An l2 method for a wireless station to locate and associate...

Details An l2 method for a wireless station to locate and associate... An l2 method for a wireless station to locate and associate...

H - Electricity

04

W

H04W 80/02 (2009.01) H04W 80/04 (2009.01) H04L 29/08 (2006.01)

Patent

CA 2492466

A wireless station having a wireless network device capable of providing a link-layer interface to a wireless network, a method operating at the link layer (L2) in the wireless station, and a carrier medium carrying computer readable code segments that when executed on a processor in the wireless station implement the method. The method includes, prior to the station being associated with a wireless network, wirelessly receiving L2 frames transmitted from one or more wireless access point of one or more wireless networks that the station can hear. The method further includes gathering information about the received L2 frames, including L2 information and L3 information. The L3 information includes whether an AP is sending an IP packet from a mobility agent, such that the station may associate with a wireless network that is in communication with the mobility agent. The method further includes storing information about the wireless networks that the station can hear in a database. The information stored about each wireless network includes one or more of an identifier of the wireless network, the L3 information in the L2 frame received from the AP of the wireless network, a time stamp of when the L2 frame was received from the AP, and an indication of the signal strength of the L2 frame from the AP.

Station radio poss~dant un dispositif de r~seau radio capable de constituer une interface de couche de liaison avec le r~seau radio, proc~d~ mis en application au niveau de cette couche de liaison (L2) dans la station radio et support portant des segments cod~s lisibles par ordinateur servant ~ mettre en oeuvre ce proc~d~ quand cette lecture est ex~cut~e sur un processeur dans la station radio. Ce proc~d~ consiste, pr~alablement ~ l'association de la station ~ un r~seau radio, ~ recevoir des trames L2 ~mises depuis un ou plusieurs points d'acc­s radio d'un ou plusieurs r~seaux radio pouvant Útre entendus par la station. Ce proc~d~ consiste, de plus, ~ recueillir des informations concernant les trames L2 re×ues, y compris des informations L2 et L3. Ces informations L3 d~finissent si un point d'acc­s (AP) est en train d'envoyer un paquet de protocoles Internet (IP) depuis un agent mobile, de fa×on que la station puisse l'associer ~ un r~seau radio communiquant avec cet agent mobile. Ce proc~d~ consiste ~galement ~ m~moriser des informations concernant les r~seaux radio que la station peut entendre, dans une base de donn~es. Les informations m~moris~es concernant chaque r~seau radio comprennent un ou plusieurs des ~l~ments constitu~s par un identificateur du r~seau radio, l'information L3 de la trame L2 re×ue du point d'acc­s (AP) du r~seau radio, une marque d'horodatage indiquant le moment de r~ception de la trame L2 provenant du point d'acc­s, et une indication de la force du signal de la trame L2 provenant dudit point d'acc­s.

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