CSI-RS Port Adjustments Before Measurement to Reduce CSI Overhead
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing channel state information (CSI) overhead due to high UE processing load and complex CSI reporting, particularly with 3GPP defined Rel-17 feTypeII PS codebooks, which struggle with CSI-RS overhead and UE-specific adjustments, especially in scenarios with multiple UEs observing similar delay spreads.
Innovation Solution
Implementing UE-specific signaling from the gNB to adjust CSI-RS port signals before measurements, allowing for reduced CSI-RS overhead and more efficient CSI feedback by aligning CSI-RS ports to minimize delay spread and enable frequency flat channels, using MAC CE for adjustments and feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE-specific adjustments are applied to CSI-RS ports before measurements, then CSI feedback efficiency is improved, but UE processing complexity increases
Solution Approach 1:
The gNB applies UE-specific adjustments to CSI-RS ports before the UE performs measurements. By pre-aligning the CSI-RS ports to minimize delay spread and enable frequency flat channels in advance, the UE's measurement process is simplified, improving CSI feedback efficiency without significantly increasing UE processing complexity during the actual measurement phase.
2Loss of energy
If CSI-RS overhead is reduced, then power consumption is minimized, but measurement precision may be affected
Solution Approach 1:
The patent changes the parameter configuration of CSI-RS ports by applying UE-specific adjustments including delay compensation and frequency domain rotation. These parameter changes allow the system to reduce CSI-RS overhead and minimize power consumption while maintaining measurement precision through intelligent signal processing rather than increased signal strength.
3Adaptability or versatility
If multiple UEs observe similar delay spreads, then resource sharing is improved, but CSI reporting complexity increases
Solution Approach 1:
The patent applies UE-specific adjustments tailored to each user's channel characteristics while leveraging the observation that multiple UEs have similar delay spreads. By customizing the adjustment parameters for each UE based on their individual channel state information needs, the system enables efficient resource sharing among multiple UEs while keeping individual CSI reporting manageable through standardized processing procedures.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for reducing overhead associated with channel state information through the use of network signaled user equipment specific adjustments that can be applied by the user equipment before measurement of reference signals are provided. For example, a method can include receiving a configuration from a network and receiving reference signals from the network. The method can also include adjusting the received reference signals based on the configuration prior to performing measurements on the adjusted received reference signals. The user equipment can provide a report based on the measurements to the network.