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LTE Test & Deployment Engineer (8941527)
Menlo Park, CA
IT/Engineering and Mobile
Configuration and testing of cellular systems (2G GSM, 3G UMTS, 4G LTE) in a lab and field trial environment, with focus on cellular core network elements (MSC, IMS, MME, SGW/PGW, OCS, PCRF, etc.)
Integrating, testing and troubleshooting various 3GPP core interfaces such as S1, S11, S5, S8, SGi, Gx/Gy, S6a, etc.
Testing and validation of features such as LTE mobility management, handoffs, roaming architecture, CSFB, VoLTE, etc.
Configuration and integration of RAN radio equipment and backhaul technologies such as microwave/satellite with EPC core network
Install, maintain and operate various test tools & equipment (hardware and software) used during lab trial and field trials
Development of interoperability test plans with focus on core network elements, but also including site shakedown, site verification and field trial test plans
Execution of test plans ensuring requirements are met, automation of test cxases, documentation of test procedures, reporting and analysis of issues, bug fix verification
Creating various documents for system integrators, engineering and network operators (eg., training, installation, troubleshooting)
Engaging with various internal teams and external teams such as OEMs and Operators during lab trials and field trials
International travel in support of field trials
Working knowledge of 3GPP specifications, specifically 2G GSM, 3G UMTS, 4G LTE
Experience configuring, testing and integrating UE, eNB, SGW, MME, PGW, EPC, PCRF, OCS, IMS
Experience with end-to-end LTE call flow procedures, RRC connection setup, attach/detach procedures, S1 link establishment, CQI/RI, S5/S11 interfaces, Gx/Gy interfaces, radio link failures
Working knowledge of EMS, NMS systems, fault management & performance monitoring & configuration management
Strong knowledge of RAN KPIs, backhaul KPIs and core KPIs
Experience with configuration and troubleshooting voice related services such as CSFB, SRVCC, VoLTE
Strong knowledge in linux/networking configuration (DHCP, DNS, IPv4/IPv6, VLAN, virtual interfaces, MTU)
Experience with test plan execution, troubleshooting and documenting issues, setting up test beds, configuring test equipment, RF chambers and troubleshooting end-to-end 2G/4G systems
Experience with traffic generators (eg., TM500, UE100, UDP/TCP iperf, speedtest), UE load testing, spectrum analyzers, protocol analyzers (eg., wireshark)
Experience with drive tests equipment such as QualiPOC, Nemo, TEMS
Strong experience in automating test cases, API integration, python scripting
Troubleshooting and replication of issues seen in lab trials and field trials. Collect and analyze network and device logs and work with vendors and operators to close on issues
Desired experience with cloud-based controllers and orchestrators
Desired understanding of Carrier WiFi Offload, LTE-U and Private LTE
Bachelor's degree in engineering or related discipline
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