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Dissertations / Theses on the topic 'VoIP, WLAN'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Antham, Karunakar, Chandrashekar reddy Palle, and Ashwin kumar Mantoor. "Peer to Peer VoIP over IEEE 802.11 WLAN." Thesis, Högskolan i Halmstad, Halmstad Embedded and Intelligent Systems Research (EIS), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-19119.

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Voice over Internet Protocol (VoIP) over WLAN is one of the most important technologies in today’s world of communication. VoIP is simply a way to make phone calls through the internet because of the convergence of voice and data networks enables new applications and cost reductions. Voice over WLAN phones are already being offered to enterprises by leading vendors. Most of internet services or applications require centralized network to communicate, but with Ad-hoc networks there is no such requirement at all. In this report we have established a VoIP session by forming a network between Andr

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Magnusson, Maria. "LAN and WLAN planning, deployment, and evaluation." Thesis, KTH, Kommunikationssystem, CoS, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118346.

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Switch Nordic Green AB (Nordic Green Energy) is an energy company with about 40 employees. The customer service department is in-house and a lot of the work, by all departments, is done by programs running on remote servers. Today most of the network traffic is through a wired local area network, although there is a wireless guest network which is very unstable. While planning a move to a smaller office the company is planning to implement a more extensive wireless local area network. This bachelor thesis will provide a basis for implementing the local area network and wireless local area net

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Liu, Zuo. "Supporting VoIP in IEEE802.11 distributed WLANs." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/supporting-voip-in-ieee80211-distributed-wlans(1a6225c3-770e-4ce1-8fbb-b1e3f05534d2).html.

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Telecommunications is converging on the use of IP based networks. Due to the low cost of VoIP applications, they are being increasingly used instead of conventional telephony services. IEEE802.11 WLANs are already widely used both commercially and domestically. VoIP applications will also expand from usage over wired networks to voice communications over IEEE802.11 WLANs. This is known as VoWLAN. The use of VoWLAN may reach the maximum capacity of a wireless channel if there are many simultaneous VoIP calls operating close to each other. There is much published research based on a single IEEE8

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Yunda, Lozano Daniel. "Improving vertical handover performance for RTP streams containing voice : Using network parameters to predict future network conditions in order to make a vertical handover decision." Thesis, KTH, Kommunikationssystem, CoS, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92019.

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Wireless local area networks WLAN and Voice over IP technologies enable local low cost wireless telephony, while cellular networks offer wide-area coverage. The use of dual mode WLAN-cellular terminals should allow cost savings by automatically switching from GSM to WLAN networks whenever it is feasible. However, in order to allow user mobility during a call, a handover procedure for transferring a call between the WLAN interface and the cellular network should be defined. The decision algorithm that triggers such a handover is critical to maintain voice quality and uninterrupted communication

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Martinati, Rafael Rodrigo. "Frameworks de governan?a de TIC aplicados em SLA de VoIP sobre WLAN." Pontif?cia Universidade Cat?lica de Campinas, 2009. http://tede.bibliotecadigital.puc-campinas.edu.br:8080/jspui/handle/tede/502.

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Made available in DSpace on 2016-04-04T18:31:24Z (GMT). No. of bitstreams: 1 Rafael Rodrigo Martinati.pdf: 892328 bytes, checksum: bb06e7a9c52ea61c8c7545d477f6b0f3 (MD5) Previous issue date: 2009-06-19<br>The objective of this paper is to analyze the development of Service Level Agreement to Voice over Internet Protocol over WIFI services in compliance with COBIT, ITIL and ISO / IEC 20.000-1:20005 and ISO 38.500 frameworks, specially using perceived quality of speech as a SLA requirement . The models MOS, PESQ and E MODEL published by the ITU for evaluation of quality of speech analyzed wa

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Sfairopoulou, Anna. "A cross-layer mechanism for QoS improvements in VoIP over multi-rate WLAN networks." Doctoral thesis, Universitat Pompeu Fabra, 2008. http://hdl.handle.net/10803/7563.

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In IEEE 802.11 WLANs, Link Adaptation mechanisms, which choose the transmission rate of each node, provoke unexpected and random variations on the effective channel capacity. When these changes are towards lower bitrates, inelastic flows, such as VoIP, can suffer from sudden congestion, which results on higher packet delays and losses. In this thesis, a VoIP codec adaptation algorithm is proposed as a solution, based on a cross-layer feedback from RTCP packets and the MAC layer, which can adapt the codecs of active calls to adjust them to the multirate scenario. A combination of this algorithm

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Adigozalov, Niyaz. "The Intelligent Use of Multiple Interfaces." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for telematikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22689.

