# US 12,192,751 B2 · Method and apparatus for switching aerial base stations in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,751 B2 - Document ID: US12192751B2 - Status: Granted - Kind: B2 - Application number: 17/826,569 - Filed: 2022-05-27 - Published: 2022-12-22 - Granted: 2025-01-07 - Earliest claimed: 2021-06-15 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Soon Gi Park; Jun Sik Kim; Seung Jae Bahng; Jung Sook Bae; Heesoo Lee - Web page: https://patentgrep.com/patent/US12192751B2 ## CPC - H04W 36/165: {for reducing network power consumption (H04W36/18 - H04W36/22 take precedence)} - H04W 36/083: {wherein at least one of the access points is a moving node} - H04W 36/302: {due to low signal strength} - H04W 36/00695: {using split of the control plane or user plane} - H04W 84/005: {Moving wireless networks} - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A method for controlling base stations in a wireless communication system may include: performing a monitoring operation on a first base station forming a first cell in a predetermined communication area; determining whether the first base station needs to be replaced; when the first base station needs to be replaced, controlling a second base station to move in a direction of the first base station and form a second cell; when coverages of the first and second cells overlap fully or partially, decreasing a transmit power of the first base station and increasing a transmit power of the second base station; and in response to identifying that all of one or more communication nodes connected to the first cell are handed over to the second base station, determining that the first base station is successfully replaced with the second base station. ## Claims ### Claim 1 A method for controlling base stations in a wireless communication system, the method comprising: performing a monitoring operation on a first base station that is mounted on a first aerial vehicle and forms a first cell in a predetermined communication area at a predetermined aerial position; determining whether the first base station needs to be replaced; in response to determining that the first base station needs to be replaced, controlling a second base station mounted on a second aerial vehicle to move in a direction of the first base station and form a second cell; in response to determining that coverages of the first and second cells overlap by more than a first reference value, decreasing a transmit power of the first base station and increasing a transmit power of the second base station; and in response to identifying that all of one or more communication nodes, which were connected to the first cell, are handed over to the second base station, determining that the first base station is successfully replaced with the second base station. ### Claim 2 (depends on 1) The method according to claim 1, wherein the performing of the monitoring operation comprises: identifying at least one of a remaining amount of a power source of the first aerial vehicle, whether the first aerial vehicle or a first aerial vehicle system including the first base station operates normally, or a combination thereof. ### Claim 3 (depends on 2) The method according to claim 2, wherein the determining of whether the first base station needs to be replaced comprises: in response to determining that the remaining amount of the power source of the first aerial vehicle is less than a first preset threshold, determining that the first base station needs to be replaced. ### Claim 4 (depends on 2) The method according to claim 2, wherein the determining of whether the first base station needs to be replaced comprises: in response to determining that a part of one or more components constituting the first aerial vehicle system does not operate normally, determining that the first base station needs to be replaced. ### Claim 5 (depends on 1) The method according to claim 1, wherein the decreasing of the transmit power of the first base station and the increasing of the transmit power of the second base station comprises: decreasing the transmit power of the first base station based on a first function; and increasing the transmit power of the second base station based on a second function. ### Claim 6 (depends on 5) The method according to claim 5, wherein the first and second functions correspond to linear functions or non-linear functions that are configured to derive a constant function when mutually summed. ### Claim 7 A method for controlling base stations in a wireless communication system, the method comprising: performing a monitoring operation on a first base station that is mounted on a first aerial vehicle and forms a first cell in a predetermined communication area at a predetermined aerial position; determining whether the first base station needs to be replaced; in response to determining that the first base station needs to be replaced, controlling a second base station mounted on a second aerial vehicle to move in a direction of the first base station and form a second cell; in response to determining that coverages of the first and second cells overlap by more than a first reference value, changing each of the coverages of the first and second cells through physical controls on a first aerial vehicle system including the first base station and a second aerial vehicle system including the second base station; and in response to identifying that all of one or more communication nodes, which were connected to the first cell, are located out of the coverage of the first cell and located in the coverage of the second cell, determining that the first base station is successfully replaced with the second base station. ### Claim 8 (depends on 7) The method according to claim 7, wherein the performing of the monitoring operation comprises: identifying at least one of a remaining amount of a power source of the first aerial vehicle, whether the first aerial vehicle or the first aerial vehicle system including the first base station operates normally, or a combination thereof. ### Claim 9 (depends on 7) The method according to claim 7, wherein in the changing of each of the coverages of the first and second cells, the coverages of the first and second cells are respectively changed by moving a position of the first aerial vehicle and a position of the second aerial vehicle. ### Claim 10 (depends on 7) The method according to claim 7, wherein in the changing of each of the coverages of the first and second cells, the coverages of the first and second cells are respectively changed by changing each of a direction in which the first aerial vehicle faces and a direction in which the second aerial vehicle faces. ### Claim 11 (depends on 7) The method according to claim 7, wherein in the changing of each of the coverages of the first and second cells, the coverages of the first and second cells are respectively changed by changing each of a direction in which a first antenna of the first base station faces and a direction in which a second antenna of the second base station faces. ### Claim 12 An apparatus for controlling base stations in a wireless communication system, the apparatus comprising: a processor; a memory electronically communicating with the processor; and instructions stored in the memory, wherein when executed by the processor, the instructions cause the apparatus to: perform a monitoring operation on a first base station that is mounted on a first aerial vehicle and forms a first cell in a predetermined communication area at a predetermined aerial position; determine whether the first base station needs to be replaced; in response to determining that the first base station needs to be replaced, control a second base station mounted on a second aerial vehicle to move in a direction of the first base station and form a second cell; in response to determining that coverages of the first and second cells overlap by more than a first reference value, perform at least one of an operation of controlling each of transmit powers of the first and second base stations and an operation of changing coverages of the first and second cells through physical controls on a first aerial vehicle system including the first base station and a second aerial vehicle system including the second base station; and in response to identifying that all of one or more communication nodes, which were connected to the first cell, are handed over to the second base station, determine that the first base station is successfully replaced with the second base station. ### Claim 13 (depends on 12) The apparatus according to claim 12, wherein the instructions further cause the apparatus to identify at least one of a remaining amount of a power source of the first aerial vehicle, whether the first aerial vehicle or the first aerial vehicle system including the first base station operates normally, or a combination thereof. ### Claim 14 (depends on 12) The apparatus according to claim 12, wherein in the performing of the operation of controlling each of transmit powers of the first and second base stations, the instructions further cause the apparatus to decrease the transmit power of the first base station based on a first function and increase the transmit power of the second base station based on a second function, and the first and second functions correspond to linear functions or non-linear functions that are configured to derive a constant function when mutually summed. ### Claim 15 (depends on 12) The apparatus according to claim 12, wherein in the performing of the operation of changing coverages of the first and second cells, the instructions further cause the apparatus to control each of the first aerial vehicle and the second aerial vehicle to move a position thereof. ### Claim 16 (depends on 12) The apparatus according to claim 12, wherein in the performing of the operation of changing coverages of the first and second cells, the instructions further cause the apparatus to control each of the first aerial vehicle and the second aerial vehicle to change a direction in which each of the first aerial vehicle and the second aerial vehicle faces. ### Claim 17 (depends on 12) The apparatus according to claim 12, wherein in the performing of the operation of changing coverages of the first and second cells, the instructions further cause the apparatus to control each of the first base station and the second base station to change a direction in which an antenna thereof faces. ### Claim 18 (depends on 12) The apparatus according to claim 12, wherein the instructions further cause the apparatus to perform both the operation of controlling each of the transmit powers of the first and second base stations and the operation of changing the coverages of the first and second cells.