Patent ID: 6985471
Filing Date: 2006-01-10
Classification: H04B,H04J

Abstract:
1. A method for transmitting data from a radio network subsystem over a radio link to user equipment in a mobile telephone system, the method comprising: the radio network subsystem transmitting a dedicated physical channel to the user equipment, which dedicated physical channel includes a dedicated physical control channel and a dedicated physical data channel, the dedicated physical channel being formed by frames to be transmitted to the radio link; during transmission, the radio network subsystem spreading each channel with a spreading code, the spreading factor of that spreading code determining the data transmission rate, a spreading code to be used in normal situations being reserved for the radio link; and in a special situation, spreading at least one frame of the dedicated physical data channel with a shared spreading code, which shared spreading code being shorter than the spreading code used in normal situations, wherein the shared spreading code is shared by time division between the dedicated physical data channels of at least two different radio links and, wherein, in special situations, the user equipment functions in slotted mode, in which the user equipment measures the received power of other frequencies of adjacent base transceiver stations for part of the duration of the frame transmitted normally by the radio network subsystem, and during the rest of the duration of the frame, the radio network subsystem transmits a shortened frame using a shared spreading code to spread the shortened frame.