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Long-Term Evolution (LTE) is the latest development in wide area cellular mobile network technology. In contrast with the earlier generations of circuit-switched mobile networks, LTE is all-IP packet-switched network. Both voice and data are sent inside IP packets. Voice over IP (VoIP) is used to provide voice service to LTE users. The speech frames are encapsulated into real-time protocol (RTP) packets and sent over the network. The underlying UDP and IP layers prepend their headers to this small RTP packet resulting in a relatively high overhead. The small size of the RTP packets containing

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Derakhshanno, Homayoun. "Voice over IP over GPRS." Thesis, KTH, Kommunikationssystem, CoS, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91856.

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The Voice over IP (VoIP) technology has become prevalent today due to its lower cost than traditional telephony and its ability to support new value-added services. Additionally, the increasing availability of wireless internet access has led to research studies examining the combination of wireless network access with voice over IP. With the widespread availability of advanced mobile phones and Pocket PCs, the need for VoIP applications on these mobile platforms is tangible. To enable this, we need to evaluate the current wireless access technologies to see if they can support the necessary t

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Michalec, Richard. "Zvýšení efektivity handoveru v reálném síťovém prostředí." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-218988.

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The aim of this work is to study methods of handover used in WiMAX and WLAN networks, next suggest the posibility of simulation methods for WLAN handover in the simulation environment OPNET Modeler. This work is focused primarily on obtaining the information about neighboring AP and subsequent selection of a new AP using such information. The work describes in detail each processes solutions that are used to implement newscanning methods

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Nankani, Ajeet. "Horizontal Handoffs within WLANs : A detailed analysis and measurement concerning voice like traffic." Thesis, KTH, Mikroelektronik och Informationsteknik, IMIT, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92271.

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IEEE 802.11 based Wireless Local Area Networks (WLANs) in addition to being used as access networks for providing traditional data services, are now also being used as access networks for providing realtime services such as VoIP and multimedia streaming. These realtime services are sensitive to latency, hence requiring seamless or low delay service from the lower layers throughout an ongoing session. The IEEE 802.11 standard does not define any technique or algorithm to provide seamless connectivity during the process of handoff, hence it does not require 802.11 based WLANs to provide the same

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Bandeira, Alessandra Bussolin. "Distribui??o de weibull na emula??o de canal em redes WLAN para avalia??o de VoIP." Pontif?cia Universidade Cat?lica de Campinas, 2007. http://tede.bibliotecadigital.puc-campinas.edu.br:8080/jspui/handle/tede/490.

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Made available in DSpace on 2016-04-04T18:31:20Z (GMT). No. of bitstreams: 1 Alessandra B Bandeira.pdf: 1200038 bytes, checksum: 316684811248760f05faf3fdda1844f3 (MD5) Previous issue date: 2007-10-30<br>This work investigates VoIP (Voice over IP) performance over WLAN (WVoIP) through qualitative and quantitative point of view, considering degradation in indoor environment. The results was obtained through a channel emulator to produce the Weibull distribution. Measurements results with a robot showed that this distribution is adequate to represent WLAN environment instability. The test uti

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Novák, Přemek. "Optimalizace QoS a analýza závislostí komunikačních služeb na zpoždění." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-220410.

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This thesis consists of theoretical and practical parts. The theoretical part contains an analysis of the problems of wireless networkssolutions individual standards and methodologies to ensure quality of service. In the practical part using the OPNET Modeler, a number of different simulation models and their evaluation. It is a model of individual standards, support mobility and interference effects on quality of service.

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Donner, Sandra. "Theoretische und experimentelle Untersuchung des IEEE 802.11 (WLAN) Handover-Verfahren im Rahmen eines Voice-over-IP Projektes der Firma SIEMENS." [S.l. : s.n.], 2005. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11759032.

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Kaman, Štěpán. "Implementace kvality služby v bezdrátových sítích." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218097.

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Wireless networks are currently the frequent access connection to the local network or the Internet. Until 2005 there was no support in the 802.11 standard priority data and the use of multimedia services in these networks is problematic. Thesis deals with the standard IEEE 802.11 standard and quality of service support including IEEE 802.11e. They discussed methods of access to transmission medium, differences in the MAC sublayer, the reader issues in the transmission of priority data and the requirements for these data. In Opnet Modeler was created wireless network with access points and sta

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Marshall, Guilherme. "Estudo da influência das redes locais sem-fio IEEE 802.11g na qualidade de voz estimada pelo modelo e." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2006. http://hdl.handle.net/10183/11484.

