# US 11,310,011 B2 · Physical resource group size for precoded channel state information reference signals > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,310,011 B2 - Document ID: US11310011B2 - Status: Granted - Kind: B2 - Application number: 16/623,009 - Filed: 2018-06-13 - Published: 2021-05-20 - Granted: 2022-04-19 - Earliest claimed: 2017-06-16 - Assignees: QUALCOMM Incorporated - Applicants: Qualcomm Incorporated - Inventors: Chenxi Hao; Yu Zhang; Wanshi Chen; Chao Wei; Liangming Wu - Web page: https://patentgrep.com/patent/US11310011B2 ## 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)} - H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - 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 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - 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, systems, devices, and apparatus for wireless communication are described that relate to transmission of a set of precoded reference signals, and using a physical resource group (PRG) size for the resources carrying the set of reference signals for channel estimation at a user equipment (UE). For example, a base station may apply a precoding matrix to a set of reference signals, and the reference signals may be configured on a set of resources. In such cases, the resources including these reference signals having a same precoding may be included in a PRG, and a size of the PRG may refer to a number of precoded reference signals for which the precoding is the same. Based on the received reference signals and the PRG size the UE may perform channel estimation based on the PRG size and transmit channel state information (CSI) to the base station. ## Claims ### Claim 1 A method for wireless communication at a user equipment (UE), comprising: identifying a first reference signal resource and a second reference signal resource within a same bandwidth, wherein the first reference signal resource and the second reference signal resource each comprise a channel state information reference signal (CSI-RS) resource; determining a first physical resource group (PRG) size associated with the first reference signal resource; determining a second PRG size associated with the second reference signal resource, the second PRG size being different from the first PRG size, wherein each of the first PRG size and the second PRG size is indicative of respective sets of reference signal resources for which a precoding is the same for one or more precoded CSI-RSs; and performing channel estimation using one or more reference signal resources based at least in part on the determined first PRG size and the determined second PRG size. ### Claim 2 (depends on 1) The method of claim 1, further comprising: transmitting channel state information (CSI) parameters based at least in part on the performed channel estimation. ### Claim 3 (depends on 2) The method of claim 2, wherein the CSI parameters comprise at least a channel quality indicator (CQI), a rank indicator (RI), a precoding matrix indicator (PMI), a channel resource indicator (CRI), or any combination thereof. ### Claim 4 (depends on 1) The method of claim 1, wherein each reference signal resource of the one or more reference signal resources is associated with one or more resource sets, and each of the one or more resource sets is associated with one or more resource settings. ### Claim 5 (depends on 1) The method of claim 1, further comprising: receiving a downlink control signal that comprises an indication of the first PRG size and the second PRG size; and determining the first PRG size and the second PRG size based at least in part on the indication. ### Claim 6 (depends on 5) The method of claim 5, wherein the indication indicates the first PRG size and the second PRG size in a resource indication, a resource set configuration, or a resource setting configuration. ### Claim 7 (depends on 6) The method of claim 6, wherein the first PRG size and the second PRG indicated in the resource indication are for a reference signal resource of the one or more reference signal resources to which the resource indication corresponds, the first PRG size and the second PRG size indicated in the resource set configuration are the same for each reference signal resource of the one or more reference signal resources within a resource set to which the resource set configuration corresponds, the first PRG size and the second PRG size indicated in the resource setting configuration are the same for each reference signal resource of the one or more reference signal resources of any resource sets to which the resource setting configuration corresponds, or any combination thereof. ### Claim 8 (depends on 1) The method of claim 1, wherein determining the first PRG size and the second PRG size comprises: receiving at least a first downlink control signal, or a second downlink control signal, or both, wherein the first downlink control signal comprises a first indication of a set of PRG sizes, and wherein the second downlink control signal comprises a second indication of the first PRG size and the second PRG size from the set of PRG sizes; and the method further comprising determining the first PRG size and the second PRG size based at least in part on the first indication, or the second indication, or both. ### Claim 9 (depends on 8) The method of claim 8, wherein each of the first indication and the second indication comprises a downlink control information (DCI) format, a cyclic redundancy check (CRC) scrambling type, or both. ### Claim 10 (depends on 8) The method of claim 8, wherein the first indication of the set of PRG sizes and the second indication of the first PRG size and the second PRG size are a same indication or a different indication used for a second set of PRG sizes associated with a demodulation reference signal (DMRS), wherein the set of PRG sizes are the same as a second set of PRG sizes associated with the DMRS, and wherein the first PRG size and the second PRG size are the same as a third PRG size associated with the DMRS. ### Claim 11 (depends on 8) The method of claim 8, wherein each of the first downlink control signal and the second downlink control signal comprises downlink control information (DCI), a radio resource control (RRC) message, a medium access control (MAC) control element (CE), or a system information block (SIB). ### Claim 12 (depends on 1) The method of claim 1, further comprising: identifying a preferred resource from the first reference signal resource and the second reference signal resource based at least in part on the first PRG size and the second PRG size; and transmitting a channel