Communication system for determining data transmitting scheme according to channel state

Patent metadata

Field	Value
Publication number	US-9288688-B2
Application number	US-201213723752-A
Country	US
Kind code	B2
Filing date	Dec 21, 2012
Priority date	Dec 23, 2011
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

Disclosed is a data transmission method that may enhance a channel capacity in a wireless channel environment of a frequency band having a high directivity in which a transmission apparatus may form a transmission beam and transmit a training signal while sequentially changing a direction of the formed transmission beam, a reception apparatus may form a reception beam and receive the training signal while sequentially changing a direction of the formed reception beam, and the transmission apparatus may receive a response signal from the reception apparatus with respect to the training signal and determine a data transmission scheme based on the received response signal.

First claim

What is claimed is:

1. A method of a transmission apparatus for transmitting data to a reception apparatus using a plurality of antennas, comprising:
forming a beam into a predetermined direction using the plurality of antennas;
repeatedly transmitting a training signal to the reception apparatus while sequentially changing a direction of the formed beam, each transmission being in a different direction, and receiving at least one response signal from the reception apparatus with respect to the transmitted training signals;
determining a number of channel responses based on a magnitude and a time interval of each of the at least one response signal;
determining presence of a multipath based on the determined number of channel responses, and a magnitude and a direction of each of the at least one response signal; and
determining a data transmission scheme, which is one of
a first transmission scheme, in which a plurality of beams are formed and different pieces of the data are transmitted by each of the formed beams, and
a second transmission scheme, in which a plurality of beams are formed and a same piece of the data is transmitted by each of the formed beams,

based on the determined number of channel responses and the determined presence of a multipath, for transmitting the data to the reception apparatus.

2. The method of claim 1 , further comprising:
storing the direction of the formed beam when the response signal is received.

3. The method of claim 1 , wherein the determining a number of channel responses comprises determining the number of channel responses of which the magnitude is greater than or equal to a predetermined threshold value, and of which the time interval is greater than or equal to a predetermined time interval.

4. The method of claim 1 , further comprising:
transmitting the data to the reception apparatus using the determined data transmission scheme.

5. A method of a reception apparatus for receiving data, comprising:
forming a reception beam into a predetermined direction using a plurality of receive antennas;
receiving at least one training signal from a transmission apparatus that repeatedly transmits trainings signal to the reception apparatus while sequentially changing a direction of the formed reception beam, and transmitting at least one response signal to the transmission apparatus in response to the received at least one training signal; and
receiving, from the transmission apparatus, data that is transmitted using a data transmission scheme, which is one of
a first transmission scheme, in which a plurality of transmission beams are formed and different pieces of the data are transmitted by each of the formed transmission beams, and
a second transmission scheme, in which a plurality of transmission beams are formed and a same piece of the data is transmitted by each of the formed transmission beams,

determined based on the transmitted at least one response signal.

6. The method of claim 5 , wherein:
the transmitted at least one response signal is used to verify a number of channel responses and the presence of a multipath, and
the data transmission scheme is determined based on the number of channel responses and the presence of the multipath.

7. The method of claim 5 , wherein the receiving the data comprises receiving the transmitted data using the plurality of receive antennas and combining the received data.

8. A method of transmitting data, comprising:
forming a first transmission beam into a predetermined direction using a plurality of transmit antennas;
repeatedly transmitting a training signal to a reception apparatus while sequentially changing a direction of the formed first transmission beam, each transmission being in a different direction;
receiving at least one response signal from the reception apparatus with respect to the training signals;
determining a number of channel responses using the at least one response signal;
determining presence of a multipath using the at least one response signal; and
determining a data transmission scheme, which is one of
a first transmission scheme, in which a plurality of beams are formed and different pieces of the data are transmitted by each of the formed beams, and
a second transmission scheme, in which a plurality of beams are formed and a same piece of the data is transmitted by each of the formed beams,

based on the determined number of channel responses and the determined presence of a multipath;
forming a second transmission beam based on the determined data transmission scheme; and
transmitting data to the reception apparatus using the second transmission beam.

9. The method of claim 8 , wherein the transmitted data is received by the reception apparatus using each of a plurality of reception beams.

Assignees

• Korea Electronics Telecomm

Inventors

• Kim Kyeong Pyo
• Hong Seung Eun
• Kim Jin Kyung

Classifications

• H04B7/0617

  for beam forming · CPC title

• H04B7/0689

  using different transmission schemes, at least one of them being a diversity transmission scheme · CPC title

• H04B7/0417

  Feedback systems · CPC title

• H04B7/0408

  using two or more beams, i.e. beam diversity · CPC title

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title