Although WiMAX, LTE, and WiFi provide wireless broadband connectivity, they have been optimized for different usage models: WiFi for very high-speed local area network connectivity and WiMAX, LTE for high-speed wireless cellular connectivity. By combining WiMAX, LTE, and WiFi technologies, service providers can offer better usability of the networks infrastructure and support for seamless mobility and roaming. The unique similarities between WiMAX, LTE, and WiFi networks that make the proposed synergy promising is these technologies are fully packet switching uses IP-based technologies to provide connection services to the Internet. This standards- and IP-based network approach provides compelling benefits to service providers to collaborate between these technologies.

This special issue is intended to foster state-of-the-art research in the area of WiMAX, WiBro, LTE, and WiFi networking, and the corresponding technical advances in the design and deployment of feasible network architectures and protocols, and to present novel results and solutions to solve various problems and challenges foreseen in WiMAX, LTE, and WiFi interworking. The special issue will cover the following topical areas but are not limited to them:

• WiMAX, WiBro, MobileFi, LTE, and WiFi communications systems
• Single/dual radio handover
• Network architecture alternatives for interworking and integration
• Heterogeneous wireless networks
• Seamless vertical handover and session continuity
• Multiradio coexistence and power management
• Authentication, authorization, and accounting
• Security issues
• Common charging and billing
• Quality of services (QoS)
• Interworking using IMS, SIP, MIH, VCC, and UMA
• IEEE802.11u, IEEE802.16g/j/m/h
• Scenarios and usage cases
• WiMAX,WiBro, LTE, and WiFi Interworking Testbed
• Hybrid wireless mesh network
• Applications, VOIP, video streaming, and so forth
• IP Mobile, roaming, and mobility management
• Core network architecture
• Fixed-mobile convergence (FMC)
• PHY, MAC, IP, and upper layers issues

Before submission authors should carefully read over the journal's Author Guidelines, which are located at http://www.hindawi.com/journals/jcsnc/guidelines/. Prospective authors should submit an electronic copy of their complete manuscript through the journal Manuscript Tracking System at http://mts.hindawi.com/, according to the following timetable: