Roaming Techniques for High Speed Client Device

摘要

Access points and a wireless client device, such as a workgroup bridge, are configured to optimize a roaming algorithm of the client device for a high-speed vehicle scenario, such as a high-speed train. A static/dynamic neighbor list is generated and used to improve scanning efficiency. An improved parent access point selection procedure, metrics, and thresholds are provided to optimize client roaming along the vehicle's path, e.g., the train track.

主权项

1. A method comprising:
at a wireless client device configured to connect with access points (APs) over wireless channels of the APs and route traffic between multiple devices served by the wireless client device and the connected APs:
receiving a neighbor list from an access point (AP) to which the wireless client device is currently connected over a wireless channel, wherein the neighbor list identifies neighbor APs and wireless operating channels thereof in a vicinity of the AP;if a link quality of the wireless connection falls below a roam threshold, attempting to roam to a neighbor AP on the neighbor list, wherein the attempting to roam includes:
actively scanning the wireless operating channels in the neighbor list;determining a best neighbor AP on the neighbor list to which to roam based on results of the active scanning; andif a best neighbor AP is determined, roaming to the best neighbor AP.