A method in a user equipment for determining a per carrier additional maximum power reduction needed by the user equipment in order to meet emission requirements for dual carrier operation of adjacent carriers in absence of shared scheduling information between the adjacent carriers, each carrier having an associated respective one of multiple different radio access technologies, the method comprising: determining a per carrier allowed additional maximum power reduction for each of the carriers in the absence of the shared scheduling information between the adjacent carriers, the determination for each of the carriers for use with the different radio access technologies including: identifying for that carrier a worst case allocation for the other carrier that produces a largest total allowed maximum power reduction necessary for meeting emission requirements relative to a maximum allowed total power, determining for that carrier the total allowed maximum power reduction relative to the maximum allowed total power using the worst case allocation, applying a predetermined partition of the maximum allowed total power to allocate a fraction of the maximum allowed total power to that carrier, where the predetermined partition is independent of the identified allocations, and determining for that carrier the per carrier additional maximum power reduction as a sum of the total allowed maximum power reduction and a negative of ten times a base ten logarithm of the fraction of the maximum allowed total power allocated to that carrier using the predetermined partition; and using the determined per carrier allowed additional maximum power reduction in connection with transmissions when operating in a particular one of the dual carriers corresponding to the associated radio access technology, wherein the predetermined partition includes a fixed partition, and wherein the fixed partition is based upon a carrier bandwidth ratio of each of the carriers, which are part of the dual carrier operation, that has the associated respective one of the multiple different radio access technologies. determining a per carrier allowed additional maximum power reduction for each of the carriers in the absence of the shared scheduling information between the adjacent carriers, the determination for each of the carriers for use with the different radio access technologies including: identifying for that carrier a worst case allocation for the other carrier that produces a largest total allowed maximum power reduction necessary for meeting emission requirements relative to a maximum allowed total power, determining for that carrier the total allowed maximum power reduction relative to the maximum allowed total power using the worst case allocation, applying a predetermined partition of the maximum allowed total power to allocate a fraction of the maximum allowed total power to that carrier, where the predetermined partition is independent of the identified allocations, and determining for that carrier the per carrier additional maximum power reduction as a sum of the total allowed maximum power reduction and a negative of ten times a base ten logarithm of the fraction of the maximum allowed total power allocated to that carrier using the predetermined partition; and identifying for that carrier a worst case allocation for the other carrier that produces a largest total allowed maximum power reduction necessary for meeting emission requirements relative to a maximum allowed total power, determining for that carrier the total allowed maximum power reduction relative to the maximum allowed total power using the worst case allocation, applying a predetermined partition of the maximum allowed total power to allocate a fraction of the maximum allowed total power to that carrier, where the predetermined partition is independent of the identified allocations, and determining for that carrier the per carrier additional maximum power reduction as a sum of the total allowed maximum power reduction and a negative of ten times a base ten logarithm of the fraction of the maximum allowed total power allocated to that carrier using the predetermined partition; and using the determined per carrier allowed additional maximum power reduction in connection with transmissions when operating in a particular one of the dual carriers corresponding to the associated radio access technology, wherein the predetermined partition includes a fixed partition, and wherein the fixed partition is based upon a carrier bandwidth ratio of each of the carriers, which are part of the dual carrier operation, that has the associated respective one of the multiple different radio access technologies.