[PDF] Top 20 Performance Improvement of 802.11 MAC by enhancements in DCF

... Before transmitting a packet, a station operating in RTS/CTS mode “reserves” the channel by sending a special Request-To-Send short frame. The destination station acknowledges the receipt of an RTS frame by sending back ... See full document

... modeling performance aspects of the IEEE ...of performance for particular applications [12], but have not attempted to model throughput and delay in analytical ...a MAC protocol that mimics the IEEE ... See full document

... (PHY) layer specification for WLANs. WLANs can operate in two modes namely infrastructure based and infrastructure-less mode or ad-hoc mode. In infrastructure based mode, a central coordinator or an Access Point (AP) is ... See full document

... the MAC protocol; ii) only “best-effort” ser- vice was supported, thus preventing any sort of traffic differentiation that could improve the performance of multimedia applications, which as compared to data ... See full document

... networks, MAC overhead such as channel idle time and packet collisions becomes a serious factor degrading the system ...802.11 DCF, as well as the “random channel” scheme where each node randomly chooses a ... See full document

... In recent years there has been an increasing trend towards personal computers and workstations becoming portable and mobile. People need the same service quality as in wired network. Future demands support of voice and ... See full document

... the MAC protocol: the point coordination function (PCF) and the distributed coord- ination function ...the DCF utilizes an access mechanism that supports contention-based ...The DCF access mechanism ... See full document

... In this section, detailed description as how the traditional IEEE 802.11 PCF protocol can be modified to achieve a better performance is given. The original IEEE 802.11 is analyzed to show that PCF is not suitable ... See full document

... the DCF (Distributed Coordination Function) version of the CSMA / CA protocol gives good performance in terms of packet delivery ratio, RTS/ Frame, Mean ...Wirless MAC layer traffic and so far it has ... See full document

... hand, DCF has become the preferred MAC function due to ...the performance of DCF as regards throughput [9, 10], delay [11] and quality of service [12, ... See full document

... 10, 11] have attempted to improve IEEE 802.11 performance by either modifying the backoff mechanism or by fine-tuning certain protocol ...capacity improvement that is achieved when CW increases but ... See full document

... the MAC protocol of IEEE 802.11 Distributed Coordinate Function (DCF) is designed for sharing a single channel between ...a MAC protocol that exploits multiple channels is not an easy problem, due to ... See full document

... In our simulations, we did not consider the impact of traffic pattern on the performance of rate adaptation algorithms, which leaves as our future work. The results presented in the thesis demonstrate that ... See full document

... Point Coordination Function (PCF) of the guard nodes are modified at the MAC layer according to the pro- posed model. This technique is used to coordinate the communication within the network. The PCF mechanism ... See full document

... In this paper, the ELFGCP algorithm is proposed for CAC, and two additional thresholds, BPT and DPT, are defined for the purpose of evaluating resource utiliza- tion. New calls and handoff calls are correlatively treated ... See full document

... Jurcik[4] addresses the performance evaluation of IEEE 802.15.4 GTS (Guaranteed Time Slot) mechanism, and it is a research effort aiming at assessing IEEE 802.15.4/ZigBee protocol as a candidate technology within ... See full document

... The use o f coated cutting tools to machine vari­ ous materials now represents state-of-the-art tech­ nology. Developments in coating equipment and proc­ esses now enable us to produce a wide range o f dif­ ferent hard ... See full document

... We compare DCW with other algorithms to verify that the DCW is able to provide a relatively close approxi- mation to the maximum throughput. In order to show the differences in IEEE 802.11 + [4] and DCW, the scale for ... See full document

... network. Here, we also compare this new security protocol to exiting security protocols in wireless local area network. This paper is organized as follows. Section 2 points out strengths and weakness of existing security ... See full document

... a MAC layer handoff. For the discovery, STAs perform active scanning by broadcasting a special management frame, that is, Probe Request, to every channel supported by their NIC. An STA triggers the active scanning ... See full document