UE Beam Tracking Interference Reporting

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Solution Overview

Problem

In wireless communication systems, especially at frequencies above 6 GHz, there is a high possibility of inter-cell interference due to the fast time variance of channels and Tx/Rx beam mismatch during beam scanning, which existing technologies fail to adequately address.

Innovation Solution

A method is introduced where a user equipment (UE) transmits an indicator to a serving base station (BS) to report Tx beam identifiers causing interference to neighboring cells, allowing the BS to adjust resource allocation and reduce interference by selectively transmitting SRS in specific beam directions, thereby minimizing inter-cell interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If beam scanning is performed frequently to track Tx/Rx beams, then beam tracking accuracy is improved, but processing overhead increases and interference to neighbor cells worsens

Engineering Contradiction:

Improvebeam tracking accuracyVSAvoidprocessing overhead

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts only the necessary beam tracking operations by identifying and reporting specific interfering Tx beam IDs to the serving BS. Instead of performing full beam scanning, the system selectively tracks only those beams that cause interference to neighbor cells, reducing processing overhead while maintaining tracking accuracy for problematic beams

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system performs partial beam tracking by focusing resources on identifying and reporting only the interfering beams rather than scanning all possible beams. This partial action approach reduces processing overhead while still achieving the necessary tracking accuracy for interference-causing beams

Inventive Principle:

Principle #16Partial or excessive action

2Reliability

If SRS transmission is performed in all beam directions for beam tracking, then beam tracking completeness is improved, but inter-cell interference increases

Engineering Contradiction:

Improvebeam tracking completenessVSAvoidinter-cell interference

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts and identifies only the specific Tx beam directions that cause interference to neighbor cells by reporting their IDs to the serving BS. SRS transmission is then performed only in non-interfering beam directions, eliminating harmful interference while maintaining complete tracking of all beams through selective reporting

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system converts the harmful interference information into beneficial knowledge by having the UE report interfering beam IDs to the serving BS. This information is then used to adjust SRS transmission, converting the previously harmful interfering beams into identifiable, manageable elements that can be excluded from SRS transmission

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If Tx beam tracking is performed to adapt to channel variations, then communication reliability is improved, but resource overhead increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidresource overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent extracts only the essential beam tracking information by reporting specific interfering Tx beam IDs to the serving BS rather than transmitting complete beam measurement data. This selective reporting reduces resource overhead while maintaining communication reliability by focusing on the beams that actually cause interference

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system performs partial beam tracking reporting by transmitting only the necessary beam ID information for interfering beams rather than complete beam measurement reports. This partial action approach reduces uplink resource overhead while still achieving the reliability needed for adaptive beam tracking

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS10506566B2Caused by transmission beam tracking of UE in wireless communication system and UE therefor

Publication Date: 2019.12.10 LG ELECTRONICS INC

AI summary

A method for reducing inter-cell interference caused by transmission (Tx) beam tracking by a user equipment (UE) in a wireless communication system comprises transmitting, to a serving base station (BS), an indicator indicating request for reporting of information about a Tx beam identifier (ID) identifying a Tx beam causing interference to a neighbor cell by transmitting sounding reference symbol (SRS) and information about a cell ID of the neighbor cell; receiving, from the serving BS, control information indicating a position of a resource for transmission of the information about the Tx beam ID and the information about the cell ID of the neighbor cell; and transmitting, to the serving BS, the information about the Tx beam ID and the information about the cell ID of the neighbor cell through the position of resource indicated by the control information.