# US 9,439,108 B2 · Management method, management node, communication system, and recording medium for program > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,439,108 B2 - Document ID: US9439108B2 - Status: Granted - Kind: B2 - Application number: 14/342,145 - Filed: 2012-08-22 - Published: 2014-10-09 - Granted: 2016-09-06 - Earliest claimed: 2011-09-01 - Assignees: NEC Corporation - Applicants: Akihiko Kubota; Junko Kubota - Inventors: Mitsuhiro Kubota - Web page: https://patentgrep.com/patent/US9439108B2 ## CPC - H04W 36/0061: {of neighbour cell information} - H04W 36/00835: {Determination of neighbour cell lists} - H04W 36/0072: {of resource information of target access point} - H04W 36/385: {of the core network} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract In order to solve the problem that a handover failure rate of a mobile terminal becomes high in a case in which the number of the cells described in the adjacent cell list does not meet a specific condition, for example, a case in which many cells which have a small coverage area are included in the list, a case in which many highly loaded cells are included in the list, or the like, a management method includes a collection step in which information about a cell of a wireless base station is collected from the wireless base station which manages the cell and a list change step in which a list is changed based on the collected information about the cell so that the number of the cells described in the list of the cells adjacent to the wireless base station may meet a specific condition. ## Claims ### Claim 1 A management method comprising: collecting information about a cell of a wireless base station from the wireless base station which manages the cell; changing a list based on the collected information about the cell so that a number of the cells described in the list of the cells adjacent to the wireless base station may meet a specific condition, wherein the information about the cell includes information about an area of the coverage area of the cell; and determining whether the coverage area of each cell described in the list is large or small, wherein the specific condition includes a condition in which the number of the cells of which each of coverage areas is determined as being small does not exceed a third threshold value. ### Claim 2 (depends on 1) The management method described in claim 1, wherein the information about the cell further includes information about a load on the cell. ### Claim 3 (depends on 2) The management method described in claim 2, further comprising determining whether or not the load on each cell described in the list exceeds a first threshold value, wherein the specific condition includes a condition in which the number of the cells of which each of loads is determined as exceeding the first threshold value does not exceed a second threshold value. ### Claim 4 (depends on 1) The management method described in claim 1, wherein the change in the list includes moving a cell which meets the specific condition among the cells described in the list to the higher position in the list. ### Claim 5 (depends on 1) The management method described in claim 1, wherein the change in the list includes deleting a cell which does not meet the specific condition among the cells described in the list from the list. ### Claim 6 (depends on 1) The management method described in claim 1, wherein: in the collecting, load information about the cell is collected periodically; and the load information about the cell described in the list is updated. ### Claim 7 (depends on 6) The management method described in claim 6, wherein in the collecting, when the number of successes of the handover of the cell described in the list is less than or equal to a fourth threshold value, the load information about the cell described in the list is updated. ### Claim 8 (depends on 1) The management method described in claim 1, wherein: in the collecting, area information on the coverage area of the cell is collected periodically; and the area information on the coverage area of the cell described in the list is updated. ### Claim 9 (depends on 8) The management method described in claim 8, wherein in the collecting, when the number of successes of the handover of the cell described in the list is less than or equal to a fifth threshold value, the area information on the coverage area of the cell described in the list is updated. ### Claim 10 A management node connected to a wireless base station which manages a cell, comprising: a collection unit which collects information about the cell of the wireless base station from the wireless base station; a list change unit which changes a list based on the collected information about the cell so that a number of the cells described in the list of the cells adjacent to the wireless base station may meet a specific condition, wherein the information about the cell includes information about an area of the coverage area of the cell; and a determining unit which determines whether the coverage area of each cell described in the list is large or small, wherein the specific condition includes a condition in which the number of the cells of which each of coverage areas is determined as being small does not exceed a third threshold value. ### Claim 11 A communication system comprising: a wireless base station which manages a cell; and a management node connected to the wireless base station, wherein the management node includes: a collection unit which collects information about the cell of the wireless base station from the wireless base station; and a list change unit which changes a list based on the collected information about the cell so that a number of the cells described in the list of the cells adjacent to the wireless base station may meet a specific condition, wherein the information about the cell includes information about an area of the coverage area of the cell; and a determining unit which determines whether the coverage area of each cell described in the list is large or small, wherein the specific condition includes a condition in which the number of the cells of which each of coverage areas is determined as being small does not exceed a third threshold value.