UE Channel State Information Measurement Adaptation to MIMO Layers
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Solution Overview
Problem
Current wireless communication systems, particularly those employing multiple-input multiple-output (MIMO) technologies, face challenges in reducing power consumption due to the high demand for channel state information (CSI) measurements and calculations, especially when user equipment (UE) receives a large number of MIMO layers, leading to increased power consumption in the RF and baseband subsystems.
Innovation Solution
The system configures user equipment (UE) to receive a reduced number of MIMO layers by adapting the number of reception antennas and baseband processing units based on an indication of the maximum number of MIMO layers expected, allowing for optimized CSI reporting and processing, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE receives a large number of MIMO layers, then the data transmission capacity is improved, but the power consumption in RF and baseband subsystems increases
Solution Approach 1:
The patent implements dynamic adaptation of CSI measurement configuration based on the actual number of MIMO layers received. The UE dynamically adjusts the number of CSI-RS resources to measure and the CSI reports to generate, matching the current MIMO layer configuration. This dynamic adjustment allows the system to optimize power consumption by reducing CSI processing when fewer MIMO layers are active, while maintaining full capability when maximum layers are received.
2Measurement precision
If the UE performs comprehensive CSI measurements on all configured resources, then the measurement precision is improved, but the power consumption increases
Solution Approach 1:
The patent extracts and processes only the necessary subset of CSI-RS resources based on the actual MIMO layer configuration. Instead of measuring all configured CSI-RS resources, the UE identifies and measures only those resources corresponding to the active MIMO layers. This extraction approach maintains measurement precision for the relevant resources while eliminating unnecessary measurements that would consume additional power.
Solution Approach 2:
The patent implements partial action by having the UE perform CSI measurements on only a portion of the configured CSI-RS resources rather than all resources. The measurement scope is partially reduced to match the actual MIMO layer count, avoiding excessive measurements that would not contribute to current transmission performance while maintaining sufficient precision for the active layers.
3Adaptability or versatility
If the UE is configured with many CSI-RS resources, then the adaptability to different MIMO configurations is improved, but the device complexity increases
Solution Approach 1:
The patent employs dynamic configuration adaptation where the UE adjusts its CSI measurement and reporting behavior based on the current MIMO layer indication. The system maintains the capability to handle multiple configurations through dynamic adaptation rather than permanently maintaining complex processing for all possible configurations simultaneously. This reduces device complexity while preserving adaptability.
Solution Approach 2:
The patent implements a universal CSI measurement framework that can adapt to different MIMO configurations through a single flexible mechanism. Rather than implementing separate dedicated processing paths for each MIMO configuration, the system uses a universal approach that adjusts its behavior based on the current configuration indication, reducing overall device complexity while maintaining versatility.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for channel state information measurement adaptation to maximum multiple-input multiple-output layers. A method that may be performed by a user equipment (UE) includes receiving a first channel state information (CSI) report configuration including one or more first CSI reference signal (CSI-RS) resources, wherein each first CSI-RS resource comprises a first resource set; determining, based on an indication of a maximum number of multiple-input multiple-output (MIMO) layers that the UE is expected to receive, a first resource subset on which to report first CSI; and reporting the first CSI to a base station (BS), wherein the first CSI is based on the determined first resource subset.