Communication Apparatus Time Synchronization Header Modification
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Solution Overview
Problem
In synchronous image capturing systems, synchronization accuracy decreases when a synchronization slave terminal is far from the synchronization master terminal, leading to increased time errors due to frequency adjustments, and existing methods struggle to maintain synchronization when the synchronization master terminal fails.
Innovation Solution
A communication apparatus with a reception unit to receive packets from a time synchronization master, a change unit to modify header information when the initial master terminal is replaced, and a transmission unit to transmit the modified packets to other communication apparatuses, ensuring seamless synchronization even when the synchronization master terminal changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the synchronization slave terminal performs frequency adjustment for time correction when synchronization error exceeds threshold, then time synchronization accuracy is improved, but the deviation from the clock frequency of the synchronization master terminal increases
Solution Approach 1:
The invention performs preliminary actions by having the synchronization slave terminal continue transmitting synchronous packets using the adjusted clock frequency even after switching to a new synchronization master. This ensures that downstream terminals maintain synchronization continuity while the system gradually adapts to the new master, preventing sudden synchronization disruptions.
Solution Approach 2:
The invention implements dynamic frequency adjustment where the synchronization slave terminal transitions from using the master's clock frequency to using its own adjusted clock frequency gradually. The system dynamically switches between frequency sources based on synchronization needs, allowing smooth adaptation when changing synchronization masters without abrupt frequency changes that would cause large time errors.
2Stability of the object's composition
If the synchronization slave terminal continues keeping time at the adjusted clock frequency after master terminal change, then synchronization continuity is maintained, but the time error from the new synchronization master increases
Solution Approach 1:
The invention ensures continuity of useful action by maintaining the transmission of synchronous packets using the previously adjusted clock frequency after master terminal switching. This continuous transmission keeps downstream terminals synchronized while the system gradually adapts to the new master, preventing interruption in the synchronization function.
Solution Approach 2:
The system performs preliminary frequency adjustment before master switching and maintains this adjusted frequency temporarily after switching. This preliminary action prepares the system for smooth transition and prevents sudden time errors that would occur if the slave terminal immediately adopted the new master's frequency without gradual adaptation.
3Reliability
If the synchronization slave terminal switches to a new synchronization master terminal, then synchronization reliability is improved, but the time error increases during the transition period
Solution Approach 1:
The invention implements dynamic transition management where the synchronization slave terminal gradually shifts from the old master's frequency to the new master's frequency. The system dynamically adjusts the clock frequency used for packet transmission, starting with the previously adjusted frequency and gradually incorporating the new master's timing information, thereby minimizing time errors during the transition while ensuring reliability.
Data Source
AI summary
A communication apparatus includes a reception unit configured to receive a predetermined packet from a time synchronization master terminal, a change unit configured to, in a case where the reception unit is not able to receive the predetermined packet within a predetermined time, change header information included in a predetermined packet transmitted by and received from a terminal newly becoming a time synchronization master to header information included in the predetermined packet received from the initial time synchronization master terminal, and a transmission unit configured to transmit the predetermined packet including the header information changed by the change unit to a second communication apparatus.