Content for TR 22.952 Word version: 18.0.1

0… 4… 4.8… 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.11 5.12 5.13 6… A… B B.1 B.2 B.3 B.4 B.5 B.6 B.7 B.8 B.9 C D…

B.3 Priority service call to eMLPP subscriber in Priority service only network
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B.3 Priority service call to eMLPP subscriber in Priority service only network p. 41

This use case is intended to illustrate that Priority Service is not disturbed by eMLPP for terminating Priority Service calls.

Copy of original 3GPP image for 3GPP TS 22.952, Fig. B.3: Priority Service call to eMLPP subscriber in Priority Service only network

Figure B.3: Priority Service call to eMLPP subscriber in Priority Service only network
(⇒ copy of original 3GPP image)

Use case 3:

A Service User with an assigned Priority Service level in the range of Priority Service1 - Priority Service5 belongs to a new network (A) supporting Priority Service only,
The Service User roams to a new network (B) supporting both Priority Service and eMLPP.
An eMLPP subscriber with assigned maximum and default priority (precedence) levels in the range of eMLPP1 - eMLPP7 belongs to a new network (D) supporting both Priority Service and eMLPP.
The eMLPP subscriber roams to a new network (C) supporting Priority Service only.
The Service User in (B) sets up a Priority Service call towards the eMLPP subscriber in (C).
The call is routed via an intermediate non-3GPP network.

In this use case, the call receives Priority Service treatment (priority access to traffic channels) on the terminating side in (C) according to the Priority Service level assigned to the calling Service User. The eMLPP subscriber roaming from (D) to (C) is treated as a normal subscriber in (C).