D2D Radio Resource Management Using Angle of Arrival

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Solution Overview

Problem

Current radio resource management in Device-to-Device (D2D) communication within cellular networks faces challenges in minimizing interference between D2D and cellular communications, requiring accurate location information and complex signaling efforts, which increases overhead and may lead to sub-optimal mode selection decisions, resulting in performance degradation.

Innovation Solution

A method that determines angle information for D2D and cellular User Equipments (UEs) within a cell, assigns radio resources, and selects peer UEs based on angle information to maximize spatial separation between interferers and receivers, thereby reducing interference through sectoring and power control, while minimizing signaling overhead and improving robustness against location inaccuracies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If geo-location information is used to mitigate interference, then interference mitigation capability is improved, but positioning accuracy and computational overhead become problematic

Engineering Contradiction:

Improveinterference mitigation capabilityVSAvoidpositioning accuracy

Core Design Contradiction:

Object-affected harmful factorsVSMeasurement precision

Solution Approach 1:

The patent changes the parameter from geographical location coordinates to angle information (AoA - Angle of Arrival). This parameter transformation allows the system to maintain interference mitigation capability while avoiding the accuracy and computational issues associated with GPS-based geo-location. The base station determines angle information for C-UEs and D-UEs, and uses these angles to select peer UEs for resource sharing, thereby mitigating interference without requiring precise positioning.

Inventive Principle:

Principle #35Parameter changes

2Loss of information

If network-assisted positioning techniques are used, then signaling overhead is reduced, but positioning accuracy deteriorates

Engineering Contradiction:

Improvesignaling overheadVSAvoidpositioning accuracy

Core Design Contradiction:

Loss of informationVSMeasurement precision

Solution Approach 1:

The patent extracts only the necessary angular information from the positioning process, rather than using full geo-location data. By taking out just the angle information needed for interference mitigation and resource allocation, the system achieves accurate spatial separation without the computational overhead and accuracy issues of complete positioning systems. The base station determines angle information for UEs and uses this extracted parameter for peer UE selection.

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If D-UEs reuse radio resources of C-UEs, then spectral efficiency is improved, but mutual interference between cellular and D2D links increases

Engineering Contradiction:

Improvespectral efficiencyVSAvoidmutual interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces angular dimension information to the resource allocation process. Instead of simply reusing resources in the time-frequency domain, the system uses angle information to select peer UEs that are spatially separated. This adds a spatial dimension to resource sharing, allowing D-UE pairs to reuse C-UE resources while maintaining spectral efficiency and reducing mutual interference through angular separation.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent applies local quality by selecting peer UEs based on their specific angle information relative to the base station. Rather than uniform resource allocation, the system tailors resource sharing decisions to the local angular position of each UE pair, ensuring that only UEs with suitable angular separation share resources. This localized approach maximizes spectral efficiency while minimizing interference.

Inventive Principle:

Principle #3Local quality

4Productivity

If explicit knowledge of link characteristics is obtained for reuse mode, then system performance is improved, but measurement and signaling efforts increase

Engineering Contradiction:

Improvesystem performanceVSAvoidmeasurement and signaling efforts

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent extracts only the essential angle information needed for interference mitigation, rather than obtaining complete link characteristics. By taking out just the angular parameter, the system achieves sufficient performance improvement for reuse mode while avoiding the cumbersome measurement and signaling efforts required for full channel state information. The base station determines angle information and uses it for peer UE selection without requiring extensive CSI exchange.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS10524265B2Method and base station for managing radio resources of device-to-device communication

Publication Date: 2019.12.31 HUAWEI TECH DUESSELDORF

AI summary

The present invention relates to a radio resource management method 100 for Device-to-Device (D2D) communication in a wireless network, and to a base station 200 for performing this method 100. The method 100 initially determines 101 angle information with respect to a base station 200 for at least one Cellular User Equipment, C-UE 302, and/or at least one D2D User Equipment, D-UE 302, within at least one cell 300 of the wireless network.