Power control circuit and radio transmission apparatus

• US 20030103577A1
• Filed: 03/28/2002
• Published: 06/05/2003
• Est. Priority Date: 11/30/2001
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Harada, Hiroshi, Nakano, Yoshikazu
• Granted Patent: US 7,336,751 B2
• Time in Patent Office: Days
• US Class Current: 375/295
• CPC Class Codes: H04W 52/282 taking into account the speed of the mobile
• CPC Class Codes: H04W 52/56 Detection of errors of TPC bits

Abstract

The invention relates to power control of a cellular mobile communication system using TPC, and a power control circuit in a base station set and a radio terminal is equipped with a synchronism detecting unit for detecting synchronism data indicating synchronism establishment from radio data every frame; a synchronism/asynchronism judging unit for judging synchronism/asynchronism based on the synchronism data, an execution/unexecution judging unit for judging execution/unexecution of TPC based on the synchronism data, TPC bits extracting unit for detecting TPC bits contained in the radio data, and a selection control unit for selecting execution/unexecution of transmission power control using the TPC bits based on the judged result and the judged result. 3-Stage control of suspension, execution and unexecution of TPC becomes feasible every frame on the basis of quality, more stable quality can be secured, and increase in the quantity of channel interference can be prevented.

Claims

1. A power control circuit comprising:

a synchronism detecting unit for detecting synchronism/asynchronism from radio data every frame;

a synchronism/asynchronism judging unit for judging synchronism/asynchronism on the basis of the detected result for every frame from the synchronism detecting unit;

an execution/unexecution judging unit for judging execution/unexecution of transmission power control on the basis of the detected result for every frame in the synchronism detecting unit;

a transmission power control information extracting unit for extracting transmission power control information contained in the radio data; and

a selection unit for selecting execution/unexecution of transmission power control using the transmission power control information extracted in the transmission power control information extracting unit on the basis of the judged result from the execution/unexecution judging unit.

7. The power control circuit according to claim 1, wherein the selection unit is so constituted that execution/unexecution of the transmission power control is controlled on the basis of respective states of a synchronism-established state indicating radio synchronism establishment, an asynchronous state indicating out-of-radio synchronism and a transient state between the synchronism-established state and the asynchronous state.

2. A power control circuit comprising:

a synchronism detecting unit for detecting synchronism/asynchronism from radio data received every frame;

a synchronism/asynchronism judging unit for outputting judgment data indicating synchronism/asynchronism by comparison between a number of times that the synchronism detecting unit has continuously detected synchronism or asynchronism and a prescribed threshold value T₁;

an execution/unexecution judging unit for outputting validity/invalidity data indicating execution/unexecution of transmission power control by comparison between a number of times that the synchronism detecting unit has continuously detected synchronism or asynchronism and a prescribed threshold value T₂(1≦

T₂<

T₁);

a transmission power control information extracting unit for extracting transmission power control information contained in the radio data; and

a selection unit for selecting execution/unexecution of transmission power control using the transmission power control information extracted in the transmission power control information extracting unit on the basis of the judgment data from the synchronism/asynchronism judging unit and the validity/invalidity data from the execution/unexecution judging unit.

3. A power control circuit comprising:

a synchronism detecting unit for detecting synchronism/asynchronism from radio data received every frame;

an asynchronism judging unit for outputting judgment data indicating asynchronism by comparison between a number of times that the synchronism detecting unit has continuously detected asynchronism and a prescribed threshold value SS1;

a transmission power control information extracting unit for extracting transmission power control information contained in the radio data; and

a control unit for setting a transmission power value at a time asynchronism has been first detected in the synchronism detecting unit as a transmission power value when the asynchronism judging unit has outputted the judgment data indicating the asynchronism.

8. The power control circuit according to claim 3, wherein the control unit is so constituted that execution/unexecution of the transmission power control is controlled on the basis of respective states of a synchronism-established state indicating radio synchronism establishment, an asynchronous state indicating out-of-radio synchronism and a transient state between the synchronism-established state and the asynchronous state.

10. The power control circuit according to claim 3, wherein the control unit is so constituted that a transmission power value held relating to a counter value provided in the synchronism/asynchronism judging unit is outputted as a transmission power value.

11. The power control circuit according to claim 3, wherein the synchronism/asynchronism judging unit is so constituted that a protective counter for forward protection or backward protection is used as the prescribed threshold value SS1.

