# US 9,438,451 B2 · CSI-RS antenna ports extension and 3D codebook design > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,438,451 B2 - Document ID: US9438451B2 - Status: Granted - Kind: B2 - Application number: 14/128,338 - Filed: 2013-09-27 - Published: 2015-06-25 - Granted: 2016-09-06 - Earliest claimed: 2013-09-27 - Assignees: Intel Corporation - Applicants: Intel Corporation - Inventors: Xiaogang Chen; Yuan Zhu; Qinghua Li; Alexei V. Davydov; Hooman Shirani-Mehr - Web page: https://patentgrep.com/patent/US9438451B2 ## CPC - H04L 25/03929: {with layer mapping, e.g. codeword-to layer design (for space-time coding H04L1/0618)} - H04B 7/0413: MIMO systems - H04B 7/0417: Feedback systems - H04B 7/0479: {for multi-dimensional arrays, e.g. horizontal or vertical pre-distortion matrix index [PMI]} - H04B 7/0617: {for beam forming} - H04B 17/24: with feedback of measurements to the transmitter - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION ## Abstract A system and a method is disclosed for selecting at least one vertical precoding vector of a three-dimensional Multiple Input Multiple Output (3D-MIMO) configuration based on Channel State Information-Reference Signal (CSI-RS) information that is feedback from a wireless terminal device to an evolved Node B (eNB). The 3D-MIMO CSI-RS process is configured for a plurality of CSI-RS ports in which the plurality of CSI-RS ports that are grouped into a plurality of CSI-RS port groups and in which corresponds to the 3D arrangement of antennas. CSI configuration information for the different CSI-RS port groups can be a time-domain-based CSI-RS process, a frequency-domain-based CSI-RS process, a code-domain-based CSI-RS process, or a combination thereof. CSI-RS information is measured for each CSI-RS group and feedback for selection of the at least one vertical precoding vector. ## Claims ### Claim 1 A method to measure Channel State Information-Reference Signal (CSI-RS) information for a three-dimensional Multiple Input Multiple Output (3D-MIMO) configuration of a 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) wireless network, the method comprising: receiving at a wireless terminal device Channel State Information (CSI) configuration information for a plurality of CSI-RS ports, the plurality of CSI-RS ports corresponding to a 3D arrangement of antennas and being grouped into a plurality of CSI-RS port groups, wherein the plurality of CSI-RS ports comprises greater than eight CSI-RS ports, and wherein each of the plurality of CSI-RS port groups comprises a corresponding CSI process; measuring at the wireless terminal device CSI-RS information corresponding to each respective CSI-RS group, wherein a first combination of the CSI processes is performed in a first group of physical resource blocks, and a second combination of the CSI processes performed in a second group of physical resource blocks, the second combination being different from the first combination, until CSI-RS measurements have been obtained for the greater than eight CSI-RS ports; and sending from the wireless terminal device the CSI-RS information as feedback for selecting at least one vertical precoding vector for configuring the CSI-RS ports of the 3D antenna arrangement. ### Claim 2 (depends on 1) The information-handling system according to claim 1, wherein the CSI configuration information comprises configuration information for a time-domain-based CSI-RS process in which the measured CSI-RS information for each respective CSI-RS group is measured with a different time offset from other CSI-RS groups, a frequency-domain-based CSI-RS process in which the measured CSI-RS information for each respective CSI-RS group is measured in different Physical Resource Blocks (PRBs) that have been interlaced in the frequency domain, a code-domain-based CSI-RS process, or a combination thereof. ### Claim 3 (depends on 1) The method according to claim 1, wherein the CSI configuration information comprises configuration information for a code-domain-based CSI-RS process that is initialized specifically for the wireless terminal device. ### Claim 4 (depends on 1) The method according to claim 1, further comprising: receiving at an evolved Node B (eNB) of the 3GPP LTE wireless network the feedback CSI-RS information; and selecting the at least one vertical precoding vector for configuring the CSI-RS ports of the 3D antenna arrangement. ### Claim 5 (depends on 4) The method according to claim 4, wherein the at least one selected vertical precoding vector comprises WV=[WV1, WV2, . . . , WVrV] in which WVi for i=1, 2, . . . , rV comprises a NV×1 vector, NV represents the number of antenna ports