A method of managing transmissions of a user equipment, UE, wherein the UE is an intelligent transport system, ITS, station, and the UE is configured with a maximum output power, wherein the UE operates in a normal mode outside a protection zone, wherein the normal mode is associated with a maximum power reduction, MPR, that specifies an allowed decrease in the maximum power to be transmitted to enable the UE to operate in a linear region and, an additional maximum power reduction, A-MPR, to comply with regional regulatory emission requirements or, a coexistence mode inside a protection zone, wherein the coexistence mode is associated with transmission requirements to avoid interference to CEN DSRC, wherein the protection zone is associated with a tolling zone surrounding a road side unit, RSU, the method further comprising: determining, by a processor of the UE, that the UE is in a protection zone and to operate in a coexistence mode, wherein the coexistence mode applies additional transmission requirements on the UE, the additional transmission requirements being associated with coexistence requirements of the coexistence mode, the additional transmission requirements including one or more transmit emission limit requirements and one or more maximum transmit power requirements, enabling coexistence with CEN DSRC in the protection zone; identifying, by the processor and based on being in the protection zone and the coexistence mode, the one or more transmit emission limit requirements to be met, wherein the emission limit requirements are an emission limit on a particular frequency range; identifying, by the processor and based on being in the protection zone and the coexistence mode, the one or more maximum transmit power requirements to be met, wherein the maximum transmit power requirements are based one or more of the output power levels, levels, time on, and time off as defined by the coexistence mode; determining, by the processor and based on the one or more transmit emission limit requirements and the one or more maximum transmit power requirements, an allowed maximum transmit output power reduction or backoff that can be utilized by the UE to meet the one or more transmit emission limit requirements and the one or more maximum transmit power requirements; and configuring, by the processor, the transmit output power, at which the UE can meet the one or more transmit emission limit requirements and the one or more maximum transmit power requirements, wherein configuring the transmit output power includes using a total backoff, wherein the total backoff is the sum of the MPR, the A-MPR, and the allowed maximum transmit output power reduction or backoff. determining, by a processor of the UE, that the UE is in a protection zone and to operate in a coexistence mode, wherein the coexistence mode applies additional transmission requirements on the UE, the additional transmission requirements being associated with coexistence requirements of the coexistence mode, the additional transmission requirements including one or more transmit emission limit requirements and one or more maximum transmit power requirements, enabling coexistence with CEN DSRC in the protection zone; identifying, by the processor and based on being in the protection zone and the coexistence mode, the one or more transmit emission limit requirements to be met, wherein the emission limit requirements are an emission limit on a particular frequency range; identifying, by the processor and based on being in the protection zone and the coexistence mode, the one or more maximum transmit power requirements to be met, wherein the maximum transmit power requirements are based one or more of the output power levels, levels, time on, and time off as defined by the coexistence mode; determining, by the processor and based on the one or more transmit emission limit requirements and the one or more maximum transmit power requirements, an allowed maximum transmit output power reduction or backoff that can be utilized by the UE to meet the one or more transmit emission limit requirements and the one or more maximum transmit power requirements; and configuring, by the processor, the transmit output power, at which the UE can meet the one or more transmit emission limit requirements and the one or more maximum transmit power requirements, wherein configuring the transmit output power includes using a total backoff, wherein the total backoff is the sum of the MPR, the A-MPR, and the allowed maximum transmit output power reduction or backoff.