Immediate assignment sent twice

Hi expert,
I was sniffing real network GSM packets and i realized whenever the network sends Immediate Assignment message, it sends it multiple times (Based on the number of TRX). in this case, it sends Immediate assignment twice (picture bellow).

here is detailed packets.

As You can see the Frame numbers are not same, meaning that in the same multi-frame, the network sends immediate assignment twice with different antenna numbers but same frequency towards same user (here with RA number of 120.
can anyone please explain what is going on?