A B757-200 PIC RPT ON A FREQ OVERLAP AND SIMULTANEOUS XMISSION PROBS BTWN COMPANY RAMP CTL AT PHX AND COMPANY OPS AT LAS; NV.

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APCHING LAS FROM OVER GCN AT FL310; WE ATTEMPTED TO CONTACT LAS OPS TO GIVE OUR IN-RANGE CALL. WE WERE 140 NM E OF LAS; APCHING TOP OF DSCNT. WE WERE UNABLE TO COMPLETE OUR CALL WITHOUT NUMEROUS TRIES; BECAUSE AT THAT LOCATION AND ALT WE COULD ALSO HEAR PHX (COMPANY) RAMP CTL AND ACFT ON THE GND AT PHX. I ASSUME THAT OUR CALL TO LAS WAS BLOCKING THE PHX FREQ; AS WELL AS THEM BLOCKING US. I HAD TO ABANDON THE EFFORT; MAKE THE CABIN PA WITHOUT GATE INFO; CALL LAS OPS BACK AT A LOWER ALT; AND THEN MAKE ANOTHER PA TO INFORM THE PAX ABOUT OUR ARR GATE AND UNSCHEDULED ACFT CHANGE. THIS REQUIRED ME TO BE OFF THE ATC RADIO DURING THE DSCNT UNTIL ALMOST REACHING FL180. THIS INCREASES THE PF'S WORKLOAD; AND REDUCES SAFETY. THIS IS A COMMON OCCURRENCE WHEN APCHING LAS FROM THE E; AND THE ISSUE IS PARTICULARLY BAD DURING A PHX BANK MOVEMENT. I HAVE RECOMMENDED TO OUR COMPANY THAT THEY LOOK INTO GETTING A FREQ FOR LAS OPS THAT IS DIFFERENT FROM ANY OF THE PHX FREQS. I FRANKLY DON'T EXPECT THEM TO TAKE ACTION; AS I HAVE WRITTEN SIMILAR RPTS ABOUT THIS ISSUE OVER MANY YRS; WITH NO RESULTS.