Abstract: Systems and methods are disclosed herein for dynamic switching between legs in Carrier Aggregation (CA). In one embodiment, a method performed by a wireless communication device comprises operating to be configured for CA with a Primary Cell (PCell) and a Secondary Cell (SCell) and to configure a first Data Radio Bearer (DRB) associated to a first logical channel and a second DRB associated to a second logical channel. The method further comprises receiving a first parameter that restricts transmission for the first logical channel to the SCell and a second parameter that restricts transmission for the second logical channel to the PCell. The method further comprises receiving a dynamic indication that the SCell is deactivated, receiving an UL grant for the PCell, selecting data from either the first or second logical channel for transmission using the UL grant, regardless of the first and second parameters, and transmitting the selected data.