Radio communication apparatus, radio communication method, communication channel assigning method and assigning apparatus

A radio communication method used in constructing an ad-hoc network by multiple radio communication apparatuses, the radio communication method comprising:

• the step of adopting a TDD-CDMA system common to communication in a mobile communication network and using the same frequency band as that of the mobile communication network, for communication within the ad-hoc network.

A radio communication apparatus which uses a TDD-CDMA system for communication with a base station in a mobile communication network, the radio communication apparatus comprising:

• ad-hoc communication means for constructing an ad-hoc network with other radio communication apparatuses existing therearound to wirelessly communicate with the said other radio communication apparatuses;
• wherein the ad-hoc communication means adopts a TDD-CDMA system common to the mobile communication network and uses the same frequency band as that of the mobile communication network when communicating with the said other radio communication apparatuses within the ad-hoc network, and synchronizes with the communication in the mobile communication network to communicate with the said other radio communication apparatuses within the ad-hoc network.

A radio communication method used in constructing an ad-hoc network by multiple radio communication apparatuses, the radio communication method comprising:

• the step of adopting a TDD-CDMA system common to communication in a mobile communication network and using the same frequency band as that of the mobile communication network, for communication within the ad-hoc network, and synchronizing with the communication in the mobile communication network to perform the communication within the ad-hoc network.

A radio communication apparatus which communicates with a base station in a mobile communication network with use of a TDD-CDMA system as a mobile station of the mobile communication network, the radio communication apparatus comprising:

• ad-hoc communication means for constructing an ad-hoc network with other radio communication apparatuses existing therearound to wirelessly communicate with the said other radio communication apparatuses;
• wherein
• the ad-hoc communication means adopts a TDD-CDMA system common to the mobile communication network and uses the same frequency band as that of the mobile communication network in communication with the said other radio communication apparatuses in the ad-hoc network, and uses, in the communication area of each base station of the mobile communication network, a spreading code orthogonal with a spreading code used for communication with the base station, for communication within the ad-hoc network.

A radio communication apparatus which uses a TDD-CDMA system for communication with a base station in a mobile communication network, the radio communication apparatus comprising:

• ad-hoc communication means for constructing an ad-hoc network with other radio communication apparatuses existing therearound to wirelessly communicate with the said other radio communication apparatuses;
• wherein the ad-hoc communication means adopts a TDD-CDMA system common to the mobile communication network and uses the same frequency band as that of the mobile communication network when communicating with the said other radio communication apparatuses, and comprises interference signal removal means for removing interference signals other than a desired signal transmitted from the said other radio communication apparatuses.

A radio communication apparatus which uses a TDD-CDMA system for communication with a base station in a mobile communication network, the radio communication apparatus comprising:

• ad-hoc communication means for constructing an ad-hoc network with other radio communication apparatuses existing therearound to wirelessly communicate with the said other radio communication apparatuses;
• wherein the ad-hoc communication means adopts a TDD-CDMA system common to the mobile communication network and uses the same frequency band as that of the mobile communication network when communicating with the said other radio communication apparatuses, and measures the power of interference signals for each of time slots specified for the uplink and the downlink transmission of the mobile communication network to select time slots to be used for communication within the ad-hoc network based on the measured values.

A radio communication apparatus which uses any telecommunication system among a TDD-CDMA system, a TDD-TDMA system and a TDD-OFDM system for communication with a base station in a mobile communication network, the radio communication apparatus comprising:

• ad-hoc communication means for constructing an ad-hoc network with other radio communication apparatuses existing therearound to wirelessly communicate with the said other radio communication apparatuses;
• wherein the ad-hoc communication means uses a telecommunication system common to and the same frequency band as communication with the base station of the mobile communication network when communicating with the said other radio communication apparatuses.