Image Forming Apparatus Wireless Mode Switching
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Solution Overview
Problem
Existing image forming apparatuses lack the capability to efficiently switch between wireless communication modes, specifically between infrastructure mode and ad hoc mode, which limits their flexibility and convenience in wireless communication.
Innovation Solution
The image forming apparatus is equipped with a communication control unit that enables both infrastructure mode and ad hoc mode, a reception unit to receive IEEE 802.11 standard trigger frames, and transmission units to execute carrier sense and transmit data accordingly, allowing seamless operation in both modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the image forming apparatus enables both infrastructure mode and ad hoc mode simultaneously, then wireless communication flexibility is improved, but communication channel management complexity increases
Solution Approach 1:
The communication control unit dynamically switches between infrastructure mode and ad hoc mode based on operational requirements. The system can transition from infrastructure mode (using external access point) to ad hoc mode (direct peer-to-peer communication) and vice versa, making the communication architecture flexible and adaptive to different scenarios without requiring simultaneous complex management of both modes
Solution Approach 2:
The communication control unit acts as an intermediary that manages the switch between different communication modes. It receives trigger frames from the external access point in infrastructure mode, processes carrier sense information, and transitions to ad hoc mode when needed, thereby simplifying the overall system architecture by having a single control entity manage mode transitions rather than requiring parallel complex management systems
2Reliability
If the apparatus executes carrier sense before data transmission, then communication reliability is improved, but transmission time increases
Solution Approach 1:
The system performs carrier sense as a preliminary action before data transmission to detect whether the communication channel is busy. This preliminary channel assessment prevents collisions and ensures reliable transmission by verifying channel availability in advance, while the trigger frame mechanism optimizes this process by providing timely channel status information
3Adaptability or versatility
If the image forming apparatus operates as master station in ad hoc mode, then communication autonomy is improved, but channel determination complexity increases
Solution Approach 1:
The master station functionality segments the channel determination process into distinct phases: trigger frame reception, carrier sense execution, and data transmission. This segmentation simplifies the overall complexity by breaking down the autonomous channel management into manageable, sequential steps that the communication control unit can execute systematically
Data Source
AI summary
In a case where an image forming apparatus operates as a master station that determines a communication channel to be used in wireless communication, the image forming apparatus transmits a second trigger frame, which is compliant with the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard and includes information indicating that carrier sense is to be executed, to a slave station apparatus connected to the master station.