Jaggu,
2+2+2 means a BTS configured with 3 sectors, and 2 transceivers per sector.
sector 1 with 2trx
sector 2 with 2trx
sector 3 with 2trx
One sector = one antenna, pointing towards one direction. With 3 sectors, a site can cover 360 degrees. (each sector covers approx. one third of the circle)