AN MD80 LANDS AT MIA; THEN; AS HE TRIES TO TAXI FROM THE RWY TO GATE; THEY ARE UNABLE TO BE IN RADIO COM WITH THE GND CTLR. CAPT KEPT THE ACFT MOVING FORWARD UNTIL HE HAD CLRNC FROM THE RAMP CTLR TO MOVE INTO THE GATE AREA.

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WE LANDED ON RWY 9L AT MIA. CLRING THE RWY; THE CAPT TOLD ME TO CONTACT RAMP CTL AND THAT HE WOULD TALK WITH GND. WE TAXIED BACK TOWARD THE RAMP. WHEN I CAME BACK UP ON GND FREQ; I WAS INFORMED BY THE CAPT THAT HE HAD BEEN UNABLE TO CONTACT GND TO EVEN XMIT DUE TO THE EXTREMELY HVY FREQ CONGESTION. AS WE NEARED THE RAMP ENTRANCE; RAMP CTL CLRED US IN; AND WE TAXIED ON THE RAMP TO THE GATE. WE RECEIVED NO XMISSIONS FROM GND. RADIO FREQ CONGESTION TO THE DEGREE THAT IT IS IMPOSSIBLE TO GET A WORD IN EDGEWISE CAN SERIOUSLY AFFECT SAFETY AS WELL AS IMPEDE TFC FLOW AROUND AN ARPT. HAD WE HAD AN EMER REQUIRING ANY ASSISTANCE WE WOULD NOT HAVE BEEN ABLE TO GET THROUGH TO GND. IN THIS CASE THE CAPT TOLD ME THAT 1 ACFT HAD BEEN TYING UP GND CTL. PERHAPS GND SHOULD HAVE DEALT WITH THIS PARTICULAR ACFT WHEN HE HAD MORE TIME TO DO SO; NOT DURING A BUSY PERIOD WHEN OTHER ACFT WERE TRYING TO CONTACT GND. MAYBE MORE GND FREQS AND CTLRS ARE NEEDED TO HELP RELIEVE THE CONGESTION. I DO NOT KNOW THE ANSWER -- BUT I DO FEEL THAT THIS ISSUE DESERVES THE ATTN OF US ALL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE TWR WAS BUSY TRYING TO COMMUNICATE WITH AN ACFT IN THE CARGO AREA THAT WAS CONFUSED WITH WHERE TO TAXI. THE TWR WAS SO INTENT IN COMMUNICATING WITH THAT ACFT THAT THERE WAS NO WAY TO BREAK INTO THE RADIO COMS TO STATE REQUEST OR RPT NEED TO TAXI TO THE GATE. RPTR REALLY WANTS ANOTHER FIRST OR SECOND FREQ FOR BACKUP JUST IN CASE THIS SHOULD HAPPEN AGAIN. THE OTHER PLT KEPT THE ACFT MOVING TOWARDS THE PARKING AREA. THERE WERE SO MANY ACFT LNDG THE RWY HAD TO BE KEPT CLR. BY KEEPING THE PREVIOUSLY LANDED ACFT MOVING TOWARDS THE GATE THE RWY WAS NEVER BLOCKED. ALL THE OTHER ACFT SEEMED TO BE DOING THE SAME THING.