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Looking for 802.11 rfc in regards to client roaming

Specifically, I'm looking for information in regards to the client determining when to roam.  Any ideas on spec documents?

Thanks,

Raun

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New Member

Looking for 802.11 rfc in regards to client roaming

I know these are typically vendor specific, but I thought there should be some basic rules/guidelines that vendors would follow.

Looking for 802.11 rfc in regards to client roaming

Raun,

Yes there are basic rules the vendors follow but those rules are still vendor specific.

Vendors usually depend on signal strength, delay, noise, packet loss...etc in order to decide when to roam. But each vendor takes different decision based on the equation they use to decide roaming.

For example, if there are two APs show good signal to a client while the clients is moving from one AP toward another, one client may decide to roam because there is a new signal that is stronger. Another client however may decide not to roam if the connection to the old AP is still OK although the new signal strength is higher.

If you want you need to look into vendors documents about how they decide roaming. some vendors allow you to modify roamign aggressiveness though:

Roaming Aggressiveness
This setting allows you to define how aggressively your Wi-Fi client roams to improve connection to an access point. Click Use default value to balance between not roaming and performance.

  • Lowest: Your wireless client will not roam. Only significant link quality degradation causes it to roam to another access point.
  • Medium-Low/Medium-High: Allow Roaming.
  • Medium: Balanced setting between not roaming and performance.
  • Highest: Your Wi-Fi client continuously tracks the link quality. If any degradation occurs, it tries to find and roam to a better access point.

Reference: http://www.intel.com/support/wireless/wlan/sb/CS-025393.htm

Another link may help: http://howto.techworld.com/mobile-wireless/438/make-your-wlan-roam-faster/

HTH

Amjad

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Looking for 802.11 rfc in regards to client roaming

Also, for CCX enabled adapters, you can find the roaming process in this link:

http://www.cisco.com/en/US/products/hw/wireless/ps430/prod_technical_reference09186a00801c5223.html#wp39098

HTH

Amjad

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Cisco Employee

Looking for 802.11 rfc in regards to client roaming

Roaming is pure client decision, which means that every vendor has their own proprietary roaming logic.

In general most of them use the following:

- RSSI reading

- Missing beacon frames

- Frame retrasmissions

The agressiveness of roaming can be generally tuned on most clients today.

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