# US 2018/0324641 A1 · Method and apparatus of transmitting data duplication in a 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 2018/0324641 A1 - Document ID: US20180324641A1 - Status: Published application - Kind: A1 - Application number: 15/969,707 - Filed: 2018-05-02 - Published: 2018-11-08 - Earliest claimed: 2017-05-05 - Assignees: ASUSTeK COMPUTER INC. - Applicants: ASUSTek Computer Inc. - Inventors: Hsin-Hsi Tsai; Li-Te Pan; Li-Chih Tseng - Web page: https://patentgrep.com/patent/US20180324641A1 ## CPC - H04W 28/065: {using assembly or disassembly of packets} - H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} - H04L 69/321: Interlayer communication protocols or service data unit [SDU] definitions; Interfaces between layers - H04L 69/322: Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions - H04W 72/04: Wireless resource allocation - H04W 36/0069: {in case of dual connectivity, e.g. decoupled uplink/downlink} - H04W 36/026: {Multicasting of data during hand-off} - H04W 76/15: Setup of multiple wireless link connections - H04W 76/34: Selective release of ongoing connections - H04W 80/02: Data link layer protocols - 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 Methods and apparatuses for transmitting data duplication in a wireless communication system are disclosed herein. In one method for a user equipment (UE) configured with data duplication. The UE duplicates a data unit into a first data unit and a second data unit. The UE constructs a second Radio Link Control (RLC) Packet Data Unit (PDU) used for transmitting the second data unit. The second data unit is a second RLC Service Data Unit (SDU). The UE receives a control command from a network node. The control command is used to deactivate the data duplication. The UE discards the second RLC PDU if the second RLC PDU includes the second RLC SDU. ## Claims ### Claim 1 A method of a user equipment (UE) configured with data duplication, the method comprising: duplicating a data unit into a first data unit and a second data unit; constructing a second Radio Link Control (RLC) Packet Data Unit (PDU) used for transmitting the second data unit, wherein the second data unit is a second RLC Service Data Unit (SDU); receiving a control command from a network node, wherein the control command is used to deactivate the data duplication; and discarding the second RLC PDU if the second RLC PDU includes the second RLC SDU. ### Claim 2 (depends on 1) The method of claim 1, further comprising: not discarding the second RLC PDU if the second RLC PDU includes only a segment of the second RLC SDU. ### Claim 3 (depends on 1) The method of claim 1, wherein the second RLC SDU is a complete RLC SDU. ### Claim 4 (depends on 2) The method of claim 2, wherein the segment of the second RLC SDU is not a complete RLC SDU. ### Claim 5 (depends on 2) The method of claim 2, wherein the first byte of the second RLC SDU is not included in the second RLC PDU. ### Claim 6 (depends on 1) The method of claim 1, further comprising: establishing a first logical channel and a second logical channel, wherein the first logical channel and the second logical channel are associated with a radio bearer; and establishing a first RLC entity and a second RLC entity, wherein the first RLC entity is associated with the first logical channel and the second RLC entity is associated with the second logical channel. ### Claim 7 (depends on 6) The method of claim 6, wherein the first RLC entity is a first Unacknowledged Mode (UM) RLC entity and the second RLC entity is a second UM RLC entity. ### Claim 8 (depends on 6) The method of claim 6, further comprising: using a first serving cell to serve the first logical channel; and using a second serving cell to serve the second logical channel. ### Claim 9 (depends on 1) The method of claim 1, further comprising: constructing a first RLC PDU used for transmitting the first data unit, wherein the first data unit is a first RLC SDU. ### Claim 10 (depends on 9) The method of claim 9, wherein the first RLC PDU is constructed in a first RLC entity. ### Claim 11 (depends on 1) The method of claim 1, wherein the second RLC PDU is an Unacknowledged Mode Data (UMD) PDU. ### Claim 12 (depends on 1) The method of claim 1, wherein the second RLC PDU is constructed in a second RLC entity. ### Claim 13 (depends on 1) The method of claim 1, wherein the data unit is a Packet Data Convergence Protocol (PDCP) PDU. ### Claim 14 (depends on 1) The method of claim 1, wherein the content of the first data unit is the same as the content of the second data unit. ### Claim 15 (depends on 1) The method of claim 1, wherein the control command is a Medium Access Control (MAC) control element. ### Claim 16 (depends on 1) The method of claim 1, wherein the control command is used to switch data duplication from an activated state to a deactivated state. ### Claim 17 (depends on 1) The method of claim 1, further comprising: not discarding the RLC SDU in a first RLC entity when the UE receives the control command from the network node. ### Claim 18 (depends on 1) The method of claim 1, further comprising: discarding RLC SDU(s) in a second RLC entity when the UE receives the control command from the network node. ### Claim 19 (depends on 1) The method of claim 1, wherein the data duplication is a mechanism that a Packet Data Convergence Protocol (PDCP) entity of the UE duplicates a PDCP PDU into a first PDCP PDU and a second PDCP PDU, delivers the first PDCP PDU to a first RLC entity, and delivers the second PDCP PDU to a second RLC entity. ### Claim 20 A UE configured with data duplication comprising: a control circuit; a processor installed in the control circuit; a memory installed in the control circuit and coupled to the processor; wherein the processor is configured to execute a program code stored in the memory to: duplicate a data unit into a first data unit and a second data unit; construct a second Radio Link Control (RLC) Packet Data Unit (PDU) used for transmitting the second data unit, wherein the second data unit is a second RLC Service Data Unit (SDU); receive a control command from a network node, wherein the control command is used to deactivate the data duplication; and discard the second RLC PDU if the second RLC PDU includes the second RLC SDU.