Streaming Device Latency Reduction via Pre-Established Security Keys
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Solution Overview
Problem
Current streaming technologies experience significant latency when delivering over-the-air HDTV content to client devices, particularly due to the time required for encryption handshakes and data encryption, which delays the display of video streams.
Innovation Solution
A streaming device transmits a reduced resolution version of the audiovisual content initially, establishes security parameters, and then sends an encrypted version after a predetermined time, minimizing latency by bypassing the encryption handshake process and adjusting the time delay based on the number of concurrent streams and estimated data transfer time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption handshake and data encryption are performed before transmitting audiovisual content, then security is ensured, but streaming start latency increases
Solution Approach 1:
The patent performs encryption handshake and establishes security parameters in advance before the client device requests audiovisual content. By pre-configuring encryption keys and security protocols, the system eliminates the time penalty that would otherwise be incurred during the streaming initiation phase, thus reducing streaming start latency while maintaining security.
Solution Approach 2:
The patent segments the streaming process into distinct phases: a preliminary security setup phase where encryption parameters are established, and a content delivery phase where pre-configured security is applied. This segmentation allows security operations to be decoupled from the critical content delivery path, reducing their impact on streaming start latency.
2Loss of time
If reduced resolution version is transmitted first, then streaming start latency is reduced, but content quality deteriorates
Solution Approach 1:
The patent segments the video content into two quality levels: a reduced resolution version for immediate playback and a full resolution version for later delivery. This allows the system to provide quick access to content while maintaining the option to deliver high-quality versions, effectively resolving the contradiction between fast startup and quality preservation.
Solution Approach 2:
The patent transmits a partial version (reduced resolution) of the audiovisual content first to enable immediate playback, reducing streaming start latency. The full-quality content is then transmitted subsequently, ensuring that complete quality is eventually delivered without blocking the initial playback experience.
Data Source
AI summary
Methods and apparatuses for improving the delivery of streamed audiovisual content derived from over-the-air digital television signals by reducing streaming start latency are described. In response to detecting a request from a client device to begin a streaming session for a video stream captured by an over-the-air antenna, a streaming device in communication with the client device via a wired or wireless networking connection may transmit a reduced resolution version of the video stream to the client device, establish encryption and decryption keys for a secure connection with the client device while the reduced resolution version of the video stream is transmitted to the client device, communicate a point in time after which an encrypted version of the video stream will be transmitted to the client device, and transmit the encrypted version of the video stream to the client device starting at the point in time.