A radio base station comprising - a first radio module for radio communication with first radio communication devices assigned thereto, and - a second radio module for radio communication with second radio communication devices (2 - 10) assigned thereto, wherein the two radio modules have a coupling with each other, - the second radio module with the aid of the coupling is configured to influence the radio activity of the first radio module , and - the first radio module is designed to be influenced in terms of its radio activity, - wherein the second radio module is configured to communicate with electronic price indication signs as the second radio communication devices (2 - 10) assigned thereto, and - wherein during the communication of the second radio module with the electronic price indication signs (2 - 10) a time slot communication method is used in which in a repeating sequence a number of time slots (Z1 - ZN) of identical time slot duration (DS) per time slot cycle are available for communication, wherein each time slot (Z1 - ZN) is characterised by a distinct time slot symbol (ZS1 - ZSN), and wherein the second radio module always at the start of every time slot duration (DS) sends a synchronisation data signal (SD) having the respective time slot symbol (ZS1 - ZSN) so that the price indication sign assigned to the respective time slot (Z1 - ZN) can, during a receiving duration (DE), during which the assigned price indication sign has left its sleep state (S) and is in the ready to receive active state (E), receive the time slot signal (ZS1 - ZSN) to determine its synchronous state, - wherein the radio activity of the first radio module is always influenced by way of the coupling in such a way that during a mute time span (SSD), during which the synchronisation data signal (SD) appears, the first radio module is muted, wherein the mute time span (SSD) overlaps the receiving time duration (DE) with a lead time (S1) and a lag time (S2). - a first radio module for radio communication with first radio communication devices assigned thereto, and - a second radio module for radio communication with second radio communication devices (2 - 10) assigned thereto, wherein the two radio modules have a coupling with each other, - the second radio module with the aid of the coupling is configured to influence the radio activity of the first radio module , and - the first radio module is designed to be influenced in terms of its radio activity, - wherein the second radio module is configured to communicate with electronic price indication signs as the second radio communication devices (2 - 10) assigned thereto, and - wherein during the communication of the second radio module with the electronic price indication signs (2 - 10) a time slot communication method is used in which in a repeating sequence a number of time slots (Z1 - ZN) of identical time slot duration (DS) per time slot cycle are available for communication, wherein each time slot (Z1 - ZN) is characterised by a distinct time slot symbol (ZS1 - ZSN), and wherein the second radio module always at the start of every time slot duration (DS) sends a synchronisation data signal (SD) having the respective time slot symbol (ZS1 - ZSN) so that the price indication sign assigned to the respective time slot (Z1 - ZN) can, during a receiving duration (DE), during which the assigned price indication sign has left its sleep state (S) and is in the ready to receive active state (E), receive the time slot signal (ZS1 - ZSN) to determine its synchronous state, - wherein the radio activity of the first radio module is always influenced by way of the coupling in such a way that during a mute time span (SSD), during which the synchronisation data signal (SD) appears, the first radio module is muted, wherein the mute time span (SSD) overlaps the receiving time duration (DE) with a lead time (S1) and a lag time (S2). <EOS>