4. A power control circuit comprising:

a synchronism detecting unit for detecting synchronism/asynchronism from radio data every frame;

a synchronism/asynchronism judging unit for judging synchronism/asynchronism on the basis of the synchronism/asynchronism detected every frame in the synchronism detecting unit;

a transmission power control information extracting unit for extracting transmission power control information contained in the radio data;

an operation unit for extracting a prescribed number of pilot data from the radio data every prescribed number of slots to output operation information as to an error;

an execution/unexecution judging unit for judging execution/unexecution of transmission power control on the basis of the operation information outputted from the operation unit; and

a selection unit for selecting execution/unexecution of transmission power control using the transmission power control information extracted in the transmission power control information extracting unit on the basis of a judged result from the execution/unexecution judging unit.

5. The power control circuit according to claim 4, wherein the operation unit is so constituted that a mobile calculation is made on the basis of the number of slots to output the operation information.

6. The power control circuit according to claim 4, wherein the synchronism/asynchronism judging unit is so constituted that a number of times that the synchronism detecting unit has continuously detected synchronism or asynchronism is counted to judge synchronism/asynchronism by comparison between a number of continuous times and the prescribed threshold value.

9. The power control circuit according to claim 4, wherein the selection unit is so constituted that execution/unexecution of the transmission power control is controlled on the basis of respective states of a synchronism-established state indicating radio synchronism establishment, an asynchronous state indicating out-of-radio synchronism and a transient state between the synchronism-established state and the asynchronous state.

12. A radio transmission apparatus comprising:

a transmitter unit for transmitting a first radio signal containing information data at a desired transmission power value; and

a power control circuit for controlling the transmission power value in the transmitter unit;

wherein the power control circuit comprises;

a synchronism detecting unit for detecting synchronism/asynchronism from radio data attributable to a second radio signal containing information data and transmission power control information transmitted by an opposite radio apparatus for radiocommunication every frame;

a synchronism/asynchronism judging unit for judging synchronism/asynchronism on the basis of a detected result for every frame from the synchronism detecting unit;

an execution/unexecution judging unit for judging execution/unexecution of transmission power control on the basis of the detected result for every frame in the synchronism detecting unit;

a transmission power control information extracting unit for extracting transmission power control information contained in the radio data; and

a selection unit for selecting execution/unexecution of transmission power control using the transmission power control information extracted in the transmission power control information extracting unit on the basis of a judged result from the execution/unexecution judging unit.

13. A radio transmission apparatus comprising:

a transmitter unit for transmitting a first radio signal containing information data at a desired transmission power value; and

a power control circuit for controlling the transmission power value in the transmitter unit;

wherein the power control circuit comprises;

a transmission power control information extracting unit for extracting transmission power control information contained in radio data attributable to a second radio signal containing information data transmitted by an opposite radio apparatus for radiocommunication;

a transmission power control information judging unit for judging execution/unexecution of transmission power control on the basis of the transmission power control information extracted in the transmission power control information extracting unit; and

a selection unit for selecting execution/unexecution of transmission power control on the basis of a judged result from the transmission power control information judging unit and transmission power value data corresponding to the judged result.

14. A radio transmission apparatus comprising:

a transmitter unit for transmitting a first radio signal containing information data at a desired transmission power value; and

a power control circuit for controlling the transmission power value in the transmitter unit;

wherein the power control circuit comprises;

a synchronism detecting unit for detecting synchronism/asynchronism from radio data attributable to a second radio signal containing information data and transmission power control information transmitted by an opposite radio apparatus for radiocommunication every frame;

a synchronism/asynchronism judging unit for judging synchronism/asynchronism on the basis of the synchronism/asynchronism detected every frame in the synchronism detecting unit;

a transmission power control information extracting unit for extracting transmission power control information contained in the radio data; and

a control unit for setting a transmission power value at the time the synchronism detecting unit has first detected asynchronism as a transmission power value when the synchronism/asynchronism judging unit has outputted judgment data indicating asynchronism.

15. A radio transmission apparatus comprising:

a transmitter unit for transmitting a first radio signal containing information data at a desired transmission power value; and

a power control circuit for controlling the transmission power value in the transmitter unit;

wherein the power control circuit comprises;

a synchronism detecting unit for detecting synchronism/asynchronism from radio data attributable to a second radio signal containing information data and transmission power control information transmitted by an opposite radio apparatus for radiocommunication every frame;

a synchronism/asynchronism judging unit for judging synchronism/asynchronism on the basis of the synchronism/asynchronism detected every frame in the synchronism detecting unit;

a transmission power control information extracting unit for extracting transmission power control information contained in the radio data;

an operation unit for extracting a prescribed number of pilot data from the radio data every prescribed number of slots to output operation information as to an error;

an execution/unexecution judging unit for judging execution/unexecution of transmission power control on the basis of the operation information outputted from the operation unit; and

a selection unit for selecting execution/unexecution of transmission power control using the transmission power control information extracted in the transmission power control information extracting unit on the basis of a judged result from the execution/unexecution judging unit.