Common control channel uplink power control for adaptive modulation and coding techniques

• US 6,615,054 B2
• Filed: 04/17/2002
• Issued: 09/02/2003
• Est. Priority Date: 05/14/2001
• Status: Expired due to Term

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Zeira, Eldad, Dick, Stephen G., Terry, Stephen E., Miller, James M., Zeira, Ariela
• Primary Examiner(s): VO, NGUYEN THANH
• Application Number:
  US10/124,001
• Publication Number:
  US 20020168995A1
• Time in Patent Office: 503 Days
• Field of Search: 455/522, 455/69, 455/422, 455/517, 455/63.1, 455/67.11, 455/67.13, 370/310, 370/342
• US Class Current: 455/522
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/246 where the output power of a terminal is based on a path parameter calculated in said terminal
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/26 using transmission rate or quality of service QoS [Quality of Service]
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The present invention is a user equipment (UE) which receives a communication signal over a physical reference channel using a reference channel receiver. An expected path loss is calculated using a path loss calculation device in response to the received communication signal. A signaling receiver receives an allocation of an uplink control channel including the amount of interference in the channel. Then, a power level calculation device, responsive to the path loss calculation device and the signaling receiver, determines an uplink power level based on the path loss and the interference level, whereby an uplink control channel transmission is initiated having the power level determined by the power level calculation device.

Claims

1. A user equipment (UE), comprising:

a reference channel receiver for receiving a communication signal over a physical reference channel;

a path loss calculation device, responsive to the received communication signal, for calculating an expected path loss;

a signaling receiver for receiving an allocation of an uplink control channel including the amount of interference in the channel; and

a power level calculation device, responsive to said path loss calculation device and said signaling receiver, for determining an uplink power level based on said path loss and said interference level;

whereby an uplink control channel transmission is initiated having the power level determined by said power level calculation device.

2. The UE of claim 1 wherein said reference channel receiver performs an estimate of the received communication for data detection and generates a power level of the communication signal;

and

said path loss calculation device uses said power level to calculate said expected path loss.

3. The UE of claim 1 wherein said allocation of said uplink channel includes a quality margin, whereby said quality margin is also used to determine said uplink power level.

4. The UE of claim 3 whereby said interference level and said quality margin are encoded into a single parameter.

5. The UE of claim 3 wherein the quality margin includes a signal to interference ratio target that said uplink control channel transmission is expected to achieve.

6. The UE of claim 3 wherein a quality margin of a previously received communication signal is used by said power level calculation device if a quality margin is omitted from a presently received communication signal.

7. A user equipment (UE), comprising:

a means for receiving a communication signal over a physical reference channel;

a means for calculating an expected path loss in response to the received communication signal;

means for receiving an allocation of an uplink control channel including the amount of interference in the channel; and

a means for determining an uplink power level based on said path loss and said interference level in response to said path loss calculation device and said signaling receiver;

whereby an uplink control channel transmission is initiated having the power level determined by said means for determining.

8. The UE of claim 7 wherein said means for receiving the communication signal performs an estimate of the received communication for data detection and generates a power level of the communication signal;

and

said means for calculating the path loss uses said power level to calculate said expected path loss.

9. The UE of claim 7 wherein said allocation of said uplink channel includes a quality margin, whereby said quality margin is also used to determine said uplink power level.

10. The UE of claim 9 whereby said interference level and said quality margin are encoded into a single parameter.

11. The UE of claim 9 wherein the quality margin includes a signal to interference ratio target that said uplink control channel transmission is expected to achieve.

12. The UE of claim 9 wherein a quality margin of a previously received communication signal is used by said means for determining if a quality margin is omitted from a presently received communication signal.