A network node is connected to a plurality of antenna nodes that are located along a constrained path where a plurality of wireless communication devices are located. The antenna nodes are controlled to maintain reception radio lobes substantially along the path such that the wireless communication devices can perform uplink radio communication with the network node via the reception radio lobes. At least one RF signal is detected in a PRACH, with a first PRACH configuration. A determination is made of a radio frequency offset of the detected RF signal. A determination is then made that the at least one RF signal originates from a wireless communication device of a specific subset among the plurality of wireless communication devices. Each wireless communication devices in the specific subset is associated with the radio frequency offset. A second PRACH configuration that is common to all wireless communication devices in the specific subset of wireless communication devices is then provided to the wireless communication device.