Content for  TR 22.952  Word version:  17.0.0

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B.6  eMLPP call to eMLPP subscriber in Priority service + eMLPP networkp. 44

This use case is intended to illustrate that today's existing eMLPP networks are not disturbed by the new Priority Service + eMLPP functionality.
Copy of original 3GPP image for 3GPP TS 22.952, Fig. B.6: eMLPP call to eMLPP subscriber in Priority Service + eMLPP network
Use case 6:
  • Two eMLPP subscribers each with assigned maximum and default priority (precedence) levels in the range of eMLPP1 - eMLPP7 belong to two different old networks (A and D) supporting eMLPP only.
  • The eMLPP subscribers roam to two different new networks supporting both Priority Service and eMLPP (B and C) where they will have priority (precedence) levels in the range of eMLPP3 - eMLPP7.
  • The eMLPP subscriber in (B) sets up an eMLPP call towards the eMLPP subscriber in (C).
  • The call is routed via an intermediate non-3GPP network.
In this use case, the call terminating in (C) is treated as a terminating eMLPP call with the priority level either as requested by the calling subscriber at the call set-up in (B) or, if not requested at call set-up, according to the default priority level assigned to the calling eMLPP subscriber. Priority Service calls should not be pre-empted by eMLPP calls.

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