Distributed Antenna System Link-Fault Tolerance via Synchronous Ethernet
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Solution Overview
Problem
Distributed antenna systems (DAS) face disruptions and delays due to external RF signals inducing errors in Ethernet frames, leading to link performance degradation between head-end and remote units.
Innovation Solution
Implementing synchronous Ethernet frames with consistent length and bit rate allows receivers to predict the start of incoming frames, even with corrupted control fields, enabling payload extraction without re-transmission and maintaining link synchronization during interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Ethernet frames are transmitted between head-end unit and remote unit, then data communication is enabled, but external RF signals can induce errors in the Ethernet frames causing link performance degradation
Solution Approach 1:
The patent applies preliminary action by pre-synchronizing the Ethernet frames at the transmitting end before transmission. The frame synchronizer ensures that frames are transmitted with consistent timing and structure, allowing the receiving end to predict frame arrivals and maintain synchronization even when errors are induced by external RF signals. This preliminary synchronization prepares the system to withstand the harmful effects of RF interference.
2Productivity
If synchronous Ethernet frames with consistent length and bit rate are used, then receivers can predict frame start and extract payload without re-transmission, but system complexity increases due to synchronization requirements
Solution Approach 1:
The patent applies parameter changes by standardizing critical Ethernet frame parameters including fixed frame length, consistent bit rate, and regular timing intervals. These parameter changes enable the receiving end to predict frame arrivals and maintain synchronization without complex adaptive algorithms. The standardized parameters simplify the synchronization mechanism while improving productivity by eliminating re-transmissions.
3Reliability
If Ethernet frame errors are corrected through re-transmission, then data accuracy is maintained, but transmission delays increase
Solution Approach 1:
The patent applies preliminary action by implementing forward error correction and frame synchronization before transmission occurs. The system prepares redundant information and synchronization markers in advance, allowing the receiving end to detect and correct errors locally without requiring re-transmission. This maintains data accuracy while eliminating the time loss associated with re-transmission protocols.
4Reliability
If link fault tolerance is improved by using synchronous Ethernet frames, then continuous data extraction is enabled, but the system requires stricter frame formatting constraints
Solution Approach 1:
The patent applies parameter changes by establishing strict but standardized frame formatting constraints including fixed field positions, predetermined delimiters, and consistent length fields. These standardized parameters enable continuous data extraction even when errors occur, as the receiving end can reliably parse frames based on the known structure. The constraints are simplified through standardization rather than increasing complexity.
Data Source
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AI summary
Certain features relate to improving the link-fault tolerance in a distributed antenna system (DAS) by utilizing a series of synchronous Ethernet frames. A receiving remote unit or a head-end unit in the DAS can predict the start of incoming Ethernet frames based on frame information extracted from previously received Ethernet frames. For example, a remote unit can be configured to receive one or more Ethernet frames, each of the one or more Ethernet frames including a start-of-frame field. After a period of time corresponding to the frame repetition rate, the remote unit can search for an additional start-of-frame field, indicating the receipt of the next Ethernet frame. The remote unit can extract the payload data from the next Ethernet frame based on the predicted value for the additional start-of-frame field.