layering gsm NSN with DCS huawei

[sabila]

hello all,

does any one have experience in layering
GSM with vendor NSN + DCS from Huawei

the problem now is,
i have some region with GSM system from NSN
and we will expand the network capacity with DCS from huawei
the two bsc will handle by 1 MSC,
i wanna ask
1.what the impact of the layering with differnt vendor like this??
2.how much harder the MSc will work.
3.and especially for the performace impact
4.and how to maintain the performance


many thanks