Investigation of the IEEE 802.11 medium access control (MAC) sublayer functions

Crow, Brian P.; Widjaja, Indra; Kim, J.G.; Sakai, Prescott

doi:10.1109/infcom.1997.635122

Cited by 79 publications

(36 citation statements)

References 5 publications

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“…Although the PCF mode is designed for real-time traffic [1], [2], it is not widely deployed due to its inefficient polling schemes, limited quality of service (QoS) provisioning, and implementation complexity. 1 On the other hand, supporting voice traffic over WLANs using the DCF mode poses significant challenges, because the performance characteristics of their physical and MAC layers are much worse than their wireline counterparts. The voice capacity of a WLAN, which is defined as the maximum number of voice connections that can be supported with satisfactory userperceived quality, has been actively investigated both experimentally and analytically.…”

Section: Introductionmentioning

confidence: 99%

Voice capacity analysis of WLAN with unbalanced traffic

Cai

Shen

Mark

et al. 2006

IEEE Trans. Veh. Technol.

190

139

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Abstract-An analytical model to study the performance of wireless local area networks (WLANs) supporting asymmetric nonpersistent traffic using the IEEE 802.11 distributed coordination function mode for medium access control (MAC) is developed. Given the parameters of the MAC protocol and voice codecs, the voice capacity of an infrastructure-based WLAN, in terms of the maximum number of voice connections that can be supported with satisfactory user-perceived quality, is obtained. In addition, voice capacity analysis reveals how the overheads from different layers, codec rate, and voice packetization interval affect voice traffic performance in WLANs, which provides an important guideline for network planning and management. The analytical results can be used for effective call admission control to guarantee the quality of voice connections. Extensive simulations have been performed to validate the analytical results.Index Terms-IEEE 802.11 DCF, unbalanced traffic, voice capacity.

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Section: Introductionmentioning

confidence: 99%

Voice capacity analysis of WLAN with unbalanced traffic

Cai

Shen

Mark

et al. 2006

IEEE Trans. Veh. Technol.

190

139

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“…In 802.11 CS is performed at Physical Layer also called as Physical Carrier Sensing and MAC layer also termed as Virtual Carrier Sensing. [5] [9].DCF allow medium sharing between nodes using CSMA/CA protocol. Two channel access mechanisms are used in DCF: Basic Access Mechanism & RTS/CTS Mechanism.…”

Section: Operational Mode Of Conventional Dcfmentioning

confidence: 99%

Performance Investigation of 802.11 MAC DCF

Choubey¹

2012

IJDPS

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“…In particular, the hypothesis of working in saturated condition is not correct for VoIP traffic as demonstrated in (Zhai et al, 2005). Prior work that pertains to study VoIP over IEEE 802.11 has focused mainly on Point Coordination Function (PCF) as access protocol, for instance in (Crow et al, 1997) and in (Veeraraghavan et. al., 2001).…”

Section: Voip Over Single Hop Wlan 321 Background and State Of The Artmentioning

confidence: 99%

Experimental Characterization of VoIP Traffic over IEEE 802.11 Wireless LANs

Dini¹,

Portolés-Comeras²,

Nin-Guerrero³

et al. 2011

VoIP Technologies

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IntroductionVoice over Internet Protocol (VoIP) technology has become a potential alternative to and also a supplement of the traditional telephony systems over the Public Switched Telephone Network (PSTN), providing a versatile, flexible and cost-effective solution to speech communications. VoIP allows the transmission of voice signals from one party to another one digitally, i.e., the analog voice signal is coded into small packets of digital data and sent over a network. The traditional telephone network, PSTN, uses the circuit switching technique, in which the network establishes a dedicated end-to-end connection between two hosts. The resources needed to support the communication between these end systems are reserved for the whole duration of the communication, so as to guarantee a given quality of the communication. The main drawback of circuit switching is its lack of flexibility due to the fact that dedicated circuits are idle during silent periods and thus network resources are wasted during these contemplation periods. Unlike PSTN, VoIP networks use packet switching, which sends digitized voice data packets over the networks using many possible paths. The packets are reassembled at their destination to generate the voice signals. Network resources are not reserved in VoIP networks, i.e. voice packets are sent into the network without reserving any bandwidth. On the one hand this method provides more flexibility to the network but, on the other hand, it suffers from congestions. Voice applications are delay intolerant services, therefore voice quality at the end host is not guaranteed in VoIP networks. Nowadays, the pervasiveness of WLAN networks together with the spread of VoIP capable wireless devices has motivated an extensive use of VoIP applications over WLAN networks. However, the interaction between these two technologies (VoIP and WLAN) is still not well understood and has received much attention from the research community during recent years. When the VoIP communication has to travel through a WLAN link congestion problems are hardened due to the shared nature of radio medium, the error prone channel and the limited bandwidth of the link, which can cause a further degradation of the voice quality.

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Investigation of the IEEE 802.11 medium access control (MAC) sublayer functions

Cited by 79 publications

References 5 publications

Voice capacity analysis of WLAN with unbalanced traffic

Voice capacity analysis of WLAN with unbalanced traffic

Performance Investigation of 802.11 MAC DCF

Experimental Characterization of VoIP Traffic over IEEE 802.11 Wireless LANs

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