{HEAD ~ The method} 2, wherein performing {TAIL ~ the MIMO mode switching} for the cell comprises: 
wherein performing
{ HEAD ~ The method } 2 , wherein performing { TAIL ~ the MIMO mode switching } for the cell comprises :
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH