US 12,323,870 B2
Seamless handoff between wireless access points (APs) with use of pre-convergence packet replication
Victor M. Moreno, Carlsbad, CA (US); Sanjay K. Hooda, Pleasanton, CA (US); and Errol Fenton Roberts, Ardsley, NY (US)
Assigned to CISCO TECHNOLOGY, INC., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Nov. 29, 2021, as Appl. No. 17/536,874.
Prior Publication US 2023/0171662 A1, Jun. 1, 2023
Int. Cl. H04W 36/00 (2009.01); H04W 36/18 (2009.01); H04W 36/32 (2009.01)
CPC H04W 36/18 (2013.01) [H04W 36/0058 (2018.08); H04W 36/0061 (2013.01); H04W 36/00835 (2018.08); H04W 36/326 (2023.05)] 20 Claims
OG exemplary drawing
 
1. A method performed at a wireless local area network (LAN) controller (WLC) associated with a network fabric or at a cloud server, the method comprising:
obtaining, by the WLC or the cloud server, telemetry data associated with the network fabric, the telemetry data including signal strength information associated with a plurality of wireless access points (APs) of the network fabric;
identifying, by the WLC or the cloud server, that a signal strength between a current wireless AP and a wireless endpoint is below a first threshold based on the signal strength information included in the telemetry data;
based on the identifying:
selecting, by the WLC or the cloud server, addresses of a set of handoff candidate wireless APs for the wireless endpoint based on the signal strength information included in the telemetry data, wherein the selecting by the WLC or the cloud server includes:
selecting a plurality of neighboring wireless APs of the current wireless AP; and
for each one of the plurality of neighboring wireless APs of the current wireless AP, selecting a corresponding neighboring wireless AP to be included in the set of handoff candidate wireless APs based on identifying that a signal-to-noise ratio (SNR) between the corresponding neighboring wireless AP and the wireless endpoint is above a second threshold; and
communicating, by the WLC or the cloud server, to a map server, a message to register, as entries in a replication list, a plurality of routing locators associated with the addresses of the set of handoff candidate wireless APs for association with an address of the wireless endpoint.