# US 11,310,013 B2 · CSI-RS design with dynamic subframe structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,310,013 B2 - Document ID: US11310013B2 - Status: Granted - Kind: B2 - Application number: 16/672,411 - Filed: 2019-11-01 - Published: 2020-02-27 - Granted: 2022-04-19 - Earliest claimed: 2016-05-18 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Muhammad Nazmul Islam; Tao Luo; Sundar Subramanian; Bilal Sadiq; Juergen Cezanne; Junyi Li - Web page: https://patentgrep.com/patent/US11310013B2 ## CPC - 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 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04W 72/0446: Resources in time domain, e.g. slots or frames - 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, systems, and devices for wireless communication are described. A base station and user equipment (UE) may use subframe configurations that include dynamically scheduled channel state information reference signal (CSI-RS) symbols. For example, a base station may identify a subframe configuration that includes one or more sets of CSI-RS symbols of a subframe. The base station may indicate to a UE whether sets of CSI-RS symbols may be enabled or disabled during the subframe. The UE may receive multiple CSI-RSs at different locations within the subframe as indicated by the base station, and transmit CSI feedback to the base station based on at least one of the received CSI-RSs. In some examples, multiple base stations may coordinate the use of subframe configurations that include CSI-RS symbols that may be enabled or disabled. ## Claims ### Claim 1 A method for wireless communication, comprising: receiving an indication of a subframe configuration; canceling reception associated with at least one set of channel state information reference signal (CSI-RS) resources from a plurality of sets of CSI-RS resources based at least in part on the subframe configuration defining a symbol as an uplink symbol; and receiving one or more CSI-RSs at corresponding locations in a subframe in accordance with the indication. ### Claim 2 (depends on 1) The method of claim 1, wherein the one or more CSI-RSs are received in symbols of the subframe occupied by physical downlink shared channel (PDSCH) or physical uplink shared channel (PUSCH). ### Claim 3 (depends on 1) The method of claim 1, wherein receiving one or more CSI-RSs comprises receiving multiple CSI-RSs at corresponding locations in a subframe in accordance with the indication, the method further comprising: transmitting one or more instances of CSI feedback based at least in part on the received multiple CSI-RSs. ### Claim 4 (depends on 3) The method of claim 3, wherein transmitting one or more instances of CSI feedback comprises transmitting an instance of CSI feedback corresponding to a first CSI-RS of the multiple CSI-RSs, the method further comprising: refraining from transmitting CSI feedback corresponding to a second CSI-RS of the multiple CSI-RSs associated with the canceling the reception associated with the at least one set of CSI-RS resources. ### Claim 5 (depends on 3) The method of claim 3, wherein transmitting one or more instances of CSI feedback comprises transmitting an instance of CSI feedback corresponding to each of the multiple CSI-RSs. ### Claim 6 (depends on 3) The method of claim 3, further comprising: receiving, by a user equipment (UE), dynamic or radio resource control (RRC) signaling from a base station indicating whether one or more instances of CSI-RS feedback are to be transmitted to the base station. ### Claim 7 (depends on 1) The method of claim 1, wherein the plurality of sets of CSI-RS resources includes resources mapped to two non-overlapping sets of CSI-RS symbols, wherein the indication indicates that one of the two non-overlapping sets of CSI-RS symbols is enabled and that another of the two non-overlapping sets of CSI-RS symbols is disabled. ### Claim 8 (depends on 1) The method of claim 1, wherein the indication indicates that a first set of CSI-RS resources of the one or more sets of CSI-RS resources comprising resources in a first symbol of the subframe is to be enabled and a second set of CSI-RS resources of the one or more sets of CSI-RS resources comprising resources in a second symbol of the subframe is to be enabled. ### Claim 9 (depends on 8) The method of claim 8, wherein the first set of CSI-RS resources comprising resources in the first symbol of the subframe corresponds to a temporal location of a data portion of the subframe. ### Claim 10 (depends on 1) The method of claim 1, wherein the indication is signaled dynamically via a control channel or is signaled via radio resource control (RRC). ### Claim 11 (depends on 1) The method of claim 1, further comprising: transmitting one or more bits in downlink control information to convey the indication. ### Claim 12 (depends on 1) The method of claim 1, wherein the one or more CSI-RSs are received over millimeter wave (mmW) frequency resources. ### Claim 13 A method for wireless communication, comprising: transmitting an indication of a subframe configuration that indicates at least one set of channel state information reference signal (CSI-RS) resources from a plurality of sets of CSI-RS resources is to be canceled; and transmitting one or more CSI-RSs at corresponding locations in a subframe in accordance with the indication. ### Claim 14 (depends on 13) The method of claim 13, wherein transmitting one or more CSI-RSs comprises transmitting multiple CSI-RSs at corresponding locations in a subframe in accordance with the indication, the method further comprising: receiving one or more instances of CSI feedback based at least in part on the transmitted multiple CSI-RSs. ### Claim 15 (depends on 14) The method of claim 14, wherein receiving one or more instances of CSI feedback comprises receiving an instance of CSI feedback corresponding to a first CSI-RS of the multiple CSI-RSs and an absence of CSI feedback corresponding to a second CSI-RS of