  This paper elaborates on Conditional Handover (CHO) modelling, aimed at
maximizing the use of contention free random access (CFRA) during mobility.
This is a desirable behavior as CFRA increases the chance of fast and
successful handover. In CHO this may be especially challenging as the time
between the preparation and the actual cell change can be significantly longer
in comparison to non-conditional handover. Thus, new means to mitigate this
issue need to be defined. We present the scheme where beam-specific measurement
reporting can lead to CFRA resource updating prior to CHO execution. We have
run system level simulations to confirm that the proposed solution increases
the ratio of CFRA attempts during CHO. In the best-case scenario, we observe a
gain exceeding 13%. We also show how the average delay of completing the
handover is reduced. To provide the entire perspective, we present at what
expense these gains can be achieved by analyzing the increased signaling
overhead for updating the random access resources. The study has been conducted
for various network settings and considering higher frequency ranges at which
the user communicates with the network. Finally, we provide an outlook on
future extensions of the investigated solution.
