Transmitter-receiver, and method for controlling transmission power of the same

• US 6,603,980 B1
• Filed: 04/20/2000
• Issued: 08/05/2003
• Est. Priority Date: 08/28/1998
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Kasapidis, Makis, Uesugi, Mitsuru, Miya, Kazuyuki, Kitagawa, Keiichi
• Primary Examiner(s): Trost, William
• Assistant Examiner(s): D AGOSTA, STEPHEN M
• Application Number:
  US09/529,871
• Time in Patent Office: 1,202 Days
• Field of Search: 370/318, 455/522, 455/127, 375/140, 375/141, 375/142, 375/143
• US Class Current: 455/522
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/223 predicting future states of the transmission
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/288 taking into account the usage mode, e.g. hands-free, data transmission, telephone
• CPC Class Codes: H04W 52/36 with a discrete range or set of values, e.g. step size, ramping or offsets
• CPC Class Codes: H04W 52/44 in connection with interruption of transmission
• CPC Class Codes: H04W 52/54 Signalisation aspects of the TPC commands, e.g. frame structure

Abstract

Received quality detecting section 108 detects a received quality, bit determining section 111 determines whether a TPC bit is 0 or 1, amplitude reading section 112 reads a ratio of an amplitude of a signal other than the TPC bit and an amplitude of the TPC bit, accumulating section 113 determines an increase or decrease of transmit power and an amount of the increase and decrease of the transmit power using a symbol of the TPC bit for the increase or decrease, and an amplitude ratio for the amount of the increase and decrease to instruct to transmission amplifier 104, and multiplying section 114 multiplies the amplitude of the signal other than the TPC bit by a correction value corresponding to the received quality to determine the amplitude of the TPC bit.

Claims

1. A transmission/reception apparatus comprising:

detecting means for detecting a received quality of a received signal;

reading means for reading a symbol and an amplitude of a TPC bit in the received signal;

control means for multiplexing the TPC bit with a transmission signal and setting an amplitude of said transmission signal for each bit; and

transmitting means for transmitting said transmission signal with the amplitude set in said control means,

wherein said control means comprises symbol setting means for setting the symbol of the TPC bit;

TPC bit amplitude setting means for setting the amplitude of the TPC bit; and

general amplitude setting means for setting the amplitude of a bit other than the TPC bit in the transmission signal, and

wherein said symbol setting means sets the symbol using an output from said difference calculating means, and said TPC bit amplitude setting means sets the amplitude using an output from said ratio calculation means.

2. A transmission/reception apparatus comprising:

detecting means for detecting a received quality of a received signal;

reading means for reading a symbol and an amplitude of a TPC bit in the received signal;

control means for multiplexing the TPC bit with a transmission signal and setting an amplitude of said transmission signal for each bit; and

transmitting means for transmitting said transmission signal with the amplitude set in said control means,

wherein said general amplitude setting means obtains an increase or decrease amount from an output from said amplitude reading means, and sets, as the amplitude of a signal other than the TPC bit, a value obtained by adding or subtracting said increase or decrease amount to or from an amplitude at a previous transmission time based on an output from said symbol determining means, and said TPC bit amplitude setting means sets, as the amplitude of the TPC bit, a value obtained by multiplying the amplitude of the signal other than the TPC bit by an amount from said ratio determining means.

3. A transmission/reception apparatus comprising:

detecting means for detecting a received quality of a received signal;

reading means for reading a symbol and an amplitude of a TPC bit in the received signal;

control means for multiplexing the TPC bit with a transmission signal and setting an amplitude of said transmission signal for each bit; and

transmitting means for transmitting said transmission signal with the amplitude set in said control means,

wherein said detecting means comprises measuring means for measuring a SIR of the received signal;

storage means for storing a reference SIR;

difference calculating means for calculating a difference between a measured SIR and the reference SIR; and

ratio calculating means for obtaining a ratio of the measured SIR and the reference SIR,

wherein said ratio calculating means converts a calculated ratio into an increasing function to output, and

wherein said ratio calculating means converts the calculated ratio into the increasing function by a calculation using a log and a square root.

