5G Terminal CSI Measurement Skipping Non-Active BWP
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Solution Overview
Problem
In 5G wireless communication systems, changing bandwidth parts (BWPs) can lead to difficulties in immediately measuring and reporting channel states due to the absence of channel state information for newly activated BWPs, affecting data transmission and reception efficiency.
Innovation Solution
A method and apparatus for effectively measuring and reporting channel state information (CSI) by configuring aperiodic trigger states and using downlink control information (DCI) with a CSI request field, which includes a CSI resource configuration with a BWP identifier, allowing CSI measurement and reporting even for non-active BWPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a BWP is changed to activate a new bandwidth part, then the system can support flexible bandwidth allocation and power saving, but channel state information is absent for the newly activated BWP making it difficult to immediately transmit or receive data channels
Solution Approach 1:
The patent applies preliminary action by having the terminal pre-measure channel states on CSI reference signals that are transmitted before BWP activation. When a BWP is activated, the terminal can immediately report the pre-measured CSI without needing to perform new measurements, thus resolving the contradiction between flexible bandwidth allocation and data transmission reliability.
2Measurement precision
If channel state measurement is performed after BWP activation, then the measurement is based on current channel conditions, but there is a time delay that reduces data transmission efficiency
Solution Approach 1:
The patent resolves this contradiction by performing channel state measurements in advance on CSI reference signals transmitted before BWP activation. The terminal stores these pre-measured channel states and uses them immediately upon BWP activation, eliminating the time delay while maintaining measurement precision based on current channel conditions.
3Measurement precision
If the terminal continuously monitors all configured BWPs for channel state, then accurate CSI is available for all BWPs, but power consumption increases
Solution Approach 1:
The patent applies local quality by having the terminal measure and report channel states only for specifically indicated BWPs rather than continuously monitoring all configured BWPs. The base station indicates which BWPs require CSI measurement through DCI, allowing the terminal to focus measurement resources locally on relevant BWPs, thus reducing overall power consumption while maintaining accurate CSI where needed.
Data Source
AI summary
The disclosure relates to a communication method and system for converging a 5G communication system for supporting higher data rates beyond a 4G system with a technology for IoT. The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The disclosure provides a method performed by a terminal in a wireless communication system. The method includes receiving, from a base station, information configuring a list of aperiodic trigger states for CSI; receiving, from the base station, DCI including a CSI request field, wherein each codepoint of the CSI request field is associated with one trigger state of the list and a CSI-RS is triggered based on a trigger state indicated by the CSI request field; identifying whether a BWP in which the CSI-RS is received is non-active; and in case that the BWP in which the CSI-RS is received is non-active, skipping a measurement of the CSI-RS.