Method of adjusting a signal quality target to be reached in power control procedures in a CDMA radio communication network and a corresponding transceiver

• US 6,963,553 B1
• Filed: 05/17/2000
• Issued: 11/08/2005
• Est. Priority Date: 02/21/2000
• Status: Expired due to Term

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Alcatel SA (Nokia Corporation)
• Inventors: Roux, Pierre, Cordier, Christophe, Bourgoin, Cédric, De Hoz Garcia-Bellido, Alejandro
• Primary Examiner(s): Phan, Man U.
• Application Number:
  US09/572,461
• Time in Patent Office: 2,001 Days
• Field of Search: 370335-391, 370/522, 375205-225, 375/239, 375259-296, 455425-453, 455522-525
• US Class Current: 370/342
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/225 Calculation of statistics, e.g. average, variance
• CPC Class Codes: H04W 52/26 using transmission rate or quality of service QoS [Quality of Service]

Abstract

A method of adjusting a signal quality target at a transceiver of a CDMA radio communication network. The adjustment of the signal quality target ensures that a predefined frame quality target is reached in power control procedure. According to the invention, the method consists in computing for a received frame, a frame quality indicator depending on signal quality indicators measured at slot level in the received frame. The method further comprises a step of adjusting the signal quality target according to the difference between the frame quality indicator and the predefined frame quality target.

Claims

1. A method of adjusting a signal quality target at a transceiver of a code division multiple access (CDMA) radio communication network, said transceiver receiving a signal carrying a frame structure, each frame being divided into slots, said signal quality target ensuring that a predefined frame quality target is reached in power control procedures, said method comprising:

computing for a received frame, a frame quality indicator depending on signal quality indicators measured slot by slot in said received frame; and

adjusting said signal quality target according to the difference between said frame quality indicator and said predefined frame quality target;

wherein said frame quality indicator depends on variations of said signal quality indicators measured slot-by-slot in said received frame, said variations being represented by a value related to a standard deviation of said signal quality indicators measured slot-by-slot in said received frame.

2. The method according to claim 1, wherein said frame quality indicator further depends on an average value of slot quality indicators before decoding, each slot quality indicator before decoding being derived from one of said signal quality indicators measured slot-by-slot in said frame based on a predefined non linear relation.

3. The method according to claim 2, wherein the relation between said frame quality indicator and said average value of said slot quality indicators before decoding is a polynomial whose coefficients are parameterized by said value related to a standard deviation of said signal quality indicators measured slot-by-slot in said received frame.

4. The method according to claim 1, wherein said frame is chosen as large as an interleaving period.

5. A transceiver part of a code division multiple access (CDMA) radio communication network, said transceiver receiving a signal carrying a frame structure, each frame being divided in slots, characterized in that said transceiver comprises:

a signal quality estimator to measure signal quality indicators at slot level in a frame;

a first filter to calculate an average value of slot quality indicators before decoding derived from said signal quality indicators measured at slot level by using a predefined non-linear relation; and

a second filter to calculate a value related to variations of said signal quality indicators measured at slot level in said frame.

6. The transceiver according to claim 5, wherein said transceiver further comprises:

a curve selection module to select one relation out of a set of predefined relations parameterized by said value related to variations of said signal quality indicators measured at slot level in said frame;

a frame quality estimator to evaluate a frame quality indicator for said frame; and

an adjustment estimator to adjust a signal quality target according to the difference between said frame quality indicator and a predefined frame quality target.

7. The transceiver according to claim 5, wherein said transceiver is a mobile station of a CDMA radio communication network.

8. The transceiver according to claim 5, wherein said transceiver is a fixed station of a CDMA radio communication network.

9. A radio network controller part of a code division multiple access (CDMA) radio communication network, said radio network controller adjusting a signal quality target to ensure a predefined target frame quality, characterized in that said radio network controller comprises:

an input receiver to receive a parameter corresponding to a variation of a signal quality indicator in a frame;

a curve selection module to select one relation out of a set of predefined relations parameterized by said value related to variations of said signal quality indicators measured at slot level in said frame;

a frame quality estimator to evaluate a frame quality indicator for said frame; and

an adjustment estimator to adjust said signal quality target according to the difference between said frame quality indicator and said predefined frame quality target.

10. A transceiver of a code division multiple access (CDMA) radio communication network, said transceiver receiving a signal carrying a frame structure, each frame being divided into slots, said transceiver comprising:

a signal quality estimator configured to detect a frame quality indicator based on a signal quality indicator measured slot by slot in a received frame; and

an adjustment estimator configured to adjust a signal quality target based on a difference between the frame quality indicator and a predetermined frame quality target;

wherein the frame quality indicator depends on variations of the signal quality indicator measured slot-by-slot in the received frame, the variations being represented by a value related to a standard deviation of the signal quality indicator measured slot-by-slot in the received frame.

11. The transceiver of claim 10, wherein the frame quality indicator further depends on an average value of slot quality indicators before decoding, each slot quality indicator before decoding being derived from the signal quality indicator measured slot-by-slot in the frame based on a predefined non linear relation.

12. The transceiver of claim 11, wherein the relation between the frame quality indicator and the average value of the slot quality indicators before decoding is a polynomial, the coefficients of the polynomial being parameterized by a value related to a standard deviation of the signal quality indicator measured slot-by-slot in the received frame.

13. The transceiver of claim 10, wherein the frame is selected to be as large as an interleaving period.