Patent ID: 7826864

Claim:
A method for deriving a power measurement summation for use in a mobile telecommunications system, the system comprising a network of a plurality of cells and at least one user equipment device, the method comprising, in the user equipment: receiving for each cell in a group of cells a power measurement, said power measurement being of a logarithmic scale; determining from data stored in the user equipment a corresponding value for each power measurement on a linear scale of measurement; summing the corresponding values; for each cell: deriving a unit parameter dependent upon the power measurement, deriving a factor parameter dependent upon the power measurement, and deriving a value parameter dependent upon the unit parameter; having derived the unit, factor and value parameters for each cell, adjusting the value parameter and the associated factor parameter for each cell to cause the factor parameters for each cell to become the same; summing the adjusted value parameters for the cells to generate a group value parameter and an associated group factor parameter; adjusting the group value parameter and the group factor parameter meter to cause the group value parameter to fall within a given range; deriving a group unit parameter dependent upon the adjusted group value parameter; and deriving a power measurement summation dependent on the group unit parameter and the adjusted group factor parameter; wherein the power measurement summation is of the form 10 · Log ⁡ ( 1 / ∑ i = 1 N A ⁢ 1 / M i ) where N A is the number of cells to be summed and M i is the power ratio of a cell and the unit parameter is derived by the following formula: unit=d modulus 10 and the factor parameter is derived by the following formula: factor=truncate( −d /10) where d is the power for a cell in decibels.