7/19/2017 0 Comments Architecture Wifi MeshWhat is Wi. Fi roaming - How Wifi roaming works. The Wi- Fi is a wireless network technology which enables to create local wireless networks. Wi- Fi is created on standard IEEE 8. ISO/CEI 8. 80. 2- 1. Generally, Wi- Fi permits to establish connections between computers, high- rate connections, by two modes: Infrastructure and Ad- Hoc. In Ad- Hoc mode, equipments communicate directly immediately. The infrastructural mode is regularly used with Wi- Fi. Here, on the contrary, computers are connected with an Access Point, which is an obligatory central point to all the communications. The both modes need some information to function: the Service Set Information (SSID), the channel, the data encryption method, a password. Digi XBee ® ZigBee Embedded ZigBee and Thread-ready RF modules provide OEMs with a simple way to integrate mesh technology into their application. Welcome to Sputnik We provide cloud-managed guest Wi-Fi solutions used in thousands of hotspots across the globe. We have some stations which correspond to any material with an integrated Wi- Fi, except from an access point. The connection station- access point is done through two phases: Authentication, where the station willing to enter Wi- Fi network has to authenticate itself, and Association. After Authentication, the station is associated and can broadcast on the network. The access point, on his turn, will relay those information to the aimed receivers. What is Roaming ? The roaming is a technology which enables a station to change his Access Point, internationally, while remaining connected to the network. To accomplish this, operators have to conclude Roaming agreement with foreign operators. For instance, if you comes from South Africa to England, you will be able to keep your South Africa’s number if and if only your South African operator conclude a Roaming contract with an England operator in the area you are. In GSM, ; while in Wi- Fi, Roaming, Handover, are used to represent the same action. Roaming Implementation in Wi- Fi – How Wi. Fi roaming works.
The roaming is not integrated to Wi- Fi, even if Wi- Fi is a wireless network. Contrarily to GSM, Wi- Fi didn’t introduce the notion of itinerancy, which justify roaming absence in the standard IEEE 8. ISO/CEI 8. 80. 2- 1. But today, with the cheapness and the benefits of wireless networks, most company have the willing to use Wi- Fi in all their premises. And they need to pass from an Access Point to another, while remaining connected. So, some operator tried to implement roaming in Wi- Fi through protocols like the Inter Access Point Protocol which need a distribution system to broadcast information between Access Points. This leads to the creation of a “trial and use” (standard 8. F) used further by operators to implement their own methods. With standard 8. 02- 1. F, the station is re- associated, instead of associated during the connection on a new Access Point. Also, the Access Point have to monitor continuously access to the distribution system. There are request, confirm, indication, response. The first function, request, corresponds to a station arrival in the association of areas covered by many Access Points. Confirm indicates if the function request ends correctly. An Access Point sends a function indication after a request to signal his association with the station aimed. And finally, the function response by which the old Access Point send to the new Access Point all the network information about the aimed station. The standard 8. 02- 1. F failed due to the roaming slowing down. But Wi- Fi roaming goes ahead with the development of proprietor solutions.
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