Method for providing identification and access with respect to a passive radio-frequency tag (Tag 3) in a tag population (Tags 1-5), the passive tag (Tag 3) being configured for receiving commands, among which commands for acknowledging a tag, referred to as ACK, an ACK command comprising an identification parameter in the form of a 16-bit number, the tag (Tag 3) having: - a slot counter holding a value determining the point in an inventory round at which the tag (Tag 3) may respond to a reader (Reader A) - a state that characterizes the tag's behavior and response to the reader's commands, said state being part of a state list comprising: ∘ Ready, which is a holding state for a tag not currently participating in an inventory round ∘ Arbitrate, which is a holding state for a tag currently participating in an inventory round and whose slot counter holds a nonzero value, and ∘ Open or Secured, which are states a tag transitions to when a reader starts accessing it said method comprising the following steps, performed by the tag (Tag 3) initially in the Ready state: - receiving a command for identifying and accessing a tag, referred to as initiating command, said initiating command comprising a slot number having a first value - if the value in the slot counter of the tag (Tag 3) is equal to the first value, then transitioning to the Open or Secured state, otherwise transitioning to the Arbitrate state - in a case where the tag (Tag 3) has transitioned to the Arbitrate state: ∘ receiving a command for repeating a tag access request, referred to as repetition command, said command comprising a slot number having a second value, different from the first value, said second value being equal to the value in the slot counter of the tag ∘ transitioning to the Open or Secured state - receiving an ACK command - ignoring said ACK command. - a slot counter holding a value determining the point in an inventory round at which the tag (Tag 3) may respond to a reader (Reader A) - a state that characterizes the tag's behavior and response to the reader's commands, said state being part of a state list comprising: ∘ Ready, which is a holding state for a tag not currently participating in an inventory round ∘ Arbitrate, which is a holding state for a tag currently participating in an inventory round and whose slot counter holds a nonzero value, and ∘ Open or Secured, which are states a tag transitions to when a reader starts accessing it ∘ Ready, which is a holding state for a tag not currently participating in an inventory round ∘ Arbitrate, which is a holding state for a tag currently participating in an inventory round and whose slot counter holds a nonzero value, and ∘ Open or Secured, which are states a tag transitions to when a reader starts accessing it - receiving a command for identifying and accessing a tag, referred to as initiating command, said initiating command comprising a slot number having a first value - if the value in the slot counter of the tag (Tag 3) is equal to the first value, then transitioning to the Open or Secured state, otherwise transitioning to the Arbitrate state - in a case where the tag (Tag 3) has transitioned to the Arbitrate state: ∘ receiving a command for repeating a tag access request, referred to as repetition command, said command comprising a slot number having a second value, different from the first value, said second value being equal to the value in the slot counter of the tag ∘ transitioning to the Open or Secured state ∘ receiving a command for repeating a tag access request, referred to as repetition command, said command comprising a slot number having a second value, different from the first value, said second value being equal to the value in the slot counter of the tag ∘ transitioning to the Open or Secured state - receiving an ACK command - ignoring said ACK command.