Print Job Management via ID Tracking and Error Recovery
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Solution Overview
Problem
Printing systems with host devices and printers face issues where print data is lost or inconsistencies occur between the host device's job list and the printer's buffer list due to errors, leading to incomplete or redundant print jobs.
Innovation Solution
The method involves requesting printing while transmitting print data and IDs, updating the job list by deleting completed jobs, and determining if an error has been resolved to resume printing, ensuring data integrity and consistency between the host device and printer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If print data is transmitted from host device to printer without error handling, then printing operation is simple, but print data may be lost or inconsistency occurs between job lists
Solution Approach 1:
The system performs preliminary actions by transmitting job identification information along with print data before actual printing occurs. This allows the host device to track and manage print jobs proactively, enabling it to detect and handle errors before they result in data loss or inconsistency between the host and printer job lists.
Solution Approach 2:
The system implements feedback mechanisms where the printer transmits job identification information back to the host device to confirm receipt and processing status. This feedback loop enables the host device to maintain an accurate job list, detect inconsistencies, and initiate error handling procedures when necessary, thereby ensuring print data integrity without excessive complexity.
2Reliability
If error handling mechanisms are implemented to prevent data loss, then print data integrity is improved, but system complexity increases
Solution Approach 1:
The host device proactively transmits job identification information with each print job and maintains a corresponding job list before printing occurs. This preliminary tracking mechanism enables the system to detect and resolve errors in advance, ensuring consistency between the host and printer job lists without requiring complex real-time monitoring systems.
Solution Approach 2:
The system uses feedback from the printer confirming receipt of print data and job identification information to update the host device's job list. This feedback mechanism ensures that the host device can detect inconsistencies and initiate error handling procedures, maintaining print job consistency while keeping the error handling process straightforward and integrated into the normal printing workflow.
3Measurement precision
If the host device maintains a complete job list with all print data, then print job tracking is accurate, but memory usage increases
Solution Approach 1:
The system extracts and transmits only the essential job identification information from the complete print data to the printer, while the host device maintains a job list that tracks these identifiers. This extraction approach allows the host device to maintain accurate job list information without storing redundant copies of the entire print data, thereby reducing memory usage while preserving job list accuracy.
Solution Approach 2:
The host device creates and maintains a simplified copy of the job list that contains job identification information and status tracking, rather than storing complete copies of all print data. This copying mechanism enables accurate job tracking with minimal memory requirements, as the job list serves as a lightweight reference that can be updated based on feedback from the printer.
Data Source
AI summary
Disclosed herein are a method and apparatus for performing print jobs in a printing system including a host device and a printing device. The method of performing print jobs in a printing system including a host device and a printing device includes: requesting printing while transmitting print data and identifications (IDs) corresponding to one or more print jobs, included in a job list, to the printing device; if an identification (ID) corresponding to at least one completed print job is received from the printing device, updating the job list by deleting a print job corresponding to the received ID from the job list; if an error has occurred in the printing system, determining whether the error has been resolved; and if it is determined that the error has been resolved, resuming printing.