Base Station Interference Feedback for Radio Terminal Channel Selection
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Solution Overview
Problem
In mobile communication systems, base stations and radio terminals using unlicensed frequency bands face interference from other operators and communication systems, leading to limited transmission opportunities and reduced reception quality due to the lack of effective clear channel determination processes.
Innovation Solution
Base stations transmit interference-related information to radio terminals and other base stations, allowing them to determine the best connection target based on interference levels and clear channel availability, thereby optimizing channel selection and reducing interference impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If base stations use unlicensed frequency bands for communication, then traffic capacity increases, but interference from other operators and communication systems increases
Solution Approach 1:
The base station measures interference levels in the unlicensed band and feeds back this information to radio terminals through downlink communication. Terminals use this feedback to determine whether to transmit uplink signals, creating a closed-loop system that adapts to interference conditions and optimizes overall communication performance
Solution Approach 2:
The base station performs preliminary interference measurement and communicates the results to terminals before terminals attempt uplink transmission. This preliminary action allows terminals to make informed decisions about transmission timing, avoiding periods of high interference and reducing wasted transmission attempts
2Productivity
If radio terminals transmit uplink signals without interference awareness, then transmission opportunities increase, but reception quality deteriorates due to interference
Solution Approach 1:
The base station provides feedback information about measured interference levels to radio terminals. Terminals use this feedback to intelligently determine transmission timing, transmitting only when interference levels are acceptable, thus maintaining both high transmission opportunities and reliable reception quality
Solution Approach 2:
Radio terminals autonomously determine their transmission timing based on interference information received from the base station. Each terminal independently makes transmission decisions without requiring complex centralized coordination, improving system efficiency while maintaining reception quality
3Ease of operation
If clear channel determination is not performed, then transmission simplicity increases, but transmission opportunities are limited due to interference
Solution Approach 1:
The base station acts as an intermediary that performs clear channel determination on behalf of terminals by measuring interference levels in the unlicensed band. It communicates these measurements to terminals, which then make transmission decisions based on the base station's measurements, simplifying terminal operations while enabling effective interference avoidance
Solution Approach 2:
The base station performs multiple functions: it serves as both the communication endpoint for downlink/uplink signals and as the clear channel determination mechanism by measuring interference levels. This multi-functionality eliminates the need for separate LBT hardware or complex terminal-based channel assessment, maintaining simplicity while enabling productive transmission
Data Source
AI summary
A base station (200) according to one embodiment uses a specific frequency band shared by a plurality of operators and/or a plurality of communication systems. The base transmit, to a radio terminal (100-1), interference-related information relating to interference detected by the base station in the specific frequency band.