A data transmission system comprises a first device and a second device and a duplex data transmission connection therebetween. The first device sends to the second device user data on a data channel and control information on a control channel. The transmission is arranged in frames that comprise a...http://www.google.de/patents/US6603773?utm_source=gb-gplus-sharePatent US6603773 - Method and system for controlling the transmission power of certain parts of a radio transmission
