Radio terminal apparatus and its reception control program

• US 7,069,041 B2
• Filed: 07/12/2002
• Issued: 06/27/2006
• Est. Priority Date: 07/19/2001
• Status: Expired due to Term

• Current Assignee: Hera Wireless S.A. (Fineur International S.A.)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Nakao, Seigo, Miyata, Takeo, Ito, Tadayoshi, Doi, Yoshiharu
• Primary Examiner(s): Feild, Joseph
• Assistant Examiner(s): Figueroa, Marisol
• Application Number:
  US10/483,977
• Publication Number:
  US 20040185893A1
• Time in Patent Office: 1,446 Days
• Field of Search: 455/452.1, 455/525, 455/550.1, 455/553.1, 455/63.4, 455/25
• US Class Current: 455/525
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas

Abstract

A base station transmits information in a downlink signal that identifies whether the base station is an adaptive array base station. If a terminal capable of performing diversity reception determines that a terminal to be connected is an adaptive array base station, it stops to perform diversity reception and set an antenna used for an uplink signal transmission to be used for an immediately following reception among a plurality of antennas (11, 12). Thus, a reception effectively utilizing transmission directivity from the adaptive array base station is attained, and interference wave can be reduced. These process are executed with software by DSP (18).

Claims

1. A radio terminal apparatus in a mobile communication system, said mobile communication system including a plurality of radio base stations, each of said plurality of radio base stations transmitting a signal containing information that identifies a type of the radio base station, said radio terminal apparatus comprising:

determination means for receiving a signal from a radio base station to be connected among said plurality of radio base stations, and determining a type of the radio base station based on said information; and

selection means for selecting a reception operation mode regarding reception directivity for receiving a signal from the radio base station in accordance with the determined type of the radio base station.

2. A radio terminal apparatus capable of performing diversity reception using a plurality of antennas in a mobile communication system, said mobile communication system including a plurality of radio base stations, each of said plurality of radio base stations transmitting information that identifies whether the radio base station is a radio base station performing an adaptive array operation with directivity, said radio terminal apparatus comprising:

determination means for receiving a signal from a radio base station to be connected among said plurality of radio base stations, and determining whether the radio base station is a radio base station performing said adaptive array operation based on said information; and

set means for setting an antenna used for a signal transmission to the radio base station among said plurality of antennas to be used for a signal reception from the radio base station that immediately follows the signal transmission when the radio base station is determined to be a radio base station performing said adaptive array operation, and for setting said plurality of antennas to be used for receiving a signal from the radio base station by diversity reception when the radio base station is determined to be a radio base station not performing said adaptive array operation.

3. A radio terminal apparatus capable of selectively performing adaptive array reception or diversity reception using a plurality of antennas in a mobile communication system, said mobile communication system including a plurality of radio base stations, each of said plurality of radio base stations transmitting information that identifies whether the radio base station is a radio base station performing an adaptive array operation with directivity, said radio terminal apparatus comprising:

determination means for receiving a signal from a radio base station to be connected among said plurality of radio base stations, and determining whether the radio base station is a radio base station performing said adaptive array operation based on said information; and

set means for setting said plurality of antennas to be used for receiving a signal from the radio base station by adaptive array reception when the radio base station is determined to be a radio base station performing said adaptive array operation, and for setting said plurality of antennas to be used for receiving a signal from the radio base station by diversity reception or adaptive array reception when the radio base station is determined to be a radio base station not performing said adaptive array operation.

4. A radio terminal apparatus capable of performing diversity reception using a plurality of antennas in a mobile communication system, said mobile communication system including a plurality of radio base stations, each of said plurality of radio base stations transmitting information that identifies whether the radio base station is a radio base station performing a spatial multiplexing operation with directivity, said radio terminal apparatus comprising:

determination means for receiving a signal from a radio base station to be connected among said plurality of radio base stations, and determining whether the radio base station is a radio base station performing said spatial multiplexing operation based on said information; and

set means for setting an antenna used for a signal transmission to the radio base station among said plurality of antennas to be used for a signal reception from the radio base station that immediately follows the signal transmission when the radio base station is determined to be a radio base station performing said spatial multiplexing operation, and for setting said plurality of antennas to be used for receiving a signal from the radio base station by diversity reception when the radio base station is determined to be a radio base station not performing said spatial multiplexing operation.

