A user equipment, UE, for receiving a radio resource control, RRC, message, comprising: a processor; and memory in electronic communication with the processor, wherein instructions stored in the memory are executable to: receive, from a base station, an RRC connection reconfiguration message including secondary cell group, SCG, configuration parameters for an addition of an SCG for dual-connectivity operation, start a timer, perform a random access procedure on a primary secondary cell, PSCell, upon the addition of the SCG, determine whether the random access procedure was not successfully completed in time based on the timer, and wherein a first MAC entity is mapped to a master cell group, MCG, and a second MAC entity is mapped to the SCG, and wherein the user equipment is configured such that for the first MAC entity, a random access procedure can be initiated by a PDCCH order or by a MAC sublayer itself, and such that, for the second MAC entity, a random access procedure can be initiated by a PDCCH order or by the MAC sublayer itself, the user equipment further being configured such that, if a MAC entity for which a random access procedure is initiated is the second MAC entity, the random access procedure can also be initiated by an RRC order, the RRC connection reconfiguration message is exchanged via the MCG, the MCG comprises a primary cell, PCell, and no, one, or more secondary cell(s), and the SCG comprises the PSCell, and no, one, or more secondary cell(s). a processor; and memory in electronic communication with the processor, wherein instructions stored in the memory are executable to: receive, from a base station, an RRC connection reconfiguration message including secondary cell group, SCG, configuration parameters for an addition of an SCG for dual-connectivity operation, start a timer, perform a random access procedure on a primary secondary cell, PSCell, upon the addition of the SCG, determine whether the random access procedure was not successfully completed in time based on the timer, and wherein a first MAC entity is mapped to a master cell group, MCG, and a second MAC entity is mapped to the SCG, and wherein the user equipment is configured such that for the first MAC entity, a random access procedure can be initiated by a PDCCH order or by a MAC sublayer itself, and such that, for the second MAC entity, a random access procedure can be initiated by a PDCCH order or by the MAC sublayer itself, the user equipment further being configured such that, if a MAC entity for which a random access procedure is initiated is the second MAC entity, the random access procedure can also be initiated by an RRC order, the RRC connection reconfiguration message is exchanged via the MCG, the MCG comprises a primary cell, PCell, and no, one, or more secondary cell(s), and the SCG comprises the PSCell, and no, one, or more secondary cell(s). receive, from a base station, an RRC connection reconfiguration message including secondary cell group, SCG, configuration parameters for an addition of an SCG for dual-connectivity operation, start a timer, perform a random access procedure on a primary secondary cell, PSCell, upon the addition of the SCG, determine whether the random access procedure was not successfully completed in time based on the timer, and wherein a first MAC entity is mapped to a master cell group, MCG, and a second MAC entity is mapped to the SCG, and wherein the user equipment is configured such that for the first MAC entity, a random access procedure can be initiated by a PDCCH order or by a MAC sublayer itself, and such that, for the second MAC entity, a random access procedure can be initiated by a PDCCH order or by the MAC sublayer itself, the user equipment further being configured such that, if a MAC entity for which a random access procedure is initiated is the second MAC entity, the random access procedure can also be initiated by an RRC order, the RRC connection reconfiguration message is exchanged via the MCG, the MCG comprises a primary cell, PCell, and no, one, or more secondary cell(s), and the SCG comprises the PSCell, and no, one, or more secondary cell(s).