| 摘要 |
The invention concerns implementation of data transmission in a mobile network including base transceiver stations (BTS) forming radio cells, mobile stations (MS) located in the areas of the radio cells and being in connection with the base transceiver stations over a radio path, and at least one base station controller (BSC), which through a transmission network is in connection with the base transceiver stations. In at least a part of the transmission network data is transmitted in an encrypted form. In order to achieve good data security in the transmission network and in order to achieve as easy processing as possible of the signals of the transmission network, the encryption is carried out in an internal card unit (TRU) of the base tansceiver station before framing of the bit flow to be transmitted to the transmission network. |
