# US 2021/0242913 A1 · Maximum mimo layer aware dl positioning reference signal (prs) reception > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242913 A1 - Document ID: US20210242913A1 - Status: Published application - Kind: A1 - Application number: 16/996,321 - Filed: 2020-08-18 - Published: 2021-08-05 - Earliest claimed: 2020-01-30 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Alexandros MANOLAKOS; Weimin DUAN; Krishna Kiran MUKKAVILLI - Web page: https://patentgrep.com/patent/US20210242913A1 ## CPC - H04B 7/0473: {taking constraints in layer or codeword to antenna mapping into account} - H04B 7/0691: {using subgroups of transmit antennas} - H04B 7/0413: MIMO systems - H04B 7/043: {using best eigenmode, e.g. beam forming or beam steering} - H04B 7/0628: {Diversity capabilities} - H04B 7/0636: {Feedback format} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0023: {Time-frequency-space} - 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 5/0064: {Rate requirement of the data, e.g. scalable bandwidth, data priority} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04W 64/00: Locating users or terminals {or network equipment} for network management purposes, e.g. mobility management - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 72/51: based on terminal or device properties - H04L 5/006: {Quality of the received signal, e.g. BER, SNR, water filling} - 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 A user equipment (UE) receives a maximum downlink (DL) Multiple-Input Multiple-Output (MIMO) layer configuration for DL communications, such as control signals or data signals, in one or more bandwidth parts (BWPs) and a positioning reference signal (PRS) configuration for receiving DL PRS. The UE receives DL PRS in an active BWP using a number of reception antennas based on, e.g., at least equal to, the maximum number of DL MIMO layers in the active bandwidth part. The UE may be configured to transmit uplink (UL) PRS, e.g., SRS for positioning purposes, using at least a maximum number of transmission antennas that is configured for communications purposes. ## Claims ### Claim 1 A method for positioning of a user equipment (UE) performed by the UE, comprising: receiving a positioning reference signal (PRS) configuration for receiving PRS; receiving an indication of a maximum number of downlink (DL) Multiple-Input Multiple-Output (MIMO) layers that will be used to transmit communication signals comprising control signals or data signals to the UE in each bandwidth part (BWP) in one or more bandwidth parts, wherein each bandwidth part comprises a set of frequency resources of a component carrier of a radio frequency (RF) spectrum band; and receiving a PRS in an active bandwidth part using a number of antennas based on the maximum number of DL MIMO layers in the active bandwidth part. ### Claim 2 (depends on 1) The method of claim 1, wherein the number of antennas based on the maximum number of DL MIMO layers in the active bandwidth part comprises the number of antennas at least equal to the maximum number of DL MIMO layers in the active bandwidth part. ### Claim 3 (depends on 1) The method of claim 1, further comprising adjusting accuracy requirement for a PRS measurement based on the number of antennas used to receive the PRS based on the maximum number of DL MIMO layers in the active bandwidth part. ### Claim 4 (depends on 1) The method of claim 1, wherein no measurement gaps are configured for the PRS received in the active bandwidth part; and wherein when measurement gaps are configured for receiving a second PRS, the method further comprises: receiving an indication of a cell specific maximum number of DL MIMO layers that will be used by a base station to transmit the communication signals to the UE; receiving the second PRS using a second number of antennas based on the cell specific maximum number of DL MIMO layers. ### Claim 5 (depends on 1) The method of claim 1, wherein the PRS comprises a PRS resource or an aggregate PRS spanning across multiple active bandwidth parts, and receiving the PRS in the active bandwidth part using the number of antennas based on the maximum number of DL MIMO layers in the active bandwidth part comprises receiving the PRS resource or the aggregate PRS spanning across multiple active bandwidth parts using the number of antennas which is based on one of a minimum or a maximum number of antennas configured by the maximum number of DL MIMO layers in the multiple active bandwidth parts or using the number of antennas configured by a location server. ### Claim 6 (depends on 5) The method of claim 5, wherein the aggregate PRS spanning across multiple active bandwidth parts comprises a collection of PRS resources or sets of PRS resources that the UE is expected to process jointly. ### Claim 7 (depends on 5) The method of claim 5, wherein each active bandwidth part is in a different component carrier of the RF spectrum band. ### Claim 8 (depends on 1) The method of claim 1, wherein the PRS comprises a PRS resource or an aggregate PRS spanning across multiple active bandwidth parts, wherein each of the multiple active bandwidth parts has a same maximum number of DL MIMO layers, wherein the PRS resource or the aggregate PRS spanning across multiple active bandwidth parts having different maximum number of DL MIMO layers is not received. ### Claim 9 (depends on 1) The method of claim 1, wherein the PRS configuration is received from a location server and the indication of the maximum number of DL MIMO layers is received from a serving base station. ### Claim 10 (depends on 9) The method of claim 9, wherein the serving base station reports to the location server the indication of the maximum number of DL MIMO layers of the UE. ### Claim 11 (depends on 9) The method of claim 9, further comprising transmitting a report to the location server with the number of antennas used to receive the PRS or the maximum number of DL MIMO layers configured to the UE. ### Claim 12 (depends on 11) The method of claim 11, wherein the report of the number of antennas used to receive the PRS or the maximum number of DL MIMO layers configured to the UE is included in a positioning measurement report transmitted to the location server. ### Claim 13 (depends on 12) The method of claim 12, wherein the number of antennas used to receive the PRS or the maximum number of DL MIMO layers reported to the location server comprises one of the number of antennas or the maximum number of DL MIMO layers per PRS resource, per PRS resource set, per frequency layer, per transmission reception point (TRP), or the number of antennas used to measure all PRS resources used in generating the positioning measurement report. ### Claim 14 A user equipment (UE) configured for positioning, comprising: a wireless transceiver configured for sending and receiving messages; at least one memory; and at least one processor coupled to the wireless transceiver and the at least one memory, the at least one processor configured to: receive, via the wireless transceiver, a positioning reference signal (PRS) configuration for receiving PRS; receive, via the wireless transceiver, an indication of a maximum number of downlink (DL) Multiple-Input Multiple-Output (MIMO) layers that will be used to transmit communication signals comprising control signals or data signals to the UE in each bandwidth part (BWP) in one or more bandwidth parts, wherein each bandwidth part comprises a set of frequency resources of a component carrier of a radio frequency (RF) spectrum band; and receive, via the wireless transceiver, a PRS in an active bandwidth part using a number of antennas based on the maximum number of DL MIMO layers in the active bandwidth part. ### Claim 15 (depends on 14) The UE of claim 14, wherein the number of antennas based on the maximum number of DL MIMO layers in the active bandwidth part comprises the number of antennas at least equal to the maximum number of DL MIMO layers in the active bandwidth part. ### Claim 16 (depends on 14) The UE of claim 14, wherein the at least one processor is further configured to adjust accuracy requirement for a PRS measurement based on the number of antennas used to receive the PRS based on the maximum number of DL MIMO layers in the active bandwidth part. ### Claim 17 (depends on 14) The UE of claim 14, wherein no measurement gaps are configured for the PRS received in the active bandwidth part; and wherein when measurement gaps are configured for receiving a second PRS, the at least one processor is configured to: receive, via the wireless transceiver, an indication of a cell specific maximum number of DL MIMO layers that will be used by a base station to transmit the communication signals to the UE; receive, via the wireless transceiver, the second PRS using a second number of antennas based on the cell specific maximum number of DL MIMO layers. ### Claim 18 (depends on 14) The UE of claim 14, wherein the PRS comprises a PRS resource or an aggregate PRS spanning across multiple active bandwidth parts, and the at least one processor is configured to receive the PRS in the active bandwidth part using the number of antennas based on the maximum number of DL MIMO layers in the active bandwidth part by being configured to receive the PRS resource or the aggregate PRS spanning across multiple active bandwidth parts using the number of antennas which is based on one of a minimum or a maximum number of antennas configured by the maximum number of DL MIMO layers in the multiple active bandwidth parts or using the number of antennas configured by a location server. ### Claim 19 (depends on 18) The UE of claim 18, wherein the aggregate PRS spanning across multiple active bandwidth parts comprises a collection of PRS resources or sets of PRS resources that the UE is expected to process jointly. ### Claim 20 (depends on 18) The UE of claim 18, wherein each active bandwidth part is in a different component carrier of the RF spectrum band. ### Claim 21 (depends on 14) The UE of claim 14, wherein the PRS comprises a PRS resource or an aggregate PRS spanning across multiple active bandwidth parts, wherein each of the multiple active bandwidth parts has a same maximum number of DL MIMO layers, wherein the PRS resource or the aggregate PRS spanning across multiple active bandwidth parts having different maximum number of DL MIMO layers is not received. ### Claim 22 (depends on 14) The UE of claim 14, wherein the PRS configuration is received from a location server and the indication of the maximum number of DL MIMO layers is received from a serving base station. ### Claim 23 (depends on 22) The UE of claim 22, wherein the serving base station reports to the location server the indication of the maximum number of DL MIMO layers of the UE. ### Claim 24 (depends on 22) The UE of claim 22, wherein the at least one processor is further configured to transmit a report to the location server with the number of antennas used to receive the PRS or the maximum number of DL MIMO layers configured to the UE. ### Claim 25 (depends on 24) The UE of claim 24, wherein the report of the number of antennas used to receive the PRS or the maximum number of DL MIMO layers configured to the UE is included in a positioning measurement report transmitted to the location server. ### Claim 26 (depends on 25) The UE of claim 25, wherein the number of antennas used to receive the PRS or the maximum number of DL MIMO layers reported to the location server comprises one of the number of antennas or a