CSI Reporting in MBSFN Subframes via Interference Measurement Resources
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Solution Overview
Problem
In multi-node wireless communication systems, accurately reporting channel state information (CSI) between nodes and user equipment is challenging, especially when multiple nodes coordinate communication services and mutual interference needs to be managed.
Innovation Solution
A method and apparatus for determining the validity of a downlink subframe for CSI reporting based on whether an interference measurement resource is explicitly configured for the user equipment, allowing CSI to be calculated and transmitted even in multimedia broadcast single frequency network (MBSFN) subframes when such a resource is available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If CSI reporting is performed in MBSFN subframes without explicit interference measurement resource configuration, then CSI reporting coverage is improved, but measurement accuracy deteriorates due to interference from non-serving cells
Solution Approach 1:
The patent changes the parameter of subframe type utilization by enabling CSI reporting in MBSFN subframes only when explicit interference measurement resource configuration is provided. This conditional parameter change allows the system to expand CSI reporting coverage to MBSFN subframes while maintaining measurement accuracy through the presence of configured interference measurement resources that account for non-serving cell interference.
2Productivity
If multiple nodes perform cooperative communication, then system throughput is improved, but interference management complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of explicitly configured interference measurement resources that mediate between multiple cooperating nodes. These intermediary resources provide a standardized method for UEs to measure and report interference from non-serving cells, simplifying the interference management complexity while enabling cooperative communication among multiple nodes to improve system throughput.
3Power
If nodes are distributed at various locations, then transmission capacity and power efficiency are improved, but channel state reporting accuracy deteriorates due to varying interference conditions
Solution Approach 1:
The patent applies preliminary action by configuring interference measurement resources in advance before CSI reporting is performed. This preliminary configuration allows UEs to accurately measure interference conditions from non-serving cells before calculating and reporting CSI, thereby maintaining channel state reporting accuracy even when nodes are distributed at various locations with different interference environments. The preliminary setup of measurement resources compensates for the varying interference conditions caused by node distribution.
Data Source
AI summary
The user equipment and the base station according to the present invention determine differently whether a downlink subframe is a valid reference resource for a channel state information report, in accordance with whether an interference measurement resource is explicitly configured to the user equipment.