Adaptive QoS scheduling in wireless cellular networks |
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Authors: | Ramtin Kazemi Beidokhti Mohammad Hossein Yaghmaee Moghaddam Jalil Chitizadeh |
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Affiliation: | (1) Ferdowsi University of Mashhad, Mashhad, Iran |
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Abstract: | Quality of service (QoS) has been always controversial in resource shared networks. Scheduling as a packet prioritizing mechanism
at Data Link Layer (DLL) contributes to QoS guarantee provisioning significantly. In this paper, a novel packet scheduler
is developed in wireless cellular networks. The proposed scheme provides QoS-guaranteed service for the applications running
on the sensor nodes in all the three aspects of QoS, i.e. data rate, packet loss and packet delay with regard to jitter simultaneously.
We establish a three-dimensional space with certain basis vectors for QoS and introduce the efficient point of performance
in terms of QoS provisioning in that space. Then we develop a generalized metric, the QoS-deviation, which is the Euclidean distance between the QoS work point of flows and the QoS efficient point in the proposed space. Based
on this metric, a novel scheduling approach, namely AQDC, is designed which makes it possible to tune the trade-off between
QoS provisioning and throughput optimization in an adaptive manner depending on the current Cell
QoS-deviation level (CDL). Furthermore, we also develop another scheduler, namely ARTC, which is the residual-time version of the AQDC scheduler. Finally, a QoS-deviation-based CAC policy will be introduced which can be applied to all schedulers
without any consideration about their structure and can be employed in cellular packet switched networks. |
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