# US 8,787,185 B2 · Base station, wireless communication system, method for controlling base station, wireless communication method, control program, and mobile station > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,185 B2 - Document ID: US8787185B2 - Status: Granted - Kind: B2 - Application number: 13/140,631 - Filed: 2009-12-14 - Published: 2012-01-19 - Granted: 2014-07-22 - Earliest claimed: 2008-12-19 - Assignees: NEC Corporation - Applicants: Kazushi Muraoka; Kojiro Hamabe; Masayuki Ariyoshi; Toshifumi Nakamura - Inventors: Kazushi Muraoka; Kojiro Hamabe; Masayuki Ariyoshi; Toshifumi Nakamura - Web page: https://patentgrep.com/patent/US8787185B2 ## CPC - H04W 52/0206: {in access points, e.g. base stations} - H04W 52/16: Deriving transmission power values from another channel - H04W 52/241: {taking into account channel quality metrics, e.g. SIR, SNR, CIR or Eb/lo} - H04W 52/325: {Power control of control or pilot channels} - H04L 5/0023: {Time-frequency-space} - H04W 52/143: {Downlink power control} - H04W 52/262: {taking into account adaptive modulation and coding [AMC] scheme} - 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) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - 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 [Problem] The number of the base stations that are activated uselessly cannot be sufficiently reduced even in a light traffic state. As a result, interference between adjacent cells and power consumption cannot be sufficiently reduced. [Means For Solving the Problems] The base station controls transmission of a control signal according to communication quality in a wireless link between a mobile station and another base station. ## Claims ### Claim 1 A base station comprising: a recognition unit that recognizes the communication quality in a wireless link between a mobile station and another base station; a transmission control unit that controls the transmission of a control signal based on a recognized communication quality, and a measurement unit that measures a received power of an uplink signal transmitted from the mobile station to the another base station, wherein the recognition unit receives information about the communication quality from another apparatus, and the recognition unit recognizes operating throughput of the wireless link as the communication quality, wherein the transmission control unit controls the transmission of the control signal based on a relationship between the operating throughput and the received power, and wherein the transmission control unit starts to transmit the control signal when it is determined that expected throughput obtained when the mobile station is connected to the base station is higher than the operating throughput. ### Claim 2 (depends on 1) The base station according to claim 1, wherein the recognition unit estimates the communication quality based on an uplink signal from the mobile station to another base stations. ### Claim 3 A base station comprising: a recognition unit that recognizes the communication quality in a wireless link between a mobile station and another base station; a transmission control unit that controls the transmission of a control signal based on a recognized communication quality, and a measurement unit that measures the reception sensitivity of an uplink signal transmitted from the mobile station to the another base station in the base station, and the transmission control unit controls the transmission of the control signal based on a relationship between the reception sensitivity at the another base station and the reception sensitivity at the base station; wherein the recognition unit receives information about the communication quality from another apparatus and recognizes a reception sensitivity of the wireless link as the communication quality at the another base station, and wherein the transmission control unit starts to transmit the control signal when it is determined that reception sensitivity at the base station is higher than the reception sensitivity at the another base station . ### Claim 4 (depends on 3) The base station according to claim 3, wherein the reception sensitivity at the base station or the another base station is a signal to noise ratio of the wireless link. ### Claim 5 (depends on 1) The base station according to claim 1, wherein the transmission control unit determines whether or not the mobile station is located in a communication range of the base station and controls the transmission of the control signal when the mobile station is located in the communication range. ### Claim 6 (depends on 5) The base station according to claim 5, wherein the transmission control unit determines that the mobile station is located in the range when the received power of the uplink signal that is transmitted from the mobile station to another base station is equal to or greater than a predetermined threshold value. ### Claim 7 A base station comprising: a recognition unit that recognizes the communication quality in a wireless link between a mobile station and another base station; and a transmission control unit that controls the transmission of a control signal based on a recognized communication quality, wherein the base station further comprises a specification unit for receives signal to interference noise ratio information and wireless resource allocation information of the mobile station communicating with another base station from another apparatus, specifying the uplink signal of the mobile station whose signal to interference noise ratio is low from the wireless resource allocation information, measuring the received power of the specified uplink signal, and thereby, specifying the mobile station whose communication quality of the wireless