TDD Synchronization Control for Shared-Band Interference Mitigation

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Solution Overview

Problem

The challenge of managing radio resource allocation and interference in wireless systems, particularly in environments where traditional network operators and non-network operators coexist, such as in Citizens Broadband Radio Service (CBRS), is exacerbated by the difficulty in forming agreements for time division duplex (TDD) settings, leading to increased adjacent channel interference and cross-link interference.

Innovation Solution

A communication control device that includes an acquisition unit, determination unit, and decision unit to manage synchronization and frame structures for wireless systems operating in a shared frequency band, adjusting synchronization modes and frame structures to minimize interference by aligning with existing systems.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If synchronized operation is adopted to eliminate cross-link interference, then interference between networks is reduced, but coexisting operators must constantly perform quality monitoring to maintain synchronization accuracy and cannot flexibly adjust TDD frame structures according to business models

Engineering Contradiction:

Improvecross-link interferenceVSAvoidflexibility of TDD frame structure

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent introduces a communication control device as an intermediary that centrally manages and coordinates TDD frame structures and communication directions for multiple coexisting operators. This mediator automatically adjusts frame structures according to business models while maintaining synchronization, eliminating the need for operators to perform constant quality monitoring and enabling flexible adaptation without manual intervention.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent enables dynamic adjustment of TDD frame structure parameters (such as slot configuration, communication direction ratios) according to different business models while maintaining synchronization. The communication control device modifies these parameters automatically based on service requirements, allowing operators to employ UL-heavy structures for IoT or DL-heavy structures for eMBB without sacrificing synchronization accuracy.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If unsynchronized operation is adopted to enable flexible network design and TDD frame structure tuning, then adaptability is improved, but adjacent channel interference and cross-link interference increase

Engineering Contradiction:

Improveflexibility of network designVSAvoidadjacent channel interference and cross-link interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The communication control device serves as a mediator that enables unsynchronized operation with flexible network design while preventing harmful interference. It coordinates communication directions and frame structures among operators, ensuring that even without strict synchronization, adjacent channel and cross-link interference are minimized through intelligent resource allocation and timing coordination.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If offline cooperation is performed to establish TDD settings between operators, then interference can be managed, but the complexity of coordination and agreement formation increases significantly

Engineering Contradiction:

Improveinterference managementVSAvoidcoordination complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The communication control device performs self-service by automatically managing TDD frame structures and communication directions without requiring manual offline cooperation between operators. The device independently coordinates resources, adjusts frame structures, and maintains synchronization, eliminating the complex coordination and agreement formation processes while effectively managing interference.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces the mechanical process of manual offline cooperation and agreement formation with an automated electronic control system. The communication control device uses electronic signaling and algorithms to coordinate TDD settings, substituting the cumbersome manual coordination process with efficient automated management that achieves the same interference management goals with minimal complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS12483900B2Communication control device, communication device, and communication control method

Publication Date: 2025.11.25 SONY GROUP CORP

AI summary

A communication control device according to one aspect of the present disclosure includes an acquisition unit, a determination unit, and a decision unit. The acquisition unit acquires a synchronization mode of a time division duplex related to a first wireless system. The determination unit determines whether or not interference occurs in a case where the first wireless system and a second wireless system perform wireless communication by the time division duplex in a shared frequency band The decision unit decides a synchronization mode to be used in the first wireless system on the basis of a result of the determination and a synchronization mode related to the first wireless system.