having the same index and in which rV represents the number of vertical rank in MIMO transmission. ### Claim 6 (depends on 5) The method according to claim 5, wherein the at least one selected vertical precoding vector is selected based on a number of antenna ports comprising a same index and to correspond to horizontal precoding vectors comprising the same antenna port index. ### Claim 7 (depends on 6) The method according to claim 6, wherein W V i = [ 1 exp ⁡ ( - j ⁢ ⁢ 2 ⁢ ⁢ π ⁢ d λ ⁢ cos ⁡ ( θ i ) ) ⋮ exp ⁡ ( - j ⁢ ⁢ 2 ⁢ ⁢ π ⁢ r V ⁢ d λ ⁢ cos ⁡ ( θ i ) ) ] , 0 < θ i < π in which d comprises a distance between different antenna elements and λ comprises a wavelength. ### Claim 8 A method to select at least one precoding vector for a three-dimensional Multiple Input Multiple Output (3D-MIMO) configuration of a 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) wireless network, the method comprising: sending from an evolved Node B (eNB) of the 3GPP LTE wireless network to a wireless terminal device Channel State Information (CSI) configuration information for a plurality of Channel State Information-Reference Signal (CSI-RS) ports at the eNB, the plurality of CSI-RS ports corresponding to a 3D arrangement of antennas and being grouped into a plurality of CSI-RS port groups, wherein the plurality of CSI-RS ports comprises greater than eight CSI-RS ports, and wherein each of the plurality of CSI-RS port groups comprises a corresponding CSI process, and wherein a first combination of the CSI processes is performed in a first group of physical resource blocks, and a second combination of the CSI processes performed in a second group of physical resource blocks, the second combination being different from the first combination; and receiving at the eNB from the wireless terminal device CSI-RS information as feedback; and selecting at least one vertical precoding vector for configuring the CSI-RS ports of the 3D antenna arrangement. ### Claim 9 (depends on 8) The information-handling system according to claim 8, wherein the CSI configuration information comprises configuration information for a time-domain-based CSI-RS process in which the measured CSI-RS information for each respective CSI-RS group is measured with a different time offset from other CSI-RS groups, a frequency-domain-based CSI-RS process in which the measured CSI-RS information for each respective CSI-RS group is measured in different Physical Resource Blocks (PRBs) that have been interlaced in the frequency domain, a code-domain-based CSI-RS process, or a combination thereof. ### Claim 10 (depends on 8) The method according to claim 8, wherein the CSI configuration information comprises configuration information for a code-domain-based CSI-RS process that is initialized specifically for the wireless terminal device. ### Claim 11 (depends on 8) The method according to claim 8, wherein the at least one selected vertical precoding vector comprises WV=└WV1, WV2, . . . , WVrV┘ in which WVi for i=1, 2, . . . , rV comprises a NV×1 vector, NV represents the number of antenna ports having the same index and in which rV represents the number of vertical rank in MIMO transmission. ### Claim 12 (depends on 11) The method according to claim 11, wherein the at least one selected vertical precoding vector is selected based on a number of antenna ports comprising a same index and to correspond to horizontal precoding vectors comprising the same antenna port index. ### Claim 13 (depends on 11) The method according to claim 11, wherein W V i = [ 1 exp ⁡ ( - j ⁢ ⁢ 2 ⁢ ⁢ π ⁢ d λ ⁢ cos ⁡ ( θ i ) ) ⋮ exp ⁡ ( - j ⁢ ⁢ 2 ⁢ ⁢ π ⁢ r V ⁢ d λ ⁢ cos ⁡ ( θ i ) ) ] , 0 < θ i < π in which d comprises a distance between different antenna elements and λ comprises a wavelength. ### Claim 14 An information-handling system, comprising: a receiver capable of receiving a 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) signal containing Channel State Information (CSI) configuration information for a plurality of CSI-RS ports, the plurality of CSI-RS ports corresponding to a 3D arrangement of antennas and being grouped into a plurality of CSI-RS port groups, wherein the plurality of CSI-RS ports comprises greater than eight CSI-RS ports, and wherein each of the plurality of CSI-RS port groups comprises a corresponding CSI process; a processor coupled to the receiver, the processor being configured to measure CSI-RS information corresponding to each respective CSI-RS group, wherein a first combination of the CSI processes is performed in a first group of physical resource blocks, and a second combination of the CSI processes performed in a second group of physical resource