# US 12,004,002 B2 · Handling service data application protocol (SDApP) end markers at handover > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,004,002 B2 - Document ID: US12004002B2 - Status: Granted - Kind: B2 - Application number: 17/289,556 - Filed: 2019-11-01 - Published: 2021-12-23 - Granted: 2024-06-04 - Earliest claimed: 2018-11-02 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget Lm Ericsson (Publ) - Inventors: Matteo Fiorani; Alexander Vesely - Web page: https://patentgrep.com/patent/US12004002B2 ## CPC - H04W 28/0263: {involving mapping traffic to individual bearers or channels, e.g. traffic flow template [TFT]} - H04W 36/0005: {Control or signalling for completing the hand-off} - 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 28/06: 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 28/10: Flow control {between communication endpoints} - H04W 36/0044: {of quality context information} - H04W 76/15: Setup of multiple wireless link connections - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Methods performed by base stations and wireless devices in networks are disclosed. A method performed by a base station comprises: initiating a QoS-flow to DRB remapping; informing a target base station that the remapping is ongoing; and providing the target base station an old and a new QoS-flow to DRB mapping, wherein the old mapping was in place before the remapping, and the new mapping will be in place after the remapping. Another method performed by a base station comprises: receiving an indication from a further base station that QoS-flow to DRB remapping is ongoing; receiving an old and a new QoS-flow to DRB mapping from the further base station; and receiving signals from a wireless device using the old and new QoS-flow to DRB mappings. A method performed by the wireless device comprises: sending data packets using a first QoS-flow to DRB mapping; receiving a new mapping; and sending an SOAR end marker, indicating that the wireless device is applying the new mapping. Also disclosed are base stations and wireless devices configured to perform the methods. ## Claims ### Claim 1 A method performed by a source base station, the method comprising: initiating a Quality of Service-flow (QoS-flow) to Data Resource Bearer (DRB) remapping; providing a target base station with one or more new QoS-flow to DRB mappings; and sending the target base station a Sequence Number (SN) status transfer message, the SN status transfer message comprising a list of DRBs subject to status transfer, the list of DRBs subject to the status transfer indicating one or more old QoS-flow to DRB mappings, wherein the list of DRBs subject to the status transfer includes a QoS flow mapping list that indicates one or more uplink (UL) QoS flows for which the source base station has initiated the QoS flow to DRB remapping and a Service Data Adaptation Protocol (SDAP) end marker has not been received at the source base station. ### Claim 2 (depends on 1) The method of claim 1, wherein the QoS-flow to DRB remapping is ongoing when a handover from the source base station to the target base station is triggered. ### Claim 3 (depends on 1) The method of claim 1, wherein the list of DRBs subject to the status transfer comprises a DRB Identity (DRB ID) and at least one of an Uplink (UL) count value and a Downlink (DL) count value. ### Claim 4 (depends on 1) The method of claim 1, wherein: the list of DRBs subject to the status transfer comprises a DRB Identity (DRB ID) and an Uplink (UL) count value associated with the DRB ID; and with respect to a DRB identified by the DRB ID, the target base station does not deliver any uplink packet having a Packet Data Convergence Protocol Sequence Number (PDCP-SN) lower than a value contained within the UL count value associated with the DRB ID. ### Claim 5 (depends on 1) The method of claim 1 wherein, when the source base station has accepted a request for uplink forwarding from the target base station in relation to a DRB, the SN status transfer message comprises a list of missing and received uplink Service Data Units (SDUs) for that DRB. ### Claim 6 (depends on 1) The method of claim 1, wherein the source base station is a node from which DRB context is transferred, and wherein the target base station is a node to which the DRB context is transferred in dual connectivity. ### Claim 7 (depends on 6) The method of claim 6, wherein the method is performed when the QoS-flow to DRB remapping is ongoing when the DRB context transfer is triggered. ### Claim 8 (depends on 1) The method of claim 1, wherein the one or more old QoS-flow to DRB mappings and the one or more new QoS-flow to DRB mappings enable the target base station to receive Service Data Adaptation Protocol (SDAP) headers from a wireless device. ### Claim 9 (depends on 1) The method of claim 1, wherein: the list of DRBs subject to the status transfer comprises a DRB Identity (DRB ID) and a Downlink (DL) count value associated with the DRB ID; and with respect to a DRB identified by the DRB ID, the target base station node uses a value of a Packet Data Convergence Protocol Sequence Number (PDCP-SN) from the DL count value for the first downlink packet for which no PDCP-SN has previously been assigned. ### Claim 10 (depends on 1) The method of claim 1, wherein the source base station is a source Next Generation Radio Access Network (NG-RAN) node and the target base station is a target NG-RAN node for handover. ### Claim 11 A source base station comprising: processing circuitry configured to perform the steps of: i. initiating a Quality of Service-flow (QoS-flow) to Data Radio Bearer (DRB) remapping; ii. providing a target base station with one or more new QoS-flow to DRB mappings; and iii. sending the target base station a Sequence Number (SN) status transfer message, the SN status transfer message comprising a list of DRBs subject to status transfer, the list of DRBs subject to the status transfer indicating one or more old QoS-flow to DRB mappings, wherein the list of DRBs subject to the status transfer includes a QoS flow mapping list that indicates one or more uplink (UL) QoS flows for which the source base station has initiated the QoS flow to DRB remapping and a Service Data Adaptation Protocol (SDAP) end marker has not been received at the source base station, power supply circuitry configured to supply power to the source base station.