Scheduling TDD-LTE measurement in TD-SCDMA systems

• US 8,948,126 B2
• Filed: 12/23/2010
• Issued: 02/03/2015
• Est. Priority Date: 12/23/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Chin, Tom, Shi, Guangming, Lee, Kuo-Chun
• Primary Examiner(s): Beharry, Noel
• Assistant Examiner(s): Combs, Joe
• Application Number:
  US12/977,546
• Publication Number:
  US 20120163198A1
• Time in Patent Office: 1,503 Days
• Field of Search: 370/280, 370/331
• US Class Current: 370/331
• CPC Class Codes: H04W 36/0088 Scheduling hand-off measurements
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface

Abstract

Certain aspects of the present disclosure propose techniques for performing a time division duplex-long term evolution (TDD-LTE) measurement in a time division synchronous code division multiple access (TD-SCDMA) system. Certain aspects provide a method that generally includes obtaining measurements of downlink (DL) transmission from a base station (BS) of a second radio access technology (RAT), maintaining uplink (UL) transmission with a BS of a first RAT while obtaining the measurements, and performing network acquisition operations with the BS of the second RAT based on the measurements.

Claims

1. A method for wireless communications, comprising:

tuning away from a first radio access technology (RAT) to a second RAT during a first downlink time slot of a subframe of the first RAT, a frame boundary of the first RAT being aligned with a frame boundary of the second RAT;

obtaining measurements of downlink (DL) transmission from the second RAT including acquiring a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH) of the second RAT;

tuning away from the second RAT to the first RAT before a transition from a last uplink time slot of the subframe of the first RAT to a second downlink time slot of the subframe of the first RAT; and

acquiring the second RAT based at least in part on the measurements.

2. The method of claim 1, wherein the first RAT comprises Time Division Synchronous Code Division Multiple Access (TD-SCDMA).

3. The method of claim 1, wherein the second RAT comprises Time Division Duplex Long Term Evolution (TDD-LTE).

4. The method of claim 1, wherein upon acquiring the PSS, the SSS, and the PBCH, measuring a reference signal received power (RSRP) and a reference signal received quality (RSRQ).

5. The method of claim 1, wherein the acquisition of the second RAT comprises a handover to a BS of the second RAT.

6. The method of claim 1, further comprising maintaining uplink (UL) communications with the first RAT while obtaining the measurements.

7. An apparatus for wireless communications, comprising:

means for tuning away from a first radio access technology (RAT) to a second RAT during a first downlink time slot of a subframe of the first RAT, a frame boundary of the first RAT being aligned with a frame boundary of the second RAT;

means for obtaining measurements of downlink (DL) transmission from the second RAT including means for acquiring a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH) of the second RAT;

means for tuning away from the second RAT to the first RAT before a transition from a last uplink time slot of the subframe of the first RAT to a second downlink time slot of the subframe of the first RAT; and

means for acquiring the second RAT based at least in part on the measurements.

8. The apparatus of claim 7, wherein the first RAT comprises Time Division Synchronous Code Division Multiple Access (TD-SCDMA).

9. The apparatus of claim 7, wherein the second RAT comprises Time Division Duplex Long Term Evolution (TDD-LTE).

10. The apparatus of claim 7, wherein upon acquiring the PSS, the SSS, and the PBCH, means for measuring a reference signal received power (RSRP) and a reference signal received quality (RSRQ).

11. The apparatus of claim 7, wherein the acquisition of the second RAT comprises a handover to a BS of the second RAT.

12. An apparatus for wireless communications, comprising:

at least one processor adapted to;

tune away from a first radio access technology (RAT) to a second RAT during a first downlink time slot of a subframe of the first RAT, a frame boundary of the first RAT being aligned with a frame boundary of the second RAT;

obtain measurements of downlink (DL) transmission from the second RAT including acquiring a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH) of the second RAT;

tune away from the second RAT to the first RAT before a transition from a last uplink time slot of the subframe of the first RAT to a second downlink time slot of the subframe of the first RAT; and

acquire the second RAT based at least in part on the measurements; and

a memory coupled to the at least one processor.

13. The apparatus of claim 12, in which the at least one processor is further adapted to maintain uplink (UL) communications with the first RAT while obtaining the measurements.

14. The apparatus of claim 12, wherein the first RAT comprises Time Division Synchronous Code Division Multiple Access (TD-SCDMA).

15. The apparatus of claim 12, wherein the second RAT comprises Time Division Duplex Long Term Evolution (TDD-LTE).

16. The apparatus of claim 12, wherein upon acquiring the PSS, the SSS, and the PBCH, the at least one processor is adapted to measure a reference signal received power (RSRP) and a reference signal received quality (RSRQ).

17. The apparatus of claim 12, wherein the acquisition of the second RAT comprises a handover to a BS of the second RAT.

18. A computer-program product, comprising:

a non-transitory computer-readable medium comprising code for;

tuning away from a first radio access technology (RAT) to a second RAT during a first downlink time slot of a subframe of the first RAT, a frame boundary of the first RAT being aligned with a frame boundary of the second RAT;

obtaining measurements of downlink (DL) transmission from the second RAT including acquiring a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH) of the second RAT;

tuning away from the second RAT to the first RAT before a transition from a last uplink time slot of the subframe of the first RAT to a second downlink time slot of the subframe of the first RAT; and

acquiring the second RAT based at least in part on the measurements.

19. The computer-program product of claim 18, wherein the first RAT comprises Time Division Synchronous Code Division Multiple Access (TD-SCDMA).

20. The computer-program product of claim 18, wherein the second RAT comprises Time Division Duplex Long Term Evolution (TDD-LTE).

