Video Reception Device Splitting Streams for Limited Bandwidth
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Solution Overview
Problem
Existing digital television broadcast technologies face challenges in providing high-definition (HD) television services over networks with limited bandwidth, as clients with insufficient access bandwidth cannot receive HD content in real time, and existing solutions do not effectively address eligibility for HD services on wideband networks or broadcast networks.
Innovation Solution
A method that splits video content into a base layer stream and enhancement layers, where the enhancement layers are pre-downloaded and synchronized with the real-time base layer stream, allowing clients to receive HD content even with limited bandwidth, and optimizing the number of channels broadcast simultaneously by using hybrid networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If video content is transmitted in real-time over networks with limited bandwidth, then clients can receive content without delay, but clients with insufficient bandwidth cannot receive HD content
Solution Approach 1:
The video stream is segmented into base layer and enhancement layers. The base layer is transmitted in real-time over the network, while enhancement layers are pre-downloaded during off-peak periods. This segmentation allows clients with limited bandwidth to receive the essential base layer in real-time while optionally accessing pre-downloaded enhancement layers for improved quality.
Solution Approach 2:
Enhancement layers are pre-downloaded and stored in the client's storage device before the actual viewing time. This preliminary action allows the enhancement data to be readily available when needed, without requiring high real-time bandwidth. The system performs the data transfer in advance when network conditions are more favorable.
2Reliability
If enhancement layers are pre-downloaded to enable HD content reception, then clients with limited bandwidth can access HD content, but additional storage and data management complexity is required
Solution Approach 1:
The reception device is designed to handle multiple functions: receiving and decoding base layer streams in real-time, storing pre-downloaded enhancement layers, and synchronizing these layers during playback. This multi-functional design consolidates what could be separate systems into a single integrated device, managing complexity through unified architecture.
Solution Approach 2:
The reception device acts as an intermediary between the network transmission and the final playback. It manages the synchronization and combination of base layer and enhancement layer data, mediating between the asynchronous arrival of these data streams and the requirement for synchronized HD output.
3Speed
If base layer and enhancement layers are transmitted simultaneously, then real-time HD reception is possible, but bandwidth requirements increase significantly
Solution Approach 1:
Instead of transmitting all enhancement layer data simultaneously with the base layer, the system performs preliminary downloading of enhancement layers during off-peak periods. This shifts the bandwidth consumption from real-time to non-real-time periods, reducing the instantaneous bandwidth requirements while still enabling HD reception when needed.
Solution Approach 2:
The system uses periodic action by downloading enhancement layers in advance during periods when real-time transmission is not required. The base layer is transmitted continuously in real-time, while enhancement layers are periodically updated or downloaded when network conditions permit, creating a rhythm of real-time and non-real-time data transfer.
Data Source
AI summary
The invention relates to a method for reception of video contents and services streamed or broadcast by a television operator towards a multitude of reception devices, the encoded video contents and services being split into a first data stream and a second data stream, comprising a step for receiving the first data stream streamed or broadcast in a first transport session, a step for receiving the second data stream transmitted in a second transport session, the second data stream being transmitted prior to the first data stream and the second data stream not being able to be decoded without the first data stream, a step for recording the second data stream in a storage means of the device, a step for continuously synchronizing the second data stream with the first data stream into a stream being sent to the decoding means.