Patent ID: 7333441
Filing Date: 2008-02-19
Classification: H04W

Abstract:
1. A method for controlling packet switched data traffic in digital cellular communication systems, in which a cell reselection is forced, said cell reselection being controlled by network control units of mobile stations engaged in packet switched calls and identified in a search step in which the control units evaluate path loss levels of signals relevant to communication of the mobile stations engaged in these calls with both a base station of a respective serving cell and base stations of a plurality of cells contiguous to a serving cell, said method comprising the steps of: a) jointly determining, for each one of the mobile stations in a involved cell, at least a first and a second parameter related to path loss for both communication with the base station of the serving cell and communication with the base stations of said plurality of contiguous cells; b) including mobile stations for which both of said parameters indicate a degradation of communication with the base station of the serving cell and a good quality of communication with a base station of at least a contiguous cell, into a list candidates mobile stations to receive a reselection command from said control units; c) associating, with each candidate station in said list, an identity of one or more contiguous cells identified as possible target cell or cells for the station in step b); and d) forcing a reselection of a candidate mobile station towards one of the contiguous cells which supports packet switched service and has an occupation level of radio resources involved in packet switched traffic not higher than a first threshold, set by a network operator and typical of the cell; wherein the search is enabled in a cell by either: