Band sharing communication system, line control method, line control device, and line control program

A line control method for a band sharing communication system in which there are a primary system and a secondary system in descending order of priority of communication, the systems share frequency bands, and allocation of a requested band of a terminal station of each system is performed, the method comprising:

• setting a frequency band to be occupied by the primary system as a primary occupied band and a frequency band adjacent to the primary occupied band and to be occupied by the secondary system as a secondary occupied band;
• allocating a vacant band of the primary occupied band with respect to a requested band of a primary terminal station of the primary system and allocating a vacant band of the secondary occupied band with respect to a requested band of a secondary terminal station of the secondary system;
• when there is no vacant band in the primary occupied band with respect to the requested band of the primary terminal station and when a vacant band equivalent to the requested band is present in the secondary occupied band such that the vacant band is adjacent to the primary occupied band, transferring the vacant band from the secondary occupied band to the primary occupied band and allocating the vacant band to the primary terminal station, and when communication is being performed in a band in the secondary occupied band which is adjacent to the primary occupied band and equivalent to the requested band, transferring a vacant band created by making a suspension request to the secondary terminal station performing the communication from the secondary occupied band to the primary occupied band and allocating the vacant band to the primary terminal station;
• and
• performing a reconnection process using a vacant band in the secondary occupied band for the communication of the secondary terminal station to which the suspension request has been made.

A line control device for a band sharing communication system in which there are a primary system and a secondary system in descending order of priority of communication, the systems share frequency bands, and allocation of a requested band of a terminal station of each system is performed, the line control device comprising:

• a processor;
• and
• a non-transitory storage medium having computer program instructions stored thereon, when executed by the processor, perform to:
• set a frequency band to be occupied by the primary system as a primary occupied band and a frequency band adjacent to the primary occupied band and to be occupied by the secondary system as a secondary occupied band;
• allocate a vacant band of the primary occupied band with respect to a requested band of a primary terminal station of the primary system and allocating a vacant band of the secondary occupied band with respect to a requested band of a secondary terminal station of the secondary system;
• and
• when there is no vacant band in the primary occupied band with respect to the requested band of the primary terminal station and when a vacant band equivalent to the requested band is present in the secondary occupied band such that the vacant band is adjacent to the primary occupied band, transfer the vacant band from the secondary occupied band to the primary occupied band and allocate the vacant band to the primary terminal station, and when communication is being performed in a band in the secondary occupied band which is adjacent to the primary occupied band and equivalent to the requested band, transfer a vacant band created by making a suspension request to the secondary terminal station performing the communication from the secondary occupied band to the primary occupied band and allocate the vacant band to the primary terminal station;
• and
• perform a reconnection process using a vacant band in the secondary occupied band for the communication of the secondary terminal station to which the suspension request has been made.