公开(公告)号：AT446620T

公开(公告)日：2009-11-15

申请号：AT07728304

申请日：2007-04-19

Applicant: ERICSSON TELEFON AB L M

Inventor： NILSSON JOHAN

IPC: H04B7/005 ,  H04W52/12

Abstract: The excess signal-to-interference ratio (SIR) or the like of a communication channel is determined by repeatedly decoding received information with successively reduced effective SIR. The step size in an outer power control algorithm, for example a Jump Algorithm, such as that commonly used for transmit power control in communication systems can then be adaptively adjusted based on the excess SIR, enabling faster convergence. Decoder hardware already present in a user equipment, such as a mobile telephone or other receiver, can advantageously be used.

公开(公告)号：DE602004020245D1

公开(公告)日：2009-05-07

申请号：DE602004020245

申请日：2004-12-20

Applicant: ERICSSON TELEFON AB L M

Inventor： NILSSON JOHAN ,  LINDOFF BENGT

IPC: H04B7/005 ,  H04W52/32

Abstract: Methods and devices in a wireless communication system are provided, where a first transceiver uses first and second receiver processing algorithms to process first and second portions of a received signal, and a second transceiver adjusts at least one of a plurality of transmission parameters for at least one of said first and second portions of a signal to be transmitted to the first transceiver. The adjustment is made in response to at least one indication, wherein the contents of the at least one indication are based, at least in part, on the fact that the first transceiver uses the first and second receiver processing algorithms to process the first and second portions of the signal. The at least one indication could be transmitted from the first transceiver, or it could be determined through evaluations carried out at the second transceiver.

公开(公告)号：AT416582T

公开(公告)日：2008-12-15

申请号：AT02792904

申请日：2002-12-05

Applicant: ERICSSON TELEFON AB L M

Inventor： HILTUNEN KIMMO ,  LINDOFF BENGT ,  NILSSON JOHAN ,  PALENIUS TORGNY ,  AKERBERG DAG

IPC: H04W16/00 ,  H04W16/02 ,  H04W36/08

Abstract: The invention solves the aforementioned problems by providing a method and apparatus capable of providing handover between carriers with different duplex frequency separation distances. This is achieved by providing a mobile terminal capable of working with unpaired uplink and downlink carrier pairs when necessary. This makes it possible to significantly increase the spectrum utilization (capacity) in a cellular system using asymmetric up-link and down-link pairs.

公开(公告)号：AT393984T

公开(公告)日：2008-05-15

申请号：AT03797286

申请日：2003-09-09

Applicant: ERICSSON TELEFON AB L M

Inventor： REIAL ANDRES ,  ERICSSON ANDERS ,  OESTBERG CHRISTER ,  SVENSSON ROBERT ,  NILSSON JOHAN ,  ERIKSSON HAKAN

Abstract: Method and system are disclosed for providing advanced RAKE delay control in wireless communications systems. The RAKE delay control method and system of the invention is capable of tracking presently known paths over time and merging the tracking results with new path searcher results. The invention is particularly suitable for devices where the resources (e.g., computational load, power) available for detecting the multipath components are limited. The result is a resource efficient architecture for positioning the RAKE fingers to best extract the signal power available in the channel and to utilize the inherent diversity due to the multipath nature of the signal.

公开(公告)号：DE60034043D1

公开(公告)日：2007-05-03

申请号：DE60034043

申请日：2000-07-12

Applicant: ERICSSON TELEFON AB L M

Inventor： NILSSON JOHAN

IPC: H04B7/06 ,  H04L1/06 ,  H04B7/26 ,  H04L25/02

Abstract: A method and apparatus are described for estimating channels in a radio communication system using transmit diversity. Channel coefficients g11,g12,g21,g22 associated with a transmit diversity channel may be estimated in a radio communication system having a Base Station (BS) and at least one Mobile Station (MS) includes a transmit diversity channel transmitted over at least two propagation paths from at least two antennas associated with a BS. A sequence of pilot symbols is provided for each of at least two antennas for transmission from the BS to a MS over the transmit diversity channel. A series of symbols r1, r2, r3, r4 are received at the MS from the transmit diversity channel and a matrix P of values of the sequence of pilot symbols is established according to a relation which satisfies a full rank condition for the matrix P which may be stored together with P in a memory. Channels estimates are determined using the matrix and the received sequence.

