# US 2018/0006706 A1 · System and Method for Hybrid Beamforming Diversity > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0006706 A1 - Document ID: US20180006706A1 - Status: Published application - Kind: A1 - Application number: 15/199,301 - Filed: 2016-06-30 - Published: 2018-01-04 - Earliest claimed: 2016-06-30 - Assignees: Futurewei Technologies, Inc. - Applicants: Futurewei Technologies, Inc. - Inventors: Qian Cheng; Weimin Xiao; Jialing Liu - Web page: https://patentgrep.com/patent/US20180006706A1 ## CPC - H04B 7/0868: {Hybrid systems, i.e. switching and combining} - H04B 7/0617: {for beam forming} - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04B 7/06956: {using a selection of antenna panels} - H04B 7/0696: {Determining beam pairs} - H04B 7/088: {using beam selection} - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - 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 system and method for hybrid beamforming diversity includes a method by a UE with one or more receive antenna ports, each of the receive antenna ports associated with a plurality of receive beam ports, the method comprising receiving, by the UE, information from a network indicating configurations of one or more transmit antenna ports, each of the transmit antenna ports associated with a plurality of transmit beam ports, the information further indicating a plurality of reference signals, receiving, by the UE, a subset of the reference signals, measuring, by the UE, receive signal quality for each of the subset of the reference signals, determining, by the UE, a selected receive beam port for each of the receive antenna ports, deriving, by the UE, one or more reporting sets, transmitting, by the UE, the one or more reporting sets to the network, and receiving, by the UE, a data transmission. ## Claims ### Claim 1 A method by a UE with one or more receive antenna ports, each of the receive antenna ports associated with a plurality of receive beam ports, the method comprising: receiving, by the UE, information from a network indicating configurations of one or more transmit antenna ports, each of the transmit antenna ports associated with a plurality of transmit beam ports, the information further indicating a plurality of reference signals, each of the reference signals associated with one of the transmit beam ports for the transmit antenna ports; receiving, by the UE, a subset of the reference signals; measuring, by the UE, receive signal quality for each of the subset of the reference signals; determining, by the UE, a selected receive beam port for each of the receive antenna ports according to the receive signal quality measured; deriving, by the UE, one or more reporting sets, the one or more reporting sets corresponding to one of the receive antenna ports, each of the reporting sets indicating one or more selected transmit beam ports for the receive antenna port, the one or more reporting sets derived according to the receive signal quality measured; transmitting, by the UE, the one or more reporting sets to the network; and receiving, by the UE, a data transmission from the selected transmit beam ports using the selected receive beam port for each of the receive antenna ports. ### Claim 2 (depends on 1) The method of claim 1, wherein each of the reference signals are scanning reference signals jointly covering a range of spatial directions. ### Claim 3 (depends on 1) The method of claim 1, wherein the one or more transmit antenna ports are located in one or more transmit-receive points (TRPs). ### Claim 4 (depends on 1) The method of claim 1, wherein the information indicating the plurality of reference signals is a CSI reporting configuration, and wherein transmitting the one or more reporting sets comprises transmitting a CSI report including the one or more reporting sets. ### Claim 5 (depends on 1) The method of claim 1, wherein the one or more reporting sets indicate each of the selected transmit beam ports according to an index for the selected transmit beam port and an index for the transmit antenna port associated with the selected transmit beam port. ### Claim 6 (depends on 1) The method of claim 1, wherein receiving the data transmission comprises jointly receiving a transmission from the network with the selected receive beam port for each of the receive antenna ports. ### Claim 7 (depends on 1) The method of claim 1, wherein receiving the data transmission comprises: receiving and detecting demodulation reference signals in accordance with the selected transmit beam ports and the selected receive beam ports; and receiving the data transmission according to the demodulation reference signals. ### Claim 8 (depends on 7) The method of claim 7, wherein receiving the data transmission according to the demodulation reference signals comprises: deriving channel estimation for the demodulation reference signals; and demodulating and decoding the data transmission. ### Claim 9 (depends on 8) The method of claim 8, wherein demodulating and decoding the data transmission comprises demodulating Alamouti coded data tone pairs received in the data transmission with the selected receive beam ports. ### Claim 10 A method by a network with one or more transmit antenna ports, each of the transmit antenna ports associated with a plurality of transmit beam ports, the method comprising: sending, by the network, information to a UE indicating configurations of the transmit antenna ports, the information further indicating a plurality of reference signals, each of the reference signals associated with one of the transmit beam ports for the transmit antenna ports; transmitting, by the network, the