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2.6.11 Concurrent Use with WLAN
Since Bluetooth employs frequency in the same range (2.4GHz ISM band) with WLAN, basically
Bluetooth cannot be operated at the same time with WLAN. However, it is possible to make
mutual interference less without turning off the power of each device by following the below
instruction.
If the partner Bluetooth device supports AFH (Adaptive Frequency Hopping)
1. Separate the frequency range for Bluetooth and for WLAN definitely.
2. If AFH is used at the automatic setting mode, according to the inherent characteristics of AFH
function Bluetooth causes interference to the frequency range which WLAN uses. In this case,
specify the frequency range with the Bluetooth connection tool which Bluetooth should not
use, in other words, the frequency range which WLAN uses.
3. Confirm that the Bluetooth device of the communication partner supports AFH function.
Bluetooth connection should be established first by the terminal to the Bluetooth device. If this
is carried out in the opposite way, there is possibility that AFH function does not run due to
that the frequency range set by the terminal cannot be used.
4. As usable frequency range for Bluetooth is restricted by AFH function, mutual interference
among Bluetooth devices or interference from other device are apt to be suffered. If the
performance of Bluetooth communication ranks important, set the frequency range for
Bluetooth as wide as possible. This is a matter of trade-off for WLAN.
If the partner Bluetooth does not support AFH (exclusive use of Bluetooth and WLAN)
1.
Confirm that WLAN communication has been finished before performing Bluetooth
connection. If Bluetooth connection is performed while WLAN is used, radio wave from
Bluetooth will significantly affect WLAN communication. Communication error by
interference by Bluetooth radio wave can be reduced if Bluetooth communication is started
after receiving data via WLAN.
2.
Confirm that Bluetooth communication has been finished and Bluetooth connection is
terminated before WLAN communication starts.
3.
If another terminal fails to perform communication via WLAN or Bluetooth, keep the
terminal away from this terminal as far as possible and start to operate Bluetooth again.
4.
For WLAN communication to carry out, operate the terminal as close to Access-Point (for
WLAN) as possible. As it is assumed that Bluetooth devices are operated near by the user,
affect by interference mainly occurs on WLAN device. If the terminal distances from the
Access-Point, affect by interference generated by Bluetooth device will increase causing
LAN communication to fail. If this happens, place the terminal as near to the Access-Point as
possible and operate WLAN communication again.
Note:
Even if either one of the methods described above has been determined to be effect, thorough
check and assessment on the site and for system designs must be carried out prior to concurrently
operating Bluetooth and WLAN communications.
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