Satellite Cache System for Video Data Transmission
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Solution Overview
Problem
Multi-spot satellite telecommunication systems face challenges in efficiently transmitting video data due to resource wastage and latency, particularly in on-demand services like VoD, where existing solutions either incur high costs or complicate satellite payload with regeneration requirements.
Innovation Solution
Implementing a cache system at the satellite level with transparent processing for the return channel and using proxies at ground gateways to manage content storage and distribution, allowing for efficient data caching and reduced latency without increasing satellite mass or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cache is implemented in user ground segment terminals, then quality of service and transport efficiency are greatly improved, but significant additional cost and maintenance problems are introduced
Solution Approach 1:
The patent introduces a proxy server as an intermediary component between users and the satellite system. This proxy server handles caching operations on the ground segment, eliminating the need for cache implementation in expensive satellite terminals while still providing quality of service improvements through content caching and local retrieval capabilities
Solution Approach 2:
The patent implements content copying mechanisms where popular video content is cached in proxies on the ground segment and in the satellite's transparent buffer. This allows multiple users to access copied versions of content locally rather than requiring continuous satellite transmission, improving service quality while keeping satellite hardware simple
2Loss of energy
If cache is implemented at satellite level with on-board processing, then resource waste is reduced, but satellite payload complexity and mass increase
Solution Approach 1:
The patent uses ground-based proxy servers as intermediaries to handle complex caching and content management operations. The satellite itself remains a simple transparent buffer, eliminating the need for complex on-board processing while still achieving resource efficiency through coordinated ground-satellite-terrestrial caching
Solution Approach 2:
The patent segments the caching function across multiple levels: ground proxies handle popular content caching, the satellite provides transparent buffering for broadcast content, and terrestrial networks handle final delivery. This segmentation allows resource waste reduction without concentrating all complexity in the satellite payload
3Adaptability or versatility
If satellite processes return channel digitally, then cache management and on-demand access are enabled, but regeneration of return path complicates satellite payload
Solution Approach 1:
The patent inverts the traditional approach by making the forward channel (gateway to user) the processed path with cache management, while keeping the return channel simple and transparent. This allows on-demand content delivery capabilities without complicating the return path, as content is pre-positioned in proxies and satellite buffer before user requests arrive
4Device complexity
If video content is broadcast to all users simultaneously, then simple broadcast architecture is used, but resource waste occurs for users who do not need the content
Solution Approach 1:
The patent implements preliminary action by pre-caching popular video content in ground proxies and pre-positioning content in the satellite's transparent buffer before user requests arrive. This allows the system to switch from wasteful broadcast-to-all architecture to efficient on-demand delivery, reducing bandwidth waste while maintaining architectural simplicity
Solution Approach 2:
The patent applies local quality by implementing caching selectively at ground proxies based on local user demand patterns. Each proxy caches content relevant to its local user base, reducing overall bandwidth waste while maintaining simple broadcast architecture for content distribution to proxies
Data Source
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AI summary
The invention relates to a method and a system for transmitting data in a satellite system comprising at least one satellite (1), a gateway (2) and a user terminal (3) comprising at least the following steps: • Transmitting (203) a request Rq of data content issued by a user (204) to the gateway, • Upon receiving the content of the request Rq, the gateway (2) issues an order to the satellite (1) so that the latter transmits the content requested by the user to the user, • The user (3) acknowledges receipt (206) of all or at least part of this content to the gateway.