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Network Working Group C. Holmberg
Internet-Draft J. Axell
Intended status: Informational Ericsson
Expires: July 24, 2017 January 20, 2017
IANA Registration of New Session Initiation Protocol (SIP) Resource-
Priority Namespace for Mission Critical Push To Talk service
draft-holmberg-dispatch-mcptt-rp-namespace-05
Abstract
This document creates an additional Session Initiation Protocol (SIP)
Resource-Priority namespace to meet the requirements of the 3GPP
defined Mission Critical Push To Talk, and places this namespace in
the IANA registry.
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
working documents as Internet-Drafts. The list of current Internet-
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
material or to cite them other than as "work in progress."
This Internet-Draft will expire on July 24, 2017.
Copyright Notice
Copyright (c) 2017 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.
Holmberg & Axell Expires July 24, 2017 [Page 1]
Internet-Draft MCPTT R-P namespace January 2017
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Applicability . . . . . . . . . . . . . . . . . . . . . . . . 3
3. New SIP Resource-Priority Namespaces Created . . . . . . . . 3
3.1. Introduction . . . . . . . . . . . . . . . . . . . . . . 3
3.2. The MCPTT namespaces . . . . . . . . . . . . . . . . . . 3
4. Security Considerations . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 5
7. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . 5
8. Normative References . . . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
The Third Generation Partnership Project (3GPP) has defined a Mission
Critical Push To Talk (MCPTT) over LTE service [TS.3GPP.22.179] . The
MCPTT service supports an enhanced PTT service, suitable for mission
critical scenarios, based upon 3GPP Evolved Packet System (EPS)
services. The requirements for the MCPTT service defined within 3GPP
can also form the basis for a non-mission critical Push To Talk (PTT)
service.
The MCPTT service is intended to support communication between
several users (a group call), where each user can gain permission to
talk in an arbitrated manner. However, the MCPTT service also
supports private calls between pairs of users.
MCPTT is primarily targeted to provide a professional Push To Talk
service to e.g., public safety, transport companies, utilities or
industrial and nuclear plants. In addition to this, a commercial PTT
service for non-professional use (e.g., groups of people on holiday)
may be delivered through an MCPTT system. Based on their operational
model, the performance and MCPTT features in use vary per user
organization, where functionality which is more mission critical
specific (e.g., Imminent Peril Call) might not be available to
commercial customers.
The MCPTT service provides its users with different priorities for
the access to network resources in order to provide means to
prioritize between calls when resources are scarce. These priorities
take into account among other things the priority and role of the
caller, the priority and type of the group, and the situation in
which the call is made.
The SIP level call control procedures using these namespaces are
specified in [TS.3GPP.24.379]. The namespaces defined here will
Holmberg & Axell Expires July 24, 2017 [Page 2]
Internet-Draft MCPTT R-P namespace January 2017
support a wide range of queuing options. The namespaces correspond
to what can be supported over the 3GPP Rx interface, defined in
[TS.3GPP.29.214]. The usage of the namespaces can be tailored to the
needs of the operator. The mechanism to do this is to configure
which values a specific user is allowed to use. This configuration
is specified in [TS.3GPP.24.384].
High priority calls when there is danger of life, for either the
public safety worker or any other human, need to be set up
immediately and thus require preemption. Other calls may be less
sensitive in call set-up time but have a high priority once
established. For these calls a queueing mechanism is more
appropriate. The MCPTT data transfer service currently under
development can benefit from a queueing mechanism. Another example
is video only calls that are not critical in call set-up time, but
where keeping the call is important.
This document creates additional Session Initiation Protocol (SIP)
Resource-Priority namespaces to meet the requirements of the 3GPP
defined Mission Critical Push To Talk, and places these namespaces in
the IANA registry.
2. Applicability
This document defines namespaces applicable for MCPTT services
defined by 3GPP that use the network services of a 3GPP defined LTE
network. The use of this namespace outside such networks is
undefined.
3. New SIP Resource-Priority Namespaces Created
3.1. Introduction
This document introduces the MCPTT namespaces mcpttp and mcpttq, the
name coming from the 3GPP defined Mission Critical Push To Talk
service.
