mobility management Mobility management is one of the major functions of a GSM or a UMTS network that allows mobile phones to work. The aim of mobility management is to track where the subscribers are, allowing calls, SMS and other mobile phone services to be del ...

, the random waypoint model is a random model for the movement of mobile users, and how their location, velocity and acceleration change over time.

Mobility model Mobility models characterize the movements of mobile users with respect to their location, velocity and direction over a period of time. These models play an vital role in the design of Mobile Ad Hoc Networks(MANET). Most of the times simulators ...

s are used for simulation purposes when new network protocols are evaluated. The random waypoint model was first proposed by Johnson and Maltz. It is one of the most popular mobility models to evaluate

mobile ad hoc network A wireless ad hoc network (WANET) or mobile ad hoc network (MANET) is a decentralized type of wireless network. The network is ad hoc because it does not rely on a pre-existing infrastructure, such as routers in wired networks or access points ...

(MANET) routing protocols, because of its simplicity and wide availability. In random-based mobility simulation models, the mobile nodes move randomly and freely without restrictions. To be more specific, the destination, speed and direction are all chosen randomly and independently of other nodes. This kind of model has been used in many simulation studies. Two variants, the

random walk In mathematics, a random walk is a random process that describes a path that consists of a succession of random steps on some mathematical space. An elementary example of a random walk is the random walk on the integer number line \mathbb ...

model and the random direction model are variants of the random waypoint model.

Description of model

The movement of nodes is governed in the following manner: Each node begins by pausing for a fixed number of seconds. The node then selects a random destination in the simulation area and a random speed between 0 (excluded) and some maximum speed. The node moves to this destination and again pauses for a fixed period before another random location and speed. This behaviour is repeated for the length of the simulation. Simulation of model
BonnMotion
is one of the tool to generate mobility scenarios based on random waypoint model and many other mobility models including

model, random direction model, etc.

Orientation-based Random Waypoint

In the context of mmWave communication, optical wireless communication, and Terahertz networks, the orientation of a device is also important (in contrast to the radio frequency networks). Therefore, it is essential to incorporate the orientation of the device with the mobility model. This concept was first introduced in the paper entitled "Modeling the Random Orientation of Mobile Devices: Measurement, Analysis and LiFi Use Case".

Notes

References

* GSM standard Wireless networking {{wireless-stub