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Throughput Analysis of Routing Algorithms in 802.11s-Based Wireless Mesh Networks
, M.Sc. Thesis Sharif University of Technology ; Ashtiani, Farid (Supervisor)
Abstract
Wireless Mesh Networks (WMNs) can be considered as the result of cooperation among two ad hoc networks, one composed of Mesh Points (MPs) and another one composed of Mesh Clients (MCs) as well as corresponding Access (Mesh) Points. Each one has its own functions and properties. This cooperation results in a flexible network that to fully demonstrate its potentials, requires special routing algorithms and access schemes.Here, we study and analyze three routing algorithms in IEEE 802.11s-based WMNs from throughput point of view. To this end, each node in the network is modeled by a queue during Contention-Free Periods (CFPs). During Contention-Based Period, however, to simplify modeling, we...
Overview of IEEE 802.15.2: Coexistence of Wireless Personal Area Networks with Other Unlicensed Frequency Bands Operating Wireless Devices
, Article Emerging Wireless LANs, Wireless PANs, and Wireless MANs: IEEE 802.11, IEEE 802.15, 802.16 Wireless Standard Family ; 2008 , Pages 135-150 ; 9780471720690 (ISBN) ; Xiao, Y ; Latva Aho, M ; Hossein Khalaj, B ; Sharif University of Technology
John Wiley & Sons, Inc
2008
Analysis of the downlink saturation throughput of an asymmetric IEEE 802.11n-based WLAN
, Article 2016 IEEE International Conference on Communications, ICC 2016, 22 May 2016 through 27 May 2016 ; 2016 ; 9781479966646 (ISBN) ; Maham, B ; Ashtiani, F ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2016
Abstract
Frame aggregation (FA) mechanisms improve the throughput of WLANs. In this paper, the effect of the FA mechanism on the throughput of wireless local area networks (WLANs) has been investigated. To this end, we propose an analytical model in order to analyze an IEEE 802.11n network comprised of an access point (AP) and several conventional nodes (CNs), all in the coverage area of each other. With respect to the heavier download traffic compared to the upload one, in our scenario, only the AP uses an FA mechanism and the other nodes use the basic IEEE 802.11 standard. In our proposed analytical model, the maximum downlink (DL) throughput is derived. Regarding the asymmetry among nodes, our...
A novel contention window control scheme for IEEE 802.11 WLANs
, Article IETE Technical Review (Institution of Electronics and Telecommunication Engineers, India) ; Volume 29, Issue 3 , 2012 , Pages 202-212 ; 02564602 (ISSN) ; Movaghar, A ; Jabbehdari, S ; Kanellopoulos, D ; Sharif University of Technology
2012
Abstract
In the IEEE 802.11 standard, network nodes experiencing collisions on the shared medium need a mechanism that can prevent collisions and improve the throughput. Furthermore, a backoff mechanism is used that uniformly selects a random period of time from the contention window (cw) that is dynamically controlled by the Binary Exponential Backoff (BEB) algorithm. Prior research has proved that the BEB scheme suffers from a fairness problem and low throughput, especially under high traffic load. In this paper, we present a new backoff control mechanism that is used with the IEEE 802.11 distributed coordination function (DCF). In particular, we propose a dynamic, deterministic contention window...
On a novel medium access control protocol for wireless ad hoc networks
, Article 3rd International Symposium on Wireless Communication Systems 2006, ISWCS'06, Valencia, 5 September 2006 through 8 September 2006 ; 2006 , Pages 601-604 ; 1424403979 (ISBN); 9781424403974 (ISBN) ; Sharif University of Technology
2006
Abstract
In ad hoc wireless networks, there are scenarios where the desired destination is located in the range of other transmitters, so that the efforts on setting up communication with this terminal will fail due to collisions that may occur between transmitted control frames and undesired received control and data frames. This phenomenon becomes a bottleneck when most of data transmissions experience packet fragmentation. In such scenarios, the desired destination becomes unreachable during the data transfer of neighboring nodes. Using the same PHY of IEEE 802.11 and making slight modifications in its MAC, a new medium access control scheme equipped by a novel transmission scheduling algorithm is...