# US 9,520,925 B2 · Method and apparatus for transmitting signal in wireless communication system

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- Number: US 9,520,925 B2
- Document ID: US9520925B2
- Status: Granted
- Kind: B2
- Application number: 14/676,700
- Filed: 2015-04-01
- Published: 2015-07-23
- Granted: 2016-12-13
- Earliest claimed: 2009-03-30
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Moon Il Lee; Wook Bong Lee; Ja Ho Koo; Hyun Soo Ko; Jae Hoon Chung; Bin Chul Ihm
- Web page: https://patentgrep.com/patent/US9520925B2

## CPC

- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04L 1/0041: {Arrangements at the transmitter end}
- H04L 1/0075: {Transmission of coding parameters to receiver (H04L1/0023 takes precedence)}
- H04L 1/06: using space diversity
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 25/03343: {Arrangements at the transmitter end}
- H04W 88/02: Terminal devices
- H04W 88/08: Access point devices
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method and apparatus for transmitting a signal in a wireless communication system are provided. The method includes: generating R spatial stream each of which is generated on the basis of an information stream and reference signal; generating N transmit streams on the basis of the R spatial streams and a precoding matrix (where R<N); mapping the N transmit streams to at least one resource block; and generating N signals from the N transmit streams mapped to the at least one resource block, and the transmitting the N signals to a user equipment through respective antennas.

## Claims

### Claim 1

A method for receiving a signal in a wireless communication system, the method performed by a user equipment (UE) and comprising:
obtaining a precoding bandwidth by using radio resource control (RRC) layer signaling, wherein the precoding bandwidth indicates two or more consecutive resource blocks,
wherein the UE expects that a common precoding matrix is used in each of the two or more consecutive resource blocks indicated by the precoding bandwidth, and
wherein a size of the two or more consecutive resource blocks indicated by the precoding bandwidth depends on a system bandwidth allocated by the wireless communication system;
receiving, from a base station, a pre-coded signal via the two or more consecutive resource blocks; and
decoding the received pre-coded signal based on the common precoding matrix.

### Claim 2 (depends on 1)

The method of claim 1, wherein the size of the two or more consecutive resource blocks indicated by the precoding bandwidth is set to a size of a feedback subband that is used for feedback of channel state information (CSI),
the CSI including at least a channel quality indicator (CQI) or a rank indicator (RI).

### Claim 3 (depends on 2)

The method of claim 2, wherein the precoding bandwidth is further based on a transmission scheme configured for the UE.

### Claim 4

A user equipment (UE) for signal reception in a wireless communication system, the UE comprising:
a radio frequency unit; and
a processor coupled to the radio frequency unit and configured to:
obtain a precoding bandwidth by using radio resource control (RRC) layer signaling,
wherein the precoding bandwidth indicates two or more consecutive resource blocks wherein the UE expects that a common precoding matrix is used in the two or more consecutive resource blocks indicated by the precoding bandwidth, and
wherein a size of the two or more consecutive resource blocks indicated by the precoding bandwidth depends on a system bandwidth allocated by the wireless communication system;
instruct the radio frequency unit to receive, from a base station, a pre-coded signal via the one or more consecutive resource blocks; and
decode the received pre-coded signal based on the common precoding matrix.

### Claim 5 (depends on 4)

The UE of claim 4, wherein the size of the two or more consecutive resource blocks indicated by the precoding bandwidth is set to a size of a feedback subband that is used for feedback of channel state information (CSI), the CSI including at least a channel quality indicator (CQI) or a rank indicator (RI).

### Claim 6 (depends on 4)

The UE of claim 4, wherein the precoding bandwidth is further based on a transmission scheme configured for the UE.