Radio Unit Near-End Crosstalk Frequency Adaptation
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Solution Overview
Problem
Crosstalk between metallic conductors in Radio over Copper (RoCU) systems and other communication systems, such as Ethernet cables, causes signal degradation due to overlapping frequency bandwidths, leading to interference and reduced signal quality.
Innovation Solution
A method and apparatus within the radio unit of a base station system that detects near-end crosstalk (NEXT) and adjusts the signal frequency range to a second range where lower NEXT is expected, thereby reducing interference and improving signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If metallic conductors are placed physically close to other cabling to provide cost-efficient distributed base station system, then device complexity and cost are reduced, but crosstalk interference increases causing signal degradation
Solution Approach 1:
The patent changes the frequency parameter of the signal transmitted over metallic conductors. When crosstalk is detected in a first frequency range, the system switches to transmitting in a second frequency range where crosstalk is lower, thereby maintaining cost-efficient cable placement while mitigating interference through frequency domain adaptation
Solution Approach 2:
The system dynamically adjusts the operating frequency range based on real-time crosstalk conditions. The baseband unit monitors interference levels and adaptively changes transmission parameters, transforming a static frequency system into a dynamic one that responds to environmental interference conditions
2Device complexity
If signal is transmitted at a fixed frequency range, then system complexity is reduced, but signal quality degrades when crosstalk occurs in that frequency range
Solution Approach 1:
The system implements dynamic frequency selection where the transmission frequency range is no longer fixed but adapts based on detected crosstalk conditions. The baseband unit switches between first and second frequency ranges to maintain signal quality, accepting increased control complexity as necessary to preserve communication reliability
Solution Approach 2:
The patent implements a feedback mechanism where the receiver detects crosstalk levels and communicates this information back to the transmitter. This feedback loop enables the system to adjust transmission frequency dynamically, using measured interference conditions to optimize signal quality while managing complexity through intelligent control
Data Source
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AI summary
Disclosed is a method performed by a radio unit (10) operable in a base station system of a wireless communication network, for reducing interference at the RU. The base station system comprises a baseband unit (30) the radio unit (10) and a plurality of radio heads (21-26) wherein the radio unit is connected to the plurality of radio heads via a number of metallic conductors (40), and wherein a signal is to be communicated to the radio unit at a first frequency range over one of the number of metallic conductors from one of the plurality of radio heads. The method comprises: detecting (206) if there is any near end crosstalk, NEXT, at a receiver of the RU, the receiver being connected to the one of the number of metallic conductors,and, when NEXT is detected, triggering (210) the one of the plurality of RHs to send the signal to be communicated over the one of the number of metallic conductors at a second frequency range different from the first frequency range where a lower NEXT is expected than at the first frequency range. Disclosed are also a corresponding radio unit and a computer program.