Distributed Antenna Data Transport Scrambling for Clock Synchronization
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Solution Overview
Problem
Distributed Antenna Systems (DAS) face challenges in maintaining clock timing synchronization, particularly due to the presence of long periods of weak signals in cellular data, which can lead to issues with frame synchronization and data throughput, especially during varying user traffic patterns.
Innovation Solution
The implementation of a system that includes Digital Access Units (DAUs) and Digital Remote Units (DRUs) with scramblers and descramblers to manage data transmission, using a method that involves framing, encoding, scrambling, serializing, and deserializing data to maintain synchronization across the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is transmitted over digital link in DAS, then data throughput is improved, but clock timing synchronization deteriorates due to long periods of weak signals
Solution Approach 1:
The patent applies preliminary action by performing scrambling on the data stream before transmission over the digital link. The scrambler modifies the data in advance to ensure that even during periods of weak signals, the clock timing information remains reliable. This preliminary modification prevents the clock drift issue from occurring in the first place, rather than attempting to correct it after it occurs.
Solution Approach 2:
The scrambler acts as an intermediary component between the data source and the transmission medium. It transforms the original data stream into a scrambled version that has improved timing characteristics, thereby mediating between the high data throughput requirement and the clock synchronization reliability requirement. The descrambler at the receiving end reverses this transformation to recover the original data.
2Device complexity
If network resources are sized for normal working hours, then system capacity is optimized, but performance deteriorates during lunchtime when subscribers congregate
Solution Approach 1:
The patent applies dynamics by implementing a scheduler/dispatcher that dynamically allocates network resources based on real-time traffic conditions. Instead of static resource allocation sized for normal working hours, the system adapts its resource distribution to handle varying subscriber loads, such as the congregation of subscribers during lunchtime. This dynamic approach allows the system to maintain optimal performance across different time periods without requiring excessive resources for peak conditions.
Data Source
AI summary
A system for transporting data in a Distributed Antenna System (DAS) includes at least one Digital Access Unit (DAU) and a plurality of Digital Remote Units (DRUs) coupled to the at least one DAU. The plurality of DRUs are operable to transport signals between the plurality of DRUs and the at least one DAU. The at least one DAU includes: a data transport coder comprising: a framer, an encoder, a scrambler, and a serializer and a data transport decoder comprising: a deserializer, a decoder, a descrambler, a frame synchronizer, and a deframer.