# US 12,114,327 B2 · Apparatus and method for semi-persistent scheduling and power control in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,114,327 B2 - Document ID: US12114327B2 - Status: Granted - Kind: B2 - Application number: 17/872,815 - Filed: 2022-07-25 - Published: 2022-11-10 - Granted: 2024-10-08 - Earliest claimed: 2017-03-24 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Feifei Sun; Jingxing Fu - Web page: https://patentgrep.com/patent/US12114327B2 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)} - H04L 1/1887: {Scheduling and prioritising arrangements} - H04L 1/1896: {ARQ related signaling} - H04L 5/0046: {Determination of the number of bits transmitted on different sub-channels} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 52/02: Power saving arrangements - H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range} - H04W 52/38: TPC being performed in particular situations - H04W 52/50: at the moment of starting communication in a multiple access environment - H04W 72/04: Wireless resource allocation - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - 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 A method performed by a user equipment (UE) is provided. The method includes receiving, from a base station, configuration information on a random access configuration for a narrowband including: information on an initial power of a random access preamble for an enhanced coverage level, and information associated with a power ramping for the enhanced coverage level, and performing a first random access preamble transmission corresponding to a first transmit power, wherein the first transmit power is set based on the information on the initial power of the random access preamble and the information associated with the power ramping in case that the UE is in the enhanced coverage level, and wherein the UE is a narrow band internet of things (NB-IoT) UE. ## Claims ### Claim 1 A method performed by a narrow band internet of things (NB-IoT) user equipment (UE), the method comprising: receiving, from a base station, a radio resource control (RRC) message including configuration information associated with a plurality of enhanced coverage levels, wherein the configuration information associated with the plurality of enhanced coverage levels includes: information on an initial power of a random access preamble for a first enhanced coverage level, information associated with a power ramping for the first enhanced coverage level, information on an initial power of a random access preamble for a second enhanced coverage level, and information associated with a power ramping for the second enhanced coverage level; identifying the UE belongs to the first enhanced coverage level based on a reference signal received power (RSRP); identifying a first transmit power, determined by the information on the initial power of the random access preamble for the first enhanced coverage level; performing a first random access preamble transmission based on the first transmit power; performing retransmissions using the information associated with the power ramping for the first enhanced coverage level, used for the first enhanced coverage level of the UE in case that a random access response corresponding to the first random access preamble transmission is not received; in case that the first random access preamble transmission is not successful by the retransmission, continue performing, by the UE, preamble transmission attempts based on the information associated with the power ramping for the first enhanced coverage level in case that a maximum number of preamble transmission attempt is not reached in the first enhanced coverage level; and in case that the maximum number of preamble transmission attempt is reached in the first enhanced coverage level, selecting a resource corresponding to a second enhanced coverage, used for a second random access preamble transmission, identifying a second transmit power, determined by the initial power of the random access preamble for the second enhanced coverage level, performing the second random access preamble transmission based on the second transmit power, and performing retransmissions using the information associated with the power ramping for the second enhanced coverage level, used for the second enhanced coverage level of the UE in case that a random access response corresponding to the second random access preamble transmission is not received, wherein the first enhanced coverage level is different from the second enhanced coverage level. ### Claim 2 (depends on 1) The method of claim 1, wherein the first enhance coverage level is an enhanced coverage level 0, and wherein the second enhanced coverage level is an enhanced coverage level 1. ### Claim 3 (depends on 1) The method of claim 1, wherein the first transmit power is determined based on a repetition number for the random access preamble. ### Claim 4 A method performed by a base station (BS), the method comprising: transmitting, to a narrow band internet of things (NB-IoT) user equipment (UE), a radio resource control (RRC) message including configuration information associated with a plurality of enhanced coverage levels, wherein the configuration information associated with the plurality of enhanced coverage levels includes: information on an initial power of a random access preamble for a first enhanced coverage level, information associated with a power ramping for the first enhanced coverage level, information on an initial power of a random access preamble for a second enhanced coverage level, and information associated with a power ramping for the second enhanced coverage level; receiving, from the UE, a first random access preamble transmitted based on a first transmit power, used for the first enhanced coverage level identified by the UE based on the configuration information; transmitting a random access response corresponding to the first random access preamble; and in response to transmitting the random access response, receiving, from the UE, a second random access preamble on a resource corresponding to a second enhanced coverage, used for a