Mobile communication systems Wireless communication systems 34 Radio 11 Mobile computing 10 Design and construction 8 Fading 8 Transmitters and transmission 8 Security measures 7 Digital communications 6 Long-Term Evolution (Telecommunications) 6 Technological innovations 6 Cell phone systems 5 Code division multiple access 5 Computer networks 5 IEEE 802.16 (Standard) 5 Instant messaging 5 Roaming (Telecommunication) 5 Telecommunication 5 Wireless LANs 5 Antennas (Electronics) 4 Cell phones 4 Equipment and supplies 4 Packet switching (Data transmission) 4 Access control 3 Broadband communication systems 3 Cellular telephone services industry 3 Design 3 Management 3 Multimedia systems 3 Orthogonal frequency division multiplexing 3