Methods and apparatus for adjusting forward link signal to interference and noise ratio estimates

• US 8,537,875 B2
• Filed: 04/14/2011
• Issued: 09/17/2013
• Est. Priority Date: 04/14/2011
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Soriaga, Joseph B., Fan, Mingxi, Smee, John Edward, Chen, Jinghu, Hou, Jilei
• Primary Examiner(s): Ng, Fan
• Application Number:
  US13/086,564
• Publication Number:
  US 20120263164A1
• Time in Patent Office: 887 Days
• Field of Search: 370/310, 370/315, 370/316, 370/317, 370/318, 379/414, 379/416, 375/130, 375/140, 375/144, 375/147, 375/141, 375/148
• US Class Current: 375/130
• CPC Class Codes: H04B 17/336 Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0034 where the transmitter decides based on inferences, e.g. use of implicit signalling
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/267 taking into account the information rate
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels

Abstract

Methods and systems for adjusting a forward link (FL) signal to interference and noise ratio (SINR) are provided. In an example, a FL SINR is estimated for each user in a plurality of users, on at least one of each user'"'"'s respective data rate control (DRC) message or each user'"'"'s respective prior FL SINR value. The respective estimated FL SINR for a user in the plurality of users is increased, if, based on a reverse link acknowledge message, the user has decoded a packet before all symbols in the packet have been transmitted. Remaining control channel power is determined. The estimated FL SINR for all users in the plurality of users is increased if remaining control channel power is less than a low threshold. The estimated FL SINR for all users in the plurality of users is increased if the remaining control channel power is greater than a high threshold.

Claims

1. A method of adjusting a plurality of forward link (FL) signal to interference and noise ratio (SINR) estimates, comprising:

(a) estimating a FL SINR for each user in a plurality of users, based on at least one of each user'"'"'s respective data rate control (DRC) message or each user'"'"'s respective prior FL SINR value;

(b) increasing the respective estimated FL SINR for a user in the plurality of users, if, based on a reverse link acknowledge message, the user has decoded an early-terminating packet at a decoding bit rate higher than a data rate associated with the user'"'"'s respective DRC;

(c) determining control channel power remaining after step (b);

(d) increasing the estimated FL SINR for all users in the plurality of users if the remaining control channel power is less than a low threshold; and

(e) decreasing the estimated FL SINR for all users in the plurality of users if the remaining control channel power is greater than a high threshold.

2. The method of claim 1, further comprising receiving the DRC message from each user in the plurality of users prior to step (a).

3. The method of claim 1, further comprising filtering the prior respective FL SINR values of each user prior to step (a).

4. The method of claim 1, wherein increasing the estimated FL SINR for all users comprises limiting the increase to a maximum increase limit.

5. The method of claim 1, wherein decreasing the estimated FL SINR for all users comprises limiting the decrease to a minimum decrease limit.

6. The method of claim 1, further comprising repeating steps (b) through (e) until the remaining control channel power is between the high and low thresholds.

7. The method of claim 1, further comprising:

performing step (a) in a first time slot; and

performing steps (b) through (e) in a second time slot subsequent to the first time slot.

8. The method of claim 1, wherein step (d) comprises increasing the estimated FL SINR for a first user by a larger amount than the increase amount for a second user, if the first user'"'"'s DRC message is longer than the second user'"'"'s DRC message.

9. The method of claim 1, wherein step (e) comprises decreasing the estimated FL SINR for a first user by a larger amount than the decrease amount for a second user, if the first user'"'"'s DRC message is longer than the second user'"'"'s DRC message.

10. An apparatus for adjusting a plurality of forward link (FL) signal to interference and noise ratio (SINR) estimates, comprising:

a transceiver configured to support a plurality of communication links with a respective plurality of user access terminals;

a processor coupled to the transceiver; and

a memory coupled to the processor and comprising executable code to cause the processor to;

(a) estimate a FL SINR for each user in a plurality of users, based on at least one of each user'"'"'s respective data rate control (DRC) message or each users respective prior FL SINR value;

(b) increase the respective estimated FL SINR for a user in the plurality of users, if, based on a reverse link acknowledge message, the user has decoded an early-terminating packet at a decoding bit rate higher than a data rate associated with the user'"'"'s respective DRC;

(c) determine control channel power remaining after step (b);

(d) increase the estimated FL SINR for all users in the plurality of users if the remaining control channel power is less than a low threshold; and

(e) decrease the estimated FL SINR for all users in the plurality of users if the remaining control channel power is greater than a high threshold.

11. The apparatus of claim 10, wherein the memory further comprises executable code to cause the processor to receive the DRC message from each user in the plurality of users prior to step (a).

12. The apparatus of claim 10, wherein the memory further comprises executable code to cause the processor to filter the prior respective FL SINR values of each user prior to step (a).

13. The apparatus of claim 10, wherein the memory further comprises executable code to cause the processor to limit the increase of the estimated FL SINR for all users to a maximum increase limit.

14. The apparatus of claim 10, wherein the memory further comprises executable code to cause the processor to limit the decrease of the estimated FL SINR for all users to a minimum decrease limit.

15. The apparatus of claim 10, wherein the memory further comprises executable code to cause the processor to repeat steps (b) through (e) until the remaining control channel power is between the high and low thresholds.

16. The apparatus of claim 10, wherein the memory further comprises executable code to cause the processor to

perform step (a) in a first time slot;

and

perform steps (b) through (e) in a second time slot, subsequent to the first time slot.

17. The apparatus of claim 10, wherein the memory further comprises executable code to cause the processor to, in step (d), increase the estimated FL SINR for a first user by a larger amount than the increase amount for a second user, if the first users DRC message is longer than the second users DRC message.

