A wireless device may receive message(s) comprising configuration parameters of cells grouped into a first cell group and a second cell group. One or more first grants for transmission in a first subframe on one or more first cells of the first cell group are received. The one or more first cells may comprise an LAA cell. One or more second grants for transmission in a second subframe on one or more second cells of the second cell group may be received. The first subframe may overlap the second subframe. The first subframe may lead the second subframe by a timing difference. In response to the timing difference being larger than a timing value, a power scaling rule may be applied to transmissions corresponding to the one or more second grants based on whether a listen before talk procedure indicates a clear channel for the LAA cell.