Multi-RAT WTRU Reception Using O-MIMO Against Interference

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing mobile communication systems face challenges in managing interference between multiple radio access technologies (RATs) due to contention-based resource sharing and incompatible air interfaces, leading to degraded system and user throughput in overlapping coverage areas.

Innovation Solution

Implementing opportunistic MIMO (O-MIMO) techniques that leverage nearby transmission nodes of different RATs, allowing for collaborative multi-point transmission to enhance MIMO gains and improve user experience by harnessing the full potential of MIMO techniques across various radio technologies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple radio access technologies share spectrum resources in overlapping coverage areas, then spectrum utilization is improved, but inter-RAT interference increases and degrades system throughput

Engineering Contradiction:

Improvespectrum utilizationVSAvoidsystem throughput

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent converts inter-RAT interference from a harmful factor into a beneficial resource by enabling the WTRU to receive reference signals from transmission nodes of different RATs. The interfering signals are repurposed as additional signal sources for MIMO operations, transforming the interference problem into an opportunity for enhanced throughput through multi-point reception and processing.

Inventive Principle:

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

2Productivity

If WTRU receives reference signals from multiple RATs simultaneously, then MIMO gains are enhanced, but signal processing complexity increases

Engineering Contradiction:

ImproveMIMO gainsVSAvoidsignal processing complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the received signal into components from different RATs using RAT-specific reference signal configurations. The WTRU processes reference signals from first RAT and second RAT separately according to their respective configurations, then combines the processed components to achieve MIMO gains while managing complexity through structured segmentation rather than monolithic processing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs different reference signal configurations for different RATs, changing parameters such as time-frequency resource allocation, signal format, and processing timing according to RAT-specific requirements. This parameter differentiation enables the WTRU to handle multiple RATs efficiently by adapting processing parameters to each RAT's characteristics.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3398258B1Handling interference in multi-rat wtru

Publication Date: 2025.11.12 INTERDIGITAL PATENT HOLDINGS INC

Figure 1A
Figure 1B
Figure 1C

AI summary

Systems, methods, and instrumentalities are disclosed for transmitting a message. For example, a first radio access technology, RAT, and/or a second RAT may be determined. The first RAT may be determined for reception of data. The second RAT may be determined for the reception of the data, perhaps for example based on an indication received via the first RAT. The data may be received via a first node associated with the first RAT and a second node associated with the second RAT.