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Este trabalho apresenta uma análise completa da qualidade de voz esperada em serviços de VoIP quando prestados sobre a plataforma WLAN IEEE 802.11g. Diferentemente da maior parte da literatura, este estudo complementa as informações de atraso, variação do atraso e taxa de perda dos pacotes, com um modelo analítico de avaliação de qualidade de voz proposto pela ITU-T, o Modelo E. Desta forma, todos os fatores modelados como perceptíveis pelos usuários do serviço telefônico são considerados simultaneamente, gerando, por fim, resultados correspondentes à escala de avaliação subjetiva da qualidade

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Oliveira, Claudio Xavier de. "Avaliação das tecnologias ClientMatch e dos padrões IEEE 802.11k e 802.11r no suporte a mobilidade e tráfego de tempo real em redes WLAN." reponame:Repositório Institucional da UnB, 2015. http://dx.doi.org/10.26512/2015.10.D.19389.

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Dissertação (mestrado)—Universidade de Brasília, Instituto de Ciências Exatas, Departamento de Ciência da Computação, Mestrado Profissional em Computação Aplicada, 2015.<br>Submitted by Albânia Cézar de Melo (albania@bce.unb.br) on 2016-01-28T11:53:24Z No. of bitstreams: 1 2015_ClaudioXavierOliveira.pdf: 6916242 bytes, checksum: 945503a644d7ced55dd003d0dad373a3 (MD5)<br>Approved for entry into archive by Raquel Viana(raquelviana@bce.unb.br) on 2016-01-28T18:44:42Z (GMT) No. of bitstreams: 1 2015_ClaudioXavierOliveira.pdf: 6916242 bytes, checksum: 945503a644d7ced55dd003d0dad373a3 (MD5)<br>Ma

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Bellalta, Boris. "Flow-level QoS guarantees in IEEE 802.11e EDCA-based WLANs." Doctoral thesis, Universitat Pompeu Fabra, 2007. http://hdl.handle.net/10803/7539.

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Les xarxes WLANs possibiliten un accés de banda ampla a Internet des <br/>d'un terminal mòbil, essent una possible solució alternativa a les <br/>xarxes cel·lulars. Tanmateix, aquest tipus de tecnologia presenta certes <br/>limitacions, com és la difícil coexistència entre fluxos de tràfic <br/>rígids (VoIP) i fluxos de tràfic elàstic (TCP), degut al propi protocol <br/>d'accés al medi. En aquesta tesi es proposa la utilització d'un nou <br/>mecanisme de control d'admissió que utilitzant el nou estàndard de <br/>qualitat de servei en xarxes WLAN (EDCA). La utilització del mecanisme <br/>de con

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Coupechoux, Marceau. "Protocoles distribués de contôle d'accès au médium pour réseaux ad hoc fortements chargés." Paris, ENST, 2004. http://www.theses.fr/2004ENST0021.

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Cette thèse apporte une contribution au domaine des protocoles de contrôle d'accès au médium (MAC) for réseaux ad hoc sans fil. Ces réseaux sont par définition créés pour l'occasion et ne nécessitent aucune infrastructure a priori. La norme IEEE 802. 11 permet de réaliser aisément des réseaux ad hoc mais souffre de faiblesses en termes de capacité et d'équité, en particulier à forte charge. Cette thèse propose des alternatives à la norme. Le chapitre 1 dégage de la littérature une classification des protocoles MAC et distingue deux familles : les protocoles basés sur la compétition et ceux san

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Wu, Ricky, and 吳瑞茂. "A Dual Queue Scheme for VoIP on WLAN." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/94063998279600225522.

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碩士<br>國立中興大學<br>電機工程學系<br>93<br>VoIP is a growing popular real time application and becomes more important. Most applications of WLAN are used to transit data. To transit data packets and voice packets at the same under WLAN, voice packets have to compete for bandwidth with data packets. Voice packets will be affected by data packets and cause delay. It will be difficult to achieve excellent voice quality if we use primitive 802.11 WLAN. Our approach is a dual queuing architecture to enhance the VoIP capacity over IEEE 802.11 WLAN by adding a voice packets priority queuing mechanism for MAC la

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Ismail, Usman. "Virtual PCF: Improving VoIP over WLAN performance with legacy clients." Thesis, 2009. http://hdl.handle.net/10012/4510.

