公开(公告)号：SG181888A1

公开(公告)日：2012-07-30

申请号：SG2012046520

申请日：2010-05-12

Applicant: ERICSSON TELEFON AB L M

Inventor： BEHRAVAN ALI ,  ASTELY DAVID ,  JOENGREN GEORGE

Abstract: The present invention uses user-specific resources, as allocated on the uplink, for conveying one or more antenna-specific sounding reference signals (SRSs). This technique advantageously permits, for example, a user equipment (UE) configured for uplink Multiple- Input-Multiple-Output (MIMO) operation to send antenna-specific SRSs within the granted resources allocated to the UE via one or more scheduled uplink grants. That is, within the granted resources allocated by a given uplink grant, a UE uses at least a portion of those resources for sending antenna-specific SRSs, rather than for sending uplink data (user traffic). Thus, in one or more embodiments, the present invention comprises a method at a UE of transmitting antenna-specific SRSs for two or more uplink transmit antennas. The method comprises transmitting an antenna-specific sounding reference signal for at least one of the uplink transmit antennas within a granted resource allocated to the user equipment for a scheduled uplink data transmission.

公开(公告)号：SG181538A1

公开(公告)日：2012-07-30

申请号：SG2012041570

申请日：2010-01-12

Applicant: ERICSSON TELEFON AB L M

Inventor： HU YANG ,  ASTELY DAVID ,  SONG XINGHUA ,  WANG JIANFENG

Abstract: The prevent invention provides a method for performing channel estimation and detection in a Multiple-Input-Multiple-Output (MIMO) system, including: generating a demodulation reference signal, DM-RS, pattern for an extended cyclic prefix (CP); and estimating and detecting channel performance based on the generated DM-RS signal pattern. The DM-RS pattern supports from rank 1 to rank 8 patterns for 8 layer transmission. A transmitter, a receiver and a system thereof are also provided. The solution of the present invention improves channel estimation accuracy, saves channel estimation implementation and implementation complexity at terminals.

公开(公告)号：MX2012007390A

公开(公告)日：2012-07-23

申请号：MX2012007390

申请日：2010-01-20

Applicant: ERICSSON TELEFON AB L M

Inventor： ASTELY DAVID ,  JOENGREN GEORGE ,  HAMMARWALL DAVID ,  HU YANG ,  SONG XIANGHUA ,  WANG JIANFENG

IPC: H04B7/06

Abstract: Un método de mapeo de puerto de antena y dispositivo para desmodular señales de referencia. El método incluye: determinar un rango de transmisión para una transmisión de enlace descendente a una terminal de usuario; determinar uno o más puertos de antena de señal de referencia para la transmisión de enlace descendente basada en el rango de transmisión, en donde cada puerto se define por un par de grupo/código que comprende un grupo de multiplexión de división de código y código de cubierta ortogonal; mapear los puertos de antena de señal de referencia al pares de grupo/ códigos para cada rango de transmisión de manera que el grupo de multiplexión de división de código y código de cubierta ortogonal de código son iguales para un puerto de antena dado para cada rango de transmisión; y transmitir los símbolos de referencia de enlace descendente sobre los puertos de antena de señal de referencia que corresponden al rango de transmisión.

公开(公告)号：PL2225908T3

公开(公告)日：2012-04-30

申请号：PL08794166

申请日：2008-08-21

Applicant: ERICSSON TELEFON AB L M

Inventor： BALDEMAIR ROBERT ,  ASTELY DAVID

IPC: H04W74/08

公开(公告)号：NZ584934A

公开(公告)日：2012-03-30

申请号：NZ58493408

申请日：2008-07-02

Applicant: ERICSSON TELEFON AB L M

Inventor： BALDEMAIR ROBERT ,  ASTELY DAVID ,  ABRAHAMSSON RICHARD

IPC: H04L7/04 ,  H04W74/08

Abstract: A method in a base station for transmitting data on a radio channel and the base station (NodeB) are disclosed. The base station comprises a control unit arranged to determine a first preamble format to be used in a cell of the base station and to determine a basic cyclic shift value from a set of basic cyclic shift values. The set to use is indicated by the first preamble format and the base station further comprises a transmitting arrangement adapted to transmit data comprising indication of the determined first preamble format and a basic cyclic shift value pointer indicating the basic cyclic shift value in the set of basic cyclic shift values. Further disclosed is a method in an user equipment (UE) for processing a signal and the user equipment. The user equipment comprises a receiving arrangement adapted to receive data comprising a basic cyclic shift value pointer indicating a basic cyclic shift value and an indication of a first preamble format from base station on a radio channel, and a control unit arranged to determine a preamble format to be used in a random access procedure from the indication in the received data and to select a basic cyclic shift value in a set of basic cyclic shift values based on the basic cyclic shift value pointer. The set to use is indicated by the preamble format.

