Antenna Down Tilt Control for Mixed Wireless Networks
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Solution Overview
Problem
Current wireless network technologies face challenges in dynamically adjusting antenna down tilt to accommodate the rapid changes between broadcast/unicast single frequency and unicast multi-point transmissions, leading to suboptimal network capacity, especially in mixed coordinated/non-coordinated networks where interference and synchronization issues arise.
Innovation Solution
A method and apparatus for dynamically controlling antenna down tilt in mixed coordinated/non-coordinated networks by determining the appropriate tilt angle based on the type of waveform to be transmitted, allowing for adjustments in phase and amplitude to match the required tilt state, potentially multiple times per second, thereby optimizing network capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If down tilt is adjusted frequently to match rapid changes between broadcast/unicast single frequency and unicast multi-point transmissions, then network capacity and signal quality are improved, but device complexity and control difficulty increase
Solution Approach 1:
The patent implements dynamic down tilt adjustment where the antenna tilt angle is continuously adapted based on the current transmission mode (broadcast/unicast single frequency or unicast multi-point). The system transitions from static tilt configurations to dynamic tilt control that responds to real-time transmission requirements, enabling optimal signal distribution for each mode while maintaining manageable complexity through automated control algorithms.
Solution Approach 2:
The system changes the down tilt angle parameter according to the transmission mode. For broadcast/unicast single frequency transmissions, one specific down tilt angle is applied, while for unicast multi-point transmissions, a different down tilt angle is used. This parameter adaptation allows the system to optimize network capacity for different operational modes without requiring complex real-time optimization, simply by switching between pre-determined tilt configurations.
2Object-affected harmful factors
If down tilt angle is increased to reduce interference in unicast networks, then interference is minimized, but coverage area and signal quality for broadcast transmissions are reduced
Solution Approach 1:
The patent applies different down tilt angles for different transmission modes and geographic regions. For unicast transmissions where interference reduction is critical, a larger down tilt angle is applied to focus energy downward and reduce horizontal interference. For broadcast transmissions where coverage is paramount, a smaller down tilt angle is used to maximize coverage area. This localized quality adjustment ensures each transmission type receives the optimal tilt configuration for its specific requirements.
Solution Approach 2:
The system dynamically adjusts the down tilt angle based on the active transmission mode. When switching from unicast to broadcast mode, the down tilt angle is reduced to expand coverage area. When switching from broadcast to unicast mode, the down tilt angle is increased to minimize interference. This dynamic adaptation resolves the contradiction by allowing the system to temporarily optimize for interference reduction during unicast operations while maintaining broad coverage during broadcast operations.
3Productivity
If down tilt variation frequency is increased to match transmission mode changes, then transmission optimization is improved, but existing diurnal variation solutions become inadequate
Solution Approach 1:
The patent transitions from slow diurnal variation (changes occurring a few times per day) to rapid dynamic variation (changes occurring multiple times per second) to match the speed of transmission mode transitions between broadcast/unicast single frequency and unicast multi-point. This dynamic adaptation enables the down tilt angle to be optimized for each transmission mode in real-time, significantly improving transmission optimization while requiring a more responsive control system than traditional diurnal variation approaches.
Solution Approach 2:
The system changes the down tilt angle parameter at a frequency matched to transmission mode changes, potentially many times per second. This rapid parameter adjustment allows the network to optimize signal distribution for each transmission mode as it switches, improving overall transmission efficiency. The approach moves beyond traditional slow diurnal variation to enable real-time parameter adaptation to current operational requirements.
Data Source
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AI summary
Apparatus and methods for controlling antenna down tilt in a mixed coordinated/non-coordinated network include receiving one or more input signals defining a waveform to be transmitted, for determining a tilt angle state to be applied to the antenna based on the one or more input signals, and for transmitting a tilt control signal if the determined tilt angle state differs from a current tilt angle state associated with the antenna.