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Article: Solutions to performance problems in VoIP over a 802.11 wireless LAN

TitleSolutions to performance problems in VoIP over a 802.11 wireless LAN
Authors
KeywordsCapacity
IEEE 802.11
Quality of service (QoS)
Voice over internet protocol (VoIP)
Wireless local area network (WLAN)
Issue Date2005
PublisherI E E E. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=25
Citation
Ieee Transactions On Vehicular Technology, 2005, v. 54 n. 1, p. 366-384 How to Cite?
AbstractVoice over Internet Protocol (VoIP) over a wireless local area network (WLAN) is poised to become an important Internet application. However, two major technical problems that stand in the way are: 1) low VoIP capacity in WLAN and 2) unacceptable VoIP performance in the presence of coexisting traffic from other applications. With each VoIP stream typically requiring less than 10 kb/s, an 802.11b WLAN operated at 11 Mb/ s could in principle support more than 500 VoIP sessions. In actuality, no more than a few sessions can be supported due to various protocol overheads (for GSM 6.10, it is about 12). This paper proposes and investigates a scheme that can improve the VoIP capacity by close to 100% without changing the standard 802.11 CSMA/CA protocol. In addition, we show that VoIP delay and loss performance in WLAN can be compromised severely in the presence of coexisting transmission-control protocol (TCP) traffic, even when the number of VoIP sessions is limited to half its potential capacity. A touted advantage of VoIP over traditional telephony is that it enables the creation of novel applications that integrate voice with data. The inability of VoIP and TCP traffic to coexist harmoniously over the WLAN poses a severe challenge to this vision. Fortunately, the problem can be largely solved by simple solutions that require only changes to the medium-access control (MAC) protocol at the access point. Specifically, in our proposed solutions, the MAC protocol at the wireless end stations does not need to be modified, making the solutions more readily deployable over the existing network infrastructure. © 2005 IEEE.
Persistent Identifierhttp://hdl.handle.net/10722/42708
ISSN
2015 Impact Factor: 2.243
2015 SCImago Journal Rankings: 1.203
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWang, Wen_HK
dc.contributor.authorLiew, SCen_HK
dc.contributor.authorLi, VOKen_HK
dc.date.accessioned2007-03-23T04:30:35Z-
dc.date.available2007-03-23T04:30:35Z-
dc.date.issued2005en_HK
dc.identifier.citationIeee Transactions On Vehicular Technology, 2005, v. 54 n. 1, p. 366-384en_HK
dc.identifier.issn0018-9545en_HK
dc.identifier.urihttp://hdl.handle.net/10722/42708-
dc.description.abstractVoice over Internet Protocol (VoIP) over a wireless local area network (WLAN) is poised to become an important Internet application. However, two major technical problems that stand in the way are: 1) low VoIP capacity in WLAN and 2) unacceptable VoIP performance in the presence of coexisting traffic from other applications. With each VoIP stream typically requiring less than 10 kb/s, an 802.11b WLAN operated at 11 Mb/ s could in principle support more than 500 VoIP sessions. In actuality, no more than a few sessions can be supported due to various protocol overheads (for GSM 6.10, it is about 12). This paper proposes and investigates a scheme that can improve the VoIP capacity by close to 100% without changing the standard 802.11 CSMA/CA protocol. In addition, we show that VoIP delay and loss performance in WLAN can be compromised severely in the presence of coexisting transmission-control protocol (TCP) traffic, even when the number of VoIP sessions is limited to half its potential capacity. A touted advantage of VoIP over traditional telephony is that it enables the creation of novel applications that integrate voice with data. The inability of VoIP and TCP traffic to coexist harmoniously over the WLAN poses a severe challenge to this vision. Fortunately, the problem can be largely solved by simple solutions that require only changes to the medium-access control (MAC) protocol at the access point. Specifically, in our proposed solutions, the MAC protocol at the wireless end stations does not need to be modified, making the solutions more readily deployable over the existing network infrastructure. © 2005 IEEE.en_HK
dc.format.extent853547 bytes-
dc.format.extent158720 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/msword-
dc.languageengen_HK
dc.publisherI E E E. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=25en_HK
dc.relation.ispartofIEEE Transactions on Vehicular Technologyen_HK
dc.rights©2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectCapacityen_HK
dc.subjectIEEE 802.11en_HK
dc.subjectQuality of service (QoS)en_HK
dc.subjectVoice over internet protocol (VoIP)en_HK
dc.subjectWireless local area network (WLAN)en_HK
dc.titleSolutions to performance problems in VoIP over a 802.11 wireless LANen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0018-9545&volume=54&issue=2&spage=366&epage=384&date=2005&atitle=Solutions+to+performance+problems+in+VoIP+over+a+802.11+wireless+LANen_HK
dc.identifier.emailLi, VOK:vli@eee.hku.hken_HK
dc.identifier.authorityLi, VOK=rp00150en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1109/TVT.2004.838890en_HK
dc.identifier.scopuseid_2-s2.0-13444280292en_HK
dc.identifier.hkuros105029-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-13444280292&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume54en_HK
dc.identifier.issue1en_HK
dc.identifier.spage366en_HK
dc.identifier.epage384en_HK
dc.identifier.isiWOS:000226482000032-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridWang, W=16425022700en_HK
dc.identifier.scopusauthoridLiew, SC=7102903257en_HK
dc.identifier.scopusauthoridLi, VOK=7202621685en_HK

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