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dc.contributor.authorChen, Jen-Jeeen_US
dc.contributor.authorLee, Lingen_US
dc.contributor.authorTseng, Yu-Cheeen_US
dc.date.accessioned2014-12-08T15:33:16Z-
dc.date.available2014-12-08T15:33:16Z-
dc.date.issued2011-06-01en_US
dc.identifier.issn1389-1286en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.comnet.2011.01.005en_US
dc.identifier.urihttp://hdl.handle.net/11536/23157-
dc.description.abstractWith the increasing popularity of WLANs and the growing demand for VoIP services, there is a need to guarantee QoS for VoIP calls while support as many calls as possible. Prior efforts focus on call admission control (CAC), but did not address the important handoff and physical rate adaptation issues caused by mobility and wireless channel variation. Assuming that VoIP calls can be supported by multi-grade QoS levels and that handoff and rate adaptation are possible, we show how to conduct CAC and resource management by integrating SIP and the QoS mechanisms of IEEE 802.11e together. When wireless resource is stringent, our resource management can dynamically adjust the resource distribution among existing calls by controlling their supporting codecs and packetization intervals. This not only takes care of calls in bad channel conditions, but also can accept more calls. Thus multi-grade QoS is achieved with decreased blocking rate for new calls and less dropping rate for handoff calls. In addition, we also show how to achieve early resumption of resources for handoff calls. Both analytical and simulation results are presented to evaluate the performance of the proposed schemes. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.en_US
dc.language.isoen_USen_US
dc.subjectIEEE 802.11een_US
dc.subjectQuality of Service (QoS)en_US
dc.subjectCall admission control (CAC)en_US
dc.subjectVoice-over-IP (VoIP)en_US
dc.subjectRate adaptationen_US
dc.subjectHandoffen_US
dc.subjectWireless networken_US
dc.subjectSession Initiation Protocol (SIP)en_US
dc.titleIntegrating SIP and IEEE 802.11e to support handoff and multi-grade QoS for VoIP-over-WLAN applicationsen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.comnet.2011.01.005en_US
dc.identifier.journalCOMPUTER NETWORKSen_US
dc.citation.volume55en_US
dc.citation.issue8en_US
dc.citation.spage1719en_US
dc.citation.epage1734en_US
dc.contributor.department資訊工程學系zh_TW
dc.contributor.departmentDepartment of Computer Scienceen_US
dc.identifier.wosnumberWOS:000291175500008-
dc.citation.woscount1-
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