Sub-band Beam Reporting for Frequency Selective Scheduling

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current beam management techniques in wireless communication systems are unable to determine the optimal TRP TX beam for specific sub-bands within a system bandwidth, preventing the combination of frequency selective scheduling with TX beam selection.

Innovation Solution

The UE measures and reports preferred TRP beams for each sub-band through frequency-selective CRI reporting, with the network node configuring the beam reporting procedure and transmitting sub-band-specific reference signals, allowing for sub-link-specific beam selection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If a single CRI report is transmitted for the entire bandwidth, then the reporting overhead is reduced, but the network node cannot determine the optimal TRP TX beam for specific sub-bands

Engineering Contradiction:

Improvebeam selection informationVSAvoidbeam reporting procedure

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The system bandwidth is divided into multiple sub-bands, and the UE transmits separate CRI reports for each sub-band. This segmentation allows the network node to determine the optimal TRP TX beam for each specific sub-band, resolving the information loss problem while maintaining manageable reporting complexity through structured configuration.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different TRP TX beams are selected for different sub-bands based on local channel conditions. The UE measures reference signals in each sub-band and reports the preferred beam locally, enabling frequency-selective beam optimization rather than using a single beam for the entire bandwidth.

Inventive Principle:

Principle #3Local quality

2Productivity

If frequency selective scheduling is combined with sub-link-specific beam selection, then network capacity and coverage are improved, but the beam reporting overhead increases

Engineering Contradiction:

Improvenetwork capacityVSAvoidreporting data

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The network node pre-configures the beam reporting procedure, including sub-band definitions and reference signal assignments, before the UE performs measurements. This preliminary configuration allows efficient reporting of sub-band specific beam information without excessive overhead during actual operation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The UE measures reference signals in each sub-band and provides feedback through CRI reports indicating the preferred TRP TX beam for each sub-band. This feedback mechanism enables the network node to adapt beam selection based on actual channel conditions, improving network capacity through informed scheduling decisions.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10951297B2UE, network node and methods therein for beam reporting in a wireless communication system

Publication Date: 2021.03.16 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method performed by a User Equipment (UE) is performed. The UE obtains (202) a beam reporting configuration. The beam reporting configuration defines a beam reporting procedure for determining an optimal beam for each of different sub-bands of a system bandwidth. The UE measures (204) different reference signals transmitted by the network node. The measured different reference signals correspond to each of the different sub-bands according to the beam reporting configuration. The UE then determines (206) a preferred beam for each of the different sub-bands based on the corresponding received reference signals.