# US 11,445,448 B2 · Power control method for physical random access channel and terminal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,445,448 B2 - Document ID: US11445448B2 - Status: Granted - Kind: B2 - Application number: 17/153,442 - Filed: 2021-01-20 - Published: 2021-05-13 - Granted: 2022-09-13 - Earliest claimed: 2018-07-20 - Assignees: Vivo Mobile Communication Co., Ltd. - Applicants: Vivo Mobile Communication Co., Ltd. - Inventors: Xiaodong Sun; Peng Sun; Xueming Pan; Yu Yang - Web page: https://patentgrep.com/patent/US11445448B2 ## CPC - H04W 52/242: {taking into account path loss} - H04W 52/50: at the moment of starting communication in a multiple access environment - H04L 5/0057: {Physical resource allocation for CQI} - H04W 52/146: {Uplink power control} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 74/0838: using contention-free random access [CFRA] - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract This disclosure provides a power control method for a physical random access channel and a terminal. The method includes: calculating a path loss of a physical random access channel PRACH based on power information related to a synchronization broadcast signal block; and calculating transmit power of the PRACH based on the path loss. ## Claims ### Claim 1 A power control method for a physical random access channel, applied to a terminal and comprising: calculating a path loss of a physical random access channel (PRACH) based on power information related to a synchronization broadcast signal block; and calculating transmit power of the PRACH based on the path loss; wherein the step of calculating a path loss of a physical random access channel PRACH based on power information related to a synchronization broadcast signal block comprises; calculating the path loss of the PRACH based on transmit power of the synchronization broadcast signal block and a power offset between a channel state information reference signal (CSI-RS) and the synchronization broadcast signal block, wherein the power offset is configured by a network device. ### Claim 2 (depends on 1) The power control method for a physical random access channel according to claim 1, wherein the step of calculating the path loss of the PRACH based on transmit power of the synchronization broadcast signal block and a power offset between a channel state information reference signal CSI-RS and the synchronization broadcast signal block comprises: in a case in which the PRACH corresponds to at least one CSI-RS, or in a case in which the PRACH corresponds to at least one synchronization broadcast signal block and a target synchronization broadcast signal block exists in the at least one synchronization broadcast signal block, calculating the path loss based on transmit power of the synchronization broadcast signal block and a power offset between the CSI-RS and the synchronization broadcast signal block. ### Claim 3 (depends on 2) The power control method for a physical random access channel according to claim 2, wherein the step of calculating the path loss based on transmit power of the synchronization broadcast signal block and a power offset between the CSI-RS and the synchronization broadcast signal block comprises: in the case in which the PRACH corresponds to the at least one CSI-RS, calculating at least one third candidate path loss separately based on transmit power of the synchronization broadcast signal block and at least one power offset between the at least one CSI-RS and the synchronization broadcast signal block; and determining an average value, a maximum value, or a minimum value of the at least one third candidate path loss as the path loss. ### Claim 4 (depends on 2) The power control method for a physical random access channel according to claim 2, Wherein the step of calculating the path loss based on transmit power of the synchronization broadcast signal block and a power offset between the CSI-RS and the synchronization broadcast signal block comprises: in the case in which the PRACH corresponds to the at least one synchronization broadcast signal block and the target synchronization broadcast signal block exists in the at least one synchronization broadcast signal block, calculating at least one fourth candidate path loss separately based on transmit power of the target synchronization broadcast signal block and a power offset between the CSI-RS and the target synchronization broadcast signal block; and determining an average value, a maximum value, or a minimum value of the at least one fourth candidate path loss as the path loss. ### Claim 5 (depends on 1) The power control method for a physical random access channel according to claim 1, wherein the step of calculating the path loss of the PRACH based on transmit power of the synchronization broadcast signal block and a power offset between a channel state information reference signal CS I-RS and the synchronization broadcast signal block comprises: determining a sum of the transmit power of the synchronization broadcast signal block and the power offset as reference signal transmit power, or determining a difference between the transmit power of the synchronization broadcast signal block and the power offset as reference signal transmit power; and determining a difference between the reference signal transmit power and higher layer filtered reference signal received power as the path loss. ### Claim 6 (depends on 1) The power control method for a physical random access channel according to claim 1, wherein the PRACH is used for one of the following procedures: an initial access procedure; a link recovery procedure; a handover procedure; and a beam management procedure. ### Claim 7 A terminal, wherein the terminal comprises a processor, a memory, and a computer program stored in the memory and capable of running on the processor, and when the computer program is executed by the processor, steps of a power control method for a physical random access channel are implemented, the method comprising: calculating a path loss of a physical random access channel (PRACH) based on power information related to a synchronization broadcast signal block; and calculating transmit power of the MACH based on the path loss; wherein the step of calculating a path lass of a physical random access channel PRACH based on power information related to a synchronization broadcast signal block comprises; calculating the path loss of the PRACH based on transmit power of the synchronization broadcast signal block and a power offset between a channel state information reference signal (CSI-RS) and the synchronization broadcast signal block, wherein the power offset is configured by a network device. ### Claim 8 (depends on 7) The terminal according to claim 7, wherein the step of calculating the path loss of the PRACH based on transmit power of the synchronization broadcast signal block and a power offset between a channel state information reference signal CSI-RS and the synchronization broadcast signal block comprises: in a case in which the PRACH corresponds to at least one CSI-RS, or in a case in which the PRACH corresponds to at least one synchronization broadcast signal block and a target synchronization broadcast signal block exists in the at least