SMA PLT ON IFR FLT PLAN DENIED REQUEST FOR LOWER WHEN ENCOUNTERS ICING. DSNDS AFTER TELLING CTLR.

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INCIDENT OCCURRED ENRTE FROM KINSTON; NC (ISO); TO BEDFORD; MA (BED). FLYING ON AN IFR FLT PLAN AT 7000 FT MSL. TOP OF CLOUD DECK HAD BEEN AT 5000 FT TO 6000 FT ENRTE SW OF HFD VOR CLOUD TOPS BEGAN CREEPING UP. MY OPTIONS; GIVEN THE TEMP (0 DEGS); WAS TO CLB TO 9000; BUT IT APPEARED THAT THE BASE OF THE NEXT LAYER WOULD PUT ME IN THE SAME SITUATION DOWN THE ROAD. AT THAT POINT I REQUESTED 5000 OR LOWER; AND WAS ENTERING CLOUD DECK AT THE SAME TIME. CTLR DENIED REQUEST (AFTER I TOLD HIM I WAS EXPERIENCING LIGHT ICING) FOR DSCNT. HE ASKED IF I HAD DEICING EQUIP; NEGATIVE; AND IF I HAD GOTTEN A WX BRIEFING (STUPID). I ACTUALLY HAD A PREFILING BRIEFING AND AN ENRTE FROM BOSTON FLT WATCH/RADIO? ICE WAS NOW CONTINUING TO BUILD AND I TOLD THE CTLR I WAS GOING TO DSND NOW. HE DENIED MY REQUEST. I STARTED DOWN. HE FINALLY GAVE ME VECTORS FOR DSCNT. LEVEL AT 3000 FT. NO PROBLEM. NEXT; CALL THE TWR. THIS WAS MY FIRST AND LAST; HOPEFULLY; EXPERIENCE WITH ICE. CALLED THE TWR CHIEF AND MATTER WAS RESOLVED. NO ATC ACTION. CONCLUSION: AS PIC; EITHER DECLARE AN EMER OR REQUEST IMMEDIATE VECTORS AND DSCNT TO NEAREST ARPT. DO NOT HESITATE. DO NOT EXPECT ANYONE ELSE TO KNOW YOUR CIRCUMSTANCES. BE ASSERTIVE AND DEFINITE WITH YOUR REQUEST. IF ALL ELSE FAILS; CHK YOUR MEA; AND DO IT; FACE THE MUSIC LATER -- IN 1 PIECE.