resource indicator (CRI) signaling the preferred resource. ### Claim 13 (depends on 1) The method of claim 1, wherein a value of the first PRG size and a value of the second PRG size are based at least in part on a PRG size of a demodulation reference signal (DMRS) and data, a multiple of a resource block group (RBG) size, a portion of the RBG size, a system bandwidth, a UE capability, a reference signal pattern, or any combination thereof. ### Claim 14 A method for wireless communication at a base station, comprising: applying a precoding matrix to a first reference signal resource and a second reference signal resource within a same bandwidth, wherein the first reference signal resource and the second reference signal resource each comprise a channel state information reference signal (CSI-RS) resource; configuring a first physical resource group (PRG) size associated with the first reference signal resource; configuring a second PRG size associated with the second reference signal resource, the second PRG size being different from the first PRG size, wherein each of the first PRG size and the second PRG size is indicative of respective sets of reference signal resources for which a precoding is the same for one or more precoded CSI-RSs; and transmitting the one or more precoded CSI-RSs based at least in part on the configured first PRG size and the configured second PRG size. ### Claim 15 (depends on 14) The method of claim 14, wherein each reference signal resource is associated with one or more resource sets, and each of the one or more resource sets is associated with one or more resource settings. ### Claim 16 (depends on 14) The method of claim 14, wherein configuring the PRG size comprises: transmitting a downlink control signal that comprises an indication of the first PRG size and the second PRG size. ### Claim 17 (depends on 16) The method of claim 16, wherein the indication indicates the first PRG size and the second PRG size in a resource indication, a resource set configuration, or a resource setting configuration. ### Claim 18 (depends on 14) The method of claim 14, wherein configuring the first PRG size and the second PRG size comprises: transmitting at least a first downlink control signal, or a second downlink control signal, or both, wherein the first downlink control signal comprises a first indication of a set of PRG sizes, and wherein the second downlink control signal comprises a second indication of the first PRG size and the second PRG size from the set of PRG sizes. ### Claim 19 (depends on 18) The method of claim 18, wherein each of the first indication and the second indication comprises a downlink control information (DCI) format, a cyclic redundancy check (CRC) scrambling type, or both. ### Claim 20 (depends on 18) The method of claim 18, wherein the first indication of the set of PRG sizes and the second indication of the first PRG size and the second PRG size are a same indication or a different indication used for a second set of PRG sizes associated with a demodulation reference signal (DMRS), wherein the set of PRG sizes is the same as a second set of PRG sizes associated with the DMRS, and wherein the first PRG size and the second PRG size are the same as a third PRG size associated with the DMRS. ### Claim 21 (depends on 18) The method of claim 18, wherein each of the first downlink control signal and the second downlink control signal comprises downlink control information (DCI), a radio resource control (RRC) message, a medium access control (MAC) control element (CE), or a system information block (SIB). ### Claim 22 (depends on 14) The method of claim 14, further comprising: receiving, as part of channel state information (CSI) parameters, a channel resource indicator (CRI) signaling a preferred resource based at least in part on the first reference signal resource and the second reference signal resource. ### Claim 23 (depends on 14) The method of claim 14, wherein the first PRG size and the second PRG size are based at least in part on a PRG size of a demodulation reference signal (DMRS) and data, a multiple of a resource block group (RBG) size, a portion of the RBG size, a system bandwidth, a UE capability, a reference signal pattern, or any combination thereof. ### Claim 24 (depends on 14) The method of claim 14, further comprising: receiving channel state information (CSI) parameters from a UE based on the configured first PRG size, the configured second PRG size, or any combination thereof, wherein the CSI parameters comprise at least a channel quality indicator (CQI), a rank indicator (RI), a precoding matrix indicator (PMI), a channel resource indicator (CRI), or any combination thereof. ### Claim 25 An apparatus for wireless communication, comprising: means for identifying a first reference signal resource and a second reference signal resource within a same bandwidth, wherein the first reference signal resource and the second reference signal resource each comprise a channel state information reference signal (CSI-RS) resource; means for determining a first physical resource group (PRG) size associated with the first reference signal resource; means for determining a second PRG size associated with the second reference signal resource, the second PRG size being different from the first PRG size, wherein each of the first PRG size and the second PRG size is indicative of respective sets of reference signal resources for which a precoding is the same for one or more precoded CSI-RSs; and means for performing channel estimation using one or more reference signal resources based at least in part on the determined first PRG size and the determined second PRG size. ### Claim 26 An apparatus for wireless communication, comprising: means for applying a precoding matrix to a first reference signal resource and a second reference signal resource associated with reference signal resources within a same bandwidth, wherein the first reference signal resource and the second reference signal resource each comprise a channel state information reference signal (CSI-RS) resource; means for configuring a first physical resource group (PRG) size associated with the first reference signal resource; means for configuring a second PRG size associated with the second reference signal resource, wherein each of the first PRG size and the second PRG size is indicative of respective sets of reference signal resources for which a precoding is the same for one or more precoded CSI-RSs; and means for transmitting the one or more precoded CSI-RSs based at least in part on the configured first PRG size and the configured second PRG size.