# US 12,010,672 B2 · Common pathloss reference signal for spatial domain multiplexing sharing a common antenna panel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,010,672 B2 - Document ID: US12010672B2 - Status: Granted - Kind: B2 - Application number: 18/311,322 - Filed: 2023-05-03 - Published: 2023-08-24 - Granted: 2024-06-11 - Earliest claimed: 2021-03-11 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Shay Landis; Ran Berliner; Yehonatan Dallal - Web page: https://patentgrep.com/patent/US12010672B2 ## CPC - H04W 52/242: {taking into account path loss} - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04B 7/086: {using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming} - 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 5/0094: {Indication of how sub-channels of the path are allocated} - H04W 52/10: Open loop power control - H04W 52/146: {Uplink power control} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Wireless communications systems and methods related to reducing the signaling overhead for configuring a common reference signal used in performing coarse power control of multiple spatial domain multiplexing (SDM) uplink streams are provided. A base station may be in communication with a UE via multiple SDM streams directed from the same panel of the respective device. The base station may configure a common pathloss reference signal for the SDM streams of the same panel for the UE. This may include sending a list of possible pathloss reference signal configurations to the UE, and then identifying which configuration to use for the pathloss reference signal for the group of SDM streams. Once known, the UE may measure the reference signal for open loop power control. The BS may occasionally reconfigure the common reference signal for the grouped SDM streams. ## Claims ### Claim 1 A method of wireless communication comprising: determining, by a first wireless communications device, a single reference signal for a plurality of spatial domain multiplexing (SDM) uplink streams associated with respective different beam directions; transmitting, by the first wireless communications device to a second wireless communications device, a message comprising configuration information indicating the single reference signal; and transmitting, by the first wireless communications device to the second wireless communications device, the single reference signal. ### Claim 2 (depends on 1) The method of claim 1, wherein the plurality of SDM uplink streams are between a panel of the first wireless communications device and a panel of the second wireless communications device. ### Claim 3 (depends on 1) The method of claim 1, further comprising: transmitting, by the first wireless communications device to the second wireless communications device, a first message comprising a list of possible reference signals for the plurality of SDM uplink streams, the message comprising a second message and the configuration information comprising an indication of the single reference signal from among the list of reference signals. ### Claim 4 (depends on 1) The method of claim 1, wherein the message comprises a first message, the method further comprising: transmitting, by the first wireless communications device to the second wireless communications device, a second message identifying the plurality of SDM uplink streams as part of a first group. ### Claim 5 (depends on 1) The method of claim 1, wherein the message comprises a first message, the method further comprising: receiving, by the first wireless communications device from the second wireless communications device, a second message comprising configuration information indicating a different reference signal for the plurality of SDM uplink streams. ### Claim 6 (depends on 5) The method of claim 5, wherein the single reference signal comprises a synchronization signal block (SSB), and the different reference signal comprises a channel state information reference signal (CSI-RS), the method further comprising: changing the single reference signal used as the single reference signal for the plurality of SDM uplink streams to the different reference signal. ### Claim 7 (depends on 5) The method of claim 5, wherein the second message is sent in response to a change in a characteristic of a channel associated with one of the plurality of SDM uplink streams. ### Claim 8 (depends on 1) The method of claim 1, wherein the applying comprises: performing a coarse power adjustment to the plurality of SDM uplink streams. ### Claim 9 A first wireless communications device comprising: a processor configured to determine a single reference signal for a plurality of spatial domain multiplexing (SDM) uplink streams associated with respective different beam directions; and a transceiver configured to: transmit, to a second wireless communications device, a message comprising configuration information indicating the single reference signal; and transmit, to the second wireless communications device, the single reference signal. ### Claim 10 (depends on 9) The first wireless communications device of claim 9, wherein the plurality of SDM uplink streams are between a panel of the first wireless communications device and a panel of the second wireless communications device. ### Claim 11 (depends on 9) The first wireless communications device of claim 9, the transceiver further configured to: transmit, to the second wireless communications device, a first message comprising a list of possible reference signals for the plurality of SDM uplink streams, the message comprising a second message and the configuration information comprising an indication of the single reference signal from among the list of reference signals. ### Claim 12 (depends on 9) The first wireless communications device of claim 9, wherein the message comprises a first message, the transceiver further configured to: transmit, to the second wireless communications device, a second message identifying the plurality of SDM uplink streams as part of a first group. ### Claim 13 (depends on 9) The first wireless communications device of claim 9, wherein the message comprises a first message, the transceiver further configured to: receive, from the second wireless communications device, a second message comprising configuration information indicating a different reference signal for the plurality of SDM uplink streams. ### Claim 14 (depends on 13) The first wireless communications device of claim 13, wherein the single reference signal comprises a synchronization signal block (SSB), and the different reference signal comprises a channel state information reference signal (CSI-RS), the processor further configured to: change the single reference signal used as the single reference signal for the plurality of SDM uplink streams to the different reference signal. ### Claim 15 (depends on 13) The first wireless communications device of claim 13, wherein the second message is sent in response to a change in a characteristic of a channel associated with one of the plurality of SDM uplink streams. ### Claim 16 (depends on 9) The first wireless communications device of claim 9, wherein the applying comprises: performing a coarse power adjustment to the plurality of SDM uplink streams. ### Claim 17 An apparatus for use in a first wireless communications device, the apparatus comprising: means for determining a single reference signal for a plurality of spatial domain multiplexing (SDM) uplink streams; means for initiating transmission, to a second wireless communications device, a message comprising configuration information indicating the single reference signal; and means for initiating transmission, to the second wireless communications device, the single reference signal. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein the plurality of SDM uplink streams are between a panel of the first wireless communications device and a panel of the second wireless communications device. ### Claim 19 (depends on 17) The apparatus of claim 17, further comprising: means for initiating transmission, to the second wireless communications device, a first message comprising a list of possible reference signals for the plurality of SDM uplink streams, the message comprising a second message and the configuration information comprising an indication of the single reference signal from among the list of reference signals. ### Claim 20 (depends on 17) The apparatus of claim 17, wherein the message comprises a first message, and the apparatus further comprises: means for initiating transmission, to the second wireless communications device, a second message identifying the plurality of SDM uplink streams as part of a first group.