NAICS Assistance Information for Interference Cancellation

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Solution Overview

Problem

In communication systems like LTE and WiMAX, terminal devices at cell or sector edges face interference from neighboring cells or sectors, leading to reduced spectral efficiency, and existing advanced receivers require significant computational load and signaling overhead to mitigate this interference.

Innovation Solution

A base station device transmits NAICS assistance information, including physical cell ID, CRS antenna ports, MBSFN subframe, and power ratios, to help terminal devices cancel or suppress interference from neighbor cells, with configuration options for primary and secondary cells in carrier aggregation scenarios.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If base station transmits interference signal information to terminal device, then interference cancellation performance is improved, but signaling overhead increases

Engineering Contradiction:

Improveinterference cancellation performanceVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The interference signal information is segmented into essential parameters (cell ID, number of antenna ports, MBSFN subframe configuration, transmission mode) that are transmitted to the terminal device, while other information is derived locally through estimation, dividing the information transmission burden

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of transmitting complete interference signal information, only partial essential parameters are transmitted to the terminal device, which then uses these parameters combined with local estimation to achieve interference cancellation, reducing signaling overhead while maintaining performance

Inventive Principle:

Principle #16Partial or excessive action

2Loss of information

If terminal device estimates interference signal information, then signaling overhead is reduced, but computational load increases

Engineering Contradiction:

Improvesignaling overheadVSAvoidcomputational load on terminal device

Core Design Contradiction:

Loss of informationVSPower

Solution Approach 1:

The base station acts as an intermediary by providing key interference parameters (cell ID, antenna ports, MBSFN configuration) that guide the terminal device's estimation process, reducing the complexity of blind estimation while maintaining accuracy

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If cellular configuration uses same frequency in neighbor cells, then spectral efficiency is improved, but inter-cell interference increases

Engineering Contradiction:

Improvespectral efficiencyVSAvoidinter-cell interference

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful inter-cell interference into a manageable parameter by providing terminal devices with interference signal information from neighbor cells, enabling the terminal to cancel or suppress the interference and thereby benefiting from frequency reuse in cellular configuration

Inventive Principle:

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

Data Source

PatentEP3179764B1Network-assisted interference cancellation and suppression (NAICS)

Publication Date: 2024.08.07 SHARP KK

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AI summary

A terminal device is provided with a receiving unit that receives NAICS assistance information from a base station device. The NAICS assistance information includes information related to a physical cell ID, information related to a number of cell-specific reference signal (CRS) antenna ports, information related to an MBSFN subframe, and information related to a transmission mode. The information related to a physical cell ID, the information related to a number of cell-specific reference signal (CRS) antenna ports, the information related to an MBSFN subframe, and the information related to a transmission mode is used to cancel or suppress interference from a neighbor cell, and is set in at least one of a primary cell and a secondary cell. The primary cell and the secondary cell are used in carrier aggregation.