# US 2022/0286385 A1 · Communication device, communication system, communication method, and non-transitory computer readable medium storing communication program > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0286385 A1 - Document ID: US20220286385A1 - Status: Published application - Kind: A1 - Application number: 17/637,153 - Filed: 2019-12-26 - Published: 2022-09-08 - Earliest claimed: 2019-12-26 - Assignees: NEC Corporation - Applicants: NEC Corporation - Inventors: Go FUJIMOTO - Web page: https://patentgrep.com/patent/US20220286385A1 ## CPC - H04L 45/24: Multipath - H04L 12/4633: {Interconnection of networks using encapsulation techniques, e.g. tunneling} - H04L 45/22: {Alternate routing} - H04L 45/66: {Layer 2 routing, e.g. in Ethernet based MAN's} - H04W 28/086: among access entities - H04W 40/02: Communication route or path selection, e.g. power-based or shortest path routing - H04W 80/02: Data link layer protocols - H04W 84/12: WLAN [Wireless Local Area Networks] - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - 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 device (10) includes a wireless LAN interface (11) that wirelessly communicates with an access point (31), a wireless LAN interface (12) that wirelessly communicates with an access point (32), an encapsulation unit (13) that encapsulates, in accordance with a specified encapsulation protocol, a transmission frame to be transmitted to a communication device (20) at the other side via Layer 2 tunneling, and a redundancy unit (14) that generates a first encapsulated frame where a MAC address of the wireless LAN interface (11) is set to a source MAC address and a second encapsulated frame where a MAC address of the wireless LAN interface (12) is set to a source MAC address by using the encapsulated transmission frame. ## Claims ### Claim 1 A communication device comprising: a first wireless LAN interface configured to wirelessly communicate with a first wireless LAN access point; a second wireless LAN interface configured to wirelessly communicate with a second wireless LAN access point; an encapsulation unit configured to encapsulate, in accordance with a specified encapsulation protocol, a transmission frame to be transmitted to a communication device at other side via Layer 2 tunneling; and a redundancy unit configured to generate a first encapsulated frame where a MAC address of the first wireless LAN interface is set to a source MAC address and a second encapsulated frame where a MAC address of the second wireless LAN interface is set to a source MAC address by using the encapsulated transmission frame, wherein the first wireless LAN interface wirelessly transmits the generated first encapsulated frame to the first wireless LAN access point, and the second wireless LAN interface wirelessly transmits the generated second encapsulated frame to the second wireless LAN access point. ### Claim 2 (depends on 1) The communication device according to claim 1, wherein the redundancy unit sets, to a destination MAC address of the first encapsulated frame, a MAC address of a wired LAN interface of the communication device at other side to which the first wireless LAN access point is connected, and sets, to a destination MAC address of the second encapsulated frame, a MAC address of a wired LAN interface of the communication device at other side to which the second wireless LAN access point is connected. ### Claim 3 (depends on 1) The communication device according to claim 1, wherein the redundancy unit sets, to a destination IP address of the first encapsulated frame, an IP address of a wired LAN interface of the communication device at other side to which the first or second wireless LAN access point is connected, and sets, to a destination IP address of the second encapsulated frame, an IP address of a wired LAN interface of the communication device at other side to which the first or second wireless LAN access point is connected. ### Claim 4 (depends on 1) The communication device according to claim 1, wherein the encapsulation unit assigns a sequence number to an encapsulation header when it is encapsulating the transmission frame. ### Claim 5 (depends on 1) The communication device according to claim 1, wherein the redundancy unit generates the first and second encapsulated frames according to a priority of the transmission frame. ### Claim 6 (depends on 1) The communication device according to claim 1, wherein the redundancy unit generates the first and second encapsulated frames according to quality of wireless communication with the first wireless LAN access point or quality of wireless communication with the second wireless LAN access point. ### Claim 7 (depends on 1) The communication device according to claim 1, wherein a wireless channel to be used or wireless transmission timing of the first wireless LAN interface differs from that of the second wireless LAN interface. ### Claim 8 A communication system comprising: first and second communication devices; and first and second wireless LAN access points connected to the second communication device, wherein the first communication device includes: a first wireless LAN interface configured to wirelessly communicate with the