AN IMPROVED METHOD AND ARRANGEMENT FOR MANAGING CELL RESELECTION IN A TERMINAL FOR A CELLULAR SYSTEM

摘要

The object of the invention is an improved method and arrangement for controlling the cell reselection made by a terminal of a cellular radio system. Particularly the invention relates to cell reselection in a situation where the terminal is connected to a special service, such as GPRS service (General Packet Radio Service) provided by the current cell. An essential idea of the invention is that the base station in advance transmits to the terminal information about whether the terminal may try cell reselection when required. This information is most advantageously transmitted in the signalling message of a certain service, such as in the signalling message of the GPRS service. Thanks to the invention a terminal connected to a certain service obtains information about whether it may directly change the serving base station to another base station offering a corresponding service, without temporarily accessing the signalling function of a lower level system. The invention facilitates the cell reselection to be focused so that the loading on the terminal and on the radio signalling, which is caused by the measurement of any new cells and message transmission, is as low as possible.