RWY INCURSION. A BE99 ATX CARGO PLT USES RWY 29 FOR TAXI TO TXWY U IN ACCORD WITH CLRNC RECEIVED; CREATING THE NEED FOR AN ACR GAR AT OAK; CA.

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FROM THE CARGO RAMP; I ASKED FOR CLRNC TO TAXI TO RWY 29. MY CLRNC WAS 'XXX; TAXI TO RWY 29 VIA TXWY T; TXWY U; TXWY W.' I ACKNOWLEDGED THIS CLRNC AND TAXIED TO RWY 29 VIA TXWY T; TXWY U; TXWY W. AT THIS TIME; I WAS AT THE RUN-UP AREA AT RWY 29. AFTER PERFORMING MY RUN-UP; I SWITCHED TO THE TWR FREQ AND STATED 'XXX; READY RWY 29.' THE REPLY WAS 'XXX; HOLD SHORT RWY 29; FOR RELEASE.' I ACKNOWLEDGED THIS REQUEST. THEN A LARGE JET LANDED ON RWY 29. AFTER THAT; I WAS ASKED IF I COULD ACCEPT AN INTXN DEP AT TXWY U; WITH 5000_ FT OF RWY REMAINING. I ACCEPTED THIS REQUEST; BUT I DIDN'T UNDERSTAND THE REASON. NEXT; THE TWR SAID 'TAXI DOWN RWY 29 AT TXWY U AND HOLD SHORT RWY 29 AT TXWY U.' I READ BACK THAT CLRNC AS FOLLOWS: 'XXX; TAXI DOWN ON RWY 29 TO TXWY U; AND HOLD SHORT RWY 29' THE WORD 'ON' WAS EMPHASIZED IN THE READBACK. I BEGAN TAXI ON RWY 29; AND THE TWR ASKED IF I WAS ON THE RWY. I REPLIED 'THAT'S CORRECT; I AM ON RWY 29; TAXIING TO TXWY U.' SUDDENLY; THE CTLR COMMANDED A LARGE JET TO GO AROUND. I CONTINUED DOWN THE RWY; EXITED AT TXWY U; AND HELD SHORT OF RWY 29. AFTER A BRIEF PERIOD OF SILENCE; THE CTLR CLRED ME FOR TKOF AND I DID SO. I THINK; 1) THE CTLR WAS BUSY (WITH OTHER FREQS). 2) THE CTLR SHOULD HAVE GIVEN ME A BETTER CLRNC LIKE 'MAKE A 180 DEG TURN AND TAXI ON TXWY W TO TXWY U. 3) THE CTLR DIDN'T EXPLAIN THE REASON OF INTXN DEP WHEN I WAS ALREADY FULL LENGTH AND I SHOULD HAVE HAD IT CLARIFIED. 4) BECAUSE AT OAK; CTLRS SOMETIMES GET IMPATIENT WHEN ASKED TO EXPLAIN A CLRNC. 5) I SHOULD HAVE ASKED THE REASON FOR INTXN DEP ANYWAY. 6) I SHOULD HAVE ASKED THE CTLR TO REPEAT CLRNC AND CLARIFY IT. 7) I ALSO THINK THAT THE CTLR THOUGHT I WAS SOMEWHERE ELSE ON THE ARPT. 8) BECAUSE I READ BACK 'TAXI DOWN ON RWY 29' AND THE CTLR DIDN'T COME BACK WITH A CORRECTION I THOUGHT THAT WAS THE RIGHT CLRNC. 9) BETTER TERMINOLOGY ON BOTH SIDES SHOULD HAVE HELPED.