Method and arrangement in a wireless communication system
First Claim
1. A method in a base station for sending data to a user equipment, wherein the base station includes an instance of a codebook corresponding to another instance of the codebook in the user equipment, and 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 non-codebook based precoder, based on the obtained channel state information;
selecting a precoding index from the codebook based on the calculated non-codebook based precoder;
precoding data to be transmitted to the user equipment using the calculated non-codebook based precoder; and
transmitting the precoded data, non-user dedicated reference signals and the precoding index on the estimated channel to the user equipment.
1 Assignment
0 Petitions
Accused Products
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.
7 Citations
8 Claims
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1. A method in a base station for sending data to a user equipment, wherein the base station includes an instance of a codebook corresponding to another instance of the codebook in the user equipment, and the method comprises:
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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 non-codebook based precoder, based on the obtained channel state information; selecting a precoding index from the codebook based on the calculated non-codebook based precoder; precoding data to be transmitted to the user equipment using the calculated non-codebook based precoder; and transmitting the precoded data, non-user dedicated reference signals and the precoding index on the estimated channel to the user equipment. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An arrangement in a base station configured to send data to a user equipment, wherein the base station includes an instance of a codebook that corresponds to another instance of the codebook in the user equipment, and the arrangement comprises:
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an obtaining unit configured to obtain channel state information from a signal received from the user equipment; an estimating unit configured to estimate a channel for transmitting data to the user equipment; a calculating unit configured to calculate a non-codebook based precoder, based on the obtained channel state information; a selecting unit configured to select a precoding index from the codebook based on the calculated non-codebook based precoder; a precoder configured to precode data to be transmitted to the user equipment using the calculated non-codebook based precoder; and a transmitter configured to transmit the precoded data, a non-user dedicated reference signal and the precoding index on the estimated channel to the user equipment.
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Specification