# US 10,313,096 B2 · Method for selecting HD mode or FD mode in wireless communication system supporting FDR scheme and apparatus therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,313,096 B2 - Document ID: US10313096B2 - Status: Granted - Kind: B2 - Application number: 15/556,705 - Filed: 2015-10-14 - Published: 2018-03-01 - Granted: 2019-06-04 - Earliest claimed: 2015-03-09 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Kwangseok Noh; Hyunsoo Ko; Kukheon Choi; Dongkyu Kim; Sangrim Lee - Web page: https://patentgrep.com/patent/US10313096B2 ## CPC - H04L 5/16: Half-duplex systems; Simplex/duplex switching; Transmission of break signals {non-automatically inverting the direction of transmission} - H04B 17/18: Monitoring during normal operation - H04B 17/336: Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] - H04L 5/143: {for modulated signals (H04L5/1469 takes precedence)} - H04L 5/0023: {Time-frequency-space} - H04L 5/006: {Quality of the received signal, e.g. BER, SNR, water filling} - H04W 88/02: Terminal devices - H04W 88/08: Access point devices - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - 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 for selecting, by a base station, HD mode or FD mode in a wireless communication system supporting an FDR scheme may comprise: a step of receiving, from a second terminal which receives interference from a first terminal, a value related to the signal to noise ratio (SNR) of the second terminal and a value related to the signal-to-interference-plus-noise ratio (SINR) of the second terminal; a step of measuring the SNR value and the SINR value of the base station; a step of calculating the channel capacity ratio between the HD mode and the FD mode by using the received value related to the SNR of the second terminal, the received value related to the SINR of the second terminal, the measured SNR value of the base station, and the measured SINR value of the base station; and a step of selecting either mode on the basis of the calculated channel capacity ratio between the HD mode and the FD mode. ## Claims ### Claim 1 A method for selecting either a half duplex (HD) mode or a full duplex (FD) mode by a base station (BS) in a wireless communication system supporting a full duplex radio (FDR) scheme, the method comprising: receiving, from a second user equipment (UE) which suffers interference from a first UE, a value related to a signal-to-noise ratio (SNR) of the second UE and a value related to a signal-to-interference-plus-noise ratio (SINR) of the second UE; measuring SNR and SINR values of the BS; calculating a channel capacity ratio between the HD mode and FD mode using the value related to SNR of the second UE, the value related to SINR of the second UE, the measured SNR value of the BS, and the measured SINR value of the BS, wherein the channel capacity ratio between the HD and FD modes is obtained based on an equation including log ⁢ { ( 1 + SINR eNB ) 2 ⁢ ( 1 + SINR victim ) 2 } log ⁢ { ( 1 + SNR eNB ) ⁢ ( 1 + SNR victim ) } , wherein SNRvictim is the SNR of the second UE and SINRvictim is the SINR of the second UE; and selecting either the HD or FD mode based on the calculated channel capacity ratio, wherein when the calculated channel capacity ratio is compared with a specific threshold value and the ratio is lower than the specific threshold value, the HD mode is selected, and otherwise, the FD mode is selected. ### Claim 2 (depends on 1) The method of claim 1, further comprising transmitting information on the selected mode to the first UE and the second UE. ### Claim 3 (depends on 1) The method of claim 1, wherein the value related to SNR of the second UE includes receive power and a thermal noise value of the second UE for a specific signal in a corresponding channel bandwidth. ### Claim 4 (depends on 1) The method of claim 1, wherein the value related to SINR of the second UE includes receive power and a thermal noise value of the second UE for a specific signal in a corresponding channel bandwidth and inter-UE interference power caused by the first UE. ### Claim 5 (depends on 1) The method of claim 1, wherein the specific threshold value is 1. ### Claim 6 A base station (BS) for selecting either a half duplex (HD) mode or a full duplex (FD) mode in a wireless communication system supporting a full duplex radio (FDR) scheme, the BS comprising: a receiver configured to receive, from a second user equipment (UE) which suffers interference from a first UE, a