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Use of Device Identity in HTTP-Enabled Location Delivery (HELD)
RFC 6155

Internet Engineering Task Force (IETF)                   J. Winterbottom
Request for Comments: 6155                                    M. Thomson
Category: Standards Track                             Andrew Corporation
ISSN: 2070-1721                                            H. Tschofenig
                                                  Nokia Siemens Networks
                                                               R. Barnes
                                                        BBN Technologies
                                                              March 2011

    Use of Device Identity in HTTP-Enabled Location Delivery (HELD)

Abstract

   When a Location Information Server receives a request for location
   information (using the locationRequest message), described in the
   base HTTP-Enabled Location Delivery (HELD) specification, it uses the
   source IP address of the arriving message as a pointer to the
   location determination process.  This is sufficient in environments
   where the location of a Device can be determined based on its IP
   address.

   Two additional use cases are addressed by this document.  In the
   first, location configuration requires additional or alternative
   identifiers from the source IP address provided in the request.  In
   the second, an entity other than the Device requests the location of
   the Device.

   This document extends the HELD protocol to allow the location request
   message to carry Device identifiers.  Privacy and security
   considerations describe the conditions where requests containing
   identifiers are permitted.

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in 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/rfc6155.

Winterbottom, et al.         Standards Track                    [Page 1]
RFC 6155                      HELD Identity                   March 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.

Winterbottom, et al.         Standards Track                    [Page 2]
RFC 6155                      HELD Identity                   March 2011

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Applications . . . . . . . . . . . . . . . . . . . . . . .  5
     1.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  6
   2.  Device Identity  . . . . . . . . . . . . . . . . . . . . . . .  6
     2.1.  Identifier Suitability . . . . . . . . . . . . . . . . . .  7
       2.1.1.  Subjective Network Views . . . . . . . . . . . . . . .  7
       2.1.2.  Transient Identifiers  . . . . . . . . . . . . . . . .  9
       2.1.3.  Network Interfaces and Devices . . . . . . . . . . . .  9
     2.2.  Identifier Format and Protocol Details . . . . . . . . . .  9
   3.  Identifiers  . . . . . . . . . . . . . . . . . . . . . . . . . 11
     3.1.  IP Address . . . . . . . . . . . . . . . . . . . . . . . . 11
     3.2.  MAC Address  . . . . . . . . . . . . . . . . . . . . . . . 11
     3.3.  Port Numbers . . . . . . . . . . . . . . . . . . . . . . . 12
     3.4.  Network Access Identifier  . . . . . . . . . . . . . . . . 12
       3.4.1.  Using NAI for Location Configuration . . . . . . . . . 13
     3.5.  URI  . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     3.6.  Fully Qualified Domain Name  . . . . . . . . . . . . . . . 14
     3.7.  Cellular Telephony Identifiers . . . . . . . . . . . . . . 14
     3.8.  DHCP Unique Identifier . . . . . . . . . . . . . . . . . . 15
   4.  Privacy Considerations . . . . . . . . . . . . . . . . . . . . 15
     4.1.  Targets Requesting Their Own Location  . . . . . . . . . . 16
     4.2.  Third-Party Requests . . . . . . . . . . . . . . . . . . . 17

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