CSI Feedback Compression with Proprietary-Standardized Mapping
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Solution Overview
Problem
Existing neural network autoencoder (NNAE)-based CSI feedback solutions face challenges in multi-vendor wireless networks, particularly due to proprietary encoders and decoders that require extensive training and resource-intensive hyperparameter optimization, making them unsuitable for open systems.
Innovation Solution
The CSI compression and reporting procedure is split into a proprietary mapping at the UE and a standardized mapping, using a standardized channel feature set interface, allowing for proprietary enhancements by vendors while maintaining compatibility across different equipment suppliers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If proprietary channel quality indicators (CQIs) are used to achieve precise channel quality feedback, then measurement precision is improved, but device complexity increases due to requiring separate processing paths
Solution Approach 1:
The patent combines proprietary CQI processing and standardized CSI processing into a unified feedback mechanism. The network device configures both types of indicators to be transmitted through the same feedback resource, merging previously separate processing paths into one integrated system that reduces complexity while maintaining precision.
Solution Approach 2:
The feedback resource is designed to serve multiple functions by carrying both proprietary CQI information and standardized CSI information. This multi-functional approach allows a single transmission channel to fulfill multiple feedback requirements, eliminating the need for separate dedicated resources for each indicator type.
2Reliability
If separate feedback resources are allocated for proprietary CQIs and standardized CSIs, then reliability is improved through dedicated resources, but loss of time increases due to additional feedback transmission opportunities required
Solution Approach 1:
The patent merges the transmission of proprietary CQI and standardized CSI into a single feedback opportunity. By configuring both indicators to share the same feedback resource, the system eliminates the need for multiple separate transmission opportunities, thereby reducing time loss while maintaining reliable delivery through unified resource allocation.
3Reliability
If multiple feedback opportunities are provided for standardized CSIs, then reliability is improved, but quantity of feedback information increases leading to excessive uplink resource consumption
Solution Approach 1:
The unified feedback resource is designed to carry multiple types of feedback information simultaneously - both proprietary CQI and standardized CSI. This multi-functional capability allows the system to achieve reliable feedback transmission without requiring separate dedicated resources for each indicator type, thereby controlling the total volume of feedback information.
Data Source
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AI summary
Embodiments include methods for a radio access network (RAN) node configured to serve one or more user equipment (UEs). Such methods include transmitting reference signals (RS) for a downlink (DL) channel and receiving, from a UE, a report including encoded feedback representing the DL channel. The encoded feedback comprises a UE DL channel estimate mapped to a channel feature set based on a first mapping that is proprietary to the UE. The channel feature set is compressed based on a second mapping that is known by the UE and the RAN node. Such methods also include, using a decoder function of a neural-network autoencoder (NNAE), decoding the encoded feedback to obtain a reconstruction of the channel feature set. Other embodiments include complementary methods for a UE, as well as RAN nodes and UEs configured to perform such methods.