4. A transmission/reception apparatus comprising:

recognizing means for recognizing a compressed mode for decreasing a spreading factor of a signal;

reading means for reading a symbol and an amplitude of a transmit power control signal in a received signal; and

transmit power control means for performing transmit power control for the compressed mode at the time of the compressed mode, while performing transmit power control based on the symbol and the amplitude of said transmit power control signal at the time the compressed mode is cancelled.

5. The transmission/reception apparatus according to claim 4, wherein said transmit power control means comprises amplitude before pause interval control means for, at the time of the compressed mode, increasing a transmit power value in a predetermined period before a pause interval by a predetermined amount or predetermined ratio.

6. The transmission/reception apparatus according to claim 4, wherein said transmit power control means further comprises excess amplitude setting means for, at the time of the compressed mode, setting a target value in the transmit power control in a predetermined period after the pause interval at a value higher than a required transmit power value.

7. The transmission/reception apparatus according to claim 4, wherein said transmit power control means further comprises amplitude after pause interval setting means for, at the time of the compressed mode, setting a value obtained by adding an offset value to a transmit power value obtained immediately before the pause interval starts, as a transmit power value at the time transmission and reception restart after the pause interval, and offset setting means for predicting a transmit power value to be required immediately after the pause interval is finished, and setting a difference between a predicted value and the transmit power value obtained immediately before the pause interval starts as said offset value.

8. The transmission/reception apparatus according to claim 7, wherein said offset setting means determines the predicted value using the number of symbols of TPC bits obtained before the pause interval or an increase or decrease amount thereof as a reference.

9. The transmission/reception apparatus according to claim 4, further comprising:

chip interleaving means for subjecting spread transmission data to chip interleaving processing; and

chip deinterleaving means for subjecting received data to deinterleaving processing for each chip.

10. A transmit power control method comprising:

detecting step of detecting a received quality of a received signal;

reading step of reading a symbol and an amplitude of a TPC bit in the received signal;

control step of multiplexing the TPC bit with a transmission signal and setting an amplitude of said transmission signal for each bit; and

transmitting step of transmitting said transmission signal with the amplitude set in said control step,

wherein said control step comprises a symbol setting step of setting the symbol of the TPC bit in the transmission symbol;

a TPC bit amplitude setting step of setting the amplitude of the TPC bit in the transmission signal; and

a general amplitude setting step of setting the amplitude of a bit other than the TPC bit in the transmission signal, and

wherein said symbol setting step comprises the step of setting the symbol using an output in said difference calculating step, and said TPC bit amplitude setting step comprises the step of setting the amplitude using an output from said ratio calculation step.

11. A transmit power control method comprising:

detecting step of detecting a received quality of a received signal;

reading step of reading a symbol and an amplitude of a TPC bit in the received signal;

control step of multiplexing the TPC bit with a transmission signal and setting an amplitude of said transmission signal for each bit; and

transmitting step of transmitting said transmission signal with the amplitude set in said control step,

wherein said control step comprises a symbol setting step of setting the symbol of the TPC bit in the transmission symbol;

a TPC bit amplitude setting step of setting the amplitude of the TPC bit in the transmission signal; and

a general amplitude setting step of setting the amplitude of a bit other than the TPC bit in the transmission signal, and

wherein said general amplitude setting step comprises the steps of obtaining an increase or decrease amount from an output in said amplitude reading step;

setting, as the amplitude of the signal other than the TPC bit, a value obtained by adding or subtracting said increase or decrease amount to or from an amplitude at a previous transmission time based on an output in said symbol determining step; and

setting, as the amplitude of the TPC bit, a value obtained by multiplying the amplitude of the signal other than the TPC bit by an amount in said ratio determining step.

