Multi-Band FDD Pairing for Low-Interference Cell Communication

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Solution Overview

Problem

Existing cellular network communication systems face challenges with interference between uplink and downlink bands in frequency division duplexing (FDD), leading to reduced throughput and increased power consumption due to complex RF front-end designs and resource block constraints.

Innovation Solution

The solution involves configuring an FDD band as a set of frequency bands with sufficient frequency separation, allowing for flexible pairing of uplink and downlink bands, eliminating the need for complex RF front-end designs and enabling full bandwidth usage without resource block constraints, thereby reducing self-interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If traditional FDD band configuration is used with single frequency band, then device complexity is reduced, but interference between uplink and downlink bands increases

Engineering Contradiction:

Improveinterference between uplink and downlink bandsVSAvoidRF front-end design complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent divides a single FDD band into multiple frequency bands (e.g., Band n25 and Band n26) and flexibly pairs them for uplink and downlink transmissions. This segmentation allows sufficient frequency separation between uplink and downlink, reducing self-interference while using a simplified RF front-end design without requiring complex filtering or isolation mechanisms.

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If resource block constraints are applied to reduce self-interference, then interference is minimized, but bandwidth utilization decreases

Engineering Contradiction:

Improveself-interferenceVSAvoidbandwidth utilization

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent introduces dynamic flexibility in FDD band pairing, allowing the network to dynamically select from multiple available frequency band pairs (e.g., n25-n26, n26-n25) based on interference conditions and traffic demands. This dynamic approach enables full bandwidth utilization while maintaining low self-interference through intelligent resource allocation rather than static constraints.

Inventive Principle:

Principle #15Dynamics

3Object-affected harmful factors

If complex RF front-end designs are used to manage interference, then interference control improves, but power consumption increases

Engineering Contradiction:

Improveinterference controlVSAvoidpower consumption

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

The patent changes the fundamental parameter of frequency band configuration by introducing multi-band FDD operation with flexible pairing. This parameter change allows the system to achieve effective interference control through frequency domain separation rather than relying on complex RF front-end components, thereby reducing power consumption while maintaining interference management capabilities.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260019226A1Frequency division duplex band including multiple frequency bands of a cell

Publication Date: 2026.01.15 APPLE INC

AI summary

The present application relates to improve the data communications between a user equipment (UE) and a base station. In an example, the UE can indicate, to the base station, its support of pairing an uplink band with a downlink band to define a frequency division duplex (FDD) band. The uplink band can belong to a first frequency band, whereas the downlink band can belong to a second frequency band. The base station can configure the FDD band for the UE in association with a cell. Data communications can accordingly be performed using FDD.