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Content for  TR 22.952  Word version:  18.0.1

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5 Call flows 
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5  Call flows  p. 16

This clause is intended to facilitate understanding of Priority Service and paraphrases information that is detailed in 3GPP specifications. This clause provides an illustration of a possible way the capabilities described in this document may be implemented to support Priority Service.
This clause describes various call flows that illustrate how Priority Service calls can be processed. Messages between the MSC and VLR are not shown in the figures nor described in the text following the figures since the MSC-VLR interface is not standardized. Required timers are not shown in the figures but are described in the text. The call flows assume that MS support of eMLPP is not required (i.e., eMLPP compatible handsets are not required). The call flows also assume that queuing due to the lack of radio resources or resources between the BSS and MSC is done at the BSS.
Standard 3GPP authentication and ciphering procedures are applicable to all call flows but are not depicted.
The following call flows are illustrated:
  1. Priority Service Call Origination - Radio Resources Available, Call Not Queued,
  2. Priority Service Call Termination - Radio Resources Available, Call Not Queued,
  3. Priority Service Call Origination - Radio Resources Unavailable, Call Queued,
  4. Priority Service Call Termination - Radio Resources Unavailable, Call Queued,
  5. Priority Service Call Origination - Radio Resources Unavailable and Queue Full,
  6. Priority Service Call Termination - Radio Resources Unavailable and Queue Full,
  7. Priority Service Call Origination - Radio Resources Unavailable and Queue Timeout,
  8. Priority Service Call Termination - Radio Resources Unavailable and Queue Timeout,
  9. Priority Service Call Origination - Radio Resources Unavailable, Queue Full, but Higher Priority,
  10. Priority Service Call Termination - Radio Resources Unavailable, Queue Full, but Higher Priority,
  11. Priority Service Call Progression - MSC - Outgoing Trunk Queuing,
  12. Priority Service Call Progression - MSC - Outgoing Trunk Queuing - Timeout,
  13. Priority Service Call Attempt by a Non-Service User - Priority Service Denied.
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