Customer Network Support Engineer
- Solution & data model: Clear understanding of the overall UDC/UDM solution, including how CUDB/UDR, HLR-FE, HSS-FE, EIR-FE, CCRC, CCSM and CCDM fit together; subscriber data models in CUDB, including keys, indexes and replication; and how subscription changes flow from CCDM to FEs and onwards to EPC/IMS and PACO.
- Key protocols & interfaces: Strong Diameter skills, including S6a/S6d, Cx, Sh, Gr, SLh and Ud-type interfaces; MAP basics where legacy still exists; and awareness of 5G UDM interfaces such as Nudm, enabling trace reading and mapping of errors to specific nodes and parameters.
- FE behaviour (HLR-FE / HSS-FE / EIR-FE): Understanding of how these FEs behave in attach, RAU/LAU, EPS attach, IMS registration, authentication, subscription download/update and barring/roaming scenarios; plus EIR IMEI checks and their impact on attach/registration, enabling quick separation of “data issues” from “equipment issues.”
- Platform & cloud (CCSM + infrastructure): Comfort with CCSM concepts, including NFs, pods, instances, scaling, Day-0/Day-1 parameters and Diameter endpoints; Linux and basic Kubernetes/container troubleshooting, including logs, pods, CPU/RAM/disk; and reading CNF alarms/KPIs related to UDM/HSS-IMS.
- Provisioning & data operations (CCDM/CUDB): Understanding of CCDM order flows, typical failures, bulk operations and migrations; ability to carry out safe subscriber-data corrections, consistency checks between CCDM/CUDB/FE, and design and execute rollback plans.
- Support process & collaboration: Solid incident, change and problem management capability, including strong case notes, clear RCAs and impact analysis; plus the ability to work across IMS, EPC/5GC, RAN and BSS/Charging teams and explain complex UDM/UDC findings clearly to customers during high-pressure incidents.
- 5GC/CCRC domain: Understanding of the role of CCRC with NRF, NSSF, DNS and SBI/HTTP2 in 5G Core.
- Platform/cloud: Strong Linux skills, OpenStack basics, Kubernetes/containers and YAML-based configuration.
- NRF/DNS/NSSF behaviour: Knowledge of geo-redundancy, database sync/resync and system expansion/reduction.
- Operations & troubleshooting: Experience with install, upgrade and expansion activities; reading Kubernetes and NF logs; and debugging registration and slice-selection issues.