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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
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   Internet-Drafts are draft documents valid for a maximum of six months
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   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
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.



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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



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   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>.





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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








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