Site-to-site transmission/propagation delay correction during application of site diversity in haps feeder link

A communication system for performing a communication via a radio relay apparatus located in an upper airspace,

• wherein a plurality of gateway stations for forming radio sections of a plurality of feeder links with the radio relay apparatus are disposed at a plurality of locations geographically separated from each other on the ground or on the sea,
• wherein the communication system comprises a base station connected to the plurality of gateway stations,
• wherein the communication system comprises a management apparatus for managing current position information of each of the radio relay apparatus, the gateway stations and the base station,
• wherein, in each of the plurality of forward links for transmitting a signal to the radio relay apparatus via the plurality of gateway stations, the base station:
• calculates an offset according to both delay times of a transmission delay time between the base station and the gateway station and a propagation delay time between the gateway station and the radio relay apparatus, based on the current position information of each of the radio relay apparatus, the gateway stations and the base station which is acquired from the management apparatus;
• and
• shifts a transmission timing of the signal by the calculated offset.

A communication system for performing a communication via a radio relay apparatus located in an upper airspace,

• wherein a plurality of gateway stations for forming radio sections of a plurality of feeder links with the radio relay apparatus are disposed at a plurality of locations geographically separated from each other on the ground or on the sea,
• wherein the communication system comprise a base station connected to the plurality of gateway stations,
• wherein the communication system comprises a management apparatus for managing current position information of each of the radio relay apparatus, the gateway stations and the base station,
• wherein, in each of the plurality of forward links for transmitting a signal to the radio relay apparatus via the plurality of gateway stations, each of the plurality of gateway stations:
• calculates an offset according to a propagation delay time between the gateway station and the radio relay apparatus, based on the current position information of each of the radio relay apparatus, the gateway stations and the base station which is acquired from the management apparatus;
• and
• shifts a transmission timing of the signal by the calculated offset, and
• wherein, in each of the plurality of forward links, the base station:
• calculates an offset according to a transmission delay time between the base station and the gateway station, based on the current position information of each of the radio relay apparatus, the gateway stations and the base station which is acquired from the management apparatus;
• and
• shifts a transmission timing of the signal by the calculated offset.

A method of operating a gateway station that is one of a plurality of gateway stations disposed at a plurality of locations geographically separated from each other on a ground or on a sea so as to form a radio section of a feeder link between the gateway station and a radio relay apparatus located in an upper airspace,

• the gateway station performing simultaneous transmissions/receptions of signals in cooperation with other gateway stations other than the own station among the plurality of gateway stations, or transmissions/receptions of signals accompanied by a switching with the other gateway stations, with the radio relay apparatus,
• in a forward link for transmitting a signal to the radio relay apparatus or in a reverse link for receiving a signal from the radio relay apparatus, the gateway station:
• calculating an offset according to both delay times of a transmission delay time between the base station and the own gateway station and a propagation delay time between the own gateway station and the radio relay apparatus, based on the current position information of each of the radio relay apparatus, the own gateway station and the base station connected to the own gateway station which is acquired from a management apparatus;
• and
• shifting a transmission timing of the signal of the forward link or a reception timing of the signal of the reverse link by the calculated offset.

A method of operating a base station connected to a plurality of gateway stations, the plurality of gateway stations being disposed at a plurality of locations geographically separated from each other on the ground or on the sea so as to form radio sections of a plurality of feeder links between the gateway stations and a radio relay apparatus located in an upper airspace,

• the base station performing simultaneous transmissions/receptions of signals via the plurality of feeder links or transmissions/receptions of signals accompanied by a switching of the feeder links, with the radio relay apparatus, and
• in each of a plurality of forward links for transmitting signals to the radio relay apparatus via the plurality of gateway stations or in each of a plurality of reverse links for receiving signals from the radio relay apparatus via the plurality of gateway stations, the base station:
• calculating an offset according to both delay times of a transmission delay time between the own base station and the gateway station and a propagation delay time between the gateway station and the radio relay apparatus, based on the current position information of each of the radio relay apparatus, the gateway stations and the own base station which is acquired from a management apparatus;
• and
• shifting a transmission timing of the signal of the forward link or a reception timing of the signal of the reverse link by the calculated offset.