Knowledge Base

How to setup zero sense roaming AP Side Configurations


AP Side Confifuration

 

AP will not set relative parameter of roaming,but must meet the following conditions:

1.Wireless working mode of AP must be AP-WDS mode;

2.AP channel of all involved zero sense roaming must be the same;

3.SSID of all AP must be the same;

4. Configuration is not encrypted

 

Station Side Configuration

 

Station must meet the following conditions:

1.       Wireless working mode of station must be Station-WDS mode;

2.       Wireless Page only set linked SSID,not lock AP MAC address

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Roaming RSSI Threshold: set current link switch trigger threshold. When RSSI is lower than the value user set, it will trigger link switch probably. Roaming SSID threshold is just a necessary condition of link switch, not full condition.

 

Max Links hold Number: set links No. that Station can keep, 2 links or 3 links. The default is 2 links.

Roaming RSSI Gap:  the second necessary condition of link switch. When difference threshold is greater than the value user set, it will trigger link switch probably. This threshold is just a necessary condition of link switch, not full condition.

 

Link Scan Interval: set can interval of Station.The shorter scan interval, the faster link RSSI updates, more efficient the switch, but it also will effect the bandwidth of much more data transmission. The longer scan interval, the less influenced efficiency of data transmission, but it will effect RSSI update frequency, causing bad switch results.

Advice: In the network of slow speed and high bandwidth, extend scan interval;

           In the network of fast speed and low bandwidth, speedup scan interval;

 

Link Hold Time: set min hold time of current link, the third necessary condition of link switch. In order to prevent link continual switch and affect transmission efficiency, add function of Link Hold Time. Current link must keep time slot user sets. Only after this time slot, link switch can go on.

 

In conclusion, three necessary conditions of link switch as follows:
  1. Current link RSSI is less than or equal to roaming RSSI threshold;  
  2. Current link and backup link RSSI difference is greater than or equal to roaming RSSI gap;
  3. Current link working time is greater than or equal to link hold time;
When meet above three conditions, just trigger link switch of Zero Sense Roaming.