 random access procedures in case no contention-free preambles are available For contention-based procedure the 64 - Ncf, where Ncf is the number of preambles reserved by the eNodeB for contention-free procedure, available preambles are further divided into two sets according to the amount of bits needed to be transmitted as message 3 (msg3 in Figure 12.9), that is, preambles for small size message 3, referred to as group A preambles, and preambles for large size message 3, referred to as group B preambles. Also the path loss is taken into account by the UE to avoid large size message 3 being granted for cases where transmission power limits the coverage. System information block 2 contains all parameters for PRACH resource selection. The UE randomly selects one of the available preambles from either group A or group B. Transmitting the Preamble Once RRC connection establishment is initiated by layer 3 of the UE and the UE has selected the preamble, the UE sends the preamble at first available random access occasion at power PreambleTX given by Eq. 12.1. For the first preamble attempt, the preamble transmission counter is 1. The preambleInitialReceivedTargetPower and powerRampingStep are parameters defined by the eNodeB parameter database and sent within system information block 2. The preambleInitialReceivedTargetPower defines the targeted preamble received power level at the eNodeB and the powerRampingStep is the power increase per each retransmitted preamble. LTE Small Cell Optimization DELTAPREAMBLE is a preamble format-specific power offset defined by [1]. Path loss is the UE-measured path loss based on filtered reference signal received power (RSRP) and reference signal transmission power indicated in system information block 2: Preamble Tx = min {PCMAX, preambleInitialReceivedTargetPower + DELTAPREAMBLE + PREAMBLETRANSMISSION_COUNTE - 1) powerRampingStep + PathLoss} (12.1) After the random access preamble is transmitted the UE monitors the PDCCH for random access response grant identified by the random acc