# US 2019/0357093 A1 · Method and apparatus for transmitting qos flow to drb mapping rule > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0357093 A1 - Document ID: US20190357093A1 - Status: Published application - Kind: A1 - Application number: 16/064,796 - Filed: 2018-01-05 - Published: 2019-11-21 - Earliest claimed: 2017-01-05 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Jian Xu; Daewook Byun; Seokjung Kim; Sunyoung Lee - Web page: https://patentgrep.com/patent/US20190357093A1 ## CPC - H04W 36/0044: {of quality context information} - H04W 36/0058: {Transmission of hand-off measurement information, e.g. measurement reports} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 36/22: for handling the traffic - H04W 36/30: by measured or perceived connection quality data - H04W 84/042: {Public Land Mobile systems, e.g. cellular systems} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Provided are a method in which a source base station (BS) transmits a Quality of Service (QoS) flow-to-data radio bearer (DRB) mapping rule to a target BS in a wireless communication system, and a device supporting the same. The method may include: receiving, from a user equipment (UE), a measurement result of a target cell; determining the handover of the UE to the target BS on the basis of the measurement result; and transmitting, to the target BS, a handover request message including a QoS flow-to-DRB mapping rule of the source BS. ## Claims ### Claim 1 A method for transmitting, by a source base station, a rule for Quality of Service (QoS) flow-to-data radio bearer (DRB) mapping to a target base station in a wireless communication system, the method comprising: receiving, from a user equipment (UE), a measurement result of a target cell; determining a handover of the UE to the target base station, based on the measurement result; and transmitting, to the target base station, a handover request message including the rule for QoS flow-to-DRB mapping of the source base station. ### Claim 2 (depends on 1) The method of claim 1, wherein the rule for QoS flow-to-DRB mapping is used for mapping certain QoS flow to certain DRB at the source base station. ### Claim 3 (depends on 1) The method of claim 1, wherein the rule for QoS flow-to-DRB mapping is used for mapping QoS flow to DRB at the target base station if the handover request message including the rule for QoS flow-to-DRB mapping is transmitted to the target base station. ### Claim 4 (depends on 1) The method of claim 1, further comprising: receiving, from the target base station, an indication which indicates whether or not the rule for QoS flow-to-DRB mapping included in the handover request message is used at the target base station. ### Claim 5 (depends on 4) The method of claim 4, further comprising: controlling data forwarding from the source base station to the target base station, based on the received indication. ### Claim 6 (depends on 4) The method of claim 4, wherein the handover to the target base station is determined, based on the received indication. ### Claim 7 (depends on 1) The method of claim 1, wherein the QoS flow includes a QoS profile. ### Claim 8 A method for transmitting, by a master base station, a rule for Quality of Service (QoS) flow-to-data radio bearer (DRB) mapping to a secondary base station in a wireless communication system, the method comprising: receiving, from a user equipment (UE), a measurement result of the secondary base station; determining a data offloading to the secondary base station, based on the measurement result; and transmitting, to the secondary base station, the rule for QoS flow-to-DRB mapping of the master base station. ### Claim 9 (depends on 8) The method of claim 8, wherein the rule for QoS flow-to-DRB mapping is used for mapping certain QoS flow to certain DRB at the master base station. ### Claim 10 (depends on 8) The method of claim 8, wherein the rule for QoS flow-to-DRB mapping is used for mapping QoS flow to DRB at the secondary base station if the rule for QoS flow-to-DRB mapping is transmitted to the secondary base station. ### Claim 11 (depends on 8) The method of claim 8, further comprising: receiving, from the secondary base station, an indication which indicates whether or not the rule for QoS flow-to-DRB mapping is used at the secondary base station. ### Claim 12 (depends on 11) The method of claim 11 further comprising: controlling data forwarding from the master base station to the secondary base station, based on the received indication. ### Claim 13 (depends on 11) The method of claim 11, wherein the data offloading to the secondary base station is determined, based on the received indication. ### Claim 14 (depends on 8) The method of claim 8, wherein the rule for QoS flow-to-DRB mapping is included in a secondary node addition request message or a secondary node modification request message. ### Claim 15 A source base station for transmitting a rule for Quality of Service (QoS) flow-to-data radio bearer (DRB) mapping to a target base station in a wireless communication system, the source base station comprising: a memory; a transceiver; and a processor, connected with the memory and the transceiver, that: controls the transceiver to receive, from a user equipment (UE), a measurement result of a target cell; determines a handover of the UE to the target base station, based on the measurement result; and controls the transceiver to transmit, to the target base station, a handover request message including the rule for QoS flow-to-DRB mapping of the source base station.