Alcatel Lucent

Samsung Electronics Co., Ltd.

Alcatel

Alcatel N.v.

Cornelis Hoek

Thorsten Wild

Volker Braun

Michael Tangemann

Hardy Halbauer

Michael Ohm

Federico Boccardi

Paolo Baracca

Heinz Schlesinger

Embodiments provide an apparatus, a method, a central unit and a computer program for determining information related to precoding. A mobile communication system () comprises one or more relay station transceivers () being configured, to provide wireless services to one or more mobile transceivers () of the mobile communication system () via a first radio channel. The one or more relay station transceivers () are configured to use wireless backhaul communication to communicate with a central, unit () of the mobile communication system () via a second radio channel. An apparatus () for determining information related to precoding in the mobile communication system () comprises one or more interfaces () configured to obtain, information related to the first radio channel or an. effective access channel, and to obtain information related to the second radio channel. The apparatus () further comprises a control module () configured to determine the information related to the precoding based on the information related to the first radio channel or the effective access channel, and based on the information related to the second radio channel.

Apparatus, method, central unit and computer program for determining precoding information

Embodiments provide beamforming apparatuses, methods and a computer programs for a base station transceiver and a mobile transceiver. An apparatus () operable in a base station transceiver () of a mobile communication system comprises a transceiver module () comprising interfaces to a plurality () of antennas. The transceiver module () is operable to subdivide the plurality () of antennas in a plurality of subgroups using the interfaces, and to form a first beam pattern () using one or more antennas of a subgroup. The apparatus () further comprises a control module (), which is operable to transmit a synchronization signal using the transceiver module () and the first beam pattern (). The control module () is further operable to receive a response signal after transmission of the synchronization signal from a mobile transceiver () using the transceiver module (), to determine a second beam pattern () based on the response signal from the mobile transceiver (). The second beam pattern () has a higher antenna gain than the first beam pattern (), and to transmit a signal to the mobile transceiver () using the second beam pattern () and the transceiver module (). An apparatus () operable in a mobile transceiver () of a mobile communication system comprises a transceiver module () comprising interfaces to a plurality of antennas (), and a control module () operable to determine a first set of beam patterns () based on the plurality of antennas (), to receive a signal from a base station transceiver () using a first beam pattern from the first set of beam patterns () using the transceiver module (). The control module () is further operable to determine a second set of beam patterns () based on the plurality of antennas (), the second set of beam patterns () comprising more beam patterns than the first set of beam patterns (), and to transmit a signal to the base station transceiver () using a second beam pattern from the set of second beam patterns () and using the transceiver module ().

Beamforming apparatuses, methods and computer programs for a base station transceiver and a mobile transceiver

The embodiments of the invention relate to a method and a transmitter apparatus for generating and transmitting channel feedback. The method contains the steps of determining at least one first quality value averaged over a long term time interval for a first transmission channel (TC) from a first antenna system (AS) of a radio communication system (RCS) to an antenna system (AS) of a network node (MS) containing the transmitter apparatus and at least one second quality value averaged over the long term time interval for at least one second transmission channel (TC, TC) from at least one second antenna system (AS, AS) of the radio communication system (RCS) to the antenna system (AS) of the network node (MS), determining a distribution of radio resource units of a predefined feedback radio resource based on the at least first quality value and the at least second quality value, transmitting to a receiver apparatus (BS) a long term feedback containing the at least one first quality value and the at least one second quality value, and transmitting with a short term time interval smaller than or equal to the long term time interval to the receiver apparatus (BS) a short term feedback containing first short term information for the first transmission channel (TC) and at least second short term information for the at least second transmission channel (TC, TC) using the distribution of radio resource units. The embodiments of the invention further relate to a method and a receiver apparatus for receiving and retrieving channel feedback at a receiver apparatus. The method contains the steps of receiving from a transmitter apparatus a long term feedback containing the at least one first quality value and the at least one second quality value, receiving from the transmitter apparatus with the short term time interval the short term feedback using the distribution of radio resource units, and determining the first short term information and the at least second short term information from the short term feedback based on the distribution of radio resource units.

Method and transmitter apparatus for generating and transmitting channel feedback and method and receiver apparatus for receiving and retrieving channel feedback

The present invention relates to a method for multi-antenna signal processing at an antenna element arrangement belonging to a transceiver of a radio communication network, the antenna element arrangement comprising antenna elements () in horizontal and in vertical direction, wherein complex antenna weights are applied to said antenna elements.

