CSI Reporting for Overlapping Subbands in CoMP Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reporting channel state information (CSI) in CoMP systems, particularly in coordinating multiple base stations and managing overlapping subbands, which affects the accuracy and efficiency of CSI measurement and reporting.
Innovation Solution
A method for a terminal to receive Synchronization Signal Blocks and System Information from multiple base stations, perform Random Access procedures, and obtain CSI configuration information for overlapping subbands, allowing it to calculate and report CSI efficiently across multiple base stations by determining valid configuration settings and transmitting CSI for overlapping and non-overlapping subbands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a terminal reports CSI for each BWP separately in a CoMP system, then the reporting process becomes simple and straightforward, but the CSI reporting overhead increases and measurement efficiency decreases due to redundant measurements on overlapping subbands
Solution Approach 1:
The patent merges the CSI measurement and reporting processes for multiple BWPs by identifying overlapping subbands between first and second BWPs. The terminal performs joint CSI measurement on these overlapping subbands and reports unified CSI results, thereby combining what would otherwise be separate measurement and reporting operations into a single efficient process.
Solution Approach 2:
The patent enables the CSI measurement mechanism to serve multiple BWPs simultaneously through the jointCSI-SubbandIndicator. A single measurement process and reporting structure is designed to handle both individual and overlapping subbands across multiple BWPs, making the CSI reporting system multi-functional rather than requiring separate dedicated processes for each BWP.
2Adaptability or versatility
If the terminal performs separate CSI measurements for first and second BWPs, then each BWP can be measured independently, but the measurement time increases and productivity decreases due to redundant measurements on overlapping subbands
Solution Approach 1:
The patent applies preliminary action by having the terminal identify overlapping subbands between first and second BWPs before performing CSI measurements. The jointCSI-SubbandIndicator is determined in advance based on the intersection of subbands, allowing the terminal to prepare a unified measurement approach that avoids redundant measurements while maintaining the ability to handle independent subband requirements.
Solution Approach 2:
The patent introduces dynamic adaptability through the jointCSI-SubbandIndicator mechanism, which can flexibly represent different subband configurations. The indicator dynamically adjusts to reflect whether subbands are overlapping or non-overlapping, allowing the measurement process to adapt its behavior based on the specific BWP configuration rather than following a fixed rigid measurement procedure.
3Adaptability or versatility
If configuration information for CSI reporting is provided for each BWP independently, then each base station can configure its own BWP parameters, but the device complexity increases due to managing multiple configuration sets
Solution Approach 1:
The patent uses a copying approach where the terminal receives configuration information for the first BWP and then determines whether to apply the same configuration to the second BWP based on the jointCSI-SubbandIndicator. Instead of independently managing completely separate configuration sets, the system copies the first BWP configuration to the second BWP when applicable, reducing configuration management complexity while preserving the ability to have independent configurations when needed.
Data Source
AI summary
A method of reporting CSI by a terminal, comprising: receiving SSB from a first and a second base station, respectively; receiving SI from the first and the second base station, respectively, based on each the SSB; performing RA procedure with the first and the second base station; receiving first configuration information related to a CSI report of a first BWP and second configuration information related to a CSI report of a second BWP from the first and the second base station, the first BWP is composed of a plurality of first subbands including at least one first subband and the second BWP is composed of a plurality of second subbands including at least one second subband; based on the at least one first second subband overlapping partially or entirely, reporting a first CSI for overlapping at least one subband to the first and the second base station.