Atmospheric Duct Interference Elimination in TDD Base Stations
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Solution Overview
Problem
In TDD systems, atmospheric ducts can cause downlink signals to maintain high strength over long distances, leading to severe interference with uplink signals at distant base stations, resulting in poor user experience and service degradation.
Innovation Solution
A communication method where the affected base station notifies the interfering base station through a core network of the atmospheric duct interference, using specific fields in messages to indicate interference, allowing for timely interference avoidance measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a guard period is set between receiving uplink signal and sending downlink signal, then interference from downlink to uplink is avoided, but transmission delay increases and productivity decreases
Solution Approach 1:
The patent dynamically adjusts the guard period duration based on detected atmospheric duct conditions. When atmospheric duct interference is detected, the guard period is extended to accommodate the delayed downlink signal arrival. When no such interference is present, the guard period is reduced to minimize transmission delays and maximize productivity.
Solution Approach 2:
The system changes the temporal parameter (guard period duration) in response to detected environmental conditions. The base station monitors for atmospheric duct effects and adjusts the guard period length accordingly, transforming a static parameter into a dynamically optimized value that balances interference avoidance with transmission efficiency.
2Area of stationary object
If downlink signal transmission distance is increased, then coverage area expands, but signal attenuation increases and reliability decreases
Solution Approach 1:
The atmospheric duct acts as an intermediary medium that enables long-distance signal transmission without significant attenuation. The patent exploits this natural atmospheric phenomenon to extend coverage area while maintaining signal strength, effectively using the duct as a waveguide that mediates between the transmitter and distant receivers.
Solution Approach 2:
The system detects changes in atmospheric conditions that indicate the presence of atmospheric ducts and adjusts transmission parameters accordingly. When a duct is detected, the system can increase transmission power or adjust modulation schemes to exploit the duct's signal-preserving properties for extended coverage.
3Area of stationary object
If downlink signal transmission distance is increased through atmospheric duct, then coverage area expands, but signal transmission delay increases and causes interference with uplink reception
Solution Approach 1:
The system dynamically monitors for atmospheric duct conditions and adjusts the guard period duration in real-time. When atmospheric duct interference is detected causing uplink signal contamination, the guard period is extended to push the downlink signal arrival outside the uplink reception window. When no such interference is present, the guard period is minimized to maintain high transmission efficiency.
Solution Approach 2:
The temporal parameter of the guard period is changed in response to detected atmospheric conditions. The system transforms the fixed guard period into a variable parameter that adapts to the presence or absence of atmospheric duct effects, thereby eliminating interference while maintaining coverage expansion benefits.
4Reliability
If base station increases transmission power to overcome attenuation, then signal strength is maintained, but energy consumption increases and harmful interference increases
Solution Approach 1:
The system adjusts transmission power dynamically based on atmospheric duct detection. When an atmospheric duct is present, the system can reduce transmission power because the duct naturally preserves signal strength over long distances. When no duct is present, normal or higher power is used to maintain coverage, thereby optimizing energy consumption while maintaining signal reliability.
Solution Approach 2:
The atmospheric duct serves as a natural signal-preserving intermediary that reduces the need for high transmission power. By exploiting the duct's waveguide properties, the system can achieve long-distance reliable transmission with lower power consumption, as the duct mediates the signal propagation and prevents natural attenuation.
5Reliability
If base station increases transmission power to overcome attenuation, then signal strength is maintained, but interference with other base stations increases
Solution Approach 1:
The system dynamically adjusts transmission power based on atmospheric duct detection. When a duct is present enabling long-distance signal preservation, the system reduces transmission power to prevent the signal from causing harmful interference to distant base stations. When no duct is present, normal power levels are used to maintain local coverage without excessive long-distance propagation.
Solution Approach 2:
The atmospheric duct acts as a selective intermediary that confines signal energy to specific propagation paths. By exploiting this natural phenomenon, the system can reduce transmission power while maintaining signal strength along the duct path, thereby reducing harmful interference to other base stations that are not aligned with the duct.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively improves the success rate of eliminating atmospheric duct interference by ensuring the interfering base station can adjust its transmission timing to avoid signal overlap, thereby enhancing service quality and user experience.
Implementation Method 1
there may be an atmospheric duct between the first base station and the second base station, and the atmospheric duct enables a downlink signal sent by the second base station to still have a relatively high signal strength when the downlink signal is transmitted in the atmospheric duct even if the downlink signal is transmitted for tens or hundreds of kilometers
Data Source
AI summary
A communication method and apparatus are disclosed. The method includes: after determining that a first base station is affected by atmospheric duct interference from a second base station, the first base station sends first information to the second base station through a core network, to notify the first base station that the first base station causes atmospheric duct interference to the second base station. After determining that the first base station is affected by the atmospheric duct interference from the second base station, the first base station notifies the second base station in a wired link manner, and may send the first information to the second base station through the core network.