Telefonaktiebolaget Lm Ericsson (publ)

Gunnar Persson

Benny Lennartson

Gerlach Spee

Lars-Göran Lund

Methods and arrangements () in a network node (), for scrambling a timing advance value, to be received by a mobile station (). The method comprises receiving () a signal from the mobile station (), estimating () the timing advance value for the mobile station (), determining () an offset value to be added to the estimated timing advance value, computing () a scrambled timing advance value by adding the determined offset value to the estimated timing advance value, and transmitting () the scrambled timing advance value, to be received by the mobile station (). Also, methods and arrangements () in a mobile station (), and methods and arrangements () in a database () are disclosed.

Methods and arrangements for scrambling a timing advance value in a wireless communication system

The present invention relates to an analog predistorter () having a tunable amplitude () and/or phase () expansion. The predistorter () includes a coupler () having an input port (), an output port (), a first () and a second () coupled port separated by 90 degrees. A first compensation circuit (A) is connected to the first coupled port () and comprises a first combination (A) of linear (A) and nonlinear (A) circuit elements and a first impedance adjusting unit (A) for adjusting the impedance seen by the nonlinear circuit element (A). A second compensation circuit (B) is connected to the second coupled port () and comprises a second combination (B) of linear (B) and nonlinear (B) circuit elements a second impedance adjusting unit (B) for adjusting the impedance seen by said nonlinear circuit element (B). By adjusting the impedances seen by the nonlinear circuit elements (IA,B) the amplitude () and/or phase () expansion of the predisorter () are tuned.

Tunable predistorter

A base station, as is conventional, directs mobile stations within its cell to make measurements on channels used by neighbouring cells. The base station also directs the mobile stations to make measurements on an additional channel not used by a neighbouring cell. The additional channel is changed regularly. Measurements made on the additional channel are useful when assessing the potential impact of changes to the frequency reuse plan.

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Vikingstad, Sweden

Gunnar Persson