Detection of fades for receive diversity enablement in a fading channel

• US 9,686,744 B2
• Filed: 02/22/2016
• Issued: 06/20/2017
• Est. Priority Date: 08/07/2015
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: He, Ruhua, Kong, Ting, Kunchithapatham, Sundararaman, Putta, Vidya Sagar, Ali, Ahmed, Appani, Praveen Kumar, Tsai, Stanley, Ganti, Kamalakar, Kitabi, Ammar
• Primary Examiner(s): LE, NHAN T
• Application Number:
  US15/050,232
• Publication Number:
  US 20170041878A1
• Time in Patent Office: 484 Days
• Field of Search: 455 6713, 455101, 4555501, 375299, 375347
• CPC Class Codes: H04B 7/082 selecting best antenna path
• CPC Class Codes: H04B 7/0871 using different reception schemes, at least one of them being a diversity reception scheme
• CPC Class Codes: H04B 7/0877 switching off a diversity branch, e.g. to save power
• CPC Class Codes: H04W 52/0235 where the received signal is a power saving command
• CPC Class Codes: H04W 52/0238 where the received signal is an unwanted signal, e.g. interference or idle signal
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The disclosure discloses enabling/disabling receive diversity, including determining the UE in a receive diversity enabled state; comparing a first and second receive chain filtered channel chip energy to interference density ratio to an E_cI₀ threshold, wherein the first and second receive chain filtered channel chip energy to interference density ratios are based on at least two power measurements obtained in the receive diversity enabled state; comparing a first receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld to a non-receive diversity threshold, wherein the first receive chain measured number of E_c/I₀ samples is based on the first receive chain filtered channel chip energy to interference density ratio; and comparing a second receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld to the non-receive diversity threshold, wherein the second receive chain measured number of E_c/I₀ samples is based on the second receive chain filtered channel chip energy to interference density ratio.

Claims

1. A method of wireless communication operable at a user equipment (UE) configured for enabling or disabling receive diversity, comprising:

determining if the UE is in a receive diversity enabled (RxD) state at a current time interval;

comparing a first receive chain filtered channel chip energy to interference density ratio to an E_cI₀ threshold;

comparing a second receive chain filtered channel chip energy to interference density ratio to the E_cI₀ threshold, wherein the first and second receive chain filtered channel chip energy to interference density ratios are based on at least two power measurements obtained in the receive diversity enabled (RxD) state;

comparing a first receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld to a non-receive diversity threshold, LCR_thrshld_toNonRxD, wherein the first receive chain measured number of E_c/I₀ samples is based on the first receive chain filtered channel chip energy to interference density ratio; and

comparing a second receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld to the non-receive diversity threshold, LCR_thrshld_toNonRxD, wherein the second receive chain measured number of E_c/I₀ samples is based on the second receive chain filtered channel chip energy to interference density ratio.

2. The method of claim 1, further comprising:

determining if either the first or the second, or both the first and the second receive chain filtered channel chip energy to interference density ratio is less than the E_cI₀ threshold;

or determining if either the first or the second, or both the first and the second receive chain measured number of E_c/I₀ samples is greater than or equal to the non-receive diversity threshold, LCR_thrshld_toNonRxD; and

setting a receiver in the UE to a receive diversity enabled state in a next time interval, wherein the next time interval follows the current time interval.

3. The method of claim 1, further comprising:

determining that the first and the second receive chain filtered channel chip energy to interference density ratio is greater than or equal to the E_cI₀ threshold;

determining that the first and the second receive chain measured number of E_c/I₀ samples is less than the non-receive diversity threshold, LCR_thrshld_toNonRxD; and

setting a receiver in the UE to a receive diversity disabled state in a next time interval, wherein the next time interval follows the current time interval.

4. A method of wireless communication operable at a user equipment (UE) configured for enabling or disabling receive diversity, comprising:

determining if the UE is in a receive diversity enabled (RxD) state at a current time interval;

comparing a receive chain filtered channel chip energy to interference density ratio to an E_cI₀ threshold, wherein the receive chain filtered channel chip energy to interference density ratio is based on a power measurement obtained in the receive diversity enabled (RxD) state; and

comparing a receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld to a receive diversity threshold, LCR_thrshld_toRxD, wherein the receive chain measured number of E_c/I₀ samples is based on the receive chain filtered channel chip energy to interference density ratio.

5. The method of claim 4, further comprising:

determining that the receive chain filtered channel chip energy to interference density ratio is less than the E_cI₀ threshold;

or

determining that the receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld is greater than or equal to the receive diversity threshold, LCR_thrshld_toRxD; and

setting a receiver in the UE to a receive diversity enabled state in a next time interval, wherein the next time interval follows the current time interval.