one synchronization broadcast signal block, calculating the path loss based on transmit power of the synchronization broadcast signal block and a power offset between the CSI-RS and the synchronization broadcast signal block. ### Claim 9 (depends on 8) The terminal according to claim 8, wherein the step of calculating the path loss based on transmit power of the synchronization broadcast signal block and a power offset between the CSI-RS and the synchronization broadcast signal block comprises: in the case in which the PRACH corresponds to the at least one CSI-RS, calculating at least one third candidate path loss separately based on transmit power of the synchronization broadcast signal block and at least one power offset between the at least one CSI-RS and the synchronization broadcast signal block; and determining an average value, a maximum value, or a minimum value of the at least one third candidate path loss as the path loss. ### Claim 10 (depends on 8) The terminal according to claim 8, wherein the step of calculating the path loss based on transmit power of the synchronization broadcast signal block and a power offset between the CSI-RS and the synchronization broadcast signal block comprises: in the case in which the PRACH corresponds to the at least one synchronization broadcast signal block and the target synchronization broadcast signal block exists in the at least one synchronization broadcast signal block, calculating at least one fourth candidate path loss separately based on transmit power of the target synchronization broadcast signal block and a power offset between the CSI-RS and the target synchronization broadcast signal block; and determining an average value, a maximum value, or a minimum value of the at least one fourth candidate path loss as the path loss. ### Claim 11 (depends on 7) The terminal according to claim 7, wherein the step of calculating the path loss of the PRACH based on transmit power of the synchronization broadcast signal block and a power offset between a channel state information reference signal CSI-RS and the synchronization broadcast signal block comprises: determining a sum of the transmit power of the synchronization broadcast signal block and the power offset as reference signal transmit power, or determining a difference between the transmit power of the synchronization broadcast signal block and the power offset as reference signal transmit power; and determining a difference between the reference signal transmit power and higher layer filtered reference signal received power as the path loss. ### Claim 12 (depends on 7) The terminal according to claim 7, wherein the PRACH is used for one of the following procedures: an initial access procedure; a link recovery procedure; a handover procedure; and a beam management procedure. ### Claim 13 A non-transitory computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, steps of a power control method for a physical random access channel are implemented, the method comprising: calculating a path loss of a physical random access channel (PRACH) based on power information related to a synchronization broadcast signal block; and calculating transmit power of the PRACH based on the path loss; wherein the step of calculating a path loss of a physical random access channel PRACH based on power information related to a synchronization broadcast signal block comprises; calculating the path loss of the PRACH based on transmit power of the synchronization broadcast signal block and a power offset between a channel state information reference signal (SCI-RS) and the synchronization broadcast signal block, wherein the power offset is configured by a network device. ### Claim 14 (depends on 3) The non-transitory computer-readable storage medium according to claim 3, wherein the step of calculating the path loss of the PRACH based on transmit power of the synchronization broadcast signal block and a power offset between a channel state information reference signal CSI-RS and the synchronization broadcast signal block comprises: in a case in which the PRACH corresponds to at least one CSI-RS, or in a case in which the PRACH corresponds to at least one synchronization broadcast signal block and a target synchronization broadcast signal block exists in the at least one synchronization broadcast signal block, calculating the path loss based on transmit power of the synchronization broadcast signal block and a power offset between the CSI-RS and the synchronization broadcast signal block. ### Claim 15 (depends on 14) The non-transitory computer-readable storage medium according to claim 14, wherein the step of calculating the path loss based on transmit power of the synchronization broadcast signal block and a power offset between the CSI-RS and the synchronization broadcast signal block comprises: in the case in which the PRACH corresponds to the at least one CSI-RS, calculating at least one third candidate path loss separately based on transmit power of the synchronization broadcast signal block and at least one power offset between the at least one CSI-RS and the synchronization broadcast signal block; and determining an average value, a maximum value, or a minimum value of the at least one third candidate path loss as the path loss. ### Claim 16 (depends on 14) The non-transitory computer-readable storage medium according to claim 14, wherein the step of calculating the path loss based on transmit power of the synchronization broadcast signal block and a power offset between the CSI-RS and the synchronization broadcast signal block comprises: in the case in which the PRACH corresponds to the at least one synchronization broadcast signal block and the target synchronization broadcast signal block exists in the at least one synchronization broadcast signal block, calculating at least one fourth candidate path loss separately based on transmit power of the target synchronization broadcast signal block and a power offset between the CSI-RS and the target synchronization broadcast signal block; and determining an average value, a maximum value, or a minimum value of the at least one fourth candidate path loss as the path loss. ### Claim 17 (depends on 13) The non-transitory computer-readable storage medium according to claim 13, wherein the step of calculating the path loss of the PRACH based on transmit power of the synchronization broadcast signal block and a power offset between a channel state information reference signal CSI-RS and the synchronization broadcast signal block comprises; determining a sum of the transmit power of the synchronization broadcast signal block and the power offset as reference signal transmit power, or determining a difference between the transmit power of the synchronization broadcast signal block and the power offset as reference signal transmit power; and determining a difference between the reference signal transmit power and higher layer filtered reference signal received power as the path loss. ### Claim 18 (depends on 13) The non-transitory computer-readable storage medium according to claim 13, wherein the PRACH is used for one of the following procedures; an initial access procedure; a link recovery procedure; a handover procedure; and a beam management procedure.