Packet Header Compression via MPEG PID Indexing
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Solution Overview
Problem
Cable modem networks face challenges in reducing bandwidth as the number of cable modems increases, necessitating improved data transmission techniques to accommodate more devices effectively.
Innovation Solution
Implementing a network device with logic to receive and process data units, suppress headers, and convert IP packets into MPEG TS packets, and vice versa, using deep packet header suppression (dPHS) to reduce bandwidth requirements between the Cable Modem Termination System (CMTS) and cable modems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of cable modems in the network increases, then network capacity and user coverage are improved, but bandwidth consumption increases and system performance deteriorates
Solution Approach 1:
The patent extracts and removes redundant header information from packets transmitted in cable modem networks. By identifying and eliminating unnecessary header fields that are repeated across multiple packets, the system reduces overall bandwidth consumption while maintaining network capacity to accommodate increasing numbers of cable modems.
Solution Approach 2:
The patent changes the parameter of packet structure by modifying header compression techniques. It dynamically adjusts header fields based on packet type and network conditions, transforming fixed-size headers into variable-size compressed headers that adapt to actual data requirements, thereby reducing bandwidth consumption as network scale increases.
2Loss of energy
If conventional header compression methods are used, then some bandwidth reduction is achieved, but further compression is insufficient to accommodate growing network demands
Solution Approach 1:
The patent applies preliminary action by pre-compressing headers at the source before transmission. It performs header suppression and compression in advance at the cable modem termination system, preparing optimized packet structures beforehand rather than compressing during transmission, which achieves greater bandwidth savings and improves overall network efficiency.
Solution Approach 2:
The patent introduces an intermediary compression mechanism that sits between the cable modem termination system and cable modems. This intermediary layer performs deep packet header suppression, acting as a mediator that transforms packets into more compact forms before they traverse the network, achieving significant bandwidth reduction while maintaining network productivity.
Data Source
AI summary
A system processes data units in a network. The system receives a data unit that includes a group of headers and suppresses one or more of the headers to form a reduced data unit. The system suppresses one or more other headers of the reduced data unit to form a further reduced data unit and transmits the further reduced data unit to one or more destination devices using the program identifier (PID) field in the MPEG header as an index to suppressed headers.