Base Station Beam Scheduling for Atmospheric Duct Interference
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Solution Overview
Problem
Atmospheric ducts cause significant interference to uplink channels in base station systems, particularly in TDD-LTE systems, leading to reduced access and handover success rates, and current methods like adjusting downtilt angles are costly and require manual intervention.
Innovation Solution
Implementing a method to detect and suppress beam-level interference by determining channel state information CSI beams with high interference noise power, skipping scheduling of affected beams, and using null-steering angles to optimize directivity patterns, thereby reducing atmospheric duct interference without manual adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the downtilt angle of the base station is adjusted to reduce atmospheric duct interference, then interference is reduced, but construction costs increase due to remote electrical tilt antenna replacement or manual adjustment
Solution Approach 1:
The patent changes the operational parameters of the existing antenna system by adjusting beamforming weights and selecting different CSI beams dynamically, rather than physically changing the antenna structure. This allows interference suppression through software-controlled parameter adjustments, avoiding costly hardware modifications.
Solution Approach 2:
The patent replaces the mechanical adjustment system (manual antenna tilting or remote electrical tilt mechanisms) with an electronic beamforming system. By using digital signal processing and beam selection algorithms, the system achieves directional control and interference suppression without mechanical movement or physical antenna replacement.
2Object-affected harmful factors
If manual adjustment of downtilt angle is performed to suppress interference, then atmospheric duct interference is reduced, but operator operation and maintenance burden increases
Solution Approach 1:
The patent implements self-service by enabling the base station to automatically detect atmospheric duct interference conditions and autonomously select appropriate CSI beams or adjust beamforming parameters. The system monitors channel state information and independently makes decisions to suppress interference, eliminating the need for operator intervention.
Solution Approach 2:
The patent employs feedback mechanisms where the base station continuously monitors channel state information (CSI) and interference levels, then uses this feedback to dynamically adjust beam selection and beamforming weights. This closed-loop control enables automatic adaptation to changing interference conditions without manual input.
3Object-affected harmful factors
If beam-level interference detection and suppression is implemented, then atmospheric duct interference is reduced, but system complexity increases
Solution Approach 1:
The patent segments the overall beam management process into distinct, manageable components: CSI beam determination, interference noise power measurement, threshold comparison, and selective beam scheduling. This modular approach breaks down the complex interference suppression task into simpler sub-tasks that can be executed systematically.
Solution Approach 2:
The patent applies partial action by implementing interference suppression only for specific CSI beams that exceed the interference threshold, rather than applying uniform suppression to all beams. This selective approach reduces the overall system complexity by activating suppression mechanisms only when and where needed.
Data Source
AI summary
A method includes: determining M channel state information CSI beams, where interference noise power of a DMRS pilot signal carried on each of the M CSI beams is greater than a first preset value, interference noise power of an SRS pilot signal carried on each of the M CSI beams is greater than a second preset value, the M CSI beams are same-layer beams on a horizontal plane, the same-layer beams include N CSI beams, and M and N are positive integers; and if a ratio of M to N is greater than a third preset value, skipping scheduling and sending the N CSI beams included in the same-layer beams.