Base Station Transmission Angle Control for TDD Interference
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Solution Overview
Problem
In wireless communication systems using the TDD scheme, interference between base stations due to differing transmission and reception ratios and propagation delays leads to reduced communication service areas when attempting to mitigate interference by decreasing transmission power, causing quality degradation and restricted coverage.
Innovation Solution
A transmission angle control device and method that detects interference levels between base stations and adjusts the transmission angle of the interfering base station in a vertical direction to minimize interference without reducing transmission power, allowing communication with terminal stations within the service area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmission power of a base station is decreased to reduce interference to adjacent base stations, then interference is reduced, but communication service area is restricted
Solution Approach 1:
The patent applies local quality by controlling the transmission angle of radio waves in specific directions. Instead of uniformly decreasing transmission power, the system adjusts the angular distribution of transmitted energy, directing it away from adjacent base stations while maintaining coverage in the intended service area. This is achieved through angle control units that adjust the transmission angle based on interference detection results.
Solution Approach 2:
The patent introduces a new dimension of control by adding angular control to the traditional power control approach. Rather than only adjusting transmission power (one-dimensional control), the system now controls both power and transmission angle (two-dimensional control), enabling interference reduction without sacrificing service area coverage.
2Object-affected harmful factors
If transmission power of a base station is decreased to reduce interference, then interference is reduced, but reception quality deteriorates
Solution Approach 1:
The system maintains reception quality by locally directing transmission energy toward the intended receiver area while avoiding adjacent base stations. The angle control mechanism ensures that transmitted signals maintain sufficient strength in the service area while being directed away from interfering locations, thus preserving reception quality without increasing overall transmission power.
3Area of stationary object
If base stations are located at high altitude with good view to transmit to distant places, then transmission coverage is expanded, but interference to adjacent base stations increases
Solution Approach 1:
The patent resolves this contradiction by adding angular control as a second dimension to traditional power control. High-altitude base stations can maintain their elevated position and broad coverage capability while using angle control to direct transmissions away from adjacent base stations, thus preventing interference without sacrificing coverage area.
Solution Approach 2:
The system implements local quality control by adjusting transmission angles based on the spatial relationship with adjacent base stations. This allows high-altitude base stations to maintain their coverage advantage while locally directing energy away from interfering locations, preventing the interference problem from arising in the first place.
Data Source
AI summary
A transmission angle control device in a wireless communication system based on a TDD scheme includes: an interference signal detection unit that detects a level of interference on a second base station caused by a signal transmitted by a first base station based on a received signal received from the second base station and that outputs the interference level as an interference information signal; and a transmission angle determining unit that adjusts a transmission angle of a signal transmitted by the first base station in a vertical direction according to the interference information signal.