Interface management in wireless communication system using hybrid time reuse

• US 8,867,456 B2
• Filed: 11/24/2008
• Issued: 10/21/2014
• Est. Priority Date: 11/27/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Yavuz, Mehmet, Black, Peter J., Nanda, Sanjiv
• Primary Examiner(s): Wong, Warner
• Application Number:
  US12/276,932
• Publication Number:
  US 20090135790A1
• Time in Patent Office: 2,157 Days
• Field of Search: 370/314, 370/321, 370/328, 370/336, 370/338, 370/345, 370/395.4, 370/442, 370/458, 370464-465, 370/468, 370/498
• 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 hybrid time reuse. A method, apparatus amend medium of communication determines one or more time reuse patterns of respective one or more unplanned access points. A second time reuse pattern that is less interfering with the one or more time reuse patterns is selected. Signals are transmitted according to the second time reuse pattern from a second unplanned access point to an associated access terminal.

Claims

1. A method of communication, comprising:

determining one or more time reuse patterns of respective one or more unplanned access points;

selecting a second time reuse pattern that is less interfering with the one or more time reuse patterns, wherein the second time reuse pattern corresponds to a Hybrid Automatic Repeat Request (HARQ) interlace of secondary synchronization channel offsets of a macro cell; and

transmitting signals according to the second time reuse pattern from a second unplanned access point to an associated access terminal.

2. The method of claim 1, wherein determining one or more time reuse patterns comprises establishing time synchronization at the second unplanned access point with a macro cell.

3. The method of claim 2, wherein:

establishing time synchronization comprises measuring secondary synchronization channel offsets used by the macro cell and the one or more unplanned access points; and

selecting a second time reuse pattern comprises identifying a HARQ interlace from the secondary synchronization channel offsets that exhibits the least interference, and identifying a preferred slot offset from the identified HARQ interlace.

4. The method of claim 3, further comprising identifying a primary femto channel based at least in part on the preferred slot offset.

5. The method of claim 4, wherein transmitting signals comprises transmitting signals on the primary femto channel from the second unplanned access point to an associated access terminal.

6. The method of claim 3, wherein transmitting signals comprises transmitting information identifying the secondary synchronization channel offsets to the associated access terminal.

7. The method of claim 1, further comprising transmitting on pilot channels corresponding to the one or more time reuse patterns.

8. An apparatus for communication, comprising:

an interference controller configured to determine one or more time reuse patterns of respective one or more unplanned access points and to select a second time reuse pattern that is less interfering with the one or more time reuse patterns, wherein the second time reuse pattern corresponds to a HARQ interlace of secondary synchronization channel offsets of a macro cell; and

a communication controller configured to transmit signals according to the second time reuse pattern from a second unplanned access point to an associated access terminal.

9. The apparatus of claim 8, wherein determining one or more time reuse patterns comprises establishing time synchronization at the second unplanned access point with a macro cell.

10. The apparatus of claim 9, wherein:

establishing time synchronization comprises measuring secondary synchronization channel offsets used by the macro cell and the one or more unplanned access points; and

selecting a second time reuse pattern comprises identifying a HARQ interlace from the secondary synchronization channel offsets that exhibits the least interference, and identifying a preferred slot offset from the identified HARQ interlace.

11. The apparatus of claim 10 wherein the interference controller is further configured to identify a primary femto channel based at least in part on the preferred slot offset.

12. The apparatus of claim 11, wherein transmitting signals comprises transmitting signals on the primary femto channel from the second unplanned access point to an associated access terminal.

13. The apparatus of claim 10, wherein transmitting signals comprises transmitting information identifying the secondary synchronization channel offsets to the associated access terminal.

14. The apparatus of claim 8, wherein the communication controller is further configured to transmit on pilot channels corresponding to the one or more time reuse patterns.

15. An apparatus for communication, comprising:

means for determining one or more time reuse patterns of respective one or more unplanned access points;

means for selecting a second time reuse pattern that is less interfering with the one or more time reuse patterns, wherein the second time reuse pattern corresponds to a HARQ interlace of secondary synchronization channel offsets of a macro cell; and

means for transmitting signals according to the second time reuse pattern from a second unplanned access point to an associated access terminal.

16. The apparatus of claim 15, wherein the means for determining one or more time reuse patterns comprises means for establishing time synchronization at the second unplanned access point with a macro cell.

17. The apparatus of claim 16, wherein:

the means for establishing time synchronization comprises means for measuring secondary synchronization channel offsets used by the macro cell and the one or more unplanned access points; and

the means for selecting a second time reuse pattern comprises means for identifying a HARQ interlace from the secondary synchronization channel offsets that exhibits the least interference, and means for identifying a preferred slot offset from the identified HARQ interlace.

18. The apparatus of claim 17, further comprising means for identifying a primary femto channel based at least in part on the preferred slot offset.

19. The apparatus of claim 18, wherein the means for transmitting signals comprises means for transmitting signals on the primary femto channel from the second unplanned access point to an associated access terminal.

20. The apparatus of claim 17, wherein the means for transmitting signals comprises means for transmitting information identifying the secondary synchronization channel offsets to the associated access terminal.

21. The apparatus of claim 15, further comprising means for transmitting on pilot channels corresponding to the one or more time reuse patterns.

22. A computer-program product, comprising:

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

determine one or more time reuse patterns of respective one or more unplanned access points;

select a second time reuse pattern that is less interfering with the one or more time reuse patterns, wherein the second time reuse pattern corresponds to a HARQ interlace of secondary synchronization channel offsets of a macro cell; and

transmit signals according to the second time reuse pattern from a second unplanned access point to an associated access terminal.

23. The computer-program product of claim 22, wherein the codes for causing the computer to determine one or more time reuse patterns comprise codes for causing the computer to establish time synchronization at the second unplanned access point with a macro cell.

24. The computer-program product of claim 23, wherein:

the codes for causing the computer to establish time synchronization comprise codes for causing the computer to measure secondary synchronization channel offsets used by the macro cell and the one or more unplanned access points; and

the codes for causing the computer to select a second time reuse pattern comprise codes for causing the computer to identify a HARQ interlace from the secondary synchronization channel offsets that exhibits the least interference, and identify a preferred slot offset from the identified HARQ interlace.

25. The computer-program product of claim 24, further comprising codes for causing the computer to identify a primary femto channel based at least in part on the preferred slot offset.

26. The computer-program product of claim 25, wherein the codes for causing the computer to transmit signals comprise codes for causing the computer to transmit signals on the primary femto channel from the second unplanned access point to an associated access terminal.

27. The computer-program product of claim 24, wherein the codes for causing the computer to transmit signals further comprise codes for causing the computer to transmit information to identify the secondary synchronization channel offsets to the associated access terminal.

28. The computer-program product of claim 22, further comprising codes for causing the computer to transmit on pilot channels corresponding to the one or more time reuse patterns.