POWER HEADROOM-SENSITIVE SCHEDULING

• US 20100120446A1
• Filed: 11/09/2009
• Published: 05/13/2010
• Est. Priority Date: 11/10/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gaal, Peter
• Granted Patent: US 8,606,289 B2
• Time in Patent Office: Days
• US Class Current: 455/452.200
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

User equipment reports periodically or aperiodically serving cell reference signal received power and quality as well as uplink power headroom information to the serving evolved NodeB (eNB). eNB calculates a current interference level experienced by the UE from the feedback report and its own loading. Since the self-interference is not flat across frequencies, the tolerable self-interference level depends on downlink scheduling. From the calculated interference, eNB can calculate uplink allocation parameters. Sequence of scheduling decisions can be downlink allocation, determining tolerable self-interference, and uplink allocation, or in the opposite order, or the downlink and uplink allocation can be jointly determined using the available. An additional scheduling constraint can be derived for meeting the co-existence requirements, which can be determined from the power headroom report alone. Thereby interference to other user equipment or self-interference (self-desensitization) is addressed when inadequate attenuation exists while also allowing deploying full system bandwidth.

Claims

1. A method for mitigating inadequate attenuation for co-existence between channels, the method comprising:

employing a processor executing computer executable instructions stored on a computer readable storage medium to implement following acts;

scheduling via a downlink channel a transmission by a first user equipment on an uplink channel;

determining that an uplink frequency band and a first transmit power level used for the transmission by the first user equipment provides an inadequate attenuation to a downlink frequency band on the downlink channel; and

changing the scheduling of a transmission on one of the uplink channel and the downlink channel to provide an adequate attenuation.

2. The method of claim 1, further comprising determining the inadequate attenuation comprising interference to a second user equipment.

3. The method of claim 1, further comprising determining the inadequate attenuation comprising self desensitization to the first user equipment.

4. The method of claim 1, further comprising changing the scheduling of the transmission by assigning a second frequency band with the adequate attenuation.

5. The method of claim 1, further comprising changing the scheduling of the transmission by reducing the first transmit power level to a second transmit power level.

6. The method of claim 1, further comprising:

receiving a feedback report; and

calculating an interference value based at least in part upon the feedback report.

7. The method of claim 6, further comprising receiving the feedback report containing a downlink reference power value, a downlink reference quality value, and an uplink transmit power value.

8. The method of claim 6, further comprising receiving the feedback report containing a reference signal received power information, a reference signal received quality information, and an uplink power headroom information.

9. The method of claim 6, further comprising calculating the interference value by accessing a tolerated self-interference level based upon a total interference value minus thermal noise minus a total interference from any base stations indicated by the feedback report.

10. The method of claim 9, further comprising calculating the interference value based upon at least one uplink allocation parameter for the first user equipment, wherein self-interference is non-uniform across the uplink channel.

11. The method of claim 10, further comprising determining the at least one uplink allocation parameter selected from a group consisting of a start resource block, a number of resource blocks allocated to the first user equipment, and a power control value for the first user equipment.

12. The method of claim 6, further comprising estimating a portion of self-interference for the first user equipment by accessing a value for a typical power amplifier and a typical duplexer isolation.

13. A computer program product for mitigating inadequate attenuation for co-existence between channels, the computer program product comprising:

at least one computer readable storage medium storing computer executable instructions that, when executed by at least one processor, implement components comprising;

a first set of codes for scheduling via a downlink channel a transmission by a first user equipment on an uplink channel;

a second set of codes for determining that an uplink frequency band and a first transmit power level used for the transmission by the first user equipment provides an inadequate attenuation to a downlink frequency band on the downlink channel; and

a third set of codes for changing the scheduling of a transmission on one of the uplink channel and the downlink channel to provide an adequate attenuation.

14. An apparatus for mitigating inadequate attenuation for co-existence between channels, the apparatus comprising:

at least one processor;

at least one computer readable storage medium storing computer executable instructions that, when executed by the at least one processor, implement components comprising;

means for scheduling via a downlink channel a transmission by a first user equipment on an uplink channel;

means for determining that an uplink frequency band and a first transmit power level used for the transmission by the first user equipment provides an inadequate attenuation to a downlink frequency band on the downlink channel; and

means for changing the scheduling of a transmission on one of the uplink channel and the downlink channel to provide an adequate attenuation.

15. An apparatus for mitigating inadequate attenuation for co-existence between channels, the apparatus comprising:

a transmitter;

a receiver;

a scheduler for scheduling via the transmitter on a downlink channel a transmission by a first user equipment received by the receiver on an uplink channel; and

a computing platform for determining that an uplink frequency band and a first transmit power level used for the transmission by the first user equipment provides an inadequate attenuation to a downlink frequency band on the downlink channel, and for changing the scheduling of a transmission on one of the uplink channel and the downlink channel to provide an adequate attenuation.

