Wi-Fi Direct Sink Control for AV Playback User Input
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Solution Overview
Problem
In Wi-Fi direct communication schemes, users must input commands to the source device to control audio/video data, as sink devices cannot receive user inputs, leading to inconvenience.
Innovation Solution
Implementing a method where the sink device receives user inputs for controlling audio/video data and transmits these inputs to the source device through a Wi-Fi direct link, using a message generation and transmission mechanism that includes parameter information in RTSP messages, enabling direct user control of AV data at the sink device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sink device only displays AV data without receiving user input, then the source device maintains full control capability, but the user experience deteriorates because users must input commands to the source device instead of the sink device
Solution Approach 1:
The patent introduces a user input back channel as an intermediary communication path that allows the sink device to receive user inputs locally and forward them to the source device. This mediator channel enables the sink device to appear as the control point to users while maintaining the source device's control authority, thus improving ease of operation without fundamentally altering the control architecture.
Solution Approach 2:
The patent segments the control function into two parts: the sink device handles user input reception and local processing, while the source device maintains ultimate control authority. This segmentation allows the user interface to be separated from the control logic, enabling users to interact with the sink device conveniently while the source device processes and executes control commands.
2Ease of operation
If the sink device receives and processes user inputs locally, then user experience improves through direct control at the display device, but the device complexity increases due to additional message generation and transmission mechanisms
Solution Approach 1:
The patent makes the sink device multi-functional by enabling it to not only display AV data but also receive user inputs and generate control messages. The sink device is designed to handle multiple roles (display terminal and input reception point) through a unified architecture that uses standard Wi-Fi direct communication protocols, thus improving local control capability without requiring completely separate systems.
Solution Approach 2:
The patent implements a feedback mechanism where the sink device receives user inputs, generates appropriate control messages, transmits them to the source device, and receives acknowledgments or status updates. This feedback loop enables the sink device to function as an intelligent control node with local processing capabilities while maintaining system-wide coordination through standardized message exchanges.
3Ease of operation
If a user input back channel is established from sink to source device, then user input transmission is enabled, but the communication protocol complexity increases
Solution Approach 1:
The patent merges the user input back channel with the existing Wi-Fi direct communication infrastructure. Instead of creating a separate dedicated protocol, the solution combines input transmission capabilities with the existing AV data communication framework, using the same Wi-Fi direct link for both data and control purposes. This merging approach enables input transmission without requiring completely separate communication protocols.
Solution Approach 2:
The patent uses message copying mechanisms where control messages are generated at the sink device based on user inputs and then transmitted to the source device using formatted protocols similar to existing RTSP (Real Time Streaming Protocol) structures. This copying approach allows the system to leverage existing protocol frameworks while adding new input transmission functionality, thus reducing the need to create entirely new complex protocols.
Data Source
AI summary
A method of performing communication between a sink device and a source device in a Wi-Fi direct network is provided. The method includes receiving a user's input, on a sink device, for controlling audio/video (AV) data received from the source device, generating a message for controlling the AV data based on the user's input, and transmitting the message to the source device through a Wi-Fi direct link.