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Content for  TS 38.401  Word version:  18.0.0

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8.16  Overall procedures for CPAC |R17|p. 104

The following clauses describe the overall procedures for CPAC involving E1 and F1.

8.16.1  MN initiated Conditional PSCell Additionp. 104

The procedure for MN initiated Conditional PSCell Addition (CPA) is shown in Figure 8.16.1-1.
Reproduction of 3GPP TS 38.401, Fig. 8.16.1-1: Conditional Secondary Node Addition procedure
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Step 1-12.
The steps 1-12 are as defined in TS 37.340.
Step a1-a5.
The steps a1-a5 are as defined in clause 8.9.2 and with conditional indications.
Step a6.
After Random Access procedure successfully performed at the candidate gNB-DU which becomes the target SN gNB-DU, the target gNB-DU sends a Downlink Data Delivery Status frame to inform the target gNB-CU-UP. The target gNB-DU also sends an ACCESS SUCCESS message to inform the target gNB-CU-CP of which cell the UE has successfully accessed.
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8.16.2  MN initiated conditional SN Changep. 105

The procedure for MN initiated conditional SN Change refer to TS 37.340. In case of split gNB architecture, the procedures between gNB-CU and gNB-DU and the procedures between gNB-CU-CP and gNB-CU-UP refer to clause 8.16.1.

8.16.3  SN initiated conditional inter-SN Changep. 105

The procedure for SN initiated conditional SN Change refer to TS 37.340. In case of split gNB architecture, the procedures between gNB-CU and gNB-DU and the procedures between gNB-CU-CP and gNB-CU-UP refer to clause 8.16.1.

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