MT8852B AFH Adaptive Frequency Hopping (Option 15)
15-4 PN: 13000-00205 Rev. N MT8852B Operation Manual
15-4 MT8852B AFH
Adaptive frequency hopping is not enabled automatically when the MT8852B connects to a
slave device that also supports AFH. The Host Controller must send explicit commands to
enable or disable AFH operation.
The MT8852B has no algorithms for identifying the usability of channels, and as a result does
not generate a "local assessment scheme". Instead, commands at the user interface can be
used to block channels in the creation of a "pseudo local assessment map". The resultant
active channel map is the logical OR of this pseudo local assessment map and the slave's local
assessment scheme (if the user enables use of this data). This is shown in the figure below.
The Host Controller may change the AFH Channel Map at any time by sending an HCI
command to the Bluetooth Controller. If there is an active connection that has AFH enabled,
the new AFH Channel Map is adopted immediately. At other times the AFH Channel Map is
stored in the Bluetooth Controller and used when AFH is next enabled.
The MT8852B gives the user three methods of verifying that AFH is functioning correctly:
• From Channel Use vs Time Information
• From FER vs Time Information
• From AFH from audio measurements
Figure 15-4. AFH Channel Map
Note
The majority of EUTs are not able to update the AFH local assessment when being
operated in test mode.
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