Lucent Technologies Inc.

Adrian Robert Flewitt

Martine Madelaine Herpers

Sudheer A Grandhi

Simon C Borst

Terry Si-Fong Cheng

Boris Dmitrievich Lubachevsky

Peter Christian Gunreben

Michael Soellner

Hans-Juergen Kettschau

Roland K Henter

The interference on the available communication frequencies is measured during an idle time slot over a first period of time at a first rate. The available frequencies are prioritized based on the interference measurements, and a list is formed of the frequencies having the lowest interference measurements. Interference measurements are made at a second rate, greater than the first rate, for a second period of time less than the first period. When a call is assigned, the interference level requirements for the call are given, and the carrier power level of the call is measured. The carrier-to-interference ratio of each frequency in the list is determined using the second interference measurements and the measured carrier power. The frequencies in the list meeting the interference level requirements for the call are then selected, and frequency hopping while serving the call is performed using the selected frequencies.

Method for frequency hopping in a TDMA wireless communication system

A method for providing adaptive neighbor cell lists for a cellular radio network. In cellular radio networks, handovers are used to hand over a call from one cell to another. To identify possible cells for handovers, neighbor cell lists are used for each cell containing information on neighboring cells. Due to system limitations these neighbor cell lists sometimes do not contain all available neighboring cells. The present invention overcomes this disadvantage by providing a method that allows adapting the neighbor cell lists according to the actual location of a mobile station and the actual reception conditions at the time the mobile station is operative. The method provides a first part of the neighbor cell list containing information on fixed neighbor cells, and it provides a second part of the neighbor cell list containing information on varying neighbor cells.

Cellular radio network

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Lechlade, United Kingdom

Adrian Robert Flewitt