Internet Access via Satellite Enhancing the Satellite Performance. The Art of Content Distribution. or Bringing the Satellite close to Earth
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1 DLR Workshop Digital Divide and Satellite: Chances, Difficulties and Actions 11 th February, 2004 Bonn-Oberkassel Tellitec Engineering GmbH Internet Access via Satellite Enhancing the Satellite Performance or Bringing the Satellite close to Earth The Art of Content Distribution Slides presented by: Nils Seifert Tel Tellitec Slide No. 1
2 Research and Development Tellitec Engineering GmbH Third Party Product Development Tellitec Communications bvba Software Solutions for the Satellite Communication Industry (integrated in many Hardware Platforms of multiple vendors) TelliNet Fast Internet via Satellite TelliCast Multicast Content Distribution TelliVision Multicast Video On Demand Tellitec Slide No. 2
3 Satellite Comm. Infrastructure Satellite Communication Infrastructure helping to bridge the Digital Gap A: (DVB/RCS, vsat) B: low cost, narrow backch. (satmode, itv) C: terrestrial D: without 2-way bidirectional Satellite Services allow high bandwidth / capacity in forward as well as DVB/RCS / VSAT /... Higher costs -> well suited for commercial users 2-way mass market Satellite Services allow high bandwidth / capacity in forward, but very narrow ESA satmode, ESA itv Low Costs -> interesting for private users as well ellite Services with terrestrial requires two communication links allows high bandwidth / capacity in forward, but narrow ellite Services without Return Channel requires two communication links allows pushing only -> no equivalent Internet Usage (no free content choice ) Tellitec Slide No. 3
4 End-User Satisfaction Applications Crucial how Software Solution? can help A: (DVB/RCS, vsat) B: low cost, narrow backch. (satmode, itv) C: terrestrial D: without Broadband Data Reception Full Internet Usage (Free Choice) pre-selection only Full Video On Demand subscription only Costs Capacity, Bandwidth Performance (RTT) TCP-Enhancement HTTP-Prefetching Application spec. Enhancem. Compression Protocol Conversion Multicast Content Distribution Encryption QoS Authentication... Tellitec Slide No. 4
5 Web-Surfing / HTTP-Prefetching Without add. Software Support HTTP Prefetching End-User experience after 3 seconds. duration: 31 sec -90,3% 3 sec terrestrial DSL: 3 sec Simulated 500ms x 2-way, 1 Mbit/s 2-way un congested, IE 6.0 HTTP 1.1, TelliNet HTTP+TCP Enh. UDP, ( as of Febr uary 9th, 2004) Tellitec Slide No. 5
6 Web-Surfing / HTTP-Prefetching HTTP, FTP HTTPS any standard Web Cache e.g. squid Web Cache storage HTTP HTTP HTTP Prefetching Solving Low HTTP Performance: (Normally many RTT-Delays before more complex web pages can be displayed at receivers.) HTTP Prefetching (server based) Distributed Proxy Performance Enhancing Proxy (PEP) TELLINET Server Daemon Corporate Network, Internet, Satellite, TV Cable, xdsl, Radio,... TELLINET Client Daemon HTTP Prefetching TCP Backchannel (firewall and NAT friendly) performant HTTP usage and web surfing HTTP any standard Web Browser e.g. IE, Netscape Tellitec Slide No. 6
7 Web-Surfing / HTTP-Prefetching Without add. Software Support HTTP Prefetching End-User experience after 11 seconds. duration: 53 sec -79% 11 sec terrestrial DSL: 5 sec IP volume: IP packets: forward IP volume: forward IP packets: return IP volume: return IP packets: 22,6 kbyte -54% 10,4 kbyte 161 pkt -43% 91 pkt 196 kbyte -21% 155 kbyte (compressed) 210 pkt -9,5% 190 pkt (compressed) 22,6 kbyte -56% 9,9 kbyte (compressed) 161 pkt -74% 42 pkt (compressed) Simulated 500ms x 2-way, 1 Mbit/s 2-way uncongested, IE 6.0 HTTP 1.1, TelliNet HTTP+TCP Enh. UDP, ( as of February 6th, 2004) Tellitec Slide No. 7
