An apparatus operable in a base station transceiver of a mobile communication system, the apparatus comprising a transceiver module comprising interfaces to a plurality of antennas and operable to: subdivide the plurality of antennas in a plurality of subgroups using the interfaces, form a first set of beam patterns, comprising subsectors, using antennas of a subgroup, wherein the transceiver module is operable to use analog beamforming to form the first set of beam patterns; and a control module operable to: transmit a synchronization signal specific for each sub-sector, using the transceiver module and the first set of beam patterns, wherein the synchronization signal comprises information related to radio resources for transmission of a random access preamble; receive a random access preamble signal from a mobile transceiver using the first set of beam patterns, by scanning for the random access preamble in parallel in each subsector of said first set of beam patterns, wherein the random access preamble is specific for each sub-sector, transmit a random access response to the mobile transceiver using the first set of beam patterns, wherein if the random access preamble is detected on one or more of said subsectors, selecting the subsector with the strongest random access preamble signal and transmitting the random access response in this subsector; receive a pilot signal as a response signal after transmission of the random access response from the mobile transceiver using the transceiver module, determine a second beam pattern based on the response signal from the mobile transceiver, the second beam pattern having a higher antenna gain than the first beam pattern, transmit a subsequent signal to the mobile transceiver using the second beam pattern and the transceiver module, subdivide the plurality of antennas in a plurality of subgroups using the interfaces, form a first set of beam patterns, comprising subsectors, using antennas of a subgroup, wherein the transceiver module is operable to use analog beamforming to form the first set of beam patterns; and transmit a synchronization signal specific for each sub-sector, using the transceiver module and the first set of beam patterns, wherein the synchronization signal comprises information related to radio resources for transmission of a random access preamble; receive a random access preamble signal from a mobile transceiver using the first set of beam patterns, by scanning for the random access preamble in parallel in each subsector of said first set of beam patterns, wherein the random access preamble is specific for each sub-sector, transmit a random access response to the mobile transceiver using the first set of beam patterns, wherein if the random access preamble is detected on one or more of said subsectors, selecting the subsector with the strongest random access preamble signal and transmitting the random access response in this subsector; receive a pilot signal as a response signal after transmission of the random access response from the mobile transceiver using the transceiver module, determine a second beam pattern based on the response signal from the mobile transceiver, the second beam pattern having a higher antenna gain than the first beam pattern, transmit a subsequent signal to the mobile transceiver using the second beam pattern and the transceiver module,