Patent ID: 11902795
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A line control apparatus including a shared band in which a first frequency band used by a first wireless communication system and a second frequency band used by a second wireless communication system overlap with each other and allocating the first frequency band and the second frequency band including the shared band to terminal stations of the respective wireless communication systems, the line control apparatus comprising:
a control unit configured to:
identify a use status of the first frequency band and the second frequency band,
release an allocated band of a terminal station of the second wireless communication system, in a case where a terminal station of the first wireless communication system performs a new band allocation request, wherein the second wireless communication system is configured to perform spectrum division transmission and the first wireless communication system is allocated only continuous frequency bands,
upon receipt of a new band allocation request, check whether the band allocation request is from a terminal station of the first wireless communication system or from a terminal station of the second wireless communication system, determine whether there is a continuous unused band sufficient for the requested band, and allocate the unused band to one or more terminals of the first wireless communication system in a case where there is a sufficient unused band in any one of the first and second wireless communication systems, and

in a case where there is no continuous unused band sufficient for the requested band:
if the band allocation request is from a terminal station of the second system that is configured to perform spectrum division transmission, terminate without performing the band allocation when the band allocation cannot be performed even if the spectrum division transmission is performed; and
if the band allocation request is from a terminal station of the first system that is allocated only continuous bands, determine if a frequency band allocated to one or more terminal stations of the second communication system can be used to create a continuous frequency band and, if so, release the allocated frequency band from the second communication system and allocate a continuous frequency band including at least a portion of the released frequency band to the first communication system.