Reducing interference with a multiple format channel in a communication system

• US 8,155,689 B2
• Filed: 05/26/2010
• Issued: 04/10/2012
• Est. Priority Date: 07/29/2002
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Butala, Amit
• Primary Examiner(s): Dean, Raymond S
• Application Number:
  US12/788,251
• Publication Number:
  US 20110009152A1
• Time in Patent Office: 685 Days
• Field of Search: 455/69, 455/522, 455/63.1, 455/67.13, 455/127.1, 455/127.2, 370/318
• 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 minimum 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 for transmitting a signal including at least one frame, comprising:

a variable power level transmitter configured to transmit the signal at various power levels; and

a processor for;

increasing by interference power levels each of a plurality of determined minimum power levels for respectively transmitting a plurality of portions of the frame if there will be deterministic interference from the transmitter resulting from the transmission of the respective portion of the frame.

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

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

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

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

6. 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.

7. The apparatus of claim 1, wherein at least one of the minimum power levels and the interference power levels are updated in accordance with a closed-loop power control mechanism.

8. 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.

9. A method for transmitting a signal including at least one frame, comprising:

increasing by interference power levels each of a plurality of determined minimum power levels for respectively transmitting a plurality of portions of the frame if there will be deterministic interference from the transmitter resulting from the transmission of the respective portion of the frame; and

transmitting the frame in accordance with the determined minimum power level.

10. The method of claim 9, wherein the minimum power levels are updated in accordance with a closed loop power control mechanism.

11. The method of claim 9, wherein the minimum power increase is computed based on a spreading factor associated with the channel.

12. The method of claim 9, wherein the minimum power levels are computed based on the geometry of a wireless communication device receiving the transmitted signal.

13. The method of claim 9, 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.

14. The method of claim 13, wherein the minimum power level for an interfered with channel is selected from the interference power levels stored in the table.

15. The method of claim 13, 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.

16. An apparatus for wireless communication, comprising:

means for increasing by interference power levels each of a plurality of determined minimum power levels for respectively transmitting a plurality of portions of the frame if there will be deterministic interference from the transmitter resulting from the transmission of the respective portion of the frame; and

means for transmitting the frame in accordance with the determined minimum power level.

17. The apparatus of claim 16, further comprising means for selecting one or more of the interference power levels stored in a table.

18. The apparatus of claim 16, wherein the minimum power increase is computed based on a spreading factor associated with the channel.

19. The apparatus of claim 16, wherein the minimum power levels are computed based on the geometry of a wireless communication device receiving the transmitted signal.

20. The apparatus of claim 16, 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.