Whether the speedy trial guarantee of the Sixth Amendment to the U.S. Constitution applies to an accused serving a prison sentence on a prior offense?

QUESTION(S) PRESENTED . Whether the speedy trial guarantee of the Sixth Amendment to the U.S. Constitution applies to an accused serving a prison sentence on a prior offense? Whether for speedy trial purposes under the Sixth Amendment to the U.S. Constitution, the issuance of a formal indictment engages speedy trial protection for an accused serving a prison sentence on a prior offense? ; Whether the state can presume that an accused serving a prison sentence on a prior offense has waived by inaction the speedy trial protections of the Sixth Amendment to the U.S. Constitution when the state has not served said accused with the pending indictment?