Interference detection and interference suppression of reverse link communication in feeder link of HAPS communication system

A common baseband processing apparatus connected to plural gateway stations that respectively perform a feeder-link radio communication with a plurality of movable aerial-floating type communication relay apparatuses, the communication relay apparatuses respectively including a relay communication station of performing a service-link radio communication with a terminal apparatus, the common baseband processing apparatus comprising:

• a base-station control section;
• and
• a baseband section, and
• wherein, in cooperation with the baseband section, the base-station control section:
• detects an interference of a reverse link communication between the feeder links due to an interference wave (I_REV) from a relay communication station of another communication relay apparatus by confirming whether or not a signal wave as the interference wave (I_REV) is received from the relay communication station of the other communication relay apparatus, for each of gateway antennas of the plural gateway stations, the interference wave (I_REV) interfering with a signal wave (S_REV) from the relay communication station of the communication relay apparatus connected to the gateway station, based on plural reception signals received by the plural gateway stations;
• performs a reception process of processing plural reception signals received by the plural gateway stations, as reception signals received by plural antennas;
• compares a signal-wave (S_REV) reception level and an interference-wave (I_REV) reception level of a reverse link communication for each of the antennas, based on a reception signal of each of the plural antennas obtained in the reception process;
• and
• determines that the interference of the reverse link communication between the feeder links due to the interference wave (I_REV) from the relay communication station of the other communication relay apparatus is occurred, when a difference between the signal-wave (S_REV) reception level and the interference-wave (I_REV) reception level becomes equal to or less than a predetermined threshold value, or when a ratio of the interference-wave (I_REV) reception level to the signal-wave (S_REV) reception level becomes equal to or more than a predetermined threshold value.

A method for detecting an interference of a reverse link communication directing from a relay communication station to a gateway station in feeder links between a plurality of movable aerial-floating type communication relay apparatuses and plural gateway stations, the communication relay apparatuses respectively including a relay communication station of performing a service-link radio communication with a terminal apparatus,

• wherein the method comprises:
• detecting an interference of a reverse link communication between the feeder links due to an interference wave (I_REV) from a relay communication station of another communication relay apparatus by confirming whether or not a signal wave as the interference wave (I_REV) is received from the relay communication station of the other communication relay apparatus, for each of gateway antennas of the plural gateway stations, the interference wave (I_REV) interfering with a signal wave (S_REV) from the relay communication station of the communication relay apparatus connected to the gateway station, based on plural reception signals received by the plural gateway stations;
• performing a reception process of processing plural reception signals received by the plural gateway stations, as reception signals received by plural antennas;
• comparing a signal-wave (S_REV) reception level and an interference-wave (I_REV) reception level of the reverse link communication for each of the antennas, based on the reception signal of each of the plural antennas obtained in the reception process;
• and
• determining that the interference of the reverse link communication between the feeder links due to the interference wave (I_REV) from the relay communication station of the other communication relay apparatus is occurred, when a difference between the signal-wave (S_REV) reception level and the interference-wave (I_REV) reception level becomes equal to or less than a predetermined threshold value, or when a ratio of the interference-wave (I_REV) reception level to the signal-wave (S_REV) reception level becomes equal to or more than a predetermined threshold value.

A non-transitory computer readable medium containing a program executed by a computer or a processor provided in a common baseband processing apparatus connected to plural gateway stations that respectively perform a feeder-link radio communication with a plurality of movable aerial-floating type communication relay apparatuses, the communication relay apparatuses respectively including a relay communication station of performing a service-link radio communication with a terminal apparatus, wherein the program comprises:

• a program code for detecting an interference of a reverse link communication between the feeder links due to an interference wave (I_REV) from a relay communication station of another communication relay apparatus by confirming whether or not a signal wave as the interference wave (I_REV) is received from the relay communication station of the other communication relay apparatus, for each of gateway antennas of the plural gateway stations, the interference wave (I_REV) interfering with a signal wave (S_REV) from the relay communication station of the communication relay apparatus connected to the gateway station, based on the plural reception signals received by the plural gateway stations;
• a program code for performing a reception process of processing plural reception signals received by the plural gateway stations, as reception signals received by plural antennas;
• a program code for comparing a signal-wave (S_REV) reception level and an interference-wave (I_REV) reception level of the reverse link communication for each of the antennas, based on the reception signal of each of the plural antennas obtained in the reception process;
• and
• a program code for determining that the interference of the reverse link communication between the feeder links due to the interference wave (I_REV) from the relay communication station of the other communication relay apparatus is occurred, when a difference between the signal-wave (S_REV) reception level and the interference-wave (I_REV) reception level becomes equal to or less than a predetermined threshold value, or when a ratio of the interference-wave (I_REV) reception level to the signal-wave (S_REV) reception level becomes equal to or more than a predetermined threshold value.