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The network throughput will decrease dramatically and collision rate increases severely when active nodes increase in WLAN. Breaking through the limitation of the Binary Exponential Backoff algorithms, we provide a new backoff algorithm which utilizes the linear contention window based on the node numbers. To attain better performance, we derive that the contention window is selected as an approximate...
IEEE 802.11 wireless LANs have been growing increasingly in recent years. In parallel with this, it is now easier for users to connect to access points (APs) which are commonly used. In IEEE 802.11 WLANs, a station can associate with more than one access point (AP). Previous algorithms which consider only the received signal strength indicator (RSSI) can cause stations to be associated to a single...
The enhanced distributed channel access (EDCA) mechanism of the IEEE 802.11e standard provides quality-of-service (QoS) support through service differentiation by using different medium-access-control (MAC) parameters for different stations. The configuration of these parameters, however, is still an open research challenge, as the standard provides only a set of fixed recommended values that do not...
This paper first described the IEEE 802.11 MAC layer access control mechanism, that is, the DCF access control mechanism, analysis the basic DCF back-off algorithm BEB. Next, we study a variety of improved BEB algorithms, and then we proposed ZDCF back-off algorithm which is an exponential-based half back-off algorithm. ZDCF is flexible, easy to implement and has excellent performance as BEB algorithms...
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