# US 10,771,211 B2 · Method and apparatus for channel state information (CSI) acquisition with DL and UL reference signals > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,771,211 B2 - Document ID: US10771211B2 - Status: Granted - Kind: B2 - Application number: 15/888,766 - Filed: 2018-02-05 - Published: 2018-10-04 - Granted: 2020-09-08 - Earliest claimed: 2017-03-28 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Eko Onggosanusi - Web page: https://patentgrep.com/patent/US10771211B2 ## CPC - H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting - 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 5/0023: {Time-frequency-space} - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0092: {Indication of how the channel is divided} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 88/02: Terminal devices - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - 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 channel state information (CSI) acquisition with downlink (DL) and uplink (UL) reference signals (RSs). A UE apparatus includes a transceiver and a processor operably connected to the transceiver. The transceiver is configured to receive (i) configuration information for a CSI-RS and a sounding reference signal (SRS) and (ii) downlink control information (DCI) that includes a DCI field for an aperiodic SRS transmission request. The processor is configured to decode the configuration information and the DCI with the aperiodic SRS transmission request. The transceiver is further configured to receive the CSI-RS and transmit the SRS. The SRS corresponds to a higher-layer configured SRS resource and a number of configured SRS resources is more than one. ## Claims ### Claim 1 A user equipment (UE), comprising: a transceiver configured to receive (i) configuration information for configuring a channel state information reference signal (CSI-RS) and indicating a plurality of higher-layer configured sounding reference signal (SRS) resources, and (ii) downlink control information (DCI) that includes a DCI field for an aperiodic SRS transmission request; and a processor operably connected to the transceiver, the processor configured to decode the configuration information and the DCI with the aperiodic SRS transmission request, wherein the transceiver is further configured to receive the CSI-RS and transmit the SRS, wherein the CSI-RS corresponds to at least one higher-layer configured non-zero-power (NZP) CSI-RS resource, wherein the NZP CSI-RS resource is measured to calculate a precoder used for the transmitted SRS, and wherein the DCI field is also used to indicate presence of the CSI-RS in a same DL slot as the DCI. ### Claim 2 (depends on 1) The UE of claim 1, wherein the DCI field comprises aperiodic SRS triggering states associated with the configured SRS resources. ### Claim 3 (depends on 2) The UE of claim 2, wherein a number of configured NZP CSI-RS resources is one. ### Claim 4 (depends on 2) The UE of claim 2, wherein a number of configured NZP CSI-RS resources is more than one and an association between the aperiodic SRS triggering states and the configured SRS resources also includes an association with the configured NZP CSI-RS resources. ### Claim 5 A base station (BS), comprising: a processor configured to generate (i) configuration information for configuring a channel state information reference signal (CSI-RS) and indicating a plurality of higher-layer configured sounding reference signal (SRS) resources, and (ii) downlink control information (DCI) that includes a DCI field for requesting transmission of an aperiodic SRS; and a transceiver operably connected to the processor, the transceiver configured to: transmit, to a UE, the configuration information and the DCI via a downlink (DL) channel and the CSI-RS, and receive, from the UE, the requested aperiodic SRS, wherein the CSI-RS corresponds to at least one higher-layer configured non-zero-power (NZP) CSI-RS resource, wherein the NZP CSI-RS resource is measured to calculate a precoder used for the received SRS, and wherein the DCI field is also used to indicate presented of the CSI-RS in a same DL slot as the DCI. ### Claim 6 (depends on 5) The BS of claim 5, wherein the DCI field comprises aperiodic SRS triggering states associated with the configured SRS resources. ### Claim 7 (depends on 6) The BS of claim 6, wherein an association between the aperiodic SRS triggering states and the configured SRS resources also includes an association with the configured NZP CSI-RS resources. ### Claim 8 A method for operating a user equipment (UE), the method comprising: receiving and decoding (i) configuration information for configuring a channel state information reference signal (CSI-RS) and indicating a plurality of higher-layer configured sounding reference signal (SRS) resources blocks in which the SRS is transmitted, and (ii) downlink control information (DCI) that includes a DCI field for requesting an aperiodic SRS transmission; and receiving the CSI-RS and transmitting the SRS, wherein the CSI-RS corresponds to at least one higher-layer configured non-zero-power (NZP) CSI-RS resource, wherein the NZP CSI-RS resource is measured to calculate a precoder used for the transmitted SRS, and wherein the DCI field is also used to indicate presence of the CSI-RS in a same DL slot as the DCI. ### Claim 9 (depends on 8) The method of claim 8, wherein the DCI field comprises aperiodic SRS triggering states associated with the configured SRS resources. ### Claim 10 (depends on 9) The method of claim 9, wherein a number of configured NZP CSI-RS resources is one. ### Claim 11 (depends on 9) The method of claim 9, wherein a number of configured NZP CSI-RS resources is more than one and an association between the aperiodic SRS triggering states and the configured SRS resources also includes an association with the configured NZP CSI-RS resources.