# US 11,910,244 B2 · Method and apparatus for controlling disorder of downlink data > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,910,244 B2 - Document ID: US11910244B2 - Status: Granted - Kind: B2 - Application number: 17/318,814 - Filed: 2021-05-12 - Published: 2021-08-26 - Granted: 2024-02-20 - Earliest claimed: 2018-11-14 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Yongcui Li; Fang Yu; Yan Li; Hui Ni; Yizhuang Wu - Web page: https://patentgrep.com/patent/US11910244B2 ## CPC - H04W 36/12: Reselecting a serving backbone network switching or routing node - H04W 36/0011: {for data sessions of end-to-end connection} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract This application provides a method for controlling disorder of downlink data and an apparatus thereof. The method includes: A control plane network element determines to switch from a first user plane device to a second user plane device, and sends indication information to the second user plane device. The second user plane device buffers, according to the received indication information, downlink data received from a session anchor, and sends the buffered downlink data after reception of an end marker from the first user plane device. ## Claims ### Claim 1 A method for controlling disorder of downlink data, wherein the method comprises: receiving, by a second user plane device, indication information from a control plane device, wherein a transmission path before switching passes through a data network, a session anchor, and a first user plane device, and a transmission path after switching passes through the data network, the session anchor, and the second user plane device; receiving, by the second user plane device, downlink data from the session anchor; buffering, by the second user plane device according to the indication information, the downlink data received from the session anchor; and sending, by the second user plane device, the buffered downlink data to a radio access network device after reception, by the second user plane device, of an end marker from the first user plane device; wherein there is a connection between the first user plane device and the second user plane device through which the end marker is passed from the first user plane device to the second user plane device. ### Claim 2 (depends on 1) The method according to claim 1, wherein the indication information indicates to the second user plane device to send the downlink data received from the session anchor after sending of downlink data from the first user plane device is completed. ### Claim 3 (depends on 1) The method according to claim 1, wherein the indication information indicates to the second user plane device to send the downlink data received from the session anchor after reception of the end marker from the first user plane device. ### Claim 4 (depends on 1) The method according to claim 1, wherein the method is applied in a user plane connection activation procedure. ### Claim 5 A method for controlling disorder of downlink data, wherein the method comprises: determining, by a control plane device, to switch from a first user plane device to a second user plane device; and sending, by the control plane device, indication information to the second user plane device, wherein the indication information indicates to the second user plane device to buffer downlink data received from a session anchor, wherein a transmission path, before the switch from the first user plane device to the second user plane device, passes through a data network, the session anchor, and the first user plane device, a transmission path after the switch passes through the data network, the session anchor, and the second user plane device, and there is a connection between the first user plane device and the second user plane device, and wherein the indication information indicates to the second user plane device to send the downlink data from the session anchor after reception, by the second user plane device, of an end marker from the first user plane device via the connection. ### Claim 6 (depends on 5) The method according to claim 5, wherein the indication information indicates to the second user plane device to send the downlink data from the session anchor after sending of downlink data from the first user plane device is completed. ### Claim 7 (depends on 5) The method according to claim 5, wherein the determining step comprises: determining, by the control plane device in a user plane connection activation procedure, to switch from the first user plane device to the second user plane device. ### Claim 8 An apparatus configured to operate as a user plane device, comprising: an interface; a processor; and a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions, which when executed by the processor cause the apparatus to implement a method of: receiving indication information from a control plane device, wherein a transmission path before switching passes through a data network, a session anchor, and a first user plane device, and a transmission path after switching passes through the data network, the session anchor, and the apparatus; receiving downlink data from the session anchor; buffering, according to the indication information, the downlink data received from the session anchor; and sending the buffered downlink data after reception, by the apparatus, of an end marker from the first user plane device, wherein there is a connection between the first user plane device and the apparatus through which the end marker is passed from the first user plane device to the apparatus. ### Claim 9 (depends on 8) The apparatus according to claim 8, wherein the indication information indicates to the apparatus to send the downlink data from the session anchor after sending of downlink data from the first user plane device is completed. ### Claim 10 (depends on 8) The apparatus according to claim 8, wherein the indication information indicates to the apparatus to send the downlink data from the session anchor after reception of the end marker from the first user plane device. ### Claim 11 (depends on 8) The apparatus according to claim 8, wherein the apparatus receives the indication information in a user plane connection activation procedure. ### Claim 12 An apparatus, comprising: an interface; a processor; and a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions, which when executed by the processor cause the apparatus to implement a method of: determining to switch from a first user plane device to a second user plane device; and sending indication information to the second user plane device, wherein the indication information indicates to the second user plane device to buffer downlink data from a session anchor, wherein a transmission path, before the switch from the first user plane device to the second user plane device, passes through a data network, the session anchor, and the first user plane device, a transmission path after the switch passes through the data network, the session anchor, and the second user plane device, and there is a connection between the first user plane device and the second user plane device, and wherein the indication information indicates to the second user plane device to send the downlink data from the session anchor after reception, by the second user plane device, of an end marker from the first user plane device via the connection. ### Claim 13 (depends on 12) The apparatus according to claim 12, wherein the indication information indicates to the second user plane device to send the downlink data from the session anchor after sending of downlink data from the first user plane device is completed. ### Claim 14 (depends on 12) The apparatus according to claim 12, wherein the apparatus determines, in a user plane connection activation procedure, to switch from the first user plane device to the second user plane device.