A Routing Request Extension for the HTTP-Enabled Location Delivery (HELD) Protocol
RFC 7840

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Internet Engineering Task Force (IETF)                   J. Winterbottom
Request for Comments: 7840                   Winterb Consulting Services
Updates: 5985, 6881                                        H. Tschofenig
Category: Standards Track
ISSN: 2070-1721                                                 L. Liess
                                                        Deutsche Telekom
                                                                May 2016

                    A Routing Request Extension for
           the HTTP-Enabled Location Delivery (HELD) Protocol

Abstract

   For cases where location servers have access to emergency routing
   information, they are able to return routing information with the
   location information if the location request includes a request for
   the desired routing information.  This document specifies an
   extension to the HTTP-Enabled Location Delivery (HELD) protocol that
   updates RFC 5985 to support this function.  Allowing location and
   routing information to be acquired in a single request response
   exchange updates RFC 6881, as current location acquisition and route
   determination procedures are separate operations.

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/rfc7840.

Winterbottom, et al.         Standards Track                    [Page 1]
RFC 7840                      HELD Routing                      May 2016

Copyright Notice

   Copyright (c) 2016 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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  LoST Reuse Considerations . . . . . . . . . . . . . . . .   6
   4.  Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Modification to Phone BCP . . . . . . . . . . . . . . . . . .   7
   6.  HELD Schema Extension . . . . . . . . . . . . . . . . . . . .   8
   7.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   8.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  12
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
     10.1.  URN Sub-Namespace Registration for
            'urn:ietf:params:xml:ns:geopriv:held:ri' . . . . . . . .  13
     10.2.  XML Schema Registration  . . . . . . . . . . . . . . . .  13
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  14
     11.2.  Informative References . . . . . . . . . . . . . . . . .  14
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

Winterbottom, et al.         Standards Track                    [Page 2]
RFC 7840                      HELD Routing                      May 2016

1.  Introduction

   The general Emergency Context Resolution with Internet Technology
   (ECRIT) calling models described in [RFC6443] and [RFC6881] require a
   local Location-to-Service Translation (LoST) server or network of
   forest guides in order to determine the address of the Public Safety
   Answering Point (PSAP) in the best position to handle a call.
   Networks of forest guides have not materialized and while PSAPs are
   moving towards IP networks, LoST server deployment is not ubiquitous.
   Some regions and countries have expressed reluctance to deploy LoST
   servers making aspects of the current ECRIT architecture hard to
   realize.

   To address regulatory requirements, such as [M493], evolving
   architectures in Europe couple location and routing information in
   the access network while using a softswitch-centric approach to