Probabilistic Routing Protocol for Intermittently Connected Networks
draft-irtf-dtnrg-prophet-09

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DTN Research Group                                           A. Lindgren
Internet-Draft                                                      SICS
Intended status: Experimental                                   A. Doria
Expires: October 5, 2011                                      Consultant
                                                               E. Davies
                                                        Folly Consulting
                                                               S. Grasic
                                          Lulea University of Technology
                                                           April 3, 2011

  Probabilistic Routing Protocol for Intermittently Connected Networks
                      draft-irtf-dtnrg-prophet-09

Abstract

   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.

   This document defines PRoPHET, a Probabilistic Routing Protocol using
   History of Encounters and Transitivity.  PRoPHET is a variant of the
   epidemic routing protocol for intermittently connected networks that
   operates by pruning the epidemic distribution tree to minimize
   resource usage while still attempting to achieve the best case
   routing capabilities of epidemic routing.  It is intended for use in
   sparse mesh networks where there is no guarantee that a fully
   connected path between source and destination exists at any time,
   rendering traditional routing protocols unable to deliver messages
   between hosts.  These networks are examples of networks where there
   is a disparity between the latency requirements of applications and
   the capabilities of the underlying network (networks often referred
   to as Delay- and Disruption-Tolerant).  The document presents an
   architectural overview followed by the protocol specification.

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
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   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

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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on October 5, 2011.

Copyright Notice

   Copyright (c) 2011 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.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   5
     1.1.  Relation to the Delay Tolerant Networking architecture  .   7
     1.2.  Applicability of the protocol . . . . . . . . . . . . . .   8
     1.3.  PRoPHET as Compared to Regular Routing Protocols  . . . .  10
     1.4.  Requirements notation . . . . . . . . . . . . . . . . . .  11
   2.  Architecture  . . . . . . . . . . . . . . . . . . . . . . . .  12
     2.1.  PRoPHET . . . . . . . . . . . . . . . . . . . . . . . . .  12
       2.1.1.  Characteristic Time Interval  . . . . . . . . . . . .  12
       2.1.2.  Delivery Predictability Calculation . . . . . . . . .  13
       2.1.3.  Optional Delivery Predictability Optimizations  . . .  17
       2.1.4.  Forwarding Strategies and Queueing Policies . . . . .  18
     2.2.  Bundle Agent to Routing Agent Interface . . . . . . . . .  19
     2.3.  PRoPHET Zone Gateways . . . . . . . . . . . . . . . . . .  20
     2.4.  Lower Layer Requirements and Interface  . . . . . . . . .  21
   3.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .  23
     3.1.  Neighbor Awareness  . . . . . . . . . . . . . . . . . . .  23
     3.2.  Information Exchange Phase  . . . . . . . . . . . . . . .  23
       3.2.1.  Routing Information Base Dictionary . . . . . . . . .  26