Collision Resolution Schemes with Nonoverlapped Contention Slots for Heterogeneous and Homogeneous WLANs
CSMA/CA-based DCF of 802.11 MAC layer employs a best-effort delivery model, in which stations compete for channel access with the same priority. In a heterogeneous network, providing different priorities to different applications for required quality of service is a challenging task, since heterogen...
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | Journal of Engineering |
| Online Access: | http://dx.doi.org/10.1155/2013/852959 |
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| author | Raksha Upadhyay Prakash D. Vyavahare Sanjiv Tokekar |
| author_facet | Raksha Upadhyay Prakash D. Vyavahare Sanjiv Tokekar |
| author_sort | Raksha Upadhyay |
| collection | DOAJ |
| description | CSMA/CA-based DCF of 802.11 MAC layer employs a best-effort delivery model, in which stations compete for channel access with the same priority. In a heterogeneous network, providing different priorities to different applications for required quality of service is a challenging task, since heterogeneous conditions result in unfairness among stations and degradation in the throughput. This paper proposes a class of collision resolution schemes for 802.11 having contention window control with nonoverlapped contention slots. In the first scheme, window ranges of two consecutive stages are nonoverlapped, and it is called nonoverlapped contention slots (NOCS) scheme. In the other scheme, termed as NOCS-offset, an offset is introduced between window ranges of two stages. Selection of a random value by a station for its contention with discontinuous distribution results in reduced probability of collision. Analytical and simulation results show that the proposed scheme exhibits higher throughput and fairness with reduced delay and collision probability in homogeneous and heterogeneous networks. Performance of the proposed scheme is evaluated for mix traffic and high data rate environment with advanced back-off management techniques to meet the requirements of the present applications. |
| format | Article |
| id | doaj-art-c6c5ca6b2a834c198d32d45ae9ae2929 |
| institution | Kabale University |
| issn | 2314-4904 2314-4912 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Engineering |
| spelling | doaj-art-c6c5ca6b2a834c198d32d45ae9ae29292025-02-03T01:22:32ZengWileyJournal of Engineering2314-49042314-49122013-01-01201310.1155/2013/852959852959Collision Resolution Schemes with Nonoverlapped Contention Slots for Heterogeneous and Homogeneous WLANsRaksha Upadhyay0Prakash D. Vyavahare1Sanjiv Tokekar2Department of Electronics and Telecommunication Engineering, Institute of Engineering and Technology, DAVV, Indore 452017, IndiaDepartment of Electronics and Telecommunication Engineering, Shri G. S. Institute of Technology and Science, Indore 452003, IndiaDepartment of Electronics and Telecommunication Engineering, Institute of Engineering and Technology, DAVV, Indore 452017, IndiaCSMA/CA-based DCF of 802.11 MAC layer employs a best-effort delivery model, in which stations compete for channel access with the same priority. In a heterogeneous network, providing different priorities to different applications for required quality of service is a challenging task, since heterogeneous conditions result in unfairness among stations and degradation in the throughput. This paper proposes a class of collision resolution schemes for 802.11 having contention window control with nonoverlapped contention slots. In the first scheme, window ranges of two consecutive stages are nonoverlapped, and it is called nonoverlapped contention slots (NOCS) scheme. In the other scheme, termed as NOCS-offset, an offset is introduced between window ranges of two stages. Selection of a random value by a station for its contention with discontinuous distribution results in reduced probability of collision. Analytical and simulation results show that the proposed scheme exhibits higher throughput and fairness with reduced delay and collision probability in homogeneous and heterogeneous networks. Performance of the proposed scheme is evaluated for mix traffic and high data rate environment with advanced back-off management techniques to meet the requirements of the present applications.http://dx.doi.org/10.1155/2013/852959 |
| spellingShingle | Raksha Upadhyay Prakash D. Vyavahare Sanjiv Tokekar Collision Resolution Schemes with Nonoverlapped Contention Slots for Heterogeneous and Homogeneous WLANs Journal of Engineering |
| title | Collision Resolution Schemes with Nonoverlapped Contention Slots for Heterogeneous and Homogeneous WLANs |
| title_full | Collision Resolution Schemes with Nonoverlapped Contention Slots for Heterogeneous and Homogeneous WLANs |
| title_fullStr | Collision Resolution Schemes with Nonoverlapped Contention Slots for Heterogeneous and Homogeneous WLANs |
| title_full_unstemmed | Collision Resolution Schemes with Nonoverlapped Contention Slots for Heterogeneous and Homogeneous WLANs |
| title_short | Collision Resolution Schemes with Nonoverlapped Contention Slots for Heterogeneous and Homogeneous WLANs |
| title_sort | collision resolution schemes with nonoverlapped contention slots for heterogeneous and homogeneous wlans |
| url | http://dx.doi.org/10.1155/2013/852959 |
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