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QoS optimization of in-elastic flows stripped over multiple asymmetric channels in mobile networks

QoS optimization of in-elastic flows stripped over multiple ...

引用

2009 International Conference on Ultra Modern Telecommunications and Workshops

作者： Ahmad, Syed Zubair Qadir, Muhammad Abdul Akbar, Mohammad Saeed Center of Semantic and Distributed Computing Mohammad Ali Jinnah University Islamabad Campus Islamabad Pakistan Advanced Computer and GIS Lab. Faculty of Agriculture University of Agriculture Faisalabad Pakistan

ISBN: (纸本)9781424439416

In this paper, we analyze the impact of end-to-end (E2E) delay variation on stripped sessions, whose packets are distributed over multiple links of multi-mode mobile terminal (MMT). The results of this analysis signify the importance of minimized out-of-sequence (OOS) arrival of packets belonging to a stream, while traversing through multiple radio networks to reach their destination. We, then propose a multi-server delay-budget ordered (MDO) scheduling scheme, that schedules backlogged packets on multiple interfaces of MMT according to their residual delay-budget metrics. In the proposed scheme, the impact of E2E delay variation on in-order packet arrival has been minimized through a link ranking function that reduces the impact of delay fluctuations. The simulation results show a consistently high performance metrics for the scheme with respect to end-to-end delay variations, packet drop rate, E2E throughput and in-order arrival which are highly desirable for interactive/ live, and buffered video streams running on MMT devices in uplink or/and downlink paths. ©2009 IEEE.

关键词： Scheduling

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Detection of crashed objects in eACID and its comparision with other techniques

Detection of crashed objects in eACID and its comparision wi...

引用

IEEE International Conference on Multi Topic

作者： Shujaat Hussain Muhammad Abdul Qadir Center for Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad Pakistan

Failure detectors are one of the key components of fault tolerant distributed systems as it is very important to determine the suspected/crashed object and take recovery steps to keep the system going. The main objective of the fault monitoring activity is to quickly and correctly identify the faults. A fault monitoring system which is quick to declare faults increases the chances of false alarms, i.e., declaration of a fault which is actually not a fault. Therefore, an ideal fault monitoring system needs to be as quick as possible in identification of faults without increasing the false alarms. One of the major responsibilities of the monitor is to adapt these intervals according to the dynamic network and system conditions, and set them close to the actual delays in the system. The adaptation of the delays, timeout and monitoring intervals, must not fluctuate with large amplitudes around the actual delays. Otherwise, the number of false alarms would increase or the identification of faults will be delayed. Our algorithm with the name of eACID (enhanced Adaptive Convergent Intelligent fault monitoring in distributed systems), when compared with the best known algorithm, ADAPTATION [Sotama et al.], yielded 16% less false timeouts and 9% more utilization of responses. eACID adapts the timeout on the previous history which gives us a fair idea about the work load and we use it to our advantage. Our scheme does not take decisions on transient behaviors of the system, moreover it has a threshold which is set after having intimate knowledge of past network behavior. These threshold depend on consecutive timeouts occurred/ If this threshold is crossed, it is declared dead.

关键词： Object detection Computer crashes Detectors Fault detection Condition monitoring Fault diagnosis Fault tolerant systems distributed computing Delay systems History

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OntRel: An optimized relational structure for storage of dynamic OWL-DL ontologies

OntRel: An optimized relational structure for storage of dyn...

引用

IEEE International Conference on Multi Topic

作者： Adnan Khalid Syed Adnan Hussain Shah Muhammad Abdul Qadir Center for Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad Pakistan

Ontology is one of the most important components of semantic based information systems which provides context to the document. Ontology enables us to define relationship between different terminologies from diverse domains. To interpret this information and perform reasoning we require to store Ontologies in a way that retrieval becomes easy. Ontologies are defined using OWL (Web ontology language) which is based on XML. All the OWL documents are stored in the form of specialized XML files. With the increase in the semantic Websites number of ontologies describing different domains also grow and with their growth there comes a problem of storing these ontologies. With the passage of time it has been established that RDBMS (relational database management systems) is the most efficient and reliable data structure in terms of storage and retrieval. To store OWL documents in RDBMS multiple techniques have been proposed, but they still lack the advantages of RDBMS. All the databases in RDBMS are closed in nature, but OWL documents are inherently dynamic and semi-structured. So, there is a need to preserve the dynamic OWL documents in the relational structure in such an way that no data or relationship is lost and advantages of RDBMS are also gained. This paper briefly presents the survey of existing ontologies with comparative analysis on the basis of load time and query performance. Secondly, this paper makes a contribution by proposing a rule based approach to improve the downside of earlier techniques.

