9.4 MPS for Messaging Services

22.1533GPPMultimedia priority serviceRelease 19TS

9.4.1 General

MPS for Messaging provides priority for messaging services in periods of network congestion during which normal commercial messaging services are degraded.

The system shall support MPS priority for messaging services supported using IMS Messaging, SMS and/or MMS, or MSGin5G for an authorized Service User using a UE with a subscription for MPS.

NOTE 1: MPS for Messaging may make use of commercial messaging service offerings provided by the operator. However, the messaging service applications are not in scope.

NOTE 2: The MPS Service User might not know whether the messaging service is supported using IMS Messaging, SMS and/or MMS, or MSGin5G.

NOTE 3: SMS options in scope are SMS via NAS and SMS over IP (i.e., SMS over MAP and SMS over SGs are not in scope).

The system shall support MPS priority for messaging using SMS and/or MMS or MSGin5G for an authorized IoT device with a subscription for MPS.

NOTE 4: An MPS specialized application on the MPS subscribed IoT device is used to support MPS for Messaging through machine interactions that might not directly involve a human Service User.

9.4.2 Invocation and revocation

9.4.2.1 Invocation

A Service User using a UE with an MPS subscription can activate MPS for Messaging to request priority, e.g., when the normal messaging service is degraded.

The system shall support means for a Service User using a UE with an MPS subscription to activate MPS for Messaging.

NOTE 1: MPS for Messaging invocation is done using a predetermined method (e.g., by the Service User using a web browser to enter a predetermined address such as an URL or sending a message to the MPS operator to activate MPS for Messaging).

A Service User using a UE with an MPS subscription can invoke MPS for Messaging to request priority during roaming, e.g., when the normal messaging service is degraded.

The system shall support means for a Service User using a UE with an MPS subscription to activate MPS for Messaging when roaming within the home country and outside the home country.

NOTE 2: MPS for Messaging invocation is done using a predetermined method recognized by the visited PLMN.

An IoT device with an MPS subscription can invoke MPS for Messaging to request priority when normal messaging service is degraded.

The system shall support means for an authorized IoT device with an MPS subscription to activate MPS for Messaging.

NOTE 3: An MPS specialized application on the MPS subscribed IoT device is responsible for determining whether or not to invoke MPS for Messaging in support of the text communication needs. The MPS specialized application allows invocation/revocation of MPS for Messaging through machine interactions that might not directly involve a human Service User.

An authorized enterprise network supporting MPS activates MPS for Messaging to request priority for MPS subscribed UEs and MPS subscribed IoT devices associated with the enterprise network when normal messaging service is degraded.

The system shall support means for an authorized enterprise network supporting MPS to request activation of MPS for Messaging for the following cases:

– a specific MPS subscribed UE or MPS subscribed IoT device, and

– a group of MPS subscribed UEs or MPS subscribed IoT devices.

NOTE 4: MPS for Messaging invocation done by the enterprise network supporting MPS involves prearrangement and configuration (i.e., subscription arrangement identifying the enterprise network authorization for remote activation of MPS for Messaging) within the MPS Service Provider PLMN. For example, an MPS specialized application hosted in the enterprise network (e.g., IoT application server) might be responsible for determining whether or not to invoke MPS for Messaging. The MPS specialized application allows invocation/revocation of MPS for Messaging through machine interactions that might not directly involve a human Service User.

The system shall support receiving and authenticating MPS for Messaging invocation requests from authorized MPS Service Users using UEs with an MPS subscription and authorized IoT devices with an MPS subscription via public non-3GPP networks.

NOTE 4: The intent of the above requirement is to allow an authorized MPS Service User or authorized IoT device to send a request via the Internet to activate or enable MPS for Messaging.

Based on national/regional regulatory rules and operator policy, the system shall support means to activate:

– MPS for Messaging separately from MPS for DTS described in clause 9.2, or

– MPS for Messaging and MPS for DTS together.

NOTE 5: The intent of the above requirement is to allow the MPS Service Provider flexibility to activate/revoke MPS for Messaging and MPS for DTS separately or in combination.

9.4.2.2 Revocation

The system shall support means to revoke MPS for Messaging for the cases:

– a Service User using a UE with an MPS subscription, and

– an IoT device with an MPS subscription.

The system shall support means for an authorized enterprise network supporting MPS to explicitly request to revoke MPS for Messaging for a individual or group of MPS subscribed UEs or MPS subscribed IoT devices while maintaining basic connectivity to the MPS subscribed UE(s) or MPS subscribed IoT device(s).

The system shall support means for a Service User to explicitly revoke MPS for Messaging from a UE with an MPS subscription when roaming, including outside the home country.

