A method for performing a random access procedure by a user equipment, UE, in a dual connectivity, DC, with a master evolved node b, MeNB, and a secondary eNB, SeNB, in a wireless network, the method comprising: performing a random access, RA, procedure on a Primary Cell, PCell, for a master cell group, MCG, of the MeNB; receiving , from the MeNB, an RRC connection reconfiguration message for addition or modification of at least one secondary cell, SCell, for a SCell group, SCG associated with the SeNB provided with PUCCH configuration; performing a RA procedure on the at least one SCell, for the SCG of the SeNB associated with at least one second frequency; and transmitting, to the at least one SCell for the SCG of the SeNB, uplink data, wherein performing the RA procedure on the at least one SCell for the SCG of the SeNB comprises: transmitting a RA preamble on a physical random access channel, PRACH, to the at least one SCell for the SCG of the SeNB; receiving a random access response, RAR, message including an uplink grant, uplink timing advance information and a temporary Cell Radio Network Temporary Identifier, C-RNTI, from the at least one SCell for the SCG of the SeNB; and sending a request message based on the uplink grant to the at least one SCell for the SCG of the SeNB; and receiving a contention resolution message using the temporary C-RNTI, wherein the RA procedure on the at least one SCell for the SCG of the SeNB is initiated by the UE. performing a random access, RA, procedure on a Primary Cell, PCell, for a master cell group, MCG, of the MeNB; receiving , from the MeNB, an RRC connection reconfiguration message for addition or modification of at least one secondary cell, SCell, for a SCell group, SCG associated with the SeNB provided with PUCCH configuration; performing a RA procedure on the at least one SCell, for the SCG of the SeNB associated with at least one second frequency; and transmitting, to the at least one SCell for the SCG of the SeNB, uplink data, wherein performing the RA procedure on the at least one SCell for the SCG of the SeNB comprises: transmitting a RA preamble on a physical random access channel, PRACH, to the at least one SCell for the SCG of the SeNB; receiving a random access response, RAR, message including an uplink grant, uplink timing advance information and a temporary Cell Radio Network Temporary Identifier, C-RNTI, from the at least one SCell for the SCG of the SeNB; and sending a request message based on the uplink grant to the at least one SCell for the SCG of the SeNB; and transmitting a RA preamble on a physical random access channel, PRACH, to the at least one SCell for the SCG of the SeNB; receiving a random access response, RAR, message including an uplink grant, uplink timing advance information and a temporary Cell Radio Network Temporary Identifier, C-RNTI, from the at least one SCell for the SCG of the SeNB; and sending a request message based on the uplink grant to the at least one SCell for the SCG of the SeNB; and receiving a contention resolution message using the temporary C-RNTI, wherein the RA procedure on the at least one SCell for the SCG of the SeNB is initiated by the UE. <EOS>