# US 2014/0155073 A1 · Base station and handover control method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0155073 A1 - Document ID: US20140155073A1 - Status: Published application - Kind: A1 - Application number: 14/059,764 - Filed: 2013-10-22 - Published: 2014-06-05 - Earliest claimed: 2012-12-05 - Assignees: Fujitsu Limited - Applicants: Fujitsu Limited - Inventors: Hiroyuki Kida; Kenichi NUNOKAWA; Shoichiro EBESU - Web page: https://patentgrep.com/patent/US20140155073A1 ## CPC - H04W 36/324: {by mobility data, e.g. speed data} - H04W 36/322: {by location data} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A base station performs communication with a terminal by using a cell defined as a combination of a frequency and an area reachable by a signal transmitted from the base station. The base station specifies, for each of cells, a first area in which disconnection of communication with a terminal occurs more frequently as compared to another area. The base station controls handover that changes a current cell of a first terminal to another cell, based on information on the specified first area and the current cell of the first terminal, and a position, moving speed, and moving direction of the first terminal. ## Claims ### Claim 1 A base station comprising: a processor configured: to perform communication with a terminal by using a cell defined as a combination of a frequency and an area reachable by a signal transmitted from the base station, to specify, for each of cells, a first area in which disconnection of communication with a terminal occurs more frequently as compared to another area, and to control handover that changes a current cell of a first terminal to another cell, based on information on the specified first area and the current cell of the first terminal, and a position, moving speed, and moving direction of the first terminal; and a memory configured to store information on areas and the cells. ### Claim 2 (depends on 1) The base station of claim 1, wherein the processor determines whether or not the first terminal is expected to enter one of the specified first areas that corresponds to a cell having a frequency equal to that of the current cell of the first terminal, based on information on the one of the first areas and the position and moving direction of the first terminal; the processor calculates a time needed for the first terminal to enter the one of the first areas, based on information on the one of the first areas and the position and moving speed of the first terminal; and the processor causes the first terminal to perform handover thereof when it is determined that the first terminal is expected to enter the one of the first areas and the calculated time is less than a first threshold. ### Claim 3 (depends on 1) The base station of claim 1, wherein the processor obtains a first report transmitted from each of terminals each time communication for the each terminal is disconnected, the first report including positional information of the each terminal at a time when the communication is disconnected; and the processor counts, based on the obtained first report, a count value defined as a number of times the communication is disconnected, for each mesh code, and sets, as the first area, an area corresponding to a mesh code for which the count value is equal to or greater than a second threshold. ### Claim 4 (depends on 3) The base station of claim 3, wherein the processor groups a plurality of mesh codes for which the count value is equal to or greater than the second threshold and whose corresponding areas form a continuous area, into a same group. ### Claim 5 (depends on 4) The base station of claim 4, wherein the processor sets, as the first area, a rectangular area including all of areas corresponding to mesh codes included in the same group. ### Claim 6 (depends on 1) The base station of claim 1, wherein the processor performs handover of the first terminal to a cell that includes neither the first area of the base station nor the first area of adjacent base stations adjacent to the base station. ### Claim 7 (depends on 2) The base station of claim 2, wherein the processor cyclically obtains, from each terminal included in an area of the base station, a second report including a position, moving speed, and a moving direction of the each terminal; and when a transmission source terminal that has issued the obtained second report is connected to a cell including the first area of the base station, the processor determines whether or not the transmission source terminal is expected to enter the first area of the base station. ### Claim 8 (depends on 7) The base station of claim 7, wherein the processor sets a cycle of the second report transmitted by the transmission source terminal connected to a cell including the first area of the base station, at a value shorter than a cycle of the second report transmitted by the transmission source terminal that is not connected to a cell including the first area of the base station. ### Claim 9 (depends on 1) The base station of claim 1, wherein the processor determines whether or not the first terminal is expected to enter the first area, based on information on one of the first areas whose frequency is equal to that of the current cell of the first terminal, and the position and moving direction of the first terminal; the processor calculates, based on the position and moving speed of the first terminal, a time needed for the first terminal to pass through the first area; and the processor excludes the first terminal from targets of handover when it is determined that the first terminal is expected to enter the first area and the calculated time is less than a second threshold. ### Claim 10 A handover control method comprising: specifying, for each of cells, a first area in which disconnection of communication with a terminal occurs more frequently as compared to another area, the each cell being defined as a combination of a frequency and an area reachable by a signal transmitted from the base station; and controlling handover that changes a current cell of a first terminal to another cell, based on information on the specified first area and the current cell of the first terminal, and a position, moving speed, and moving direction of the first terminal.