value related to a signal-to-noise ratio (SNR) of the second UE and a value related to a signal-to-interference-plus-noise ratio (SINR) of the second UE; and a processor configured to: measure SNR and SINR values of the BS; calculate a channel capacity ratio between the HD mode and FD mode using the value related to SNR of the second UE, the value related to SINR value of the second UE, the measured SNR value of the BS, and the measured SINR value of the BS, wherein the channel capacity ratio between the HD and FD modes is obtained based on an equation including log ⁢ { ( 1 + SINR eNB ) 2 ⁢ ( 1 + SINR victim ) 2 } log ⁢ { ( 1 + SNR eNB ) ⁢ ( 1 + SNR victim ) } , wherein SNRvictim is the SNR of the second UE and SINRvictim is the SINR of the second UE; and select either the HD or FD mode based on the calculated channel capacity ratio, wherein when the calculated channel capacity ratio is compared with a specific threshold value and the ratio is lower than the specific threshold value, the HD mode is selected, and otherwise, the FD mode is selected. ### Claim 7 (depends on 6) The BS of claim 6, further comprising a transmitter configured to transmit information on the selected mode to the first UE and the second UE. ### Claim 8 (depends on 6) The BS of claim 6, wherein the value related to SNR of the second UE includes receive power and a thermal noise value of the second UE for a specific signal in a corresponding channel bandwidth. ### Claim 9 (depends on 6) The BS of claim 6, wherein the value related to SINR of the second UE includes receive power and a thermal noise value of the second UE for a specific signal in a corresponding channel bandwidth and inter-UE interference power caused by the first UE. ### Claim 10 (depends on 6) The BS of claim 6, wherein the specific threshold value is 1. ### Claim 11 A method for selecting either a half duplex (HD) mode or a full duplex (FD) mode by a first user equipment (UE) suffering interference from a neighboring UE in a wireless communication system supporting a full duplex radio (FDR) scheme, the method comprising: measuring signal-to-noise ratio (SNR) and signal-to-interference-plus-noise ratio (SINR) values of the first UE; calculating a value related to a channel capacity ratio between the HD mode and FD mode using a value related to SNR of the first UE, and a value related to SINR of the first UE, wherein the value related to the channel capacity ratio between the HD and FD modes is obtained based on an equation including (1+SINRvictim)2/(1+SNRvictim), wherein SINRvictim is the SINR of the first UE and SNRvictim is the SNR of the first UE; and selecting either the HD or FD mode based on the value related to the channel capacity ratio is compared with a specific threshold value and the ratio is lower than the specific threshold value, the HD mode is selected, and otherwise, the FD mode is selected. ### Claim 12 (depends on 11) The method of claim 11, further comprising transmitting information indicating the selected mode to a base station (BS). ### Claim 13 (depends on 11) The method of claim 11, wherein the specific threshold value is 1. ### Claim 14 A first user equipment (UE) for selecting either a half duplex (HD) mode or a full duplex (FD) mode in a wireless communication system supporting a full duplex radio (FDR) scheme, wherein the first UE suffers interference from a neighboring UE, the first UE comprising: a processor configured to: measure signal-to-noise ratio (SNR) and signal-to-interference-plus-noise ratio (SINR) values of the first UE; calculate a value related to a channel capacity ratio between the HD mode and FD mode using a value related to SNR of the first UE, and a value related to SINR of the first UE, wherein the value related to the channel capacity ratio between the HD and FD modes is obtained based on an equation including (1+SINRvictim)2/(1+SNRvictim), wherein SINRvictim is the SINR of the first UE and SNRvictim is the SNR of the first UE; and select either the HD or FD mode based on the value related to the channel capacity ratio is compared with a specific threshold value and the ratio is lower than the specific threshold value, the HD mode is selected, and otherwise, the FD mode is selected. ### Claim 15 (depends on 14) The first UE of claim 14, further comprising a transmitter configure to transmit information indicating the selected mode to a base station (BS). ### Claim 16 (depends on 14) The first UE of claim 14, wherein the specific threshold value is 1.