Method for multi-antenna signal processing at an antenna element arrangement, corresponding transceiver and corresponding antenna element arrangement

When building sets of mobile stations in a radio communication network, reference signals are transmitted from a base station to at least two mobile stations to determine channel properties of a downlink channel between the base station and the at least two mobile stations. First and second feedback information are determined at the at least two mobile stations respectively, each feedback information comprising a first component indicating a channel quality. The first and the second feedback information are transmitted from the first and second mobile stations to the base station. A mobile station set is built according to the first and the second feedback information at the base station, wherein the channel quality is a parameter of a downlink beam with a largest received carrier power of at least three downlink beams of said downlink channel.

Method for building sets of mobile stations in MIMO systems, corresponding mobile station, base station, operation and maintenance centre and radio communication network

The present invention relates to a method for determining the appropriate combination of at least two MIMO transmission techniques for a radio link in between a transmitter () and a receiver (). The MIMO transmission techniques use at least two antennas () with at least two polarizations. According to the invention the appropriate combination is the combination of beamforming and at least one of polarization time coding, closed loop coherent combination of polarization beams and polarization multiplexing. The appropriate combination is chosen dependent on at least one of radio conditions of the radio link () and relative velocity in between the transmitter () and the receiver (). The invention further relates to a method for receiving a transmission of a radio link () in between a transmitter () and a receiver (). The invention also relates to a base station comprising a transmitter, a mobile terminal comprising a receiver and a communication network.

Method for determining MIMO transmission techniques, base station and mobile terminal

The present invention relates to a method of sending first and second signals to a plurality of user equipments, the method comprising the steps of providing of a dedicated channel for each one of the plurality of user equipments, providing of a code-multiplexed shared channel for the plurality of user equipments, assigning of an antenna of a set of antennas to each one of the user equipments, sending of one of the first signals to one of the plurality of user equipments on one of the dedicated channels on a carrier frequency by applying transmit diversity, sending of one of the second signals to one of the plurality of user equipments on the code-multiplexed shared channel on the carrier frequency by applying multi-user diversity.

Telecommunication system with transmit and multi-user diversity

The determination of the direction of arrival of a radio signal by an antenna array connected to a base station of a radiocommunications system, particularly of an SDMA (Space Division Multiple Access) mobile radio system, is complicated by multipath. A method is known which uses the so-called ESPRIT algorithm and which is especially suited for a reliable estimation of direction, since the receive level (Sm) and the phase position (.phi.m) are measured for each radiating element and entered in a symmetrical matrix (A) in order to then determine the direction of arrival by eigenvalue decomposition. A simpler and faster method (100) is proposed which involves computing the eigenvector (Wn) corresponding to the dominant eigenvalue (.lambda.1) of this matrix (A), which indicates the direction of arrival (DOA) of the strongest radio signal (S) (steps 130 and 140). The computationally intensive eigenvalue decomposition is eliminated.

Method of determining the direction of arrival of a radio signal, as

To assign a carrier frequency to different mobile stations in a conventional Space Division Multiple Access (SDMA) radio system, the stations are differentiated according to the direction in space from which they transmit radio signals to a base station. In addition, the distances between the base station and the mobile stations are compared. To prevent interference at the receiving site (base station BTS), according to the invention a carrier frequency (f) is assigned to the different mobile stations (MS1 to MS3) only if the directions in space (.THETA.1 to .THETA.3) are sufficiently different and the receive levels (P1 to P3) of the radio signals are sufficiently equal. To that end, each mobile station (MS1 to MS3) is assigned a guard area, which encompasses at least a preselected solid angle (lobe width w) and at most a preselected level space (dynamic range S). Any further mobile station wanting a radio link with the base station on the same carrier frequency (f) must be located in a permissible zone (Z) between the guard areas, which comprises a level range (zP) that is common to all preceding mobile stations. A further guard area is defined with each further connection, and the permissible zone (Z) is determined anew. The full capacity of the carrier frequency (f) is only attained when the permissible zone (Z) becomes so small that it no longer comprises sufficient space for the solid angle (w).

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Tamm, Germany

Cornelis Hoek