A IEEE 802.11e HCCA Scheduler with a Reclaiming Mechanism for Multimedia Applications
The QoS offered by the IEEE 802.11e reference scheduler is satisfactory in the case of Constant Bit Rate traffic streams, but not yet in the case of Variable Bit Rate traffic streams, whose variations stress its scheduling behavior. Despite the numerous proposed alternative schedulers with QoS, mult...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Advances in Multimedia |
| Online Access: | http://dx.doi.org/10.1155/2014/372693 |
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| author | Anna Lina Ruscelli Gabriele Cecchetti |
| author_facet | Anna Lina Ruscelli Gabriele Cecchetti |
| author_sort | Anna Lina Ruscelli |
| collection | DOAJ |
| description | The QoS offered by the IEEE 802.11e reference scheduler is satisfactory in the case of Constant Bit Rate traffic streams, but not yet in the case of Variable Bit Rate traffic streams, whose variations stress its scheduling behavior. Despite the numerous proposed alternative schedulers with QoS, multimedia applications are looking for refined methods suitable to ensure service differentiation and dynamic update of protocol parameters. In this paper a scheduling algorithm, Unused Time Shifting Scheduler (UTSS), is deeply analyzed. It is designed to cooperate with a HCCA centralized real-time scheduler through the integration of a bandwidth reclaiming scheme, suitable to recover nonexhausted transmission time and assign that to the next polled stations. UTSS dynamically computes with an O(1) complexity transmission time providing an instantaneous resource overprovisioning. The theoretical analysis and the simulation results highlight that this injection of resources does not affect the admission control nor the centralized scheduler but is suitable to improve the performance of the centralized scheduler in terms of mean access delay, transmission queues length, bursts of traffic management, and packets drop rate. These positive effects are more relevant for highly variable bit rate traffic. |
| format | Article |
| id | doaj-art-d77ad1b36a1f4d329c84372aec8dae74 |
| institution | Kabale University |
| issn | 1687-5680 1687-5699 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Multimedia |
| spelling | doaj-art-d77ad1b36a1f4d329c84372aec8dae742025-02-03T07:24:26ZengWileyAdvances in Multimedia1687-56801687-56992014-01-01201410.1155/2014/372693372693A IEEE 802.11e HCCA Scheduler with a Reclaiming Mechanism for Multimedia ApplicationsAnna Lina Ruscelli0Gabriele Cecchetti1TeCIP Institute, Scuola Superiore Sant’Anna, 56124 Pisa, ItalyTeCIP Institute, Scuola Superiore Sant’Anna, 56124 Pisa, ItalyThe QoS offered by the IEEE 802.11e reference scheduler is satisfactory in the case of Constant Bit Rate traffic streams, but not yet in the case of Variable Bit Rate traffic streams, whose variations stress its scheduling behavior. Despite the numerous proposed alternative schedulers with QoS, multimedia applications are looking for refined methods suitable to ensure service differentiation and dynamic update of protocol parameters. In this paper a scheduling algorithm, Unused Time Shifting Scheduler (UTSS), is deeply analyzed. It is designed to cooperate with a HCCA centralized real-time scheduler through the integration of a bandwidth reclaiming scheme, suitable to recover nonexhausted transmission time and assign that to the next polled stations. UTSS dynamically computes with an O(1) complexity transmission time providing an instantaneous resource overprovisioning. The theoretical analysis and the simulation results highlight that this injection of resources does not affect the admission control nor the centralized scheduler but is suitable to improve the performance of the centralized scheduler in terms of mean access delay, transmission queues length, bursts of traffic management, and packets drop rate. These positive effects are more relevant for highly variable bit rate traffic.http://dx.doi.org/10.1155/2014/372693 |
| spellingShingle | Anna Lina Ruscelli Gabriele Cecchetti A IEEE 802.11e HCCA Scheduler with a Reclaiming Mechanism for Multimedia Applications Advances in Multimedia |
| title | A IEEE 802.11e HCCA Scheduler with a Reclaiming Mechanism for Multimedia Applications |
| title_full | A IEEE 802.11e HCCA Scheduler with a Reclaiming Mechanism for Multimedia Applications |
| title_fullStr | A IEEE 802.11e HCCA Scheduler with a Reclaiming Mechanism for Multimedia Applications |
| title_full_unstemmed | A IEEE 802.11e HCCA Scheduler with a Reclaiming Mechanism for Multimedia Applications |
| title_short | A IEEE 802.11e HCCA Scheduler with a Reclaiming Mechanism for Multimedia Applications |
| title_sort | ieee 802 11e hcca scheduler with a reclaiming mechanism for multimedia applications |
| url | http://dx.doi.org/10.1155/2014/372693 |
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