Base station apparatus and radio communication method

• US 20030189917A1
• Filed: 12/18/2002
• Published: 10/09/2003
• Est. Priority Date: 04/19/2001
• Status: Active Grant

• Current Assignee: III Holdings 12, LLC (Intellectual Ventures LLC)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Sudo, Hiroaki
• Granted Patent: US 7,876,716 B2
• Time in Patent Office: Days
• US Class Current: 370/347
• CPC Class Codes: H04B 7/0817 with multiple receivers and antenna path selection
• CPC Class Codes: H04B 7/0857 using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity
• CPC Class Codes: H04W 52/58 Format of the TPC bits
• CPC Class Codes: H04W 74/02 Hybrid access
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A base station (10) performs bi-directional radio communications with terminal station apparatuses using communication frames each having time slots and being composed of a first region with a predetermined open-loop period and a second region with an open-loop period shorter than the open-loop period of the first region. A level detecting section (21) detects a received level of an uplink slot configured in the second region. A transmission diversity section (14) performs diversity transmission on a downlink transmission signal assigned to a downlink slot corresponding to the uplink slot, corresponding to a result of detection of the received level. It is thereby possible to enhance the effect of improving the received quality due to transmission diversity without degrading the transmission efficiency.

Claims

1. A base station apparatus that performs bi-directional radio communications with terminal station apparatuses using communication frames each having time slots and being composed of a first region with a predetermined open-loop period and a second region with an open-loop period shorter than the open-loop period of the first region.

2. The base station apparatus according to claim 1, comprising:

a section that detects a received level of an uplink slot configured in the second region; and

a diversity section that performs diversity transmission on a downlink transmission signal assigned to a downlink slot corresponding to the uplink slot, corresponding to a result of detection of the received level.

3. The base station apparatus according to claim 2, wherein the second region is disposed between downlink slots and uplink slots contained in the first region.

4. The base station apparatus according to claim 1, wherein uplink slots are configured in a region from the beginning to the center in the second region, while downlink slots are configured in a region from the center to the end in the second region.

5. The base station apparatus according to claim 4, wherein in the second region, a guard interval is provided between the region in which the uplink slots are configured and the region in which the downlink slots are configured.

6. The base station apparatus according to claim 1, further comprising:

a section that assigns a transmission signal with a high priority to a downlink slot contained in the second region,

wherein the diversity section performs diversity transmission on the transmission signal with a high priority, corresponding to a result of detection of a received level of an uplink slot corresponding to the downlink slot assigned the transmission signal with a high priority.

7. The base station apparatus according to claim 1, wherein a target downlink slot contained in the first region is configured at the beginning of the first region, while a target uplink slot corresponding to the target downlink slot is configured at the end of a frame.

8. The base station apparatus according to claim 1, further comprising:

a section that controls transmission power of a downlink transmission signal assigned to a downlink slot corresponding to an uplink slot, corresponding to a result of detection of a received level of the uplink slot.

9. The base station apparatus according to claim 1, further comprising:

a spreading section that performs spreading on a downlink transmission signal, and thereby assigns each of subcarriers composing the downlink transmission signal to spreading chips.

10. The base station apparatus according to claim 1, wherein a downlink transmission signal is an OFDM signal obtained by performing IFFT on a transmission signal.

11. A radio communication method for performing bi-directional radio communications with terminal station apparatuses using communication frames each having time slots and being composed of a first region with a predetermined open-loop period and a second region with an open-loop period shorter than the open-loop period of the first region, the method comprising:

a step of detecting a received level of an uplink slot configured in the second region; and

a diversity step of performing diversity transmission on a downlink transmission signal assigned to a downlink slot corresponding to the uplink slot, corresponding to a result of detection of the received level.