5. A radio terminal apparatus capable of selectively performing adaptive array reception or diversity reception using a plurality of antennas in a mobile communication system, said mobile communication system including a plurality of radio base stations, each of said plurality of radio base stations transmitting information that identifies whether the radio base station is a radio base station performing a spatial multiplexing operation with directivity, said radio terminal apparatus comprising:

determination means for receiving a signal from a radio base station to be connected among said plurality of radio base stations, and determining whether the radio base station is a radio base station performing said spatial multiplexing operation based on said information; and

set means for setting said plurality of antennas to be used for receiving a signal from the radio base station by adaptive array reception when the radio base station is determined to be a radio base station performing said spatial multiplexing operation, and for setting said plurality of antennas to be used for receiving a signal from the radio base station by diversity reception or adaptive array reception when the radio base station is determined to be a radio base station not performing said spatial multiplexing operation.

6. A method for controlling a reception operation in a radio terminal apparatus in a mobile communication system, said mobile communication system including a plurality of radio base stations, each of said plurality of radio base stations transmitting a signal containing information that identifies a type of the radio base station, said method comprising the steps of:

a determination step of receiving a signal from a radio base station to be connected among said plurality of radio base stations, and determining a type of the radio base station based on information contained in the received signal; and

a selection step of selecting a reception operation mode regarding reception directivity for receiving a signal from the radio base station in accordance with the determined type of the radio base station.

7. A method for controlling a reception operation in a radio terminal apparatus capable of performing diversity reception using a plurality of antennas in a mobile communication system, said mobile communication system including a plurality of radio base stations, each of said plurality of radio base stations transmitting information that identifies whether the radio base station is a radio base station performing an adaptive array operation with directivity, comprising the steps of:

a determination step of receiving a signal from a radio base station to be connected among said plurality of radio base stations, and determining whether the radio base station is a radio base station performing said adaptive array operation based on information contained in the received signal; and

a set step of setting an antenna used for a signal transmission to the radio base station among said plurality of antennas to be used for a signal reception from the radio base station that immediately follows the signal transmission when the radio base station is determined to be a radio base station performing said adaptive array operation, and for setting said plurality of antennas to be used for receiving a signal from the radio base station by diversity reception when the radio base station is determined to be a radio base station not performing said adaptive array operation.

8. A method for controlling a reception operation in a radio terminal apparatus capable of selectively performing adaptive array reception or diversity reception using a plurality of antennas in a mobile communication system, said mobile communication system including a plurality of radio base stations, each of said plurality of radio base stations transmitting information that identifies whether the radio base station is a radio base station performing an adaptive array operation with directivity, said method comprising the steps of:

a determination step of receiving a signal from a radio base station to be connected among said plurality of radio base stations, and determining whether the radio base station is a radio base station performing said adaptive array operation based on said information contained in the received signal; and

a set step of setting said plurality of antennas to be used for receiving a signal from the radio base station by adaptive array reception when the radio base station is determined to be a radio base station performing said adaptive array operation, and for setting said plurality of antennas to be used for receiving a signal from the radio base station by diversity reception or adaptive array reception when the radio base station is determined to be a radio base station not performing said adaptive array operation.

9. A method for controlling a reception operation in a radio terminal apparatus capable of performing diversity reception using a plurality of antennas in a mobile communication system, said mobile communication system including a plurality of radio base stations, each of said plurality of radio base stations transmitting information that identifies whether the radio base station is a radio base station performing spatial multiplexing operation with directivity, said method comprising the steps of:

a determination step of receiving a signal from a radio base station to be connected among said plurality of radio base stations, and determining whether the radio base station is a radio base station performing said spatial multiplexing operation based on information contained in the received signal; and

a set step of setting an antenna used for a signal transmission to the radio base station among said plurality of antennas to be used for a signal reception from the radio base station that immediately follows the signal transmission when the radio base station is determined to be a radio base station performing said spatial multiplexing operation, and for setting said plurality of antennas to be used for receiving a signal from the radio base station by diversity reception when the radio base station is determined to be a radio base station not performing said spatial multiplexing operation.

10. A method for controlling a reception operation in a radio terminal apparatus capable of selectively performing adaptive array reception or diversity reception using a plurality of antennas in a mobile communication system, said mobile communication system including a plurality of radio base stations, each of said plurality of radio base stations transmitting information that identifies whether the radio base station is a radio base station performing a spatial multiplexing operation with directivity, said method comprising the steps of:

a determination step of receiving a signal from a radio base station to be connected among said plurality of radio base stations, and determining whether the radio base station is a radio base station performing said spatial multiplexing operation based on information contained in the received signal; and

a set step of setting said plurality of antennas to be used for receiving a signal from the radio base station by adaptive array reception when the radio base station is determined to be a radio base station performing said spatial multiplexing operation, and for setting said plurality of antennas to be used for receiving a signal from the radio base station by diversity reception or adaptive array reception when the radio base station is determined to be a radio base station not performing said spatial multiplexing operation.