LAA CSI Reporting Adaptation for Carrier Measurement Limits
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Solution Overview
Problem
In next-generation mobile communication systems, the existing 3GPP standard faces challenges in efficiently reporting channel status information (CSI) for License Assisted Access (LAA) cells, particularly when the number of CSI measuring processes exceeds a predetermined number, leading to insufficient CSI measurements and inability to measure CSI when the unlicensed band is occupied by IEEE 802.11 systems.
Innovation Solution
A method is proposed where the user equipment (UE) considers that a periodic CSI report is not configured for LAA cells, and if the number of CSI measuring processes equals or exceeds a predetermined number, it does not update measurements at a specific subframe, instead transmitting the CSI report from a previous subframe if a valid resource for the reference signal is available, or indicating an 'out of range' if the previous subframe is too far away.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of CSI measuring processes is increased to support more carriers in LAA, then the ability to measure CSI on more carriers is improved, but the device complexity and processing burden increase beyond what the UE can handle
Solution Approach 1:
The patent applies partial action by allowing the UE to measure CSI on only a subset of configured carriers when the total number exceeds the UE's measuring process capacity. Instead of attempting to measure all carriers simultaneously, the UE selectively measures CSI on carriers based on available measuring processes, ensuring that measurements are performed on the most important carriers while accepting that some carriers may not be measured in every subframe.
2Measurement precision
If periodic CSI reporting is configured for LAA cells, then the CSI measurement capability is improved, but the UE cannot simultaneously support more than 5 CSI processes due to standard limitations
Solution Approach 1:
The patent implements dynamics by making the CSI measurement and reporting behavior adaptive based on the number of configured carriers and available measuring processes. The UE dynamically determines which carriers to measure CSI on in each subframe, adjusting its measurement strategy based on system conditions, carrier configurations, and available processing resources, rather than following a fixed measurement pattern.
3Measurement precision
If the UE measures CSI on all configured carriers, then the CSI measurement coverage is improved, but the battery consumption and processing load increase significantly
Solution Approach 1:
The patent extracts only the essential CSI measurements needed for effective operation by allowing the UE to skip measuring CSI on carriers when measuring processes are exhausted. Instead of uniformly measuring all carriers, the system extracts and prioritizes measurements on the most critical carriers, removing unnecessary measurement overhead and reducing energy consumption while maintaining adequate CSI coverage for network operation.
Data Source
AI summary
Provided is a method for reporting channel status information (CSI) on a license assisted access (LAA) based cell, the method comprising: receiving a configuration of a CSI report; considering that a periodic CSI report is not configured for the LAA based cell although the configuration of the CSI report is received; and if the LAA based cell is configured and if the number of CSI measuring processes is equal to or greater than a predetermined number Ny at a first subframe, not updating measurement for the CSI report at the first subframe.