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Mobile Intelligence by Bala Srinivasan, Ling Tan, Jianhua Ma, Agustinus Borgy Waluyo, Laurence T. Yang

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7.3 PERFORMANCE ANALYSIS

A discrete-event simulator is conducted to evaluate the performance of the proposed KCLS protocol. The multihop wireless network used in the simulation has N homogeneous mobile nodes, which are randomly distributed in the area with S = 30 × 30 square units. All mobile nodes have the same radio transmission range with a radius r = 1 unit. The connection arrival rate for each node is assumed to be Poisson distributed with a mean value of λCall. The mobility model deployed in the simulations is the random walk model [32, 33], in which the node moving velocity is changed only at the beginning of each node-moving epoch. The moving rate and direction of a node within an epoch are constant, following uniform distribution among predefined ranges [0, Vm] and [0,2π], respectively, where Vm is the maximum rate of node moving. All clusters are created and maintained by the KCMBC approach [19]. The parameters used in the simulation are illustrated in Table 7.4.

Table 7.4 Simulation Parameters for Location Service Protocol

Items Value
Total number of nodes, N 1000–4000
Maximum moving rate, Vm 0.2–1 unit/s
Time interval of node moving epoch, τe 1 s
Mean connection arrival rate, λcall 1/420 s
Scaling factor, σ 0.1–0.5
Time interval for measuring link available time, TSLOT 10 s
Distance threshold, Dth 2 units

The simulation is independently repeated 10 times. In each simulation run, 50,000 random connection requests are generated excluding a warm-up ...

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