# US 11,909,461 B2 · Information transmission method and communication apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,461 B2 - Document ID: US11909461B2 - Status: Granted - Kind: B2 - Application number: 17/389,861 - Filed: 2021-07-30 - Published: 2021-11-18 - Granted: 2024-02-20 - Earliest claimed: 2019-02-02 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Bo Wang; Chaoyi Yan; Zezhou Luo - Web page: https://patentgrep.com/patent/US11909461B2 ## CPC - H04B 3/52: Systems for transmission between fixed stations via waveguides - H04W 4/42: for mass transport vehicles, e.g. buses, trains or aircraft - H04W 80/02: Data link layer protocols - H04W 92/20: between access points - H04W 36/0009: {for a plurality of users or terminals, e.g. group communication or moving wireless networks (user group management H04W4/08; processing of subscriber group data H04W8/186)} - H04W 84/005: {Moving wireless networks} - H04W 84/042: {Public Land Mobile systems, e.g. cellular systems} - H04W 88/085: {Access point devices with remote components} - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A communication apparatus acting as a baseband unit (BBU) or being applicable to a BBU, and having instructions for obtaining first coordination information to be sent to a second BBU, determining, based on preset link information, a transmission link corresponding to the second BBU, the transmission link including a first remote radio unit (RRU) and a second RRU, the first RRU belonging to the BBU, the second RRU belonging to the second BBU, and the first RRU and the second RRU being connected through a wired link, sending the first coordination information to the first RRU, sending indication information to the first RRU, the indication information indicating to the first RRU to send the first coordination information to the second RRU through the wired link, the indication information having an identifier of the second RRU. ## Claims ### Claim 1 A communication apparatus, comprising: at least one processor, and one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor, the programming instructions including instructions for acting as a first baseband unit (BBU) or an apparatus applicable in the first BBU, and including instructions for: obtaining first coordination information to be sent to a second BBU; determining, based on preset link information, a transmission link corresponding to the second BBU, wherein the transmission link comprises a first remote radio unit (RRU) and a second RRU, wherein the first RRU belongs to the first BBU, wherein the second RRU belongs to the second BBU, and wherein the first RRU and the second RRU are connected through a wired link; sending the first coordination information to the first RRU; and sending indication information to the first RRU, wherein the indication information indicates to the first RRU to send the first coordination information to the second RRU through the wired link, wherein the indication information comprises an identifier of the second RRU. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein the programming instructions further include instructions for: receiving second coordination information from the first RRU, wherein the second coordination information is information sent from the second BBU to the first BBU through the transmission link. ### Claim 3 (depends on 1) The apparatus according to claim 1, wherein the wired link is a fiber link based on at least one of a common public radio interface (CPRI) or an ethernet common public radio interface (eCPRI). ### Claim 4 (depends on 1) The apparatus according to claim 1, wherein the first RRU is a bridging RRU for the first BBU, and wherein the second RRU is a bridging RRU for the second BBU. ### Claim 5 (depends on 4) The apparatus according to claim 4, wherein the first BBU determines, according to link information identifying the first RRU as the bridging RRU for the first BBU and further identifying the second RRU as the bridging RRU for the second BBU, the transmission link to be a transmission link corresponding to the second BBU is a bridging RRU for the first BBU, and wherein the second RRU is a bridging RRU for the second BBU. ### Claim 6 (depends on 5) The apparatus according to claim 5, wherein the first BBU maintains the link information. ### Claim 7 (depends on 1) The apparatus according to claim 1, wherein the first coordination information is information needed to be sent by the first BBU to the second BBU to coordinate completion of a data transmission process. ### Claim 8 A communication apparatus, comprising: at least one processor, and one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor, the programming instructions including instructions for acting as a first remote radio unit (RRU) or an apparatus applicable in the first RRU, and including instructions for: receiving first coordination information from a first baseband unit (BBU), wherein the first coordination information is information from the first BBU to a second BBU; receiving indication information from the first BBU, wherein the indication information indicates to the first RRU to send the first coordination information to a second RRU through a wired link, wherein the indication information comprises an identifier of the second RRU; and sending the first coordination information to the second RRU through the wired link between the first RRU and the second RRU according to the indication information, wherein the first RRU belongs to the first BBU, wherein the second RRU belongs to the second BBU, and wherein the first RRU is connected to the second RRU through the wired link. ### Claim 9 (depends on 8) The apparatus according to claim 8, wherein the programming instructions further include instructions for: receiving, over the wired link, second coordination information sent by the second RRU, wherein the second coordination information is information sent from the second BBU to the first BBU; and sending the second coordination information to the first BBU. ### Claim 10 (depends on 8) The apparatus according to claim 8, wherein the wired link is a fiber link based on at least one of a common public radio interface (CPRI) or an ethernet common public radio interface (eCPRI). ### Claim 11 (depends on 8) The apparatus according to claim 8, wherein the first RRU is a bridging RRU for the first BBU, and wherein the second RRU is a bridging RRU for the second BBU. ### Claim 12 (depends on 8) The apparatus according to claim 8, wherein the wired link is a link other than an X2 link. ### Claim 13 (depends on 8) The apparatus according to claim 8, wherein the first coordination information is information needed to be sent by the first BBU to the second BBU to coordinate completion of a data transmission process. ### Claim 14 A communication system, comprising: a first remote radio unit (RRU); and a first baseband unit (BBU), comprising: at least one processor; and one or more memories storing first programming instructions executable by the at least one processor, the first programming instructions including first instructions for: obtaining first coordination information to be sent to a second BBU; determining, based on preset link information, a transmission link corresponding to the second BBU, wherein the transmission link comprises the first RRU and a second RRU, wherein the first RRU belongs to the first BBU, wherein the second RRU belongs to the second BBU, and wherein the first RRU and the second RRU are connected through a wired link; sending the first coordination information to the first RRU; and sending indication information to the first RRU, wherein the indication information indicates to the first RRU to send the first coordination information to the second RRU through the wired link, and wherein the indication information comprises an identifier of the second RRU; wherein the first RRU comprises: at least one processor; and one or more memories storing second programming instructions executable by the at least one processor, the second programming instructions including second instructions for: sending the first coordination information to a second RRU through the wired link between the first RRU and the second RRU according to the indication information. ### Claim 15 (depends on 14) The communication system according to claim 14, wherein the first programming instructions further includes first instructions for: receiving, over the wired link, second coordination information from the second RRU, wherein the second coordination information is information from the second BBU to the first BBU; and sending the second coordination information to the first BBU. ### Claim 16 (depends on 14) The communication system according to claim 14, wherein the first RRU is a bridging RRU for the first BBU, and wherein the second RRU is a bridging RRU for the second BBU. ### Claim 17 (depends on 16) The communication system according to claim 16, wherein the first BBU determines, according to link information identifying the first RRU as the bridging RRU for the first BBU and further identifying the second RRU as the bridging RRU for the second BBU, the transmission link to be a transmission link corresponding to the second BBU is a bridging RRU for the first BBU, and wherein the second RRU is a bridging RRU for the second BBU. ### Claim 18 (depends on 17) The communication system according to claim 17, wherein the first BBU maintains the link information. ### Claim 19 (depends on 14) The communication system according to claim 14, wherein the first coordination information is information needed to be sent by the first BBU to the second BBU to coordinate completion of a data transmission process. ### Claim 20 (depends on 14) The communication system according to claim 14, wherein the wired link is a link other than an X2 link.