6. The method of claim 4, further comprising:

determining if the receive chain filtered channel chip energy to interference density ratio is greater than or equal to the E_cI₀ threshold;

determining if the receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld is less than the receive diversity threshold, LCR_thrshld_toRxD and

setting a receiver in the UE to a receive diversity disabled state in a next time interval, wherein the next time interval follows the current time interval.

7. An apparatus for wireless communication operable at a user equipment (UE) configured for enabling or disabling receive diversity, comprising:

means for determining if the UE is in a receive diversity enabled (RxD) state at a current time interval;

means for comparing a first receive chain filtered channel chip energy to interference density ratio to an E_cI₀ threshold;

means for comparing a second receive chain filtered channel chip energy to interference density ratio to the E_cI₀ threshold, wherein the first and second receive chain filtered channel chip energy to interference density ratios are based on at least two power measurements obtained in the receive diversity enabled (RxD) state;

means for comparing a first receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld to a non-receive diversity threshold, LCR_thrshld_toNonRxD, wherein the first receive chain measured number of E_c/I₀ samples is based on the first receive chain filtered channel chip energy to interference density ratio; and

means for comparing a second receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld to the non-receive diversity threshold, LCR_thrshld_toNonRxD, wherein the second receive chain measured number of E_c/I₀ samples is based on the second receive chain filtered channel chip energy to interference density ratio.

8. The apparatus of claim 7, further comprising:

means for determining if either the first or the second, or both the first and the second receive chain filtered channel chip energy to interference density ratio is less than the E_cI₀ threshold;

or determining if either the first or the second, or both the first and the second receive chain measured number of E_c/I₀ samples is greater than or equal to the non-receive diversity threshold, LCR_thrshld_toNonRxD; and

means for setting a receiver in the UE to a receive diversity enabled state in a next time interval, wherein the next time interval follows the current time interval.

9. The apparatus of claim 7, further comprising:

means for determining that the first and the second receive chain filtered channel chip energy to interference density ratio is greater than or equal to the E_cI₀ threshold;

means for determining that the first and the second receive chain measured number of E_c/I₀ samples is less than the non-receive diversity threshold, LCR_thrshld_toNonRxD; and

means for setting a receiver in the UE to a receive diversity disabled state in a next time interval, wherein the next time interval follows the current time interval.

10. An apparatus for wireless communication operable at a user equipment (UE) configured for enabling or disabling receive diversity, comprising:

means for determining if the UE is in a receive diversity enabled (RxD) state at a current time interval;

means for comparing a receive chain filtered channel chip energy to interference density ratio to an E_cI₀ threshold, wherein the receive chain filtered channel chip energy to interference density ratio is based on a power measurement obtained in the receive diversity enabled (RxD) state; and

means for comparing a receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld to a receive diversity threshold, LCR_thrshld_toRxD, wherein the receive chain measured number of E_c/I₀ samples is based on the receive chain filtered channel chip energy to interference density ratio.

11. The apparatus of claim 10, further comprising:

means for determining that the receive chain filtered channel chip energy to interference density ratio is less than the E_cI₀ threshold;

or

means for determining that the receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld is greater than or equal to the receive diversity threshold, LCR_thrshld_toRxD; and

means for setting a receiver in the UE to a receive diversity enabled state in a next time interval, wherein the next time interval follows the current time interval.

12. The apparatus of claim 10, further comprising:

means for determining if the receive chain filtered channel chip energy to interference density ratio is greater than or equal to the E_cI₀ threshold;

means for determining if the receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld is less than the receive diversity threshold, LCR_thrshld_toRxD and

means for setting a receiver in the UE to a receive diversity disabled state in a next time interval, wherein the next time interval follows the current time interval.

13. An apparatus for wireless communication operable at a user equipment (UE) configured for enabling or disabling receive diversity, comprising:

a controller configured for determining if the UE is in a receive diversity enabled (RxD) state at a current time interval; and

a channel decoder configured for comparing a first receive chain filtered channel chip energy to interference density ratio to an E_cI₀ threshold, and for comparing a second receive chain filtered channel chip energy to interference density ratio to the E_cI₀ threshold, wherein the first and second receive chain filtered channel chip energy to interference density ratios are based on at least two power measurements obtained in the receive diversity enabled (RxD) state; and

wherein the controller is further configured for comparing a first receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld to a non-receive diversity threshold, LCR_thrshld_toNonRxD, wherein the first receive chain measured number of E_c/I₀ samples is based on the first receive chain filtered channel chip energy to interference density ratio, and for comparing a second receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld to the non-receive diversity threshold, LCR_thrshld_toNonRxD, wherein the second receive chain measured number of E_c/I₀ samples is based on the second receive chain filtered channel chip energy to interference density ratio.