3.2. The MCPTT namespaces
The mcpttp namespace uses the priority levels listed below from
lowest to highest priority.
mcpttp.0 (lowest priority)
mcpttp.1
mcpttp.2
mcpttp.3
mcpttp.4
mcpttp.5
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mcpttp.6
mcpttp.7
mcpttp.8
mcpttp.9
mcpttp.10
mcpttp.11
mcpttp.12
mcpttp.13
mcpttp.14
mcpttp.15 (highest priority)
Intended algorithm for mcpttp is preemption.
New Warning code: No.
New SIP response code: No.
The mcpttq namespace uses the priority levels listed below from
lowest to highest priority.
mcpttq.0 (lowest priority)
mcpttq.1
mcpttq.2
mcpttq.3
mcpttq.4
mcpttq.5
mcpttq.6
mcpttq.7
mcpttq.8
mcpttq.9
mcpttq.10
mcpttq.11
mcpttq.12
mcpttq.13
mcpttq.14
mcpttq.15 (highest priority)
Intended algorithm for mcpttq is queuing.
New Warning code: No.
New SIP response code: No.
4. Security Considerations
This document does not have any impact on the security of the SIP
MCPTT protocol. Its purpose is purely administrative in nature.
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5. IANA Considerations
Abiding by the rules established within [RFC4412] and [RFC7134] ,
this is an Informative RFC creating two new namespaces, their
associated priority-values, and intended algorithms.
6. Acknowledgments
The authors would like to thank Bob Fredericks, Baruh Hason, Mary
Barnes and Keith Drage for comments and discussions.
7. Change Log
[RFC EDITOR NOTE: Please remove this section when publishing]
Changes from draft-holmberg-dispatch-mcptt-rp-namespace-04.
o - Editorial changes based on gen-art review. Renderin of authors
name and address fixed.
Changes from draft-holmberg-dispatch-mcptt-rp-namespace-03.
o - Editorial changes based on sec- and opt- directorate reviews.
Changes from draft-holmberg-dispatch-mcptt-rp-namespace-01.
o - Removal of Conventions section.
o - Editorial changes.
Changes from draft-holmberg-dispatch-mcptt-rp-namespace-00.
o - The two namespaces have been spelt out explicitly.
o - The numbering of priority levels is changed from 1-16 to 0-15.
o - Address of one author has changed.
8. Normative References
[RFC4412] Schulzrinne, H. and J. Polk, "Communications Resource
Priority for the Session Initiation Protocol (SIP)",
RFC 4412, DOI 10.17487/RFC4412, February 2006,
<http://www.rfc-editor.org/info/rfc4412>.
[RFC7134] Rosen, B., "The Management Policy of the Resource Priority
Header (RPH) Registry Changed to "IETF Review"", RFC 7134,
DOI 10.17487/RFC7134, March 2014,
<http://www.rfc-editor.org/info/rfc7134>.
Holmberg & Axell Expires July 24, 2017 [Page 5]
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[TS.3GPP.22.179]
3GPP, "3rd Generation Partnership Project; Technical
Specification Group Services and System Aspects; Mission
Critical Push To Talk (MCPTT) over LTE; Stage 1", 3GPP
TS 22.179 13.3.0, December 2015.
[TS.3GPP.29.214]
3GPP, "3rd Generation Partnership Project; Technical
Specification Group Core Network and Terminals; Policy and
Charging Control over Rx reference point;", 3GPP TS 29.314
13.7.0, September 2016.
[TS.3GPP.24.379]
3GPP, "3rd Generation Partnership Project; Technical
Specification Group Core Network and Terminals; Mission
Critical Push To Talk (MCPTT) call control; Protocol
specification;", 3GPP TS 24.379 13.2.0, September 2016.
[TS.3GPP.24.384]
3GPP, "3rd Generation Partnership Project; Technical
Specification Group Core Network and Terminals; Mission
Critical Push To Talk (MCPTT) configuration management;
Protocol specification", 3GPP TS 24.384 13.2.0, September
2016.
Authors' Addresses
Christer Holmberg
Ericsson
Hirsalantie 11
Jorvas 02420
Finland
Email: christer.holmberg@ericsson.com
Joergen Axell
Ericsson
Groenlandsgatan 31
Stockholm 16480
Sweden
Email: jorgen.axell@ericsson.com
Holmberg & Axell Expires July 24, 2017 [Page 6]
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