Telecom Industry Interview Q&A
Q: What is OSS vs BSS?
OSS (Operations Support System): manage network — fault management, performance, configuration, inventory. BSS (Business Support System): manage business — billing, customer management, order management, product catalog.
Q: What is the difference between 4G LTE and 5G?
4G: OFDMA air interface, EPC core, peak 100Mbps, ~10ms latency. 5G: OFDM + mmWave, 5GC service-based architecture, peak 20Gbps, <1ms URLLC latency, network slicing, massive MIMO.
Q: What is RAN?
Radio Access Network: the part of mobile network between device and core. Consists of: antennas, base stations (eNodeB for 4G, gNodeB for 5G). RAN connects UE to EPC/5GC via air interface.
Additional Reference
This topic has detailed content in adjacent sections. Check Overview for architecture, Fundamentals for core concepts, and Cheatsheets for quick command reference. Cross-reference with related topics in the same academy for complete understanding.