Modified Backoff Algorithm considering Priority in IEEE 802.11
نویسندگان
چکیده
The IEEE 802.11 MAC uses DCF for media access among the participating network nodes. But DCF alone is neither capable nor suitable for fulfilling the QoS requirements of real-time applications. There are many ways in which QoS is provided by modifying DCF based MAC. This paper proposes the modified MAC protocol which is based on IEEE 802.11 and (m,k)-firm scheme tries to improve DCF functionality. The proposed scheme uses different contention window according to the number of collision in the node. The simulation result shows that the proposed scheme helps improve the throughput of the DCF.
منابع مشابه
Adaptive Backoff Algorithm for IEEE 802.11 MAC Protocol
A Mobile Ad Hoc Network (MANET) is a collection of mobile nodes that can communicate directly over wireless media, without the need for a pre-configured infrastructure. Several approaches have been suggested to improve Quality of Service (QoS) in IEEE 802.11-based MANETs through modifying some of the IEEE 802.11 Medium Access Control (MAC) algorithms, such as the backoff algorithm that is used ...
متن کاملDelay Analysis of IEEE 802.11 DCF with modified Binary Exponential Backoff
In the design of wireless networks the medium access control (MAC) protocols have a very high impact on the performance of the network. The IEEE 802.11 is widely accepted technology for the Wireless LANs has been used by wireless networks. Delay is one of the important parameter to measure the performance of the wireless networks. We give a delay analysis of the Distributed Coordination Functio...
متن کاملAn Analysis of the Modified Backoff Mechanism for Ieee 802.11 Networks
This paper describes a modification of the backoff mechanism for IEEE 802.11 networks. The efficiency of the modified backoff mechanism compared to that is currently used in the standard was analyzed. The realized throughput and the mean packet delay for DSSS and FHSS physical layers for different number of stations were determined. The overall rate of collisions that occurred during transmissi...
متن کاملDesign and Performance Evaluation of an Asymptotically Optimal Backoff Algorithm for IEEE 802.11 Wireless LANs
This paper presents and evaluates a distributed mechanism for the contention control in IEEE 802.11 Wireless LANs. Specifically, our mechanism named Asymptotically Optimal Backoff (AOB), dynamically adapts the backoff window size to the current load. AOB guarantees that an IEEE 802.11 WLAN asymptotically (i.e. for a large number of active stations) achieves its optimal channel utilization. The ...
متن کاملOn Improving Performance for IEEE 802.11 Wireless LANs under Congested and Error-Prone Environments
IEEE 802.11 is worldwide implemented and the most widely deployed protocol for Wireless Local Area Networks (WLANs). This paper proposes a simple and effective contention window-resetting scheme, named Double Increment Double Decrement (DIDD), to improve the performance of IEEE 802.11 Binary Exponential Backoff (BEB) under an error-prone environment. Our work becomes important and meaningful in...
متن کامل