Regarding Tunnel Cells ( Critical issue)

Dear All,

I am finding a very critical issue.

I am working with MTNL- Delhi project. Here we have Tunnel cells or underground metro cells (Leaky Cable used). In metro rail sites we are finding very poor TCH Drop rate.

In some areas the cells are defined cell area boundry with IBS (Under ground) and normal sites ( where we are coming out from the underground to ground level).

Please suggest me what could be the reason behind this ?

Also solutions for this.

Also suggest me which parameters have to tune in BSC leve.

Thanks in advance. . .