Abstract
In this project, we proposed a framework to support heterogenous traffic with different QoS demand in WiMAX. This framework dynamically changes the bandwidth allocation (BA) for ongoing and new arrival connections based on network condition andservice demand. The objective is to efficiently use the available bandwidth and provide QoS support in a fair manner. Dynamic allocation of spectrum prior to transmission can mitigate the starvation problem of Non Real time application. The WFQ based dynam ic bandwidth allocation framework uses architecture that has packet scheduler scheme (PS), call admission policy and a dynamic bandwidth allocation mechanism. By the simulation result we have showed that this architecture could provide QoS support by bei ng fair to all classes of services.
Highlights
Worldwide Interoperability for Microwave Access(WiMAX) will play an important role in the fixed broadband wireless access since it is more cost effective and faster to set up technology which is based on IEEE 802.16 standard that specifies the new air interface for microwave access,which was designed for wireless metropolitan area networks
WiMAX provides an affordable alternative for wireless broadband access supporting a variety of applications of different types including video conferencing, non-real-time large volume data transfer, traditional voice/data traffic throughput connection, and web browsing.In order to have the best controlled bandwidth allocation of the WiMAX network, IEEE 802.16e-2005 standard defines 5 types of service flow as following: Unsolicited grant service (UGS) (Unsolicited Grant Service), Real Time Polling Service (rtPS)(Real-Time Polling Service), ertPS (Extended Real-Time Polling Services), Non Real Time Polling Service (nrtPS) (Non-Real Time PollingService) and BE (Best Effort)
International Journal of Computational Science and Information Technology (IJCSITY) Vol.2, No.2, May 2014 2. This result shows that intra class scheduling is done among all the five types of service classes by comparing the corresponding the utilisation and fairness of each packets .Fig 4 shows that UGS packets are ordered within the UGS class itself i.e.intraclass scheduling
Summary
Worldwide Interoperability for Microwave Access(WiMAX) will play an important role in the fixed broadband wireless access since it is more cost effective and faster to set up technology which is based on IEEE 802.16 standard that specifies the new air interface for microwave access,which was designed for wireless metropolitan area networks. WiMAX provides an affordable alternative for wireless broadband access supporting a variety of applications of different types including video conferencing, non-real-time large volume data transfer, traditional voice/data traffic throughput connection, and web browsing.In order to have the best controlled bandwidth allocation of the WiMAX network, IEEE 802.16e-2005 standard defines 5 types of service flow as following: UGS (Unsolicited Grant Service), rtPS(Real-Time Polling Service), ertPS (Extended Real-Time Polling Services), nrtPS (Non-Real Time PollingService) and BE (Best Effort). Each traffic flows requires different QoS to meet different QoS requirements of different traffic flows , an efficient queuing scheme is necessary due to the instability of wireless transmission environment traffic scheduling is used to ensure that QoS requirements are met. Scheduling schemes are used to resolve conflict for shred resource in a network by allocating bandwidth to each requested users and determine the transmission priority.Each flow requires a certain minimum bandwidth to achieve its QoS. We propose a dynamic bandwidth allocation mechanism to achieve fair and efficient allocation
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