Packet Stream Data Transmission Over Cable Infrastructure
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Solution Overview
Problem
Current cable networks face limitations in providing high-speed data connectivity and low latency for applications like video gaming and interactive television, as existing methods restrict bandwidth and lack mechanisms for real-time data delivery and error correction.
Innovation Solution
The method involves converting data into packet streams and transmitting them over a dedicated session using existing infrastructure, with CPE adapted to initiate sessions and receive high-speed data, and utilizing MPEG packets for data delivery, allowing for efficient error handling and retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing cable network infrastructure is used for data transmission, then infrastructure cost is reduced, but bandwidth and latency performance deteriorate
Solution Approach 1:
The data stream is segmented into individual packets with sequence numbers, allowing selective retransmission of only erroneous packets rather than retransmitting entire data streams. This segmentation enables efficient error correction within the existing infrastructure constraints while maintaining high throughput.
Solution Approach 2:
Error detection and correction mechanisms are built into the packet structure in advance, with checksum fields and sequence numbers pre-configured. This preliminary action allows the receiving end to identify and request retransmission of only specific erroneous packets, improving overall transmission efficiency without requiring infrastructure upgrades.
2Productivity
If dedicated sessions are established for each data transfer, then data delivery speed is improved, but network resource overhead increases
Solution Approach 1:
The packet structure is designed to be universal and reusable across different applications and data types. Each packet contains standardized fields for sequence numbering, error detection, and acknowledgment, allowing the same transmission mechanism to serve multiple purposes without requiring separate infrastructure or complex session management for each data type.
3Reliability
If error correction mechanisms are implemented, then data transmission reliability is improved, but transmission overhead increases
Solution Approach 1:
The system implements a feedback mechanism where the receiving end sends acknowledgment packets for correctly received data and requests retransmission for erroneous packets. This selective feedback approach ensures high reliability by guaranteeing accurate delivery of all packets while minimizing overhead by only retransmitting what is actually needed rather than using redundant error correction codes for all packets.
Data Source
AI summary
Methods and apparatus for delivering data over extant infrastructure within a content-based network. In one embodiment, the network comprises a cable network, and the infrastructure comprises that nominally used for on-demand (OD) services such as VOD. The method includes the allocation of dedicated end-to-end network resources via a “session request, as well as data flow control and packet size adaptation, by a data server based on feedback from the requesting/receiving client device (e.g., DSTB) within the network. Mechanisms for retransmission requests for error recovery are also provided.