first wireless LAN access point; a second wireless LAN interface configured to wirelessly communicate with the second wireless LAN access point; an encapsulation unit configured to encapsulate, in accordance with a specified encapsulation protocol, a transmission frame to be transmitted to the second communication device via Layer 2 tunneling; and a redundancy unit configured to generate a first encapsulated frame where a MAC address of the first wireless LAN interface is set to a source MAC address and a second encapsulated frame where a MAC address of the second wireless LAN interface is set to a source MAC address by using the encapsulated transmission frame, the first wireless LAN interface wirelessly transmits the generated first encapsulated frame to the first wireless LAN access point, and the second wireless LAN interface wirelessly transmits the generated second encapsulated frame to the second wireless LAN access point. ### Claim 9 A communication method comprising: encapsulating, in accordance with a specified encapsulation protocol, a transmission frame to be transmitted to a communication device at other side via Layer 2 tunneling; generating a first encapsulated frame where a MAC address of a first wireless LAN interface is set to a source MAC address and a second encapsulated frame where a MAC address of a second wireless LAN interface is set to a source MAC address by using the encapsulated transmission frame, the first wireless LAN interface being configured to wirelessly communicate with a first wireless LAN access point, and the second wireless LAN interface being configured to wirelessly communicate with a second wireless LAN access point; wirelessly transmitting the generated first encapsulated frame from the first wireless LAN interface to the first wireless LAN access point; and wirelessly transmitting the generated second encapsulated frame from the second wireless LAN interface to the second wireless LAN access point. ### Claim 10 A non-transitory computer readable medium storing a communication program causing a computer to execute a process comprising: encapsulating, in accordance with a specified encapsulation protocol, a transmission frame to be transmitted to a communication device at other side via Layer 2 tunneling; generating a first encapsulated frame where a MAC address of a first wireless LAN interface is set to a source MAC address and a second encapsulated frame where a MAC address of a second wireless LAN interface is set to a source MAC address by using the encapsulated transmission frame, the first wireless LAN interface being configured to wirelessly communicate with a first wireless LAN access point, and the second wireless LAN interface being configured to wirelessly communicate with a second wireless LAN access point; wirelessly transmitting the generated first encapsulated frame from the first wireless LAN interface to the first wireless LAN access point; and wirelessly transmitting the generated second encapsulated frame from the second wireless LAN interface to the second wireless LAN access point. ### Claim 11 (depends on 8) The communication system according to claim 8, wherein the redundancy unit sets, to a destination MAC address of the first encapsulated frame, a MAC address of a wired LAN interface of the second communication device to which the first wireless LAN access point is connected, and sets, to a destination MAC address of the second encapsulated frame, a MAC address of a wired LAN interface of the second communication device to which the second wireless LAN access point is connected. ### Claim 12 (depends on 9) The communication method according to claim 9, wherein a MAC address of a wired LAN interface of the communication device at other side to which the first wireless LAN access point is connected is set to a destination MAC address of the first encapsulated frame, and a MAC address of a wired LAN interface of the communication device at other side to which the second wireless LAN access point is connected is set to a destination MAC address of the second encapsulated frame. ### Claim 13 (depends on 10) The non-transitory computer readable medium according to claim 10, wherein a MAC address of a wired LAN interface of the communication device at other side to which the first wireless LAN access point is connected is set to a destination MAC address of the first encapsulated frame, and a MAC address of a wired LAN interface of the communication device at other side to which the second wireless LAN access point is connected is set to a destination MAC address of the second encapsulated frame. ### Claim 14 A communication device comprising: a receiving unit configured to receive a first encapsulated frame from a communication device at other side through a first wireless LAN access point connected by wire and receive a second encapsulated frame from the communication device at other side through a second wireless LAN access point connected by wire; a redundancy unit configured to select any one of the first encapsulated frame and the second encapsulated frame; and a decapsulation unit configured to decapsulate the selected encapsulated frame in accordance with a specified encapsulation protocol.