Abstract: The present invention relates to radio base station and to a related method for supporting positioning. The method includes measuring a relative time of arrival of two reference signals, where a first of the two reference signals is transmitted from a first neighboring radio base station. The method also includes transmitting the measured relative time of arrival to a positioning node, connected to the radio base station and the first neighboring radio base station.

Abstract: The present invention relates to a method for controlling performance in a radio base station communicating in a Time Division Duplex (TDD) mode in a cellular network. The radio base station has a transceiver comprising a transmitter part, a receiver part, and an antenna, the antenna being alternately connectable to the transmitter part and the receiver part. The method comprises: estimating, at the receiver part, a leakage signal in the receiver part, the leakage signal originating from a local oscillator of the transmitter part; and removing, at the receiver part, the estimated leakage signal from a received uplink signal. The present invention also relates to a corresponding radio base station.

Abstract: Controlling performance in a Time Division Duplex (TDD) radio node is provided. The TDD radio node having multiple parallel branches and antennas for radio transmission of signals propagating through a transmit chain in each of the branches before emission from the antennas. A signal generator generates a signal that propagates through each branch. A signal tapper taps the signal from each of the branches after the transmit chain. A control unit determines a timing of the tapped signal from each of the branches, and monitors timing alignment of the branches based on the determined timing of tapped signals. If it is discovered that there is a timing misalignment between the branches that exceeds a preset acceptable limit, a transmission delay can be adjusted for at least one of the branches to reduce the misalignment.

Abstract: A method in a first network node (105) for estimating a first timing offset difference between a first timing offset of a first base station and a second timing offset of a second base station, is provided. The first network node (105) receives Uplink Time Difference Of Arrival, UTDOA, measurements. The UTDOA measurements relate to a first UTDOA time difference. The first network node (105) further receives Observed Time Difference Of Arrival, OTDOA, measurements. The OTDOA measurements relate to a first measured OTDOA time Receive UTDOA difference. The first network node estimates a first timing offset difference between a first timing offset of the first base station and a second timing offset of the second base station based on the first UTDOA time difference and the first measured OTDOA time difference.

Abstract: A base station subsystem (1000), a TMA part (100) and a RBS part (150) of a communication system employing TDD; and respective methods are provided for synchronizing the RBS part of the base station subsystem (1000) with the TMA part (100) The RBS part (150) comprises an RBS modem (160) adapted to generate a switch signal comprising a switch command word, and to further send the switch signal to a TMA modem (110).The TMA modem (110) is adapted to demodulate the switch signal and to compare the switch command word with switch command words stored in a register. When any of the switch command words in the register (111) matches the switch command word of the demodulated switch signal, the TMA modem (110) is configured to generate a control signal for controlling a switch of the TMA part for synchronizing the RBS part (150) with the TMA part.

Abstract: The present invention relates to a method and a device for time synchronization of an RBS which has lost its GPS signal. The method in the time synchronization device comprises retrieving from the first radio base station a first timing advance value (710) used by the user equipment to adjust its transmission timing before the handover, and a measurement of a reception timing (720) of a random access preamble. The random access preamble is transmitted from the user equipment to the second radio base station during synchronization. The method also comprises retrieving (730) from the second radio base station a second timing advance value used by the user equipment to adjust its transmission timing after the handover, and determining (740) a time synchronization offset between the first and second radio base station based on the retrieved first timing advance value, the second timing advance value, and the measurement of the reception timing.

Abstract: A method (300) of and an equalizer (104-1, 104-2) for equalizing an RF filter (106-1, 106-2) supporting a frequency band by utilizing an antenna calibration path having the RF filter (106-1, 106-2) in a Node B (100) in a TDD system are provided. The method (300) comprises the steps of obtaining (302) an amplitude and phase response of a calibration signal having a frequency in the frequency band, stepwise changing (304) the frequency of the calibration signal, determining (306) a transfer function of the RF filter (106-1, 106-2), and equalizing (308) the RF filter (106-1, 106-2) based on the determined transfer function of the RF filter (106-1, 106-2).

Abstract: In a transmission scheme for transmitting data over a connection connecting a transmitting Main Unit and a receiving Radio Unit of a cellular radio system, where the transmitted data corresponds to user-plane data in the form of digital baseband data for different antenna-carriers, the digital signal is transmitted over the connection, e.g. a fiber, before spreading and combining is provided. The power and weight factor is transmitted separately with a few additional bits. Hereby, the Digital signal before spreading and combining is transmitted in the fiber instead of the combined multi-code signal.