# US 10,873,990 B2 · Method and device for receiving and processing data of radio link control layer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,990 B2 - Document ID: US10873990B2 - Status: Granted - Kind: B2 - Application number: 16/354,930 - Filed: 2019-03-15 - Published: 2019-07-11 - Granted: 2020-12-22 - Earliest claimed: 2017-05-19 - Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Inventors: Hai Tang - Web page: https://patentgrep.com/patent/US10873990B2 ## CPC - H04W 80/02: Data link layer protocols - H04L 1/1621: {Group acknowledgement, i.e. the acknowledgement message defining a range of identifiers, e.g. of sequence numbers} - H04L 1/1841: {Resequencing} - H04L 1/1848: {Time-out mechanisms} - H04L 47/34: ensuring sequence integrity, e.g. using sequence numbers - H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} - H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) - H04W 76/10: Connection setup - 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 application provides a method and a device for receiving and processing data of a radio link control (RLC) layer, where the method includes: receiving a RLC protocol data unit (PDU); when a data field of the target RLC PDU merely comprises a segment of a complete RLC service data unit (SDU), processing the target RLC PDU or discarding the RLC PDU according to a current operating state of a re-assembly timer corresponding to a value of a sequence number (SN) comprised in the target RLC PDU, where the target RLC PDU is one of a plurality of RLC PDUs, the plurality of RLC PDUs has SNs of a same value, and the plurality of RLC PDUs is capable of being re-assembled into the complete RLC SDU, and the current operating state is one of the following operating states: non-activated state, counting state and expired state. ## Claims ### Claim 1 A method for receiving and processing data of a radio link control layer, comprising: receiving a target radio link control (RLC) protocol data unit (PDU); and when a data field of the target RLC PDU merely comprises a segment of a complete RLC service data unit (SDU), processing the target RLC PDU or discarding the target RLC PDU according to a current operating state of a re-assembly timer corresponding to a value of a sequence number (SN) comprised in the target RLC PDU, wherein the target RLC PDU is one of a plurality of RLC PDUs, the plurality of RLC PDUs has SNs of a same value, and the plurality of RLC PDUs is capable of being re-assembled into the complete RLC SDU, and the current operating state of the re-assembly timer is counting state; wherein the processing of the target RLC PDU according to the current operating state of the re-assembly timer corresponding to the value of the SN comprised in the target RLC PDU comprises: when it is determined that other RLC PDU, except for the target RLC PDU, among the plurality of RLC PDUs have been received before the target RLC PDU is received, re-assembling the plurality of RLC PDUs and ending the re-assembly timer, when it is determined that merely part of RLC PDU, except for the target RLC PDU, among the plurality of RLC PDUs have been received before the target RLC PDU is received, determining whether the re-assembly timer is expired, and when it is determined that the re-assembly timer is expired, discarding a RLC PDU that has been received before the re-assembly timer get expired among the plurality of RLC PDUs, wherein the RLC PDU that has been received comprises the target RLC PDU. ### Claim 2 (depends on 1) The method according to claim 1, wherein the method further comprises: when the data field of the target RLC PDU merely comprises the complete RLC SDU, re-assembling the target RLC PDU, wherein the target RLC PDU does not comprise a SN. ### Claim 3 (depends on 1) The method according to claim 1, wherein the method further comprises: determining the re-assembly timer according to the value of the SN comprised in the target RLC PDU. ### Claim 4 (depends on 1) The method according to claim 1, wherein before the processing the target RLC PDU according to the current operating state of the re-assembly timer corresponding to the value of the sequence number SN comprised in the target RLC PDU, the method further comprises: storing the target RLC PDU in a buffer. ### Claim 5 (depends on 4) The method according to claim 4, wherein before storing the target RLC PDU in the buffer, the method further comprises: determining that the target RLC PDU is received for the first time. ### Claim 6 A device, comprising a processor, a transceiver and a memory, wherein: the transceiver is configured to receive a target radio link control (RLC) protocol data unit (PDU); and the memory has executable instructions stored thereon that when executed by the processor cause the processor to: when a data field of the target RLC PDU merely comprises a segment of a complete RLC service data unit (SDU), process the target RLC PDU or discard the target RLC PDU according to a current operating state of a re-assembly timer corresponding to a value of a sequence number (SN) comprised in the target RLC PDU, wherein the target RLC PDU is one of a plurality of RLC PDUs, the plurality of RLC PDUs has SNs of a same value, and the plurality of RLC PDUs is capable of being re-assembled into the complete RLC SDU, and the current operating state of the re-assembly timer is counting state; wherein the memory further has executable instructions stored thereon that when executed by the processor cause the processor to: when it is determined that other RLC PDU, except for the target RLC PDU, among the plurality of RLC PDUs have been received by the transceiver before the target RLC PDU is received, re-assemble the plurality of RLC PDUs and end the re-assembly timer, when it is determined that merely part of RLC PDU, except for the target RLC PDU, among the plurality of RLC PDUs have been received before the target RLC PDU is received by the transceiver, determine whether the re-assembly timer is expired, and when it is determined that the re-assembly timer is expired, discard a RLC PDU that has been received before the re-assembly timer get expired among the plurality of RLC PDUs, wherein the RLC PDU that has been received comprises the target RLC PDU. ### Claim 7 (depends on 6) The device according to claim 6, wherein the memory further has executable instructions stored thereon that when executed by the processor cause the processor to: when it is determined that the data field of the target RLC PDU merely comprises the complete RLC SDU, re-assemble the target RLC PDU, wherein the target RLC PDU does not comprise a SN. ### Claim 8 (depends on 6) The device according to claim 6, wherein the memory further has executable instructions stored thereon that when executed by the processor cause the processor to: determine the re-assembly timer according to the value of the SN comprised in the target RLC PDU. ### Claim 9 (depends on 6) The device according to claim 6, wherein the memory further has executable instructions stored thereon that when executed by the processor cause the processor to: before processing the target RLC PDU according to the current operating state of the re-assembly timer corresponding to the value of the sequence number SN comprised in the target RLC PDU, store the target RLC PDU in a buffer. ### Claim 10 (depends on 9) The device according to claim 9, wherein the memory further has executable instructions stored thereon that when executed by the processor cause the processor to: before storing the target RLC PDU in the buffer, determine that the target RLC PDU is received for the first time.