MIMO CSI Feedback Using Segmented PMI Derivation
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Solution Overview
Problem
Current MIMO wireless communication systems face challenges in efficiently managing feedback and reference signal transmissions, which affect radio interface efficiency and coverage, especially with the increasing demand for mobile data traffic and new applications.
Innovation Solution
The system employs a user equipment (UE) and base station (BS) configuration that includes a transceiver and controller to derive and transmit Precoding Matrix Indicators (PMI) using non-precoded and beamformed CSI-RS resources, enabling the identification of precoder matrices based on CSI feedback, thereby enhancing channel state information processing and communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple CSI-RS resources are configured for PMI derivation, then channel state information processing capability is improved, but device complexity increases
Solution Approach 1:
The patent segments the channel state information processing into multiple distinct CSI-RS resources, each dedicated to specific PMI derivation tasks. The first and second non-precoded CSI-RS resources handle different PMI indices (i11, i12), while the beamformed CSI-RS resource handles another PMI index (i2), dividing the complex processing into manageable segments.
Solution Approach 2:
The patent creates a universal feedback mechanism where the UE derives multiple PMI indices from different CSI-RS resources and transmits them together in a single CSI feedback report. This multi-functional approach allows one feedback channel to serve multiple channel state information purposes simultaneously.
2Measurement precision
If three PMI indices are derived and transmitted in CSI feedback, then precoder matrix identification accuracy is improved, but feedback transmission overhead increases
Solution Approach 1:
The patent merges three separate PMI indices (i11, i12, i2) into a single consolidated CSI feedback transmission. Instead of sending separate feedback messages for each PMI index, the UE combines them into one feedback report, reducing the total number of transmissions while maintaining all necessary precision information.
Solution Approach 2:
The CSI feedback mechanism is designed to serve multiple functions simultaneously by carrying three different PMI indices in a single transmission, making the feedback channel universally applicable for various precoder matrix identification needs.
Data Source
AI summary
A user equipment (UE) capable of communicating with a base station includes a transceiver configured to receive a signal comprising a CSI process configuration, wherein the CSI process configuration comprises a plurality of CSI-RS resource configurations to identify CSI-RS resources, and a controller configured to derive a first PMI index, i11 utilizing a first non-precoded CSI-RS on a first non-precoded CSI-RS resource, derive a second PMI index, i12 utilizing a second non-precoded CSI-RS on a second non-precoded CSI-RS resource, derive a third PMI index, i2 utilizing a beamformed CSI-RS on a beamformed CSI-RS resource, and cause the transceiver to transmit a CSI feedback comprising the three PMI indices i11, i12 and i2 to the base station. A base station capable of communicating with UE a transmitter configured to transmit a signal comprising a CSI process configuration, wherein the CSI process configuration comprises a plurality of CSI-RS resource configurations.