Patent ID: 8125917
Filing Date: 2012-02-28
Classification: H04W

Abstract:
1. A method of optimising radio frequency field strength in a radio communications network, the network comprising a wireless access point arranged to transmit a signal at a configurable power level, the radio frequency field strength being dependent on the transmitted signal power level, and the network further comprising a plurality of sensors, each sensor having a defined location with respect to a designated zone of wireless coverage, the method comprising: receiving at each sensor the signal transmitted from the wireless access point; measuring the power of said received signal at each sensor, the received signal power being dependent on the radio frequency field strength at the location of the sensor; and controlling transmitted power from the wireless access point in dependence on a difference between said power measured at each sensor and an expected level of power at each sensor, said expected level of power at each sensor being a function of the location of each sensor with respect to said designated zone of wireless coverage; controlling the transmitted power from the wireless access point in dependence on minimizing an objective function, in which the objective function comprises contributions from two or more sensors selected from a group comprising: in which at least one of said sensors is located at the edge of or outside the designated zone of wireless coverage.