# US 12,191,949 B2 · Method and apparatus for antenna port switching in near field LoS MIMO > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,949 B2 - Document ID: US12191949B2 - Status: Granted - Kind: B2 - Application number: 17/676,707 - Filed: 2022-02-21 - Published: 2022-11-24 - Granted: 2025-01-07 - Earliest claimed: 2021-05-19 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Sandy Saab; Shadi Abu-Surra; Gang Xu - Web page: https://patentgrep.com/patent/US12191949B2 ## CPC - H04B 7/0608: {Antenna selection according to transmission parameters} - H04B 17/27: for locating or positioning the transmitter - H04B 7/0619: {using feedback from receiving side (feedback signaling for adaptive modulation/coding H04L1/0001)} - H04B 17/336: Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] - H04B 17/382: for resource allocation, admission control or handover - H04B 7/0691: {using subgroups of transmit antennas} - H04B: TRANSMISSION ## Abstract A system and method for an efficient port switching technique for line-of-sight multiple-input multiple-output communications by a base station is provided. The base station includes an antenna array comprising a first number of antenna ports. The base station also includes a transceiver configured to communicate in a wireless communication medium. The base station further includes a processor. The processor is configured to determine, based on the wireless communication medium, one or more parameters of the base station or a receive base station. The processor also is configured to select, based on the one or more first parameters and one or more second parameters, a second number of antenna ports to perform a communication with the receive base station. ## Claims ### Claim 1 A base station comprising: an antenna array comprising a first number of antenna ports; a transceiver configured to communicate in a wireless communication medium; and a processor configured to: determine, based on the wireless communication medium, one or more parameters of the base station or a receive base station; determine, based on the one or more parameters, a first distance between at least two antenna ports of the base station and a second distance between at least two antenna ports of the receive base station; and select, based on the first distance and the second distance, a second number of antenna ports to perform a communication with the receive base station. ### Claim 2 (depends on 1) The base station of claim 1, wherein the processor is configured to: receive an input comprising base station locations in a mesh network; and determine the first distance and the second distance by: calculating a first capacity using a subset of different antenna ports of the base station and a subset of different antenna ports of the receive base station by subtracting a maximum distance between the base station and the receive base station with a minimum distance between the base station and the receive base station; and calculating a second capacity using the subset of different antenna ports of the base station and the subset of different antenna ports of the receive base station based on an average distance between the base station and the receive base station. ### Claim 3 (depends on 2) The base station of claim 2, wherein the processor is configured to: select a larger capacity between of the first capacity and the second capacity; and based on the larger capacity, configure an antenna spacing. ### Claim 4 (depends on 1) The base station of claim 1, wherein the processor is configured to receive, as an input, the one or more parameters for at least the base station and the receive base station and a signal to noise ratio (SNR). ### Claim 5 (depends on 1) The base station of claim 1, wherein the one or more parameters comprises one or more of: a base station height; base station antenna tilt angles; a frequency of operation; a SNR; one or more different distances between base stations in a mesh network; a number of antenna ports at each of the base station and the receive base station; or an antenna geometry. ### Claim 6 (depends on 1) The base station of claim 1, wherein the base station is further configured to communicate with the receive base station and another receive base station in a mesh network. ### Claim 7 (depends on 1) The base station of claim 1, wherein the one or more parameters comprise (i) a number of antenna ports at each of the base station and the receive base station, (ii) a frequency of operation, (iii) one or more different distances between base stations in a mesh network, and (iv) one or more base station antenna tilt angles. ### Claim 8 A method comprising: determining, based on a wireless communication medium, one or more parameters of a transmit base station or a receive base station; determining, based on the one or more parameters, a first distance between at least two antenna ports of the transmit base station and a second distance between at least two antenna ports of the receive base station; and selecting, based on the first distance and the second distance, a second number of antenna ports to perform a communication with the receive base station. ### Claim 9 (depends on 8) The method of claim 8, wherein determining the first distance