Shared Frequency Management for TDD Interference in 5G
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Solution Overview
Problem
In the 5G mobile communication system, shared frequency bands among base stations from different communication companies lead to interference issues due to mismatched downlink (DL)/uplink (UL) patterns, which are difficult to resolve using dynamic time division duplex (TDD) methods, affecting communication throughput.
Innovation Solution
A shared frequency management apparatus and method that receives application information from base stations, determines the feasibility of different TDD patterns, sets TDD patterns for each carrier frequency, and allocates the shared frequency band to prevent interference by optimizing TDD pattern allocation based on radio wave propagation loss and throughput requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier frequencies are shared by base stations from multiple communication companies using dynamic TDD method, then frequency utilization efficiency is improved, but interference among base stations occurs due to mismatched DL/UL patterns
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting TDD patterns (DL/UL configuration parameters) for each base station based on their specific geographic positions and propagation loss characteristics. The management apparatus determines appropriate TDD patterns by evaluating propagation loss between base stations and modifies the DL/UL time division parameters to prevent interference while maintaining frequency sharing.
Solution Approach 2:
The patent implements feedback mechanisms where the management apparatus receives propagation loss information from base stations, processes this feedback to determine optimal TDD patterns, and returns allocation decisions. This closed-loop feedback system enables continuous optimization of TDD pattern allocation based on actual interference conditions and propagation characteristics.
2Object-affected harmful factors
If different TDD patterns are allocated to base stations to prevent interference, then interference is reduced, but system complexity increases due to centralized management requirements
Solution Approach 1:
The patent introduces a centralized management apparatus as an intermediary between base stations. This mediator collects propagation loss information from base stations, determines optimal TDD patterns, and allocates them to prevent interference. The intermediary handles the complexity of coordination, allowing individual base stations to operate with simpler local configurations while maintaining overall system optimization.
3Object-affected harmful factors
If centralized management is implemented to coordinate TDD patterns, then interference is prevented, but information communication time increases due to additional signaling
Solution Approach 1:
The patent applies preliminary action by having base stations pre-report their propagation loss characteristics to the management apparatus before TDD pattern allocation. The management apparatus uses this advance information to determine and allocate optimal TDD patterns proactively, rather than reacting to interference issues after they occur. This preliminary coordination reduces the need for continuous real-time signaling.
Data Source
AI summary
A shared frequency management apparatus includes a communicator receiving application information regarding use of a shared frequency band from each of base stations of plural different communication companies, a determiner determining whether or not allocation of different TDD patterns during use of adjacent carrier frequencies among plural carrier frequencies included in the shared frequency band is possible on the basis of the application information from each base station, a setter setting the TDD pattern for each of the carrier frequencies on the basis of the application information from each base station and a determination result of whether or not allocation of the different TDD patterns is possible, and a decision unit deciding an allocation content of the shared frequency band to each base station, satisfying the application information from each base station, on the basis of a setting result of the TDD pattern for each carrier frequency.