# US 2019/0246331 A1 · Management apparatus, communication system, and method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0246331 A1 - Document ID: US20190246331A1 - Status: Published application - Kind: A1 - Application number: 16/317,331 - Filed: 2017-07-11 - Published: 2019-08-08 - Earliest claimed: 2016-07-14 - Assignees: NEC Corporation - Applicants: NEC Corporation - Inventors: Hiroaki NAKAJIMA - Web page: https://patentgrep.com/patent/US20190246331A1 ## CPC - H04L 45/28: using route fault recovery - H04W 40/02: Communication route or path selection, e.g. power-based or shortest path routing - H04L 45/121: by minimising delays - H04L 45/22: {Alternate routing} - H04L 45/24: Multipath - H04L 45/70: {Routing based on monitoring results} - H04W 24/04: Arrangements for maintaining operational condition - H04W 40/34: Modification of an existing route - H04W 84/18: Self-organising networks, e.g. ad-hoc networks or sensor 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 management apparatus (10) according to the present invention is a management apparatus for a communication system (100) configured to form redundant paths including an active path and a backup path while including a P2P (Point to Point) radio communication apparatus in the redundant paths. Further, the management apparatus (10) includes a communication unit (11) configured to receive a first transmission delay time of the active path and a plurality of second transmission delay times of a plurality of backup path candidates, and a setting unit (12) configured to select a backup path candidate from the plurality of backup path candidates based on differences between the plurality of second transmission delay times and the first transmission delay time, and set the selected backup path candidate as the backup path. ## Claims ### Claim 1 A management apparatus for a communication system configured to form redundant paths including an active path and a backup path while including a P2P (Point to Point) radio communication apparatus in the redundant paths, the management apparatus comprising: a communication unit configured to receive a first transmission delay time of the active path and a plurality of second transmission delay times of a plurality of backup path candidates; and a setting unit configured to select a backup path candidate from the plurality of backup path candidates based on differences between the plurality of second transmission delay times and the first transmission delay time, and set the selected backup path candidate as the backup path. ### Claim 2 (depends on 1) The management apparatus according to claim 1, wherein the setting unit selects a backup path candidate for which a second transmission delay time has a smallest difference from the first transmission delay time among the plurality of second transmission delay times, and sets the selected backup path candidate as the backup path. ### Claim 3 (depends on 1) The management apparatus according to claim 1, wherein the setting unit selects a backup path candidate for which a second transmission delay time among the plurality of second transmission delay times has a difference from the first transmission delay time, the difference being within the predetermined range, and sets the selected backup path candidate as the backup path. ### Claim 4 (depends on 3) The management apparatus according to claim 3, wherein when there are a plurality of backup path candidates for which differences from the first transmission delay time are within the predetermined range, the setting unit selects a backup path candidate having a smallest transmission delay time from the plurality of backup path candidates for which differences from the first transmission delay time are within the predetermined range, and sets the selected backup path candidate as the backup path. ### Claim 5 (depends on 1) The management apparatus according to claim 1, wherein the setting unit resets the backup path at a predetermined interval. ### Claim 6 A communication system configured to form redundant paths including an active path and a backup path while including a P2P (Point to Point) radio communication apparatus in the redundant paths, the communication system comprising: a network node; and a management apparatus, wherein the network node comprises: a communication unit configured to transmit/receive a packet to/from another network node; a measurement unit configured to measure a first transmission delay time of the active path and a plurality of second transmission delay times of a plurality of backup path candidates by transmitting/receiving the packet; and a monitoring control unit configured to transmit the first transmission delay time and the plurality of second transmission delay times to the management apparatus, and the management apparatus comprises: a communication unit configured to receive the first transmission delay time and the plurality of second transmission delay times; and a setting unit configured to select a backup path candidate from the plurality of backup path candidates based on differences between the plurality of second transmission delay times and the first transmission delay time, and set the selected backup path candidate as the backup path. ### Claim 7 A method performed in a management apparatus for a communication system configured to form redundant paths including an active path and a backup path while including a P2P (Point to Point) radio communication apparatus in the redundant paths, the method comprising: receiving a first transmission delay time of the active path and a plurality of second transmission delay times of a plurality of backup path candidates; selecting a backup path candidate from the plurality of backup path candidates based on differences between the plurality of second transmission delay times and the first transmission delay time; and setting the selected backup path candidate as the backup path. ### Claim 8 (depends on 7) The method according to claim 7, wherein the selecting comprises selecting a backup path candidate for which a second transmission delay time has a smallest difference from the first transmission delay time among the plurality of second transmission delay times. ### Claim 9 (depends on 7) The method according to claim 7, wherein the selecting comprises selecting a backup path candidate for which a second transmission delay time among the plurality of second transmission delay times has a difference from the first transmission delay time, the difference being within the predetermined range. ### Claim 10 (depends on 9) The method according to claim 9, wherein the selecting comprises selecting, when there are a plurality of backup path candidates for which differences from the first transmission delay time are within the predetermined range, a backup path candidate having a smallest transmission delay time from the plurality of backup path candidates for which differences from the first transmission delay time are within the predetermined range. ### Claim 11 (depends on 7) The method according to claim 7, wherein the setting comprising resetting the backup path at a predetermined interval. ### Claim 12 (canceled) ### Claim 13 A management apparatus for a communication system including a first path and a plurality of second paths, the management apparatus comprising: a communication unit configured to receive a transmission delay time in the first path and transmission delay times in the second paths; and a setting unit configured to select a backup path for the first path from the plurality of second paths based on differences between the transmission delay times in the second paths and the transmission delay time in the first path.