Telefonaktiebolaget Lm Ericsson (publ)

Unwired Planet, LLC

Udo Wachsmann

Peter Schramm

Stefan Mueller-Weinfurtner

Mathias Pauli

Uwe Dettmar

Fabian Wenger

Steffen Reinhardt

Jörn Thielecke

Ralf Keller

Jörg Huschke

Dietmar Lipka

Wolfgang Stahl

Ralf Tonjes

Hui Li

Rainer Walter Bachl

Eric Sachse

Toni Viki Brkic

Georg Frank

G&ouml;ran Malmgren

Jamshid Khun-Jush

Eckhard Ohlmer

Karsten Brueninghaus

Stefan Davidsson

J&ouml;rn Thielecke

Steffen Reinhard

Shiau-He (Shawn) Tsai

Roger Walther

Kirsten Matheus

Stefan Müller-Weinfurtner

Stefan Mueller-weinfurtner

A technique for cancelling inter-cell or intra-cell interference in a cellular communication network is described. A method implementation of that technique performed in an interfered terminal comprises receiving a signal, wherein the received signal comprises an interfering signal destined to at least one further terminal different from the interfered terminal. In a next step, control information pertaining to the at least one further terminal is determined and the interfering signal is decoded based on the control information so as to generate decoded information. Then, the interfering signal is re-generated from the decoded information and the control information. Based on the re-generated signal the interfering signal is cancelled from the received signal.

Interference cancellation in a cellular communication network

A communication device () for communicating in accordance with a hybrid automatic repeat request protocol, the communication device () comprising a receiving unit () adapted for receiving a communication message including soft-bit values, the soft-bit values representing reliability information for received verification data verifying proper transmission of the communication message, a storage unit () adapted for storing the soft-bit values, and a storage management unit () adapted for dynamically managing storage of the soft-bit values in the storage unit () so that soft-bit values failing to fulfill at least one relevance criteria are not maintained in the storage unit ().

Dynamic HARQ buffer management

A technique for processing information in a wireless communication network is described. In a method in accordance with the technique, a signal encoded with a convolution code is received. The encoded signal comprises information and a check value. The encoded signal is decoded using a Viterbi algorithm to derive the information and the check value. The decoding includes computing a Viterbi state metric. A reliability parameter is then determined based on the Viterbi state metric. The information is selectively processed depending on both the check value and the reliability parameter.

Technique for processing encoded information in a wireless communication network

A technique for precoding a signal to be transmitted over a physical channel from a sender to a receiver is provided. A method includes receiving precoding information and applying precoding matrix at the sender based on the precoding information. The precoding information is received via a feedback mechanism from the receiver. The application of the precoding matrix results in a precoded signal for transmission over the physical channel. The precoding matrix enhances mutual information at the receiver.

Precoding technique

The invention relates to a technique for controlling a synchronization of a terminal device () with a wireless network, e.g. an LTE network, wherein data are transmitted as a continuous data signal on a radio interface () while being processed block-wise in the terminal (). A method embodiment of the technique for achieving at least a downlink () synchronization comprises establishing a time-address mapping (TAM,) indicative of an association of a reference time value of an internal clock () with a reference address in the reception data buffer (); determining an address of data samples representing the received data block in the reception data buffer () based on the time-address mapping; and initiating a block-wise reading of the data block from the reception data buffer () based on the determined address.

Technique for synchronizing a terminal device with a wireless network

A technique for determining in a fading channel environment a scaling factor for soft bit quantization is proposed. In a method realisation, the technique includes repeatedly determining an SNR value for the fading channel, calculating a weighted average based on a plurality of the SNR values, wherein weighting is performed such that contributions of extremal SNR values are attenuated, and determining the scaling factor for soft bit quantization dependent on the weighted average.

Technique for soft bit scaling

A technique for determining a frequency offset between components of a communication network based on a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence is described. A method implementation of this technique comprises a provision of a set of correlation signals at different frequencies, with each correlation signal being indicative of a specific frequency offset hypothesis and comprising the CAZAC sequence. Once a synchronization signal comprising the CAZAC sequence is received, this synchronization signal is correlated with each of the correlation signals to obtain a correlation result for each frequency offset hypothesis. In a next step, at least one of the frequency offset hypotheses is selected based on a comparison of the correlation results. The frequency offset may then be determined based on the at least one selected frequency offset hypothesis.

Technique for determining a frequency offset

The present invention concerns a method for estimating the time-dispersion of a channel comprising D subchannels, wherein one computes from a received signal a set of estimated Channel Transfer Factors (CTF's) &#x124;[&#x3bd;], where &#x3bd;(0&#x2266;&#x3bd;&#x2266;D) is the subchannel number, said method comprising a step of calculating, for a predetermined strictly positive integer d, a correlation factor Crepresenting the correlations, both in amplitude and in phase, between pairs &#x124;[&#x3bd;] and &#x124;[&#x3bd;+d] of said computed CTF estimates. By an appropriate choice of d, the time-dispersion resolution can be adapted to most prevalent channels. The correlation is optionally corrected according to the mean channel estimation signal-to-noise ratio. This method can be used for many applications where knowing the time-dispersion characteristics of a channel is required, and is, for example, particularly suitable for designing a channel estimation filter, and for link adaptation. Application to devices and apparatus implementing these methods.

Correlation method for channel estimation for OFDM

A method and a device of providing timing information within a wireless communication system is described. The timing information is extracted from a received transmit signal. The inventive method comprises the steps of providing a training signal on the receiver side relating to a known signal portion of the transmit signal, scaling the training signal, quantizing the scaled training signal, correlating one or more parts of the received transmit signal with the scaled training signal to obtain one or more correlation results, and determining the timing information on the basis of the correlation results.

Method and device for providing timing information in a wireless communication system

The invention relates to a method of multiplexing data words in a multicarrier transmit diversity system. The method comprises the step of generating a plurality of data blocks, each data block comprising data words and each data word containing data symbols derived from a data signal, the step of determining for one or more data blocks in dependence on at least one transmission constraint if the data words of said one or more data blocks are to be multiplexed in the time domain or in the frequency domain and the step of multiplexing the data words of the data blocks in accordance with the determination result.

Multiplexing method in a multi carrier transmit diversity system

Method of arranging a cellular radio network in a geographical area which is already covered by an existing cellular radio network, wherein cell clusters of the cellular radio network to be introduced and using a specific transmission frequency are located in areas determined by connecting at least two cells of the existing cellular radio network using the specific transmission frequency, and wherein the cell clusters are arranged such that they do not overlap with the cells of the existing cellular radio network. The cell clusters of the introduced cellular radio network may be adjusted by reducing the cell size of cell clusters of the introduced cellular radio network, and by introducing new cells into cell clusters of the introduced cellular radio network. The invention allows to reuse frequencies of an existing cellular radio network by an introduced cellular radio network in the same geographical area.

Cellular radio network reusing frequencies

A method and a stage for estimating channel coefficients in a multi carrier system operating in accordance with a block-code based transmit diversity scheme, in which a data content of a code matrix is multiplexed in a frequency domain are described. The method comprises determining a phase ramp in the frequency domain or an equivalent thereof in the time domain, the phase ramp or the equivalent thereof being comprised within a receive signal after timing synchronization, processing the receive signal to remove the phase ramp or the equivalent thereof and estimating the channel coefficients on the basis of the processed receive signal.

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Schwabach, Germany

Udo Wachsmann