RECEIVE DIVERSITY CONTROL IN TD-SCDMA

• US 20140133319A1
• Filed: 11/13/2012
• Published: 05/15/2014
• Est. Priority Date: 11/13/2012
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Chen, Jinghu, Shen, Qiang, Hou, Jilei, Zhao, Wanlun, Kang, Insung
• Application Number:
  US13/675,460
• Publication Number:
  US 20140133319A1
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/0877 switching off a diversity branch, e.g. to save power
• CPC Class Codes: H04W 76/25 Maintenance of established connections

Abstract

In a TD-SCDMA user equipment (UE) with multiple receive chains, receive diversity may be implemented where multiple receive chains may simultaneously activate to perform reception on downlink signals. Receive diversity may be enabled when single chain reception provides undesired results and when receive diversity will not impact power consumption too much. A state machine may be implemented to control receive diversity operation based on operating conditions such as an error rate, signal-to-interference ratio, and other factors.

Claims

1. A method of wireless communication, comprising:

comparing a performance metric to a threshold; and

enabling or disabling an additional receive chain based at least in part on a result of the comparing.

2. The method of claim 1, in which the performance metric comprises a block error rate (BLER), signal to interference ratio (SIR) target, special burst quality (SBQ), and/or received signal code power (RSCP).

3. The method of claim 1, in which the enabling or disabling is further based at least in part on a timer of a period of activity of the additional receive chain.

4. The method of claim 1, in which the enabling is further based at least in part on a power consumption of the additional receive chain.

5. The method of claim 1, in which the enabling or disabling is further based on a handover status and an out of synchronization status.

6. An apparatus for wireless communication, comprising:

means for comparing a performance metric to a threshold; and

means for enabling or disabling an additional receive chain based at least in part on a result of the comparing.

7. The apparatus of claim 6, in which the performance metric comprises a block error rate (BLER), signal to interference ratio (SIR) target, special burst quality (SBQ), and/or received signal code power (RSCP).

8. The apparatus of claim 6, in which the means for enabling or disabling accounts for a timer of a period of activity of the additional receive chain.

9. The apparatus of claim 6, in which the means for enabling accounts for power consumption of the additional receive chain.

10. The apparatus of claim 6, in which the means for enabling or disabling accounts for a handover status and an out of synchronization status.

11. An apparatus for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory and configured;

to compare a performance metric to a threshold; and

to enable or disable an additional receive chain based at least in part on a result of the comparing.

12. The apparatus of claim 11, in which the performance metric comprises a block error rate (BLER), signal to interference ratio (SIR) target, special burst quality (SBQ), and/or received signal code power (RSCP).

13. The apparatus of claim 11, in which the at least one processor is further configured to enable or disable based at least in part on a timer of a period of activity of the additional receive chain.

14. The apparatus of claim 11, in which the at least one processor is further configured to enable or disable based at least in part on a power consumption of the additional receive chain.

15. The apparatus of claim 11, in which the at least one processor is further configured to enable or disable based on a handover status and an out of synchronization status.

16. A computer program product for wireless communication in a wireless network, comprising:

a computer-readable medium having non-transitory program code recorded thereon, the program code comprising;

program code to compare a performance metric to a threshold; and

program code to enable or disable an additional receive chain based at least in part on a result of the comparing.

17. The computer program product of claim 16, in which the performance metric comprises a block error rate (BLER), signal to interference ratio (SIR) target, special burst quality (SBQ), and/or received signal code power (RSCP).

18. The computer program product of claim 16, in which the program code to enable or disable accounts for a timer of a period of activity of the additional receive chain.

19. The computer program product of claim 16, in which the program code to enable accounts for power consumption of the additional receive chain.

20. The computer program product of claim 16, in which the program code to enable or disable accounts for a handover status and an out of synchronization status.