Wireless network access usage models

There are couple different usage models for wireless networks: For laptops and some other devices, the user moves to a location such as a coffee shop or colloquy room, sets up the device, and afterwards works for a while before shutting into a denser consistence the device and moving to a separate location. This model is called the vagrant usage model. In this usage protoplast, the user has no need according to maintaining session continuity between locations. Note that this custom model is the same as a wired treatment model for public access dialup or DSL networks, to which place the user connects to a dialup or DSL pursuit in a hotel room, works because of a while, then moves to one more dial up or DSL connection at any other physical location.

For mobile phones and other handheld devices, the trick is in use and a sitting is active while the user is touching around. Telephone calls and their dependant voice sessions are the canonical precedent of such a service, but given conditions sessions in which the user is accessing locality-based services are another possibility. In this model, application sessions stay active while the user is affecting from one geographical location to one more, a property called session continuity. Unlike the migratory model, the mobility usage model has ~t any wired equivalent, since it is not potential to use a wired connection season moving.

In theory, these two usages models are very different, but, in practice, most wireless netting designs attempt to accommodate both, from the time of network operators are interested in maximizing the digit of customers. While the threats to netting access are largely the same notwithstanding both usage models, the primary falling out is the additional complexity that nimbleness injects into wireless access control design so much as for countering the same threats for example in the nomadic model. When inconstancy must be supported, the terminal last ~ and testament be breaking and re-establishing vinculum layer and IP layer connectivity since it moves in and out of course of wireless access points, while maintaining its session.

The security state established at the initial access point when network access is granted forms a security association between the access point and the termination. The security association contains keys providing  and premises origin authentication on link layer frames exchanged betwixt the access point and the limiting. If the terminal moves its constituent piece connection to a new access moment, the security association must be re-established in c~tinuance the new access point. In the pastoral usage model, no session continuity is required.