# US 11,909,489 B2 · System and method for beam management with emissions limitations > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,489 B2 - Document ID: US11909489B2 - Status: Granted - Kind: B2 - Application number: 17/417,963 - Filed: 2019-04-29 - Published: 2022-02-10 - Granted: 2024-02-20 - Earliest claimed: 2019-01-04 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Bin Liu; Pengfei Xia; Young Hoon Kwon - Web page: https://patentgrep.com/patent/US11909489B2 ## CPC - H04B 7/0623: {Auxiliary parameters, e.g. power control [PCB] or not acknowledged commands [NACK], used as feedback information} - H04B 7/0696: {Determining beam pairs} - H04L 5/0025: {Spatial division following the spatial signature of the channel} - 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 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04W 16/28: using beam steering - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range} - H04B 7/088: {using beam selection} - 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 computer-implemented method for operating a user equipment (UE) includes measuring beamformed reference signals, selecting one or more beams in accordance with the measured beamformed reference signals, and determining, by the UE, that an uplink transmit power of the UE on a subset of the one or more beams is limited by emission criteria, and based thereon, transmitting, by the UE, a beam report indicating the one or more beams and an uplink transmit power limitation. ## Claims ### Claim 1 A method implemented by a user equipment (UE), the method comprising: measuring, by the UE, beamformed reference signals; selecting, by the UE, one or more beams in accordance with the measured beamformed reference signals; and determining, by the UE, that an uplink transmit power of the UE on a subset of the one or more beams is limited by emission criteria, and based thereon, transmitting, by the UE, a beam report indicating the one or more beams and an uplink transmit power limitation. ### Claim 2 (depends on 1) The method of claim 1, wherein the beamformed reference signals are measured during a beam management (BM) procedure. ### Claim 3 (depends on 1) The method of claim 1, wherein the beam report comprises a non-group-based report. ### Claim 4 (depends on 3) The method of claim 3, wherein an indicator of the uplink transmit power limitation indicates that the subset of the one or more beams are impacted by the emission criteria. ### Claim 5 (depends on 3) The method of claim 3, wherein the beam report further indicates a power backoff value subject to a maximum transmission power or a maximum transmit power of the UE subject to the emission criteria. ### Claim 6 (depends on 1) The method of claim 1, wherein the beam report comprises a group-based report. ### Claim 7 (depends on 6) The method of claim 6, further comprising grouping, by the UE, the subset of the one or more beams in accordance with the emission criteria. ### Claim 8 (depends on 6) The method of claim 6, wherein the beam report further indicates a power backoff value or a maximum uplink transmit power of the UE subject to the emission criteria. ### Claim 9 (depends on 1) The method of claim 1, wherein the beam report is transmitted in a channel state information (CSI) report. ### Claim 10 (depends on 1) The method of claim 1, wherein the beamformed reference signals comprise at least one of a channel state information reference signal (CSI-RS) or a synchronization signal block (SSB). ### Claim 11 (depends on 1) The method of claim 1, wherein the emission criteria comprises electromagnetic field emission criteria published by at least one of the International Commission and Non-Ionizing Radiation Protection (ICNIRP), the Federal Communication Commission (FCC), or the Institute of Electrical and Electronics Engineers (IEEE). ### Claim 12 A method implemented by an access node, the method comprising: transmitting, by the access node, beamformed reference signals; receiving, by the access node from a user equipment (UE), a beam report indicating one or more beams and an uplink transmit power limitation; and selecting, by the access node, one or more beam pair links (BPLs) from the one or more beams in accordance with the beam report. ### Claim 13 (depends on 12) The method of claim 12, wherein the beam report is received in a channel state information (CSI) report. ### Claim 14 (depends on 12) The method of claim 12, wherein the beamformed reference signals comprise at least one of a channel state information reference signal (CSI-RS) or a synchronization signal block (SSB). ### Claim 15 (depends on 12) The method of claim 12, wherein the beam report comprises a non-group-based report. ### Claim 16 (depends on 15) The method of claim 15, wherein an indicator of the uplink transmit power limitation indicates that a subset of the one or more beams are impacted by emission criteria or a power backoff value subject to a maximum transmission power. ### Claim 17 (depends on 12) The method of claim 12, wherein the beam report comprises a group-based report. ### Claim 18 (depends on 12) The method of claim 12, wherein selecting the one or more BPLs comprises selecting the one or more BPLs in accordance with an indicator of the one or more beams and an indicator of the uplink transmit power limitation. ### Claim 19 A user equipment (UE) comprising: a non-transitory memory storage comprising instructions; and one or more processors in communication with the non-transitory memory storage, wherein the one or more processors execute the instructions to: measure beamformed reference signals, select one or more beams in accordance with the measured beamformed reference signals, and determining, by the UE, that an uplink transmit power of the UE on a subset of the one or more beams is limited by emission criteria, and based thereon, transmitting, by the UE, a beam report indicating the one or more beams and an uplink transmit power limitation. ### Claim 20 (depends on 19) The UE of claim 19, wherein the beam report comprises a non-group-based report. ### Claim 21 (depends on 19) The UE of claim 19, wherein an indicator of the uplink transmit power limitation indicates that the subset of the one or more beams are impacted by the emission criteria. ### Claim 22 (depends on 21) The UE of claim 21, wherein the one or more processors further execute the instructions to determine that the uplink transmit power of the UE according to open loop power control is unachievable, and based thereon, determine that the uplink transmit power of the UE is limited to meet emission criteria. ### Claim 23 (depends on 19) The UE of claim 19, wherein the beam report comprises a group-based report. ### Claim 24 (depends on 19) The UE of claim 19, wherein the one or more processors further execute the instructions to group the one or more beams in accordance with the emission criteria. ### Claim 25 An access node comprising: a non-transitory memory storage comprising instructions; and one or more processors in communication with the non-transitory memory storage, wherein the one or more processors execute the instructions to: transmit beamformed reference signals, receive, from a user equipment (UE), a beam report indicating one or more beams and an uplink transmit power limitation, and select one or more beam pair links (BPLs) from the one or more beams in accordance with the beam report. ### Claim 26 (depends on 25) The access node of claim 25, wherein the beam report comprises a non-group-based report. ### Claim 27 (depends on 25) The access node of claim 25, wherein the beam report comprises a group-based report.