JP2006303590A5 - - Google Patents

Claims (13)

  A communication device applied to any one of a plurality of wireless communication systems using different frequency bandwidths within the same frequency band,
  An occupancy signal generator that generates an occupancy signal that is compatible with other radio communication systems and notifies a communication device of the other radio communication system that the frequency band is occupied;
  Among the frequency bands used for communication, a detection unit that detects an empty frequency band,
  And a transmitter that transmits the occupancy signal in the detected frequency band each time a free frequency band is detected by the detector.   The communication apparatus according to claim 1, wherein the transmission unit transmits a data frame having a different modulation method for each frequency bandwidth.   The communication device according to claim 1, wherein the occupation signal generation unit generates an occupation signal for notifying a communication device of another wireless communication system that the entire frequency bandwidth to be used is occupied.   The occupying signal generation unit generates an occupying signal for notifying a communication device of another wireless communication system that the frequency band to be used is occupied for a maximum period. The communication device described in Crab.   The occupied signal generator is
  When occupying a part of the frequency bandwidth to be used first, an occupancy signal is generated to notify a communication device of another wireless communication system that the part of the frequency band is occupied for a maximum period or a predetermined period,
  When another part of the frequency bandwidth to be used is occupied for the second time or later, an occupancy signal for ending the period for occupying the other part of the frequency bandwidth is generated at the end of the maximum period or the predetermined period. The communication device according to claim 1 or 2, characterized by the above.   The detection unit finally ends communication with a communication device of the other wireless communication system based on a frequency band occupation situation of the communication device of another wireless communication system using at least a part of the used frequency band. Detect the communication end time of the frequency band to be
  The communication device according to claim 1, wherein the occupying signal generation unit generates an occupying signal that ends a period of occupying a frequency band at the detected communication end time.   The transmission unit is based on a transmission signal interval in the communication device of the other wireless communication system with reference to a time when transmission in the communication device of another wireless communication system using at least a part of the frequency band to be used is completed. The communication apparatus according to any one of claims 1 to 6, wherein the occupied signal is transmitted by setting a transmission signal interval so that the transmission signal interval is shortened.   The transmission unit uses a transmission signal interval in the communication device of the other wireless communication system as a reference, based on a time when transmission in the communication device of another wireless communication system using at least a part of the frequency band to be used is completed. The backoff period is set so that the transmission signal interval and the total period of randomly set backoff periods are shorter than the total period of randomly set backoff periods, and the occupied signal is transmitted. The communication device according to any one of claims 1 to 6, wherein   9. The communication device according to claim 1, wherein the transmitting unit transmits an occupied signal again with respect to a used frequency bandwidth after occupying a used frequency band. 10.   A wireless communication system that uses different frequency bandwidths depending on the type of communication device within a specific frequency band,
  A communication device applied to the wireless communication system is:
  An occupancy signal generator that generates an occupancy signal that is compatible with other types of communication devices and notifies other types of communication devices that the frequency band is occupied;
  Among the frequency bands used for communication, a detection unit that detects an empty frequency band,
  A wireless communication system, comprising: a transmission unit that transmits the occupied signal in the detected frequency band each time a free frequency band is detected by the detection unit.   A communication method of a communication device applied to any one of a plurality of wireless communication systems using different frequency bandwidths within the same frequency band,
  An occupancy signal generation step for generating an occupancy signal that is compatible with other radio communication systems and notifies a communication device of the other radio communication system that the frequency band is occupied;
  Among the frequency bands used for communication, a detection step for detecting a vacant frequency band;
  A communication method comprising at least a transmission step of transmitting the occupied signal in the detected frequency band every time a free frequency band is detected in the detection step.   An access point comprising the communication device according to any one of claims 1 to 9.   A wireless LAN system comprising the access point according to claim 12 and a station.