A method for communicating between a network (105, 115) and a mobile terminal, the method comprising: receiving, by the mobile terminal from the network, at least one configuration parameter related to system information prior to establishing a Radio Resource Control, RRC, connection with the network; and transmitting, by the mobile terminal to the network, an RRC connection request message for establishing the RRC connection with the network, wherein the at least one configuration parameter comprises a system frame number, SFN, radio first layer, L1, parameters, and radio access channel, RACH, parameters, wherein the RRC connection request message includes a Message Authentication Code for data Integrity, MAC-I, for verifying correctness of the at least one configuration parameter, wherein the MAC-I is calculated by using an RRC message, an RRC integrity key, an identification of the at least one configuration parameter to be verified, other parameters for building the MAC-I and a checksum value, wherein the checksum value, which is calculated at the mobile terminal using the at least one configuration parameter, is a unique identifier for identifying the at least one configuration parameter. wherein the other parameters for building the MAC-I relate to an integrity key, a Count-I, a fresh, and a direction, wherein the verification of the correctness of the at least one configuration parameter is performed only after a new reading or changing of the system information, if an initial RRC connection is not established because the at least one configuration parameter is not verified, erasing the at least one un-verified configuration parameter and re-reading the system information; and if the initial RRC connection is not established after re-reading the system information, triggering a cell search for other suitable cell with a lower transmission power level. receiving, by the mobile terminal from the network, at least one configuration parameter related to system information prior to establishing a Radio Resource Control, RRC, connection with the network; and transmitting, by the mobile terminal to the network, an RRC connection request message for establishing the RRC connection with the network, wherein the at least one configuration parameter comprises a system frame number, SFN, radio first layer, L1, parameters, and radio access channel, RACH, parameters, wherein the RRC connection request message includes a Message Authentication Code for data Integrity, MAC-I, for verifying correctness of the at least one configuration parameter, wherein the MAC-I is calculated by using an RRC message, an RRC integrity key, an identification of the at least one configuration parameter to be verified, other parameters for building the MAC-I and a checksum value, wherein the checksum value, which is calculated at the mobile terminal using the at least one configuration parameter, is a unique identifier for identifying the at least one configuration parameter. wherein the other parameters for building the MAC-I relate to an integrity key, a Count-I, a fresh, and a direction, wherein the verification of the correctness of the at least one configuration parameter is performed only after a new reading or changing of the system information, if an initial RRC connection is not established because the at least one configuration parameter is not verified, erasing the at least one un-verified configuration parameter and re-reading the system information; and if the initial RRC connection is not established after re-reading the system information, triggering a cell search for other suitable cell with a lower transmission power level.