Radio communication method and radio base transmission station

• US 8,315,671 B2
• Filed: 08/15/2011
• Issued: 11/20/2012
• Est. Priority Date: 03/06/2006
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Kuwahara, Mikio, Fujishima, Kenzaburo, Taira, Masanori
• Primary Examiner(s): Yun, Eugene
• Application Number:
  US13/137,427
• Publication Number:
  US 20110299464A1
• Time in Patent Office: 463 Days
• Field of Search: 455/562.1, 455/63.3, 455/63.4, 455/450, 455/452, 455/446, 455/449, 455/62, 455/561, 455/25, 455/422.1, 455/424, 455/425, 455/275, 455/703
• US Class Current: 455/562.1
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 25/00 Antennas or antenna systems providing at least two radiating patterns arrangements for changing or varying the orientation or the shape of the directional pattern H01Q3/00

Abstract

An antenna pattern assigning method capable of avoiding interference between a plurality of base transmission stations constituting a radio system in a cellular type broad band communication. In the radio system, when assigning a fixed beam pattern different for each frequency, each of the radio base transmission station devices transmits a radio wave having a directivity pattern having a peak in the same direction in two or more different frequencies, and between adjacent radio base transmission station devices, radio transmission is performed by using different directivity patterns in the two or more frequencies.

Claims

1. A radio communication method for a communication system that includes radio base stations, the radio communication method comprising the steps of:

transmitting or receiving a signal by a radio wave having a plurality of directivity patterns having a peak in the same direction in each of two or more different frequency regions; and

between separate, adjacent radio base transmission station stations within the communication system, transmitting and receiving a signal with two or more different frequencies each combined with a plurality of directivity patterns in different correspondence patterns.

2. The radio communication method as claimed in claim 1, further comprising the step of:

switching the directivity patterns among plurality of units for setting a directivity pattern formed by a matrix of frequency region and time region.

3. The radio communication method as claimed in claim 1, wherein

the plurality of radio base station stations are combined as a set, in which each of the radio base station stations transmits or receives a signal by a radio wave having a directivity pattern having a peak in the same direction in each of two or more different frequency regions and, between different radio base station stations, a signal is transmitted or received with the two or more different frequencies each being combined with the directivity patterns in different correspondence patterns, and wherein a set formed by at least seven adjacent radio base transmission station stations is cyclically repeated.

4. The radio communication method as claimed in claim 1, further comprising the step of:

generating a correspondence pattern based on an orthogonal code for combining a frequency region with the directivity patterns between adjacent radio base station stations.

5. A radio communication system, comprising:

At least one radio base station station configured to transmit and receive a radio signal by a directivity pattern and to select the directivity pattern having a peak in the same direction in each of two or more different frequency regions, and

the radio base station station being configured to switch the directivity pattern and transmit and receive a signal by a radio wave having the directivity pattern with a peak in the same direction in each of two or more different channels, each channel being a unit for setting a directivity pattern formed by a matrix of frequency region and time region, and between adjacent radio base transmission station stations, a signal to be transmitted or received with the two or more different channels each combined with the directivity patterns in different correspondence patterns.

6. The radio communication system as claimed in claim 5, further comprising:

a plurality of the radio base station stations combined as a set, each of the radio base station stations being configured to transmit or receive a signal by a radio wave having a directivity pattern having a peak in the same direction in each of two or more different frequencies, wherein

between different radio base station stations, a signal is transmitted or received in the two or more different frequencies each combined with the directivity patterns in different correspondence patterns, and

a set formed by at least seven adjacent radio base transmission station stations is cyclically repeated.

7. The radio communication system as claimed in claim 5, wherein an orthogonal code is used for generating a correspondence pattern for combining the frequency region with the directivity patterns between adjacent radio base station stations.