REPEATER EQUIPMENT

• US 20120164939A1
• Filed: 06/11/2010
• Published: 06/28/2012
• Est. Priority Date: 06/12/2009
• Status: Abandoned Application

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Ito, Yasushi, Kumagai, Kazuhiro
• Application Number:
  US13/377,713
• Publication Number:
  US 20120164939A1
• Time in Patent Office: Days
• US Class Current: 455/7
• CPC Class Codes: H04B 7/15535 Control of relay amplifier gain amplifier gain control in general H03G3/00; gain control reducing self - or loop interference H04B7/15578
• CPC Class Codes: H04W 4/18 Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user

Abstract

A repeater equipment 10 according to the present invention includes a receiving unit 12 configured to receive broadcast information transmitted by the radio base station, and a control unit 13 configured to change a frequency band targeted for amplification of the radio signal, adaptively based on the broadcast information. Frequency range information contained in the broadcast information includes a combination of a center frequency and a bandwidth of each of one or more of frequency bands. The control unit 13 adaptively changes the frequency band targeted for amplification of the radio signal by amplifying a radio signal within a frequency band currently in use and decreasing an amplification gain for a radio signal within a frequency band currently not in use, based on the frequency range information.

Claims

1. A repeater equipment configured to amplify a radio signal received from a radio base station and then reradiate the radio signal in a downlink, the repeater equipment comprising:

a receiving unit configured to receive broadcast information transmitted by the radio base station; and

a control unit configured to change a frequency band targeted for amplification of the radio signal, adaptively based on the broadcast information, wherein

frequency range information contained in the broadcast information includes a combination of a center frequency and a bandwidth of each of one or more of frequency bands, and

the control unit adaptively changes the frequency band targeted for amplification of the radio signal by amplifying a radio signal within a frequency band currently in use and decreasing an amplification gain for a radio signal within a frequency band currently not in use, based on the frequency range information.

2. The repeater equipment according to claim 1, wherein

the receiving unit receives broadcast information with a plurality of frequencies transmitted by the radio base station, and

the control unit adaptively changes the frequency band targeted for, amplification of the radio signal by amplifying a radio signal within a frequency band currently in use and decreasing an amplification gain for a radio signal within a frequency band currently not in use, based on a frequency receivable by the receiving unit.

3. The repeater equipment according to claim 1, wherein

the frequency range information includes a combination of a center frequency, a bandwidth and a usage state of each of one or more frequency bands, the usage state indicating whether the frequency band is in use or not, and

the control unit adaptively changes the frequency band targeted for amplification of the radio signal by amplifying a radio signal within a frequency band currently in use and decreasing an amplification gain for a radio signal within a frequency band currently not in use, based on the frequency range information contained in the broadcast information.

4. The repeater equipment according to any one of claims 1 to 3, wherein the control unit changes the frequency band targeted for amplification of the radio signal, adaptively based on broadcast information transmitted by a radio base station having the largest propagation loss with the repeater equipment.

5. The repeater equipment according to any one of claims 1 to 3, wherein the control unit adaptively changes a frequency band targeted for amplification of the radio signal based on broadcast information transmitted by a radio base station providing the largest received power of a signal received by the repeater equipment via the downlink common control channel.

6. The repeater equipment according to claim 4, wherein the control unit changes the amplification gain based on the smallest value of the propagation loss.

7. The repeater equipment according to claim 5, wherein the control unit changes the amplification gain so that a signal transmitted via the downlink common control channel has power of a constant value.

8. The repeater equipment according to any one of claims 1 to 7, wherein the receiving unit periodically receives broadcast information transmitted by the radio base station.

9. The repeater equipment according to claim 1, wherein, from among radio signals received via an uplink, the control unit amplifies a radio signal in the frequency band currently in use and decreases an amplification gain for a radio signal in the frequency band currently not in use.

10. The repeater equipment according to claim 5, wherein the control unit changes the amplification gain so that a specific channel of the downlink common control channels provides constant output.