System Engineers for Telecom (L1 and L2)
Workplace: Kista, Sverige
Expires: September 30, 2025
Seeking system-focused engineers to engage in early-phase studies and simulation work for 5G NR feature evolution. The role involves system design, feature development, and verification with emphasis on simulation-driven analysis aligned with 3GPP architecture, supporting Layer 1 (PHY) and Layer 2 (MAC/RLC/PDCP).
Main requirements:
- Solid understanding of 5G NR protocol stack based on 3GPP
- Familiarity with simulation environments and analytical tools
- Ability to work independently, document, and communicate effectively
- Willingness and ability to learn Ericsson-specific platforms
Responsibilities:
- Lead and support technical studies in feature pre-development
- Execute simulation-based evaluations (link-level, scheduler behaviour, accelerator feasibility)
- Provide architectural input and early design feedback
- Align work with 3GPP standards and Ericsson internal architectures (e.g., MSRBS, GPP)
- Collaborate cross-functionally with system, software, and verification teams
Required hard skills:
- Deep understanding of MAC scheduling and multiplexing (for L2 candidates)
- Logical-to-transport channel mapping
- Buffer Status Reports (BSR) and Scheduling Requests (SR)
- RLC modes: TM, UM, AM
- Knowledge of User Plane Control (UPC) and Radio Resource Management (RRM)
- Link-level simulations (e.g., Falcon) for L1 candidates
- 5G PHY protocol stack including UL/DL procedures, HARQ, beamforming
- Waveforms and signal design (OFDM, SC-FDMA)
- Channel coding (LDPC, Polar)
- Synchronization signals (PSS/SSS, DMRS, CSI-RS)
- Slot/frame structure understanding (3GPP TS 38.211/213)
Recommended hard skills:
- PDCP knowledge including ciphering and header compression (L2)
- Experience with simulation or log analysis tools
- Python, Matlab, or C++ scripting for automation or modeling
- Experience integrating simulations with HW testbeds (L1)
- Understanding of FAPI/nFAPI or O-RAN PHY interface specifications
Soft skills:
- Ability to work independently
- Effective documentation and communication skills
- Willingness to learn new platforms and technologies
Coding languages:
- Python
- Matlab
- C++
Natural languages:
- English (Proficient)
Cultural skills:
- Cross-functional collaboration
- Mentorship and onboarding participation
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