MAC Frame Check Sequence Verification for Corrupted Packet Detection
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Solution Overview
Problem
Existing network interface devices lack effective mechanisms to detect and handle data packet errors due to memory corruption or logical corruption, which can lead to unreliable data transmission and inefficient retransmission processes.
Innovation Solution
The network interface device incorporates frame check sequence value checking mechanisms in the media access control layer to verify data integrity, providing indications of unexpected data and enabling early packet dropping or retransmission, thereby ensuring reliable data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frame check sequence value checking is implemented in the media access control layer, then data integrity is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by computing the frame check sequence value in advance when the data packet is initially received and stored in memory. This pre-computed FCS value is then compared against a re-computed value later, allowing error detection to occur before transmission. This resolves the contradiction by establishing reliability through advance error detection while keeping the actual transmission process simple and efficient.
2Productivity
If frame check sequence value checking is performed before transmission, then retransmission efficiency is improved, but processing time increases
Solution Approach 1:
The patent performs the frame check sequence computation and verification in advance, before the data packet is transmitted over the network. By computing the FCS value when the packet is first received and storing it alongside the packet data, the system prepares for potential error detection upfront. This allows for rapid error detection at transmission time without adding significant processing delays during the actual data transfer, thus improving retransmission efficiency while minimizing processing time impact.
Data Source
AI summary
A network interface device comprises circuitry to add a frame check sequence value a data packet to be transmitted onto a network. The data packet with the frame check sequence value is stored in memory. Media access control layer circuitry reads the data packet from the memory and determines if the frame check sequence value is correct. When it is note correct, it is determined that the data in the data packet is corrupted.