RADIO COMMUNICATION APPARATUS AND METHOD

• US 20110019634A1
• Filed: 02/20/2009
• Published: 01/27/2011
• Est. Priority Date: 03/06/2008
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Yoshino, Hitoshi, Fujii, Hiromasa
• Granted Patent: US 8,295,226 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA

Abstract

A disclosed radio communication apparatus includes an intermediate band detecting unit detecting an intermediate band which is a band between a first frequency band and a second frequency band which are allocated to a same mobile communication system or different mobile communication systems, a use status detecting unit detecting an uplink/downlink multiplexing method used in each of the first frequency band and the second frequency band, and a determination unit determining, based on the intermediate band and the uplink/downlink multiplexing method, the uplink/downlink multiplexing method usable in the intermediate band and a guard band in which use of frequencies are prevented, the guard band being included in the intermediate band.

Claims

1. A radio communication apparatus comprising:

an intermediate band detecting unit configured to detect an intermediate band which is a band between a first frequency band and a second frequency band which are allocated to a same mobile communication system or different mobile communication systems;

a use status detecting unit configured to detect an uplink/downlink multiplexing method used in each of the first frequency band and the second frequency band; and

a determination unit configured to determine, based on the intermediate band and the uplink/downlink multiplexing method, the uplink/downlink multiplexing method usable in the intermediate band and a guard band in which use of frequencies are prevented, the guard band being included in the intermediate band.

2. The radio communication apparatus according to claim 1, wherein

the intermediate band includes one pair of bands and the guard band, the one pair of bands including an uplink band and a downlink band.

3. The radio communication apparatus according to claim 2, wherein

a width of the guard band varies depending on whether a transmission direction of a band adjacent to the guard band on a higher-frequency side is a same as the transmission direction of a band adjacent to the guard band on a lower-frequency side.

4. The radio communication apparatus according to claim 2, wherein

depending on whether a transmission direction of a band adjacent to the guard band on a higher-frequency side is a same as the transmission direction of a band adjacent to the guard band on a lower-frequency side, a transmission power varies at least one of the higher-frequency side and the lower-frequency side of the intermediate band.

5. The radio communication apparatus according to claim 1, wherein

a Time Division Duplexing (TDD) scheme is used in both a band adjacent to the guard band on a higher-frequency side and a band adjacent to the guard band on a lower-frequency side, and

an uplink/downlink ratio of radio resources is a same between the bands.

6. The radio communication apparatus according to claim 1, wherein

a Time Division Duplexing (TDD) scheme is used in both a band adjacent to the guard band on a higher-frequency side and a band adjacent to the guard band on a lower-frequency side, and

a frame length or an uplink/downlink ratio of radio resources is different between the bands.

7. The radio communication apparatus according to claim 6, wherein

a width of the guard band varies depending on whether a transmission direction of the band adjacent to the guard band on the higher-frequency side is a same as the transmission direction of the band adjacent to the guard band on the lower-frequency side.

8. The radio communication apparatus according to claim 3, wherein

the width of the guard band or a transmission power of at least one of the band adjacent to the guard band on the higher-frequency side and the band adjacent to the guard band on the higher-frequency side varies depending on an interference signal level received from a mobile communication system different from a mobile communication system to which the radio communication apparatus belongs.

9. The radio communication apparatus according to claim 1, further comprising:

a receiving section configured to receive a control signal indicating at least one of frequency information of the intermediate band, a transmission power allowed in the intermediate band, and the guard band.

10. A method used in a radio communication apparatus, the method comprising:

an intermediate band detecting step of detecting an intermediate band which is a band between a first frequency band and a second frequency band which are allocated to a same mobile communication system or different mobile communication systems;

a use status detecting step of detecting an uplink/downlink multiplexing method used in each of the first frequency band and the second frequency band; and

a determination step of determining, based on the intermediate band and the uplink/downlink multiplexing method, the uplink/downlink multiplexing method usable in the intermediate band and a guard band in which use of frequencies are prevented, the guard band being included in the intermediate band.