link is degraded and which is located in a cell of the base station and the control unit controls the transmission of the control signal based on the specified result of the specification unit. ### Claim 8 A wireless communication system comprising: a first base station, a second base station, and at least one mobile station which can communicate with the first base station and the second base station; wherein the second base station comprises: a recognition unit that recognizes the communication quality in a wireless link between the mobile station and the first base station, a transmission control unit that controls transmission of a control signal according to a recognized communication quality in the wireless link between the mobile station and the first base station, and a measurement unit that measures a received power of an uplink signal transmitted from the mobile station to the first base station, wherein the recognition unit receives information about the communication quality from another apparatus and the recognition unit recognizes operating throughput of the wireless link as the communication quality, wherein the transmission control unit controls the transmission of the control signal based on a relationship between the operating throughput and the received power, and wherein the transmission control unit starts to transmit the control signal when it is determined that expected throughput obtained when the mobile station is connected to the second base station is higher than the operating throughput. ### Claim 9 A method for controlling a base station, the method comprising: recognizing communication quality in a wireless link between a mobile station and another base station, measuring a received power of an uplink signal transmitted from the mobile station to the another base station, and controlling transmission of a control signal from the base station based on the recognized communication quality, wherein the recognizing the communication quality comprises receiving information about the communication quality from another apparatus, and recognizing an operating throughput of the wireless link as the communication quality, and wherein controlling the transmission of the control signal comprises controlling the transmission of the control signal based on a relationship between the operating throughput and the received power, and starting to transmit the control signal when it is determined that expected throughput obtained when the mobile station is connected to the base station is higher than the operating throughput. ### Claim 10 A wireless communication method in a wireless communication system including a first base station, a second base station, and at least one mobile station which can communicate with the first base station and the second base station, the method comprising: the section base station, recognizing communication quality in a wireless link between the mobile station and the first base station, measuring a received power of an uplink signal transmitted form the mobile station to the first base station, and controlling transmission of a control signal from the second base station based on the recognized communication quality wherein the recognizing the communication quality comprises receiving information about the communication quality from another apparatus and recognizing an operating throughput of the wireless link as the communication quality, wherein the controlling the transmission of the control signal comprises controlling the transmission of the control signal based on a relationship between the operating throughput and the received power, and starting to transmit the control signal when it is determined that expected throughput obtained when the mobile station is connected to the base station is higher than the operating throughput. ### Claim 11 A computer readable medium which causes a computer of a base station to perform a method comprising: recognizing communication quality in a wireless link between a mobile station and another base station, measuring a received power of an uplink signal transmitted from the mobile station to the another base station, and controlling transmission of a control signal from the base station based on the recognized communication quality, wherein the recognizing the communication quality comprises receiving information about the communication quality from another apparatus, and recognizing an operating throughput of the wireless link as the communication quality, and wherein controlling the transmission of the control signal comprises controlling the transmission of the control signal based on a relationship between the operating throughput and the received power, and starting to transmit the control signal when it is determined that expected throughput obtained when the mobile station is connected to the base station is higher than the operating throughput. ### Claim 12 A mobile station which can communicate with a first base station and a second base station the mobile station comprising: a transmitting unit that transmits an uplink signal to the first base station, wherein the uplink signal is received by the second base station, and a receiving unit that receives a control signal transmitted from the second base station based on communication quality in a wireless link between the mobile station and the first base station that is recognized based on the transmission signal in the second base station, wherein the receiving unit starts to receive the control signal when the second base station determines that expected throughput obtained when the mobile station is connected to the second base station is higher than an operating throughput of a wireless link between the mobile station and the first base station.