The feature MCCCH is provided to increase the capacity for paging, immediate
assignment and channel requests in the network. This is made by introducing
the channel combination VI (according to 3GPP TS 45.002) BCCH + CCCH.
When using a LAPD Concentration Factor > 1 and MCCCH is used a maximum
of 3 CCCH channels can be used. This is due to that the LAPD link load is
close to or above the recommended maximum value of 80% when using 4
CCCH at their full capacity.
When using Packet Abis with MCCCH the maximum of 4 CCCH channels
per cell can be used