Jost Weinmiller

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1 Currently two projects are on their way to standardize physical layer and medium access control for wireless LANs-IEEE 802.11 and ETSI RES10 Hiperlan. This paper presents an introduction to both projects focussing on the applied access schemes. Fyrther we will present our simulation results, analyzing the performance of both access protocols depending on(More)
The upcoming standard for wireless LANs-DFWMAC 1 developed by the IEEE 2 802.11 working group consists of two parts-the distributed coordination function DCF that is based on a contention scheme and the point coordination function PCF based on a contention free scheme. The DCF is CSMA/CA like access protocol with several extensions. In this paper, following(More)
The distributed coordination function (DCF) in the upcoming standard for wireless LANs IEEE 802.11 is based on a CSMA/CA like access protocol. The collision avoidance part applies a rotating backoff window mechanism, that causes unequal collision probability distribution depending on the position of the selected slot within the contention window. We present(More)
1 The MAC-part of the upcoming IEEE 802.11 standard for wireless LANs-named DFWMAC 2 is based on a CSMA/CA-type access protocol with a rotating backoo window and an optional RTS/CTS message exchange. In this paper, following a short presentation of DFWMAC we will present the results of our simulative analysis of DFWMAC focussing on analysis and improvements(More)
The distributed coordination function that is used as the access scheme for asyn-chronous traffic within the upcoming standard for wireless LANs IEEE 802.11 optionally applies the RTS/CTS message exchange to solve the 'hidden terminal' scenario. In this paper, following a general discussion of the mechanism and its problems, we show the effectiveness or(More)
1 2 This paper presents a solution to interconnect wireless cells to reach common LAN-dimensions. The protocol uses multicast to support fast handover in the presence of mobility in a local environment. The approach is strictly connectionless. A performance evaluation points out the benefits gained by using the multicast and estimates the drawbacks induced(More)
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