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Abstract Voice over IP (VoIP) is one of the fastest growing applications on the Internet. Concurrently, 802.11 Wireless LANs (WLANs) have become ubiquitous in residential, enterprise, campus and public networks. Currently the majority of traffic on WLANs is data traffic but as more people use wireless networks as their primary access medium, a greater portion of traffic will be real-time traffic such as VoIP traffic. Unfortunately 802.11 networks are designed to handle delay-insensitive, bursty traffic and perform poorly for VoIP streams. Experimental and analytical results have shown that a s

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Huang, Chung-Huei, and 黃中暉. "Energy-Efficient Transmission Mechanism for VoIP over IEEE 802.11 WLAN." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/12911391061133799119.

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碩士<br>國立交通大學<br>網路工程研究所<br>95<br>Voice over IP (VoIP) over WLAN (VoWLAN) is an important application for public and private WLANs. However, VoWLAN systems suffer from various technical challenges such as power consumption of WLAN stations (STAs) and VoWLAN capacity issues, making the commercial deployment of large-scale VoWLAN services problematic. This study presents a cross-layer and energy-efficient mechanism for transmitting VoIP packets over IEEE 802.11 WLANs. The proposed mechanism considers the characteristics of VoIP that can tolerate some packet loss, and dynamically disables the medi

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Liau, Jiun-Shiung, and 廖俊雄. "THE IMPLEMENTATION AND PERFORMANCE ANALYSIS OF VoIP OVER 802.11b WLAN." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/76061807933481239296.

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碩士<br>大同大學<br>通訊工程研究所<br>89<br>As the developing of internet, the VoIP applications become more and more in computer communications. One of the latest applications in VoIP is applied the VoIP to the wireless lan(WLAN). In the early 1990, the QoS of VoIP over WLAN can’t satisfy the general users because the available transmission bandwidth of the 802.11 WLAN is too low. For the establishment of 802.11b WLAN, Implementation of the VoIP over WLAN has become the trend of VoIP after the change of available bandwidth of WLAN from 2 M bps to 11 M bps. The QoS of VoIP is a matter of packet delay and p

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"Voice-over-IP (VoIP) over wireless local area networks (WLAN)." 2004. http://library.cuhk.edu.hk/record=b5892251.

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Wang Wei.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2004.<br>Includes bibliographical references (leaves 80-83).<br>Abstracts in English and Chinese.<br>Chapter Chapter 1 --- Introduction --- p.1<br>Chapter 1.1 --- Motivations and Contributions --- p.1<br>Chapter 1.2 --- Organization of the Thesis --- p.4<br>Chapter Chapter 2 --- Background --- p.6<br>Chapter 2.1 --- IEEE 802.11 --- p.6<br>Chapter 2.1.1 --- Distributed Coordination Function (DCF) / Point Coordination Function (PCF) --- p.7<br>Chapter 2.1.2 --- Types of Networks --- p.8<br>Chapter 2.1.3 --- The 802.11 MAC Sub

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Shen, Bo-Fu, and 沈勃甫. "Implementation on VoIP based on SIP for GPRS/WLAN Integration." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/14961389235951575786.

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碩士<br>大同大學<br>資訊工程學系(所)<br>93<br>In this paper, we propose a SIP based architecture that supports roaming for WLAN and GPRS seamless network from the perspective of VoIP services and describes in handoff procedures for WLAN-to-WLAN and WLAN-to-GPRS. This architecture combines layer 3 and 4 for handoff process, in order to decrease packet loss and the end-to-end delay, jitter is kept under control. In Layer 3, Received Signal Strength (RRS) used for handoff detection and Session Initial Protocol (SIP) supports terminal mobility in Layer 4. Therefore, we measure the total handoff time. We used S

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Tsai, Ming-Hsin, and 蔡明興. "Study on Improving VoIP Capacity in WLAN Environments by Using ROHC." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/94325304684819951442.

