Calibration method, and base station apparatus, terminal apparatus and radio apparatus utilizing the same

• US 20060183504A1
• Filed: 02/14/2006
• Published: 08/17/2006
• Est. Priority Date: 02/15/2005
• Status: Active Grant

• Current Assignee: Hera Wireless S.A. (Fineur International S.A.)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Tanaka, Yasuhiro, Nakao, Seigo
• Granted Patent: US 7,904,116 B2
• Time in Patent Office: Days
• US Class Current: 455/561
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements

Abstract

An examining unit examines the radio wave environments on at least one of a plurality of frequency channels usable in communications. Based on a result of examination by the examining unit, a selector selects a frequency channel to be used for communications. While using the channel selected by the selector, an execution unit transmits signals from a plurality of antennas to a terminal apparatus and performs calibration on the plurality of antennas by receiving signals from the terminal apparatus via the plurality of antennas.

Claims

1. A base station apparatus, comprising:

an examining unit which examines a radio wave environment on at least one of a plurality of frequency channels usable for communications;

a selector which selects one frequency channel to be used for communications, based on an examination result by said examining unit; and

an execution unit which transmits signals from a plurality of antennas to a terminal apparatus using the one frequency channel selected by said selector and which performs calibration on the plurality of antennas by receiving signals from the terminal apparatus by the plurality of antennas.

2. A base station apparatus according to claim 1, further comprising a receiver which receives signals from a plurality of terminal apparatuses,

wherein, based on the signals received by said receiver, said execution unit selects from the plurality of terminal apparatuses a terminal apparatus usable for calibration.

3. A base station apparatus according to claim 2, wherein said execution unit derives a quality of signals received by said receiver and utilizes the derived quality for selecting the terminal apparatus.

4. A base station apparatus according to claim 1, further comprising a storage unit which stores a result of calibration, executed in said execution unit, in the one frequency channel selected by said selector.

5. A base station apparatus according to claim 1, further comprising a storage unit which stores, in an associated manner, a result of calibration, executed in said execution unit, in the one frequency channel selected by said selector and a number to identify a frequency channel used for calibration,

wherein at the time of execution of calibration said execution unit refers to the result of calibration and the number to identify a frequency channel, which are stored in said storage unit.

6. A terminal apparatus, comprising:

a selector which selects a base station apparatus that uses any of a plurality of channels usable for communications; and

an execution unit which transmits signals from a plurality of antennas to one base station apparatus selected by said selector and which performs calibration on the plurality of antennas by receiving signals from the selected base station apparatus by the plurality of antennas.

7. A radio apparatus, comprising:

a selector which selects, from a plurality of frequency channels usable for communications, one frequency channel to be used for communications; and

an execution unit which transmits signals from a plurality of antennas to a predetermined radio apparatus using the one frequency channel selected by said selector and which performs calibration on the plurality of antennas by receiving signals from the predetermined radio apparatus by the plurality of antennas.

8. A radio apparatus, comprising:

an examining unit which examines a radio wave environment on at least one of a plurality of frequency channels usable for communications;

a selector which selects one frequency channel to be used for communications, based on an examination result by said examining unit; and

an execution unit which transmits signals from a plurality of antennas to another radio apparatus using the one frequency channel selected by said selector and which performs calibration on the plurality of antennas by receiving signals from the another radio apparatus by the plurality of antennas.

9. A calibration method characterized in that one frequency channel to be used for communications is selected from among a plurality of frequency channels usable for communications, signals are transmitted to a radio apparatus from a plurality of antennas using the selected frequency channel, and calibration is performed on the plurality of antennas by receiving signals from the radio apparatus by the plurality of antennas.

10. A calibration method, comprising:

selecting, from a plurality of frequency channels usable for communications, one frequency channel to be used for communications; and

transmitting signals from a plurality of antennas to a predetermined radio apparatus using the one frequency channel selected by said selecting and performing calibration on the plurality of antennas by receiving signals from the predetermined radio apparatus by the plurality of antennas.

11. A calibration method according to claim 10, further comprising receiving signals from a plurality of radio apparatuses,

wherein, based on the signals received by said receiving, said transmitting and performing calibration is such that a radio apparatus usable for calibration is selected from the plurality of radio apparatuses.

12. A calibration method according to claim 11, wherein said transmitting and performing calibration is such that a quality of signals received by said receiving is derived and the derived quality is utilized for selecting the radio apparatus.

13. A calibration method according to claim 10, further comprising storing in a memory a result of calibration, executed in said transmitting and performing calibration, in the one frequency channel selected by said selecting.

14. A calibration method according to claim 10, further comprising storing in a memory, in an associated manner, a result of calibration, executed in said transmitting and performing calibration, in the one frequency channel selected by said selecting and a number to identify a frequency channel used for calibration, wherein at the time of performing calibration said transmitting and performing calibration is such that the result of calibration and the number to identify a frequency channel, which are stored in the memory, are referred to.