noun
communications engineering
Academic and professional field covering the design and operation of telecommunications systems.
彼は大学で通信工学を専攻している。
He is majoring in communications engineering at university.
情報工学 (information engineering) focuses on computer and data systems, while 通信工学 deals specifically with transmission and networking.
Compound of 通信 (つうしん, 'communication') and 工学 (こうがく, 'engineering').