CSI Reporting for Multi-Base Station CoMP Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reporting channel state information (CSI) for multiple base stations, particularly in Coordinated Multi-Point (CoMP) Joint Transmission scenarios, where accurate CSI calculation and reporting are crucial for optimizing data transmission but are hindered by complex interference management and beam alignment.
Innovation Solution
A method where user equipment (UE) receives CSI report-related configuration information from multiple base stations, measures reference signals using specific reception beams, and calculates CSI by accounting for interference, allowing for accurate CSI reporting to each base station, including configurations for channel measurement and interference measurement resources, and encoding CSI for uplink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI measurement resources are configured for multiple base stations in CoMP Joint Transmission, then CSI accuracy is improved, but device complexity and interference management become more complex
Solution Approach 1:
The patent segments the CSI measurement process by configuring separate measurement resources for different base stations. Each base station's reference signals are measured independently using dedicated resources, allowing the UE to calculate CSI for each base station separately while managing interference from other base stations through configured interference measurement resources.
Solution Approach 2:
The patent applies preliminary action by pre-configuring CSI measurement resources and interference measurement resources before actual CSI reporting. The network configures the UE with specific reference signal resources and interference measurement resources in advance, enabling the UE to perform measurements and calculate CSI without real-time complex interference management during the reporting process.
2Measurement precision
If multiple reference signals are received from multiple base stations, then CSI calculation accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The patent segments the reference signal reception and processing by assigning dedicated measurement resources to each base station. The UE receives and processes reference signals from different base stations using configured resource sets, allowing independent measurement and calculation for each base station while managing the complexity through structured resource allocation.
Solution Approach 2:
The patent changes parameters by configuring specific measurement resource parameters for each base station, including resource allocation, frequency allocation, and time allocation. These parameter configurations enable the UE to efficiently process multiple reference signals by adapting to the specific resource patterns of each base station.
3Reliability
If interference measurement is performed for CSI calculation, then transmission quality is improved, but measurement and processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring interference measurement resources along with channel measurement resources. The network provides the UE with both types of resources in advance through configuration signaling, enabling the UE to perform interference measurements concurrently with channel measurements without additional time overhead during the actual CSI reporting process.
Data Source
AI summary
The present disclosure relates to a method for reporting CSI by a terminal (user equipment) supported by a plurality of base stations in a wireless communication system, the method comprising: receiving CSI report-related configuration information from at least one base station among the plurality of base stations; receiving a first reference signal via a specific reception beam from a first base station among the plurality of base stations; receiving a second reference signal via the specific reception beam from at least one base station except for the first base station among the plurality of base stations; calculating the CSI by performing measurement on the first reference signal and the second reference signal; and transmitting the CSI to the first base station, wherein the terminal may calculate the CSI by measuring, as interference, the second reference signal received via the specific reception beam.