# US 10,374,672 B2 · Method and apparatus for channel state information (CSI) reporting > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,374,672 B2 - Document ID: US10374672B2 - Status: Granted - Kind: B2 - Application number: 15/966,235 - Filed: 2018-04-30 - Published: 2018-08-30 - Granted: 2019-08-06 - Earliest claimed: 2015-05-06 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd - Inventors: Eko Onggosanusi; Young-Han Nam - Web page: https://patentgrep.com/patent/US10374672B2 ## CPC - H04B 7/0478: {Special codebook structures directed to feedback optimisation} - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04B 7/063: {Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection} - H04B 7/0639: {Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection} - H04W 28/18: Negotiating wireless communication parameters - H04W 88/02: Terminal devices - 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 Methods and apparatuses for CSI reporting mechanisms are provided. A user equipment (UE) apparatus includes a transceiver and a processor. The transceiver is configured to receive configuration information for channel state information (CSI) reporting and receive configuration information for a plurality of precoding codebook parameters. The processor is operably connected to the transceiver, and configured to calculate, in response to receipt of the configuration information for the CSI reporting and the configuration information for the plurality of precoding codebook parameters, a first precoding matrix indicator (PMI) and a second PMI, wherein the first PMI includes one or two codebook indices. The transceiver is further configured to transmit the CSI reporting on an uplink channel, the CSI reporting including a channel quality indicator (CQI), a rank indicator (RI), and the calculated first and second PMIs. ## Claims ### Claim 1 A user equipment (UE) comprising: a transceiver configured to receive configuration information for a channel state information (CSI) reporting, wherein the configuration information includes a plurality of precoding codebook parameters, the plurality of precoding codebook parameters including a number of rows and columns of a codebook; and a processor operably connected to the transceiver, the processor configured to determine, in response to receipt of the configuration information for the CSI reporting and the plurality of precoding codebook parameters including the number of rows and columns, a first precoding matrix indicator (PMI) and a second PMI, wherein the first PMI includes one codebook index when one of the number of rows and columns of the codebook equals one, wherein the first PMI includes two codebook indices when each of the number of rows and columns of the codebook is greater than one, and wherein the transceiver is further configured to transmit the CSI reporting on an uplink channel, the CSI reporting including the determined first and second PMIs. ### Claim 2 (depends on 1) The UE of claim 1, wherein: the two codebook indices of the first PMI are reported with a same frequency granularity and concatenated into a bit sequence. ### Claim 3 (depends on 1) The UE of claim 1, wherein a frequency granularity of a first codebook index of the first PMI is separately configured from that of a second codebook index of the first PMI for aperiodic CSI reporting. ### Claim 4 (depends on 1) The UE of claim 1, wherein the CSI reporting further includes a channel quality indicator (CQI). ### Claim 5 (depends on 4) The UE of claim 4, wherein a frequency granularity of the CQI is separately configured from that of the PMIs for aperiodic CSI reporting using two configuration parameters. ### Claim 6 (depends on 4) The UE of claim 4, wherein time granularity of the CQI is separately configured from that of the PMIs for periodic CSI reporting. ### Claim 7 (depends on 1) The UE of claim 1, wherein a frequency granularity of a first of the one or two codebook indices of the first PMI is separately configured from that of a second of the one or two codebook indices of the first PMI for aperiodic CSI reporting using two configuration parameters. ### Claim 8 A base station (BS) comprising: a transceiver; and a processor operably connected to the transceiver, the processor configured to: generate a plurality of precoding codebook parameters, the plurality of precoding codebook parameters including a number of rows and columns of a codebook; cause the transceiver to transmit, to a user equipment (UE), configuration information for channel state information (CSI) reporting and the plurality of precoding codebook parameters, including the number of rows and columns; and receive a CSI report from the UE generated responsive to the transmitted configuration information transmitted from the BS including codebook indices from first and second precoding matrix indicators (PMIs), wherein the first PMI includes a codebook index when one of the number of rows and columns of the codebook equals one, and wherein the first PMI includes two codebook indices when each of the number of rows and columns of the codebook is greater than one. ### Claim 9 (depends on 8) The BS of claim 8, wherein: the codebook indices of the first PMI within the CSI report generated by the UE and received at the BS are reported with a same frequency granularity and concatenated into a bit sequence. ### Claim 10 (depends on 8) The BS of claim 8, wherein a frequency granularity of a first codebook index of the first PMI within the CSI report generated by the UE and received at the BS is separately configured from that of a second codebook index of the first PMI within the CSI report generated by the UE and received at the BS for aperiodic CSI reporting. ### Claim 11 (depends on 8) The BS of claim 8, wherein the CSI reporting further includes a channel quality indicator (CQI). ### Claim 12 (depends on 11) The BS of claim 11, wherein a frequency granularity of the CQI within the CSI report generated by the UE and received at the BS is separately configured from that of the first PMI within the CSI report generated by the UE and received at the BS for aperiodic CSI reporting. ### Claim 13 (depends on 8) The BS of claim 8, wherein a frequency granularity of a first codebook index of the first PMI within the CSI report generated by the UE and received at the BS is separately configured from that of a second codebook index of the first PMI within the CSI report generated by the UE and received at the BS for aperiodic CSI reporting using two configuration parameters. ### Claim 14 A method for operating a user equipment (UE), the method comprising: receiving, by the UE, configuration information for a channel state information (CSI) reporting, wherein the configuration information includes a plurality of precoding codebook parameters, the plurality of precoding codebook parameters including a number of rows and columns of a codebook; and in response to receipt of the configuration information for the CSI reporting and the plurality of precoding codebook parameters including the number of rows and columns, determining, by the UE, a first precoding matrix indicator (PMI) and a second PMI, wherein the first PMI includes one codebook index when one of the number of rows and columns of the codebook equals one, wherein the first PMI includes two codebook indices when each of the number of rows and columns of the codebook is greater than one, and transmitting, by the UE, the CSI reporting on an uplink channel, the CSI reporting including the determined first and second PMIs. ### Claim 15 (depends on 14) The method of claim 14, wherein: the two codebook indices of the first PMI are reported with a same frequency granularity and concatenated into a bit sequence. ### Claim 16 (depends on 14) The method of claim 14, wherein a frequency granularity of a first codebook index of the first PMI is separately configured from that of a second codebook index of the first PMI for aperiodic CSI reporting. ### Claim 17 (depends on 14) The method of claim 14, wherein the CSI reporting further includes a channel quality indicator (CQI). ### Claim 18 (depends on 17) The method of claim 17, wherein a frequency granularity of the CQI is separately configured from that of the PMI for aperiodic CSI reporting using two configuration parameters. ### Claim 19 (depends on 17) The method of claim 17, wherein time granularity of the CQI is separately configured from that of the PMIs for periodic CSI reporting. ### Claim 20 (depends on 14) The method of claim 14, wherein a frequency granularity of a first of the one or two codebook indices of the first PMI is separately configured from that of a second of the one or two codebook indices of the first PMI for aperiodic CSI reporting using two configuration parameters.