Packet Switching Core Engineer

Job Summary

We are seeking a PS (Packet Switched) Core Network Engineer to operate, maintain, and optimize PS core networks across 2G, 3G, 4G, and 5G environments. The role covers daily operations, advanced troubleshooting, solution implementation, and network evolution activities, with responsibilities aligned to the engineers experience level.

Experience Levels

• Engineer: 3 Years
• Senior Engineer: 5–8 Years

Responsibilities & Technical Requirements:

Advanced Troubleshooting & Maintenance

• Strong capability in comprehensive troubleshooting and routine PS core maintenance
• Solid understanding of IPv4 networking and subnetting
• Expertise in trace capture and analysis tools:
• PCAP, Traceview
• Proficient with FMA for traffic statistics, alarms, operation logs, and CHR analysis

Mobility, Interfaces & Services

• Strong command of mobility and session management:
• Attach, TAU, Handover, PDP setup, session setup
• Registration, inter-RAT interworking
• User authentication, NE selection, QoS principles
• Knowledge of interface signaling tracing and analysis:
• Ga, Gn, Iu, Gr, Gb, S1-MME, S1-U, S5, S8, SGi, Gx, Gy

PS Core Implementation

• Hands-on experience with 2G / 3G / 4G PS service implementations:
• SGSN/MME pooling
• Address pool allocation
• CSFB
• Experience with simple PCC services and charging schemes

O&M & KPIs

• Strong routine O&M capabilities:
• Message tracing, alarm analysis, performance monitoring
• Experience with patching, upgrades, part replacement, and capacity expansion
• Knowledge of NSA and SA architectures and 5G solutions
• Ability to analyze 3G / 4G / 5G KPIs and counters and troubleshoot KPI degradation
• Experience with licenses, patches, certificates, and KPI systems