Communication control device, communication control method, communication system and communication device

A communication control method for controlling communication of a plurality of secondary usage nodes respectively providing second communication services using a part of a frequency band assigned to a first communication service, the communication control method comprising:

• receiving access technique information indicating radio access techniques usable by corresponding secondary usage nodes from the corresponding secondary usage nodes;
• storing the received access technique information;
• and
• when at least a portion of a second service area of a second-order second communication service of a second secondary usage node is included in a first service area of a first-order second communication service of a first secondary usage node, determining whether or not at least a part of communication resources can be shared between the first-order second communication service of the first secondary usage node and the second-order second communication service of the second secondary usage node based on the radio access techniques of the first-order second communication service of the first secondary usage node and the second-order second communication service of the second secondary usage node indicated by the access technique information,
• wherein the first service area corresponds to the first-order second communication service provided by the first secondary usage node, and the second service area corresponds to the second-order second communication service provided by the second secondary usage node,
• the first-order second communication service of the first secondary usage node is an orthogonal frequency-division multiple access (OFDMA) service, and
• a second radio access technique indicated by the access technique information corresponding to the second-order second communication server of the second secondary usage node is a carrier sense multiple access (CSMA) service.

A communication system which includes a plurality of secondary usage nodes respectively providing second communication services using a part of a frequency band assigned to a first communication service and a communication control device controlling communication of the plurality of secondary usage nodes,

• wherein each of the secondary usage nodes includes:
• communication circuitry that transmits access technique information indicating radio access techniques usable by corresponding secondary usage nodes to the communication control device,
• wherein the communication control device includes:
• circuitry configured to:
• receive the access technique information from the corresponding secondary usage nodes;
• store, in a memory, the access technique information;
• and
• when at least a portion of a second service area of a second-order second communication service of a second secondary usage node is included in a first service area of a first-order second communication service of a first secondary usage node, determine whether or not at least a part of communication resources can be shared between the first-order second communication service of the first secondary usage node and the second-order second communication service of the second secondary usage node based on the radio access techniques of the first-order second communication service of the first secondary usage node and the second-order second communication service of the second secondary usage node indicated by the access technique information, and
• wherein the first service area corresponds to the first-order second communication service provided by the first secondary usage node, and the second service area corresponds to the second-order second communication service provided by the second secondary usage node,
• the first-order second communication service of the first secondary usage node is an orthogonal frequency-division multiple access (OFDMA) service, and
• a second radio access technique indicated by the access technique information corresponding to the second-order second communication server of the second secondary usage node is a carrier sense multiple access (CSMA) service.

A communication device which provides a second communication service using a part of a frequency band assigned to a first communication service, the communication device comprising:

• circuitry configured to:
• transmit access technique information indicating a radio access technique usable by the communication device to another device in order to cause the another device to determine whether or not it is necessary to allow a part of communication resources to be shared between the second communication service of the communication device and another second communication service of another communication device;
• and
• specify a range of communication resources to which the another second communication service of the another communication device is to be allowed to share in response to a request from the another device when the another device determines that at least a portion of a service area of the second communication service of the communication device includes another service area of the another second communication service of the another communication device, and it is necessary to allow sharing of the part of the communication resources of the second communication service of the communication device with the another second communication service of the another communication device based on the access technique information,
• wherein the service area corresponds to the second communication service provided by the communication device, and the another service area corresponds to the another second communication service provided by the another communication device,
• the radio access technique usable by the communication device is an orthogonal frequency-division multiple access (OFDMA) service, and
• a second radio access technique usable by the another device is a carrier sense multiple access (CSMA) service.