Title :
A QoS Oriented Vertical Handoff Scheme for WiMAX/WLAN Overlay Networks
Author :
Ma, Dong ; Ma, Maode
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore
fDate :
4/1/2012 12:00:00 AM
Abstract :
Recently, a number of wireless communication technologies are migrating toward heterogeneous overlay networks. The integration of Mobile WiMAX and WLAN seems to be a promising approach due to their homogeneous nature and complementary characteristics. In this paper, we investigate several important issues for the interworking of Mobile WiMAX and WLAN networks. We address a tightly coupled interworking architecture. Further, a seamless and proactive vertical handoff scheme is designed based on the architecture with aims to provide always the best quality of service (QoS) for users. Both the performance of applications and network conditions are considered in the handoff process. Moreover, we derive evaluation algorithms to estimate the conditions of both WiMAX and WLAN networks in terms of available bandwidth and packet delay. A simulation study has demonstrated that the proposed schemes can keep stations always being best connected.
Keywords :
4G mobile communication; WiMax; mobile radio; mobility management (mobile radio); quality of service; wireless LAN; QoS oriented vertical handoff scheme; WiMAX-WLAN overlay networks; fourth-generation wireless networks; heterogeneous overlay networks; mobile WLAN; mobile WiMAX; packet delay; quality of service; wireless communication technologies; Bandwidth; Delay; IP networks; Mobile communication; Quality of service; WiMAX; Wireless LAN; WLAN; WiMAX; available bandwidth; packet delay.; tightly coupled; vertical handoff;
Journal_Title :
Parallel and Distributed Systems, IEEE Transactions on
DOI :
10.1109/TPDS.2011.216