MC xApp 5G EN-DC Measurement and KPI Computation xApp Developed by Rajarajan Sivaraj, Theodore Johnson, Vladislav Shkapenyuk Additional Credits: Matti Hiltunen, Gueyoung Jung, Scott Daniels AT&T Labs Research

In the MC xApp, we compute 5G KPIs at customized fine-grained granularities in the following manner:

• On a per-UE per-bearer basis
• On a per-UE basis
• On a UE-group basis
• On an NR cell-wide basis
• On an NR gNB-wide basis

We identify individual UEs across multiple EN-DC sessions by the s1-UL-GTPtunnelEndpoint IE in 3GPP X2AP: SgNB Addition Request message, as long as they remain connected to the same eNB. We identify UE groups based on (i) QCI, (ii) E-RAB-ID, (iii) (QCI, ARP) value pair, etc. We identify NR cell based on the NR-PCI or the Physical Cell Identity We identify the NR gNB based on the gNB ID Information Element (IE) received in the RMR X2AP streaming header

The key 3GPP EN-DC X2AP procedures that we handle in the MC xApp include:

• SgNB Addition
• SgNB Release
• SgNB Modification
• RRC Transfer
• Secondary RAT Data Usage Report