Patent ID: 8923886

Claim:
A method in conjunction with positioning of a mobile terminal in a cellular telecommunication system, the method comprising: determining an end user's requested positioning accuracy for the positioning of said mobile terminal, by receiving a first control message in a node of said cellular telecommunication system, said first control message representing a request from said end user for a positioning report pertaining to said mobile terminal, and determining at least one accuracy code included in said first control message, wherein the or each determined accuracy code represents a radius of an uncertainty circle or an altitude; determining an estimated confidence value for the positioning of said mobile terminal; determining a required confidence value for said end user; producing a pre-scale value based on at least said estimated confidence value and said required confidence value, by analyzing said first control message to determine that a horizontal accuracy code is included therein and a vertical accuracy code is not included therein and, in response thereto, calculating said pre-scale value v PS as 1/sqrt(−2*log(1−C Required )), where C Required is the determined required confidence value; applying said pre-scale value to said requested positioning accuracy to obtain a pre-scaled requested positioning accuracy; and sending the pre-scaled requested positioning accuracy in said cellular telecommunication system towards said mobile terminal.