Distributed Antenna System Data Transmission Overhead Reduction
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Solution Overview
Problem
Distributed antenna systems (DAS) face low transmission efficiency due to high overhead in digital interface standards like CPRI, OBSAI, and ORI, which increase data transmission capacity but reduce payload efficiency, especially when handling wideband signals and requiring multiple digital interfaces for multiple bands, providers, and MIMO support.
Innovation Solution
The system includes node units that convert digital data from base stations into DAS frame standards, using payload extractors, resamplers, and framers to reduce overhead and improve efficiency by extracting and re-framing user data and management/synchronization data, thereby optimizing data transmission in DAS networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If digital interface standards (CPRI, OBSAI, ORI) are used to interface with base station, then data transmission capacity increases, but transmission efficiency decreases due to large overhead in transmitted data frame
Solution Approach 1:
The patent extracts and removes the overhead portion from the transmitted data frame, separating it from the payload data. By taking out the overhead, the system can transmit only the essential payload information through the DAS network, thereby improving transmission efficiency while maintaining the ability to handle wideband signals and multiple bands through the extracted and reformed data.
2Quantity of substance
If sampling rate with respect to bandwidth is high and stuffing bits are added to payload portion, then data transmission capacity increases, but transmission efficiency with respect to bandwidth is lowered
Solution Approach 1:
The patent changes the sampling rate parameter and removes stuffing bits from the payload portion. By adjusting these parameters, the system maintains the necessary data transmission capacity for wideband signals while reducing the overhead that causes bandwidth inefficiency, thus improving transmission efficiency with respect to bandwidth utilization.
3Quantity of substance
If line coding such as 8B10B is applied, then data transmission capacity increases, but transmission efficiency is lowered
Solution Approach 1:
The patent extracts and removes the line coding portion (such as 8B10B) from the data transmission process in the DAS network. By taking out this inefficient coding layer, the system maintains data transmission capacity while significantly improving transmission efficiency, as the essential payload data can be transmitted without the overhead introduced by line coding.
4Adaptability or versatility
If multiple digital interfaces are employed to support multiple bands, providers, sectors, and MIMO, then system versatility increases, but transmission efficiency of data is lowered
Solution Approach 1:
The patent implements a universal data frame format that can accommodate multiple bands, providers, sectors, and MIMO configurations through a single standardized structure. This multi-functional frame format allows the system to maintain versatility while improving transmission efficiency by eliminating the need for multiple separate interface protocols and their associated overheads.
Data Source
AI summary
A distributed antenna system (DAS) according to an aspect of the inventive concept includes a first node unit for receiving first digital data in accordance with a digital interface standard from a base station, converting the first digital data into second digital data in accordance with a DAS frame standard, and a second node unit for receiving the second digital data from the first node unit, and restoring the first digital data based on the second digital data.