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                           <rdf:li><rdf:Description xmpDM:name="Aloha/slotted aloha Mechanism random, distributed (no central arbiter), time-multiplex Slotted Aloha additionally uses time-slots, sending must always start at slot" xmpDM:startTime="0" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="boundaries Aloha Slotted Aloha Prof." xmpDM:startTime="0" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="0" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="0" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="0" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications sender A sender B sender C collision sender A sender B sender C collision t t" xmpDM:startTime="0" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="DAMA - Demand Assigned Multiple Access Channel efficiency only 18% for Aloha, 36% for Slotted Aloha assuming Poisson distribution for" xmpDM:startTime="440833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="packet arrival and packet length Reservation can increase efficiency to 80% a sender reserves a future time-slot sending within this" xmpDM:startTime="440833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="reserved time-slot is possible without collision reservation also causes higher delays typical scheme for satellite links Examples for reservation algorithms:" xmpDM:startTime="440833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Explicit Reservation according to Roberts (Reservation-ALOHA) Implicit Reservation (PRMA) Reservation-TDMA Prof." xmpDM:startTime="440833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="440833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="440833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="440833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications" xmpDM:startTime="440833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Access method DAMA: Explicit Reservation Explicit Reservation (Reservation Aloha): two modes: ALOHA mode for reservation: competition for small reservation slots," xmpDM:startTime="732567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="collisions possible reserved mode for data transmission within successful reserved slots (no collisions possible) it is important for all stations" xmpDM:startTime="732567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="to keep the reservation list consistent at any point in time and, therefore, all stations have to synchronize from time" xmpDM:startTime="732567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="to time Prof." xmpDM:startTime="732567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="732567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="732567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="732567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications Aloha reserved Aloha reserved Aloha reserved Aloha collision t" xmpDM:startTime="732567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Access method DAMA: PRMA Implicit reservation (PRMA - Packet Reservation MA): a certain number of slots form a frame, frames" xmpDM:startTime="992133" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="are repeated stations compete for empty slots according to the slotted aloha principle once a station reserves a slot successfully," xmpDM:startTime="992133" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="this slot is automatically assigned to this station in all following frames as long as the station has data to" xmpDM:startTime="992133" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="send competition for this slots starts again as soon as the slot was empty in the last frame Prof." xmpDM:startTime="992133" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="992133" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="992133" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="992133" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications frame1 frame2 frame3 frame4 frame5 1 2 3 4 5 6 7 8 time-slot collision at reservation attempts" xmpDM:startTime="992133" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="A C D A B A F A C A B A A B A F A B A F" xmpDM:startTime="992133" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="D A C E E B A F D t ACDABA-F ACDABA-F AC-ABAF- A---BAFD ACEEBAFD reservation" xmpDM:startTime="992133" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Access method DAMA: Reservation-TDMA Reservation Time Division Multiple Access every frame consists of N mini-slots and x data-slots every station" xmpDM:startTime="1414000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="has its own mini-slot and can reserve up to k data-slots using this mini-slot (i.e." xmpDM:startTime="1414000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="x = N * k)." xmpDM:startTime="1414000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="other stations can send data in unused data-slots according to a round-robin sending scheme (best-effort traffic) Prof." xmpDM:startTime="1414000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="1414000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="1414000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="1414000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications N mini-slots N * k data-slots reservations for data-slots other stations can use free data-slots based on a" xmpDM:startTime="1414000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="round-robin scheme e.g." xmpDM:startTime="1414000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="N=6, k=2" xmpDM:startTime="1414000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="MACA - collision avoidance MACA (Multiple Access with Collision Avoidance) uses short signaling packets for collision avoidance RTS (request to" xmpDM:startTime="1643233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="send): a sender request the right to send from a receiver with a short RTS packet before it sends a" xmpDM:startTime="1643233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="data packet CTS (clear to send): the receiver grants the right to send as soon as it is ready to" xmpDM:startTime="1643233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="receive Signaling packets contain sender address receiver address packet size Variants of this method can be found in IEEE802.11" xmpDM:startTime="1643233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="as DFWMAC (Distributed Foundation Wireless MAC) Prof." xmpDM:startTime="1643233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="1643233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="1643233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="1643233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications" xmpDM:startTime="1643233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="MACA examples MACA avoids the problem of hidden terminals A and C want to send to B A sends RTS" xmpDM:startTime="1820000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="first C waits after receiving CTS from B MACA avoids the problem of exposed terminals B wants to send to" xmpDM:startTime="1820000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="A, C to another terminal now C does not have to wait for it, cannot receive CTS from A Prof." xmpDM:startTime="1820000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="1820000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="1820000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="1820000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications