A method for calculating an indication of power of a received radio signal, said method comprising, by a processing circuitry: receiving a plurality of logarithmic values, wherein the logarithmic values represent in logarithmic domain a sequence of measurements of power of the received radio signal; determining an average received power based on the plurality of logarithmic values; wherein said determining comprises: summing the plurality of logarithmic values, wherein a sum of a first and a second logarithmic value is calculated by determining the largest value of the first and the second logarithmic values and adding a rest value to the determined largest value, wherein the rest value is based on a difference between the first and the second logarithmic values and is determined by a look-up in a table and is approximated to zero if the difference between the first and the second logarithmic values is larger than a set threshold; wherein summing of the plurality of logarithmic values is performed by a recursive procedure including a plurality of summations of first and second logarithmic values, wherein the first and the second logarithmic value in individual summations of the recursive procedure represent a first and a second number of power measurements, respectively, wherein the second number of power measurements is equal or larger than the first number of power measurements, and the recursive procedure is such that a risk of introducing an error is restricted by an expression μ L σ 2 α − 2 T α + 2 2 T < − 3, wherein μ is a mean value and σ 2 is a variance of squared values of the first and second power measurements, L is the first number of power measurements, α is a factor relating the second number of power measurements to the first number of power measurements, and T is the set threshold. receiving a plurality of logarithmic values, wherein the logarithmic values represent in logarithmic domain a sequence of measurements of power of the received radio signal; determining an average received power based on the plurality of logarithmic values; wherein said determining comprises: summing the plurality of logarithmic values, wherein a sum of a first and a second logarithmic value is calculated by determining the largest value of the first and the second logarithmic values and adding a rest value to the determined largest value, wherein the rest value is based on a difference between the first and the second logarithmic values and is determined by a look-up in a table and is approximated to zero if the difference between the first and the second logarithmic values is larger than a set threshold; wherein summing of the plurality of logarithmic values is performed by a recursive procedure including a plurality of summations of first and second logarithmic values, wherein the first and the second logarithmic value in individual summations of the recursive procedure represent a first and a second number of power measurements, respectively, wherein the second number of power measurements is equal or larger than the first number of power measurements, and the recursive procedure is such that a risk of introducing an error is restricted by an expression μ L σ 2 α − 2 T α + 2 2 T < − 3, wherein μ is a mean value and σ 2 is a variance of squared values of the first and second power measurements, L is the first number of power measurements, α is a factor relating the second number of power measurements to the first number of power measurements, and T is the set threshold. summing the plurality of logarithmic values, wherein a sum of a first and a second logarithmic value is calculated by determining the largest value of the first and the second logarithmic values and adding a rest value to the determined largest value, wherein the rest value is based on a difference between the first and the second logarithmic values and is determined by a look-up in a table and is approximated to zero if the difference between the first and the second logarithmic values is larger than a set threshold; wherein summing of the plurality of logarithmic values is performed by a recursive procedure including a plurality of summations of first and second logarithmic values, wherein the first and the second logarithmic value in individual summations of the recursive procedure represent a first and a second number of power measurements, respectively, wherein the second number of power measurements is equal or larger than the first number of power measurements, and the recursive procedure is such that a risk of introducing an error is restricted by an expression μ L σ 2 α − 2 T α + 2 2 T < − 3, wherein μ is a mean value and σ 2 is a variance of squared values of the first and second power measurements, L is the first number of power measurements, α is a factor relating the second number of power measurements to the first number of power measurements, and T is the set threshold.