Telefonaktiebolaget Lm Ericsson (publ)

Nec Corporation

Huawei Technologies Co., Limited

Nortel Networks Corporation

Nokia Solutions and Networks Gmbh & Co. Kg

Thomas Östman

Fredrik Gunnarsson

Torbjörn Wigren

Bo Hagerman

Toshifumi Sato

Jacob Österling

Ning He

Carola Faronius

Hizuru Nawata

Ulf Skärby

Eric Georgeaux

Gunnar Peters

Björn Johannisson

Babak Alamshahi

Kenichiro Yagawa

Peter Merz

Patrick Lagrange

Bernd Hassler

Torbjörn Aarflot

Lawrence Sarresh

Hans KRÖNER

Werner Korte

The present invention relates to a radio base station (RBS) (). The RBS comprises a first radio unit (RU) () and a second RU (). The RBS is configured such that said first and second RUs will use the same scrambling or cell identity code for communication with a wireless communication terminal () such that the wireless communication terminal will regard the first and second RUs as relating to the same cell of the RBS. The invention also relates to a communication system () comprising the RBS, as well as to a use of the RBS for performing an internal handover, after UL measurements, of the communication terminal from the first RU to the second RU, and a method of arranging the RBS.

Radio base station and methods thereof

A transmitter () for a code division multiple access radio access network intelligently preconditions a channel-merged signal which is applied to its amplifier () so that the amplifier does not experience, e.g., precipitous power changes. The transmitter () comprises an amplifier () for amplifying the channel-merged signal at a signal output power; a detector () for performing detection of when output power of the channel-merged signal is about to change by a specified amount; and, a noise inserter () for adding a noise signal to the channel-merged signal in dependence upon the detection. Insertion of the noise smoothes an edge of the power change curve and thereby averts stress for the amplifier.

Transmitter with intelligent preconditioning of amplifier signal

The present invention is related to a Rake receiver (R) for receiving a radio signal and to a searcher (S, S) for estimating the delay profile of one or more radio links. The searcher includes means for estimating delay profiles in separate windows. The searcher is arranged for being switched into a single window mode or alternatively into a multiple window mode. In single window mode the delay profiles of separate radio links are estimated in the windows, while in multiple window mode two or more windows are allocated adjacent in time for estimating the delay profile of the same radio link. Thereby, the use of the resources of the searcher can be adapted to the radio environments in which the searcher will be used. The Rake receiver comprises fingers that are grouped into two sets. Within a set of fingers the propagation paths are time aligned. The output from the two set of fingers are time aligned and then combined.

Radio receiver and channel estimator

A base station () included in a radio access network of a telecommunications system has two diversity antennas (A,B) for a cell/carrier utilized in a sector served by the base station which are respectively involved in transmission of two branches of a radio link signal of the cell/carrier between the base station and a user equipment unit (). Two branches of signal processing hardware respectively process the two branches of the radio link signal to yield two respective processed branches of the radio link signal. A rake receiver () measures the delay difference between the two processed branches of the radio link signal, and uses the measured delay difference for various purposes. For example, some embodiments of the invention use the delay difference between the two branches as measured by the rake receiver to compensate for a delay difference which exists between the two processed branches of the radio link signal. When measuring the delay difference between the two branches of an uplink radio signal, a rake receiver () at the radio base station is employed. On the other hand, when measuring the delay difference between the two branches of a downlink radio signal, a rake receiver () at test user equipment unit (T) is employed.

Diversity branch delay alignment in radio base station

An apparatus and method are described in which a corrected signal-to-interference ratio (SIR) is determined in a cellular telephone receiver. First the estimated signal strength at the receiver is measured, then the estimated interference level is measured. The signal strength and the interference values are separately corrected in accordance with an algorithm. Thereafter, a corrected SIR value is obtained by dividing the corrected signal strength and the corrected interference values.

Correction of received signal and interference estimates

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Spånga, Sweden

Thomas Östman