Pub Date : 2013-10-01DOI: 10.1109/NOF.2013.6724508
Jae-Pil Jeong, Young Deok Park, Young-Joo Suh
Recently more and more mobile smart devices such as smartphones and smart pads are used, which accelerates wide deployments of IEEE 802.11 based access points (APs) to provide wireless coverage. In IEEE 802.11 networks, a handoff occurs when a mobile station moves from one basic service set (BSS) to another BSS. During the handoff process, long delay may occur, which severely degrades user satisfaction for services that require stringent QoS requirements, such as VoIP and video streaming. In this paper, we propose a handoff scheme to reduce handoff delay under the enterprise wireless local area network (EWLAN) environment. In EWLAN, a special entity called central controller collects wireless channel information and controls system parameters of APs to enhance network performance. In the proposed scheme, each AP is equipped with multiple wireless network interface cards to reduce handoff delay. We performed simulations to evaluate performance, and our simulation results show that the proposed scheme shows lower handoff delay performance than existing handoff schemes.
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Pub Date : 1900-01-01DOI: 10.1109/NOF.2013.6724514
Gyuyeong Kim, Wonjun Lee
Cloud data centers provide cost-effective and elastic resource management environments through multi-tenancy. However, we observe that existing policies cause unfair bandwidth allocation. A max-min based policy allocates lower bandwidth to a tenant whose the size of flows is mostly large, and DCTCP falls short of high utilization and minimum performance guarantee. Moreover, commodity clouds are vulnerable to denial of service (DoS) attacks, which can be attempted by a malicious tenant. The aforementioned deficiencies decrease the motivation to use clouds and revenue of cloud providers. To address the problem, we propose Spiderweb, a fair network sharing mechanism for cloud data centers, which allocates bandwidth to tenants in proportion to the amount of demand and payment during oversubscription. Our proposal delivers both a cloud-specialized fair network sharing environment and robustness against DoS attacks. We show that our proposal meets the desirable sharing properties including proportional fairness, performance isolation, and high utilization through analytical allocation scenarios.
{"title":"Cannot take my allocation: Enforcing fairness by considering demand and payment in clouds","authors":"Gyuyeong Kim, Wonjun Lee","doi":"10.1109/NOF.2013.6724514","DOIUrl":"https://doi.org/10.1109/NOF.2013.6724514","url":null,"abstract":"Cloud data centers provide cost-effective and elastic resource management environments through multi-tenancy. However, we observe that existing policies cause unfair bandwidth allocation. A max-min based policy allocates lower bandwidth to a tenant whose the size of flows is mostly large, and DCTCP falls short of high utilization and minimum performance guarantee. Moreover, commodity clouds are vulnerable to denial of service (DoS) attacks, which can be attempted by a malicious tenant. The aforementioned deficiencies decrease the motivation to use clouds and revenue of cloud providers. To address the problem, we propose Spiderweb, a fair network sharing mechanism for cloud data centers, which allocates bandwidth to tenants in proportion to the amount of demand and payment during oversubscription. Our proposal delivers both a cloud-specialized fair network sharing environment and robustness against DoS attacks. We show that our proposal meets the desirable sharing properties including proportional fairness, performance isolation, and high utilization through analytical allocation scenarios.","PeriodicalId":143986,"journal":{"name":"2013 Fourth International Conference on the Network of the Future (NoF)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122631867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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