CCSDS 734.2-R-1, CCSDS Bundle Protocol Specification (Red ...

DRAFT CCSDS RECOMMENDED STANDARD FOR CCSDS BUNDLE PROTOCOL SPECIFICATION2 OVERVIEW2.1 GENERALDelay Tolerant Networking is an end-to-end network service providing communications inand/or through environments characterized by one or more of the following:– intermittent connectivity;– variable delays which may be large and irregular;– high bit error rates;– asymmetric and simplex links.To provide the end-to-end network services the DTN protocols, also known as bundleprotocols, sit above the link or transport layers of the constituent internets, forming a storeand-forwardoverlay network. Key capabilities of the bundling protocols include:– ability to cope with intermittent connectivity;– ability to take advantage of scheduled and opportunistic connectivity (in addition to‘always up’ connectivity);– custody transfer;– hop-by-hop security (authentication of transmitting entity);– end-to-end security (confidentiality, integrity) for data;– late binding of names to addresses.Reference [F1] contains descriptions of these capabilities and rationale for the DTNarchitecture.Bundle Bundle BundleTransport A Transport A Trans A Trans B Transport BNetwork A Network A Net A Net B Net BLink A1 Link A1 Link A2Link An Link B1 Link B1Phy A1 Phy A1 Phy A2Phy An Phy B1 Phy B1An internet An internetFigure 2-1: The Bundling Protocols Sit at or above the Link LayerCCSDS 734.2-R-1 Page 2-1 February 2012