Wireless communication system and base station
First Claim
1. A wireless communication system that comprises a plurality of base stations including a first base station with which a terminal is configured to communicate and a second base station to which a radio signal transmitted from the terminal becomes an interference power, and is capable of performing handover of a connection destination of the terminal from the first base station to the second base station,wherein the second base station, upon detection of the interference power being more than or equal to a previously set threshold, is configured to multicast transmit information for urging the handover to multicast reception base stations that are at least a part of the base stations including the first base station, andwherein the multicast receiver base station having received the information is configured to specify a terminal that is inferred to exert the interference to the second base station that is a multicast source among the terminals connecting to the local base station and to perform a handover processing on the terminal;
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1 Assignment
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Accused Products
Abstract
To reduce an uplink interference in a network with a first base station of a large output and a second base station of a small output. Detecting the interference, the second base station urges the first base station to hand over a terminal causing it to the second base station. Multiple base stations and one or more terminals exist in this system, each terminal connects with one base station, and a serving base station is changed according to a communication state of each terminal. If the different second base station other than the first base station to which the terminal connects detects a large interference, the second base station will multicast transmit information for urging handover to the base stations except itself. The base station having received the information specifies a terminal giving the interference to the second base station, and makes it to be handed over thereto.
12 Citations
12 Claims
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1. A wireless communication system that comprises a plurality of base stations including a first base station with which a terminal is configured to communicate and a second base station to which a radio signal transmitted from the terminal becomes an interference power, and is capable of performing handover of a connection destination of the terminal from the first base station to the second base station,
wherein the second base station, upon detection of the interference power being more than or equal to a previously set threshold, is configured to multicast transmit information for urging the handover to multicast reception base stations that are at least a part of the base stations including the first base station, and wherein the multicast receiver base station having received the information is configured to specify a terminal that is inferred to exert the interference to the second base station that is a multicast source among the terminals connecting to the local base station and to perform a handover processing on the terminal; - and
wherein the multicast receiver base station is configured to specify a terminal that is inferred to exert the interference to the second base station based on downlink received power information of the terminal that the base station collects from the belonging terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A base station in a wireless communication system that includes a first base station with which a terminal is configured to communicate and the base station to which a radio signal transmitted from the terminal becomes an interference power and is capable of handing over the first base station of the terminal, comprising:
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an interference power measurement part configured to input therein the radio signal transmitted from the terminal and to measure a received power density for each unit time and for each frequency that were previously determined; a multicast transmission part configured to specify a terminal that is inferred to exert the interference to the base station and to multicast transmit information for urging the handover to multicast receiver base stations that include the first base station and are at least a part of the base stations; and an interference generation rule inferring part configured to infer an interference generation rule that is a generation rule of the received power density being more than or equal to a previously set threshold based on a received power density for each unit time and for each frequency that is measured by the interference power measurement part, wherein the multicast transmission part is configured to multicast transmit the information including the inferred interference generation rule. - View Dependent Claims (11)
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12. A base station in a wireless communication system that comprises a plurality of base stations including a first base station with which a terminal is configured to communicate and the base station to which a radio signal transmitted from the terminal becomes an interference power, and is capable of performing handover of a connection destination of the terminal, further comprising:
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a mobile-terminal-of-interference-source specifying part configured to receive information that is multicast transmitted from the base station having detected an interference power being more than or equal to a previously set threshold, and to specify a terminal that is inferred to exert the interference to the base station of the multicast source among the terminals connecting to the base station; and a handover processing part configured to perform a handover processing about the terminal specified by the mobile-terminal-of-interference-source specifying part; wherein the mobile-terminal-of-interference-source specifying part is configured to receive an interference generation rule that is based on the interference power detected by the base station and is multicast transmitted from the base station, to collate a log of an uplink communication resource that the base station allocated to the terminal and the interference generation rule, and to specify a terminal that is inferred to exert the interference power to the base station being a source of the multicast.
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Specification