Best practice: Planning your organization's Wi-Fi infrastructure
The following guidelines are intended to help you design a Wi-Fi infrastructure that permits BlackBerry devices to connect to an access point that has a medium-to-high data rate. When the data rate of the access point is too low or the signal strength of the access point is too weak, the device should roam to an access point with a higher data rate or a stronger signal strength. When designing your organization's Wi-Fi infrastructure, you should consider the following guidelines:
- Establish a minimum signal strength level of -65 dBm in the planned coverage area.
- Establish a minimum SNR of 25 dB in the planned coverage area.
- When roaming in the planned coverage area, make sure that it takes no longer than 50 milliseconds to perform an access point to access point handoff.
- Eliminate any 802.11b-only devices and the associated data rates. By eliminating the 802.11b-only devices, 802.11g devices do not need to enter protection mode, which reduces the maximum data throughput of the devices.
Using Wi-Fi enabled BlackBerry devices for making and taking BlackBerry MVS calls from a home office or a hotspot is unpredictable because of the instability of those types of networks and cannot be expected to be as reliable as when the user is in a controlled environment. If your organization's users make Voice over Wi-Fi calls from a home office or hotspot, you must make sure that the integrated VPN client on their BlackBerry devices is configured for a connection to your organization's network through the Internet.
For more information about planning your organization's Wi-Fi infrastructure, visit http://na.blackberry.com/eng/ataglance/networks to see the Considerations for Planning and Deploying a Wireless LAN document.