LTE Systems Engineer

Overview

6-month contract - Inside IR35 - Rate TBC. Clearance:
Must hold or be eligible for SC security clearance.

You will lead the design and integration of the Mobile Core and Radio Access Network (RAN). You will be the subject matter expert for the LTE and TETRA software stacks, ensuring they are correctly containerised or virtualised within our deployable units. You are responsible for ensuring that someone with a smartphone/LTE Modem or a TETRA radio can communicate seamlessly over the same integrated system.

• Core & RAN System Design
  • Standardised Architecture:
    Design the deployable LTE EPC (Evolved Packet Core).
  • RAN Engineering:
    Define the configuration for LTE eNodeBs and TETRA Base Stations.
  • Spectrum Management:
    Develop frequency plans that avoid interference between the LTE and TETRA bands.
• Service Integration & Interoperability
  • Cross-Platform Voice:
    Architect and implement Push-to-Talk over Cellular (PToC) and MCX (Mission Critical Services).
  • Subscriber Management:
    Manage the HSS (Home Subscriber Server) and TETRA databases.
  • Synchronisation:
    Lead the implementation of high-precision timing required for Precision Time Protocol.
  • Geographical Redundancy:
    Architect and implement Geographical Redundancy.
• Documentation & Build Leadership
  • Configuration Standards:
    Create the "Gold Master" settings for the LTE and TETRA cores.
  • The "Build Book":
    Author step-by-step instructions for software installation, licensing, and RF tuning.
  • Lab Leadership:
    Own the "Communications Lab" where the Test System is housed.
• Troubleshooting & Performance Tuning
  • Protocol Analysis:
    Use tools like Wireshark and S1AP/NAS tracers to diagnose complex failures.
  • RF Optimisation:
    Analyse drive-test data to tune handover thresholds and power levels.
• Technical Proficiency Profile
  • 3
    
    GPP Mastery:
    Deep knowledge of MME, SGW, PGW, and HSS functions.
  • TETRA Expertise:
    Strong understanding of ETSI TETRA standards, Air Interface Encryption (AIE), and End-to-End Encryption (E2EE).
  • Virtualisation:
    Proficiency in VMware, KVM, or Docker/Kubernetes.
  • Signaling:
    Expert level understanding of S1-MME, S1-U, and TETRA ISI (Inter-System Interface).