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Analyzing Split Channel Medium Access Control Schemes 131and the radio propagation delays are negligible and that the traffic generated byactive nodes (including retransmissions) is Poisson with rate λ.We establish the following notation:– L c , L d : the length of a control packet and that of a data packet, respectively– k: the ratio of data packet length to the control packet length; i.e., k = L dL c– R, R c , and R d : the data rate of the entire shared channel, the control subchannel,and the data subchannel, respectively; i.e., R = R c + R d– r: the ratio of the data rate of the control subchannel to the data rate of theentire channel in the MAC-2 and the MAC-2R schemes; i.e., r = RcR = RcR c+R d– γ 1 , δ 1 : the transmission time of a control packet and the transmission timeof a data packet in the MAC-1 scheme, respectively; i.e., γ 1 = LcR and δ 1 =L dR= kγ 1– γ 2 , δ 2 : the transmission time of a control packet and the transmission timeof a data packet, respectively, in the MAC-2 or the MAC-2R schemes; i.e.,γ 2 = LcR c= γ1rand δ 2 = L dR d= kγ11−r– δ: normalized data packet transmission time in the MAC-2 and the MAC-2Rschemes; i.e., δ = δ2γ 2= kr1−r .3.2 Comparing the Throughput of the MAC-1and the MAC-2 SchemesFig. 1 depicts an example of the operations of the MAC-1, the MAC-2, andthe MAC-2R schemes. We treat the packet transmission on the channel as arenewal process. To send a data packet successfully, two control packets and adata packet need to be transmitted on the shared channel after the contentionresolution period, which is the time between the end of the previous successfuldata transmission and the beginning of current successful RTS/CTS dialogue.According to [11], the expected value of the normalized contention resolutionperiod in ALOHA channels (w) is a constant, when normalized Poisson trafficarrival rate is fixed. In the MAC-1 scheme, the expected time of a data packettransmission cycle is:t 1 = wγ 1 +2γ 1 + δ 1 =(w +2+k) · γ 1 .Thus, according to the property of renewal processes, the throughput of theMAC-1 scheme can be expressed asS 1 = δ 1= kγ 1 k=t 1 t 1 w +2+k . (1)In the MAC-2 scheme, the available bandwidth is split into two subchannels.Channel requests can only be transmitted after the current data transmissionends. The throughput of the MAC-2 scheme is a function of r. The expectedtime of a renewal cycle is( w +2t 2 = w · γ 2 +2· γ 2 + δ 2 =r+ k )· γ 1 .1 − r
132 J. Deng, Y.S. Han, and Z.J. HaasMAC−1Contention Resolution ½ ½ Æ ½RTS CTS DATAÛ ½ ¾MAC−2Û ¾Contention Resolution ¾RTS ¾CTSÆ ¾DATAMAC−2RÛ ¾Æ ¾Contention ResolutionDATA ¾ ¾ ¾RTS CTS ¡¡¡ RTS CTSÆ ¾DATAFig. 1. Comparison of MAC-1, MAC-2, and MAC-2RTherefore, the throughput of the MAC-2 scheme isS 2 (r) = δ 2t 2· (1 − r) =kw+2r+ k1−r, (2)where the term 1 − r in the first equation represents the portion of the entireavailable bandwidth of the shared channel that is used as the data subchannel.Comparing (1) and (2), we conclude that S 2 (r)
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Lecture Notes in Computer Science 2
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Samuel Pierre Michel BarbeauEvangel
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PrefaceAd Hoc Networks are wireless
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Program CommitteeG. Alonso, ETHZ, S
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XTable of ContentsResisting Malicio
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2 H. Dubois-Ferrière, M. Grossglau
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10 H. Dubois-Ferrière, M. Grossgla
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SAFAR: An Adaptive Bandwidth-Effici
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14 J. Doshi and P. Kilambiour proto
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16 J. Doshi and P. Kilambipacket th
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18 J. Doshi and P. Kilambibandwidth
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22 J. Doshi and P. Kilambiquery its
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24 J. Doshi and P. Kilambi4. David
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26 P. Narayan and V.R. SyrotiukThe
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28 P. Narayan and V.R. Syrotiuk2.2
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30 P. Narayan and V.R. Syrotiukrand
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34 P. Narayan and V.R. SyrotiukDSRA
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36 P. Narayan and V.R. Syrotiuk7. A
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38 L. Qin and T. Kunzthese two prot
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40 L. Qin and T. Kunzsidered broken
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42 L. Qin and T. KunzP = Prdlog( )
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46 L. Qin and T. KunzFig. 5. Averag
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48 L. Qin and T. Kunz6. J. Broch et
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50 M. Diha and S. Pierrethe propose
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52 M. Diha and S. Pierre3. All proc
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54 M. Diha and S. Pierre3.3 Perform
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56 M. Diha and S. PierreCmip/Cprop0
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58 M. Diha and S. PierreThe tunneli
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Proactive QoS Routing in Ad Hoc Net
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62 Y. Ge, T. Kunz, and L. LamontFig
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64 Y. Ge, T. Kunz, and L. Lamontits
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Delivering Messagesin Disconnected
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74 R. Shah and N.C. Hutchinson3.1 T
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76 R. Shah and N.C. Hutchinsonset c
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78 R. Shah and N.C. HutchinsonTable
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188 S.O. Krumke et al.desirable in
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192 S.O. Krumke et al.1. From the g
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194 S.O. Krumke et al.The following
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196 S.O. Krumke et al.1. Let α =6l
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198 S.O. Krumke et al.for any given
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208 S. PatilTable 1. Probability of
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3BerlinHeidelbergNew YorkHong KongL
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Series EditorsGerhard Goos, Karlsru
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Organizing CommitteeConference Co-c
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Table of ContentsSpace-Time Routing
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Author IndexAlonso, G. 104Bachir, A
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