Multi-hop communication system, radio control station, radio station and multi-hop communication method
First Claim
1. A radio station, comprising:
- a control signal reception unit configured to receive a control signal, broadcast from a radio control station, for communication connection with the radio control station;
a reception level measuring unit configured to measure a reception level of the control signal broadcast from the radio control station, at the radio station;
a relay controlling unit configured to receive a relay control signal to which a reception level of the control signal at an other radio station is added, the relay control signal being transmitted from a source radio station to the radio control station so as to set a communication route from the source radio station to the radio control station via at least one radio station; and
an information signal transmission/reception unit configured to relay an information signal, which is different from the control signal, to an other radio station according to the communication route in which the relay control signal is relayed, whereinwhen the reception level added to the relay control signal is smaller than the reception level at the radio station, the relay controlling unit adds the reception level at the radio station to the received relay control signal, and relays the relay control signal, to which the reception level at the radio station is added, to other neighboring radio stations;
when the radio station is a source of the information signal, the information signal transmission/reception unit transmits the information signal according to the communication route notified by a response relay control signal which is transmitted by a direct radio station capable of transmitting the information signal to the radio control station directly; and
the response relay control signal is transmitted by the direct radio station in response to receiving the relay control signal at the direct radio station.
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Accused Products
Abstract
The multi-hop communication system according to the present invention is configured by a radio control station 1 connected to a core network, and radio stations 21, 22, 31-33. The radio control station 1 has a control signal TX/RX unit 12 which transmits/receives the control signal, an information signal TX/RX unit 13 which transmits/receives the information signal, and a communication channel controller 15 which transmits a “usage notification” indicating usage of communication channels managed by the radio control station 1 to the radio stations 21, 22, 31-33 using the control signal. The radio station has a control signal TX/RX unit 42 which transmits/receives the control signal, and an information signal TX/RX unit 43 which transmits/receives the information signal.
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Citations
12 Claims
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1. A radio station, comprising:
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a control signal reception unit configured to receive a control signal, broadcast from a radio control station, for communication connection with the radio control station; a reception level measuring unit configured to measure a reception level of the control signal broadcast from the radio control station, at the radio station; a relay controlling unit configured to receive a relay control signal to which a reception level of the control signal at an other radio station is added, the relay control signal being transmitted from a source radio station to the radio control station so as to set a communication route from the source radio station to the radio control station via at least one radio station; and an information signal transmission/reception unit configured to relay an information signal, which is different from the control signal, to an other radio station according to the communication route in which the relay control signal is relayed, wherein when the reception level added to the relay control signal is smaller than the reception level at the radio station, the relay controlling unit adds the reception level at the radio station to the received relay control signal, and relays the relay control signal, to which the reception level at the radio station is added, to other neighboring radio stations; when the radio station is a source of the information signal, the information signal transmission/reception unit transmits the information signal according to the communication route notified by a response relay control signal which is transmitted by a direct radio station capable of transmitting the information signal to the radio control station directly; and the response relay control signal is transmitted by the direct radio station in response to receiving the relay control signal at the direct radio station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A multi-hop communication system configured by a radio control station and a plurality of radio stations, wherein, one radio station included in the plurality of the radio stations comprises:
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a control signal reception unit configured to receive a control signal, broadcast from the radio control station, for communication connection with the radio control station; a reception level measuring unit configured to measure a reception level of the control signal broadcast from the radio control station, at the one radio station; a relay controlling unit configured to receive a relay control signal to which a reception level of the control signal at an other radio station is added, the relay control signal being transmitted from a source radio station to the radio control station so as to set a communication route from the source radio station to the radio control station via at least one radio station; and an information signal transmission/reception unit configured to relay an information signal, which is different from the control signal, to an other radio station according to the communication route in which the relay control signal is relayed, wherein when the reception level added to the relay control signal is smaller than the reception level at the one radio station, the relay controlling unit adds the reception level at the one radio station to the received relay control signal, and relays the relay control signal, to which the reception level at the one radio station is added, to other neighboring radio stations; a direct radio station which can transmit the information signal to the radio control station directly, among the plurality of the radio stations, transmits a response relay control signal notifying the communication route in which the relay control signal is relayed, in response to receiving the relay control signal; and the source radio station, which is a source of the information signal, transmits the information signal according to the route notified by the response relay control signal.
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12. A multi-hop communication method for a radio control station and a plurality of radio stations comprising:
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receiving, by one radio station of the plurality of radio stations, a control signal, broadcast from the radio control station, for communication connection with the radio control station; measuring a reception level of the control signal broadcast from the radio control station at the one radio station; receiving a relay control signal to which a reception level of the control signal at an other radio station is added, the relay control signal being transmitted from a source radio station to the radio control station so as to set a communication route from the source radio station to the radio control station via at least one radio station; comparing, at the one radio station, the reception level added to the relay control signal with the reception level of the one radio station; adding the reception level at the one radio station to the received relay control signal, and relaying the relay control signal, to which the reception level at the one radio station is added, to other neighboring radio stations, when the reception level added to the relay control signal is smaller than the reception level of the one radio station; transmitting, at a direct radio station which can transmit the information signal different from the control signal to the radio control station directly, a response relay control signal notifying the communication route in which the relay control signal is relayed, in response to receiving of the relay control signal; transmitting, at a source radio station which is a source of the information signal, the information signal according to the communication route notified by the response relay control signal; and relaying the information signal to an other radio station according to the communication route notified by the response relay control signal.
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Specification