A method and apparatus for indicating a temporary block flow (TBF) to
which a piggybacked acknowledgement/non-acknowledgement (PAN) field is
addressed are disclosed. A sequence may be generated from a temporary
flow identity (TFI) to which the PAN field is addressed and masked with a
PAN check sequence (PCS). A radio block including a PAN field and a
masked PCS is transmitted. The PCS may be masked with one of TFIs which
is selected in accordance with a rule pre-agreed. A secondary identifier
may indicate a TBF to which the PAN field is addressed. A special value
may be used to represent all TBFs assigned and a secondary identifier may
indicate a TBF to which the PAN field is addressed. A special value on
the PAN field may be used for control purposes for indicating an action
affecting a group of receiving stations listening to the radio block.