Requirements for a Location-by-Reference Mechanism
RFC 5808

Internet Engineering Task Force (IETF)                  R. Marshall, Ed.
Request for Comments: 5808                                           TCS
Category: Informational                                         May 2010
ISSN: 2070-1721

           Requirements for a Location-by-Reference Mechanism

Abstract

   This document defines terminology and provides requirements relating
   to the Location-by-Reference approach using a location Uniform
   Resource Identifier (URI) to handle location information within
   signaling and other Internet messaging.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5808.

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Marshall                      Informational                     [Page 1]
RFC 5808                GEOPRIV LbyR Requirements               May 2010

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Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................5
   3. Overview of Location-by-Reference ...............................6
      3.1. Location URI Usage .........................................7
      3.2. Location URI Expiration ....................................8
      3.3. Location URI Authorization .................................8
      3.4. Location URI Construction ..................................9
   4. High-Level Requirements .........................................9
      4.1. Requirements for a Location Configuration Protocol .........9
      4.2. Requirements for a Location Dereference Protocol ..........11
   5. Security Considerations ........................................12
   6. Acknowledgements ...............................................13
   7. References .....................................................13
      7.1. Normative References ......................................13
      7.2. Informative References ....................................13

Marshall                      Informational                     [Page 2]
RFC 5808                GEOPRIV LbyR Requirements               May 2010

1.  Introduction

   All location-based services rely on ready access to location
   information.  Location information can be used in either a direct,
   Location-by-Value (LbyV) approach or an indirect, Location-by-
   Reference (LbyR) approach.

   For LbyV, location information is conveyed directly in the form of a
   Presence Information Data Format Location Object (PIDF-LO) [RFC4119].
   Using LbyV might be either infeasible or undesirable in some
   circumstances.  There are cases where LbyR is better able to address
   location requirements for a specific architecture or application.
   This document provides a list of requirements for use with the LbyR
   approach, and leaves the LbyV model explicitly out of scope.