Synchronization

[0026]Let us take a closer look at FIG. 1, which illustrates the structure of a GSM based radio system. FIG. 1 is a simplified block diagram describing the most important radio system parts at network element level and the interfaces between them. The structure and operation of the network elements are not described in detail, since they are commonly known.

[0027]In FIG. 1, a core network CN 100 describes the radio access technology in a telecommunication system. A first radio system, i.e. a radio access network 130, and a second radio system, i.e. a base station system BSS 160, describe the radio systems. In addition, the Figure shows user equipment UE 170. The term UTRAN refers to the UMTS Terrestrial Radio Access Network, meaning that the radio access network 130 is implemented using Wideband Code Multiple Access WCDMA. The base station system 160 is implemented using Time Division Multiple Access TDMA.

[0028]In general, such a definition may also be presented that the radio system is