Interference Cancellation via Selective RB Indication

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In wireless communication, efficiently indicating resource block (RB) information of interfering user equipment (UE) to a victim UE is challenging, especially due to the large bit ratio required for RB information, which affects interference cancellation and suppression in LTE networks.

Innovation Solution

The method involves transmitting interfering resource allocation information (IRAI) through L1 signaling from a serving eNode B (eNB) to a victim UE, indicating only the interfering RBs within the victim UE's allocated bandwidth for resource allocation types of type 0, type 1, or type 2-L, and using specific indication modes such as RBG-based bitmaps, continuous localized VRB allocations, and implicit indication for multiple interfering UEs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If complete RB allocation information of interfering UE is transmitted through L1 signaling, then interference cancellation accuracy is improved, but signaling overhead increases significantly

Engineering Contradiction:

Improveinterference cancellation accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent extracts and transmits only the necessary interfering RB information (overlapping RBs between victim UE and interfering UE) rather than complete RB allocation information. This selective extraction reduces signaling overhead while maintaining sufficient accuracy for interference cancellation at the victim UE side.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies different indication approaches based on local conditions: for resource allocation types 0, 1, and 2-L, only interfering RBs within the victim UE's allocated bandwidth are indicated, while type 2-D uses a different approach. This localized adaptation optimizes the balance between accuracy and overhead for each specific scenario.

Inventive Principle:

Principle #3Local quality

2Reliability

If RB information of all interfering UEs is indicated, then interference suppression performance is improved, but detection complexity increases

Engineering Contradiction:

Improveinterference suppression performanceVSAvoiddetection complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the interference indication process by handling multiple interfering UEs through sequential or differential indication. The indication mode for at least one interfering UE depends on previously indicated UEs, allowing the victim UE to process interference information in a structured manner that reduces detection complexity while maintaining suppression performance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transmits partial RB information (only overlapping RBs) rather than complete information for all interfering UEs. This partial action approach provides sufficient information for effective interference suppression without overwhelming the victim UE's detection capabilities.

Inventive Principle:

Principle #16Partial or excessive action

3Quantity of substance

If resource allocation type information is not signaled, then signaling overhead is reduced, but compatibility across different allocation types cannot be ensured

Engineering Contradiction:

Improvesignaling overheadVSAvoidcompatibility across allocation types

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

The patent creates a universal indication framework that works across multiple resource allocation types (0, 1, 2-L, and 2-D) without requiring explicit type signaling. The same L1 signaling mechanism adapts to different allocation types through its design, ensuring broad compatibility while minimizing overhead.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent implicitly handles different resource allocation types by changing the interpretation parameters at the receiver side based on configured information rather than explicit signaling. The victim UE uses pre-configured knowledge about the interfering UE's allocation type to correctly interpret the compact RB indication, eliminating the need for additional type indication bits.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10069524B2Wireless communication method, eNodeB, and user equipment

Publication Date: 2018.09.04 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

The wireless communication method used for transmitting interfering resource allocation information (IRAI) comprises a step of transmitting the IRAI through L1 signaling from the serving eNB to the victim UE, wherein the IRAI indicates only interfering resource block (RB) allocation within the bandwidth of RBs allocated to the victim UE at least in the case that the resource allocation type of the interfering UE is type 0, type 1, or type 2-L. The resource allocation type of the interfering UE can be signaled from the serving eNB to the victim UE within the downlink control information (DCI) of the victim UE for allocating resource. The indication mode of the IRAI for at least one interfering UE among the multiple interfering UEs that belong to a same interfering cell can be dependent on those interfering UEs whose IRAI has been indicated among the multiple interfering UEs.