If MPS for Messaging is not explicitly revoked by the Service User or IoT device, the system in the RPLMN shall automatically revoke MPS upon UE detachment/deregistration (e.g., power down).

The system shall support means for an authorized IoT device with an MPS subscription to revoke MPS for Messaging.

The system shall automatically revoke MPS when the maximum allowed duration for MPS for Messaging is reached.

Based on national/regional regulatory rules and operator policy, the system shall support means to revoke:

– MPS for Messaging separately from MPS for DTS described in clause 9.2, or

– MPS for Messaging and MPS for DTS together.

NOTE 5: The intent of the above requirement is to allow the MPS Service Provider flexibility to activate/revoke MPS for Messaging and MPS for DTS separately or in combination.

9.4.3 Authentication and authorization

The system shall support means to authenticate and authorize an MPS for Messaging activation request from a UE with an MPS subscription.

The system shall support means for a visited PLMN, including a visited PLMN outside of the home country, to verify with the home PLMN that a UE is authorized for MPS, and to authorize MPS for Messaging.

NOTE 1: For a UE with an MPS subscription, the subscription related information stored in the UE and/or operator network is used, e.g., membership in a special access class as per TS 22.011 [6] is used for EUTRAN access to the EPC and membership in Access Identity 1 as per TS 22.261 [7] is used for 5G (NR and E-UTRAN access to the 5GC).

NOTE 2: The method for authenticating and authorizing a UE for MPS when roaming is based on operator policy and roaming agreements between the visited PLMN and home PLMN for MPS as per clause 5.8.

The system shall support means to authenticate and authorize an MPS for Messaging activation request from an IoT device with an MPS subscription.

The system shall support means to authenticate and authorise an enterprise network that supports MPS when it requests activation of MPS for Messaging for the following cases:

– a specific MPS subscribed UE or MPS subscribed IoT device, and

– a group of MPS subscribed UEs or MPS subscribed IoT devices.

9.4.4 Signalling

The system shall provide priority treatment to the invocation signalling in the network once the MPS for Messaging request is identified by the system.

The system shall support a means for MPS for Messaging activation when normal messaging service is congested.

9.4.5 Message origination and termination

9.4.5.1 IMS Messaging

When MPS for Messaging is authorized and activated for an originating UE with a subscription for MPS using IMS Messaging for the messaging service, the system shall provide:

– end to end priority treatment for point to point messages when the recipient(s) is using IMS Messaging regardless whether the recipient(s) have a subscription for MPS, and

– priority treatment for messages to/from the Message Service Center.

When MPS for Messaging is authorized and activated for a terminating UE with a subscription for MPS using IMS Messaging for the messaging service, the system shall provide priority treatment for all messages to/from the Message Service Center.

When a terminating network receives an incoming message with an MPS for Messaging indication, the message shall receive priority treatment in the terminating PLMN.

NOTE: End to end priority can be provided by the 3GPP system for the point to point messages when both the originating UE and the destination UE are using IMS Messaging service. When the originating UE is using IMS Messaging service but the destination UE is not using IMS Messaging service, priority treatment is provided by the 3GPP system only to/from the Message Service Center.

9.4.5.2 SMS and MMS

When MPS for Messaging is authorized and activated for a UE or IoT device with a subscription for MPS using SMS or MMS for the messaging service, the system shall provide priority treatment for all messages to/from the Message Service Center.

NOTE 1: The SMS and MMS platforms and inter system aspects are outside 3GPP scope.

NOTE 2: The above requirement is not applicable for SMS over MAP and SMS over SGs.

9.4.5.3 MSGin5G

When MPS for Messaging is authorized and activated for an originating UE or IoT device with a subscription for MPS using MSGin5G for the messaging service, the system shall provide:

– end to end priority treatment for point to point messages when the recipient(s) is using MSGin5G regardless whether the recipient(s) have a subscription for MPS, and

– priority treatment for messages to/from the Message Service Center.

When MPS for Messaging is authorized and activated for a terminating UE or IoT device with a subscription for MPS using MSGin5G for the messaging application service, the system shall provide priority treatment for all messages to/from the Message Service Center.

When a terminating network receives an incoming message with an MPS for Messaging indication, the message shall receive priority treatment in the terminating PLMN.

NOTE 1: End to end priority can be provided by the 3GPP system for the point to point messages when both the originating UE and the destination UE are using MSGin5G service. When the originating UE is using MSGin5G but the destination UE is not using MSGin5G, priority treatment is provided by the 3GPP system only to/from the Message Service Center.

NOTE 2: MSGin5G is only applicable to 5GS.

9.4.8 Security

The system shall support security capabilities to verify an enterprise network’s authorization to request MPS for Messaging activation.