Mobile radio communication apparatus capable of reducing power dissipation

• US 6,256,510 B1
• Filed: 09/02/1998
• Issued: 07/03/2001
• Est. Priority Date: 09/02/1997
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Muraoka, Shinya
• Primary Examiner(s): Vo, Nguyen T.
• Assistant Examiner(s): MEHRPOUR, NAGHMEH
• Application Number:
  US09/145,453
• Time in Patent Office: 1,035 Days
• Field of Search: 455/78, 455/575, 455/127, 455/343, 455/522, 455/574, 455/69
• US Class Current: 455/522
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level
• CPC Class Codes: H04W 52/346 distributing total power among users or channels

Abstract

In a mobile radio communication apparatus, including a transmission circuit for intermittently transmitting first significant signals and a reception circuit for receiving second significant signals, a control circuit changes a strength of the first significant signals in accordance with a strength of the second significant signals only when the second significant signals are being received by the reception circuit.

Claims

1. A mobile radio communication apparatus comprising:

a transmission circuit for intermittently transmitting first significant signals;

a reception circuit for receiving second significant signals; and

a control circuit, connected between said reception circuit and said transmission circuit, for changing a strength of said first significant signals in accordance with a strength of said second significant signals only when said second significant signals are being received by said reception circuit.

2. The apparatus as set forth in claim 1, wherein each of said first and second significant signals has a first special signal at a header and a second special signal at a trailer,

said reception circuit including

a pattern detection circuit for detecting said first and second special signals in said second significant signals and generating a first control signal from a timing when said first special signal is detected to a timing when said second special signal is detected,

said control circuit including:

a power calculation circuit, connected to said reception circuit, for calculating a strength of said second significant signals; and

an amplification calculation circuit, connected to said pattern detection circuit and said power calculation circuit, for calculating an amplification factor in accordance with the strength of said second significant signals only when said first control signal is being generated,

said transmission circuit including an amplifier circuit, connected to said amplification calculation circuit, for adjusting the strength of said first significant signals using said amplification factor.

3. The apparatus as set forth in claim 2, wherein said control circuit further comprises:

a delay circuit, connected to said power calculation circuit, for delaying the strength of said second significant signals;

a reception state determination circuit, connected to said pattern detection circuit, said power calculation circuit and said delay circuit, for generating a second control signal for stopping transmission of said first significant signals when a difference between the strength of said second significant signals and the delayed strength of said second significant signals becomes larger than a first determined value and said first control signal is generated,

said second control signal being supplied to said amplifier circuit, so that said amplifier circuit is turned OFF.

4. The apparatus as set forth in claim 3, wherein said reception state determination circuit stores the delayed strength of said second significant signals when the difference between the strength of said second significant signals and the delayed strength of said second significant signals becomes larger than said first predetermined value,

said reception state determination circuit stops generation of said second control signal when a difference between the delayed strength of said second significant signals and the stored strength of said second significant signals becomes smaller than a second predetermined value and the difference between the strength of said second significant signals and the delayed strength of said second significant signals becomes smaller than a third predetermined value.

5. The apparatus as set forth in claim 1, wherein said control circuit stops transmission of said first significant signals when the strength of said second significant signals is decreased by an amount larger than a predetermined value.

6. The apparatus as set forth in claim 5, wherein said control circuit restarts the transmission of said first significant signals when the strength of said second significant signals is restored.

7. The apparatus as set forth in claim 5, further comprising:

an alarm generation circuit for generating an alarm signal;

a switch circuit, connected to said alarm generation circuit and said control circuit, for passing said alarm signal when said control circuit stops the transmission of said first significant signals;

an adder circuit, connected to said switch circuit and said reception circuit, for adding said alarm signal to said second significant signals.

8. The apparatus as set forth in claim 5, further comprising:

an alarm generation circuit for generating an alarm signal;

a switch circuit, connected to said alarm generation circuit and said reception state determination circuit, for passing said alarm signal when said reception state determination circuit generates said second control signal;

an adder circuit, connected to said switch circuit and said reception circuit, for adding said alarm signal to said second significant signals.

9. A mobile radio communication apparatus comprising:

a transmission circuit for intermittently transmitting first significant signals;

a reception circuit for receiving second significant signals;

a control circuit, connected between said reception circuit and said transmission circuit, for stopping transmission of said first significant signals when the strength of said second significant signals is decreased by an amount larger than a predetermined value;

an alarm generation circuit for generating an alarm signal when said decrease by said amount is larger than said predetermined value;

a switch circuit, connected to said alarm generation circuit and said control circuit, for passing said alarm signal when said control circuit stops the transmission of said first significant signals; and

an adder circuit, connected to said switch circuit and said reception circuit, for adding said alarm signal to said second significant signals.

