# US 12,010,726 B2 · Method and apparatus for performing communication 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 12,010,726 B2 - Document ID: US12010726B2 - Status: Granted - Kind: B2 - Application number: 17/310,088 - Filed: 2020-01-16 - Published: 2022-03-03 - Granted: 2024-06-11 - Earliest claimed: 2019-01-17 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Min Wu; Feifei Sun; Bin Yu; Qi Xiong; Chen Qian - Web page: https://patentgrep.com/patent/US12010726B2 ## CPC - H04W 74/002: {Transmission of channel access control information} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)} - H04L 1/189: {Transmission or retransmission of more than one copy of a message} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04W 48/12: using downlink control channel - H04W 72/1268: of uplink data flows - H04W 74/0836: with 2-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 Embodiments of the present application provides an apparatus and a method for transmitting and receiving uplink data, and relates to the field of communication technologies. The method includes: performing uplink data transmission via a contention-based random access (RACH) procedure. The embodiments of the present application implement that, when transmitting uplink data in an RRC idle mode, the user equipment does not need to establish an RRC connection, and may directly transmit the uplink data via the RACH procedure, so that the power consumption of the UE may be reduced, and the waste of system resources may be reduced. ## Claims ### Claim 1 A method performed by a user equipment (UE) in a wireless communication system, the method comprising: in case that a size of uplink data to be transmitted is less than or equal to a threshold value and a set of random access (RA) resources for early data transmission (EDT) is configured, transmitting to a base station, a message A including the uplink data, in a 2-step RA procedure; and receiving, from the base station, a message B including a UE contention resolution identifier (ID) and a physical uplink control channel (PUCCH) resource indicator for an acknowledgement (ACK) for the message B, wherein the set of RA resources for the EDT is different from a set of RA resources for non-EDT. ### Claim 2 (depends on 1) The method of claim 1, wherein, the message A is transmitted without transitioning to a radio resource control (RRC) active state. ### Claim 3 (depends on 1) The method of claim 1, further comprising: in response to the message B, transmitting, to the base station, the ACK on a PUCCH resource identified based on the PUCCH resource indicator. ### Claim 4 (depends on 1) The method of claim 1, wherein the UE contention resolution ID matches UE contention resolution ID related information included in the message A. ### Claim 5 (depends on 1) The method of claim 1, further comprising: monitoring the message B. ### Claim 6 (depends on 1) The method of claim 1, wherein the UE contention resolution ID is indicated by a medium access control (MAC) random access response (RAR) included in the message B. ### Claim 7 A user equipment (UE) in a wireless communication system, the UE comprising: a transceiver; and at least one processor coupled with the transceiver and configured to: in case that a size of uplink data to be transmitted is less than or equal to a threshold value and a set of random access (RA) resources for early data transmission (EDT) is configured, transmit, to a base station via the transceiver, a message A including the uplink data, in a 2-step RA procedure; and receiving, from the bases station via the transceiver, a message B including a UE contention resolution identifier (ID) and a physical uplink control channel (PUCCH) resource indicator for an acknowledgement (ACK) for the message B, wherein the set of RA resources for the EDT is different from a set of RA resources for non-EDT. ### Claim 8 A method performed by a base station in a wireless communication system, the method comprising: in case that a size of uplink data to be transmitted is less than or equal to a threshold value and a set of random access (RA) resources for early data transmission (EDT) is configured, receiving, from a user equipment (UE) a message A including the uplink data, in a 2-step RA procedure; and transmitting, to the UE, a message B including a UE contention resolution identifier (ID) and a physical uplink control channel (PUCCH) resource indicator for an acknowledgement (ACK) for the message B, wherein the set of RA resources for the EDT is different from a set of RA resources for non-EDT. ### Claim 9 (depends on 8) The method of claim 8, wherein the message A is transmitted without transitioning to a radio resource control (RRC) active state. ### Claim 10 (depends on 8) The method of claim 8, further comprising: in response to the message B, receiving, from the UE, the ACK on a PUCCH resource identified based on the PUCCH resource indicator. ### Claim 11 (depends on 8) The method of claim 8, wherein the UE contention resolution ID matches UE contention resolution ID related information included in the message A. ### Claim 12 (depends on 8) The method of claim 8, wherein the UE contention resolution ID is indicated by a medium access control (MAC) random access response (RAR) included in the message B. ### Claim 13 A base station in a wireless communication system, the base station comprising: a transceiver; and at least one processor coupled with the transceiver and configured to: in case that a size of uplink data to be transmitted is less than or equal to a threshold value and a set of random access (RA) resources for early data transmission (EDT) is configured, receive, from a user equipment (UE) via the transceiver, a message A including the uplink data, in a 2-step RA procedure; and transmit, to the UE via the transceiver, a message B including a UE contention resolution identifier (ID) and a physical uplink control channel (PUCCH) resource indicator for an acknowledgement (ACK) for the message B, wherein the set of RA resources for the EDT is different from a set of RA resources for non-EDT.