Interface management in a wireless communication system using subframe time reuse

• US 8,848,619 B2
• Filed: 11/24/2008
• Issued: 09/30/2014
• Est. Priority Date: 11/27/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Nanda, Sanjiv, Tiedemann, Edward G., Yavuz, Mehmet
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): HYUN, SOON D
• Application Number:
  US12/276,882
• Publication Number:
  US 20090135796A1
• Time in Patent Office: 2,136 Days
• Field of Search: None
• US Class Current: 370/329
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/20 using error rate
• CPC Class Codes: H04W 52/244 Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
• CPC Class Codes: H04W 52/32 TPC of broadcast or control channels
• 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 52/38 TPC being performed in particular situations
• CPC Class Codes: H04W 52/44 in connection with interruption of transmission
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 56/0025 synchronizing potentially movable access points
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02

Abstract

Interference that occurs during wireless communication may be managed by subframe time reuse. A method, apparatus amend medium of communication determines interfering subframe gating sequences. The transmission gating in a home access point is adjusted by determining a first gating sequence from a first unplanned access point. A second gating sequence is selected based on the first gating sequence, wherein the first and second gating sequences are non-interfering. Signals are transmitted according to the second gating sequence from a second unplanned access point to an associated access terminal.

Claims

1. A method of communication, comprising:

determining a first gating sequence from a first unplanned access point, wherein a gating sequence is a pattern of gated on-off transmission periods, and wherein an unplanned access point is an access point that is deployed ad hoc or in an unplanned manner;

selecting a second gating sequence based on the first gating sequence, wherein the first and second gating sequences are non-interfering; and

transmitting signals according to the second gating sequence from a second unplanned access point to an associated access terminal.

2. The method of claim 1, further comprising establishing an active connection from the second unplanned access point to the associated access terminal.

3. The method of claim 2, wherein determining the first gating sequence further comprises:

transmitting a signal on all subframes of the active connection to the associated access terminal; and

receiving downlink power control feedback from the associated access terminal indicating interference of the signal on ones of the all subframes corresponding to the first gating sequence.

4. The method of claim 1, wherein selecting the second gating sequence comprises:

identifying a complementary sequence to the first gating sequence; and

selecting the second gating sequence from at least a portion of the complementary sequence.

5. The method of claim 1, wherein selecting the second gating sequence further comprises selecting the second gating sequence to minimize cross-correlation with the first gating sequence.

6. The method of claim 1, wherein selecting the second gating sequence further comprises selecting the second gating sequence to include shortened gated on and shortened gated off periods.

7. The method of claim 6, wherein selecting the second gating sequence further comprises selecting the second gating sequence to include alternating gated on and gated off periods.

8. The method of claim 1, wherein selecting the second gating sequence further comprises selecting the second gating sequence to include at least one of contiguous gated on subframes or contiguous gated off subframes.

9. An apparatus for communication, comprising:

an interference controller configured to determine a first gating sequence from a first unplanned access point and to select a second gating sequence based on the first gating sequence, wherein the first and second gating sequences are non-interfering, wherein a gating sequence is a pattern of gated on-off transmission periods, and wherein an unplanned access point is an access point that is deployed ad hoc or in an unplanned manner; and

a communication controller configured to transmit signals according to the second gating sequence from a second unplanned access point to an associated access terminal.

10. The apparatus of claim 9, wherein the communication controller is further configured to establish an active connection from the second unplanned access point to the associated access terminal.

11. The apparatus of claim 10, wherein the communication controller is further configured to transmit a signal on all subframes of the active connection to the associated access terminal and to receive downlink power control feedback from the associated access terminal indicating interference of the signal on ones of the all subframes corresponding to the first gating sequence.

12. The apparatus of claim 9, wherein the interference controller is further configured to identify a complementary sequence to the first gating sequence and to select the second gating sequence from at least a portion of the complementary sequence.

13. The apparatus of claim 9, wherein selecting the second gating sequence further comprises selecting the second gating sequence to minimize cross-correlation with the first gating sequence.

