MAC Layer Time Stamp Generation for Transport Stream Synchronization
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Solution Overview
Problem
Existing transport stream packet transmission methods experience latency and jitter due to lack of control at the network interface, leading to complex synchronization requirements and inefficient data processing.
Innovation Solution
Implementing a method where the MAC layer generates and manages time stamps for transport stream packets, forming packet groups and MPDUs, and using these time stamps to control medium access, reducing network traffic and enabling precise synchronization without additional packet exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time synchronization is performed using additional modules in the application layer, then synchronization precision is improved, but device complexity increases
Solution Approach 1:
The patent moves the time stamp generation function from the application layer to the MAC layer, representing a dimensional shift in the network protocol stack. This allows time synchronization to be performed at a lower layer where medium access control already provides synchronized time information, eliminating the need for additional application layer modules while maintaining synchronization precision.
Solution Approach 2:
The MAC layer generates time stamps for transport stream packets using its own internal synchronized time information, without requiring external synchronization modules or additional packet exchanges. The system serves itself by utilizing the time synchronization already established for medium access control purposes.
2Reliability
If additional modules are added to perform precise synchronization, then reliability is improved, but device complexity increases
Solution Approach 1:
The MAC layer's synchronized time information, originally intended for medium access control, is repurposed to generate time stamps for transport stream packets. This multi-functional use of the same time synchronization mechanism provides reliable time stamping without requiring dedicated synchronization modules, thereby maintaining reliability while reducing complexity.
Solution Approach 2:
The system uses its own MAC layer time synchronization infrastructure to provide time stamps, eliminating the need for separate synchronization reliability mechanisms. The MAC layer serves both medium access control and time stamping functions, reducing overall system complexity while maintaining reliability.
3Ease of operation
If time synchronization is performed without MAC layer involvement, then processing simplicity is maintained, but latency and jitter occur
Solution Approach 1:
The patent shifts time stamp generation from the application layer to the MAC layer, utilizing the MAC layer's synchronized time information. This dimensional change in the protocol stack enables precise time stamping without adding complexity to upper layers, as the MAC layer already maintains synchronized time for medium access control purposes.
Solution Approach 2:
The MAC layer maintains synchronized time information in advance for medium access control, which is then reused for generating time stamps. This preliminary time synchronization performed by the MAC layer eliminates the need for additional time synchronization actions at the application layer, reducing latency and jitter while maintaining processing simplicity.
Data Source
AI summary
Provided is a method of processing and transmitting transport stream packets and processing the transmitted transport stream packets. A time stamp is generated in a medium access control (MAC) layer based on time information managed by the MAC layer, and a data frame including the transport stream packets is retransmitted based on an algorithm different from that used for a general data frame when a transmission error occurs. Therefore, there is no need to transmit and receive additional synchronization packets in order to precisely transmit the transport stream packets between transmitting and receiving terminals, and it is possible to reduce performance deterioration caused by latency and jitter.