Method and apparatus for adaptive power control for spread-spectrum communications

• US 7,535,874 B2
• Filed: 11/12/2004
• Issued: 05/19/2009
• Est. Priority Date: 06/30/1995
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Lomp, Gary R., Ozluturk, Fatih, Kowalski, John
• Primary Examiner(s): Pham; Chi H.
• Assistant Examiner(s): MEW, KEVIN D
• Application Number:
  US10/988,410
• Publication Number:
  US 20050094604A1
• Time in Patent Office: 1,649 Days
• Field of Search: 370/335, 370/320, 370/442, 370/441, 370/247, 370/264, 370/276, 370/277, 370/304, 370/322, 370/324, 370/326, 370/328, 370/329, 370/341, 370/350, 370/395.62, 370/431, 370/464, 370/479, 370/503, 370/507, 370509-514, 370/100.1, 370/103, 370/105.4, 370/105.5, 370/106, 370/508, 370/105.2, 370/110.1, 370/522, 370/282, 370/519, 370/524, 370/206, 370/208, 370/209, 370/318, 370/342, 455/403, 455/407, 455/39, 455/500, 455/42, 455/524, 455/526, 455 60- 62, 455/56.1, 455/309, 455/312, 455/298, 455/205, 455/127.1
• US Class Current: 370/335
• CPC Class Codes: H03H 17/0226 comprising look-up tables
• CPC Class Codes: H03H 17/0254 Matched filters
• CPC Class Codes: H03H 17/06 Non-recursive filters
• CPC Class Codes: H03H 17/0607 comprising a ROM addressed by the input data signals
• CPC Class Codes: H03H 2218/06 Multiple-input, multiple-output [MIMO]; Multiple-input, single-output [MISO]
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7075 with code phase acquisition
• CPC Class Codes: H04B 1/70753 Partial phase search
• CPC Class Codes: H04B 1/70754 Setting of search window, i.e. range of code offsets to be searched H04B1/70758 takes precedence
• CPC Class Codes: H04B 1/70755 Setting of lock conditions, e.g. threshold
• CPC Class Codes: H04B 1/70758 Multimode search, i.e. using multiple search strategies
• CPC Class Codes: H04B 1/7077 Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
• CPC Class Codes: H04B 1/708 Parallel implementation
• CPC Class Codes: H04B 1/7085 using a code tracking loop, e.g. a delay-locked loop
• CPC Class Codes: H04B 1/7093 Matched filter type
• CPC Class Codes: H04B 1/7115 Constructive combining of multi-path signals, i.e. RAKE receivers
• CPC Class Codes: H04B 1/712 Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 2201/70702 Intercell-related aspects
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 2201/70707 : Efficiency-related aspects
• CPC Class Codes: H04B 2201/7071 : with dynamic control of receiver resources
• CPC Class Codes: H04B 7/2628 : using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence
• CPC Class Codes: H04B 7/2637 : for logical channel control
• CPC Class Codes: H04B 7/264 : for data rate control
• CPC Class Codes: H04J 13/00 : Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04J 13/004 : Orthogonal
• CPC Class Codes: H04J 13/0077 : Multicode, e.g. multiple codes assigned to one user
• CPC Class Codes: H04L 1/0059 : Convolutional codes
• CPC Class Codes: H04L 1/1692 : Physical properties of the supervisory signal, e.g. acknowledgement by energy bursts
• CPC Class Codes: H04L 2001/0094 : Bus
• CPC Class Codes: H04L 2027/003 : at baseband only
• CPC Class Codes: H04L 2027/0053 : Closed loops
• CPC Class Codes: H04L 25/0212 : of impulse response
• CPC Class Codes: H04L 27/206 : using a pair of orthogonal carriers, e.g. quadrature carriers
• CPC Class Codes: H04L 27/2332 : using a non-coherent carrier
• CPC Class Codes: H04L 5/1446 : of transmission speed
• CPC Class Codes: H04N 1/00912 : Arrangements for controlling a still picture apparatus or components thereof not otherwise provided for
• CPC Class Codes: H04N 1/3333 : during transmission, input or output of the picture signal; within a single document or page
• CPC Class Codes: H04N 2201/3335 : Speed or rate
• CPC Class Codes: H04W 52/08 : Closed loop power control
• CPC Class Codes: H04W 52/146 : Uplink power control
• CPC Class Codes: H04W 52/24 : using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/26 : using transmission rate or quality of service QoS [Quality of Service]
• CPC Class Codes: H04W 52/322 : Power control of broadcast channels
• CPC Class Codes: H04W 52/325 : Power control of control or pilot channels
• CPC Class Codes: H04W 52/343 : taking into account loading or congestion level
• 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 52/362 : Aspects of the step size
• CPC Class Codes: H04W 52/367 : Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/44 : in connection with interruption of transmission
• CPC Class Codes: H04W 52/50 : at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 52/52 : using AGC [Automatic Gain Control] circuits or amplifiers
• CPC Class Codes: H04W 52/54 : Signalisation aspects of the TPC commands, e.g. frame structure
• CPC Class Codes: H04W 52/60 : using different transmission rates for TPC commands

