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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