Embodiments described herein relate to a wireless device, a method therein for buffer status reporting, a network node and a method therein for assigning resources. The method for the wireless device includes determining an amount of data in the buffer to be transmitted in addition to an amount of data previously transmitted but not acknowledged, transmitting a buffer status report to the network node in which the report includes information on the determined amounts, and receiving from the network node a scheduling assignment for enabling the wireless device to transmit of the unacknowledged data and the remaining data in the buffer.