|
Document Type |
: |
Thesis |
|
Document Title |
: |
a model for mobile multimedia architecture نموذج بناء وسائط متعددة متنقلة |
|
Subject |
: |
Faculty of Computing and Information Technology |
|
Document Language |
: |
Arabic |
|
Abstract |
: |
IEEE 802.11 wireless LAN (WLAN) is one of the most deployed wireless technologies all over the world and is likely to play a major role in next-generation wireless communication networks. The main characteristics of the 802.11 WLAN technology are simplicity, flexibility and cost effectiveness. This technology provides an everywhere communication and computing environment in offices, hospitals, campuses, factories, airports and stock markets. At the same time, multimedia applications have experienced an explosive growth, in the last few years.
People are now requiring receiving high-speed video, audio, voice and Web services even when they are moving in offices or travelling.
However, multimedia applications require some quality of service (QoS) support such as guaranteed bandwidth, delay, jitter and error rate. Guaranteeing those QoS requirements in 802.11 WLAN is very challenging due to the QoS-unaware functions of its medium access control (MAC) layer and the noisy and variable physical (PHY) layer characteristics.
Protocol IEEE 802.11b is one of the WLAN protocols and provides multi-level of rates 1, 2, 5.5 and 11Mbyte per second, the 802.11b WLANs could then reach Ethernet levels of performance, throughput and availability. Thus, the 802.11b multiple data transfer rate capabilities enable wireless network card to adapt their performance to the radio link quality. This characteristic is called dynamic rate shifting. The effect of the dynamic rate shifting in protocol 802.11b WLAN have been studied in this thesis.
Our proposed model is based on disabling the dynamic rate shifting in protocol 802.11b and replace it by the performance enhancing proxy with TCP protocol in Transport layer. The performance of the proposed architecture has been studied and evaluated using the standard simulator NS2. The selected network performance is measured before and after disabling the dynamic rate shifting and using the performance enhancing proxy, and compared.
The proposed model architecture performance exhibits very good with TCP in high error rate for long delay |
|
Supervisor |
: |
Dr. Ahmed Yahya Morsy |
|
Thesis Type |
: |
Master Thesis |
|
Publishing Year |
: |
1430 AH
2009 AD |
|
Added Date |
: |
Wednesday, January 13, 2010 |
|
Researchers
| جمعان علي الزهراني | ALZAHRANI, JAMAN ALI | Researcher | Master | |
|