plurality of reference signals; receiving, by the network, one or more reporting sets from the UE, each of the one or more reporting sets indicating one or more of the transmit beam ports; selecting, by the network, one or more selected transmit beam ports for each one of the reporting sets, each of the selected transmit beam ports having different transmit antenna ports; and transmitting, by the network, data using the selected transmit beam ports. ### Claim 11 (depends on 10) The method of claim 10, wherein each of the reference signals are scanning reference signals jointly covering a range of spatial directions. ### Claim 12 (depends on 10) The method of claim 10, wherein the one or more transmit antenna ports are located in one or more transmit-receive points (TRPs). ### Claim 13 (depends on 10) The method of claim 10, wherein the information indicating the plurality of reference signals is a CSI reporting configuration, and wherein receiving the one or more reporting sets comprises receiving a CSI report including the one or more reporting sets. ### Claim 14 (depends on 13) The method of claim 13, wherein the CSI reporting configuration indicates a maximum quantity for the one or more reporting sets, and wherein a quantity of reporting sets in the CSI report is less than or equal to the maximum quantity. ### Claim 15 (depends on 10) The method of claim 10, wherein each of the one or more reporting sets indicates the one or more of the transmit beam ports according to indices for the transmit beam ports and indices for the transmit antenna ports associated with the transmit beam ports. ### Claim 16 (depends on 10) The method of claim 10, wherein transmitting the data comprises: transmitting demodulation reference signals on the selected transmit beam ports; and transmitting the data over the selected transmit beam ports according to the transmitted demodulation reference signals. ### Claim 17 (depends on 16) The method of claim 16, wherein transmitting the data comprises: transmitting two demodulation reference signals using the selected transmit beam ports; encoding the data into Alamouti coded data tone pairs; and transmitting the Alamouti coded data tone pairs over two of the selected transmit beam ports according to the two demodulation reference signals. ### Claim 18 (depends on 16) The method of claim 16, wherein the demodulation reference signals are one of code division multiplexed or time division multiplexed, and wherein the demodulation reference signals are scrambled with a scrambling sequence. ### Claim 19 (depends on 10) The method of claim 10, wherein selecting the one or more selected transmit beam ports comprises: selecting one transmit beam port for a first set of the reporting sets in response to the first set indicating one transmit beam port; or selecting two transmit beam ports for the first set in response to the first set indicating more than one transmit beam port. ### Claim 20 (depends on 10) The method of claim 10, wherein selecting the one or more selected transmit beam ports comprises selecting the transmit beam ports in one or more transmit time intervals (TTIs). ### Claim 21 (depends on 20) The method of claim 20, wherein the TTIs are pre-defined intervals. ### Claim 22 (depends on 20) The method of claim 20, further comprising signaling, by the network, the TTIs to the UE. ### Claim 23 A user equipment (UE) with one or more receive antenna ports, each of the receive antenna ports associated with a plurality of receive beam ports, the UE comprising: a processor; and a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions to: receive information from a network indicating configurations of one or more transmit antenna ports, each of the transmit antenna ports associated with a plurality of transmit beam ports, the information further indicating a plurality of reference signals, each of the reference signals associated with one of the transmit beam ports for the transmit antenna ports; receive a subset of the reference signals; measure receive signal quality for each of the subset of the reference signals; determine a selected receive beam port for each of the receive antenna ports according to the receive signal quality measured; derive one or more reporting sets, the one or more reporting sets corresponding to one of the receive antenna ports, each of the reporting sets indicating one or more selected transmit beam ports for the receive antenna port, the one or more reporting sets derived according to the receive signal quality measured; transmit the one or more reporting sets to the network; and receive a data transmission from the selected transmit beam ports using the selected receive beam port for each of the receive antenna ports. ### Claim 24 A network with one or more transmit antenna ports, each of the transmit antenna ports associated with a plurality of transmit beam ports, the network comprising: a processor; and a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions to: send information to a UE indicating configurations of the transmit antenna ports, the information further indicating a plurality of reference signals, each of the reference signals associated with one of the transmit beam ports for the transmit antenna ports; transmit the plurality of reference signals; receive one or more reporting sets from the UE, each of the one or more reporting sets indicating one or more of the transmit beam ports; select one or more selected transmit beam ports for each one of the reporting sets, each of the selected transmit beam ports having different transmit antenna ports; and transmit data using the selected transmit beam ports.