Abstract: An apparatus (10) comprising means for: enabling testing of at least one user equipment (110, 12) over a plurality of radio frames by: determining (202), for at least one candidate position in a current radio frame, if one or more signals are to be transmitted to the at least one user equipment, based, at least in part, on one or more probabilities associated with the at least one candidate position in the current radio frame; if it is determined, for at least one candidate position in the current radio frame, that one or more signals are to be transmitted to the at least one user equipment, transmitting (204) one or more signals to the at least one user equipment using the at least one candidate position in the current radio frame; if it is determined, for at least one candidate position in the current radio frame, that one or more signals are not be transmitted to the at least one user equipment, determining (206) if a maximum number of transmission failures has occurred, wherein a transmission failure is d

Abstract: A battery system, which is robust for mobile use and fulfils both the mechanical and thermal and electrical demands on a mobile, portable battery system, which are configured to be used in a flexible manner. The battery system also includes battery modules which in each case have at least one battery cell and one electronic module, at least one string housing, wherein the battery modules are arranged in the at least one string housing, and an external housing, wherein the at least one string housing is arranged in the external housing.