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Content for  TS 23.303  Word version:  16.0.0

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5.7  ProSe impacts to EPC proceduresWord‑p. 121

5.7.0  General |R15|

The impact to EPC procedures described in the subsequent clauses apply for EUTRA-based PC5 only.

5.7.1  E-UTRAN attach procedure for ProSe-enabled UEs

E-UTRAN attach for ProSe-enabled UE is performed as defined in TS 23.401 with the following additions:
  • ProSe-enabled UE includes the ProSe capability indication as part of the "UE Network Capability" in the Attach Request message. MME stores this information for ProSe operation. ProSe capability can indicate whether the UE is capable of supporting one or more of the following ProSe direct services: ProSe Direct Discovery, ProSe Direct Communication and ProSe UE-to-Network Relay.
  • If the MME is configured to indicate "ProSe authorised" to E-UTRAN, the UE is ProSe-enabled, and the UE is authorised to use ProSe direct services based on the subscription data, the MME shall include a "ProSe authorised" indication in the S1 AP Initial Context Setup Request, indicating which of the ProSe direct services the UE is authorised to use. If the UE's "ProSe authorised" status indicates the UE is not authorised to act as UE-to-Network Relay, then the eNodeB shall not authorise the UE to use radio resources for Relay.
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5.7.2  Service Request procedures for ProSe-enabled UEsWord‑p. 122
Service Request procedures for ProSe-enabled UE are performed as defined in TS 23.401 with the following additions:
  • If the MME is configured to indicate "ProSe authorised" to E-UTRAN, the UE is ProSe-enabled, and the UE is authorised to use ProSe direct services based on the subscription data, the MME shall include a "ProSe authorised" indication in the S1 AP Initial Context Setup Request, indicating which of the ProSe direct services the UE is authorised to use. If the UE's "ProSe authorised" status indicates the UE is not authorised to act as UE-to-Network Relay, then the eNodeB shall not authorise the UE to use radio resources for Relay.
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5.7.3  PS Handover procedures for ProSe-enabled UEs

Intra-E-UTRAN S1-based handover or the Inter-RAT to E-UTRAN handover procedures for ProSe-enabled UE are performed as defined in TS 23.401 with the following additions:
  • If the MME is configured to indicate "ProSe authorised" to E-UTRAN, the UE is ProSe-enabled, and the UE is authorised to use ProSe direct services based on the subscription data, the target MME shall send the "ProSe authorised" indication to the target eNodeB as follows:
    • For the intra MME handover, the "ProSe authorized" indication is included in the S1-AP handover Request message. If after the handover procedure, the "ProSe authorized" indication is changed, the updated "ProSe authorized" indication is included in the S1-AP UE Context Modification Request message sent to the target eNodeB.
    • For the inter MME handover or Inter-RAT handover to E-UTRAN, the "ProSe authorized" indication is included in the S1-AP UE Context Modification Request message sent to the target eNodeB after the handover procedure. If the UE's "ProSe authorised" status indicates the UE is not authorised to act as UE-to-Network Relay, then the eNB shall not authorise the UE to use radio resources for Relay.
For X2-based handover, the "ProSe authorized" indication is sent to target eNodeB as follows:
  • If the source eNodeB is ProSe-enabled and the "ProSe authorized" indication is included in the UE context, the source eNodeB shall include a "ProSe authorised" indication in the X2-AP Handover Request message to the target eNodeB.
  • If the MME is configured to indicate "ProSe authorised" to E-UTRAN, the UE is ProSe-enabled, and the UE is authorised to use ProSe direct services based on the subscription data, the MME shall send the "ProSe authorised" indication to the target eNodeB in the Path Switch Request Acknowledge message. If after the handover procedure, the "ProSe authorized" indication is changed, the updated "ProSe authorized" indication is included in the S1-AP UE Context Modification Request message sent to the target eNodeB. If the UE's "ProSe authorised" status indicates the UE is not authorised to act as UE-to-Network Relay, then the eNB shall not authorise the UE to use radio resources for Relay.
The "ProSe authorised" indication sent to target eNodeB denotes which of the ProSe direct services UE is authorized to use.
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5.7.4  Tracking Area Update procedure for ProSe-enabled UEs

Tracking Area Update procedures for ProSe-enabled UE are performed as defined in TS 23.401 with the following additions:
  • ProSe-enabled UE includes the ProSe capability indication as part of the "UE Network Capability" in the Tracking Area Update Request message. MME stores this information for ProSe operation.
  • If the MME is configured to indicate "ProSe authorised" to E-UTRAN and determines to re-establish the radio and S1 bearers for all active EPS bearer contexts due to the "active" flag included in the Tracking Area Update Request message or the pending downlink data or signalling, the UE is ProSe-enabled, and the UE is authorised to use ProSe direct services based on the subscription data, the MME shall include a "ProSe authorised" indication in the S1-AP Initial Context Setup Request. If the UE's "ProSe authorised" status indicates the UE is not authorised to act as UE-to-Network Relay, then the eNodeB shall not authorise the UE to use radio resources for Relay.
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5.7.5  Insert Subscriber Data procedure for ProSe-enabled UEsWord‑p. 123
Insert Subscriber Data procedure for ProSe-enabled UE are performed as defined in TS 23.401 with the following additions:
  • If the "ProSe authorised" indication needs to be changed due to the changed subscription data and the S1 bearer is established, the MME shall notify the eNodeB the updated "ProSe authorised" indication via the S1-AP UE Context Modification Request message.

5.7.6  Delete Subscriber Data procedure for ProSe-enabled UEs

Delete Subscriber Data procedure for ProSe-enabled UE is performed as defined in TS 29.272 with the same additions as in clause 5.7.5.


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