CSI Reporting for Inactive Bandwidth Parts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reporting channel state information (CSI) for inactive bandwidth parts (BWP) without switching between active and inactive BWP, which affects the accuracy and efficiency of channel monitoring.
Innovation Solution
A method where user equipment (UE) receives CSI information and reference signals for inactive BWPs in an active BWP, allowing CSI measurement and reporting without BWP switching, using a measurement gap to optimize reporting periodicity and including CSI information in MAC-CE or DCI triggering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If BWP switching is performed to monitor CSI for inactive BWP, then CSI measurement accuracy is improved, but latency and resource usage increase
Solution Approach 1:
The system performs preliminary configuration of CSI measurement resources and parameters for inactive BWPs while the UE remains on the active BWP. This allows the UE to have measurement capabilities prepared in advance without actually switching BWPs, thus achieving accurate CSI measurement without the latency penalty of BWP switching.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network configures measurement resources and parameters that enable the UE to measure CSI for inactive BWPs while staying on the active BWP. This intermediary configuration layer allows indirect measurement without direct BWP switching, resolving the contradiction between measurement accuracy and latency.
2Loss of information
If BWP switching is performed to report CSI for inactive BWP, then CSI reporting completeness is improved, but resource usage increases
Solution Approach 1:
The patent extracts the essential function of CSI reporting for inactive BWPs from the BWP switching operation. By separating the measurement and reporting functions from the BWP switching requirement, the system can achieve complete CSI reporting for multiple BWPs without the energy cost of actually switching to each inactive BWP.
Solution Approach 2:
The active BWP is given multi-functionality by enabling it to serve as both the operational BWP for data transmission and the measurement BWP for gathering CSI information about inactive BWPs. This universal usage eliminates the need for separate BWP switching operations, reducing resource consumption while maintaining reporting completeness.
3Measurement precision
If multiple BWPs are monitored with separate CSI reporting, then channel state information accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the CSI measurement and reporting processes for multiple BWPs into a unified operation performed from the active BWP. Instead of requiring separate measurement and reporting operations for each BWP, the system combines these functions into a single coordinated process that leverages the active BWP's resources, thereby maintaining accuracy while reducing complexity.
Data Source
AI summary
Disclosed is a method for transmitting and receiving channel state information (CSI) in a wireless communication system, and an apparatus therefor. Specifically, in a method for reporting channel state information (CSI) by a user equipment (UE) in a wireless communication system, a plurality of BWPs are configured for the UE, and the plurality of BWPs include an activated first BWP and an inactivated second BWP, wherein the method may comprise the steps of: receiving, from a base station, information related to CSI for the second BWP on the first BWP; receiving a reference signal from the base station on the second BWP; performing a measurement on the basis of the reference signal; and transmitting, to the base station, CSI obtained on the basis of the measurement on the first BWP.