# US 2020/0288408 A1 · Message transmission method and device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0288408 A1 - Document ID: US20200288408A1 - Status: Published application - Kind: A1 - Application number: 16/875,226 - Filed: 2020-05-15 - Published: 2020-09-10 - Earliest claimed: 2017-11-17 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Yuwan SU; Tong JI; Zhe JIN; Weiliang ZHANG - Web page: https://patentgrep.com/patent/US20200288408A1 ## CPC - H04W 52/146: {Uplink power control} - H04B 17/328: {Reference signal received power [RSRP]; Reference signal received quality [RSRQ]} - H04W 52/242: {taking into account path loss} - H04W 52/325: {Power control of control or pilot channels} - H04W 52/36: with a discrete range or set of values, e.g. step size, ramping or offsets - H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range} - H04W 52/48: during retransmission after error or non-acknowledgment - H04W 52/50: at the moment of starting communication in a multiple access environment - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION ## Abstract A message transmission method and a device are used to accelerate a random access procedure. The method includes: receiving, by a terminal device, a repetition quantity of an uplink message from a network device, in response to determining that a reference signal receive power (RSRP) range of the terminal device is within an RSRP range corresponding to a signal coverage enhancement level 0, wherein the uplink message comprises a third message of a sequence of messages comprised in a random access attempt; calculating, by the terminal device, transmit power based on a power control parameter for the repetition quantity; and sending, by the terminal device, the uplink message to the network device based on the calculated transmit power. ## Claims ### Claim 1 A message transmission method, comprising: receiving, by a terminal device, a repetition quantity of an uplink message from a network device, in response to determining that a reference signal receive power (RSRP) range of the terminal device is within an RSRP range corresponding to a signal coverage enhancement level 0, wherein the uplink message comprises a third message of a sequence of messages comprised in a random access attempt; calculating, by the terminal device, transmit power based on a power control parameter for the repetition quantity; and sending, by the terminal device, the uplink message to the network device based on the calculated transmit power. ### Claim 2 (depends on 1) The method according to claim 1, the method further comprising: receiving, by the terminal device, first signaling and second signaling from the network device for performing a random access attempt, wherein the first signaling corresponds to the terminal device of a first version, and the second signaling corresponds to the terminal device of a second version newer than the first version; and initiating, by the terminal device, the random access attempt based on the second signaling, wherein the first signaling indicates at least one of a total quantity of maximum random access attempts, a maximum quantity of random access attempts at the signal coverage enhancement level 0, a maximum quantity of random access attempts at a signal coverage enhancement level 1, or a maximum quantity of random access attempts at a signal coverage enhancement level 2; and the second signaling indicates at least one of a total quantity of maximum random access attempts, or a maximum quantity of random access attempts at the signal coverage enhancement level 0. ### Claim 3 (depends on 1) The method according to claim 1, wherein the power control parameter comprises at least one of: a maximum transmit power of the terminal device, a target preamble received power, a downlink path loss, a preamble initial received target power, a power offset, a preamble attempt quantity, a power ramping step, a quantity of preamble sending repetitions, a power offset of the third message relative to a preamble, a path loss conversion proportionality coefficient, or a transmission bandwidth parameter. ### Claim 4 (depends on 1) The method according to claim 1, wherein the transmit power is calculated based on at least one of: a maximum transmit power of the terminal device, a target preamble received power, a downlink path loss, a power offset of the third message relative to a preamble, a path loss conversion proportionality coefficient, or a transmission bandwidth parameter. ### Claim 5 A message transmission method, comprising: sending, by a network device, first indication signaling to a terminal device, wherein the first indication signaling indicates a repetition quantity of an uplink message, and the uplink message comprises a third message of a sequence of messages comprised in a random access attempt; and receiving, by the network device, the uplink message sent by the terminal device according to a transmit power based on a power control parameter for the repetition quantity, in response to determining that a reference signal receive power (RSRP) range of the terminal device is within an RSRP range corresponding to a signal coverage enhancement level 0. ### Claim 6 (depends on 5) The method according to claim 5, wherein the method further comprises: sending, by the network device, first signaling and second signaling for performing a random access attempt, wherein the first signaling corresponds to the terminal device of a first version, and the second signaling corresponds to the terminal device of a second version newer than the first version; wherein the first signaling indicates at least one of a total quantity of maximum random access attempts, a maximum quantity of random access attempts at a signal coverage enhancement level 0, a maximum quantity of random access attempts at the signal coverage enhancement level 1, or a maximum quantity of random access attempts at the signal coverage enhancement level 2; and the second signaling indicates at least one of a total quantity of maximum random access attempts, or a maximum quantity of random access attempts at the signal coverage enhancement level 0. ### Claim 7 (depends on 5) The method according to claim 5, wherein the method further comprises: determining, by the network device, the power control parameter, wherein the power control parameter comprises at least one of: a maximum transmit