PVT PLT GETS CONFUSED BY PDX TWR CTLR INSTRUCTIONS.

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CALLED PDX CLRNC DELIVERY ON 119.00 AND REQUESTED DOWNWIND DEP TO TRANSITION ALONG N BANK THROUGH TROUTDALE. DEST; SUNRIVER. WAS TOLD TO CALL PDX TWR ON ANOTHER FREQ. DID AS REQUESTED; MADE EXACT SAME REQUEST. TWR TOLD ME TO PROCEED TO S BANK; WHICH I DID. SINCE TWR HAD TOLD ME TO STAY OUT OF CLASS C AIRSPACE UNTIL RADAR IDENTED I STAYED ON N BANK IN CLASS D AIRSPACE. I CALLED TWR TO REMIND THEM WHERE I WAS. HE TOLD ME I MADE AN ILLEGAL L TURN. THEN HE TOLD ME I COULD TURN R ANY TIME. I TRIED TO FIGURE OUT WHAT HE MEANT; THEN HE SAID 'WE ARE NOT COMMUNICATING.' HE THEN SAID I HAD REQUESTED A MIDFIELD XING. I TOLD HIM I HAD NOT. HE PAUSED A LONG TIME (MAYBE LISTENED TO A TAPE?); THEN HE CAME BACK AND APOLOGIZED FOR HIS MISTAKE. CONTRIBUTING FACTORS: 1) HE TALKED WAY TOO FAST. 2) MY WIFE AND I DEBATED WHAT HE WANTED ME TO DO. 3) THERE IS CONFUSION OVER N BANK AND S BANK. DOES S BANK MEAN SOUTHERN EDGE OF WASHINGTON LAND OR SOUTHERN EDGE OF COLUMBIA RIVER (IN OREGON)? 4) ATC THOUGHT I ASKED FOR A MIDFIELD XING; IN FACT I ASKED FOR TRANSITION TO TROUTDALE ALONG THE N BANK.