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碩士<br>國立宜蘭大學<br>資訊工程研究所碩士班<br>98<br>A Voice over Internet Protocol (VoIP) packet is encapsulated by Internet Protocol (IP), User Datagram Protocol (UDP) and Real-time Transport Protocol (RTP) headers. In IEEE 802.11a/b/g wireless environments, the 802.11 data-link layer (i.e. Media Access Control) header and a checksum field should be added to the VoIP packet. Take G.729 as an example, the total length of IPv6 voice packet is 114 bytes, including 94 bytes (82%) header fields. The header overhead occupies more than 80% wireless bandwidth. To reduce header overhead of the IPv4 or IPv6 voice pack

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"Call admission control for adaptive bit-rate VoIP over 802.11 WLAN." 2009. http://library.cuhk.edu.hk/record=b5894068.

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Cui, Yuanyuan.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2009.<br>Includes bibliographical references (p. 64-68).<br>Abstract also in Chinese.<br>Chapter Chapter 1 --- Introduction --- p.1<br>Chapter 1 .1 --- Motivations and Contributions --- p.1<br>Chapter 1.2 --- Related Works --- p.3<br>Chapter 1.3 --- Organization of the Thesis --- p.4<br>Chapter Chapter 2 --- Background --- p.5<br>Chapter 2.1 --- IEEE 802.11 --- p.5<br>Chapter 2.1.1 --- IEEE 802.11 Topologies --- p.5<br>Chapter 2.1.2 --- IEEE 802.11 MAC --- p.8<br>Chapter 2.2 --- Voice over Internet Protocol (VoIP) ---

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Cheng, Ching Wen, and 鄭清文. "The Research of Telecommunication Service Integration Strategy for GSM, VoIP, Wlan." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/75516078654094979049.

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碩士<br>國立臺北大學<br>企業管理學系碩士在職專班<br>91<br>Telecommunication technology fast evolution changes people’s life so fast and convenience. Meanwhile, Telecommunication industry deregulation globally with technologies evolution impacts Telecommunications operator’s profit. Wireless communication and Internet communication consolidation become the most popular application. And Telecommunication operators following the technology trend are hard to make a decision to choose a strategy that integrated new technology with profit business model. This paper studies Telecommunication industry environment, and co

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Huang, Cheng-Ming, and 黃正旻. "Implementation of Dynamic MUX/DEMUX VoIP Gateway in Heterogeneous WLAN and WiMAX Networks." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/dyf48u.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>97<br>Because the relatively long headers in voice packets may cause unnecessary waste in network bandwidth, in this Thesis, we propose a dynamic MUX/DEMUX mechanism to compress the overhead headers in the VoIP packets. The proposed mechanism can dynamically adjust the length of the compressed VoIP packets for multiple VBR voice connections in a mixed WLAN and WiMAX environment. QoS in terms of voice jitter can be guaranteed after the multiplexed voice packets are de-multiplexed. To validate the proposed mechanism, we implement two VoIP MUX/DEMUX gateways on Linux

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"A cross-layer mechanism for QoS improvements in VoIP over multi-rate WLAN networks." Universitat Pompeu Fabra, 2008. http://www.tesisenxarxa.net/TDX-0113110-122900/.

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Chi, Li-Feng, and 錡利鋒. "Using System Dynamics Approach To Forcast Mobile Market Of Influence Between 3G、WLAN and VOIP." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/37169437183115357231.

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碩士<br>開南管理學院<br>企業管理學系碩士班<br>94<br>The purpose of this research is using system dynamics analysis to forecast third generation mobile communication market. We provide the industry a reference by constructing a dynamic market model to simulate the shift of the future. The innovation of WLAN technology not only expands the signal cover area, but also releases the small area limitation of LAN. These improvements make users can utilize and access data anywhere. In the other hand, Skype software prevails the VoIP of communication market. Concerning about these two issues, experts predict that WLAN

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"VoIP capacity over multiple IEEE 802.11 WLANs." 2007. http://library.cuhk.edu.hk/record=b5893472.

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Chan, An.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2007.<br>Includes bibliographical references (leaves 80-84).<br>Abstracts in Chinese and English.<br>Chapter Chapter 1 --- Introduction --- p.1<br>Chapter 1.1 --- Motivations and Contributions --- p.1<br>Chapter 1.2 --- Related Works --- p.3<br>Chapter 1.3 --- Organization of the Thesis --- p.4<br>Chapter Chapter 2 --- Background --- p.5<br>Chapter 2.1 --- IEEE 802.11 --- p.5<br>Chapter 2.1.1 --- Basic IEEE 802.11 Standards --- p.5<br>Chapter 2.1.2 --- Types of Networks --- p.7<br>Chapter 2.2 --- Voice over IP (VoIP) Codec

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Yeh, Chih-Hsiang, and 葉志祥. "Call Admission Control for VoIP in IEEE 802.11 WLANs." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/78164127982022930515.