blocks, the second combination being different from the first combination, until CSI-RS measurements have been obtained for the greater than eight CSI-RS ports; and send the CSI-RS information as feedback for selecting at least one vertical precoding vector for configuring the CSI-RS ports of the 3D antenna arrangement. ### Claim 15 (depends on 14) The information-handling system according to claim 14, wherein the CSI configuration information comprises configuration information for a time-domain-based CSI-RS process in which the measured CSI-RS information for each respective CSI-RS group is measured with a different time offset from other CSI-RS groups, a frequency-domain-based CSI-RS process in which the measured CSI-RS information for each respective CSI-RS group is measured in different Physical Resource Blocks (PRBs) that have been interlaced in the frequency domain, a code-domain-based CSI-RS process, or a combination thereof. ### Claim 16 (depends on 14) The information-handling system according to claim 14, wherein the CSI configuration information comprises configuration information for a code-domain-based CSI-RS process that is initialized specifically for the wireless terminal device. ### Claim 17 (depends on 14) The information-handling system according to claim 14, wherein the information-handling system comprises a cellular telephone, smartphone, smart-type device, or tablet-type device. ### Claim 18 (depends on 17) The information-handling system according to claim 17, wherein the cellular telephone, smartphone, smart-type device, or tablet-type device further comprises a touchscreen display capable of receiving input information from a touch of a user or a stylus. ### Claim 19 An information-handling system, comprising: a transmitter capable of transmitting a 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) signal containing Channel State Information (CSI) configuration information for a plurality of CSI-RS ports, the plurality of CSI-RS ports corresponding to a 3D arrangement of antennas and being grouped into a plurality of CSI-RS port groups, wherein the plurality of CSI-RS ports comprises greater than eight CSI-RS ports, and wherein each of the plurality of CSI-RS port groups comprises a corresponding CSI process, and wherein a first combination of the CSI processes is performed in a first group of physical resource blocks, and a second combination of the CSI processes performed in a second group of physical resource blocks, the second combination being different from the first combination; a receiver capable of receiving CSI-RS information as feedback; and a processor coupled to the receiver configured to select at least one vertical precoding vector for configuring the CSI-RS ports of the 3D antenna arrangement. ### Claim 20 (depends on 19) The information-handling system according to claim 19, wherein the CSI configuration information comprises configuration information for a time-domain-based CSI-RS process in which the measured CSI-RS information for each respective CSI-RS group is measured with a different time offset from other CSI-RS groups, a frequency-domain-based CSI-RS process in which the measured CSI-RS information for each respective CSI-RS group is measured in different Physical Resource Blocks (PRBs) that have been interlaced in the frequency domain, a code-domain-based CSI-RS process, or a combination thereof. ### Claim 21 (depends on 19) The information-handling system according to claim 19, wherein the CSI configuration information comprises configuration information for a code-domain-based CSI-RS process that is initialized specifically for the wireless terminal device. ### Claim 22 (depends on 19) The information-handling system according to claim 19, wherein the at least one selected vertical precoding vector comprises WV=└WV1, WV2, . . . , WVrV┘ in which WVi for i=1, 2, . . . , rV comprises a NV×1 vector, NV represents the number of antenna ports having the same index and in which rV represents the number of vertical rank in MIMO transmission. ### Claim 23 (depends on 22) The information-handling system according to claim 22, wherein the at least one selected vertical precoding vector is selected based on a number of antenna ports comprising a same index and to correspond to horizontal precoding vectors comprising the same antenna port index. ### Claim 24 (depends on 22) The information-handling system according to claim 22, wherein W V i = [ 1 exp ⁡ ( - j ⁢ ⁢ 2 ⁢ ⁢ π ⁢ d λ ⁢ cos ⁡ ( θ i ) ) ⋮ exp ⁡ ( - j ⁢ ⁢ 2 ⁢ ⁢ π ⁢ r V ⁢ d λ ⁢ cos ⁡ ( θ i ) ) ] , 0 < θ i < π in which d comprises a distance between different antenna elements and λ comprises a wavelength.