Relay Node Donor Selection via Frequency Separation

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Solution Overview

Problem

Existing wireless networks face challenges in minimizing interference between relay nodes and donor access nodes, particularly when the backhaul connection frequency is close to the operating frequency of the relay node, leading to service interruptions and unnecessary signaling disruptions.

Innovation Solution

A method for selecting a donor access node for a relay node based on a threshold frequency separation between the relay node's operating frequency and the backhaul frequency, allowing the relay node to attach to carriers that minimize interference, including identifying primary and secondary carriers with sufficient frequency separation to reduce interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the relay node uses a backhaul frequency close to its operating frequency, then the relay node can effectively service wireless devices, but interference is caused to either the backhaul connection or to the end-user wireless devices attached to the relay node

Engineering Contradiction:

Improveservice qualityVSAvoidinterference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by selecting and adjusting the backhaul frequency to be sufficiently separated from the relay node's operating frequency. The system identifies suitable donor access nodes based on their backhaul frequencies and chooses parameters (frequencies) that minimize interference while maintaining service quality.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If the relay node attaches to a donor access node with close frequency, then connection establishment is simplified, but service interruptions and unnecessary signaling disruptions occur

Engineering Contradiction:

Improveconnection establishmentVSAvoidconnection stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-identifying suitable donor access nodes whose backhaul frequencies are sufficiently separated from the relay node's operating frequency. This preliminary selection prevents future interference issues and connection instability before they occur.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If no frequency separation threshold is enforced, then donor access node selection is more flexible, but interference cannot be minimized and service quality deteriorates

Engineering Contradiction:

Improvedonor access node selection flexibilityVSAvoidinterference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a frequency separation threshold parameter that balances flexibility and interference mitigation. The system maintains adaptability in donor access node selection while enforcing the threshold parameter to ensure sufficient frequency separation and minimize interference.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10999748B1Donor selection for relay nodes based on frequency separation

Publication Date: 2021.05.04 SPRINT SPECTRUM LLC

AI summary

Selecting a donor access node for a relay node includes identifying operating frequencies for carriers deployed by the relay node, and determining backhaul frequencies that minimize interference with the operating frequencies, including identifying frequency bands that are separated from the one or more operating frequencies by at least a threshold amount. Primary and secondary carriers can be identified and communicated with potential donor access nodes.