Patent ID: 8811311

Claim:
An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus to perform at least the following: determine configuration information specifying at least one first contention-based preamble having a lower level of contention severity than at least one second contention-based preamble, the configuration information including an indication indicative of a selection probability of the at least one first contention-based preamble; attempt, when an non-contention-based random access attempt is selected, to select a non-contention-based preamble; transmit, depending on whether the attempt is successful, the access attempt with the non-contention-based preamble or a selected one of the at least one first contention-based preamble; and select the at least one first contention-based preamble with a lower selection probability than the at least one second contention-based preamble.