LTE Repeater Power Regulation via Sink Signal Detection
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Solution Overview
Problem
In LTE systems, conventional repeater technologies struggle to maintain constant coverage due to varying signal intensity and interference, especially in OFDM-based systems where pilot signal detection is complex, limiting their applicability to CDMA signals.
Innovation Solution
An apparatus that regulates repeater transmission power using a reference signal like PSS or SSS, employing a sink signal detector, power measurer, and amplification controller to adjust amplifier gain based on detected signal power, ensuring constant coverage across varying bandwidths and multiple LTE signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the repeater transfers constant transmission power, then the device operation is simple, but the coverage cannot be maintained constant when signal intensity varies
Solution Approach 1:
The repeater measures the intensity of the received signal from the base station and adjusts its transmission power accordingly. This feedback mechanism ensures that when the received signal intensity varies (due to channel fading, traffic load, or number of terminals), the repeater compensates by adjusting its output power to maintain constant coverage area.
2Area of stationary object
If the repeater coverage is extended, then the service area is increased, but communication quality is degraded due to interference between adjacent coverage
Solution Approach 1:
The repeater dynamically adjusts its transmission power based on real-time measurement of received signal intensity. This dynamic control allows the coverage area to be optimized for each operating condition, preventing both excessive extension that causes interference and insufficient coverage that creates service gaps.
3Object-affected harmful factors
If the repeater coverage is reduced, then interference between adjacent coverage is minimized, but service impossible areas are generated
Solution Approach 1:
By continuously measuring the received signal intensity and adjusting transmission power in response, the repeater ensures coverage is neither too extensive (causing interference) nor too limited (creating service gaps). The feedback loop maintains coverage within optimal boundaries.
4Measurement precision
If the pilot signal detection method is used in OFDM system, then the coverage regulation is achieved, but the device complexity is increased due to scattered pilots on time/frequency
Solution Approach 1:
The invention extracts and utilizes the reference signal component from the LTE downlink signal, which contains pilot information. By measuring the intensity of this extracted reference signal, the repeater achieves coverage regulation without requiring complex pilot detection mechanisms, thus reducing device complexity while maintaining measurement precision.
Data Source
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AI summary
The present invention relates to an apparatus capable of flexibly regulating coverage of a repeater in a long term evolution system (hereinafter referred to as an LTE system). The present invention provides an apparatus for regulating transmission power of a repeater in an LTE (LONG TERM EVOLUTION) system, the apparatus including a sink signal detector that detects a sink signal of a reception signal received through an IF/RF receiver of the repeater, a sink signal power measurer that measures a size of power of the sink signal detected through the sink signal detector, and an amplification controller that calculates a gain of an amplifier of the repeater for maintaining coverage of the repeater based on the size of the power of the sink signal measured through the sink signal power measurer, and controls the amplifier of the repeater according to the calculated gain. In the present invention, in a wired or wireless repeater, it is possible to efficiently regulate the coverage of the repeater and to implement the apparatus with low complexity in the LTE system. Further, the present invention is flexibly applicable to an LTE system supporting a scalable bandwidth and it is possible to effectively regulate the coverage of multiple LTE signals using signal amplification for multiple LTE signals.