THE PLT OF A LIGHT TWIN TAXIED WITHOUT A CLRNC DURING ATCT OP. THE PLT THOUGHT THAT HE HEARD TWR INSTRUCTIONS TO TAXI.

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FILED IFR FLT PLAN. FSS REQUESTED MOTOWN 8 DEP LAYNE; DIRECT MBS V133 TVC. AT AROUND XA30 EDT; LISTENED TO ATIS (133.0). CONTACTED GND CTL (121.9). IFR DET TO TVC. GND CTL ACKNOWLEDGED AND THEN SEEMED TO HAVE FORGOTTEN ME. THEN GND CTL CAME BACK ON 121.9 'EVERYBODY LISTEN UP AND COME UP ON TWR 121.3.' CONTACTED TWR ON 121.3 AND REQUESTED IFR CLRNC DET-TVC. HE THEN GAVE ME MY CLRNC. I READ BACK CLRNC; HEARD 'READBACK CORRECT.' I THEN THOUGHT HE SAID TAXI RWY 15. I STARTED TO TAXI; THE CTLR SAID TO TURN R ONTO RAMP AND HOLD; THAT HE HAD NOT GIVEN ME PERMISSION TO TAXI. I APOLOGIZED. HE SAID NO PROB; BUT NOT TO TAXI WITHOUT PERMISSION. HE THEN GAVE ME TAXI CLRNC TO RWY 15. AFTER RUNUP; CALLED AND SAID READY TO GO; CLRED ME FOR TKOF 'WITHOUT DELAY; LNDG TFC.' I DO NOT BELIEVE THAT 1 PERSON CAN HANDLE GND; GIVE IFR/VFR CLRNCS; TAXI CLRNCS FOR INCOMING AND OUTGOING TFC; AND CTL LNDG AND DEPARTING TFC ON A VFR DAY AT PEAK HRS IN A METRO AREA LIKE DET ARPT IN A SAFE AND ORDERLY MANNER FOR ALL PARTIES INVOLVED.