Zero Sense Roaming is a kind of WLAN optimization function for application of fast moving and seamless switching. Wisnetworks zero sense roaming technology can meet the needs of zero packet loss switching between AP for wireless stations/clients. Common application scenarios have public transport, driving school, mine tunnel communication and so on.
In the driving school test, one training car is driving in the coverage of AP1 in the time of T0. And the training car will send back video streaming to monitoring center by BST1.
From time T0 to T1, the training car is gradually moving to overlap region of BST1 and BST2. In this region, vehicle station scans the SSID of BST2 and build a backup link '2' with it. And the signal of BST1 is stronger than BST2.
From time T1 to T2, the training car is gradually moving away form BST1. AT this time the signal of BST1 is gradually weaker and BST2 is stronger. When the signal of BST1 is lower than threshold of vehicle terminal, vehicle terminal will switch to link '3' to BST2 and link '2' will become backup link. Until time T2, vehicle terminal will totally switch this link as link '4' for signal leaving BST1 coverage region.
Traditional wireless roaming takes too long time. Especially voice and video are hard to tolerate lags and latency. Wisnetworks zero sense roaming just takes maximum 50ms and can meet the needs of most voice and video transmission between base stations.