# US 2016/0262181 A1 · Apparatus and method for performing user terminal selection operation and beam forming operation in wireless communication system supporting mimo technology > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0262181 A1 - Document ID: US20160262181A1 - Status: Published application - Kind: A1 - Application number: 15/031,253 - Filed: 2014-09-24 - Published: 2016-09-08 - Earliest claimed: 2013-10-21 - Assignees: Samsung Electronics Co., Ltd.; Korea Advanced Institute of Science and Technology - Applicants: Samsung Electronics Co., Ltd.; Korea Advanced Institute of Science and Technology - Inventors: Jung-Hoon Lee; Wan Choi; Hyun-Kyu Yu - Web page: https://patentgrep.com/patent/US20160262181A1 ## CPC - H04W 74/02: Hybrid access - H04B 7/0417: Feedback systems - H04B 7/0452: Multi-user MIMO systems - H04B 7/0617: {for beam forming} - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04J 11/00: Orthogonal multiplex systems, {e.g. using WALSH codes}(H04J13/00 takes precedence) - H04L 1/16: in which the return channel carries supervisory signals, e.g. repetition request signals - H04L 27/10: Frequency-modulated carrier systems, i.e. using frequency-shift keying (H04L27/32 takes precedence) - H04B 7/0628: {Diversity capabilities} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## 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 of transmitting feedback information by a receiving apparatus in a wireless communication system supporting a multiple input multiple output (MIMO) scheme is provided. The method includes transmitting, to a transmitting apparatus, an antenna group identifier (ID) of one or more antenna groups used by the transmitting apparatus and feedback information including information related to channel quality which the receiving apparatus is capable of acquiring if the one or more antenna groups are used, wherein each of the antenna groups includes one or more antennas. ## Claims ### Claim at position 1 1-16. (canceled) ### Claim 17 A method of transmitting feedback information by a receiving apparatus in a wireless communication system supporting a multiple input multiple output (MIMO) scheme, the method comprising: transmitting, to a transmitting apparatus, an antenna group identifier (ID) of one or more antenna groups used by the transmitting apparatus and the feedback information including information related to channel quality which the receiving apparatus is capable of acquiring if the one or more antenna groups are used, wherein each of the antenna groups includes one or more antennas. ### Claim 18 (depends on 17) The method of claim 17, wherein the feedback information further includes channel direction information (CDI) corresponding to the one or more antenna groups. ### Claim 19 (depends on 17) The method of claim 17, wherein the information related to the channel quality includes information related to a channel quality which the receiving apparatus is capable of acquiring on average if the one or more antenna groups are used. ### Claim 20 (depends on 17) The method of claim 17, wherein a number of antenna groups used by the transmitting apparatus is less than a number of radio frequency (RF) chains used by the transmitting apparatus. ### Claim 21 (depends on 17) The method of claim 17, wherein a number of the antenna groups is determined based on a number of feedback information bits included in the feedback information, transmission power used by the transmitting apparatus, a number of transmission antennas included in the transmitting apparatus, and a number of receiving apparatuses to which the transmitting apparatus provides a service. ### Claim 22 (depends on 17) The method of claim 17, wherein a number of the antenna groups is determined based on an Equation of  [ ∑ s ∈ S   log 2 ( 1 + P S   h s †  v s  2 1 + ∑ i ∈ S  \  { s }   P S   h i †  v i  2 ) ] = E [ ∑ s ∈ S   log 2  ( 1 + P S   h s  2   h _ s †  v s  2 ) ] -   [ ∑ s ∈ S   log 2  ( 1 + ∑ i ∈ S  \  { s }   P S   h i  2   h _ i †  v i  2 ) ]  ≈ ( a )  S   log 2  ( 1 + P S  M S  ( M - 1 ) ) - S   log 2  ( 1 + P S    [ min k ∈ [ K }   h k c  2 ]  2 - bS ( S - 1 )  M )  ≈ ( b )  S   log 2  ( 1 + P S  M S  ( M - 1 ) ) - S   log 2  ( 1 + P S  K - S ( S - 1 )  M  2 - bS ( S - 1 )  M ) , where S denotes the number of the antenna groups, P denotes transmission power of the transmitting apparatus, M denotes a number of antennas included in the transmitting apparatus, K denotes a number of receiving apparatuses to which the transmitting apparatus provides a service, hs denotes a channel of the receiving apparatus using an sth antenna group, and vs denotes a beamforming vector applied to the sth antenna group. ### Claim 23 (depends on 17) The method of claim 17, wherein the information related to the channel quality which the receiving apparatus is capable of acquiring if the one or more antenna groups are used includes one of information indicating the channel quality which the receiving apparatus is capable of acquiring if the one or more antenna groups are used and information indicating channel quality which the receiving apparatus is capable of acquiring if remaining antenna groups except for the one or more antenna groups are used among the antenna groups. ### Claim 24 A method of receiving feedback information by a transmitting apparatus in a wireless communication system supporting a multiple