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