16. The apparatus of claim 15, wherein the computing platform is further for determining the inadequate attenuation comprising interference to a second user equipment.

17. The apparatus of claim 15, wherein the computing platform is further for determining the inadequate attenuation comprising self desensitization to the first user equipment.

18. The apparatus of claim 15, wherein the computing platform is further for changing the scheduling of the transmission by assigning a second frequency band with the adequate attenuation.

19. The apparatus of claim 15, wherein the computing platform is further for changing the scheduling of the transmission by reducing the first transmit power level to a second transmit power level.

20. The apparatus of claim 15, wherein the receiver is further for receiving a feedback report;

and

the computing platform is further for calculating an interference value based at least in part upon the feedback report.

21. The apparatus of claim 20, wherein the receiver is further for receiving the feedback report containing a downlink reference power value, a downlink reference quality value, and an uplink transmit power value.

22. The apparatus of claim 20, wherein the receiver is further for receiving the feedback report containing a reference signal received power information, a reference signal received quality information, and an uplink power headroom information.

23. The apparatus of claim 20, wherein the computing platform is further for calculating the interference value by accessing a tolerated self-interference level based upon a total interference value minus thermal noise minus a total interference from any base stations indicated by the feedback report.

24. The apparatus of claim 23, wherein the computing platform is further for calculating the interference value based upon at least one uplink allocation parameter for the first user equipment, wherein self-interference is non-uniform across the uplink channel.

25. The apparatus of claim 24, wherein the computing platform is further for determining the at least one uplink allocation parameter selected from a group consisting of a start resource block, a number of resource blocks allocated to the first user equipment, and a power control value for the first user equipment.

26. The apparatus of claim 20, wherein the computing platform is further for estimating a portion of self-interference for the first user equipment by accessing a value for a typical power amplifier and a typical duplexer isolation.

27. A method for mitigating inadequate attenuation for co-existence between channels, the method comprising:

employing a processor executing computer executable instructions stored on a computer readable storage medium to implement following acts;

receiving a downlink channel from a serving node for scheduling a transmission by a first user equipment on an uplink channel;

determining a value related to self-interference;

transmitting a feedback report based upon the value for the serving node to determine that an uplink frequency band and a first transmit power level used for the transmission by the first user equipment provides an inadequate attenuation to a downlink frequency band on the downlink channel;

receiving a change in the scheduling of a transmission on one of the uplink channel and the downlink channel; and

transmitting on the uplink channel and receiving on the downlink channel in accordance with the change.

28. The method of claim 27, further comprising transmitting the feedback report for determining the inadequate attenuation comprising self desensitization to the first user equipment.

29. The method of claim 27, further comprising transmitting on the uplink channel in accordance with the change by transmitting on a second frequency band with the adequate attenuation.

30. The method of claim 27, further comprising transmitting on the uplink channel in accordance with the change by reducing transmit power.

31. The method of claim 27, further comprising transmitting the feedback report containing a downlink reference power value, a downlink reference quality value, and an uplink transmit power value.

32. The method of claim 31, further comprising transmitting the feedback report containing a reference signal received power information, a reference signal received quality information, and an uplink power headroom information.

33. A computer program product for mitigating inadequate attenuation for co-existence between channels, the computer program product comprising:

at least one computer readable storage medium storing computer executable instructions that, when executed by at least one processor, implement components comprising;

a first set of codes for receiving a downlink channel from a serving node for scheduling a transmission by a first user equipment on an uplink channel;

a second set of codes for determining a value related to self-interference;

a third set of codes for transmitting a feedback report based upon the value for the serving node to determine that an uplink frequency band and a first transmit power level used for the transmission by the first user equipment provides an inadequate attenuation to a downlink frequency band on the downlink channel;

a fourth set of codes for receiving a change in the scheduling of a transmission on one of the uplink channel and the downlink channel; and

a fifth set of codes for transmitting on the uplink channel and receiving on the downlink channel in accordance with the change.

34. An apparatus for mitigating inadequate attenuation for co-existence between channels, the apparatus comprising:

at least one processor;

at least one computer readable storage medium storing computer executable instructions that, when executed by the at least one processor, implement components comprising;

means for receiving a downlink channel from a serving node for scheduling a transmission by a first user equipment on an uplink channel;

means for determining a value related to self-interference;

means for transmitting a feedback report based upon the value for the serving node to determine that an uplink frequency band and a first transmit power level used for the transmission by the first user equipment provides an inadequate attenuation to a downlink frequency band on the downlink channel;

means for receiving a change in the scheduling of a transmission on one of the uplink channel and the downlink channel; and

means for transmitting on the uplink channel and receiving on the downlink channel in accordance with the change.

