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INFORMATIONAL
Internet Engineering Task Force (IETF)                       C. Holmberg
Request for Comments: 8101                                      J. Axell
Category: Informational                                         Ericsson
ISSN: 2070-1721                                               March 2017
IANA Registration of New Session Initiation Protocol (SIP) Resource-Priority Namespace for Mission Critical Push To Talk Service

Abstract

This document creates additional Session Initiation Protocol (SIP) Resource-Priority namespaces to meet the requirements of the 3GPP-defined Mission Critical Push To Talk (MCPTT) and places these namespaces in the corresponding IANA registry.

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 7841.

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/rfc8101.

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.
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RFC 8101                   MCPTT R-P Namespace                March 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 . . . . . . . . . . . . . . . . . . . 5
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
6. Normative References . . . . . . . . . . . . . . . . . . . . 5
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 6 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 Push To Talk (PTT) service that is suitable for mission critical scenarios and is based upon 3GPP Evolved Packet System (EPS) services. The requirements for the MCPTT service defined within 3GPP can also form the basis for other PTT services.

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 PTT service to, e.g., public safety, transport companies, utilities, and 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 that 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. Among other things, these priorities take into account 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 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].
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RFC 8101                   MCPTT R-P Namespace                March 2017
High-priority calls (when the life of either a public safety worker or anyone else is in danger) need to be set up immediately; thus, they require preemption. Other calls may be less sensitive in call setup 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 setup time but where keeping the call is important.

This document creates additional SIP Resource-Priority namespaces to meet the requirements of the 3GPP-defined MCPTT 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 following MCPTT namespaces: mcpttp and mcpttq. The names of which come from the 3GPP-defined MCPTT 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 mcpttp.6
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RFC 8101                   MCPTT R-P Namespace                March 2017
mcpttp.7

mcpttp.8

mcpttp.9

mcpttp.10

mcpttp.11

mcpttp.12

mcpttp.13

mcpttp.14

mcpttp.15 (highest priority)

The Namespace Numerical Value is 46.

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
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RFC 8101                   MCPTT R-P Namespace                March 2017
mcpttq.10

mcpttq.11

mcpttq.12

mcpttq.13

mcpttq.14

mcpttq.15 (highest priority)

The Namespace Numerical Value is 47.

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.
5.  IANA Considerations
Abiding by the rules established within [RFC4412] and [RFC7134], this is an Informational RFC creating two new namespaces, their associated priority-values, and intended algorithms.
6.  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>.
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RFC 8101                   MCPTT R-P Namespace                March 2017
[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 29.214 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.

Acknowledgments

The authors would like to thank Bob Fredericks, Baruh Hason, Mary Barnes, and Keith Drage for comments and discussions.

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 Informational [Page 6]

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