Node Indication Signaling for CSI Measurement in LTE Heterogeneous Networks
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Solution Overview
Problem
In LTE systems with multiple-stream aggregation, user equipment (UE) cannot be notified of specific radio resource sets configured on each transmission point, leading to inadequate channel state information measurement and scheduling.
Innovation Solution
The base station sends signaling with node indication information, including CSI-SubframePatternConfig-r12 and csi-MeasSubframeSet1CellId-r12, csi-MeasSubframeSet2CellId-r12 fields, to inform the UE of the configured channel state information measurement sets, enabling it to measure and provide feedback for accurate scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station configures multiple channel state information measurement sets for the UE in MSA scenario, then the scheduling accuracy and resource allocation improve, but the UE cannot be notified of the specific radio resource sets configured on each transmission point, leading to measurement imprecision
Solution Approach 1:
The patent segments the channel state information measurement configuration by introducing separate indication fields (csi-MeasSubframeSet1CellId-r12 and csi-MeasSubframeSet2CellId-r12) for different transmission points. Each measurement set is independently associated with a specific node through these segmented indication fields, allowing the UE to distinguish which measurement set corresponds to which transmission point.
Solution Approach 2:
The patent introduces node indication information as an intermediary element that bridges the gap between the base station's configuration and the UE's measurement process. This intermediary information (cell ID fields) enables the UE to correctly identify and associate measurement sets with their corresponding transmission points, resolving the information loss problem.
2Productivity
If the base station performs targeted scheduling based on measurement sets from multiple transmission points, then the resource allocation efficiency improves, but the interference management becomes more complex in heterogeneous networks
Solution Approach 1:
The patent segments interference management by creating separate measurement sets (CSI measurement sets) for different transmission points with different interference characteristics. Each set can be independently configured and measured, allowing the base station to manage interference from each transmission point separately rather than as a monolithic problem.
Solution Approach 2:
The patent applies local quality by allowing different measurement sets to have different properties (subframe patterns, cell IDs, resource configurations) tailored to the specific interference characteristics of each transmission point. This enables localized optimization of scheduling decisions for each transmission point while maintaining overall system coordination.
3Ease of operation
If the UE measures channel state information without node indication information, then the measurement process is simpler, but the base station cannot perform accurate targeted scheduling for multiple transmission points
Solution Approach 1:
The patent applies preliminary action by having the base station pre-configure and notify the UE of the node indication information (cell ID fields) before the UE performs channel state information measurement. This preliminary notification ensures that the UE has the necessary identification information ready before measurement begins, maintaining measurement simplicity while ensuring accuracy.
Data Source
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AI summary
The present invention provides a measurement method, a base station, and a user equipment. The measurement method includes: sending, by a base station, signaling to a user equipment, where the signaling carries node indication information, where the node indication information is used to indicate nodes corresponding to channel state information measurement sets configured by the base station for the user equipment. In this way, the user equipment can learn, according to the node indication information, the nodes corresponding to the channel state information measurement sets configured by the base station for the user equipment; then, the user equipment can measure the nodes corresponding to the channel state information measurement sets on the channel state information measurement sets configured by the base station for the user equipment and provide feedback, so that the base station can schedule the user equipment according to a measurement result of the user equipment.