# US 11,445,403 B2 · Method for processing data in consideration of TCP/IP > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,445,403 B2 - Document ID: US11445403B2 - Status: Granted - Kind: B2 - Application number: 16/499,837 - Filed: 2018-03-30 - Published: 2020-02-20 - Granted: 2022-09-13 - Earliest claimed: 2017-03-30 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Sangkyu Baek; Youngjoong Mok; Rayeon Ahn; Hyunjeong Kang - Web page: https://patentgrep.com/patent/US11445403B2 ## CPC - H04W 28/0273: {adapting protocols for flow control or congestion control to wireless environment, e.g. adapting transmission control protocol [TCP] (wireless network protocols or protocol adaptations to wireless operation, e.g. wireless application protocol H04W80/00)} - H04W 28/0252: {per individual bearer or channel (dynamic wireless traffic scheduling H04W72/12)} - H04W 28/0268: {using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] (negotiating SLA or negotiating QoS H04W28/24)} - H04W 28/04: Error control - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method for processing a packet by a transmission device in a wireless communication system according to an embodiment of the present invention comprises the steps of: checking whether a data radio bearer (DRB) mapped to a quality of service (QoS) flow changes from a first DRB to a second DRB; and when the DRB changes from the first DRB to the second DRB, transmitting, to a reception device, information on a last packet transmitted through the first DRB in the QoS flow. ## Claims ### Claim 1 A packet processing method of a transmitting device in a wireless communication system, the method comprising: identifying whether a data radio bearer (DRB) mapped to a quality of service (QoS) flow is changed from a legacy DRB to a new DRB; and transmitting, to a receiving device via the new DRB, information on a last packet transmitted from the transmitting device to the receiving device on the legacy DRB in the QoS flow, in case that the DRB is changed from the legacy DRB to the new DRB, wherein the information on the last packet transmitted from the transmitting device to the receiving device on the legacy DRB includes a sequence number of the last packet on the legacy DRB. ### Claim 2 (depends on 1) The method of claim 1, further comprising transmitting, to the receiving device, information on a legacy packet transmitted on the new DRB in the QoS flow. ### Claim 3 (depends on 1) The method of claim 1, further comprising: starting a timer; and transmitting, to the receiving device, a packet related to the QoS flow on the new DRB in case that the timer has expired. ### Claim 4 (depends on 1) The method of claim 1, further comprising receiving, from the receiving device, a message requesting for re-transmission of at least one packet transmitted on the legacy DRB. ### Claim 5 (depends on 1) The method of claim 1, further comprising: receiving, from the receiving device, an acknowledgement (ack) message corresponding to the last packet transmitted from the transmitting device to the receiving device; and transmitting, to the receiving device, a packet related to the QoS flow on the new DRB after receiving the ack message. ### Claim 6 A packet processing method of a receiving device in a wireless communication system, the method comprising: identifying whether a data radio bearer (DRB) mapped to a quality of service (QoS) flow is changed from a legacy DRB to a new DRB; and receiving, from a transmitting device via the new DRB, information on a last packet transmitted from the transmitting device to the receiving device on the legacy DRB in the QoS flow in case that the DRB is changed from the legacy DRB to the new DRB, wherein the information on the last packet transmitted from the transmitting device to the receiving device on the legacy DRB includes a sequence number of the last packet on the legacy DRB. ### Claim 7 (depends on 6) The method of claim 6, further comprising receiving, from the transmitting device, information on a legacy packet transmitted on the new DRB in the QoS flow. ### Claim 8 (depends on 6) The method of claim 6, further comprising receiving a packet related to the QoS flow on the new DRB from the transmitting device in case that a timer has expired in the transmitting device. ### Claim 9 (depends on 6) The method of claim 6, further comprising transmitting, to the transmitting device, a message requesting for re-transmission of at least one packet transmitted on the legacy DRB. ### Claim 10 (depends on 6) The method of claim 6, further comprising: transmitting, to the transmitting device, an acknowledgement (ack) message, to the transmitting device, corresponding to the last packet transmitted from the transmitting device to the receiving device; and receiving a packet related to the QoS flow from the transmitting device on the new DRB. ### Claim 11 A transmitting device for processing packets in a wireless communication system, the device comprising: a transceiver; and a controller connected to the transceiver and configured to control to: identify whether a data radio bearer (DRB) mapped to a quality of service (QoS) flow is changed from a legacy data radio bearer (DRB) to a new DRB; and transmit information, to a receiving device via the new DRB, on a last packet being transmitted from the transmitting device to the receiving device on the legacy DRB in the QoS flow in case that the DRB is changed from the legacy DRB to the new DRB, wherein the information on the last packet transmitted from the transmitting device to the receiving device on the legacy DRB includes a sequence number of the last packet on the legacy DRB. ### Claim 12 (depends on 11) The device of claim 11, wherein the controller is configured to control to transmit information on a legacy packet being transmitted on the new DRB to the receiving device in the QoS flow. ### Claim 13 (depends on 11) The device of claim 11, wherein the controller is configured to control to start a timer and transmit a packet related to the QoS flow to the receiving device on the new DRB in case that the timer has expired. ### Claim 14 A receiving device for processing packets in a wireless communication system, the device comprising: a transceiver; and a controller connected to the transceiver and configured to control to: identify whether a data radio bearer (DRB) mapped to a quality of service (QoS) flow is changed from a legacy DRB to a new DRB; and receive, from a transmitting device via the new DRB, information on a last packet being transmitted from the transmitting device to the receiving device on the legacy DRB in the QoS flow in case that the DRB is changed from the legacy DRB to the new DRB, wherein the information on the last packet transmitted from the transmitting device to the receiving device on the legacy DRB includes a sequence number of the last packet on the legacy DRB. ### Claim 15 (depends on 14) The device of claim 14, wherein the controller is configured to control to receive information on a legacy packet being transmitted on the new DRB in the QoS flow from the transmitting device.