resource element level, resource block level, or control channel candidate level), and can be reused across different control resource sets. This multi-functional design reduces the need for separate configurations for each control channel, thereby reducing overall configuration complexity while maintaining precise interference measurement capability.
3Loss of information
If CSI is reported per control resource set or search space set, then detailed channel quality information is provided, but reporting overhead increases
Solution Approach 1:
The patent introduces dynamic reporting mechanisms where the UE can adaptively select the reporting granularity and content based on channel conditions, traffic patterns, and network requirements. The reporting can be adjusted between different levels (per control resource set, per search space set, or aggregated) to balance information detail with overhead reduction, making the system flexible rather than static.
4Reliability
If CCE aggregation level information is included in CSI report, then optimal control channel reception can be determined, but reporting complexity and processing overhead increase
Solution Approach 1:
The patent implements a partial reporting strategy where the UE reports CCE aggregation level information selectively based on specific conditions, such as when channel conditions change significantly or when requested by the network. Rather than reporting all possible aggregation level information continuously, the system uses event-triggered or on-demand reporting to reduce processing overhead while maintaining reliable control channel reception when needed.
Data Source
AI summary
A method by which a terminal reports channel state information (CSI) in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: measuring interference through an interference measurement resource (IMR) set in a control area; and reporting, to a base station, CSI for the control area on the basis of the result of the interference measurement, wherein the CSI for the control area includes information on quality of a downlink control channel set through at least one control channel element (CCE) aggregation, and the information on the quality of the downlink control channel can include information on at least one CCE aggregation level preferred by the terminal in order to receive the downlink control channel. A UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, a base station or a network.