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Predictive Quality Of Service Schemes For Real-Time Multimedia Applications In Communications

In guaranteed QoS resources are reserved based on the worst-case analysis. This scheme guarantees QoS but results in low resource utilisation, subsequently depriving other users from acquiring service. In contrary, predictive QoS allocates an initial amount of resource, whereby QoS is guaranteed...

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Main Author: Subramaniam, Shamala
Format: Thesis
Language:English
English
Published: 1999
Online Access:http://psasir.upm.edu.my/id/eprint/11893/1/FSKTM_1999_5_A.pdf
http://psasir.upm.edu.my/id/eprint/11893/
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spelling my.upm.eprints.118932011-07-19T05:29:44Z http://psasir.upm.edu.my/id/eprint/11893/ Predictive Quality Of Service Schemes For Real-Time Multimedia Applications In Communications Subramaniam, Shamala In guaranteed QoS resources are reserved based on the worst-case analysis. This scheme guarantees QoS but results in low resource utilisation, subsequently depriving other users from acquiring service. In contrary, predictive QoS allocates an initial amount of resource, whereby QoS is guaranteed with a certain probability of degradation. This scheme is tailored for applications that are adaptive and robust towards sudden fluctuations in the service provided. The nature of multimedia data such as the variable bit rate has encouraged the implementation of predictive Quality of Service (QoS) as compared to guaranteed QoS. In a typical QoS scheme, two factors contribute to the computation of packet loss, which are : (i) a new packet dropped due to buffer overflow and (ii) a buffered packet dropped due to expired delay. The buffer resource is increased when the observed packet loss ratio has violated the requested level of packet loss ratio. The limitations in this scheme is caused by the admission of all packets into the buffer, inclusive of packets that will eventually be dropped due to expired delay. Subsequently, this results in poor resource management. In this research, two pro-active dynamic QoS control schemes are designed, the dynamic QoS control scheme with delay estimation, and the hybrid dynamic QoS control scheme. In both schemes, every new packet arrival is compared against the estimated delay it will experience, before being admitted into the buffer. If the estimated delay expires the requested delay bound, then the packet is dropped. In the hybrid scheme, every packet is checked before being admitted into the buffer, and also, the packets successfully admitted into the buffer are evaluated on the actual delay experienced before being transmitted to the receIver. The results obtained through the simulation models have shown that two schemes have significantly improved the average delay for different traffic patterns. In addition to improving the average delay in delay sensitive traffic, improvement is seen in the average packet loss ratio, and subsequently increasing the throughput for delay sensitive traffic. However, in packet loss sensitive traffic, the old scheme remains beneficial. The proposed scheme can be adopted for multimedia applications to enhance the QoS in terms of better delay and improved utilisation. 1999-03 Thesis NonPeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/11893/1/FSKTM_1999_5_A.pdf Subramaniam, Shamala (1999) Predictive Quality Of Service Schemes For Real-Time Multimedia Applications In Communications. Masters thesis, Universiti Putra Malaysia. English
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
English
description In guaranteed QoS resources are reserved based on the worst-case analysis. This scheme guarantees QoS but results in low resource utilisation, subsequently depriving other users from acquiring service. In contrary, predictive QoS allocates an initial amount of resource, whereby QoS is guaranteed with a certain probability of degradation. This scheme is tailored for applications that are adaptive and robust towards sudden fluctuations in the service provided. The nature of multimedia data such as the variable bit rate has encouraged the implementation of predictive Quality of Service (QoS) as compared to guaranteed QoS. In a typical QoS scheme, two factors contribute to the computation of packet loss, which are : (i) a new packet dropped due to buffer overflow and (ii) a buffered packet dropped due to expired delay. The buffer resource is increased when the observed packet loss ratio has violated the requested level of packet loss ratio. The limitations in this scheme is caused by the admission of all packets into the buffer, inclusive of packets that will eventually be dropped due to expired delay. Subsequently, this results in poor resource management. In this research, two pro-active dynamic QoS control schemes are designed, the dynamic QoS control scheme with delay estimation, and the hybrid dynamic QoS control scheme. In both schemes, every new packet arrival is compared against the estimated delay it will experience, before being admitted into the buffer. If the estimated delay expires the requested delay bound, then the packet is dropped. In the hybrid scheme, every packet is checked before being admitted into the buffer, and also, the packets successfully admitted into the buffer are evaluated on the actual delay experienced before being transmitted to the receIver. The results obtained through the simulation models have shown that two schemes have significantly improved the average delay for different traffic patterns. In addition to improving the average delay in delay sensitive traffic, improvement is seen in the average packet loss ratio, and subsequently increasing the throughput for delay sensitive traffic. However, in packet loss sensitive traffic, the old scheme remains beneficial. The proposed scheme can be adopted for multimedia applications to enhance the QoS in terms of better delay and improved utilisation.
format Thesis
author Subramaniam, Shamala
spellingShingle Subramaniam, Shamala
Predictive Quality Of Service Schemes For Real-Time Multimedia Applications In Communications
author_facet Subramaniam, Shamala
author_sort Subramaniam, Shamala
title Predictive Quality Of Service Schemes For Real-Time Multimedia Applications In Communications
title_short Predictive Quality Of Service Schemes For Real-Time Multimedia Applications In Communications
title_full Predictive Quality Of Service Schemes For Real-Time Multimedia Applications In Communications
title_fullStr Predictive Quality Of Service Schemes For Real-Time Multimedia Applications In Communications
title_full_unstemmed Predictive Quality Of Service Schemes For Real-Time Multimedia Applications In Communications
title_sort predictive quality of service schemes for real-time multimedia applications in communications
publishDate 1999
url http://psasir.upm.edu.my/id/eprint/11893/1/FSKTM_1999_5_A.pdf
http://psasir.upm.edu.my/id/eprint/11893/
_version_ 1643824892757409792
score 13.211869

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