公开(公告)号：PT2225908E

公开(公告)日：2012-03-05

申请号：PT08794166

申请日：2008-08-21

Applicant: ERICSSON TELEFON AB L M

Inventor： BALDEMAIR ROBERT ,  ASTELY DAVID

IPC: H04W74/08

公开(公告)号：SG176611A1

公开(公告)日：2012-01-30

申请号：SG2011088093

申请日：2010-06-16

Applicant: ERICSSON TELEFON AB L M

Inventor： BALDEMAIR ROBERT ,  ASTELY DAVID ,  DAHLMAN ERIK ,  JADING YLVA

Abstract: The present invention relates to methods and arrangements in a base station and a user equipment for determining an uplink transmission timing correction for communication in a telecommunication system in which aggregation of component carriers is applied. The base station receives a signal from the user equipment on a uplink (UL) component carrier and measures the arrival time of the signal. A timing correction of the UL transmission timing based on the arrival time of the signal is determined. Thereupon the base station determines for which of the uplink component carriers used by the user equipment the timing correction is valid. The timing correction and the validity information is sent to the user equipment. The user equipment adjusts the UL transmission timing for each UL component carrier the timing correction is valid for.

公开(公告)号：HK1151143A1

公开(公告)日：2012-01-20

申请号：HK11105013

申请日：2011-05-20

Applicant: ERICSSON TELEFON AB L M

Inventor： BALDEMAIR ROBERT ,  ASTELY DAVID ,  ABRAHAMSSON RICHARD

IPC: H04L20060101

Abstract: The invention relates to methods and communication devices for transmitting data on a radio channel comprising the steps of determining (32) a first preamble format to be used in a cell of the second communication device, determining (34) a basic cyclic shift value from a set of basic cyclic shift values, the set is selected based on the preamble format, and transmitting (36) data comprising indication of the determined first preamble format and a basic cyclic shift value pointer indicating the basic cyclic shift value in the set of basic cyclic shift values.

公开(公告)号：AT537625T

公开(公告)日：2011-12-15

申请号：AT09707705

申请日：2009-02-05

Applicant: ERICSSON TELEFON AB L M

Inventor： ASTELY DAVID ,  PARKVALL STEFAN ,  BALDEMAIR ROBERT

IPC: H04L1/16 ,  H04L1/18 ,  H04W72/04 ,  H04W72/12

Abstract: The invention relates to a method in a first communication device of receiving control information over a radio channel from a second communication device. The first communication device receives a subframe over the radio channel, and determines whether the subframe is a downlink subframe with downlink assignment intended for the first communication device by reading data in the subframe. That being the case, the first communication device decodes data within the subframe, and determines whether any data packet being sent from the second communication device before the subframe has been missed by analyzing an indicator associated to the subframe in the data. The indicator provides knowledge about previous downlink subframes with downlink assignment intended for the first communication device.

公开(公告)号：ES2365191T3

公开(公告)日：2011-09-26

申请号：ES08779404

申请日：2008-07-02

Applicant: ERICSSON TELEFON AB L M

Inventor： BALDEMAIR ROBERT ,  ASTELY DAVID ,  ABRAHAMSSON RICHARD

IPC: H04L7/04

Abstract: Un método en una estación base (20) para la transmisión de datos en un canal de radio que comprende los pasos de: - determinar (32) un primer formato de preámbulo a ser usado en una celda de la estación base, el método se caracteriza por - determinar (34) un valor de desplazamiento cíclico básico a partir de un conjunto de valores de desplazamiento cíclico básico, el conjunto a usar se indica por el formato de preámbulo, y - transmitir (36) los datos que comprenden la indicación del primer formato de preámbulo determinado y un puntero del valor de desplazamiento cíclico básico que indica el valor de desplazamiento cíclico básico en el conjunto de valores de desplazamiento cíclico básico.