Wireless Screen Mirroring Across Protocols With Lower Delay
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Solution Overview
Problem
Existing wireless screen casting protocols suffer from device name duplication and high end-to-end delays, complicating user selection and degrading user experience due to independent discovery procedures and varying protocols like Miracast and DLNA.
Innovation Solution
A method and apparatus that unify device names across multiple protocols by identifying and ranking screen casting protocols based on delay and success rates, and adjust encapsulation processes to reduce end-to-end delay, particularly for DLNA, by suspending, sampling, or adjusting timestamps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple independent screen casting protocols are used for device discovery, then protocol compatibility is improved, but device name duplication occurs causing increased selection complexity
Solution Approach 1:
The patent merges device names from multiple protocols by extracting protocol-agnostic identifiers (device identifier, IP address, MAC address) and matching devices across protocols. This combines the adaptability of multiple protocols while eliminating the complexity of duplicate device names in the unified device name list.
2Adaptability or versatility
If DLNA protocol is used for screen casting, then device compatibility is improved, but end-to-end delay increases affecting user experience
Solution Approach 1:
The patent performs preliminary actions by suspending encapsulation before data transmission and adjusting timestamps in advance. This prepares the data stream to compensate for the inherent delay in DLNA protocol, reducing the perceived end-to-end delay while maintaining compatibility.
Solution Approach 2:
The patent changes temporal parameters by adjusting timestamps of video frames and controlling encapsulation timing. This modifies the data transmission parameters to optimize the balance between DLNA protocol compatibility and end-to-end delay reduction.
Data Source
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AI summary
This application discloses a wireless screen casting method and apparatus. The method includes: A terminal device obtains M device names, where the M device names are obtained by separately searching for E display devices according to N screen casting protocols, and M is greater than E (S310); generates a device name list based on the M device names, where the device name list includes E device names in the M device names, and the E device names respectively correspond to the E display devices (S320); receives an indication message entered by a user, where the indication message points to a first device name in the E device names, and the first device name corresponds to a first display device in the E display devices (S330); and the terminal device performs screen casting onto the first display device (S340). According to this application, complexity of selecting a display device by the user can be reduced, and an end-to-end delay can be shortened, thereby improving user experience.