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<h2>DFCA frequency hopping mode</h2>

<p>DFCA hopping is based on synthesised frequency hopping, where the TRX
unit changes the used frequency according to the given hopping sequence. In
DFCA hopping, the TRX supports independent cyclic hopping sequences for each
time slot that can be freely selected with each channel activation. </p>


<p>With DFCA hopping, the BSC can freely select the MA (Mobile Allocation)
list, MAIO (Mobile Allocation Index Offset), and TSC (Training Sequence Code)
for each TCH activation, allowing the DFCA algorithm to choose the most suitable
radio channel for each new connection or handover based on the C/I criteria.
This full freedom in channel selection allows DFCA to achieve the best performance
with DFCA hopping mode.</p>


<p>The DFCA hopping mode is only applied in the TRXs dedicated to DFCA
use (DFCA TRXs). The BCCH TRX is always in non-hopping mode and the other
regular TRXs can use RF hopping or operate on a fixed frequency without frequency
hopping. Since the DFCA algorithm takes care of selecting the most suitable
frequency hopping parameters for each connection, there is no need to plan
frequencies or frequency hopping parameters for the DFCA TRXs as each time
slot in a DFCA TRX can use any MAIO and any of the DFCA MA lists. However,
the BCCH TRX needs to be assigned a frequency and the regular TRXs (if they
exist) also need to be assigned a frequency or frequency hopping parameters.
The general configuration of a DFCA hopping BTS is presented in the figure
below. </p>


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