1、- 1 - Place des Nations Telephone +41 22 730 51 11 Telex 421 000 uit ch E-mail: itumailitu.int CH-1211 Geneva 20 Telefax Gr3: +41 22 733 72 56 Telegram ITU GENEVE www.itu.int Switzerland Gr4: +41 22 730 65 00 QUESTION ITU-R 263-1/4 Performance objectives of digital links in the fixed-satellite servi
2、ce for transmission of Internet or higher layer Protocol packets (1999-2006) The ITU Radiocommunication Assembly, considering a) that fixed-satellite systems are part of the new global information infrastructure (GII); b) that availability and performance criteria for transmission of Internet Protoc
3、ol (IP) packets may have an impact on satellite link design; c) that new requirements for IP or higher layer protocols and applications are constantly appearing which may have an impact on satellite link design; d) that transmission of IP packets on satellite links may require performance objectives
4、 different from those contained in ITU-T Recommendation G.826 and Recommendations ITU-R S.1062 and ITU-R S.1420; e) that the required system capacity and access schemes must be considered in the design and planning of IP-based networks in the FSS, decides that the following Question should be studie
5、d 1 What are the reference satellite network architectures required to support IP? 2 What is the performance required of satellite links to support network layer protocols, the Internet specific protocols and transport layer protocols running over IP? 3 What is the performance required of satellite
6、links to support, for example voice, video, videotelephony and file transfer running over IP? 4 What are the needs for potential improvements to IP or higher layer protocols within the IP layer model that enhance their performance over satellite links? 5 What impact do IP privacy and security protoc
7、ols and related issues have on satellite link requirements? 6 What arrangements should be made by the ITU-R to offer the most appropriate liaison with the ITU-T and other standards bodies (for example the IETF)? - 2 - C:DOCUMENTS AND SETTINGSQGV33745MY DOCUMENTSDOWNLOADSR-QUE-SG04.263-1-2006-MSW-E.DOC 7 What are the required system capacity and access schemes that must be considered in the design and planning of IP-based networks in the FSS? further decides 1 that the above studies should be completed by 2008. Category: S1
