A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Licklider Transmission Protocol - Specification
Author(s) : M. Ramadas, et al.
Filename : draft-irtf-dtnrg-ltp-08.txt
Pages : 55
Date : 2008-01-18
This document describes the Licklider Transmission Protocol (LTP),
designed to provide retransmission-based reliability over links
characterized by extremely long message round-trip times (RTTs)
and/or frequent interruptions in connectivity. Since communication
across interplanetary space is the most prominent example of this
sort of environment, LTP is principally aimed at supporting "long-
haul" reliable transmission in interplanetary space, but it has
applications in other environments as well.
LTP does ARQ of data transmissions by soliciting selective-
acknowledgment reception reports. It is stateful, and has no
negotiation or handshakes.
In an Interplanetary Internet setting deploying the Bundle protocol
that is being developed by the Delay Tolerant Networking Research
Group, LTP is intended to serve as a reliable "convergence layer"
protocol operating in pairwise fashion between adjacent
Interplanetary Internet nodes that are in direct RF communication.
In that operational scenario, and potentially in some other
deployments of the Bundle Protocol, LTP runs directly over a data-
link layer protocol; when this is the case, forward error correction
coding and/or checksum mechanisms in the underlying data-link layer
protocol must assure the integrity of the data passed between the
communicating entities.
LTP MUST only be used over UDP for software development or in private
local area networks.
Since no mechanisms for flow control or congestion control are
included in the design of LTP, this protocol is not intended or
appropriate for ubiquitous deployment in the global Internet.
This document is a product of the Delay Tolerant Networking Research
Group and has been reviewed by that group. No objections to its
publication as an RFC were raised.
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