Internet Engineering Task Force N. Kuhn, Ed. Internet-Draft CNES Intended status: Informational E. Lochin, Ed. Expires: December 31, 2017 ISAE June 29, 2017 Network coding and satellites draft-kuhn-nwcrg-network-coding-satellites-00 Abstract This memo presents the current deployment of network coding in some satellite telecommunications systems along with a discussion on the multiple opportunities to introduce these technics at a wider scale. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on December 31, 2017. Copyright Notice Copyright (c) 2017 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Kuhn & Lochin Expires December 31, 2017 [Page 1] Internet-Draft Network coding and satellites June 2017 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Glossary . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2. Requirements Language . . . . . . . . . . . . . . . . . . 3 2. A note on satellite topology . . . . . . . . . . . . . . . . 3 2.1. Generic description of multi-gateway satellite networks . 3 2.2. Focus on satellite gateway description . . . . . . . . . 3 3. Status of network coding in actually deployed satellite systems . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4. Opportunities for more network coding in satellite systems . 4 5. Deployability and related use cases . . . . . . . . . . . . . 4 5.1. Network coding and VNF . . . . . . . . . . . . . . . . . 4 5.2. Network coding and PEP . . . . . . . . . . . . . . . . . 4 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4 7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 4 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4 9. Security Considerations . . . . . . . . . . . . . . . . . . . 4 10. References . . . . . . . . . . . . . . . . . . . . . . . . . 4 10.1. Normative References . . . . . . . . . . . . . . . . . . 4 10.2. Informative References . . . . . . . . . . . . . . . . . 5 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5 1. Introduction Network coding schemes are inherent part of the satellite systems, since the challenging physical layer require specific robustness to guarantee an efficient usage of the expensive radio resource. Further exploiting these schemes is an opportunity for a better end user experience along with a better exploitation of the scarce resource. In this context, this memo aims at: o summing up the current deployment of network coding schemes; o identifying opportunities for further usage of network coding in satellite systems. 1.1. Glossary The glossary of this memo is related to the network coding taxonomy document [I-D.irtf-nwcrg-network-coding-taxonomy]. The glossary is extended as follows: o XX: XX Kuhn & Lochin Expires December 31, 2017 [Page 2] Internet-Draft Network coding and satellites June 2017 1.2. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. 2. A note on satellite topology The objective of this section of to provide a generic description of the components composing a generic satellite system and their interaction. 2.1. Generic description of multi-gateway satellite networks This subsection presents a high level description of a multi-gateway satellite network. 2.2. Focus on satellite gateway description This subsection focuses on the description of the functions that take place in a generic satellite gateway. 3. Status of network coding in actually deployed satellite systems Figure 1 presents the status of the network coding deployment in satellite systems. The information is based on the taxonomy document [I-D.irtf-nwcrg-network-coding-taxonomy] and the notations are the following: End-to-End Coding (E2E), Network Coding (NC), Intra-Flow Coding (IntraF), Inter-Flow Coding (InterF), Single-Path Coding (SP) and Multi-Path Coding (MP). +------+-------+---------+---------------+-------+ + | Upper | Middle | Communication layers | + | Appl. | ware | | + +-------+---------+---------------+-------+ | |Source | Network | Packetization | PHY | | |coding | AL-FEC | UDP/IP | layer | +------+-------+---------+---------------+-------+ |E2E | x | | | | |NC | | | | x | |IntraF| | | | | |InterF| | | | | |SP | | | | | |MP | | | | | +------+-------+---------+---------------+-------+ Figure 1: Network coding and satellite systems Kuhn & Lochin Expires December 31, 2017 [Page 3] Internet-Draft Network coding and satellites June 2017 4. Opportunities for more network coding in satellite systems This section extends Section 3 by presenting the opportunities for more network coding in satellite systems. . 5. Deployability and related use cases This section details use-cases where the usage of network coding schemes could improve the overall system and the deployability of the opportunities that are provided in Section 4. 5.1. Network coding and VNF Related to the foreseen virtualized network infrastructure, the network coding schemes could be proposed as VNF and their deployability enhanced. 5.2. Network coding and PEP Related to the impact and integration of network coding in Proxy- Enhanced-Proxy RFC 3135 [RFC3135] architecture. In particular how network coding can be integrated inside a PEP with QoS scheduler as defined, for instance, in RFC 5865 [RFC5865]. 6. Acknowledgements 7. Contributors Many thanks to 8. IANA Considerations This memo includes no request to IANA. 9. Security Considerations This document, by itself, presents no new privacy nor security issues. 10. References 10.1. Normative References Kuhn & Lochin Expires December 31, 2017 [Page 4] Internet-Draft Network coding and satellites June 2017 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC3135] Border, J., Kojo, M., Griner, J., Montenegro, G., and Z. Shelby, "Performance Enhancing Proxies Intended to Mitigate Link-Related Degradations", RFC 3135, DOI 10.17487/RFC3135, June 2001, . [RFC5865] Baker, F., Polk, J., and M. Dolly, "A Differentiated Services Code Point (DSCP) for Capacity-Admitted Traffic", RFC 5865, DOI 10.17487/RFC5865, May 2010, . 10.2. Informative References [I-D.irtf-nwcrg-network-coding-taxonomy] Adamson, B., Adjih, C., Bilbao, J., Firoiu, V., Fitzek, F., samah.ghanem@gmail.com, s., Lochin, E., Masucci, A., Montpetit, M., Pedersen, M., Peralta, G., Roca, V., Saxena, P., and S. Sivakumar, "Network Coding Taxonomy", draft-irtf-nwcrg-network-coding-taxonomy-03 (work in progress), June 2017. Authors' Addresses Nicolas Kuhn (editor) CNES 18 Avenue Edouard Belin Toulouse 31400 France Phone: 0033561273213 Email: nicolas.kuhn@cnes.fr Emmanuel Lochin (editor) ISAE 10 Avenue Edouard Belin Toulouse 31400 France Email: emmanuel.lochin@isae.fr Kuhn & Lochin Expires December 31, 2017 [Page 5]