Terminal Apparatus Interference Cancellation Control

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Solution Overview

Problem

The transmission of information for interfering signal cancellation in wireless communication systems increases control signals, leading to a deterioration in throughput, particularly in high-density base station arrangements and MU-MIMO environments.

Innovation Solution

A terminal apparatus and base station apparatus configuration that includes a higher layer for configuring NAICS information, a receiving unit for downlink control information, and a control unit to determine whether to perform interference cancellation or suppression based on the received information, with the option to transmit or receive downlink control information containing instructions for interference cancellation or suppression in a user-specific search space.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If information on interfering signals is transmitted to terminal apparatus for cancellation or suppression, then interference cancellation capability is improved, but control signal volume increases and throughput deteriorates

Engineering Contradiction:

Improveinterference cancellation capabilityVSAvoidthroughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent extracts only the essential information needed for interference cancellation from the complete interference signal parameters. Instead of transmitting full interfering signal information, only critical elements (such as resource allocation, modulation scheme, and antenna port information) are transmitted to the terminal apparatus, reducing control overhead while maintaining cancellation effectiveness

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The interference cancellation information is segmented into multiple components: basic interference indication, resource allocation information, and optional detailed parameters. The terminal apparatus receives and processes only the necessary segments based on its configuration and current channel conditions, reducing the overall control signal burden

Inventive Principle:

Principle #1Segmentation

2Productivity

If high-density base station arrangement is implemented to increase network capacity, then network throughput is improved, but inter-cell interference increases

Engineering Contradiction:

Improvenetwork throughputVSAvoidinter-cell interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful inter-cell interference into a beneficial signal by enabling the terminal apparatus to identify and cancel interfering signals from neighboring base stations. The interfering signals, which would normally degrade performance, are instead used as known signals that can be subtracted from the received composite signal, improving overall reception quality in high-density deployments

Inventive Principle:

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

Solution Approach 2:

The system implements feedback mechanisms where base stations exchange interference coordination information and terminal apparatus feedback regarding interference cancellation effectiveness. This allows dynamic adjustment of resource allocation and transmission parameters to minimize inter-cell interference while maintaining high network capacity

Inventive Principle:

Principle #23Feedback

3Productivity

If MU-MIMO is deployed to improve throughput by spatially multiplexing multiple terminal apparatuses, then network capacity is improved, but inter-user interference increases

Engineering Contradiction:

Improvenetwork capacityVSAvoidinter-user interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent enables terminal apparatuses to cancel interfering signals from other users in the MU-MIMO group. By identifying the interfering user's signal characteristics and subtracting them from the received signal, the system converts harmful inter-user interference into a manageable component, allowing more aggressive spatial multiplexing configurations

Inventive Principle:

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

Solution Approach 2:

The system dynamically adjusts the level of interference cancellation processing based on channel conditions, terminal capabilities, and traffic requirements. When interference levels are high and terminal capability permits, more sophisticated cancellation algorithms are applied; when conditions are favorable, simpler processing suffices, optimizing the balance between throughput and complexity

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10244520B2Terminal apparatus, base station apparatus, and communication method

Publication Date: 2019.03.26 SHARP KK

AI summary

A terminal apparatus improves throughput while suppressing control information of an interfering signal. The terminal device includes: a higher layer that determines an instruction as to whether to apply NAICS; a receiving unit that receives downlink control information; and a control unit that, in a case where it has been specified on the higher layer that NAICS is applied, determines, on the basis of information that is contained in the downlink control information and indicates whether to perform interference cancellation or suppression, whether to perform interference cancellation or suppression. The receiving unit receives, in a user-specific search space, the downlink control information containing the information indicating whether to perform interference cancellation or suppression.