Ethernet Remote Radio Head Synchronization for Noise Reduction
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Solution Overview
Problem
Existing LTE network implementations face challenges in reducing noise in environments with multiple remote radio heads (RRHs) due to the requirement of expensive dark fiber cable connections between baseband units (BBUs) and RRHs.
Innovation Solution
Implementing Ethernet connections between BBUs and RRHs, where the BBU determines a synchronized transmission time for multiple RRHs to transmit signals to user equipment (UE) via a Fourier transform, using a precision clock and GPS for timing accuracy, eliminating the need for dark fiber cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dark fiber cable connections are used between BBUs and RRHs, then noise interference is reduced, but cost and device complexity increase
Solution Approach 1:
The patent replaces the mechanical/dark fiber cable connection system with an Ethernet-based wireless communication system. Instead of requiring physical dark fiber cables to connect BBUs and RRHs, the system uses Ethernet cables to transmit synchronization signals and control data, eliminating the complex dark fiber infrastructure while maintaining noise reduction benefits through coordinated transmission timing.
Solution Approach 2:
The patent introduces a synchronization mechanism using Ethernet-based communication as an intermediary between BBUs and RRHs. The BBU transmits synchronization information via Ethernet to RRHs, which then coordinate their transmission times accordingly. This intermediary synchronization approach enables noise reduction without requiring direct dark fiber connections between all components.
2Reliability
If multiple RRHs transmit signals simultaneously, then signal quality improves, but noise from other RRHs increases processing requirements
Solution Approach 1:
The patent applies preliminary action by having the BBU calculate and transmit synchronization information to RRHs before actual signal transmission occurs. The RRHs use this pre-transmitted synchronization data to pre-determine their optimal transmission times, allowing them to coordinate simultaneous transmissions without causing interference to each other, thus maintaining both signal quality and processing efficiency.
Solution Approach 2:
The patent implements feedback mechanisms where RRHs transmit feedback signals to the BBU about their reception status and environmental conditions. The BBU uses this feedback information to adjust synchronization parameters and transmission timing, enabling dynamic optimization of signal quality while managing processing requirements through adaptive coordination of multiple RRH transmissions.
Data Source
AI summary
Systems and methods for communicating in an Ethernet cloud radio access network are disclosed. In some implementations, a baseband unit determines a time when a plurality of remote radio heads, accessible to a user equipment, are scheduled to transmit a signal to the user equipment. The baseband unit transmits, via an Ethernet connection and in advance of the determined time, the signal and information about the determined time to each of the plurality of remote radio heads, to enable the plurality of remote radio heads to simultaneously transmit, at the determined time and via a radio connection, a Fourier transform of the signal to the user equipment.