Multi-feeder link configuration in haps communication system and control therefor
It is suppressed of a deterioration of a communication quality of a service link (SL), which is caused by an increase of signal attenuation in a propagation path of a feeder link (FL) between an aerial-staying type communication relay apparatus and a gateway (GW) station. A relay communication station of the communication relay apparatus comprises a FL communication section that performs a feeder-link radio communication with each of a first gateway station and a second gateway station corresponding to a first cell and a second cell which are adjacent to each other, a SL communication section that performs a radio communication with a terminal apparatus in each SL of the first cell and the second cell, and a control section that controls the SL communication section so that a shape of the second cell is changed to include a part or a whole of the first cell, when a radio communication quality in the FL propagation path with the first gateway station corresponding to the first cell is deteriorated or when the deterioration of the radio communication quality is predicted.
1. A remote control apparatus for remotely controlling a communication relay apparatus having a feeder-link communication section that performs a feeder-link radio communication with each of a first gateway station and a second gateway station corresponding to each of a first cell and a second cell adjacent to each other, a service-link communication section that performs a radio communication with a terminal apparatus in each service link of the first cell and the second cell, and a control section that controls the service-link communication section so that a shape of the second cell is changed to include a whole of the first cell when a deterioration of a radio communication quality of the feeder link with the first gateway station corresponding to the first cell is predicted, the control section performing a control based on the control information received by the control-information receiving section, the remote control apparatus comprising:
an information acquisition section that acquires at least one of weather forecast information on an area including the propagation path of the feeder link with the first gateway station, maintenance schedule information of the first gateway station, monitoring information including a reception level of the feeder link with the first gateway station, flight path information on the communication relay apparatus, position information on the communication relay apparatus, and attitude information on the communication relay apparatus;
a control-information generating section that, in response to the deterioration of the radio communication quality of the feeder link between the communication relay apparatus and the first gateway station being predicted, generates control information for controlling the feeder-link communication section and the service-link communication section based on the information acquired by the information acquisition section; and
a control-information transmitting section that transmits the control information to the communication relay apparatus.
2. A communication system, comprising:
a communication relay apparatus having a feeder-link communication section that performs a feeder-link radio communication with each of a first gateway station and a second gateway station corresponding to each of a first cell and a second cell adjacent to each other, a service-link communication section that performs a radio communication with a terminal apparatus in each service link of the first cell and the second cell, and a control section that controls the service-link communication section so that a shape of the second cell is changed to include a whole of the first cell when a deterioration of a radio communication quality of the feeder link with the first gateway station corresponding to the first cell is predicted, the control section performing a control based on the control information received by the control-information receiving section; and
a remote control apparatus for remotely controlling the communication relay apparatus having an information acquisition section that acquires at least one piece of weather forecast information on an area including the propagation path of the feeder link with the first gateway station, maintenance schedule information of the first gateway station, and monitoring information including a reception level of the feeder link with the first gateway station, a control-information generating section that, in response to the deterioration of the radio communication quality of the feeder link between the communication relay apparatus and the first gateway station being predicted, generates control information for controlling the feeder-link communication section and the service-link communication section based on the information acquired by the information acquisition section, and a control-information transmitting section that transmits the control information to the communication relay apparatus.
3. The communication system according to claim 2 , further comprising a first base station connected to the first gateway station, and a second base station connected to the second gateway station.
4. The communication system according to claim 3 , wherein the first base station and the second base station perform a process of handing over plural terminal apparatuses connected to the first cell to the second cell in order, after the change of the shape of the second cell is completed or after the feeder link communication between the communication relay apparatus and the second gateway station is started.
5. The communication system according to claim 4 ,
wherein the first base station and the second base station stop a communication of a user data signal with the terminal apparatus during a processing period of the handover.
6. A remote control apparatus for remotely controlling the communication relay apparatus having a feeder-link communication section that performs a radio communication with a first gateway station and a second gateway station corresponding to each of a first cell and a second cell formed in a common area, a footprint of the second cell overlapping a footprint of the first cell as a whole, a service-link communication section that performs a radio communication with a terminal apparatus in at least one of the service links of the first cell and the second cell in the common area, a control section that controls the feeder-link communication section so as to start a communication with the second gateway station when a deterioration of a radio communication quality of the feeder link with the first gateway station is predicted in a status of stopping the communication with the second gateway station, and a control-information receiving section that receives control information from a remote control apparatus and performs a control based on the control information received by the control-information receiving section, the remote control apparatus comprising:
an information acquisition section that acquires at least one of weather forecast information on an area including the propagation path of the feeder link with the first gateway station, maintenance schedule information of the first gateway station, monitoring information including a reception level of the feeder link with the first gateway station, flight path information on the communication relay apparatus, position information on the communication relay apparatus, and attitude information on the communication relay apparatus;
a control-information generating section that, in response to the deterioration of the radio communication quality of the feeder link between the communication relay apparatus and the first gateway station being predicted, generates control information for controlling the feeder-link communication section and the service-link communication section based on the information acquired by the information acquisition section; and
a control-information transmitting section that transmits the control information to the communication relay apparatus.
7. A communication system, comprising:
a communication relay apparatus having a feeder-link communication section that performs a radio communication with a first gateway station and a second gateway station corresponding to each of a first cell and a second cell formed in a common area, a footprint of the second cell overlapping a footprint of the first cell as a whole, a service-link communication section that performs a radio communication with a terminal apparatus in at least one of the service links of the first cell and the second cell in the common area, a control section that controls the feeder-link communication section so as to start a communication with the second gateway station when a deterioration of a radio communication quality of the feeder link with the first gateway station is predicted in a status of stopping the communication with the second gateway station, and a control-information receiving section that receives control information from a remote control apparatus and performs a control based on the control information received by the control-information receiving section; and
a remote control apparatus for remotely controlling the communication relay apparatus having an information acquisition section that acquires at least one piece of weather forecast information on an area including the propagation path of the feeder link with the first gateway station, maintenance schedule information of the first gateway station, and monitoring information including a reception level of the feeder link with the first gateway station, a control-information generating section that, in response to the deterioration of the radio communication quality of the feeder link between the communication relay apparatus and the first gateway station being predicted, generates control information for controlling the feeder-link communication section and the service-link communication section based on the information acquired by the information acquisition section, and a control-information transmitting section that transmits the control information to the communication relay apparatus.
8. The communication system according to claim 7 , further comprising a first base station connected to the first gateway station, and a second base station connected to the second gateway station.
9. The communication system according to claim 7 ,
wherein the first base station and the second base station perform a process of handing over plural terminal apparatuses connected to the first cell to the second cell in order, after the change of the shape of the second cell is completed or after the feeder link communication between the communication relay apparatus and the second gateway station is started.