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Steiner Systems for Topology-Transparent Access Control in MANETs 251Table 2. Steiner system S(2, 4, 13).00001112233451246257364789385a46b57689a9c7ba8cb9cabcgiven number of nodes and a given maximum number of neighbours, Steinersystems achieve the shortest frame length of all cover-free families. Thus, theyprovide not only a solution to our problem, but indeed the best solution in termsof frame length.Definition 2. Given three integers t, k, v such that 2 ≤ t
252 C.J. Colbourn, V.R. Syrotiuk, and A.C.H. LingIntuitively, while Chlamtac and Faragó [2] strive to get one free slot per frame,Ju and Li [10] aim to get many free slots per frame.In both studies, however, the figure of merit is minimum throughput measuredas number of free slots within a frame divided by frame length. To employsuch an analysis, a transmitting node must be able to transmit multiple differentpackets within a frame. How does it decide to transmit a “new” packet? Inthis environment, it is expected that collisions occur, and topology-transparencydictates that the collisions cannot be anticipated. Hence an acknowledgementscheme is needed. Both schemes based on orthogonal arrays can transmit in twoconsecutive slots, and indeed must send different packets in these slots to achievethe minimum throughput in their analyses. Both propose an acknowledgementscheme that involves instantaneous acknowledgment of successful receipt withoutlengthening the slot. Naturally, this is an optimistic assumption to facilitatethe analysis. However, the analysis can be misleading if it leads us to seek manyfree slots in a frame without an acceptable (realistic) acknowledgment scheme.For purposes of comparison, we consider the throughput measures employed in[2,10,16]. We also adopt a more conservative approach.We consider a more realistic model for acknowledgements. Rather than a slotby slot acknowledgement, we assume we can piggyback an acknowledgement ontoa packet sent from the destination. In the worst case, this might require that thesender wait an entire frame. Hence we define frame throughput as the throughputachievable on a per frame basis. This properly incorporates the length of theschedule in the throughput calculation.In this section we investigate three questions:1. What is the probability of a successful transmission in a frame?2. What is the expected throughput?3. What is the expected frame throughput?All are functions of the number of active transmitters among the neighboursof a node.Consider a situation with sender S and receiver R. Let S be a schedulefor sender S and T 1 ,...,T D−1 be the subsets that correspond to the schedulesof the other active neighbours of R (here, we assume the worst case, when allneighbours are transmitting). Let T D be the subset corresponding to the schedulefor R, and assume that R is also active.The probability of successful transmission within a frame is just the probabilitythat S has a slot that does not appear in T 1 ,...,T D . Expected throughputthen, is the expected number of such slots. The frame throughput is the expectednumber of slots over the frame length. This effectively normalizes the expectedthroughput by frame length allowing easier comparison between Steiner systems.We derive these measures analytically but present the derivations elsewhere.The most complex derivation is for expected throughput. We did this for schedulesthat correspond to orthogonal arrays in [16]. This formulation may be usedas a basis to derive expected throughput for schedules that correspond to Steinersystems.
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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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20 J. Doshi and P. Kilambi5 Simulat
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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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32 P. Narayan and V.R. Syrotiukenti
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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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66 Y. Ge, T. Kunz, and L. Lamonttha
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68 Y. Ge, T. Kunz, and L. Lamontwhi
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70 Y. Ge, T. Kunz, and L. Lamontver
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Delivering Messagesin Disconnected
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74 R. Shah and N.C. Hutchinson3.1 T
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78 R. Shah and N.C. HutchinsonTable
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Extending Seamless IP Multicast Edg
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86 P.M. Ruiz et al.Section 4 presen
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88 P.M. Ruiz et al.Access NetworkCo
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92 P.M. Ruiz et al.MIGAccess Networ
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94 P.M. Ruiz et al.10.90.81-hop-750
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A Uniform Continuum Model for Scali
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98 E.W. Grundke and A.N. Zincir-Hey
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100 E.W. Grundke and A.N. Zincir-He
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102 E.W. Grundke and A.N. Zincir-He
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Probabilistic Protocols for Node Di
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106 G. Alonso et al.A node discover
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108 G. Alonso et al.frequency alloc
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110 G. Alonso et al.- D is a diagon
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112 G. Alonso et al.and therefore,
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114 G. Alonso et al.complicated. Fo
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Towards Adaptive WLAN Frequency Man
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118 F. Gamba, J.-F. Wagen, and D. R
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Analyzing Split Channel Medium Acce
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130 J. Deng, Y.S. Han, and Z.J. Haa
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Preventing Replay Attacks for Secur
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142 J. Zhen and S. SrinivasTraffic
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144 J. Zhen and S. SrinivasFig. 2.
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146 J. Zhen and S. Srinivasbeginnin
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152 M. Just, E. Kranakis, and T. Wa
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A New Framework for Building Secure
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166 H.-P. Bischof, A. Kaminsky, and
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176 G. Calinescuof the UDG 2-hops a
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178 G. CalinescuSection 3 describe
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180 G. CalinescuWhen receiving a pa
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182 G. CalinescuRyvxFig. 3. The unn
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184 G. Calinescu< nodeID, pieceID,
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186 G. Calinescu7. Heinz Breu and D
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188 S.O. Krumke et al.desirable in
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190 S.O. Krumke et al.2.2 Bicriteri
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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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Table of ContentsSpace-Time Routing
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Author IndexAlonso, G. 104Bachir, A
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