关键词： Ontologies OWL Relational databases Information retrieval XML distributed computing Information systems Terminology Data structures Performance analysis

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Extensive experimentation with eACID

Extensive experimentation with eACID

引用

International Conference on Emerging Technologies, ICET

作者： Shujaat Hussain Muhammad Abdul Qadir Center for Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad Pakistan

Fault monitoring is one of the main activities of fault tolerant distributed systems. It is required to determine the suspected/crashed component and proactively take the recovery steps to keep the system alive. The main objective of the fault monitoring activity is to quickly and correctly identify the faults. A fault monitoring system which is quick to declare faults increases the chances of false alarms, i.e., declaration of a fault which is actually not a fault. Therefore, an ideal fault monitoring system needs to be as quick as possible in identification of faults without increasing the false alarms. Fault monitor typically detects faults by sending and receiving messages to remote objects and observing the time intervals between a message and its response. One of the major responsibilities of the monitor is to adapt these intervals according to the dynamic network and system conditions, and set them very close to the actual delays in the system. The adaptation of the delays, timeout and monitoring intervals, must not fluctuate with large amplitudes around the actual delays. Otherwise, the number of false alarms would increase or the identification of faults will be delayed. The adaptation should converge to the actual delays very fast. Adaptation of the monitoring interval in the same way as time outs adapt can not be defended. Sometimes, a distributed system (network or other components) may have abrupt change in their state for a very short duration (the transient behavior), the fault monitoring system should bypass these transients behavior, and otherwise the decisions taken on transients will have to be changed to other state very quickly which will add extra overheads both in taking the decision and then reverting it back. Our algorithm with the name of eACID (enhanced Adaptive Convergent Intelligent fault monitoring in distributed systems), when compared with the best known algorithm, ADAPTATION [Sotama et al.], yielded 16% less false timeouts and 9% mor

关键词： Detectors Remote monitoring Fault diagnosis Delay Condition monitoring distributed computing Computer crashes Fault detection Fault tolerant systems Object detection

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Service optimization of in-elastic flows stripped over multiple asymmetric mobile channels

Service optimization of in-elastic flows stripped over multi...

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IEEE International Conference on Multi Topic

作者： Syed Zubair Ahmad Muhammad Abdul Qadir Muhammad Saeed Akbar Center of Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad Pakistan

In this paper, we present a stateless multi-server guaranteed rate scheduling service model that utilizes multiple, asymmetric wireless channels to maximize service guarantees for in-elastic flows. One of the major consequences of multichannel flow forwarding is the increased intra-path and inter-path end-to-end delay variations between successive packets of a stream. These variations cause problems in achieving desired service levels due to increased reorder overhead, higher packet drop-rate, and higher buffer maintenance overhead. We have aggregated the capacity of available wireless channels through a link monitoring function (LMF) and has formulated a multi-server scheduling model that ensures tight delay-bounds and lower service latency to minimize inter-path delay variations and out-of-sequence arrival. The simulation results show consistently higher performance metrics of the scheme w.r.t. end-to-end delay variations, in-order arrival, and service latency that enable reliable, scalable, guaranteed rate service during mobility.

关键词： Delay Clocks Traffic control Quality of service Maintenance Mobile computing distributed computing Processor scheduling Monitoring Measurement

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A benchmark for fault monitors in distributed systems

A benchmark for fault monitors in distributed systems

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International Conference on Emerging Technologies, ICET

作者： Shujaat Hussain Muhammad Abdul Qadir Center for Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad Pakistan

关键词： Detectors Condition monitoring Computer crashes Remote monitoring distributed computing Fault diagnosis Fault detection Delay effects Fault tolerant systems Convergence

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引用

International Conference on Computer, Control and Communication

作者： Muhammad Fahad Muhammad Abdul Qadir Center of Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad Pakistan

ISBN: (纸本)9781424433131

One of the core tasks of mapping and merging of multiple ontologies is to produce accurate, consistent and coherent merged global ontology that promotes interoperability among heterogeneous multi-vendors semantic-based systems. Current systems for ontology mapping and merging are very restricted in terms of resolving mismatches or proposing accurate matches with no or minimum human intervention. The suggestions made by these systems do not consider all information available in the semantic knowledge of the ontologies. We developed a semantic based ontology merging system, DKP-OM that employs almost all the semantics provided in the ontologies. This paper discusses the similarity computation factors considered by DKP-OM for providing complete, consistent and coherent merged ontology. These factors find the correspondences between the concepts of ontologies and check the consistency of initial mappings found. The concept of validation during the initial stages of ontology mapping not only distinguishes our system from the existing ones' but also reduces the users' dependability for validating the consistency of the generated mappings.

