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IEEE 802.16j mobile relay station (MRS) is used to extend the coverage area of WiMAX. The MRS provides a fixed access link to mobile terminals riding on a vehicle. When a mobile station (MS) moving together with MRS changes its associated base station (BS), it performs network layer handover while MRS performs link layer handover. It usually causes a long service disruption time (SDT) that seriously...
The WiMAX features longer transmission distance and more accomplished support of QoS than other wireless access technologies such as 802.11. Since the standard did not specify the QoS based packet-scheduling algorithms which run on the base stations, those algorithms are open for alternative implementations. In this paper, we propose a scheduling algorithm for burst traffic in the WiMAX base station...
Internet Protocol Television (IPTV) is an emerging and killer application for WiMAX networks, which takes advantage of multicasting mechanisms to efficiently deliver the video data to groups of subscribers. In this paper, we propose a Reception-rate-tracking Opportunistic Multicast Scheduling (ROMS) to enhance the performance of scalable IPTV layered multicasting over WiMAX networks. The proposed...
Opportunistic multicast scheduling (OMS) requires the subscribers to feed back their instantaneous channel conditions frequently, and the feedback load increases linearly as the number of subscribers in the system increases. In this letter, we propose a Weakly Consistent OMS scheme for feedback reduction. The contribution of the proposed scheme is twofold: 1) feedback load is reduced while the multicast...
The IEEE 802.16 standard was designed to provide rapid deployment, high bandwidth, and low-cost fixed broadband wireless access (BWA). As an enhancement, IEEE 802.16e standard was developed for further supporting mobility. As media streaming services are extending to mobile stations, it is crucial to minimize the handover delay and service disruption time so as to maintain the sustained connection...
IEEE 802.16, also called WiMAX was developed to accommodate large coverage and high bandwidth last-mile Internet access. In WiMAX, provisioning of QoS is still an important issue. Before transmitting packets, subscriber stations (SS) must send a bandwidth request message to the base station (BS). If available bandwidth is not sufficient to use unicast polling for each SS to send bandwidth request,...
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