14. The apparatus of claim 13, wherein if either the first or the second, or both the first and the second receive chain filtered channel chip energy to interference density ratio is less than the E_cI₀ threshold;

or if either the first or the second, or both the first and the second receive chain measured number of E_c/I₀ samples is greater than or equal to the non-receive diversity threshold, LCR_thrshld_toNonRxD, then the controller is further configured for setting a receiver in the UE to a receive diversity enabled state in a next time interval, wherein the next time interval follows the current time interval.

15. The apparatus of claim 13, wherein if the first and the second receive chain filtered channel chip energy to interference density ratio is greater than or equal to the E_cI₀ threshold and if the first and the second receive chain measured number of E_c/I₀ samples is less than the non-receive diversity threshold, LCR_thrshld_toNonRxD, then the controller is further configured for setting a receiver in the UE to a receive diversity disabled state in a next time interval, wherein the next time interval follows the current time interval.

16. An apparatus for wireless communication operable at a user equipment (UE) configured for enabling or disabling receive diversity, comprising:

a controller configured for determining if the UE is in a receive diversity enabled (RxD) state at a current time interval; and

a channel decoder for comparing a receive chain filtered channel chip energy to interference density ratio to an E_cI₀ threshold, wherein the receive chain filtered channel chip energy to interference density ratio is based on a power measurement obtained in the receive diversity enabled (RxD) state; and

wherein the controller is further configured for comparing a receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld to a receive diversity threshold, LCR_thrshld_toRxD, wherein the receive chain measured number of E_c/I₀ samples is based on the receive chain filtered channel chip energy to interference density ratio.

17. The apparatus of claim 16, wherein if the receive chain filtered channel chip energy to interference density ratio is less than the E_cI₀ threshold, or if the receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld is greater than or equal to the receive diversity threshold, LCR_thrshld_toRxD, then the controller is further configured for setting a receiver in the UE to a receive diversity enabled state in a next time interval, wherein the next time interval follows the current time interval.

18. The apparatus of claim 16, wherein if the receive chain filtered channel chip energy to interference density ratio is greater than or equal to the E_cI₀ threshold, and if the receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld is less than the receive diversity threshold, LCR_thrshld_toRxD, then the controller is further configured for setting a receiver in the UE to a receive diversity disabled state in a next time interval, wherein the next time interval follows the current time interval.

19. A non-transitory computer-readable storage medium storing computer executable code, operable on a device comprising at least one processor;

a memory for storing a plurality of victim bands, the memory coupled to the at least one processor; and

the computer executable code comprising;

instructions for causing the at least one processor to determine if the UE is in a receive diversity enabled (RxD) state at a current time interval;

instructions for causing the at least one processor to compare a first receive chain filtered channel chip energy to interference density ratio to an E_cI₀ threshold;

instructions for causing the at least one processor to compare a second receive chain filtered channel chip energy to interference density ratio to the E_cI₀ threshold, wherein the first and second receive chain filtered channel chip energy to interference density ratios are based on at least two power measurements obtained in the receive diversity enabled (RxD) state;

instructions for causing the at least one processor to compare a first receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld to a non-receive diversity threshold, LCR_thrshld_toNonRxD, wherein the first receive chain measured number of E_c/I₀ samples is based on the first receive chain filtered channel chip energy to interference density ratio; and

instructions for causing the at least one processor to compare a second receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld to the non-receive diversity threshold, LCR_thrshld_toNonRxD, wherein the second receive chain measured number of E_c/I₀ samples is based on the second receive chain filtered channel chip energy to interference density ratio.

20. A non-transitory computer-readable storage medium storing computer executable code, operable on a device comprising at least one processor;

a memory for storing a plurality of victim bands, the memory coupled to the at least one processor; and

the computer executable code comprising;

instructions for causing the at least one processor to determine if the UE is in a receive diversity enabled (RxD) state at a current time interval;

instructions for causing the at least one processor to compare a receive chain filtered channel chip energy to interference density ratio to an E_cI₀ threshold, wherein the receive chain filtered channel chip energy to interference density ratio is based on a power measurement obtained in the receive diversity enabled (RxD) state; and

instructions for causing the at least one processor to compare a receive chain measured number of E_c/I₀ samples below E_cI_{0_}LCR_thrshld to a receive diversity threshold, LCR_thrshld_toRxD, wherein the receive chain measured number of E_c/I₀ samples is based on the receive chain filtered channel chip energy to interference density ratio.