Optimization technique for configuring IEEE 802.11b access point parameters to improve VoIP performance

Chakraborty, Tamal; Mukhopadhyay, Atri; Misra, Iti Saha; Sanyal, Sugata

doi:10.1109/iccitechn.2010.5723919

Cited by 11 publications

(9 citation statements)

References 8 publications

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“…This is due to buffer overflow in the APs. Having an extended buffer size to decrease loss in packets due to buffer overflow is not recommended as it results in higher latency that is undesirable for real-time traffic as described in [14].…”

Section: Methodology Of Analysismentioning

confidence: 97%

“…Table I shows the attributes for the chosen codecs. to the wireless medium following a R TS-CTS exchange [14]. Therefore, as the number of packets arriving at the AP increases, the AP buffer gets filled up quickly.…”

Section: Methodology Of Analysismentioning

confidence: 98%

“…Any packet whose length is greater than the RTS threshold is transmitted following a RTS-CTS (Clear to Send) exchange [14]. As a consequence, with increase in payload size, every packet has to wait in the AP before transmission for R TS-CTS exchange to take place thereby increasing the medium access delay.…”

Section: Methodology Of Analysismentioning

confidence: 99%

See 2 more Smart Citations

Active queue management with adaptive codec bit rate variation in WLAN for efficient VoIP performance

Chakraborty

Mukhopadhyay

Misra

et al. 2011

14th International Conference on Computer and Information Technology (ICCIT 2011)

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VoIP over Wireless LANs is greatly aff ected by path loss, RF interference and other sources of signal attenuation in addition to network congestion. The primary factors involved in effective real-time communication, namely delay and loss, must be within certain controlled limits in such a scenario. Wireless LAN Access Points must, therefore, act in tune with the codecs to ensure high quality of the ongoing VoIP sessions. In this paper, we analyze the various codec parameters with respect to wireless LAN APs. Thereafter, we develop an optimization algorithm based on proactive strategy to keep loss and latency within tolerable limits. Finally, we implement the algorithm in our test-bed to provide optimum Voice over IP (VoIP) performance.

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Section: Methodology Of Analysismentioning

confidence: 97%

Section: Methodology Of Analysismentioning

confidence: 98%

See 1 more Smart Citation

Active queue management with adaptive codec bit rate variation in WLAN for efficient VoIP performance

Chakraborty

Mukhopadhyay

Misra

et al. 2011

14th International Conference on Computer and Information Technology (ICCIT 2011)

Self Cite

View full text Add to dashboard Cite

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“…Following the principle of RTS-CTS mechanism with respect to AP buffers as described in [24], Total Medium Access Delay (D ma ) = total number of arrived packets X medium access delay for selective packets…”

Section: A Methodology Of Analysismentioning

confidence: 99%

Proactive QoS Enhancement Technique for Efficient VoIP Performance over Wireless LAN and Cognitive Radio Network

Chakraborty¹,

Misra²,

Sanyal³

2012

JNW

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VoIP over Wireless LANs is greatly affected bypath-loss, RF interference and other sources of signalattenuation in addition to network congestion. The primaryfactors involved in effective real-time communication,namely delay and loss, must be within certain controlledlimits in such a scenario. Wireless LAN Access Points must,therefore, act in tune with the codecs to ensure high qualityof the ongoing VoIP sessions. Further deployment of VoIPin opportunistic communication medium like cognitiveradio network requires thorough analysis of the factorsinvolved in design and implementation of such networksalong with modifications in VoIP parameters. In this paper,the various codec parameters are analyzed with respect towireless LAN access points. Thereafter, an optimizationalgorithm is developed based on proactive strategy to keeploss and latency within tolerable limits. The proposedalgorithm is hence implemented in the SIP enabled test-bedto provide optimum Voice over IP (VoIP) performance. Theproactive strategy is further applied to study VoIPperformance over cognitive radio networks. A simulationmodel is developed for VoIP transmission in cognitive radionetworks with two scenarios where the primary and thesecondary user involve in VoIP transmission respectively.For each scenario, extensive analysis of both VoIP and CRNparameters is performed and an algorithm is proposedbased on codecs and active queues to ensure highthroughput of VoIP traffic with enhanced QoS. Resultsverify significant performance improvement in VoIP callquality under both wireless LAN and cognitive radionetwork environment. Simulation and measured resultshave also been included

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“…• Aquisitional efficiency -Existing optimization techniques can be incorporated into the proposed algorithm. For example in our implementation, as wireless calls are being made, parameter optimizations of APs as described in [40] can also be implemented. Moreover, techniques for enhancing VoIP performance under congested scenarios can also be incorporated in this work, for example, by varying the packet payload size as suggested in [41].…”

Section: Benefitsmentioning

confidence: 99%

VOIP Call Optimization in Diverse Network Scenarios Using Learning Based State-Space Search Technique

Chakraborty¹,

Mukhopadhyay²,

Misra³

et al. 2011

IJWMN

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A VoIP based call has stringent QoS requirements with respect to delay, jitter, loss, MOS and R-Factor. Various QoS mechanisms implemented to satisfy these requirements must be adaptive under diverse network scenarios and applied in proper sequence, otherwise they may conflict with each other. The objective of this paper is to address the problem of adaptive QoS maintenance and sequential execution of available QoS implementation mechanisms with respect to VoIP under varying network conditions. In this paper, we generalize this problem as state-space problem and solve it. Firstly, we map the problem of QoS optimization into state-space domain and apply incremental heuristic search. We implement the proposed algorithm under various network and user scenarios in a VoIP test-bed for QoS enhancement.Then learning strategy is implemented for refinement of knowledge base to improve the performance of call quality over time. Finally, we discuss the advantages and uniqueness of our approach.

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Optimization technique for configuring IEEE 802.11b access point parameters to improve VoIP performance

Cited by 11 publications

References 8 publications

Active queue management with adaptive codec bit rate variation in WLAN for efficient VoIP performance

Active queue management with adaptive codec bit rate variation in WLAN for efficient VoIP performance

Proactive QoS Enhancement Technique for Efficient VoIP Performance over Wireless LAN and Cognitive Radio Network

VOIP Call Optimization in Diverse Network Scenarios Using Learning Based State-Space Search Technique

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