User Grouping for End-to-End Precoding in Wireless Systems
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Solution Overview
Problem
In wireless communication systems incorporating artificial intelligence (AI), existing methods struggle to efficiently classify users with diverse channel distributions into manageable groups for end-to-end precoding systems, leading to an unsustainable number of parameter sets for neural network (NN) encoders and decoders.
Innovation Solution
A method and apparatus for performing signaling in user grouping for end-to-end precoding systems, where users with similar channel distributions are classified into the same group, reducing the number of parameter sets needed for NNs by determining user groups based on channel state information (CSI) and using preconfigured NN types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If users with diverse channel distributions are classified into groups for end-to-end precoding systems, then the number of parameter sets for NN encoders and decoders is reduced to a supportable level, but the complexity of user grouping and CSI-based classification increases
Solution Approach 1:
The patent segments users into multiple groups based on their channel state information (CSI) characteristics. Each group is assigned a specific NN encoder/decoder parameter set, thereby dividing the overall user population into manageable segments that can be handled with fewer parameter sets. This segmentation approach directly reduces the total number of parameter sets needed while maintaining effective precoding for each user group.
Solution Approach 2:
The patent performs preliminary user grouping based on CSI before the actual precoding operation. By pre-classifying users into groups with similar channel characteristics and assigning appropriate parameter sets in advance, the system avoids the need to manage numerous parameter sets for each individual user. This preliminary classification action simplifies subsequent precoding operations and reduces the overall parameter set complexity.
2Reliability
If user grouping based on CSI is implemented, then standard operation and efficient communication are achieved with diverse user channel distributions, but the signaling overhead for group determination and information exchange increases
Solution Approach 1:
The patent merges user grouping information with existing CSI feedback mechanisms. Instead of introducing separate signaling channels for group determination, the system integrates group identification and parameter set selection into the existing CSI reporting framework. This merging approach enables reliable user grouping and parameter set assignment while minimizing additional signaling overhead, as the group information is conveyed alongside regular CSI feedback.
3Device complexity
If the number of parameter sets for NN encoders and decoders is reduced, then the system becomes more manageable and supportable, but the precision of precoding for each individual user may be compromised
Solution Approach 1:
The patent applies local quality by assigning specific NN encoder/decoder parameter sets to each user group based on their characteristic channel conditions. Instead of using a single universal parameter set or individualized sets for each user, the system tailors parameter sets to local group characteristics. This ensures that each user group receives optimized precoding parameters suited to their channel distribution, maintaining high precoding accuracy while managing the total number of parameter sets at a supportable level.
Data Source
AI summary
According to various embodiments of the present disclosure, provided is a method of operating a terminal (user equipment, UE) in a wireless communication system comprising the steps of: receiving one or more synchronization signals from a base station (BS); receiving system information from the base station; receiving a radio resource control (RRC) message from the base station; receiving a first reference signal from the base station, the first reference signals being part of a plurality of first reference signals having an identical pattern, which are transmitted from the base station to a plurality of terminals including the terminal; transmitting a piece of first channel state information (CSI) associated with the first reference signal to the base station, the piece of first CSI being part of a plurality of pieces of first CSI that are transmitted from the plurality of terminals to the base station, on the basis of which a group is determined for each of the plurality of terminals from among a preset number of groups; receiving information about the group determined for the terminal from the base station; receiving a second reference signal from the base station on the basis of the information about the determined group, the second reference signal being part of a plurality of second reference signal that are transmitted from the base station to the plurality of terminals including the terminal; transmitting a piece of second CSI associated with the second reference signal to the base station, on the basis of the information about the determined group, the piece of second CSI being part of a plurality of pieces of second CSI associated with the plurality of second reference signals, which are transmitted from the plurality of terminals to the base station.