Constrained Transmission Parameter Sets for Interference Cancellation

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Solution Overview

Problem

Current radio communication networks face challenges in enabling User Equipment (UE) to accurately estimate and cancel interference, particularly for Physical Downlink Shared Channel (PDSCH) interference cancellation, due to limited UE capabilities, leading to suboptimal detection performance and increased signaling overhead.

Innovation Solution

The method involves predefining constrained sets of transmission parameters for Base Stations (BS) to configure downlink transmissions, allowing UEs to identify and use these parameters for interference cancellation, reducing the need for UE to blindly estimate all transmission parameters and thereby simplifying the interference cancellation process while minimizing signaling overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If UE performs blind detection of interference estimation, then interference cancellation capability is provided, but detection accuracy is low and UE capability requirements are high

Engineering Contradiction:

Improveinterference cancellation capabilityVSAvoidinterference estimation accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The network acts as an intermediary by providing assistance information about interfering signals (modulation mode, cell ID, resource allocation) to the UE. This mediator approach enables the UE to perform interference cancellation with higher accuracy without requiring advanced blind detection capabilities, thus resolving the contradiction between providing IC capability and maintaining low UE complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The network performs preliminary actions by pre-configuring and transmitting assistance information about interfering signals before the UE performs interference cancellation. This includes providing modulation schemes, cell IDs, and resource allocation patterns in advance, allowing the UE to accurately estimate and cancel interference without complex real-time analysis.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If network provides comprehensive interference information to UE, then interference cancellation accuracy is improved, but signaling overhead increases

Engineering Contradiction:

Improveinterference estimation accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent extracts only the essential interference information needed for cancellation (modulation mode, cell ID, resource allocation) rather than transmitting complete signal details. This selective extraction approach provides sufficient accuracy for interference cancellation while minimizing signaling overhead by omitting redundant information.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The network provides partial information about interfering signals - specifically the key parameters needed for interference cancellation (modulation, cell ID, resources) without transmitting complete signal waveforms or all possible transmission parameters. This partial action approach achieves effective interference cancellation with reduced signaling burden.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If UE blindly estimates all transmission parameters, then complete interference characterization is achieved, but UE complexity and processing load increase

Engineering Contradiction:

Improveinterference cancellation performanceVSAvoidUE processing capability

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The interference estimation process is segmented into two parts: the network provides pre-processed assistance information (modulation mode, cell ID, resource allocation), and the UE performs focused estimation only on the remaining parameters. This segmentation reduces UE complexity by eliminating the need to blindly estimate all transmission parameters from scratch.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The network performs self-service by autonomously analyzing and providing interference characterization information without requiring the UE to perform complex blind detection. The network identifies interfering signals, determines their parameters, and delivers this information to the UE, thereby reducing the processing burden on UE devices.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11324012B2Interference Cancellation methods used in Base Stations and User Equipments

Publication Date: 2022.05.03 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

The present disclosure relates to a method performed by a BS for facilitating IC at a UE and an associated BS. The method includes predefining one or more sets of transmission parameters, where one or more of the transmission parameters in the one or more sets are constrained to take values from respective reduced sets of values out of the values available for the respective one or more transmission parameters, each set of the one or more sets of transmission parameters being identifiable by a unique indication. The method further includes configuring a transmission of the BS, which is to interfere downlink transmissions to the UE from a serving BS of the UE, by using one of the predefined one or more sets of transmission parameters. The present disclosure also relates to a method in a UE for IC and an associated UE.