maximum number of DL MIMO layers per PRS resource, per PRS resource set, per frequency layer, per transmission reception point (TRP), or the number of antennas used to measure all PRS resources used in generating the positioning measurement report. ### Claim 27 A user equipment (UE) configured for positioning, comprising: means for receiving a positioning reference signal (PRS) configuration for receiving PRS; means for receiving an indication of a maximum number of downlink (DL) Multiple-Input Multiple-Output (MIMO) layers that will be used to transmit communication signals comprising control signals or data signals to the UE in each bandwidth part (BWP) in one or more bandwidth parts, wherein each bandwidth part comprises a set of frequency resources of a component carrier of a radio frequency (RF) spectrum band; and means for receiving a PRS in an active bandwidth part using a number of antennas based on the maximum number of DL MIMO layers in the active bandwidth part. ### Claim 28 (depends on 27) The UE of claim 27, wherein the number of antennas based on the maximum number of DL MIMO layers in the active bandwidth part comprises the number of antennas at least equal to the maximum number of DL MIMO layers in the active bandwidth part. ### Claim 29 (depends on 27) The UE of claim 27, further comprising means for adjusting accuracy requirement for a PRS measurement based on the number of antennas used to receive the PRS based on the maximum number of DL MIMO layers in the active bandwidth part. ### Claim 30 (depends on 27) The UE of claim 27, wherein no measurement gaps are configured for the PRS received in the active bandwidth part; and wherein when measurement gaps are configured for receiving a second PRS, the UE further comprises: means for receiving an indication of a cell specific maximum number of DL MIMO layers that will be used by a base station to transmit the communication signals to the UE; means for receiving the second PRS using a second number of antennas based on the cell specific maximum number of DL MIMO layers. ### Claim 31 (depends on 27) The UE of claim 27, wherein the PRS comprises a PRS resource or an aggregate PRS spanning across multiple active bandwidth parts, and receiving the PRS in the active bandwidth part using the number of antennas based on the maximum number of DL MIMO layers in the active bandwidth part comprises receiving the PRS resource or the aggregate PRS spanning across multiple active bandwidth parts using the number of antennas which is based on one of a minimum or a maximum number of antennas configured by the maximum number of DL MIMO layers in the multiple active bandwidth parts or using the number of antennas configured by a location server. ### Claim 32 (depends on 31) The UE of claim 31, wherein the aggregate PRS spanning across multiple active bandwidth parts comprises a collection of PRS resources or sets of PRS resources that the UE is expected to process jointly. ### Claim 33 (depends on 31) The UE of claim 31, wherein each active bandwidth part is in a different component carrier of the RF spectrum band. ### Claim 34 (depends on 27) The UE of claim 27, wherein the PRS comprises a PRS resource or an aggregate PRS spanning across multiple active bandwidth parts, wherein each of the multiple active bandwidth parts has a same maximum number of DL MIMO layers, wherein the PRS resource or the aggregate PRS spanning across multiple active bandwidth parts having different maximum number of DL MIMO layers is not received. ### Claim 35 (depends on 27) The UE of claim 27, wherein the PRS configuration is received from a location server and the indication of the maximum number of DL MIMO layers is received from a serving base station. ### Claim 36 (depends on 35) The UE of claim 35, wherein the serving base station reports to the location server the indication of the maximum number of DL MIMO layers of the UE. ### Claim 37 (depends on 35) The UE of claim 35, further comprising means for transmitting a report to the location server with the number of antennas used to receive the PRS or the maximum number of DL MIMO layers configured to the UE. ### Claim 38 (depends on 37) The UE of claim 37, wherein the report of the number of antennas used to receive the PRS or the maximum number of DL MIMO layers configured to the UE is included in a positioning measurement report transmitted to the location server. ### Claim 39 (depends on 38) The UE of claim 38, wherein the number of antennas used to receive the PRS or the maximum number of DL MIMO layers reported to the location server comprises one of the number of antennas or the maximum number of DL MIMO layers per PRS resource, per PRS resource set, per frequency layer, per transmission reception point (TRP), or the number of antennas used to measure all PRS resources used in generating the positioning measurement report. ### Claim 40 A non-transitory computer readable storage medium including program code stored thereon, the program code is operable to configure at least one processor in a user equipment (UE) configured for positioning, comprising: program code to receive a positioning reference signal (PRS) configuration for receiving PRS; program code to receive an indication of a maximum number of downlink (DL) Multiple-Input Multiple-Output (MIMO) layers that will be used to transmit communication signals comprising control signals or data signals to the UE in each bandwidth part (BWP) in one or more bandwidth parts, wherein each bandwidth part comprises a set of frequency resources of a component carrier of a radio frequency (RF) spectrum band; and program code to receive a PRS in an active bandwidth part using a number of antennas based on the maximum number of DL MIMO layers in the active bandwidth part.