Studi Implementasi Manajemen Antrian WRED Untuk Menghindari Congestion Pada LR‐WPAN

Low Rate Wireless Personal Area Network (LR‐WPAN) merupakan standar protokol komunikasi yang dikembangkan grup IEEE 802.15.4, fokus pengembangannya adalah menciptakan arsitektur jaringan yang menggunakan daya rendah, memiliki jangkauan luas, dan transmisi data yang reliable. Salah satu produk dari LR‐WPAN adalah Zigbee. Fokus Zigbee pada pengiriman data yang reliable dapat terganggu bila terjadi congestion yang disebabkan padatnya aliran data di jaringan. Congestion tersebut dapat dihindari dengan menerapkan manajemen antrian yang tepat. Salah satu jenis manajemen antrian tersebut adalah weighed random early detection (WRED), kelebihan dari manajemen antrian WRED adalah mekanismenya tidak hanya fokus menghindaricongestion tapi juga mengakomodasi jenis paket yang perlu diprioritaskan pelayanannya. Implementasi manajemen antrian WRED pada Zigbee dilakukan guna mengukur kinerja arsitektur dalam mencegahcongestion yang pada penelitian ini disimulasikan menggunakan simulator Riverbed Modeler. Kinerja manajemen antrian dalam mencegahcongestion dianalisis menggunakan parameter global MAC delay, coordinator queue delay, coordinator throughput dan coordinator packet drop. Pengujian kinerja manajemen antrian dilakukan dengan membandingkan WRED terhadap manajemen antrian random early detection (RED), dimana kedua manajemen antrian menggunakan mekanisme min thresh dan max thresh untuk menghindaricongestion namun memiliki mekanisme seleksi yang berbeda. Dari hasil pengujian didapatkan dengan ukuran paket kecil dan max thresh kecil penggunaan WRED akan lebih optimal ditunjukkan dengan nilai parameter throughput yang lebih optimal 1.5%, sedangkan pada ukuran paket yang besar dan max thresh yang besar penggunaan RED akan lebih optimal ditunjukkan dengan nilai parameter throughput yang lebih optimal 0.6% dari WRED

Enhancing performance of conventional computer networks employing selected SDN principles

This thesis was submitted for the award of Doctor of Philosophy and was awarded by Brunel University LondonThis research is related to computer networks. In this thesis, three main issues are addressed which affect the performance of any computer network: congestion, efficient resources utilization and link failure. Those issues are related to each other in many situations. Many approaches have been suggested to deal with those issues as well as many solutions were applied. Despite all the improvements of the technology and the proposed solutions, those issues continue to be a burden on the system’s performance. This effect is related to the increase of the Quality of Service (QoS) requirements in modern networks. The basic idea of this research is evolving the intelligence of a conventional computer network when dealing with those issues by adding some features of the Software Defined Networking (SDN). This adoption upgrades the conventional computer network system to be more dynamic and higher self-organizing when dealing with those issues. This idea is applied on a system represented by a computer network that uses the Open Shortest Path First (OSPF) routing protocol. The first improvement deals with the distribution of Internet Protocol (IP) routed flows. The second improvement deals with tunnel establishment that serves Multi-Protocol Label Switching (MPLS) routed flows and the third improvement deals with bandwidth reservation when applying network restoration represented by Fast Re-route (FRR) mechanism to sooth the effect of link failure in OSPF/MPLS routed network. This idea is also applied on another system that uses the Enhanced Interior Gateway Routing Protocol (EIGRP) to improve the performance of its routing algorithm. Adopting the SDN notion is achieved by adding an intelligent controller to the system and creating a dialog of messages between the controller and the conventional routers. This requires upgrading the routers to respond to the new modified system.Our proposed approaches are presented with simulations of different configurations which produce fine results