12. The transmit power control method comprising the steps of:

performing transmit power control for a compressed mode at the time of the compressed mode for decreasing a spreading factor of a signal; and

performing transmit power control based on a symbol and an amplitude of a transmit power control signal at the time the compressed mode is cancelled.

13. The transmit power control method according to claim 12, further comprising the step of, at the time of the compressed mode, increasing a transmit power value in a predetermined period before a pause interval by a predetermined amount or predetermined ratio.

14. The transmit power control method according to claim 12, further comprising the step of, at the time of the compressed mode, setting a target value in the transmit power control in a predetermined period after the pause interval at a value higher than a required transmit power value.

15. The transmit power control method according to claim 12, further comprising the step of:

predicting a transmit power value to be required immediately after the pause interval is finished, at the time of the compressed mode;

setting a difference between a predicted value and a transmit power value obtained immediately before the pause interval starts, as said offset value; and

setting a value obtained by adding said offset value to the transmit power value obtained immediately before the pause interval starts, as a transmit power value at the time transmission and reception restart after the pause interval.

16. The transmit power control method according to claim 15, further comprising the step of determining the predicted value using the number of symbols of TPC bits obtained before the pause interval or an increase or decrease amount thereof as a reference.

17. The transmit power control method according to claim 12, further comprising the steps of:

subjecting spread transmission data to chip interleaving processing; and

subjecting received data to deinterleaving processing for each chip.

18. A transmission/reception apparatus, comprising:

a detector that detects a received quality of a received signal;

a reader that reads a symbol of a transmit power control bit and a ratio of an amplitude of a signal other than the transmit power control bit to an amplitude of the transmit power control bit in the received signal;

a transmit power controller that determines whether to increase or decrease a transmit power based on said symbol and determines an amount of the increase or decrease based on said amplitude ratio;

a transmit power control bit generator that generates a generated transmit power control bit based on the received quality;

a controller that multiplexes the generated transmit power control bit on a transmission signal and sets an amplitude of said transmission signal on a per bit basis; and

a transmitter that transmits said transmission signal with said amplitude set in said controller.

19. The transmission/reception apparatus according to claim 18, wherein said detector further comprises:

a measurer that measures an SIR of the received signal;

a storage that stores a reference SIR;

a difference calculator that calculates a difference of the measured SIR and the reference SIR; and

a ratio calculator that calculates and obtains a ratio of the measured SIR and the reference SIR.

22. The transmission/reception-apparatus according to claim 18, wherein said reader further comprises:

a symbol determiner that reads the symbol of the received transmit power control bit; and

an amplitude reader that reads the ratio of the amplitude of the received transmit power control bit and the amplitude of the signal other than said received transmit power control bit.

25. The transmission/reception apparatus according to claim 19, further comprising a limiter that sets a limit on an output from said ratio calculator.

27. The transmission/reception apparatus according to claim 22, further comprising a limiter that sets a limit on an output from said amplitude reader.

28. The transmission/reception apparatus according to claim 19, wherein said ratio calculator converts the obtained ratio into an increasing function and outputs said increasing function.

29. The transmission/reception apparatus according to claim 28, wherein said ratio calculator converts the obtained ratio into the increasing function through a calculation using a log function and a square root function.

20. The transmission/reception apparatus according to claim wherein said controller further comprises:

a symbol setter that sets the symbol of the generated transmit power control bit;

a transmit power control bit amplitude setter that sets the amplitude of the generated transmit power control bit; and

a general amplitude setter that sets the amplitude of other bits than the generated transmit power control bit in the transmission signal.

21. The transmission/reception apparatus according to claim 20, wherein:

said symbol setter sets the symbol based on a difference of an SIR of the received signal and a reference SIR; and

said transmit power control bit amplitude setter sets the amplitude of the generated transmit power control bit based on a ratio of the SIR of the received signal and the reference SIR.