and the second distance further comprises: receiving an input comprising base station locations in a mesh network; and determining the first distance and the second distance by: calculating a first capacity using a subset of different antenna ports of the transmit base station and a subset of different antenna ports of the receive base station by subtracting a maximum distance between the transmit base station and the receive base station with a minimum distance between the transmit base station and the receive base station; and calculating a second capacity using the subset of different antenna ports of the transmit base station and the subset of different antenna ports of the receive base station based on an average distance between the transmit base station and the receive base station. ### Claim 10 (depends on 9) The method of claim 9, further comprising: selecting a larger capacity between of the first capacity and the second capacity; and based on the larger capacity, configuring an antenna spacing. ### Claim 11 (depends on 8) The method of claim 8, further comprising: receiving, as an input, the one or more parameters for at least the transmit base station and the receive base station and a signal to noise ratio (SNR). ### Claim 12 (depends on 8) The method of claim 8, wherein the one or more parameters comprises one or more of: a base station height; base station antenna tilt angles; a frequency of operation; a SNR; one or more different distances between base stations in a mesh network; a number of antenna ports at each of the transmit base station and the receive base station; or an antenna geometry. ### Claim 13 (depends on 8) The method of claim 8, wherein the transmit base station communicates, via the wireless communication medium, with the receive base station and another receive base station in a mesh network. ### Claim 14 (depends on 8) The method of claim 8, wherein the one or more parameters comprise (i) a number of antenna ports at each of the transmit base station and the receive base station, (ii) a frequency of operation, (iii) one or more different distances between base stations in a mesh network, and (iv) one or more base station antenna tilt angles. ### Claim 15 A non-transitory computer readable medium comprising a plurality of instructions that, when executed by at least one processor, cause the at least one processor to: communicate in a wireless communication medium; determine, based on the wireless communication medium, one or more parameters of a transmit base station or a receive base station; determine, based on the one or more parameters, a first distance between at least two antenna ports of the transmit base station and a second distance between at least two antenna ports of the receive base station; and select, based on the first distance and the second distance, a second number of antenna ports to perform a communication with the receive base station. ### Claim 16 (depends on 15) The non-transitory computer readable medium of claim 15, wherein the instructions, when executed, further cause the processor to: receive an input comprising base station locations in a mesh network; and determine the first distance and the second distance by: calculating a first capacity using a subset of different antenna ports of the transmit base station and a subset of different antenna ports of the receive base station by subtracting a maximum distance between the transmit base station and the receive base station with a minimum distance between the transmit base station and the receive base station; and calculating a second capacity using the subset of different antenna ports of the transmit base station and the subset of different antenna ports of the receive base station based on an average distance between the transmit base station and the receive base station. ### Claim 17 (depends on 16) The non-transitory computer readable medium of claim 16, wherein the instructions, when executed, further cause the processor to: select a larger capacity between of the first capacity and the second capacity; and based on the larger capacity, configure an antenna spacing. ### Claim 18 (depends on 15) The non-transitory computer readable medium of claim 15, wherein the instructions, when executed, further cause the processor to: receive, as an input, the one or more parameters for at least the transmit base station and the receive base station and a signal to noise ratio (SNR). ### Claim 19 (depends on 15) The non-transitory computer readable medium of claim 15, wherein the one or more parameters comprises one or more of: a base station height; base station antenna tilt angles; a frequency of operation; a SNR; one or more different distances between base stations in a mesh network; a number of antenna ports at each of the transmit base station and the receive base station; or an antenna geometry. ### Claim 20 (depends on 15) The non-transitory computer readable medium of claim 15, wherein the one or more parameters comprise (i) a number of antenna ports at each of the transmit base station and the receive base station, (ii) a frequency of operation, (iii) one or more different distances between base stations in a mesh network, and (iv) one or more base station antenna tilt angles.