A first base station provides overlapping coverage area with each of a plurality of second base stations. The first base station is of a different base station type than the plurality of second base stations. Each of the plurality of second base stations transmits a message to a plurality of wireless devices in connected mode. The message comprises a subframe allocation bitmap indicating a plurality of subframes. The plurality of subframes comprises a plurality of special subframes. Base stations in the plurality of second base stations configure the same set of subframes as the plurality of special subframes.