Author :
Yang, Kun ; Zhang, Jie ; Chen, Hsiao-Hwa
Abstract :
The integration of different types of wireless access networks, or heterogeneous wireless networks (HWN), is emerging. This article investigates in particular how a combination of UMTS (Universal Mobile Telecommunications System) cellular networks, wireless LAN ad hoc networks, and DVB-H (digital video broadcasting - handheld) broadcasting networks, called UWD networks for short, is constructed and managed to provide users with QoS-aware services. Given the complexity of the UWD networks, a novel policy-based service gateway is proposed. As a software framework sitting over and communicating with the UWD network, this UWD service gateway makes network management decision by reasoning over a set of predefined policies that describe the behaviors of the UWD network. Network variables such as bandwidth, delay, and mobility in policies are fuzzified using fuzzy control theory to make the service gateway (as well as the whole UWD network) more flexible and robust. Both the prototype implementation and the evaluation results indicate the feasibility and effectiveness of the system
Keywords :
3G mobile communication; ad hoc networks; cellular radio; digital video broadcasting; fuzzy control; internetworking; mobility management (mobile radio); quality of service; radio access networks; stability; telecommunication control; wireless LAN; DVB-H broadcasting networks; UMTS cellular networks; UWD networks; Universal Mobile Telecommunications System; bandwidth; delay; digital video broadcasting - handheld; flexible QoS-aware service gateway; fuzzy control theory; heterogeneous wireless networks; local area networks; mobility; network management decision; quality of service; robust gateway; wireless LAN ad hoc networks; wireless access networks; 3G mobile communication; Ad hoc networks; Bandwidth; Digital video broadcasting; Fuzzy control; Land mobile radio cellular systems; Robust control; Telecommunication network management; Wireless LAN; Wireless networks;