10. A mobile radio communication apparatus comprising:

a transmission circuit for intermittently transmitting first significant signals;

a reception circuit for receiving second significant signals; and

a control circuit, connected between said reception circuit and said transmission circuit, for stopping transmission of said first significant signals when the strength of said second significant signals is decreased by an amount larger than a predetermined value,

wherein each of said first and second significant signals has a first special signal at a header and a second special signal at a trailer, said reception circuit including a pattern detection circuit for detesting said first and second special signals in said second significant signals and generating a first control signal from a timing when said first special signal is detected to a timing when said second special signal is detected,

wherein said control circuit comprises;

a power calculation circuit, connected to said reception circuit, for calculating a strength of said second significant signals;

a delay circuit, connected to said power calculation circuit, for delaying the strength of said second significant signals; and

a reception state determination circuit connected to said pattern detection circuit, said power calculation circuit and said delay circuit, for generating a second control signal for stopping transmission of said first significant signals when a difference between the strength of said second significant signals and the delayed strength of said second significant signals becomes larger than a first predetermined value and said first control signal is generated, said second control signal being supplied to said amplifier circuit, so that said amplifier circuit is turned OFF.

11. The apparatus as set forth in claim 10, wherein said reception state determination circuit stores the delayed strength of said second significant signals when the difference between the strength of said second significant signals and the delayed strength of said second significant signals becomes larger than said first predetermined value,

said reception state determination circuit stops generation of said second control signal when a difference between the delayed strength of said second significant signals and the stored strength of said second significant signals becomes smaller than a second predetermined value and the difference between the strength of said second significant signals and the delayed strength of said second significant signals becomes smaller than a third predetermined value.

12. The apparatus as set forth in claim 10, further comprising:

an alarm generation circuit for generating an alarm signal;

a switch circuit, connected to said alarm generation circuit and said reception state determination circuit, for passing said alarm signal when said reception state determination circuit generates said second control signal;

an adder circuit, connected to said switch circuit and said reception circuit, for adding said alarm signal to said second significant signals.

13. A mobile radio communication apparatus comprising:

means for calculating a strength of a received signal;

means for detecting a first special signal at a header of said received signal and a second special signal at a trailer of said received signal to generate a first control signal from a timing when said first special signal is detected to a timing when said second special signal is detected;

means for calculating an amplification factor in accordance with the strength of said received signal when said first control signal is being received; and

means for adjusting a strength of a transmitting signal in accordance with said amplification factor.

14. The apparatus as set forth in claim 13, further comprising:

means for delaying the strength of said received signal;

means for determining whether or not a difference between the strength of said received signal and the delayed strength of said received signal is larger than a predetermined value when said first control signal is being generated;

means for generating a second control signal when the difference between the strength of said received signal and the delayed strength of said received signal is larger than said first predetermined value; and

means for stopping transmission of said transmitting signal when said second control signal is being generated.

15. The apparatus as set forth in claim 14, further comprising:

means for storing the delayed strength of said received signal when the difference between the strength of said received signal and the delayed strength of said received signal is larger than said first predetermined value;

means for determining whether or not a difference between the delayed strength of said received signal and the stored strength of said received signal is smaller than a second predetermined value when said first control signal is being generated;

means for determining whether or not the difference between the strength of said received signal and the delayed strength of said received signal is smaller than a third predetermined value when said first control signal is being generated; and

means for stopping generation of said second control signal when the difference between the delayed strength of said received signal and the stored strength of said received signal is smaller than said second predetermined value and the difference between the strength of said received signal and the delayed strength of said received signal is smaller than said third predetermined value.

16. The apparatus as set forth in claim 13, further comprising means for adding an alarm signal to said received signal when said second control signal is being generated.

17. A mobile radio communication apparatus comprising:

means for calculating a strength of a received signal;

means for detecting a first special signal at a header of said received signal and a second special signal at a trailer of said received signal to generate a first control signal from a timing when said first special signal is detected to a timing when said second special signal is detected;

means for delaying the strength of said received signal;

means for determining whether or not a difference between the strength of said received signal and the delayed strength of said received signal is larger than a predetermined value when said first control signal is being generated;

means for generating a second control signal when the difference between the strength of said received signal and the delayed strength of said received signal is larger than said first predetermined value; and

means for stopping transmission of said transmitting signal when said second control signal is being generated.

18. The apparatus as set forth in claim 17, further comprising:

means for storing the delayed strength of said received signal when the difference between the strength of said received signal and the delayed strength of said received signal is larger than said first predetermined value;

means for determining whether or not a difference between the delayed strength of said received signal and the stored strength of said received signal is smaller than a second predetermined value when said first control signal is being generated;

means for determining whether or not the difference between the strength of said received signal and the delayed strength of said received signal is smaller than a third predetermined value when said first control signal is being generated; and

means for stopping generation of said second control signal when the difference between the delayed strength of said received signal and the stored strength of said received signal is smaller than said second predetermined value and the difference between the strength of said received signal and the delayed strength of said received signal is smaller than said third predetermined value.

19. The apparatus as set forth in claim 17, further comprising means for adding an alarm signal to said received signal when said second control signal is being generated.