Abstract

A code division multiple access subscriber unit comprises an antenna configured to output a radio frequency signal, the radio frequency signal having a quadrature (Q) channel and an in-phase (I) channel. A circuit coupled to the antenna, the circuit being configured to generate power control bits which are carried by one of the I and Q channels and not the other one of the I and Q channels, the power control bits are spread coded and are adapted to control an output power of a base station. The radio frequency signal is a first radio frequency signal, the circuit is further configured to generate the power control bits based on a power level of a second radio frequency signal output by a base station and an interference level associated with the second radio frequency signal.

Claims

1. A code division multiple access subscriber unit comprising:

an antenna configured to output a first radio frequency signal, the first radio frequency signal having a quadrature (Q) channel and an in-phase (I) channel; and

a circuit coupled to the antenna, the circuit being configured to generate power control bits based on a power level of a second radio frequency signal received from a base station and an interference level associated with the second radio frequency signal, wherein the power control bits are carried by one of the I and Q channels and not the other one of the I and Q channels, and the power control bits are spread coded and adapted to control an output power of the base station.

2. A code division multiple access subscriber unit in accordance with claim 1, wherein the first radio frequency signal is modulated in accordance with a quadrature phase shift keying (QPSK) format.

3. A code division multiple access subscriber unit in accordance with claim 1, wherein said one of the I and Q channels carrying the power control bits further carries signaling information.

4. A code division multiple access subscriber unit in accordance with claim 3, wherein the signaling information is adapted to facilitate processing of signals received by the base station.

7. A code division multiple access subscriber unit in accordance with claim 1, wherein the power control bits are not error protected.

8. A code division multiple access subscriber unit in accordance with claim 1, wherein the power control bits are not forward error correction encoded.

25. A code division multiple access subscriber unit in accordance with claim 1, further comprising:

a controller circuit;

an encoder circuit;

a decoder circuit;

a modulator circuit;

a demodulator circuit; and

a memory circuit.

5. A code division multiple access subscriber unit comprising:

an antenna configured to output a first radio frequency signal, the first radio frequency signal having a quadrature (Q) channel and an in-phase (I) channel; and

a circuit coupled to the antenna, the circuit being configured to generate power control bits which are carried by one of the I and Q channels and not the other one of the I and Q channels, wherein the power control bits are spread coded and are adapted to control an output power of a base station; and

wherein the other one of the I and Q channels carries user data produced as a result of an input supplied to the code division multiple access subscriber unit.

6. A code division multiple access subscriber unit in accordance with claim 5, wherein the user data includes at least one of voice data and video data.

28. A code division multiple access subscriber unit in accordance with claim 5, further comprising:

a controller circuit;

an encoder circuit;

a decoder circuit;

a modulator circuit;

a demodulator circuit; and

a memory circuit.

30. A code division multiple access subscriber unit in accordance with claim 5, wherein the first radio frequency signal is modulated in accordance with a quadrature phase shift keying (QPSK) format.

31. A code division multiple access subscriber unit in accordance with claim 5, wherein said one of the I and Q channels carrying the power control bits further carries signaling information.

9. A code division multiple access subscriber unit, comprising:

an antenna configured to receive a first radio frequency signal; and

a circuit coupled to the antenna, the circuit configured to generate power control bits in response to the first radio frequency signal, wherein the power control bits are based on a power level of the first radio frequency signal and an interference level associated with the first radio frequency signal, the power control bits being adapted to control a power of a base station, the circuit being configured to spread code the power control bits and to generate an in-phase (I) channel and a quadrature (Q) channel, such that the spread coded power control bits are carried by one of the I and Q channels and not the other one of the I and Q channels,

wherein the I and Q channels are carried by a second radio frequency signal output by the code division multiple access subscriber unit.

10. A code division multiple access subscriber unit in accordance with claim 9, wherein the second radio frequency signal is modulated in accordance with a quadrature phase shift keying (QPSK) format.

11. A code division multiple access subscriber unit in accordance with claim 9, wherein said one of the I and Q channels carrying the power control bits further carries signaling information.

12. A code division multiple access subscriber unit in accordance with claim 11, wherein the signaling information is adapted to facilitate processing of signals by the base station.

15. A code division multiple access subscriber unit in accordance with claim 9, wherein the power control bits are not error protected.

