urces and SSB(s), the association between RACH resources and UE-specific CSI-RS configuration(s), common RACH resources, and the SI of the target cell. 8. The source gNB sends the SN Status Transfer message to the target gNB. 9. The UE synchronizes to the target cell and completes the RRC handover procedure by sending RRCReconfigurationComplete message to target gNB. New Radio Access Layer 2/3 Aspects and System Operation 263 10. The target gNB sends a Path Switch Request message to the AMF to trigger 5GC to switch the downlink data path toward the target gNB and to establish an NG-C inter- face instance toward the target gNB. 11. 5GC switches the downlink data path toward the target gNB. The UPF sends one or more end-marker packets on the old path to the source gNB per PDU session/tunnel and then can release any user-plane/TNL resources toward the source gNB. 12. The AMF confirms the Path Switch Request message with the Path Switch Request Acknowledge message. 13. Upon reception of the Path Switch Request Acknowledge message from the AMF the target gNB sends the UE Context Release message to inform the source gNB about the success of the handover. The source gNB can then release radio and control-plane- related resources associated to the UE context. Any ongoing data forwarding continue. The RRM configuration can include both beam measurement information (for layer 3 mobil- ity) associated to SSB(s) and CSI-RS(s) for the reported cell(s), if both types of measure- ments are available. Also, if carrier aggregation is configured, the RRM configuration can include the list of best cells on each frequency for which measurement information is avail- able. The RRM measurement information can also include the beam measurement for the listed cells that belong to the target gNB. The common RACH configuration for beams in the target cell is only associated to the SSB(s). The network can have dedicated RACH configurations associated to the SSB(s) and/or have dedicated RACH configurations associated to CSI-RS(s) within a ce