the multiple CSI-RSs based at least in part on the indication. ### Claim 16 (depends on 14) The method of claim 14, wherein receiving one or more instances of CSI feedback comprises receiving an instance of CSI feedback corresponding to each of the multiple CSI-RSs based at least in part on the indication. ### Claim 17 (depends on 14) The method of claim 14, further comprising: transmitting, by a base station, dynamic or radio resource control (RRC) signaling to a user equipment (UE) indicating whether one or more instances of CSI-RS feedback are to be transmitted by the UE. ### Claim 18 An apparatus for wireless communications, comprising: a processor of a user equipment (UE); a transceiver coupled with the processor; and memory coupled with the processor, the memory and the processor configured to cause the apparatus to: receive an indication of a subframe configuration; cancel reception associated with at least one set that one or more sets of channel state information reference signal (CSI-RS) resources from a plurality of sets of CSI-RS resources based at least in part on the subframe configuration defining a symbol as an uplink symbol; and receive one or more CSI-RSs at corresponding locations in a subframe in accordance with the indication. ### Claim 19 (depends on 18) The apparatus of claim 18, wherein the memory and the processor configured to receive one or more CSI-RSs are further configured to cause the apparatus to: receive the one or more CSI-RSs in symbols of the subframe occupied by physical downlink shared channel (PDSCH) or physical uplink shared channel (PUSCH). ### Claim 20 (depends on 18) The apparatus of claim 18, wherein the memory and the processor configured to receive one or more CSI-RSs are further configured to cause the apparatus to: receive multiple CSI-RSs at corresponding locations in a subframe in accordance with the indication, the memory and the processor further configured to cause the apparatus to: transmit one or more instances of CSI feedback based at least in part on the received multiple CSI-RSs. ### Claim 21 (depends on 20) The apparatus of claim 20, wherein the memory and the processor configured to transmit one or more instances of CSI feedback are further configured to cause the apparatus to: transmit an instance of CSI feedback corresponding to a first CSI-RS of the multiple CSI-RSs, the memory and the processor further configured to cause the apparatus to: refrain from transmitting CSI feedback corresponding to a second CSI-RS of the multiple CSI-RSs associated with the canceling the reception associated with the at least one set of CSI-RS resources. ### Claim 22 (depends on 20) The apparatus of claim 20, wherein the memory and the processor configured to transmit one or more instances of CSI feedback are further configured to cause the apparatus to: transmit an instance of CSI feedback corresponding to each of the multiple CSI-RSs. ### Claim 23 (depends on 20) The apparatus of claim 20, the memory and the processor further configured to cause the apparatus to: receive, by the UE, dynamic or radio resource control (RRC) signaling from a base station indicating whether one or more instances of CSI-RS feedback are to be transmitted to the base station. ### Claim 24 (depends on 18) The apparatus of claim 18, wherein the plurality of sets of CSI-RS resources includes resources mapped to two non-overlapping sets of CSI-RS symbols, wherein the indication indicates that one of the two non-overlapping sets of CSI-RS symbols is enabled and that another of the two non-overlapping sets of CSI-RS symbols is disabled. ### Claim 25 (depends on 18) The apparatus of claim 18, wherein the indication indicates that a first set of CSI-RS resources of the one or more sets of CSI-RS resources comprising resources in a first symbol of the subframe is to be enabled and a second set of CSI-RS resources of the one or more sets of CSI-RS resources comprising resources in a second symbol of the subframe is to be enabled. ### Claim 26 (depends on 25) The apparatus of claim 25, wherein the first set of CSI-RS resources comprising resources in the first symbol of the subframe corresponds to a temporal location of a data portion of the subframe. ### Claim 27 A apparatus for wireless communication, comprising: a processor of a base station; a transceiver coupled with the processor; and memory coupled with the processor, the memory and the processor configured to cause the apparatus to: transmit an indication of a subframe configuration that indicates at least one set of channel state information reference signal (CSI-RS) resources from a plurality of sets of CSI-RS resources is to be canceled; and transmit one or more CSI-RSs at corresponding locations in a subframe in accordance with the indication. ### Claim 28 (depends on 27) The apparatus of claim 27, wherein the memory and the processor configured to transmit one or more CSI-RSs are further configured to cause the apparatus to: transmit multiple CSI-RSs at corresponding locations in a subframe in accordance with the indication, the memory and the processor further configured to cause the apparatus to: receive one or more instances of CSI feedback based at least in part on the transmitted multiple CSI-RSs. ### Claim 29 (depends on 28) The apparatus of claim 28, wherein the memory and the processor configured to receive one or more instances of CSI feedback are further configured to cause the apparatus to: receive an instance of CSI feedback corresponding to a first CSI-RS of the multiple CSI-RSs and an absence of CSI feedback corresponding to a second CSI-RS of the multiple CSI-RSs based at least in part on the indication. ### Claim 30 (depends on 28) The apparatus of claim 28, wherein the memory and the processor configured to receive one or more instances of CSI feedback are further configured to cause the apparatus to: receive an instance of CSI feedback corresponding to each of the multiple CSI-RSs based at least in part on the indication.