second random access preamble transmission, transmitted based on a second transmit power, in case that the random access response corresponding to the first random access preamble is not received by the UE and a maximum number of preamble transmission attempt is reached in the first enhanced coverage level, the second transmit power is used for the second enhanced coverage level identified by the UE based on the configuration information, wherein the first enhanced coverage level is different from the second enhanced coverage level. ### Claim 5 (depends on 4) The method of claim 4, wherein the first enhance coverage level is an enhanced coverage level 0, and wherein the second enhanced coverage level is an enhanced coverage level 1. ### Claim 6 (depends on 4) The method of claim 4, wherein the first transmit power is determined based on a repetition number for the random access preamble. ### Claim 7 A narrow band internet of things (NB-IoT) user equipment (UE), the UE comprising: a transceiver; and at least one processor coupled to the transceiver, wherein the at least one processor is configured to: receive, from a base station, a radio resource control (RRC) message including configuration information associated with a plurality of enhanced coverage levels, wherein the configuration information associated with the plurality of enhanced coverage levels includes: information on an initial power of a random access preamble for a first enhanced coverage level, information associated with a power ramping for the first enhanced coverage level, information on an initial power of a random access preamble for a second enhanced coverage level, and information associated with a power ramping for the second enhanced coverage level, identify the UE belongs to the first enhanced coverage level based on a reference signal received power (RSRP), identify a first transmit power, determined by the information on the initial power of the random access preamble for the first enhanced coverage level, perform a first random access preamble transmission based on the first transmit power, perform retransmissions using the information associated with the power ramping for the first enhanced coverage level, used for the first enhanced coverage level of the UE in case that a random access response corresponding to the first random access preamble transmission is not received, in case that the first random access preamble transmission is not successful by the retransmission, continue to perform preamble transmission attempts based on the information associated with the power ramping for the first enhanced coverage level in case that a maximum number of preamble transmission attempt is not reached in the first enhanced coverage level, and in case that the maximum number of preamble transmission attempt is reached in the first enhanced coverage level, select resource corresponding to a second enhanced coverage, used for a second random access preamble transmission, identify a second transmit power, determined by the initial power of the random access preamble for the second enhanced coverage level, perform the second random access preamble transmission based on the second transmit power, and perform retransmissions using the information associated with the power ramping for the second enhanced coverage level, used for the second enhanced coverage level of the UE in case that a random access response corresponding to the second random access preamble transmission is not received, wherein the first enhanced coverage level is different from the second enhanced coverage level. ### Claim 8 (depends on 7) The UE of claim 7, wherein the first enhance coverage level is an enhanced coverage level 0, and wherein the second enhanced coverage level is an enhanced coverage level 1. ### Claim 9 (depends on 7) The UE of claim 7, wherein the first transmit power is determined based on a repetition number for the random access preamble. ### Claim 10 A base station (BS), the BS comprising: a transceiver; and at least one processor coupled to the transceiver, wherein the at least one processor is configured to: transmit, to a narrow band internet of things (NB-IoT) user equipment (UE), a radio resource control (RRC) message including configuration information associated with a plurality of enhanced coverage levels, wherein the configuration information associated with the plurality of enhanced coverage levels includes: information on an initial power of a random access preamble for a first enhanced coverage level, information associated with a power ramping for the first enhanced coverage level, information on an initial power of a random access preamble for a second enhanced coverage level, and information associated with a power ramping for the second enhanced coverage level, receive, from the UE, a first random access preamble transmitted based on a first transmit power, used for the first enhanced coverage level identified by the UE based on the configuration information, and transmit a random access response corresponding to the first random access preamble, and in response to the transmission of the random access response, receive, from the UE, a second random access preamble on a resource corresponding to a second enhanced coverage, used for a second random access preamble transmission, transmitted based on a second transmit power, in case that the random access response corresponding to the first random access preamble is not received by the UE and a maximum number of preamble transmission attempt is reached in the first enhanced coverage level, the second transmit power is used for the second enhanced coverage level identified by the UE based on the configuration information, wherein the first enhanced coverage level is different from the second enhanced coverage level. ### Claim 11 (depends on 10) The BS of claim 10, wherein the first enhance coverage level is an enhanced coverage level 0, and wherein the second enhanced coverage level is an enhanced coverage level 1. ### Claim 12 (depends on 10) The BS of claim 10, wherein the first transmit power is determined based on a repetition number for the random access preamble.