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Method and device in wireless communication system

A technology of equipment and signals, applied in radio transmission systems, diversity/multi-antenna systems, transmission systems, etc., can solve problems such as inability to be used, and achieve the effects of increasing system capacity, saving resources, and improving channel estimation performance

Active Publication Date: 2016-06-29
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, previous designs of precoding using cell-specific reference signals for WCDMA were designed for a single common reference signal and thus cannot be used when there are multiple cell-specific reference signals

Method used

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  • Method and device in wireless communication system
  • Method and device in wireless communication system
  • Method and device in wireless communication system

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Embodiment Construction

[0030] The present invention is defined as a method and an arrangement in a base station, and a method and an arrangement in a user equipment, which can be implemented in the following embodiments. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will convey the scope of the invention to those skilled in the art. Technical staff.

[0031] Still other objects, advantages and features of the present invention will become apparent from the following detailed description considered in conjunction with the accompanying drawings. It should be understood, however, that the drawings are designed for purposes of illustration only, and not as a definition of the limits of the invention, for which reference is made to the appended claims. It is also to be understood that the figures are not necessari...

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Abstract

Method and arrangement in a base station for sending data to a user equipment. The base station comprises an instance of a codebook, corresponding to another instance of the codebook comprised in the user equipment. The method comprises obtaining channel state information from a signal received from the user equipment, estimating a channel to be used for transmitting data to the user equipment, calculating a precoder, based on the obtained channel state information. Further is comprised the steps of selecting a precoding index from the codebook based on the calculated precoder, or selecting a precoding index received from the user equipment, precoding data to be transmitted to the user equipment using the calculated precoder and transmitting the precoded data, a non-user dedicated reference signal and the precoding index on the estimated channel to the user equipment. Further, corresponding method and arrangement in a user equipment are described.

Description

technical field [0001] The present invention relates to a method and an arrangement in a base station and a method and an arrangement in a user equipment. Specifically, it concerns mechanisms for precoding data. Background technique [0002] Multi-antenna technology can greatly increase the data rate and reliability of wireless communication systems. Performance is improved especially when both the transmitter and receiver are equipped with multiple antennas, which creates a multiple-input multiple-output (MIMO) communication channel, and such systems and / or related technologies are commonly referred to as MIMO systems. [0003] The 3rd Generation Partnership Project (3GPP) development within the Long Term Evolution (LTE) project supports advanced multi-antenna, ie MIMO, schemes by means of channel quality measurements for link adaptation and scheduling. Precoding is a promising technique to improve throughput performance in multi-antenna schemes. In LTE, there are two ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/04H04B7/06
CPCH04B7/0417H04B7/0465H04B7/0617H04B7/0626H04B7/0639H04B7/0665
Inventor M.I.拉曼孙凡D.阿斯特利
Owner TELEFON AB LM ERICSSON (PUBL)