CPRI-PLC-Gateway Mitigates Impulsive Noise on Power Lines
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Solution Overview
Problem
The deployment of 5G communication systems faces challenges in using residential power lines as reliable media for indoor coverage due to harsh noise conditions, particularly impulsive noise, which existing noise mitigation techniques fail to effectively address.
Innovation Solution
A system and method that utilize a CPRI-PLC-Gateway (CPG) device to transmit Common Protocol Radio Interface (CPRI) frames over power lines, employing Singular Value Decomposition (SVD) and Impulsive Noise Detection and Retransmission (IND-Re) with Hybrid Automatic Repeat Request (HARQ) to compensate for noise, ensuring reliable data transmission by sensing peak-to-average power ratio (PAPR) and retransmitting frames during impulsive noise events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If power lines are used as transmission media for 5G indoor coverage, then deployment flexibility and ease of installation are improved, but transmission reliability deteriorates due to harsh noise conditions
Solution Approach 1:
The patent introduces an intermediary noise mitigation system that includes impulse detection mechanisms and retransmission protocols. This intermediary layer sits between the power line transmission medium and the data payload, detecting noise impulses and triggering retransmission when necessary, thereby resolving the contradiction between using convenient power lines and maintaining reliable transmission.
Solution Approach 2:
The system performs preliminary noise characterization and impulse detection before data transmission occurs. By预先 establishing noise thresholds and detection mechanisms, the system can proactively mitigate noise effects rather than reacting after errors occur, thus maintaining reliability while using power lines for deployment flexibility.
2Reliability
If existing noise mitigation techniques are used, then some noise protection is provided, but impulsive noise cannot be effectively addressed
Solution Approach 1:
The patent changes the detection parameter from continuous monitoring to impulse-based threshold detection. By monitoring for sudden power ratio changes rather than continuous noise levels, the system specifically targets impulsive noise characteristics, effectively addressing the harmful impulsive noise factor that existing techniques miss.
Solution Approach 2:
The system replaces traditional mechanical filtering approaches with electronic impulse detection and software-based retransmission protocols. This substitution enables more flexible and targeted mitigation of impulsive noise compared to fixed mechanical filters, effectively addressing the specific harmful factor of impulsive noise.
3Productivity
If data transmission occurs during noise events, then continuous communication is maintained, but bit error rate increases
Solution Approach 1:
The patent implements periodic noise monitoring and impulse detection during transmission. By continuously checking for noise impulses at regular intervals and triggering retransmission when detected, the system maintains communication continuity while preventing information loss from occurring in the first place.
Solution Approach 2:
The system employs feedback mechanisms where transmission status and noise detection results are continuously monitored and fed back to control retransmission decisions. This feedback loop enables the system to maintain communication continuity by rapidly detecting errors and initiating retransmission, thereby preventing permanent information loss.
Data Source
AI summary
Using residential power lines communication (PLC) as the last hop of the CPRI-based front-haul to the indoor users, where unmodified time division multiplexed (TDM) CPRI hyper-frames are transported in between the outdoor distributed unit (DU) and the indoor radio unit (RU) transparently. To countermeasure the hostile environment of power lines, proposed is a novel device, called CPRI-PLC-Gateway (CPG), which serves as an agent for creating a virtual CPRI link between the DU and RU. The proposed CPG aims to meet the desired CPRI options in the presence of the noisy PLC channel while remaining completely transparent to the CPRI protocol operation.