SQUEEZED BETWEEN THE FLOOR OF THE MCO CLASS B AND THE ORL TRAFFIC PATTERN; SMA PLT HAS CLOSE ENCOUNTER WITH A CESSNA IN THE PATTERN WHILE TRANSITING THE CLASS D.

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I CONTACTED ORLANDO EXECUTIVE TWR AT 10 NM NW OF THE ARPT AND REQUESTED TO TRANSITION THROUGH THEIR AIRSPACE ON A FLT PATH OVER DOWNTOWN ORLANDO AND THE ARPT HDG OUT TO THE E. I WAS INSTRUCTED BY THE CTLR TO PROCEED AS REQUESTED. I DSNDED TO 1300 FT MSL TO REMAIN CLR OF THE ORLANDO CLASS B AIRSPACE THAT BEGINS AT 1600 FT MSL. AS I APCHED DOWNTOWN ORLANDO; I WAS INSTRUCTED BY THE CTLR TO REMAIN N OF THE EXTENDED FINAL FOR RWY 7 (THE ACTIVE RWY). I RESPONDED AND COMPLIED WITH THE INSTRUCTION. I REMAINED N OF RWY 7 AS I FLEW E TOWARDS THE ARPT. AS I OVERFLEW THE ARPT; I REMAINED N OF; AND PARALLEL TO; RWY 7; AND NOTICED A CESSNA WHICH HAD BEEN CLRED FOR TKOF ON RWY 7. I WATCHED AS THE CESSNA CLBED OUT; AND REALIZED THAT GIVEN MY CURRENT FLT PATH; WHEN THE CESSNA TURNED XWIND; IT WOULD BE PASSING DIRECTLY UNDERNEATH ME. THE CTLR RPTED MY POS TO THE CESSNA WHO RESPONDED THEY DID NOT HAVE THE TFC IN SIGHT. I RESPONDED TO THE CTLR THAT I DID HAVE THE CESSNA IN SIGHT; AND THAT I WOULD CLB AND MANEUVER TO AVOID IT; WHICH I DID. THE CTLR THEN MADE SEVERAL PROGRESSIVELY MORE URGENT CALLS TO AN ACFT WITH A DIFFERENT CALL SIGN WHO WAS NOT RESPONDING. I THEN REALIZED THE CTLR WAS ATTEMPTING TO TALK TO ME; BUT WAS USING AN INCORRECT CALL SIGN. I RESPONDED WITH MY CORRECT CALL SIGN; THE CTLR HAD BEEN USING MY CORRECT CALL SIGN UP UNTIL THIS POINT. THE CTLR APOLOGIZED FOR THE ERROR. BY THIS TIME; THE ACFT THAT I WAS AVOIDING HAD PASSED UNDER ME; AND WAS NO LONGER A FACTOR. WE PROBABLY PASSED CLOSE ENOUGH THAT THE CTLR WAS UNDERSTANDABLY CONCERNED; BUT I DID HAVE THE CESSNA IN SIGHT THE ENTIRE TIME AND WAS MANEUVERING TO AVOID IT. THE CTLR ASKED ME TO DISREGARD THE PREVIOUS CALLS AND SUBSEQUENTLY ASKED ME TO REMAIN CLR OF THE EXTENDED UPWIND OF RWY 7 TO MAKE ROOM FOR A DEPARTING JET. I COMPLIED; AND CONTINUED E AND OUT OF THE ORLANDO EXECUTIVE AIRSPACE. I CONTACTED THE CTLR WHEN THINGS CALMED DOWN A FEW MINS LATER AND THANKED THEM FOR THE HELP; AND APOLOGIZED FOR THE CONFUSION. THE CTLR ACKNOWLEDGED AND ALSO APOLOGIZED FOR THE CALL SIGN MISTAKE. I WOULD LIKE TO NOTE THAT THE ORLANDO CLASS B FLOOR AT 1600 FT MSL OVER THE ORLANDO EXECUTIVE ARPT MAKES IT DIFFICULT TO OVERFLY THE ARPT AT A SUFFICIENTLY SAFE ALT ABOVE THE 1100 FT MSL TFC PATTERN.