Wi-Fi Direct Sink Input Relay for AV Playback Control
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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 for processing, such as coordinates, zooming, scrolling, and ASCII codes, within a Real-Time Service Protocol (RTSP) message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If users input commands to the source device to control AV data, then the source device can process control commands, but the user experience is inconvenient because the sink device cannot receive user inputs directly
Solution Approach 1:
The patent introduces a message generation unit in the sink device that acts as an intermediary. This unit captures user inputs locally and generates control messages that are transmitted to the source device, thereby mediating between the user input at the sink and the control processing at the source without requiring direct user interaction with the source device
Solution Approach 2:
The control system is segmented into distinct functional units: a user input reception unit in the sink device for capturing inputs, a message generation unit for creating control messages, and a control execution unit in the source device for processing commands. This segmentation allows each component to specialize in its function while maintaining overall system efficiency
2Ease of operation
If the sink device receives and transmits user inputs to the source device, then user input convenience is improved, but the communication protocol complexity increases
Solution Approach 1:
The message generation unit in the sink device is designed with multi-functionality, capable of generating various types of control messages (play, pause, stop, seek) based on different user inputs. This universal message generation approach simplifies the overall system by using a single mechanism for diverse control operations rather than requiring separate protocols for each control type
Solution Approach 2:
The patent utilizes parameter changes in the RTSP protocol to convey control information. By modifying existing RTSP message parameters rather than introducing entirely new protocols, the system achieves enhanced functionality while maintaining compatibility with existing Wi-Fi direct communication frameworks, thereby limiting protocol complexity growth
3Ease of operation
If the sink device generates control messages based on user input, then direct control at the sink device is enabled, but the message processing overhead increases
Solution Approach 1:
The sink device performs preliminary action by pre-generating control messages locally based on user inputs before transmitting them to the source device. This preliminary message preparation at the sink device reduces the processing burden on the source device and minimizes communication round-trip time, thereby reducing overall message processing time
Solution Approach 2:
The message generation unit creates simplified control messages that are copies or representations of user inputs in a format suitable for transmission. Rather than transmitting raw input data or complex control sequences, the system uses standardized message copies that can be quickly processed by the source device, reducing processing overhead
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.