23. The transmission/reception apparatus according to claim 20, wherein:

said general amplitude setter obtains an amount of increase or decrease based on the ratio of the amplitude of the received transmit power control bit and the amplitude of the signal other than said received transmit power control bit and sets the amplitude of the signal other than the generated transmit power control bit with a value obtained by adding or subtracting said amount of the increase or decrease to or from an amplitude at a previous transmission time based on a prior received transmit power control bit; and

said transmit power control bit amplitude setter sets the amplitude of the generated transmit power control bit with a value obtained by multiplying the amplitude of the signal other than the generated transmit power control bit by a ratio of the SIR of the received signal and a reference SIR.

24. The transmission/reception apparatus according to claim 20, further comprising a limiter that sets a limit on an output from said transmit power control bit amplitude setter.

26. The transmission/reception apparatus according to claim 20, further comprising a limiter that sets a limit on an output from said general amplitude setter.

30. A transmission/reception apparatus, comprising:

a recognizer that recognizes a compressed mode in which a spreading factor of a signal is reduced;

a reader that reads a symbol of a transmit power control bit and a ratio of an amplitude of a signal other than the transmit power control bit to an amplitude of the transmit power control bit in a received signal; and

a transmit power controller that performs, at the time of the compressed mode, a transmit power control for the compressed mode, and that determines, when the compressed mode is cancelled, to increase or decrease a transmit power value based on the symbol and determines an amount of the increase or decrease based on the amplitude ratio.

31. The transmission/reception apparatus according to claim 30, wherein said transmit power controller further comprises an amplitude before pause interval controller that at the time of the compressed mode, increases a transmit power value of a predetermined period before a pause interval by a predetermined amount or a predetermined ratio.

32. The transmission/reception apparatus according to claim 30, wherein said transmit power controller further comprises an excess amplitude setter that, at the time of the compressed mode, sets a target value in the transmit power control of a predetermined period after a pause interval, said target value set higher than a required transmit power value.

33. The transmission/reception apparatus according to claim 30, wherein said transmit power controller further comprises:

an amplitude after pause interval setter that, at the time of the compressed mode, adds an offset value to the transmit power value obtained immediately before a pause interval and sets a transmit power value for a time that transmission and reception resume after the pause interval; and

an offset setter that predicts the transmit power value that will be required immediately after the pause interval and sets the offset value with a difference of a prediction value and the transmit power value immediately before the pause interval.

34. The transmission/reception apparatus according to claim 33, wherein said offset setter determines the prediction value based on a reference, said reference being a number of symbols of the received transmit power control bit received before the pause interval or the amount of the increase or decrease.

35. The transmission/reception apparatus according to claim 30, further comprising:

a chip interleaver that performs a chip interleaving processing to spread transmission data; and

a chip deinterleaver that performs a deinterleaving processing to received data on a per chip basis.

36. A communication terminal apparatus comprising a transmission/reception apparatus, the communication terminal apparatus comprising:

a detector that detects a received quality of a received signal;

a reader that reads a symbol of a transmit power control bit and a ratio of an amplitude of a signal other than the transmit power control bit to an amplitude of the transmit power control bit in the received signal;

a transmit power controller that determines whether to increase or decrease a transmit power based on said symbol and determines an amount of the increase or decrease based on said amplitude ratio;

a transmit power control bit generator that generates a generated transmit power control bit based on said received quality;

a controller that multiplexes the generated transmit power control bit on a transmission signal and sets an amplitude of said transmission signal on a per bit basis; and

a transmitter that transmits said transmission signal with the amplitude set in said controller.

