Abstract: In a telecommunications network wherein a location area contains GSM cells having adjacent or neighboring UTMS cells, a dedicated procedure is employed to download information about a UTMS cell to a mobile station. After entering the location area, the mobile is notified of the presence of the UTMS cell. In response to the notice, the mobile is operated to acquire specified information about the UTMS cell from the network, such as frequency and scrambling code combinations, radio access bearer configuration, and information pertaining to intersystem cell selection.

Abstract: The invention relates to a method and apparatus for channel hopping between mobile stations (MS1-MS3) and a base station (BS1) in a radio communications system. A channel allocation means (211) within the base station (BS1) generates channel hopping sequences that are transmitted via a control channel (SACCH) to hopping sequence lists (204-206) in the mobile stations (MS1-MS3). The hopping sequences are also transmitted to corresponding hopping sequence lists (201-203) in the base station (BS1). A channel hopping sequence is divided into a number of sequence intervals (Ti) corresponding to the time between two adjacent channel hops within a channel hopping sequence. In the channel allocation means (211) the attenuation (&dgr;) of the connections (F1-F3) and the interference (I(channel,t)) of the channels are continuously being observed within each sequence interval (Ti).