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Donatella Ermini 


Traffic Scheduling in WiMAX Systems 

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WiMAX (Worldwide Interoperability for Microwave Access) technology is presently one of the most promising ones for global telecommunication systems. Great hopes and important investments have been made for WiMAX, which is a Broad-band Wireless Access (BWA) System having many applications: fixed or last mile wireless access, backhauling, mobile cellular network, telemetering, etc. WiMAX technology is designed for the transmission of multimedia services (voice, Internet, real-time video, email, games and others) at high data rates (of the order of Mb/s per user) on large distances (of the order of tens of kilometers). WiMAX is based on the IEEE 802.16 Standard, which only defines the two lowest layers of the ISO/OSI model: the Medium Access Control Layer (MAC) and the Physical Layer (PHY). The standard defines a mechanism of Quality of Service (QoS) at MAC layer but does not specify any scheduling algorithm that must be used to allocate users traffic on uplink channel. Providing QoS guarantee to applications with different requirements is a very challenging issue. It is important commitment for a scheduling algorithm to gain multiple goals, such as satisfying QoS requirements of the users (e.g. delay, jitter, bandwidth, packet loss, etc), maximizing system utilization (throughput) and ensuring fairness among the users. My research activity focuses on Uplink Scheduling Algorithms for QoS support at the Base Station in IEEE 802.16e-2005/Mobile WiMAX networks. This presentation introduces my current investigation and result on a scheduling problem in systems adopting OFDMA transmission technique at PHY layer, like 802.16e-2005/Mobile WiMAX.


OFDMA Wireless Systems, Traffic Scheduling, Complexity 


Maurizio Bonuccelli 




Created at 8/7/2009 12:11 AM  by  
Last modified at 8/31/2009 12:35 PM  by Cristian Dittamo