Radio communication device and radio communication system

A radio communications system comprising:

• a transmit side radio communication device for establishing a connection via a wireless network provided with a radio control unit for achieving timing synchronization using frames having a fixed period, assigning a transmission and reception interval during which a report signal for informing state management information about each radio communication device and a control signal for controlling said each radio communication device are transmitted and received to a fixed time interval at a head of each of the frames, for achieving timing synchronization using frames having a fixed period with which to transmit and receive application data to and from a partner radio communication device during another time interval, assigning a transmission and reception interval during which a report signal for informing state management information about said each radio communication device and a control signal for controlling said each radio communication device are transmitted and received to a fixed time interval at a head of each of the frames, for transmitting and receiving application data to and from a partner radio communication device during another time interval, and for reserving and securing one or more of communication band units, each of which has a fixed width and into which each frame is divided according to a difference between a transmission rate of said application data and that of a signal in a wireless section, on a unit-by-unit basis by using said report signal and said control signal, said transmit side radio communication device determining an available communication band from the state management information about said wireless network and also determining the transmission rate of the wireless section and a required communication band from the transmission rate of said application data while informing a reservation for said determined communication band to a receive side radio communication device by using said control signal;
• and
• said receive side radio communication device that receives said reservation informed thereto, and determines whether or not communications can be carried out from both an internal state of said receive side radio communication device itself and the state management information about said wireless network,
• wherein said transmit side radio communication device secures said reserved communication band in response to a response showing that communications can be carried out from said receive side radio communication device.