A B C RTS CTS CTS A B C RTS CTS RTS" xmpDM:startTime="1820000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Polling mechanisms If one terminal can be heard by all others, this “central” terminal (a.k.a." xmpDM:startTime="2211800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="base station) can poll all other terminals according to a certain scheme now all schemes known from fixed networks can" xmpDM:startTime="2211800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="be used (typical mainframe - terminal scenario) Example: Randomly Addressed Polling base station signals readiness to all mobile terminals terminals" xmpDM:startTime="2211800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="ready to send can now transmit a random number without collision with the help of CDMA or FDMA (the random" xmpDM:startTime="2211800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="number can be seen as dynamic address) the base station now chooses one address for polling from the list of" xmpDM:startTime="2211800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="all random numbers (collision if two terminals choose the same address) the base station acknowledges correct packets and continues polling" xmpDM:startTime="2211800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="the next terminal this cycle starts again after polling all terminals of the list Prof." xmpDM:startTime="2211800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="2211800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="2211800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="2211800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications" xmpDM:startTime="2211800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="ISMA (Inhibit Sense Multiple Access) Current state of the medium is signaled via a “busy tone” the base station signals" xmpDM:startTime="2366667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="on the downlink (base station to terminals) if the medium is free or not terminals must not send if the" xmpDM:startTime="2366667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="medium is busy terminals can access the medium as soon as the busy tone stops the base station signals collisions" xmpDM:startTime="2366667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="and successful transmissions via the busy tone and acknowledgements, respectively (media access is not coordinated within this approach) classical mechanism" xmpDM:startTime="2366667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="used, e.g.," xmpDM:startTime="2366667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="for CDPD (USA, integrated into AMPS) Prof." xmpDM:startTime="2366667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="2366667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="2366667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="2366667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications" xmpDM:startTime="2366667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Questions &amp; Tasks Recall the problem of hidden and exposed terminals." xmpDM:startTime="2481200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="What happens in the case of such terminals if Aloha, slotted Aloha, reservation Aloha, or MACA is used? What are" xmpDM:startTime="2481200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="the advantages of a fixed TDM pattern compared to random, demand driven TDM? Compare the efficiency in the case of" xmpDM:startTime="2481200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="several connections with fixed data rates or in the case of varying data rates." xmpDM:startTime="2481200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Now explain why traditional mobile phone systems use fixed patterns, while computer networks generally use random patterns." xmpDM:startTime="2481200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="The major part of data being transmitted is computer-generated data." xmpDM:startTime="2481200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="How has this fact changed mobile phone systems? What are benefits of reservation schemes? 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Think of mobile stations and changing transmission characteristics." xmpDM:startTime="2481200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Prof." xmpDM:startTime="2481200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="2481200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="2481200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="2481200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications" xmpDM:startTime="2481200" xmpDM:duration="1000"/></rdf:li></rdf:Seq>
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                           <rdf:li><rdf:Description xmpDM:name="Aloha/slotted aloha Example" xmpDM:startTime="0" tscDM:image="C03_Medium_Access-2_Thumbnails.png" tscDM:imageindex="0" tscDM:imageoffset="0" tscDM:imagerect="0, 0, 75, 42"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Aloha/slotted aloha" xmpDM:startTime="113300" tscDM:image="C03_Medium_Access-2_Thumbnails.png" tscDM:imageindex="1" tscDM:imageoffset="0" tscDM:imagerect="75, 0, 75, 42"/></rdf:li><rdf:li><rdf:Description xmpDM:name="DAMA - Demand Assigned Multiple Access" xmpDM:startTime="440833" tscDM:image="C03_Medium_Access-2_Thumbnails.png" tscDM:imageindex="2" tscDM:imageoffset="0" tscDM:imagerect="150, 0, 75, 42"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Access method DAMA: Explicit Reservation" xmpDM:startTime="732567" tscDM:image="C03_Medium_Access-2_Thumbnails.png" tscDM:imageindex="3" tscDM:imageoffset="0" tscDM:imagerect="225, 0, 75, 42"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Access method DAMA: PRMA" xmpDM:startTime="992133" tscDM:image="C03_Medium_Access-2_Thumbnails.png" tscDM:imageindex="4" tscDM:imageoffset="0" tscDM:imagerect="300, 0, 75, 42"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Access method DAMA: Reservation-TDMA" xmpDM:startTime="1414000" tscDM:image="C03_Medium_Access-2_Thumbnails.png" tscDM:imageindex="5" tscDM:imageoffset="0" tscDM:imagerect="375, 0, 75, 42"/></rdf:li><rdf:li><rdf:Description xmpDM:name="MACA - collision avoidance" xmpDM:startTime="1643233" tscDM:image="C03_Medium_Access-2_Thumbnails.png" tscDM:imageindex="6" tscDM:imageoffset="0" tscDM:imagerect="450, 0, 75, 42"/></rdf:li><rdf:li><rdf:Description xmpDM:name="MACA examples" xmpDM:startTime="1820000" tscDM:image="C03_Medium_Access-2_Thumbnails.png" tscDM:imageindex="7" tscDM:imageoffset="0" tscDM:imagerect="525, 0, 75, 42"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Polling mechanisms" xmpDM:startTime="2211800" tscDM:image="C03_Medium_Access-2_Thumbnails.png" tscDM:imageindex="8" tscDM:imageoffset="0" tscDM:imagerect="600, 0, 75, 42"/></rdf:li><rdf:li><rdf:Description xmpDM:name="ISMA (Inhibit Sense Multiple Access)" xmpDM:startTime="2366667" tscDM:image="C03_Medium_Access-2_Thumbnails.png" tscDM:imageindex="9" tscDM:imageoffset="0" tscDM:imagerect="675, 0, 75, 42"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Questions &amp; Tasks" xmpDM:startTime="2481200" tscDM:image="C03_Medium_Access-2_Thumbnails.png" tscDM:imageindex="10" tscDM:imageoffset="0" tscDM:imagerect="750, 0, 75, 42"/></rdf:li></rdf:Seq>
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