21. The computer-program product of claim 18, wherein upon acquiring the PSS, the SSS, and the PBCH, code for measuring a reference signal received power (RSRP) and a reference signal received quality (RSRQ).

22. The computer-program product of claim 18, wherein the acquisition of the second RAT comprises a handover to a BS of the second RAT.

23. A method for wireless communications, comprising:

sending, from a base station (BS) of a first radio access technology (RAT), a command to a user equipment (UE), wherein the command instructs the UE to obtain measurements of downlink (DL) transmission from a BS of a second RAT including acquiring a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH) of the second RAT, a frame boundary of the first RAT being aligned with a frame boundary of the second RAT;

allowing the UE to tune away from the second RAT to the first RAT during a first downlink time slot of a subframe of the first RAT;

maintaining uplink (UL) transmission with the UE while the UE obtains the measurements; and

refraining from allocating traffic channels to the UE between a first downlink time slot of a subframe of the first RAT and a transition from a last uplink time slot of a subframe of the first RAT to a second downlink time slot of the subframe of the first RAT when the UE obtains measurements.

24. The method of claim 23, wherein the first RAT comprises Time Division Synchronous Code Division Multiple Access (TD-SCDMA).

25. The method of claim 23, wherein the second RAT comprises Time Division Duplex Long Term Evolution (TDD-LTE).

26. The method of claim 23, further comprising receiving a report of the measurements obtained by the UE to perform network acquisition operations of the UE to the BS of the second RAT.

27. The method of claim 26, wherein the network acquisition operations comprises a handover to the BS of the second RAT.

28. The method of claim 23, wherein the DL transmission from the BS of the second RAT is during the first time slot.

29. An apparatus for wireless communications, comprising:

means for sending, from a base station (BS) of a first radio access technology (RAT), a command to a user equipment (UE), wherein the command instructs the UE to obtain measurements of downlink (DL) transmission from a BS of a second RAT including acquiring a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH) of the second RAT, a frame boundary of the first RAT being aligned with a frame boundary of the second RAT;

means for maintaining uplink (UL) transmission with the UE while the UE obtains the measurements; and

means for refraining from allocating traffic channels to the UE between a first downlink time slot of a subframe of the first RAT and a transition from a last uplink time slot of a subframe of the first RAT to a second downlink time slot of the subframe of the first RAT when the UE obtains measurements.

30. The apparatus of claim 29, wherein the first RAT comprises Time Division Synchronous Code Division Multiple Access (TD-SCDMA).

31. The apparatus of claim 29, wherein the second RAT comprises Time Division Duplex Long Term Evolution (TDD-LTE).

32. The apparatus of claim 29, further comprising means for receiving a report of the measurements obtained by the UE to perform network acquisition operations of the UE to the BS of the second RAT.

33. The apparatus of claim 32, wherein the network acquisition operations comprises a handover to the BS of the second RAT.

34. The apparatus of claim 29, wherein the DL transmission from the BS of the second RAT is during the first time slot.

35. An apparatus for wireless communications, comprising:

at least one processor adapted to;

send, from a base station (BS) of a first radio access technology (RAT), a command to a user equipment (UE), wherein the command instructs the UE to obtain measurements of downlink (DL) transmission from a BS of a second RAT including acquiring a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH) of the second RAT, a frame boundary of the first RAT being aligned with a frame boundary of the second RAT;

maintain uplink (UL) transmission with the UE while the UE obtains the measurements;

refrain from allocating traffic channels to the UE between a first downlink time slot of a subframe of the first RAT and a transition from a last uplink time slot of a subframe of the first RAT to a second downlink time slot of the subframe of the first RAT when the UE obtains measurements; and

a memory coupled to the at least one processor.

36. The apparatus of claim 35, wherein the first RAT comprises Time Division Synchronous Code Division Multiple Access (TD-SCDMA).

37. The apparatus of claim 35, wherein the second RAT comprises Time Division Duplex Long Term Evolution (TDD-LTE).

38. The apparatus of claim 35, wherein the at least one processor is adapted to receive a report of the measurements obtained by the UE to perform network acquisition operations of the UE to the BS of the second RAT.

39. The apparatus of claim 38, wherein the network acquisition operations comprises a handover to the BS of the second RAT.

40. The apparatus of claim 35, wherein the DL transmission from the BS of the second RAT is during the first time slot.

41. A computer-program product, comprising:

a non-transitory computer-readable medium comprising code for;

sending, from a base station (BS) of a first radio access technology (RAT), a command to a user equipment (UE), wherein the command instructs the UE to obtain measurements of downlink (DL) transmission from a BS of a second RAT including acquiring a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH) of the second RAT, a frame boundary of the first RAT being aligned with a frame boundary of the second RAT;

maintaining uplink (UL) transmission with the UE while the UE obtains the measurements; and

refraining from allocating traffic channels to the UE between a first downlink time slot of a subframe of the first RAT and a transition from a last uplink time slot of a subframe of the first RAT to a second downlink time slot of the subframe of the first RAT when the UE obtains measurements.

42. The computer-program product of claim 41, wherein the first RAT comprises Time Division Synchronous Code Division Multiple Access (TD-SCDMA).

43. The computer-program product of claim 41, wherein the second RAT comprises Time Division Duplex Long Term Evolution (TDD-LTE).

44. The computer-program product of claim 41, further comprising code for receiving a report of the measurements obtained by the UE to perform network acquisition operations of the UE to the BS of the second RAT.

45. The computer-program product of claim 44, wherein the network acquisition operations comprises a handover to the BS of the second RAT.

46. The computer-program product of claim 41, wherein the DL transmission from the BS of the second RAT is during the first time slot.