16. A code division multiple access subscriber unit in accordance with claim 9, wherein the power control bits are not forward error correction encoded.

26. A code division multiple access subscriber unit in accordance with claim 9, further comprising:

a controller circuit;

an encoder circuit;

a decoder circuit;

a modulator circuit;

a demodulator circuit; and

a memory circuit.

13. A code division multiple access subscriber unit, comprising:

an antenna configured to receive a first radio frequency signal; and

a circuit coupled to the antenna, the circuit configured to generate power control bits in response to the first radio frequency signal, the power control bits being adapted to control a power of a base station, the circuit being configured to spread code the power control bits and to generate an in-phase (I) channel and a quadrature (Q) channel, such that the spread coded power control bits are carried by one of the I and Q channels and not the other one of the I and Q channels,

wherein the I and Q channels are carried by a second radio frequency signal output by the code division multiple access subscriber unit,

wherein the other one of the I and Q channels carries user data produced as a result of an input supplied to the code division multiple access subscriber unit.

14. A code division multiple access subscriber unit in accordance with claim 13, wherein the user data includes at least one of voice data and video data.

29. A code division multiple access subscriber unit in accordance with claim 13, further comprising:

a controller circuit;

an encoder circuit;

a decoder circuit;

a modulator circuit;

a demodulator circuit; and

a memory circuit.

33. A code division multiple access subscriber unit in accordance with claim 13, wherein the second radio frequency signal is modulated in accordance with a quadrature phase shift keying (QPSK) format.

34. A code division multiple access subscriber unit in accordance with claim 13, wherein said one of the I and Q channels carrying the power control bits further carries signaling information.

35. A code division multiple access subscriber unit in accordance with claim 34, wherein the signaling information is adapted to facilitate processing of signals received by the base station.

17. A communication method, comprising:

receiving a first radio frequency signal with a user antenna of a code division multiple access subscriber unit;

generating power control bits in response to the first radio frequency signal, the power control bits being adapted to control a power of a base station;

spread coding the power control bits;

modulating a second radio frequency signal to carry an in-phase (I) channel and a quadrature (Q) channel, wherein one of the I and Q channels carries the spread coded power control bits and the other one of the I and Q channels does not carry the power control bits; and

transmitting the second radio frequency signal,

wherein the generating the power control bits is based on a power level of the first radio frequency signal and a noise level associated with the first radio frequency signal.

18. A communication method in accordance with claim 17, wherein the modulating the second radio frequency signal is in accordance with a quadrature phase shifted keying (QPSK) format.

19. A communication method in accordance with claim 17, further comprising supplying signaling information to said one of the I and Q channels carrying the spread coded power control bits.

20. A communication method in accordance with claim 19, wherein the signaling information is adapted to facilitate processing of signals by the base station.

22. A communication method in accordance with claim 17, wherein the power control bits are not error protected.

23. A code division multiple access subscriber unit in accordance with claim 17, wherein the power control bits are not forward error correction encoded.

24. A method in accordance with claim 17, wherein the code division multiple access subscriber unit further comprises:

a controller circuit;

an encoder circuit;

a decoder circuit;

a modulator circuit;

a demodulator circuit; and

a memory circuit.

21. A communication method, comprising:

receiving a first radio frequency signal with a user antenna of a code division multiple access subscriber unit;

generating power control bits in response to the first radio frequency signal, the power control bits being adapted to control a power of a base station;

spread coding the power control bits;

modulating a second radio frequency signal to carry an in-phase (I) channel and a quadrature (Q) channel, wherein one of the I and Q channels carries the spread coded power control bits and the other one of the I and Q channels does not carry the power control bits;

transmitting the second radio frequency signal;

supplying signaling information to said one of the I and Q channels carrying the spread coded power control bits, wherein the signaling information is adapted to facilitate processing of signals by the base station;

receiving an input to the code division multiple access subscriber unit; and

supplying data based on the input to the other one of the I and Q channels.

27. A method in accordance with claim 21, wherein the code division multiple access subscriber unit further comprises:

a controller circuit;

an encoder circuit;

a decoder circuit;

a modulator circuit;

a demodulator circuit; and

a memory circuit.

32. A code division multiple access subscriber unit in accordance with claim 21, wherein the signaling information is adapted to facilitate processing of signals received by the base station.

36. A communication method in accordance with claim 21, wherein the second radio frequency signal is modulated in accordance with a quadrature phase shift keying (QPSK) format.

37. A communication method in accordance with claim 21, wherein said one of the I and Q channels carrying the power control bits further carries signaling information.

38. A communication method in accordance with claim 37, wherein the signaling information is adapted to facilitate processing of signals received by the base station.