PLT CROSSES ACTIVE RWY; BELIEVES HE HAS BEEN CLRED.

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I HAD BEEN PARKED IN THE E LOT AT CGX. WHEN I CALLED FOR TAXI CLRNC; I STATED MY LOCATION AS 'ON THE E RAMP' AND WAS GIVEN THE CLRNC 'TAXI TO RWY 36.' NO 'HOLD SHORT' HAD BEEN GIVEN. I HAD RECEIVED SUCH INSTRUCTIONS IN THE PAST AT THIS ARPT IF THEY WANTED ME TO DO SO (SEE DIAGRAM). THERE WAS AN ACFT CLRED INTO 'POS AND HOLD' ON RWY 36; LEADING ME TO BELIEVE THAT HE WAS HOLDING FOR ME TO CROSS. I WAS A BIT UNSURE; AND I RESTATED 'XXX TAXIING FROM THE E RAMP.' WHEN THERE WAS NO ACKNOWLEDGEMENT OF MY XMISSION; I STATED; PRIOR TO XING THE RWY; 'XXX TAXIING ACROSS 36.' THIS ALSO WENT UNANSWERED; SO I CROSSED THE RWY AND ENTERED THE PARALLEL TAXIWAY AND WENT TO THE THRESHOLD END OF 36. IT WASN'T UNTIL I CALLED FOR TKOF CLRNC THAT THE TWR NOTIFIED ME THAT THEY HAD EXPECTED ME TO HOLD SHORT OF 36 AT THE E RAMP. THERE WAS NO TFC CONFLICT; AS THE ACFT ON 36 WAS IN POS AND HOLDING. I INFORMED THE TWR THAT I THOUGHT THE CLRNC TO TAXI TO 36 CLRED ME TO DO JUST THAT; TO TAXI TO THE THRESHOLD OF THE RWY; AND HOLD THERE. THEY INFORMED ME THAT THEY DIDN'T KNOW I WAS ON THE E RAMP; AND THAT THE CLRNC DIDN'T AUTHORIZE ME TO CROSS THE ACTIVE RWY ANYWAY. I HAVE SUBSEQUENTLY REVIEWED THE REGS AND FOUND THAT THEY WERE ABSOLUTELY CORRECT! I GUESS MY PAST EXPERIENCE OF RECEIVING SPECIFIC 'HOLD SHORT' INSTRUCTIONS AT THIS ARPT FROM THIS LOCATION; HAD LED TO AN EXPECTATION OF MY CLRNC TO CROSS THE RWY; BARRING INSTRUCTIONS TO THE CONTRARY. IT DIDN'T FEEL QUITE RIGHT; HOWEVER. I SHOULD HAVE BEEN MORE SPECIFIC IN MY QUERIES TO ATC. MY SUBTLE 'HINTS' AND STATEMENTS NEVER PROMPTED THEM TO CLARIFY MY INSTRUCTIONS. THEY MIGHT BE FAULTED FOR NOT REALIZING THAT I WAS ON THE E SIDE; FOR I HAD STATED SO TWICE; BUT I AGREE THAT THERE IS NO LEGAL REQUIREMENT FOR THEM TO SPECIFY TO 'HOLD SHORT' OF THE ACTIVE UNTIL SPECIFIC CLRNC TO CROSS IS GIVEN. PARENTHETICALLY; I BELIEVE THAT THEY USUALLY DO GIVE SPECIFIC 'HOLD SHORT' INSTRUCTIONS AS AN OPERATIONAL STANDARD AT CGX. I FEEL THAT THE ADDITIONAL REVIEW I HAVE DONE OF FAR/AIM HAS BEEN HELPFUL; AND CLARIFIES IN MY MIND SOME OF THE OPERATIONAL RULES THAT WE RARELY SEE IN REAL-LIFE APPLICATIONS (I HAVE FLOWN INTO CGX AT LEAST 70 TIMES AND NEVER HAD THIS PROBLEM).