关键词： Ontologies Merging Humans distributed computing Machine learning Probability Dynamic programming Runtime Process design Terminology

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Adaptive congestion control mechanism of TCP flows for performance optimization in mobile heterogeneous wireless networks

Adaptive congestion control mechanism of TCP flows for perfo...

引用

International Conference on Computer, Control and Communication

作者： Muhammad Saeed Akbar Syed Zubair Ahmad Muhammad Abdul Qadir Center of Distributed and Semantic Computing (CDSC) Mohammad Ali Jinnah University Islamabad Pakistan

ISBN: (纸本)9781424433131

The transmission control protocol (TCP) provides reliable transport services between end-points and enjoys predominant share as carrier of data traffic over Internet. Last mile wireless links have challenged TCP effectiveness because of fluctuations in link quality and relatively low data rates. These fluctuations cause major performance degradation in terms of reduced throughput, increased retransmission and weak fairness attributes in TCP. A TCP performance in wireless environment has been active research issue. In this paper, we propose Adaptive TCP variant which adjust congestion window adaptively and avoid congestion on network for performance optimization.. The key contribution of the proposal lies in exchanging mobility related messages between sender and receiver on the basis of lower layer triggers to handle timeout related issues in the context of mobility constraints and adjust the congestion window adaptively with respect to link characteristics. This article presents the adaptive congestion mechanism and describes the simulation results of NS 2. The result shows that Adaptive TCP provides the 10.25% to 53.75% improvement in throughput over other TCP variants in dynamically varying wireless networks conditions.

关键词： Programmable control Adaptive control Optimization Wireless networks Fluctuations Throughput Transport protocols Communication system traffic control Web and internet services Degradation

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Dependable Quality-of-Service Provisioning through Aggregate Scheduling of Multiple Service Classes on Heterogeneous Wireless Channels

Dependable Quality-of-Service Provisioning through Aggregate...

引用

2009 First International Conference on Future Information Networks(第一届未来信息网络国际会议)

作者： Syed Zubair Ahmad Muhammad Abdul Qadir Mohammad Saeed Akbar Center of Semantic and Distributed Computing Mohammad Ali Jinnah University Islamabad campus IslamabadPakistan

In this paper, we analyze the impact of end-to-end (E2E) delay variation on stripped sessions, whose packets are distributed over multiple links of multimode mobile terminal (MMT). The results of this analysis signify the importance of minimized out-ofsequence (OOS) arrival of packets belonging to a stream, while traversing through multiple radio networks to reach their destination. We, then propose a multi-server delay-budget ordered (MDO) scheduling scheme, that schedules back-logged packets on multiple interfaces of MMT according to their residual delay-budget metrics. In the proposed scheme, the impact of E2E delay variation on in-order packet arrival has been minimized through a link ranking function that reduces the impact of delay fluctuations. The simulation results show a consistently high performance metrics for the scheme with respect to end-to-end delay variations, packet drop rate, E2E throughput and in-order arrival which are highly desirable for interactive/live, and buffered video streams running on MMT devices in uplink or/and downlink paths.

关键词： component multi-server delay-budget ordered scheduling Quality-of-service(QoS) out-of-sequence(OOS) packet arrival capacity aggregation one-way trip time estimation

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QoS optimization of in-elastic flows stripped over multiple asymmetric channels in mobile networks

QoS optimization of in-elastic flows stripped over multiple ...

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International Conference on Ultra Modern Telecommunications and Workshops (ICUMT)

作者： Syed Zubair Ahmad Muhammad Abdul Qadir Mohammad Saeed Akbar Center of Semantic and Distributed Computing Mohammad Ali Jinnah University Islamabad Pakistan Faculty of Agriculture University of Agriculture Faisalabad Pakistan

In this paper, we analyze the impact of end-to-end (E2E) delay variation on stripped sessions, whose packets are distributed over multiple links of multi-mode mobile terminal (MMT). The results of this analysis signify the importance of minimized out-of-sequence (OOS) arrival of packets belonging to a stream, while traversing through multiple radio networks to reach their destination. We, then propose a multi-server delay-budget ordered (MDO) scheduling scheme, that schedules backlogged packets on multiple interfaces of MMT according to their residual delay-budget metrics. In the proposed scheme, the impact of E2E delay variation on in-order packet arrival has been minimized through a link ranking function that reduces the impact of delay fluctuations. The simulation results show a consistently high performance metrics for the scheme with respect to end-to-end delay variations, packet drop rate, E2E throughput and in-order arrival which are highly desirable for interactive/live, and buffered video streams running on MMT devices in uplink or/and downlink paths.

关键词： Mobile computing Delay estimation Downlink Delay effects Processor scheduling Agriculture Transport protocols Bandwidth distributed computing Radio network

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