Performance analysis of enhanced IEEE 802.11 and adaptive 802.11e wireless LANs | |
| Author | Orawan Tipmongkolsilp |
| Call Number | AIT Thesis no.TC-05-5 |
| Subject(s) | IEEE 802.11 (Standard) Wireless LANs |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | The IEEE 802.11 wireless LAN (WLAN) has emerged as one prevailing wireless technology and multimedia applications simultaneously are expected to experience a considerable growth. Unfortunately, while the multimedia applications require some QoS support such as guaranteed bandwidth and bounded delay, 802.11 does not take QoS support into account. Currently IEEE 802.11 Group is working on a new QoS-enhanced standard: IEEE 802.11e. Moreover, many QoS enhancement techniques are proposed to improve the performance of wireless LAN. This thesis studie s and investigates the performance of the original IEEE 802.11 Distributed Coordination Function (DCF) and the upcoming IEEE 802.11e Enhanced DCF (EDCF). Adaptive EDCF (AEDCF) using contention window (CW) adaptive method is also evaluated and applied to DCF (called here Adaptive DCF) and the performance of this new scheme is investigated. Performance evaluation is done by simulating each scheme under different scenarios by varying the traffic conditions and number of stations in the network. Simulation results show that the original IEEE 802.11 DCF cannot handle service differentiation and QoS guarantee for time -bounded application while the upcoming IEEE 802.11e EDCF maintains the throughput of real-time application (audio and video) by degrading the background traffic. Due to CW adaptive technique, AEDCF can maintain lower collision rate at high load than EDCF, which leads to lower audio delay. Moreover, the new scheme Adaptive DCF obtains up to 16% higher total throughput than DCF while keeps the collision rate and audio delay more than 50% and 25% respectively lower than DCF but the audio delay of Adaptive DCF is still high compared to that of EDCF. |
| Year | 2005 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Erke, Tapio J. |
| Examination Committee(s) | Ahmed, Kazi M.;Teerapat Sanguankotchakom |
| Scholarship Donor(s) | TOT Corporation Public Company Limited |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |