Transfer Device Unique Identifier Defragmentation
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Solution Overview
Problem
Existing frame preemption schemes incorrectly defragment fragmented frames received from multiple bridge nodes due to cyclic reuse of limited SMD-Ix and SMD-Cx values, leading to mistaken identification of fragmented frames.
Innovation Solution
A transfer device and method that includes a unique identifier added to standard service signals, allowing correct defragmentation by sorting and discarding identifiers, and using a buffer to hold signals for prioritized transmission, ensuring accurate coupling and prioritization of signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If cyclic reuse of limited SMD-Ix and SMD-Cx values is used in frame preemption scheme, then device complexity is reduced, but reliability deteriorates due to mistaken identification of fragmented frames from multiple bridge nodes
Solution Approach 1:
The patent segments the identification mechanism by introducing a unique bridge node identifier that distinguishes fragmented frames from different bridge nodes. This segmentation allows the system to maintain simple cyclic reuse of SMD-Ix and SMD-Cx values while reliably identifying the source of each fragmented frame sequence, preventing mistaken identification between parallel fragmented frame sequences from different bridge nodes.
2Speed
If Frame Preemption scheme is implemented to minimize queuing delay, then speed of priority service transmission is improved, but manufacturing precision deteriorates due to incorrect defragmentation
Solution Approach 1:
The patent introduces an intermediary identifier (bridge node identifier) that mediates between the fragmented frame segments and the defragmentation process. This intermediary allows the system to rapidly preempt and transmit priority frames while maintaining accurate defragmentation by providing unambiguous identification of which fragmented segments belong together, even when multiple bridge nodes are simultaneously transmitting fragmented frames.
Data Source
AI summary
A transfer device for coupling a priority signal and a standard signal includes a reception unit configured to receive a plurality of signals transmitted from a device connected to a path different from a forwarding path, a separation unit configured to separate the signals into the priority signal and the standard signal, an identifier reference unit configured to reference an identifier added to the standard signal, an identifier sort unit configured to sort the standard signal by the identifier, a signal coupling unit configured to couple the plurality of standard signals, a multiplexing unit configured to multiplex the priority signal and the standard signal, a priority control unit configured to determine a transfer order of the signals, a transmission unit configured to transmit the signals to a device connected to the forwarding path, an interrupt transfer processing unit configured to perform interrupt processing in a case where the priority signal arrives during transfer of the standard signal, a signal division unit configured to divide the standard signal, an identifier addition unit configured to add the identifier to the standard signal divided, and a transmission suspending unit configured to suspend transfer of the standard signal until transfer of the priority signal is completed.