tailieunhanh - Báo cáo hóa học: " Design of zone-based bandwidth management scheme in IEEE 802.16 multi-hop relay networks"

Design of zone-based bandwidth management scheme in IEEE multi-hop relay networks | Mai and Chen EURASIP Journal on Wireless Communications and Networking 2011 2011 15 EURASIP Journal on . http content 2011 1 15 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Design of zone-based bandwidth management scheme in IEEE multi-hop relay networks Yi-Ting Mai1 and Kuo-Yang Chen2 Abstract IEEE Wireless Network technology is a hot research issue in recent years. It provides wider coverage of radio and higher speed wireless access and Quality-of-Service plays an important part in the standard. For mobile multihop wireless network IEEE MR network not only can supply large area wireless deployment but also can provide high quality network service to mobile users. Although Mobile QoS supporting has been extensively investigated Mobile QoS supporting in the IEEE network is relatively unexplored. In this article the probability of a mobile user who visits a Relay Station RS is known beforehand. With the visiting probability at each RS and the system specified size of the range for bandwidth allocation Base Station BS can calculate the required bandwidth to meet the mobile user s demand and allocate appropriate bandwidth for a mobile user roaming in the range of the bandwidth allocation. The range of bandwidth allocation for mobile users is called the Zone in this article which includes the user s current RS and the nearby RSs. The proposed scheme is therefore called Zone-based bandwidth management scheme. The simulation results demonstrate that Zone-based bandwidth management scheme can reduce QoS degradation and bandwidth re-allocation overhead. Keywords WiMAX MR Mobility QoS Introduction With the popularity of wireless environments in recent years multimedia applications such as the IPTV and MOD are more and more attractive to the mobile host MH in the wireless networks like the IEEE 1 2 wireless LAN WLAN and the third generation 3G 3 4 HSDPA G 5 .