Satellite CDN Edge Caching Reduces Uplink Traffic
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Solution Overview
Problem
Conventional satellite networks face limitations in bandwidth, particularly on the uplink, due to asymmetric internet traffic patterns and the lack of bandwidth sharing opportunities, which hampers the delivery of high-bandwidth content like video streaming and delays sensitive applications like voice calls.
Innovation Solution
A satellite-based content delivery network (CDN) architecture utilizing a multi-layered structure with LEO satellites, high-altitude airships, GEO/MEO satellites, and lunar data centers for edge caching and storage, employing advanced technologies like load balancing, edge computing, and high-bandwidth optical inter-satellite links to reduce uplink traffic and enhance data throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional satellite networks are used, then basic communication is maintained, but bandwidth is limited particularly on uplink and cannot support high-bandwidth content delivery
Solution Approach 1:
The patent implements edge caching at LEO satellites and high-altitude airships, pre-storing popular content closer to users before demand arises. This preliminary action reduces the need for high uplink bandwidth when content is requested, as cached content can be delivered directly via downlink.
Solution Approach 2:
The patent introduces high-altitude airships as intermediary nodes between ground users and LEO satellites. These airships equipped with storage devices act as additional caching layers, mediating content delivery and reducing uplink traffic by serving content from their local storage.
2Adaptability or versatility
If asymmetric internet traffic patterns are accommodated, then basic network operation is maintained, but uplink bandwidth sharing opportunities are lost
Solution Approach 1:
Content is cached in advance at edge locations (LEO satellites and high-altitude airships) based on predicted demand patterns. This preliminary caching action enables bandwidth sharing by allowing multiple users to access the same cached content without requiring separate uplink transmissions for each user.
3Productivity
If multi-layered CDN architecture is implemented, then uplink traffic is reduced and data throughput improves, but system complexity increases
Solution Approach 1:
The patent segments the CDN architecture into distinct layers: ground-based CDNs, LEO satellite caching layer, and high-altitude airship caching layer. Each layer operates semi-independently with defined interfaces, managing complexity through modular segmentation while achieving improved data throughput.
Solution Approach 2:
The patent adds a spatial dimension to the CDN architecture by deploying caching nodes in three-dimensional space (ground, LEO orbit, and high-altitude atmosphere). This dimensional expansion distributes content delivery across multiple altitudes and locations, improving throughput while managing complexity through spatial distribution.
Data Source
AI summary
Technology for satellite-based content delivery network (CDN) is described. The satellite-based CDN uses a network architecture to provide global high-speed Internet service from above the sky through various aircrafts such as high-altitude airships, satellites, space stations, and eventually the lunar data centers by taking into consideration of the technology advancements in the RF and optical wireless communications. The satellite-based CDN provides content delivery over data networks, aviation, data storage, and edge caching. The satellite-based CDN supports both the delay-sensitive traffic such as interactive services, voice calls, and video calls that consume medium to low data bandwidth, and the more delay-tolerant but high bandwidth Internet content items such as streaming and background services (e.g. email, FTP). The satellite-based CDN can also support highly time sensitive applications that require near real-time responses such as professional gaming in selected areas covered by the high-altitude airships.