A base station system configured to operate as part of a dual connectivity configuration in which a communication bearer between a core network and a user communication device is provided via a base station and a further base station, said base station comprising: means for establishing said communication bearer with said user communication device via a communication link over a base station to base station interface between said base station and said further base station, wherein said communication bearer comprises: a first part, in said further base station operating as a master base station of said dual connectivity configuration, where first processing is performed; and a second part, in said base station operating as a secondary base station of said dual connectivity configuration, where second processing is performed; and means for obtaining: i) first time information representing a time when said first processing with regard to a packet data convergence protocol, PDCP, started, in said further base station operating as the master base station, for a data packet communicated using said communication bearer; and ii) second time information representing a time when at least part of said data packet communicated using said communication bearer was acknowledged, in said base station operating as the secondary base station, by said user communication device; and means for determining a packet delay based on said obtained first time information and second time information, wherein said communication bearer is split, at said further base station operating as the master base station, into said first and second parts, and said base station is characterized in that said means for obtaining is operable to obtain the first time information by estimating a time when radio link control, RLC, processing started for said data packet in said base station operating as said secondary base station. means for establishing said communication bearer with said user communication device via a communication link over a base station to base station interface between said base station and said further base station, wherein said communication bearer comprises: a first part, in said further base station operating as a master base station of said dual connectivity configuration, where first processing is performed; and a second part, in said base station operating as a secondary base station of said dual connectivity configuration, where second processing is performed; and means for obtaining: i) first time information representing a time when said first processing with regard to a packet data convergence protocol, PDCP, started, in said further base station operating as the master base station, for a data packet communicated using said communication bearer; and ii) second time information representing a time when at least part of said data packet communicated using said communication bearer was acknowledged, in said base station operating as the secondary base station, by said user communication device; and a first part, in said further base station operating as a master base station of said dual connectivity configuration, where first processing is performed; and a second part, in said base station operating as a secondary base station of said dual connectivity configuration, where second processing is performed; and means for obtaining: i) first time information representing a time when said first processing with regard to a packet data convergence protocol, PDCP, started, in said further base station operating as the master base station, for a data packet communicated using said communication bearer; and ii) second time information representing a time when at least part of said data packet communicated using said communication bearer was acknowledged, in said base station operating as the secondary base station, by said user communication device; and i) first time information representing a time when said first processing with regard to a packet data convergence protocol, PDCP, started, in said further base station operating as the master base station, for a data packet communicated using said communication bearer; and ii) second time information representing a time when at least part of said data packet communicated using said communication bearer was acknowledged, in said base station operating as the secondary base station, by said user communication device; and means for determining a packet delay based on said obtained first time information and second time information, wherein said communication bearer is split, at said further base station operating as the master base station, into said first and second parts, and said base station is characterized in that said means for obtaining is operable to obtain the first time information by estimating a time when radio link control, RLC, processing started for said data packet in said base station operating as said secondary base station. said communication bearer is split, at said further base station operating as the master base station, into said first and second parts, and said base station is characterized in that said means for obtaining is operable to obtain the first time information by estimating a time when radio link control, RLC, processing started for said data packet in said base station operating as said secondary base station.