Mobile communication systems Wireless communication systems 25 IEEE 802.16 (Standard) 5 Roaming (Telecommunication) 5 Wireless LANs 5 Broadband communication systems 3 Equipment and supplies 3 Wireless metropolitan area networks 3 Management 2 Absorption 1 Access control 1 Ad hoc networks (Computer networks) 1 Adaptive antennas 1 Antennas (Electronics) 1 Cell phone systems 1 Cell phones 1 Cellular telephone systems 1 Code division multiple access 1 Communication systems 1 Design and construction 1 Energy harvesting 1 Enterprise application integration (Computer systems) 1 Global system for mobile communications 1 Instant messaging 1 Mathematical models 1 Microstrip antennas 1 Mobile computing 1 Multimedia communications 1 Power resources 1 Printed circuits 1