18. The apparatus of claim 10, wherein the memory further comprises executable code to cause the processor to, in step (e), decreasing the estimated FL SINR for a first user by a larger amount than the decrease amount for a second user, if the first user'"'"'s DRC message is longer than the second user'"'"'s DRC message.

37. The apparatus of claim 10, wherein the transceiver is part of an access point.

19. An apparatus for adjusting a plurality of forward link (FL) signal to interference and noise ratio (SINR) estimates, comprising:

means for estimating a FL SINR for each user in a plurality of users, based on at least one of each user'"'"'s respective data rate control (DRC) message or each user'"'"'s respective prior FL SINR value;

means for increasing the respective estimated FL SINR for a user in the plurality of users, if, based on a reverse link acknowledge message, the user has decoded an early-terminating packet at a decoding bit rate higher than a data rate associated with the user'"'"'s respective DRC;

means for determining control channel power;

means for increasing the estimated FL SINR for all users in the plurality of users if the remaining control channel power is less than a low threshold; and

means for decreasing the estimated FL SINR for all users in the plurality of users if the remaining control channel power is greater than a high threshold.

20. The apparatus of claim 19, further comprising means for receiving the DRC message from each user in the plurality of users prior to estimating the FL SINR for each user.

21. The apparatus of claim 19, further comprising means for filtering the prior respective FL SINR values of each user prior to estimating the FL SINR for each user.

22. The apparatus of claim 19, wherein the means for increasing the estimated FL SINR for all users comprises means for limiting the increase to a maximum increase limit.

23. The apparatus of claim 19, wherein the means for decreasing the estimated FL SINR for all users comprises means for limiting the decrease to a minimum decrease limit.

24. The apparatus of claim 19, further comprising means for repeating, until the remaining control channel power is between the high and low thresholds, the increasing the respective estimated FL SINR for a user in the plurality of users, it based on a reverse link acknowledge message, the user has decoded a packet before all symbols in the packet have been transmitted;

the determining control channel power;

the increasing the estimated FL SINR for all users in the plurality of users if the remaining control channel power is less than a low threshold; and

the decreasing the estimated FL SINR for all users in the plurality of users if the remaining control channel power is greater than a high threshold.

25. The apparatus of claim 19, wherein the means for estimating the FL SINR further comprises means for performing the estimation in a first time slot;

and the means for increasing the respective estimated FL SINR for a user in the plurality of users comprises means for performing the increasing in a second time slot subsequent to the first time slot.

26. The apparatus of claim 19, wherein the means for increasing, the estimated FL SINR for all users in the plurality of users comprises means for increasing the estimated FL SINR for a first user by a larger amount than the increase amount for a second user, if the first user'"'"'s DRC message is longer than the second user'"'"'s DRC message.

27. The apparatus of claim 19, wherein the means for decreasing the estimated FL SINR for all users in the plurality of users comprises means for decreasing the estimated FL SINR for a first user by a larger amount than the decrease amount for a second user, if the first user'"'"'s DRC message is longer than the second users DRC message.

38. The apparatus of claim 19, wherein the means for increasing the respective estimated FL SINR for the user in the plurality of users is part of an access point.

28. A non-transitory processor-readable medium, comprising instructions that, if executed by a processor, cause the processor to:

(a) estimate a FL SINR for each user in a plurality of users, based on at least one of each user'"'"'s respective data rate control (DRC) message or each user'"'"'s respective prior FL SINR value;

(b) increase the respective estimated FL SINR for a user in the plurality of users, if, based on a reverse link acknowledge message, the user has decoded an early-terminating packet at a decoding bit rate higher than a data rate associated with the user'"'"'s respective DRC;

(c) determine control channel power remaining after step (b);

(d) increase the estimated FL SINR for all users in the plurality of users if the remaining control channel power is less than a low threshold; and

(e) decrease the estimated FL SINR for all users in the plurality of users if the remaining control channel power is greater than a high threshold.

29. The non-transitory processor-readable medium of claim 28, wherein the instructions include further instructions that, if executed by the processor, cause the processor to receive the DRC message from each user in the plurality of users prior to step (a).

30. The non-transitory processor-readable medium of claim 28, wherein the instructions include further instructions that, if executed by the processor, cause the processor to filter the prior respective FL SINR values of each user prior to step (a).

31. The non-transitory processor-readable medium of claim 28, wherein the instructions include further instructions that, if executed by the processor, cause the processor to limit the increase of the estimated FL SINR for all users to a maximum increase limit.

32. The non-transitory processor-readable medium of claim 28, wherein the instructions include further instructions that, if executed by the processor, cause the processor to limit the decrease of the estimated FL SINR for all users to a minimum decrease limit.

33. The non-transitory processor-readable medium of claim 28, wherein the instructions include further instructions that if executed by the processor, cause the processor to repeat steps (b) through (e) until the remaining control channel power is between the high and low thresholds.

34. The non-transitory processor-readable medium of claim 28, wherein the instructions include further instructions that, if executed by the processor, cause the processor to:

perform step (a) in a first time slot; and

perform steps (b) through (e) in a second time slot subsequent to the first time slot.

35. The non-transitory processor-readable medium of claim 28, wherein the instructions include further instructions that, if executed by the processor, cause the processor to increase the estimated FL SINR for a first user by a larger amount than the increase amount for a second user, if the first user'"'"'s DRC message is longer than the second user'"'"'s DRC message.

36. The non-transitory processor-readable medium of claim 28, wherein the instructions include further instructions that, if executed by the processor, cause the processor to decrease the estimated FL SINR for a first user by a larger amount than the decrease amount for a second user, if the first user'"'"'s DRC message is longer than the second user'"'"'s DRC message.