CSI Reporting for Multi-Node Carrier Coordination
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately reporting channel state information (CSI) when multiple carriers are used or when multiple nodes coordinate to provide communication services to a user equipment (UE), as existing schemes are based on single-carrier and single-node scenarios.
Innovation Solution
The proposed solution enhances CSI reporting accuracy by configuring multiple carriers and nodes for communication, utilizing advanced CSI-RS configurations and feedback mechanisms to manage channel state information across multiple carriers and nodes, allowing for precise channel measurement and reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple carriers and nodes are configured for communication, then data throughput and channel capacity are increased, but channel state information reporting accuracy deteriorates due to complexity of existing single-carrier and single-node schemes
Solution Approach 1:
The patent segments the channel state information reporting process by introducing separate reference signal resources (CSI-RS) for different carriers and nodes. Each carrier and node can be configured with dedicated CSI-RS resources, allowing the UE to measure and report channel state information separately for each carrier-node combination, thereby maintaining accuracy in multi-carrier multi-node scenarios
Solution Approach 2:
The patent adds a new dimension to CSI reporting by introducing carrier indicators and node identifiers in the CSI report structure. This allows the UE to report channel state information for multiple carriers and nodes simultaneously by including dimensional identifiers (carrier index, node ID) along with the channel quality metrics, enabling the base station to accurately identify which carrier-node combination each measurement corresponds to
2Reliability
If multiple nodes perform cooperative communication, then signal to interference-plus-noise ratio is improved, but device complexity increases due to coordination requirements
Solution Approach 1:
The patent creates a universal CSI reporting framework that works for both single-node and multi-node scenarios. The same CSI-RS resource configuration mechanism and reporting structure are used whether one node or multiple nodes are transmitting, allowing the system to maintain consistent operation while supporting cooperative communication without requiring separate complex coordination protocols
Solution Approach 2:
The patent uses CSI-RS resources as an intermediary mechanism for multi-node coordination. By configuring dedicated CSI-RS resources for each node and having the UE measure and report on these resources, the system enables implicit coordination between nodes through the CSI feedback loop, reducing the need for explicit coordination signaling while maintaining high SINR through cooperative transmission
Data Source
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Figure 2
Figure 3(a)~3(b)
AI summary
The present invention provides a method and a device for transmitting or receiving channel state information (CSI). According to the present invention, when a user equipment can be set with one or more CSI processes per serving cell, a CSI request field included in downlink control information for a specific serving cell indicates at least whether a non-periodic CSI report triggered by the CSI request field is triggered for a set of CSI process(es) set by a higher layer from among the CSI process(es) for the one serving cell.