8 Downloads / TCP-Enhancement HTTP, FTP HTTPS HTTP,HTTPS,FTP,TCP any standard Web Cache e.g. squid HTTP HTTPS FTP Web Cache storage Enhanced TCP Solving TCP Drawbacks: (Drawbacks of TCP when used over high delay and lossy networks) Window Size Slowstart Algorithm Backchannel Bandwidth adds encryption and compression Distributed Proxy Performance Enhancing Proxy (PEP) TELLINET Server Daemon Corporate Network, Internet, Satellite, TV Cable, xdsl, Radio,... any standard Web Browser e.g. IE, Netscape TELLINET Client Daemon Enhanced TCP HTTP, HTTPS, SOCKS, FTPviaHTTP, Port Forwarding TCP Backchannel (firewall and NAT friendly) other Applications e.g. via SOCKS or Port Forwarding Tellitec Slide No. 8
9 Downloads / TCP-Enhancement Without add. Software Support file: Byte 4 Mbit/s Satellite Link ETCP Protocol End-User experience after 12 seconds. duration: 88 sec -86% 12 sec (peak IP+MAC rate of 3,947,586 bit/s) return IP volume: return IP packets: 120 kbyte -85% 18 kbyte 2,259 pkt -92% 189 pkt (compression was not activated) Simulated 500ms x 2-way, 4 Mbit/s 2-way uncongested, IE 6.0 HTTP 1.1, TelliNet TCP Enh. UDP Tellitec Slide No. 9
10 Satellite Comm. Infrastructure Satellite Communication Infrastructure helping to bridge the Digital Gap A: (DVB/RCS, vsat) TelliNet Fast Internet via Satellite B: low cost, narrow backch. (satmode, itv) C: terrestrial D: without Tellitec Slide No. 10
11 Satellite Comm. Infrastructure Satellite Communication Infrastructure helping to bridge the Digital Gap A: (DVB/RCS, vsat) TelliCast Multicast Content Distribution B: low cost, narrow backch. (satmode, itv) C: terrestrial D: without Tellitec Slide No. 11
12 Satellite Comm. Infrastructure Satellite Communication Infrastructure helping to bridge the Digital Gap A: (DVB/RCS, vsat) TelliVision Multicast Video On Demand B: low cost, narrow backch. (satmode, itv) C: terrestrial D: without Tellitec Slide No. 12
13 Multicast Video On Demand Conventional Video On Demand Streaming Transmitted Data: User Entry Points: Bandwidth Factor: +1 per receiver (unlimited!); here up to 8 Problem: does not scale - unlimited bandwidth required!!! Tellitec Slide No. 13
14 Multicast Video On Demand Conventional Near Video On Demand Transmitted Data: (aggregating all entry points over 2 minutes) User Entry Points: (aggregating all entry points over 2 minutes) Bandwidth Factor: +1 per entry point; here up to 6 Problem: high bandwidth demand and reduced service quality Tellitec Slide No. 14
15 Multicast Video On Demand Conventional Video Streaming Transmitted Data: User Entry Points: Bandwidth Factor: +1 per receiver (unlimited!); here up to 8 Problem: does not scale - unlimited bandwidth required!!! Tellitec Slide No. 15
16 Multicast Video On Demand Multicast Video On Demand / MediaOnDemand Transmitted Data: User Entry Points: Bandwidth Factor: here up to 4 Advantage: scales nicely upper bandwidth boundary results in bandwidth factor 8 for 2 hour video with a maximum delay of 4.5 seconds for an unlimited number of receivers Tellitec Slide No. 16
17 Satellite Comm. Infrastructure Satellite Communication Infrastructure helping to bridge the Digital Gap A: (DVB/RCS, vsat) B: low cost, narrow backch. (satmode, itv) C: terrestrial D: without Crucial Costs Capacity, Bandwidth Performance (RTT) how Software Solution? can help TCP-Enhancement HTTP-Prefetching Application spec. Enhancem. Compression Protocol Conversion Multicast Content Distribution Encryption QoS Authentication... Tellitec Slide No. 17
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