input multiple output (MIMO) scheme, the method comprising: receiving, from a receiving apparatus, an antenna group identifier (ID) of one or more antenna groups used by the transmitting apparatus and the feedback information including information related to channel quality which the receiving apparatus is capable of acquiring if the one or more antenna groups are used, wherein each of the antenna groups includes one or more antennas. ### Claim 25 (depends on 24) The method of claim 24, wherein the feedback information further includes channel direction information (CDI) corresponding to the one or more antenna groups. ### Claim 26 (depends on 24) The method of claim 24, wherein the information related to the channel quality is information related to channel quality which the receiving apparatus is capable of acquiring on average if the one or more antenna groups are used. ### Claim 27 (depends on 24) The method of claim 24, wherein a number of the antenna groups used by the transmitting apparatus is less than a number of radio frequency (RF) chains used by the transmitting apparatus. ### Claim 28 (depends on 24) The method of claim 24, wherein a number of the antenna groups is determined based on of a number of feedback information bits included in the feedback information, transmission power used by the transmitting apparatus, a number of transmission antennas included in the transmitting apparatus, and a number of receiving apparatuses to which the transmitting apparatus provides a service. ### Claim 29 (depends on 24) The method of claim 24, wherein a number of the antenna groups is determined based on an Equation of  [ ∑ s ∈ S   log 2 ( 1 + P S   h s †  v s  2 1 + ∑ i ∈ S  \  { s }   P S   h i †  v i  2 ) ] = E [ ∑ s ∈ S   log 2  ( 1 + P S   h s  2   h _ s †  v s  2 ) ] -   [ ∑ s ∈ S   log 2  ( 1 + ∑ i ∈ S  \  { s }   P S   h i  2   h _ i †  v i  2 ) ]  ≈ ( a )  S   log 2  ( 1 + P S  M S  ( M - 1 ) ) - S   log 2  ( 1 + P S    [ min k ∈ [ K }   h k c  2 ]  2 - bS ( S - 1 )  M )  ≈ ( b )  S   log 2  ( 1 + P S  M S  ( M - 1 ) ) - S   log 2  ( 1 + P S  K - S ( S - 1 )  M  2 - bS ( S - 1 )  M ) , where S denotes the number of the antenna groups, P denotes transmission power of the transmitting apparatus, M denotes a number of antennas included in the transmitting apparatus, K denotes a number of receiving apparatuses to which the transmitting apparatus provides a service, hs denotes a channel of the receiving apparatus using an sth antenna group, and vs denotes a beamforming vector applied to the sth antenna group. ### Claim 30 (depends on 24) The method of claim 24, wherein the information related to the channel quality which the receiving apparatus is capable of acquiring if the one or more antenna groups are used includes one of information indicating the channel quality which the receiving apparatus is capable of acquiring if the one or more antenna groups are used and information indicating a channel quality which the receiving apparatus is capable of acquiring if remaining antenna groups except for the one or more antenna groups are used among the antenna groups. ### Claim 31 A receiving apparatus in a wireless communication system supporting a multiple input multiple output (MIMO) scheme, the receiving apparatus comprising: a transmitter configured to transmit, to a transmitting apparatus, an antenna group identifier (ID) of one or more antenna groups used by the transmitting apparatus and feedback information including information related to channel quality which the receiving apparatus is capable of acquiring if the one or more antenna groups are used, wherein each of the antenna groups includes one or more antennas. ### Claim 32 (depends on 31) The receiving apparatus of claim 31, wherein the feedback information further includes channel direction information (CDI) corresponding to the one or more antenna groups. ### Claim 33 (depends on 31) The receiving apparatus of claim 31, wherein the information related to the channel quality includes information related to a channel quality which the receiving apparatus is capable of acquiring on average if the one or more antenna groups are used. ### Claim 34 (depends on 31) The receiving apparatus of claim 31, wherein a number of antenna groups used by the transmitting apparatus is less than a number of radio frequency (RF) chains used by the transmitting apparatus. ### Claim 35 (depends on 31) The receiving apparatus of claim 31, wherein a number of the antenna groups is determined based on a number of feedback information bits included in the feedback information, transmission power used by the transmitting apparatus, a number of transmission antennas included in the transmitting apparatus, and a number of receiving apparatuses to which the transmitting apparatus provides a service. ### Claim 36 (depends on 31) The receiving apparatus of claim 31, wherein the information related to the channel quality which the receiving apparatus is capable of acquiring if the one or more antenna groups are used includes one of information indicating the channel quality which the receiving apparatus is capable of acquiring if the one or more antenna groups are used and information indicating channel quality which the receiving apparatus is capable of acquiring if remaining antenna groups except for the one or more antenna groups are used among the antenna groups.