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Content for  TR 22.854  Word version:  17.1.0

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0  IntroductionWord‑p. 7

The present document provides a study to identify where updates may be needed to TR 22.953 and TS 22.153 to account for current and anticipated MPS User needs for priority voice, data, and video communication capabilities.

1  ScopeWord‑p. 8

The present document studies voice, data transport, and video use cases and identifies potential requirements for Multimedia Priority Service (MPS). It identifies where updates are needed to TR 22.953 and TS 22.153 to account for current and anticipated MPS User needs for priority voice, data, and video communication capabilities.
The present document provides use cases and the associated potential new stage 1 requirements beyond those documented in TR 22.953. Example use cases include:
  • MPS for Voice: MPS for MMTEL voice and voice teleconferencing invoked from a subscribed UE, and MPS for MMTEL voice teleconferencing invoked from a voice server by the host,
  • MPS for Data Transport Service (DTS): MPS DTS communications invoked from a subscribed UE, a subscribed IoT device, and from an enterprise network, and
  • MPS for Video: MPS for MMTEL video, MMTEL video conferencing, and streaming video invoked from a subscribed UE and MPS for video teleconferencing invoked from a video server by the host.
The present document also include security considerations.
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2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 22.153: "Multimedia priority service".
[3]
TR 22.953: "Multimedia Priority Service feasibility study".
[4]
TS 22.340: "IP Multimedia Subsystem (IMS) messaging; Stage 1".
[5]
TS 22.261: "Service requirements for next generation new services and markets".
[6]
RFC 8443:  "Personal Assertion Token (PASSporT) Extension for Resource Priority Authorization".
[7]
TS 24.229: "IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".
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3  Definitions and abbreviationsWord‑p. 9

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3.2  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
DTS
Data Transport Service
MMTEL
Multimedia Telephony
MPS
Multimedia Priority Service
NS/EP
National Security / Emergency Preparedness
OTT
Over-The-Top
PASSPorT
Personal Assertion Token
PIN
Personal Identification Number
SIP RPH
Session Initiation Protocol Resource Priority Header
VPN
Virtual Private Network
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4  Overview

4.1  Service descriptions from user perspective

4.1.1  MPS for voice

The primary purpose of MPS for Voice is to provide the Service User with priority voice communication sessions in periods of severe network congestion during which normal commercial voice service is degraded. MPS for Voice provides priority for MMTEL voice and MMTEL voice teleconferencing sessions.
In most scenarios during a National Security / Emergency Preparedness (NS/EP) condition, it is expected that MPS for Voice is activated in response to service degradation or when the Service User is aware of network congestion. In limited situations, e.g., when in an area with network congestion, it is possible to proactively invoke MPS for Voice. In all cases, basic connectivity is required in advance of priority service invocation, and special consideration needs to be provided to permit service invocation messages to be delivered during times of congestion.
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4.1.2  MPS for DTS

The primary purpose of the MPS for Transport Service (DTS) is to provide the Service User with priority for applications using the default bearer (in the case of 4G), default QoS flow (in the case of 5G) to one or more selected active Packet Data Networks (PDNs)/Data Networks (DNs) in periods of severe network congestion during which normal commercial data service is degraded. It includes access to an enterprise network (e.g., government agency private enterprise network).
In most scenarios during NS/EP condition, it is expected that the DTS is activated in response to service degradation due to network congestion. In limited situations, e.g., when driving into an area with network congestion, it is possible to proactively invoke the DTS. In all cases, basic connectivity is required in advance of priority service invocation, and special consideration needs to be provided to permit service invocation messages to be delivered during times of congestion.
For enterprise access, a Virtual Private Network (VPN) connection is generally established via the originating access network, core network, and the terminating access network to the enterprise network. In this case, the DTS is the means to achieve improved throughput/performance in times of severe network congestion.
For an IoT device, MPS for DTS provides the IoT device with priority for applications using a specific default bearer (in the case of 4G), default QoS flow (in the case of 5G) towards a single specified PDN/DN, and in the case of IoT connectivity with an enterprise, also provides priority for the terminating access network to the enterprise.
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4.1.3  MPS for videoWord‑p. 10

The primary purpose of MPS for Video is to provide the Service User with priority video communication sessions in periods of severe network congestion during which normal commercial video service is degraded. MPS for Video provides priority for MMTEL video, streaming video, and MMTEL video teleconferencing sessions.
Priority for Over-The-Top (OTT) video obtained via the use of the DTS is not part of MPS for Video.
In most scenarios during an NS/EP condition, it is expected that MPS for Video is activated in response to service degradation or when the Service User is aware of network congestion. In limited situations, e.g., when in an area with network congestion, it is possible to proactively invoke MPS for Video. In all cases, basic connectivity is required in advance of priority service invocation, and special consideration needs to be provided to permit service invocation messages to be delivered during times of congestion.
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