37. A base station apparatus comprising a transmission/reception apparatus, said base station apparatus comprising:

a detector that detects a received quality of a received signal;

a reader that reads a symbol of a transmit power control bit and a ratio of an amplitude of a signal other than the transmit power control bit to an amplitude of the transmit power control bit in the received signal;

a transmit power controller that determines whether to increase or decrease a transmit power based on said symbol and determines an amount of the increase or decrease based on said amplitude ratio;

a transmit power control bit generator that generates a generated transmit power control bit based on the received quality;

a controller that multiplexes the generated transmit power control bit on a transmission signal and sets an amplitude of said transmission signal on a per bit basis; and

a transmitter that transmits said transmission signal with the amplitude set in said controller.

38. A transmit power control method, comprising:

detecting a received quality of a received signal;

reading a symbol of a transmit power control bit and a ratio of an amplitude of a signal other than the transmit power control bit to an amplitude of the transmit power control bit in the received signal;

performing a transmit power control for determining whether to increase or decrease a transmit power based on said symbol and determines an amount of the increase or decrease based on said amplitude ratio;

generating a generated transmit power control bit based on the received quality;

performing a control for multiplexing the generated transmit power control bit on a transmission signal and setting an amplitude of said transmission signal on a per bit basis; and

transmitting said transmission signal with the amplitude in said control step.

39. The transmit power control method according to claim 38, wherein the detection further comprises:

measuring an SIR of the received signal to calculate and obtain a difference of the measured SIR and a pre-stored reference SIR; and

obtaining a ratio of the measured SIR and the reference SIR.

40. The transmit power control method according to claim 38, wherein said control step further comprises:

setting a symbol of the generated transmit power control bit in the transmission signal;

setting an amplitude of said generated transmit power control bit in said transmission signal; and

setting an amplitude of other bits than said generated transmit power control bit in said transmission signal.

41. The transmit power control method according to claim 40, wherein:

the symbol of said generated transmit power control bit is set based on a difference of an SIR of the received signal and a reference SIR; and

the amplitude of the generated transmit power control bit is set based on a ratio of the SIR of the received signal and the reference SIR.

42. The transmit power control method according to claim 40, further comprising setting an amplitude of other bits than the generated transmit power control bit in the transmission signal by:

obtaining the amount of the increase or decrease base on the ratio of the amplitude of the received transmit power control bit and the amplitude of the signal other than the received transmit power control bit;

setting the amplitude of the signal other than the generated transmit power control bit by adding or subtracting said amount of the increase or decrease to or from an amplitude at a previous transmission time base on a prior received transmit power control bit; and

setting the amplitude of the generated transmit power control bit with a value obtained by multiplying the amplitude of the signal other than the generated transmit power control bit by a ratio of an SIR of the received signal and a reference SIR.

43. A transmit power control method, comprising:

performing, at a time of a compressed mode in which a spreading factor of a signal is reduced, a transmit power control for the compressed mode; and

determining, when the compressed mode is cancelled, to increase or decrease a transmit power based on a symbol of a received transmit power control bit, and determining an amount of the increase or decrease based on an amplitude of the received transmit power control bit.

44. The transmit power control method according to claim 43, further comprising, at the time of the compressed mode, increasing a transmit power value of a predetermined period before a pause interval by a predetermined amount or a predetermined ratio.

45. The transmit power control method according to claim 43, further comprising, at the time of the compressed mode, setting a target value in the transmit power control of a predetermined period after a pause interval, said target value set higher than a required transmit power value.

46. The transmit power control method according to claim 43, further comprising:

predicting, at the time of the compressed mode a transmit power value that will be required immediately after a pause interval;

setting an offset value with a difference of the predicted transmit power value and a transmit power value immediately before the pause interval; and

setting a transmit power value for the time that transmission and reception resume after the pause interval with a value obtained by adding the offset value to the transmit power value obtained immediately before the pause interval.

47. The transmit power control method according to claim 46, further comprising determining the prediction value based on a reference, said reference being a number of received transmit power control bit symbols received before the pause interval or being the amount of the increase or decrease.

48. The transmit power control method according to claim 43, further comprising:

performing a chip interleaving processing to spread transmission data; and

performing a deinterleaving processing to received data on a per chip basis.