power of the terminal device, a target preamble received power, a downlink path loss, a preamble initial received target power, a power offset, a preamble attempt quantity, a power ramping step, a quantity of preamble sending repetitions, a power offset of the third message relative to a preamble, a path loss conversion proportionality coefficient, or a transmission bandwidth parameter; and sending, by the network device, second indication signaling to the terminal device, wherein the second indication signaling indicates the power control parameter. ### Claim 8 A communications device, comprising: a transceiver, configured to: receive a repetition quantity of an uplink message from a network device, in response to determining that a reference signal receive power (RSRP) range of a terminal device is within an RSRP range corresponding to a signal coverage enhancement level 0, wherein the uplink message comprises a third message of a sequence of messages comprised in a random access attempt; at least one processor, and a non-transitory computer-readable storage medium coupled to the at least one processor and storing programming instructions for execution by the at least one processor, the programming instructions instruct the at least one processor to calculate transmit power based on a power control parameter for the repetition quantity; and the transceiver is further configured to send the uplink message to the network device based on the calculated transmit power. ### Claim 9 (depends on 8) The communications device according to claim 8, wherein the communications device is a communications device of a second version; the transceiver is further configured to receive first signaling and second signaling from the network device for performing a random access attempt, wherein the first signaling corresponds to the communications device of a first version, and the second signaling corresponds to the communications device of a second version newer than the first version; and the programming instructions further instruct the at least one processor to initiate the random access attempt based on the second signaling, wherein the first signaling indicates at least one of a total quantity of maximum random access attempts, a maximum quantity of random access attempts at a signal coverage enhancement level 0, a maximum quantity of random access attempts at the signal coverage enhancement level 1, or a maximum quantity of random access attempts at a signal coverage enhancement level 2; and the second signaling indicates at least one of a total quantity of maximum random access attempts, or a maximum quantity of random access attempts at the signal coverage enhancement level 0. ### Claim 10 (depends on 8) The communications device according to claim 8, wherein the power control parameter comprises at least one of: a maximum transmit power of the communications device, target preamble received power, a downlink path loss, a preamble initial received target power, a power offset, a preamble attempt quantity, a power ramping step, a quantity of preamble sending repetitions, a power offset of the third message relative to a preamble, a path loss conversion proportionality coefficient, or a transmission bandwidth parameter. ### Claim 11 (depends on 8) The communications device according to claim 8, wherein the programming instructions further instruct the at least one processor to: calculate the transmit power according to at least one of a maximum transmit power of the terminal device, a target preamble received power, a downlink path loss, a power offset of the third message relative to a preamble, a path loss conversion proportionality coefficient, or a transmission bandwidth parameter. ### Claim 12 A network device: a transceiver, configured to: send first indication signaling to a communications device, wherein the first indication signaling indicates a repetition quantity of an uplink message, and the first uplink message comprises a third message of a sequence of messages comprised in a random access attempt; and receive the uplink message sent by a terminal device according to a transmit power based on a power control parameter for the repetition quantity, in response to determining that a reference signal receive power (RSRP) range of the terminal device is within an RSRP range corresponding to a signal coverage enhancement level 0. ### Claim 13 (depends on 12) The network device according to claim 12, wherein the transceiver is further configured to send first signaling and second signaling for performing a random access attempt, wherein the first signaling corresponds to the terminal device of a first version, and the second signaling corresponds to the terminal device of a second version newer than the first version; the first signaling indicates at least one of a total quantity of maximum random access attempts, a maximum quantity of random access attempts at a signal coverage enhancement level 0, a maximum quantity of random access attempts at the signal coverage enhancement level 1, or a maximum quantity of random access attempts at the signal coverage enhancement level 2; and the second signaling indicates at least one of a total quantity of maximum random access attempts, or a maximum quantity of random access attempts at the signal coverage enhancement level 0. ### Claim 14 (depends on 12) The network device according to claim 12, wherein the network device further comprises at least one processor, and a non-transitory computer-readable storage medium coupled to the at least one processor and storing programming instructions for execution by the at least one processor, the programming instructions instruct the at least one processor to; determine the power control parameter, wherein the power control parameter comprises at least one of: a maximum transmit power of the communications device, target preamble received power, a downlink path loss, preamble initial received target power, a power offset, a preamble attempt quantity, a power ramping step, a quantity of preamble sending repetitions, a power offset of the third message relative to a preamble, a path loss conversion proportionality coefficient, or a transmission bandwidth parameter; and the transceiver is further configured to send second indication signaling to the communications device, wherein the second indication signaling indicates the power control parameter.