Reducing interference with a multiple format channel in a communication system

• US 7,751,843 B2
• Filed: 07/29/2002
• Issued: 07/06/2010
• Est. Priority Date: 07/29/2002
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Butala, Amit
• Primary Examiner(s): Dean; Raymond S
• Application Number:
  US10/209,163
• Publication Number:
  US 20040203987A1
• Time in Patent Office: 2,899 Days
• Field of Search: 455/63.1, 455/67.13, 455/69, 455/522, 455/127.1, 455/127.2, 370/317, 370/318, 370/503
• US Class Current: 455/522
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/223 predicting future states of the transmission
• CPC Class Codes: H04W 52/226 using past references to control power, e.g. look-up-table
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range

Abstract

Techniques for reducing interference with a multiple format channel in a communication system are disclosed. In one aspect, a minimum power level is determined for each format transmitted during a transmission interval. The minumum power level for formats that will experience the interference are increased to compensate. The power level selected for transmission during the transmission interval is the most stringent of the minimum power levels. Various other aspects are also presented. These aspects have the benefit of mitigating the effects of a known interfering signal, while avoiding unnecessarily increasing transmit power, thus reducing the interference to other users and increasing system capacity.

Claims

1. An apparatus being operable with a signal comprising at least one frame, comprising:

a variable power level transmitter, for transmitting the signal at various power levels in response to a power level signal; and

a processor for;

determining a plurality of minimum power levels of the transmitter required for respectively transmitting a plurality of portions of the frame,

increasing each of the minimum power levels if there will be deterministic interference from the transmitter resulting from the transmission of the respective portion of the frame;

selecting the highest power level of the plurality of minimum power levels after any increments, wherein the increments are based on interference power levels; and

generating the power level signal in accordance with the highest power level.

2. The apparatus of claim 1, further comprising a table for storing the interference power levels.

3. The apparatus of claim 2, wherein the table further stores the minimum power levels.

4. The apparatus of claim 1, wherein the interference power levels are pre-determined.

5. The apparatus of claim 1, further comprising a receiver for receiving power level information generated in response to the transmitted signal.

6. The apparatus of claim 5, wherein the power level information comprises one or more minimum power levels.

7. The apparatus of claim 5, wherein the power level information comprises one or more interference power levels.

8. The apparatus of claim 1, wherein the interference power levels are determined in response to varying geometry between two wireless communication devices.

9. The apparatus of claim 1, wherein the minimum power levels are increased by adding at least one of the interference power levels to a base minimum power level.

10. The apparatus of claim 9, wherein the base minimum power is power controlled.

11. The apparatus of claim 9, wherein the base minimum power is comprised of a format dependent offset added to a normalized power level.

12. The apparatus of claim 11, wherein the normalized power level is determined in accordance with a closed-loop power control mechanism.

13. The apparatus of claim 1, wherein the minimum power levels are updated in accordance with a closed-loop power control mechanism.

14. The apparatus of claim 1, wherein the interference power levels are updated in accordance with a closed-loop power control mechanism.

15. The apparatus of claim 1, wherein the minimum power levels are increased by selecting at least one of the interference power levels.

16. The apparatus of claim 1, wherein at least one of the interference power levels are comprised of a format dependent offset added to a normalized power level.

30. The apparatus of claim 1, wherein at least one of the increments is based on known time and duration of the deterministic interference with the respective portion.

17. A base station being operable with a signal comprising at least one frame, comprising:

an antenna;

a variable power level transmitter, for transmitting via the antenna the signal at various power levels in response to a power level signal; and

a processor for;

determining a plurality of minimum power levels of the transmitter required for respectively transmitting a plurality of portions of the frame;

increasing each of the minimum power levels if there will be deterministic interference from the transmitter resulting from the transmission of the respective portion of the frame;

selecting the highest power level of the plurality of minimum power levels after any increments; and

generating the power level signal in accordance with the highest power level.

31. The device of claim 17, wherein at least one of the increments is based on known time and duration of the deterministic interference with the respective portion.

18. A method of reducing interference associated with transmitting at least one frame, comprising:

determining a plurality of minimum power levels of a transmitter required for respectively transmitting a plurality of portions of the frame;

increasing each of the minimum power levels if there will be deterministic interference from the transmitter resulting from the transmission of the respective portion of the frame;

selecting the largest of the minimum power levels as a transmit power level after any increments, wherein the increments are based on interference power levels; and

transmitting the frame in accordance with the transmit power level.

19. The method of claim 18, wherein the minimum power levels are updated in accordance with a closed loop power control mechanism.

20. The method of claim 18, wherein the minimum power increase is computed based on a spreading factor associated with the channel.

21. The method of claim 18, wherein the minimum power levels are computed based on the geometry of a wireless communication device receiving the transmitted signal.

22. The method of claim 18, wherein the portions are associated with at least one format and the minimum power levels required for each of the at least one format are determined by selecting a power level associated with that format from a power level table.

23. The method of claim 22, wherein the minimum power level for an interfered with channel is selected from the interference power levels stored in the table.

24. The method of claim 22, wherein the minimum power level for an interfered with channel is determined by selecting a non-interference power level stored in the table, selecting an interference offset stored in the table, and adding the offset to the non-interference power level to produce the minimum power level for the interfered with channel.

29. The method of claim 18, wherein the minimum power level is determined in part based upon a target Block Error Rate (BLER).

25. An apparatus for wireless communication, comprising:

means for determining a plurality of minimum power levels of a transmitter required for respectively transmitting a plurality of portions of a frame;

means for increasing each of the minimum power levels if there will be deterministic interference from the transmitter resulting from the transmission of the respective portion of the frame;

means for selecting the largest of the minimum power levels as a transmit power level after any increments, wherein the increments are based on interference power levels; and

a transmitter for transmitting the frame in accordance with the transmit power level.

26. The apparatus of claim 25, further comprising means for selecting one or more of the interference power levels stored in a table.

27. Computer-readable media including computer-executable instructions for performing the steps of:

determining a plurality of minimum power levels of a transmitter required for respectively transmitting a plurality of portions of a frame;

increasing each of the minimum power levels if there will be deterministic interference from the transmitter resulting from the transmission of the respective portion of the frame;

selecting the largest of the minimum power levels as a transmit power level after any increments, wherein the increments are based on interference power levels; and

transmitting the frame in accordance with the transmit power level.

28. The computer-readable media of claim 27, further including computer-executable instructions for performing the step of selecting one or more of the interference power levels stored in a table.