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碩士<br>臺灣大學<br>電機工程學研究所<br>95<br>Voice over Internet Protocol (VoIP) is no longer only feasible in wired networks, but also applicable through wireless networks as prevalence of wireless networks grows with the technology maturity and rising demand. While making a VoIP call over WiFi wireless networks is applicable, this is not a service with guaranteed quality. With limited bandwidth, an overloaded AP may cause wireless users to experience delayed packets, high packet loss rate, and even low throughput. IEEE 802.11 wireless Local Area Network (WLAN) was originally designed only for data traffi

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Hsu, Chih-Chien, and 徐誌謙. "A Dynamic Load Balancing Scheme for VoIP over WLANs." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/92805592163570468923.

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碩士<br>國立交通大學<br>網路工程研究所<br>95<br>Coverage areas of WLAN access points (APs) are usually overlapped so a WLAN station (STA) might be able to find several APs to attach in a WLAN hotspot. Experimental results indicate that a WLAN STA normally associates with an AP with the maximal signal strength and requests the bandwidth of the AP for establishing network connections. However, this kind of STA-centric association and bandwidth request policy may introduce unbalance loads of APs, and the bandwidths of APs in a WLAN hotspot cannot be fully utilized. This unbalance load problem is a critical issu

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Yeh, Chih-Hsiang. "Call Admission Control for VoIP in IEEE 802.11 WLANs." 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-3008200714485700.

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Wu, Yo-Zan, and 吳祐然. "A Power Saving MAC Mechanism for VoIP over IEEE 802.11e WLANs." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/69732671255627113527.

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碩士<br>國立交通大學<br>資訊科學與工程研究所<br>94<br>Among recent internet applications, Voice-over-IP (VoIP) is one of the appealing ones due to its advantages over traditional telephony, such as low communication cost, high bandwidth and easy creation of new services. However, when it is applied to wireless local area networks (WLANs), power consumption becomes a critical issue for voice stations (handsets) in the network. In this thesis, we propose a power saving MAC mechanism for VoIP applications (PSM-V) based on the IEEE 802.11e EDCA. The basic idea of PSM-V is adding a contention-free period for voice t

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Lu, Hsing-Yu, and 呂幸妤. "A Power-Efficient MAC Protocol for VoIP Traffic over IEEE 802.11e WLANs." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/91483712711121417311.

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碩士<br>國立交通大學<br>資訊科學與工程研究所<br>94<br>Power saving is a critical issue for VoIP over WLANs, especially when using handheld devices. In this thesis, we present an IEEE 802.11e compatible power-efficient MAC protocol to improve the on-demand polling (ODP) scheme. In the ODP scheme, if two consecutive QoS Null frames are received by a QoS AP (QAP), the corresponding QoS station (QSTA) will be removed from the polling list. The proposed Power-Efficient Polling (PEP) scheme uses both the polling-based (HCCA) and contention-based (EDCA) channel access over the hybrid coordination function (HCF) mechan

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Wu, Pei-Yeh, and 吳佩曄. "Design of QoS and Admission Control for VoIP Services over IEEE 802.11e WLANs." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/55256987609739083759.

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碩士<br>國立交通大學<br>資訊工程系所<br>93<br>Supporting telephone services using wireless LAN as the access network is an emerging service. The SIP and IEEE 802.11e are perhaps the two most promising protocols to support such services. In this paper, we show how to integrate SIP and 802.11e to conduct call admission control and resource reservation to support VoIP's QoS in IEEE 802.11e WLANs. Besides, we also suggest some adjustments and MAC enhancements to 802.11e to facilitate VoIP traffics over WLANs.

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Wen, Jia-Jang, and 溫嘉政. "Experimental Analysis of the Effect of Codec Choice on VoIP Voice Quality over WLANs." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/12476256277576878586.

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碩士<br>國立中興大學<br>電機工程學系所<br>97<br>VoIP platform based on SIP has already become the market mainstream gradually, while offering SIP network telephone service to the user of enterprise, besides having efficiency concurrently, saving the cost, its convenience and innovation are motive force and competitiveness that enterprises grow up. So in this thesis, we adopt the concept of Mobile SIP to design the environment of testing, let user movement among a small circle and collocate environment that book by oneself with is it happen different experiment drama is it satisfy actual demand, user of end t

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