New PDF release: New trends in computer networks

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By T. Tugcu, et al.,

ISBN-10: 1860946119

ISBN-13: 9781860946110

ISBN-10: 1860947301

ISBN-13: 9781860947308

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37 It should be noted that in irregular mesh topologies for 106 of 202 tested traffic demands the FD algorithm was not able to find a feasible solution for hl=O. Thus, on Fig. 2 and Fig. 3 we show aggregate results for hop-limit values 1-5 and 36. -* 40000 2 e, 5 30000 0 g 20000 10000 0 82 83 84 85 86 87 88 89 bandwidth requirement 90 91 92 Figure 4. The LFL as a hnction of bandwidth requirement for various hop limit values obtained for network 128. Fig. 4 plots the relative performance of LFL function for increasing traffic load in network 128.

3 Definition of Functions for Link Restoration A network (G, c ) is given, where G = ( V ,A ) is a directed graph with n vertices and m arcs, c : A +'R is a function that defines capacities of the arcs. We denote by o : A -+V and d : A + V functions defining the origin and destination node of each arc. For each a E A we call in(a) = {k E A I d ( k ) = d(a),k + a } the set of incoming arcs of d(a) except a, and out(a) = {k E A 1 o(k) = o(a),k z a ) the set of outgoing arcs of o(a) except a. We introduce the following further notations Represents the total flow on arc a.

In addition, owing t o its reflection on channel state, the scheduler induces some variation on scheduling delay. So, PF scheduler can make a serious influence on the performance of TCP since it uses path delay or round trip time (RTT) t o estimate network state. Previous researches * have already addressed the issue of TCP performance in cellular networks. However, to our best knowledge, it is not investigated how the opportunistic scheduler like PF one affects the behavior of TCP. In this paper, we focus on the impact of PF scheduler on TCP excluding other reasons such as handoff, packet error, and so on.

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New trends in computer networks by T. Tugcu, et al.,


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