Terminal Apparatus Power Offset Interference Cancellation

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Solution Overview

Problem

Advanced receivers in communication systems require knowledge of interference signals to mitigate interference, but this increases signaling overhead and calculation load for base stations and terminal apparatuses, especially when the base station has limited knowledge of interference signals.

Innovation Solution

A terminal apparatus and base station apparatus that use power offset information in downlink control signals to determine whether to perform interference cancellation, allowing the terminal apparatus to demodulate signals based on the power difference between its own transmit power and that of another terminal apparatus, thereby reducing unnecessary calculations and interference mitigation efforts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the base station transmits detailed interference signal information to the terminal apparatus, then interference mitigation performance is improved, but signaling overhead is increased

Engineering Contradiction:

Improveinterference mitigation performanceVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent extracts only the essential power offset information from the complete interference signal description, transmitting only this critical parameter to the terminal apparatus. This selective extraction maintains interference mitigation capability while significantly reducing signaling overhead compared to transmitting full interference signal characteristics.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent transforms the interference signal information into a simplified parameter form (power offset value) that captures the essential interference characteristic. By changing the representation from detailed signal parameters to a single power offset parameter, the system achieves effective interference mitigation with minimal signaling overhead.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the terminal apparatus performs comprehensive interference cancellation calculations, then interference mitigation performance is improved, but calculation load is increased

Engineering Contradiction:

Improveinterference mitigation performanceVSAvoidcalculation load

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies partial action by performing interference cancellation only when the power offset indicates significant interference is present. Instead of always performing comprehensive interference cancellation calculations, the system selectively applies interference mitigation based on the power offset threshold, reducing unnecessary calculation load while maintaining performance when needed.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent uses the power offset parameter to control the complexity of interference cancellation operations. By changing the power offset value and comparing it against thresholds, the system dynamically adjusts the level of interference mitigation processing required, optimizing the balance between performance and calculation load.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If interference cancellation is always performed, then frequency efficiency is improved, but unnecessary calculations increase when interference is minimal

Engineering Contradiction:

Improvefrequency efficiencyVSAvoidunnecessary calculations

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent introduces dynamic adaptation by using the power offset parameter to adjust interference cancellation operations in real-time. Instead of static always-on interference cancellation, the system dynamically activates or deactivates interference mitigation based on the received power offset value, optimizing frequency efficiency while avoiding unnecessary calculations when interference is minimal.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies partial action by performing interference cancellation only when the power offset indicates significant interference. The system selectively applies interference mitigation based on conditions, performing the action only when necessary rather than continuously, thus improving frequency efficiency without wasting resources on unnecessary calculations.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS10447320B2Terminal apparatus, base station apparatus, and communication method

Publication Date: 2019.10.15 SHARP KK

AI summary

An object is to mitigate interference by using effective knowledge or information as to an interference signal while reducing an increase in the amount of calculation. A terminal device includes a reception unit that receives downlink control information from a base station apparatus. In a case of a prescribed transmission mode, a downlink shared channel destined for the terminal apparatus is demodulated on the basis of a power offset between transmit power of the terminal apparatus and transmit power of another terminal apparatus in the downlink shared channel included in the downlink control information. Whether or not to perform interference cancellation is determined according to a value of the power offset.