35. An apparatus for mitigating inadequate attenuation for co-existence between channels, the apparatus comprising:

a receiver for receiving a downlink channel from a serving node for scheduling a transmission by a first user equipment on an uplink channel;

a computing platform for determining a value related to self-interference;

a transmitter for transmitting a feedback report based upon the value for the serving node to determine that an uplink frequency band and a first transmit power level used for the transmission by the first user equipment provides an inadequate attenuation to a downlink frequency band on the downlink channel;

the receiver further for receiving a change in the scheduling of a transmission on one of the uplink channel and the downlink channel; and

the transmitter further for transmitting on the uplink channel and the receiver further for receiving on the downlink channel in accordance with the change.

36. The apparatus of claim 35, wherein the transmitter is further for transmitting the feedback report for determining the inadequate attenuation comprising self desensitization to the first user equipment.

37. The apparatus of claim 35, wherein the transmitter is further for transmitting on the uplink channel in accordance with the change by transmitting on a second frequency band with the adequate attenuation.

38. The apparatus of claim 35, wherein the transmitter is further for transmitting on the uplink channel in accordance with the change by reducing transmit power.

39. The apparatus of claim 35, wherein the transmitter is further for transmitting the feedback report containing a downlink reference power value, a downlink reference quality value, and an uplink transmit power value.

40. The apparatus of claim 39, wherein the transmitter is further for transmitting the feedback report containing a reference signal received power information, a reference signal received quality information, and an uplink power headroom information.

41. A method for mitigating inadequate attenuation for co-existence between channels, the method comprising:

employing a processor executing computer executable instructions stored on a computer readable storage medium to implement following acts;

controlling a transmission on a first wireless channel;

determining that a frequency band and a transmit power used for the transmission provide a attenuation that is inadequate to a second wireless channel; and

changing the transmission on the first wireless channel to increase the attenuation to the second wireless channel.

42. The method of claim 41, further comprising controlling the transmission on the first wireless channel by scheduling user equipment.

43. The method of claim 41, further comprising controlling the transmission on the first wireless channel by receiving a grant from a serving node and using resources on the first wireless channel given by the grant.

44. The method of claim 41, further comprising determining the attenuation by receiving a feedback report.

45. The method of claim 41, further comprising controlling the transmission on the first wireless channel comprising an uplink channel.

46. The method of claim 41, further comprising controlling the transmission on the first wireless channel comprising a downlink channel.

47. The method of claim 41, further comprising changing the transmission on the first wireless channel transmitted by a first user equipment to increase the attenuation to the second wireless channel received by the first user equipment.

48. The method of claim 41, further comprising changing the transmission on the first wireless channel transmitted by a first user equipment to increase the attenuation to the second wireless channel received by a second user equipment.

49. A computer program product for mitigating the attenuation that is inadequate for co-existence between channels, the computer program product comprising:

at least one computer readable storage medium storing computer executable instructions that, when executed by at least one processor, implement components comprising;

a first set of codes for controlling a transmission on a first wireless channel;

a second set of codes for determining that a frequency band and a transmit power used for the transmission provide the attenuation that is inadequate to a second wireless channel; and

a third set of codes for changing the transmission on the first wireless channel to increase the attenuation to the second wireless channel.

50. An apparatus for mitigating inadequate attenuation for co-existence between channels, the apparatus comprising:

at least one processor;

at least one computer readable storage medium storing computer executable instructions that, when executed by the at least one processor, implement components comprising;

means for controlling a transmission on a first wireless channel;

means for determining that a frequency band and a transmit power used for the transmission provide attenuation that is inadequate to a second wireless channel; and

means for changing the transmission on the first wireless channel to increase the attenuation to the second wireless channel.

51. An apparatus for mitigating the attenuation that is inadequate for co-existence between channels, the apparatus comprising:

a transmitter for controlling a transmission on a first wireless channel;

a computing platform for determining that a frequency band and a transmit power used for the transmission provide attenuation that is inadequate to a second wireless channel; and

the transmitter further for changing the transmission on the first wireless channel to increase the attenuation to the second wireless channel.

52. The apparatus of claim 51, further comprising a scheduler for controlling the transmission on the first wireless channel by scheduling user equipment.

53. The apparatus of claim 51, further comprising a receiver for receiving a grant from a serving node and wherein the transmitter is further for controlling the transmission on the first wireless channel by using resources on the first wireless channel given by the grant.

54. The apparatus of claim 51, wherein the computing platform is further for determining the attenuation that is inadequate by receiving a feedback report.

55. The apparatus of claim 51, wherein the computing platform is further for controlling the transmission on the first wireless channel comprising an uplink channel.

56. The apparatus of claim 51, wherein the computing platform is further for controlling the transmission on the first wireless channel comprising a downlink channel.

57. The apparatus of claim 51, wherein the transmitter is further for changing the transmission on the first wireless channel transmitted by a first user equipment to increase the attenuation to the second wireless channel received by the first user equipment.

58. The apparatus of claim 51, wherein the transmitter is further for changing the transmission on the first wireless channel transmitted by a first user equipment to increase the attenuation to the second wireless channel received by a second user equipment.