Regional Jet 200 ER/LR (CRJ200)
Training / Qualification; Communication Breakdown
ATC Issue All Types; Deviation - Speed All Types
Air Traffic Control Issued New Clearance; Flight Crew Executed Go Around / Missed Approach
Procedure
On arrival...; ATC assigned 5;000 feet & and slow to 160 kts.  Our next Clearence was to maintain 5;000 feet until [FIX] cleared ILS 36L. The First Officer was still a low time first officer and wanted to slow to landing configuration on schedule; so we did.  After contacting tower; they asked our speed and we replied we were at our Vref.  They said we were supposed to fly last assigned speed. So we sped up to 160 kts.  However we were cleared for the approach and neither of us recalled a speed restriction nor did I recall reading back one to ATC. Tower turned us off the approach and we were vectored around to try it again.  No further issues were encountered.
Flight crew; initially cleared to 5;000 feet and 160 knots; slowed to Vref after being cleared for an ILS Approach. When switched to Tower frequency; Tower advised that the flight was supposed to maintain 160 knots. Aircraft was vectored around for another ILS Approach.