# US 2024/0205774 A1 · Communication method and apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0205774 A1 - Document ID: US20240205774A1 - Status: Published application - Kind: A1 - Application number: 18/591,033 - Filed: 2024-02-29 - Published: 2024-06-20 - Earliest claimed: 2021-08-30 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Bin XU; Meiling TANG; Zhengfeng LI - Web page: https://patentgrep.com/patent/US20240205774A1 ## CPC - H04W 36/185: {using make before break} - H04W 36/0055: {Transmission or use of information for re-establishing the radio link} - H04W 36/00692: {using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO] (allocation of physical resources in CoMP or in CA H04L5/0035)} - H04W 36/08: Reselecting an access point - H04W 36/00695: {using split of the control plane or user plane} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Embodiments of this application provide a communication method and apparatus. The method includes: A source secondary node SN receives an address of a core network device from a source master node MN. The source SN establishes, based on the address of the core network device, a channel for data forwarding between the source SN and the core network device, where the channel for data forwarding is used for transmission of data of a terminal device. ## Claims ### Claim 1 A communication method, comprising: receiving, by a source master node (MN), an address of a core network device; sending, by the source MN to a source secondary node (SN), the address of the core network device; receiving, by the source SN, the address of the core network device from the source MN; and establishing, by the source SN based on the address of the core network device, a channel for data forwarding between the source SN and the core network device, wherein the channel for data forwarding is used for transmission of data of a terminal device. ### Claim 2 (depends on 1) The method according to claim 1, wherein the data of the terminal device comprises data sent by the terminal device to the core network device, or data sent by the core network device to the terminal device. ### Claim 3 (depends on 1) The method according to claim 1, wherein the address of the core network device is carried in a secondary base station release request message or a secondary base station release confirm message. ### Claim 4 (depends on 1) The method according to claim 1, wherein the address of the core network device sent by the source master MN is carried in a handover command from the source MN to the source SN. ### Claim 5 (depends on 1) The method according to claim 1, wherein the address of the core network device sent by the source MN is carried in a secondary base station release request message or a secondary base station release confirm message from the source MN to the source SN. ### Claim 6 (depends on 1) The method according to claim 1, further comprising: receiving, by the source SN, an address of a target MN from a source MN or a core network device; and establishing, by the source SN based on the address of the target MN, a channel for data forwarding between the source SN and the target MN. ### Claim 7 (depends on 1) The method according to claim 1, further comprising: receiving, by the source MN, an address of a target SN from a target MN; and sending, by the source MN, the address of the target SN to the source SN. ### Claim 8 (depends on 7) The method according to claim 7, wherein the address of the target SN is carried in a handover response message. ### Claim 9 (depends on 7) The method according to claim 7, wherein the address of the target SN is carried in a secondary base station release request message or a secondary base station release confirm message. ### Claim 10 A communication system, comprising: a source master node (MN) and a source secondary node (SN); wherein the source MN is configured to: receive an address of a core network device; send the address of the core network device; the source SN is configured to: receive the address of the core network device from the source MN; establish based on the address of the core network device, a channel for data forwarding between the source SN and the core network device, wherein the channel for data forwarding is used for transmission of data of a terminal device. ### Claim 11 (depends on 10) The system according to claim 10, wherein the data of the terminal device comprises data sent by the terminal device to the core network device, or data sent by the core network device to the terminal device. ### Claim 12 (depends on 10) The system according to claim 10, wherein the address of the core network device is carried in a secondary base station release request message or a secondary base station release confirm message. ### Claim 13 (depends on 10) The system according to claim 10, wherein the address of the core network device sent by the source master MN is carried in a handover command from the source MN to the source SN. ### Claim 14 (depends on 10) The system according to claim 10, wherein the address of the core network device sent by the source MN is carried in a secondary base station release request message or a secondary base station release confirm message from the source MN to the source SN. ### Claim 15 (depends on 10) The system according to claim 10, the source SN is further configured to: receive an address of a target MN from a source MN or a core network device; and establish based on the address of the target MN, a channel for data forwarding between the source SN and the target MN. ### Claim 16 (depends on 10) The system according to claim 10, the source MN is further configured to: receive an address of a target SN from a target MN; and send the address of the target SN to the source SN. ### Claim 17 (depends on 16) The system according to claim 16, wherein the address of the target SN is carried in a handover response message. ### Claim 18 (depends on 16) The system according to claim 16, wherein the address of the target SN is carried in a secondary base station release request message or a secondary base station release confirm message.