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There are real challenges in both the IEEE 802.11 wireless local area network (WLAN) protocol and the medium access control (MAC)-functions providing the required quality-of-service, high throughput and minimum latencies. The IEEE 802.11 layer supports both the distributed coordination function (DCF) and the enhanced DCF (EDCF). The different access categories (AC) within the EDCF can enhance the...
The MAC protocol is important, especially for wireless LAN because of limited bandwidth. A great deal of research has been carried out and some of proposed schemes are effective. Specifically, considerable effort has been devoted to improving the IEEE 802.11 standard which is utilized widely. Previous theoretical analysis gave the upper bound of IEEE 802.11 DCF throughput which is far below the channel...
IEEE 802.11 Wireless Local Area Network (WLAN) is one of the most widely deployed wireless network technologies in the world today. However, 802.11 MAC algorithm is unable to support modern multimedia applications which require certain level of quality of service (QoS) guarantees in terms of consistent, timely and reliable data transfer. The 802.11e MAC protocol provides extension for adjustment of...
The IEEE 802.11b/g based wireless LANs (WLANs) are widely deployed across enterprise and home segments. The new IEEE 802.11n amendment aims at providing data rates up to 600 Mbps with better quality of service (QoS) and backward compatibility with all the legacy (IEEE 802.11a/b/g) devices. These legacy devices cannot decode 802.11n transmissions and hence all the 802.11n transmissions must follow...
As wireless local area networks (WLAN) become ubiquitous and an integral part of data networks, they will also be increasingly used for applications ranging from standard Internet services like ftp to time bound multimedia applications, such as Voice (or Video) over IP (VoIP/VIP), HDTV etc. with strict latency, throughput or jitter restrictions. These applications on WLAN will also be more bandwidth...
In current trends, the central target of interest for multimedia applications is to meet the stringent quality of service (QoS) requirements for traffic flow over contention based MAC protocol of IEEE 802.11 WLAN. To achieve this objective, our paper proposes a connection admission control (CAC) policy, which attempts to maintain the flow of incoming traffic in the wireless network so as to effectively...
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