公开(公告)号：AT357782T

公开(公告)日：2007-04-15

申请号：AT00954488

申请日：2000-07-12

Applicant: ERICSSON TELEFON AB L M

Inventor： NILSSON JOHAN

IPC: H04B7/06 ,  H04B7/26 ,  H04L1/06 ,  H04L25/02

Abstract: A method and apparatus are described for estimating channels in a radio communication system using transmit diversity. Channel coefficients g11,g12,g21,g22 associated with a transmit diversity channel may be estimated in a radio communication system having a Base Station (BS) and at least one Mobile Station (MS) includes a transmit diversity channel transmitted over at least two propagation paths from at least two antennas associated with a BS. A sequence of pilot symbols is provided for each of at least two antennas for transmission from the BS to a MS over the transmit diversity channel. A series of symbols r1, r2, r3, r4 are received at the MS from the transmit diversity channel and a matrix P of values of the sequence of pilot symbols is established according to a relation which satisfies a full rank condition for the matrix P which may be stored together with P in a memory. Channels estimates are determined using the matrix and the received sequence.

公开(公告)号：AT336117T

公开(公告)日：2006-09-15

申请号：AT00610133

申请日：2000-12-20

Applicant: ERICSSON TELEFON AB L M

Inventor： NILSSON JOHAN ,  OESTBERG CHRISTER ,  ERIKSSON HAKAN

IPC: H04B17/345 ,  H04L1/20 ,  H04B17/00

公开(公告)号：DE60110635D1

公开(公告)日：2005-06-09

申请号：DE60110635

申请日：2001-12-20

Applicant: ERICSSON TELEFON AB L M

Inventor： NILSSON JOHAN

IPC: H04B7/005 ,  H04B7/26 ,  H04B17/00

Abstract: A method is provided for estimating the SIR of signals transmitted between a mobile unit and a base station, wherein the signals comprise pilot and data symbol blocks transmitted during each of a succession of time slots. Initially, the signals of a group of slots are directed to the receiver, which may be either the mobile unit receiver or the base station receiver. SIR estimates and corresponding power changes are computed for each slot in the initial group, employing only respective pilot symbols thereof. The SIR estimates derived from the initial slot group are used to compute the delay time of power control commands sent from the receiver to the transmitter, in order to adjust the power level thereof. The SIR for signals of a specified slot, which follows the initial slot group, is then estimated from the time delay, from the pilot block of the specified slot, and from the data block of the slot immediately preceding the specified slot, collectively.

公开(公告)号：AT295026T

公开(公告)日：2005-05-15

申请号：AT01986917

申请日：2001-12-20

Applicant: ERICSSON TELEFON AB L M

Inventor： NILSSON JOHAN

IPC: H04B7/005 ,  H04B7/26 ,  H04B17/00

Abstract: A method is provided for estimating the SIR of signals transmitted between a mobile unit and a base station, wherein the signals comprise pilot and data symbol blocks transmitted during each of a succession of time slots. Initially, the signals of a group of slots are directed to the receiver, which may be either the mobile unit receiver or the base station receiver. SIR estimates and corresponding power changes are computed for each slot in the initial group, employing only respective pilot symbols thereof. The SIR estimates derived from the initial slot group are used to compute the delay time of power control commands sent from the receiver to the transmitter, in order to adjust the power level thereof. The SIR for signals of a specified slot, which follows the initial slot group, is then estimated from the time delay, from the pilot block of the specified slot, and from the data block of the slot immediately preceding the specified slot, collectively.

公开(公告)号：AU2003233956A1

公开(公告)日：2003-10-20

申请号：AU2003233956

申请日：2003-04-07

Applicant: ERICSSON TELEFON AB L M

Inventor： BERNHARDSSON BO ,  LINDOFF BENGT ,  NILSSON JOHAN

IPC: H04Q7/32 ,  H04Q7/34 ,  H04Q7/38 ,  H04B1/707 ,  H04B7/26

Abstract: A method and apparatus for improved cell detection in a cellular communication system correlates a received signal with both a primary synchronization signal and a secondary synchronization signal. The results from the primary and secondary synchronization detection are used to determine if a new cell has been found. By also including the secondary synchronization signal during the cell detection procedure, the rate of false detection can be reduced while still maintaining detection performance. In addition, a longer standby time can be achieved for the user terminal.