# US 2020/0404698 A1 · Method and apparatus for transmitting signals by tm rlc entity of transmission end 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 2020/0404698 A1 - Document ID: US20200404698A1 - Status: Published application - Kind: A1 - Application number: 16/970,123 - Filed: 2019-02-14 - Published: 2020-12-24 - Earliest claimed: 2018-04-03 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Seungjune Yi; Sunyoung Lee - Web page: https://patentgrep.com/patent/US20200404698A1 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 69/321: Interlayer communication protocols or service data unit [SDU] definitions; Interfaces between layers - H04L 69/324: in the data link layer [OSI layer 2], e.g. HDLC - H04W 72/1268: of uplink data flows - H04L 47/34: ensuring sequence integrity, e.g. using sequence numbers - H04W 8/04: Registration at HLR or HSS [Home Subscriber Server] - 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) ## Abstract The present invention relates to a method for transmitting signals by a MAC entity of a transmission end in a wireless communication system. In particular, the method includes the steps of: receiving, from an upper layer, information about sizes of SDUs stored in the upper layer, selecting at least one SDU of the SDUs by considering an uplink grant and the sizes of SDUs; transmitting information about the at least one selected SDU to the upper layer receiving the at least one selected SDU from the upper layer; generating a MAC PDU including the at least one selected SDU; and transmitting the MAC PDU to a reception end. ## Claims ### Claim 1 A method for transmitting signals by a Medium Access Control (MAC) entity of a transmission end in a wireless communication system, the method comprising: receiving, from an upper layer, information about sizes of service data units (SDUs) stored in the upper layer; selecting at least one SDU of the SDUs by considering an uplink grant and the sizes of SDUs; transmitting information about the at least one selected SDU to the upper layer; receiving the at least one selected SDU from the upper layer; generating a MAC protocol data unit (PDU) including the at least one selected SDU; and transmitting the MAC PDU to a reception end. ### Claim 2 (depends on 1) The method of claim 1, wherein the at least one selected SDU is received without adding a header and segmenting by the upper layer. ### Claim 3 (depends on 1) The method of claim 1, wherein, if a number of the at least one selected SDU is two or more, the at least one selected SDU is received from the upper layer in an order received at the upper layer from a Packet Data Convergence Protocol (PDCP) layer. ### Claim 4 A transmission end in a wireless communication system, the transmission end comprising: a memory; and at least one processor coupled to the memory and configured to control a Medium Access Control (MAC) entity of the transmission end to: receive, from an upper layer, information about sizes of service data units (SDUs) stored in the upper layer; select at least one SDU of the SDUs by considering an uplink grant and the sizes of SDUs; transmit information about the at least one selected SDU to the upper layer; receive the at least one selected SDU from the upper layer; generate a MAC protocol data unit (PDU) including the at least one selected SDU; and transmit the MAC PDU to a reception end. ### Claim 5 (depends on 4) The transmission end of claim 4, wherein the at least one selected SDU is received without adding a header and segmenting by the upper layer. ### Claim 6 (depends on 4) The transmission end of claim 4, wherein, if a number of the at least one selected SDU is two or more, the at least one selected SDU is received from the upper layer in an order received at the upper layer from a Packet Data Convergence Protocol (PDCP) layer. ### Claim 7 A method for transmitting signals by a Transparent Mode (TM) Radio Link Control (RLC) entity of a transmission end in a wireless communication system, the method comprising: receiving data units from a Packet Data Convergence Protocol (PDCP) layer; storing the data units in a buffer; transmitting, to a Medium Access Control (MAC) layer, information about sizes of the data units; receiving, from the MAC layer, information about at least one data unit among the data units; transmitting, to the MAC layer, the at least one data unit. ### Claim 8 (depends on 7) The method of claim 7, wherein, if a number of the at least one data unit is two or more, the at least one data unit is transmitted to the MAC layer in an order received from the PDCP layer. ### Claim 9 (depends on 7) The method of claim 7, wherein the at least one data unit is selected unit among the data units based on an uplink grant and the sizes of the data units by the MAC layer. ### Claim 10 (depends on 9) The method of claim 9, wherein the data units except for the selected at least one data unit are maintained in the buffer. ### Claim 11 A transmission end in a wireless communication system, the transmission end comprising: a memory; and at least one processor coupled to the memory and configured to control a Transparent Mode (TM) Radio Link Control (RLC) entity of the transmission end to: receive data units from a Packet Data Convergence Protocol (PDCP) layer; store the data units in the memory; transmit, to a Medium Access Control (MAC) layer, information about sizes of the data units; receive, from the MAC layer, information about at least one data unit among the data units; transmitting, to the MAC layer, the at least one data unit. ### Claim 12 (depends on 11) The transmission end of claim 11, wherein, if a number of the at least one data unit is two or more, the at least one data unit is transmitted to the MAC layer in an order received from the PDCP layer. ### Claim 13 (depends on 11) The transmission end of claim 11, wherein the at least one data unit is selected unit among the data units based on an uplink grant and the sizes of the data units by the MAC layer. ### Claim 14 (depends on 13) The transmission end of claim 13, wherein the data units except for the selected at least one data unit are maintained in the memory.