Offline WFD Source Session Management via Intermediary Routing
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Solution Overview
Problem
Existing Wi-Fi Display (WFD) systems do not allow non-capable devices to participate as a source in an existing WFD session without terminating the current session and requiring Media Access Layer (MAC) and physical layer (PHY) changes, making the process time-consuming and inefficient.
Innovation Solution
A system enables non-Wi-Fi Display (Non-WFD) devices to participate as offline sources in WFD sessions without disrupting existing sessions, by requesting and receiving acknowledgment from the WFD source, and establishing the session using integrated circuits with processors and memory configured to operate with computer program code, allowing multimedia content streaming and control packet routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-WFD devices are allowed to participate as sources in existing WFD sessions, then device compatibility and network flexibility are improved, but session management complexity and protocol modification requirements increase
Solution Approach 1:
The patent introduces a session manager component that acts as an intermediary between non-WFD devices and the WFD session infrastructure. This session manager handles protocol conversions, packet formatting, and coordination with existing WFD sources and sinks, allowing non-WFD devices to participate without directly modifying the core WFD protocol stack or requiring MAC/PHY layer changes.
2Ease of operation
If non-WFD devices can join existing sessions without MAC and PHY changes, then ease of operation is improved, but the ability to handle control packets and maintain session integrity may be compromised
Solution Approach 1:
The patent implements a mechanism where control packets intended for non-WFD devices are copied and routed through the existing WFD source device. The WFD source receives control packets from sinks, replicates them with appropriate addressing for the non-WFD device, and forwards them through the Wi-Fi network. This copying approach allows non-WFD devices to receive and process control packets without requiring them to implement the full WFD control packet handling stack, maintaining session integrity while simplifying device requirements.
3Adaptability or versatility
If multiple sources are allowed in a WFD session, then content sharing flexibility is improved, but conflicts with the single-source WFD specification and session stability increase
Solution Approach 1:
The patent segments the source functionality into two distinct roles: the primary WFD source that maintains the official WFD session and adheres to the single-source specification, and secondary offline sources that can share content without full WFD source privileges. The primary source handles control packet routing and session management, while offline sources contribute multimedia content through simplified protocols. This segmentation allows multiple content sources coexisting in the session without violating the WFD specification's single-source requirement, maintaining session stability while enabling flexible content sharing.
Data Source
AI summary
A system that enhances Wi-Fi display and enables a non WFD device to establish a session with a WFD source in an existing WFD session and to function as an offline WFD source without terminating an existing WFD session. The system enables an offline WFD source to stream multimedia content and control packets to sinks via the WFD source and control packets from the sinks to the offline WFD source. The system eliminates a need to reestablish a new session and improves workflow and a user experience.