14. The apparatus of claim 9, wherein the interference controller is further configured to select the second gating sequence to include shortened gated on and shortened gated off periods.

15. The apparatus of claim 14, wherein the interference controller is further configured to select the second gating sequence to include alternating gated on and gated off periods.

16. The apparatus of claim 9, wherein the interference controller is further configured to select the second gating sequence to include at least one of contiguous gated on subframes or contiguous gated off subframes.

17. An apparatus for communication, comprising:

means for determining a first gating sequence from a first unplanned access point, wherein a eating sequence is a pattern of gated on-off transmission periods, and wherein an unplanned access point is an access point that is deployed ad hoc or in an unplanned manner;

means for selecting a second gating sequence based on the first gating sequence, wherein the first and second gating sequences are non-interfering; and

means for transmitting signals according to the second gating sequence from a second unplanned access point to an associated access terminal.

18. The apparatus of claim 17, further comprising means for establishing an active connection from the second unplanned access point to the associated access terminal.

19. The apparatus of claim 18, wherein the means for determining the first gating sequence further comprises:

means for transmitting a signal on all subframes of the active connection to the associated access terminal; and

means for receiving downlink power control feedback from the associated access terminal indicating interference of the signal on ones of the all subframes corresponding to the first gating sequence.

20. The apparatus of claim 17, wherein the means for selecting the second gating sequence comprises:

means for identifying a complementary sequence to the first gating sequence; and

means for selecting the second gating sequence from at least a portion of the complementary sequence.

21. The apparatus of claim 17, wherein the means for selecting the second gating sequence further comprises means for selecting the second gating sequence to minimize cross-correlation with the first gating sequence.

22. The apparatus of claim 17, wherein the means for selecting the second gating sequence further comprises means for selecting the second gating sequence to include shortened gated on and shortened gated off periods.

23. The apparatus of claim 22, wherein the means for selecting the second gating sequence further comprises means for selecting the second gating sequence to include alternating gated on and gated off periods.

24. The apparatus of claim 17, wherein the means for selecting the second gating sequence further comprises means for selecting the second gating sequence to include at least one of contiguous gated on subframes or contiguous gated off subframes.

25. A computer-program product, comprising:

a non-transitory computer-readable medium comprising codes for causing a computer to;

determine a first gating sequence from a first unplanned access point, wherein a gating sequence is a pattern of gated on-off transmission periods, and wherein an unplanned access point is an access point that is deployed ad hoc or in an unplanned manner;

select a second gating sequence based on the first gating sequence, wherein the first and second gating sequences are non-interfering; and

transmit signals according to the second gating sequence from a second unplanned access point to an associated access terminal.

26. The computer-program product of claim 25, further comprising codes for causing the computer to establish an active connection from the second unplanned access point to the associated access terminal.

27. The computer-program product of claim 26, wherein the codes for causing the computer to determine the first gating sequence further comprise codes for causing the computer to:

transmit a signal on all subframes of the active connection to the associated access terminal; and

receive downlink power control feedback from the associated access terminal indicating interference of the signal on ones of the all subframes corresponding to the first gating sequence.

28. The computer-program product of claim 25, wherein the codes for causing the computer to select the second gating sequence comprise codes for causing the computer to:

identify a complementary sequence to the first gating sequence; and

select the second gating sequence from at least a portion of the complementary sequence.

29. The computer-program product of claim 25, wherein the codes for causing the computer to select the second gating sequence further comprise codes for causing the computer to select the second gating sequence to minimize cross-correlation with the first gating sequence.

30. The computer-program product of claim 25, wherein the codes for causing the computer to select the second gating sequence further comprise codes for causing the computer to select the second gating sequence to include shortened gated on and shortened gated off periods.

31. The computer-program product of claim 30, wherein the codes for causing the computer to select the second gating sequence further comprise codes for causing the computer to select the second gating sequence to include alternating gated on and gated off periods.

32. The computer-program product of claim 25, wherein the codes for causing the computer to select the second gating sequence further comprise codes for causing the computer to select the second gating sequence to include at least one of contiguous gated on subframes or contiguous gated off subframes.