# US 10,122,425 B2 · Apparatus and method for transmitting and receiving transmission beam information and channel quality information in communication system supporting multi-user multi-input multi-output scheme > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,122,425 B2 - Document ID: US10122425B2 - Status: Granted - Kind: B2 - Application number: 15/176,772 - Filed: 2016-06-08 - Published: 2016-12-08 - Granted: 2018-11-06 - Earliest claimed: 2015-06-08 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Sang-Wook Suh - Web page: https://patentgrep.com/patent/US10122425B2 ## CPC - H04B 7/043: {using best eigenmode, e.g. beam forming or beam steering} - H04B 7/0452: Multi-user MIMO systems - H04B 7/063: {Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection} - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04B 7/0665: {Feed forward of transmit weights to the receiver} - H04B 7/06952: {Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping} - H04B 7/088: {using beam selection} - H04B 17/336: Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] - H04B: TRANSMISSION ## Abstract The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as a long term evolution (LTE). A method for receiving transmission beam (Tx beam) information by a user equipment (UE) in a communication system supporting a multi-user multi-input multi-output (MU-MIMO) scheme is provided. The method includes transmitting information on a selected Tx beam to a base station (BS), and receiving Tx beam information including information for a Tx beam selected by at least one UE other than the UE from the BS. ## Claims ### Claim 1 A method for receiving transmission beam (Tx beam) information by a first user equipment (UE) in a communication system supporting a multi-user multi-input multi-output (MU-MIMO) scheme, the method comprising: transmitting, to a base station (BS), first information on a first Tx beam selected by the first UE; receiving, from the BS, second information on a second Tx beam selected by at least one second UE; and transmitting, to the BS, channel quality information, wherein the channel quality information is determined based on a signal to interference and noise ratio (SINR) by using a strength of the second Tx beam as a strength of the interference. ### Claim 2 (depends on 1) The method of claim 1, further comprising: receiving a signal from the BS; and selecting the first Tx beam by performing a beam sweeping process on the signal. ### Claim 3 (depends on 1) The method of claim 1, wherein transmitting the first information on the first Tx beam comprises: transmitting the first information on the first Tx beam at a timing point, wherein the timing point is identical to a timing point at which the channel quality information is transmitted to the BS, or is different from a timing point at which the channel quality information is transmitted to the BS. ### Claim 4 (depends on 1) The method of claim 1, wherein transmitting the first information on the first Tx beam comprises: including the first information on the first Tx beam through to a message, wherein the message is identical to a message through which the channel quality information is transmitted or is different from a message through which the channel quality information is transmitted, and transmitting, to the BS, the message. ### Claim 5 (depends on 1) The method of claim 1, wherein transmitting the first information on the first Tx beam comprises: transmitting the first information on the first Tx beam by a period during which channel status is static. ### Claim 6 A method for transmitting transmission beam (Tx beam) information by a base station (BS) in a communication system supporting a multi-user multi-input multi-output (MU-MIMO) scheme, the method comprising: receiving, from a first user equipment (UE), first information on a first Tx beam selected by the first UE; transmitting, to at least one second UE, the first information on the first Tx beam selected by the first UE; and receiving, from the at least one second UE, channel quality information, wherein the channel quality information is determined based on a signal to interference and noise ratio (SINR) by using a strength of the first Tx beam as a strength of the interference. ### Claim 7 (depends on 6) The method of claim 6, wherein receiving the first information on the first Tx beam comprises: receiving the first information on the first Tx beam at a timing point, wherein the timing point is identical to a timing point at which channel quality information of the first UE is received from the first UE, or is different from a timing point at which the channel quality information of the first UE is received from the first UE. ### Claim 8 (depends on 6) The method of claim 6, wherein receiving the first information on the first Tx beam comprises: receiving the first information on the first Tx beam through a message, wherein the message is identical to a message through which channel quality information of the first UE is received, or is different from a message through which the channel quality information of the first UE is received. ### Claim 9 A first user equipment (UE) for receiving transmission beam (Tx beam) information in a communication system supporting a multi-user multi-input multi-output (MU-MIMO) scheme, the first UE comprising: a transmitter; a receiver; and a processor configured to: transmit, to a base station (BS), first information on a first Tx beam selected by the UE; receive, from the BS, second information on a second Tx beam selected by at least one second UE; and transmit, to the BS, the channel quality information, wherein the channel quality information is determined based on a signal to interference and noise ratio (SINR) by using a strength of the second Tx beam as a strength of the interference. ### Claim 10 (depends on 9) The first UE of claim 9, wherein the processor is further configured to: receive a signal from the BS, and select the first Tx beam by performing a beam sweeping process on the signal. ### Claim 11 (depends on 9) The first UE of claim 9, wherein the processor is further configured to: transmit the first information on the first Tx beam at a timing point, wherein the timing point is identical to a timing point at which the channel quality information is transmitted to the BS, or is different from a timing point at which the channel quality information is transmitted to the BS. ### Claim 12 (depends on 9) The first UE of claim 9, wherein the processor is further configured to: include the first information on the first Tx beam to a message, wherein the message is identical to a message through which the channel quality information is transmitted or is different from a message through which the channel quality information is transmitted, and transmit, to the BS, the message. ### Claim 13 (depends on 9) The first UE of claim 9, wherein the processor is further configured to transmit the first information on the first Tx beam by a period during which channel status is static. ### Claim 14 A base station (BS) for transmitting transmission beam (Tx beam) information in a communication system supporting a multi-user multi-input multi-output (MU-MIMO) scheme, the BS comprising: a transmitter; a receiver; and a processor configured to: receive, from a first user equipment (UE), first information on a first Tx beam selected by the first UE; transmit, to at least one second UE, the first information on the first Tx beam selected by the first UE; and receive, from the at least one second UE, channel quality information, wherein the channel quality information is determined based on a signal to interference and noise ratio (SINK) by using a strength of the first Tx beam as a strength of the interference.