Maximum power spectral density reporting in response to overload indications

• US 8,976,729 B2
• Filed: 08/16/2010
• Issued: 03/10/2015
• Est. Priority Date: 08/19/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Luo, Tao, Damnjanovic, Aleksandar, Malladi, Durga Prasad, Wei, Yongbin, Barany, Peter A.
• Primary Examiner(s): Masur, Paul H
• Application Number:
  US12/857,243
• Publication Number:
  US 20110044247A1
• Time in Patent Office: 1,667 Days
• Field of Search: 370/328, 455/39, 455/501, 455/507, 455/517, 455/522
• US Class Current: 370/328
• CPC Class Codes: H04L 1/0031 Multiple signaling transmission H04L1/1664, F15 take precedence
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff

Abstract

Certain aspects of the present disclosure propose methods for reporting information such as a maximum power spectral density to a serving access point after receiving overload indicators from one or more neighboring access points. The reported information may be multiplexed with other information (e.g., Channel Quality Indicator (CQI), Precoding Matrix Index (PMI), rank indication (RI) or acknowledgement (ACK)/negative acknowledgment (NACK) message for downlink data channel) before transmission to the serving access point. In addition, the information may be transmitted in a medium access control (MAC) packet data unit (PDU).

Claims

1. A method for wireless communications, comprising:

receiving one or more interference overload indicator messages from one or more neighboring access points;

receiving, from a serving access point, an indication of a quantity of bits for a physical uplink control channel in which a maximum power spectral density is to be reported;

calculating, based on information in the overload indicator messages, information to report for one or more subcarriers, wherein the calculated information is a maximum power spectral density and wherein the maximum power spectral density is reported in one or more bits, indicated by the received indication of the quantity of bits, of the physical uplink control channel; and

multiplexing the calculated information with other information reported to the serving access point, wherein the other reported information comprises at least one of a channel quality indicator, a pre-coding matrix index, a rank indicator, an acknowledgment message, or a negative acknowledgment message for a downlink data channel.

2. The method of claim 1, wherein the maximum power spectral density is reported for a plurality of subcarriers.

3. The method of claim 2, wherein the maximum power spectral density is reported for different subcarriers in different instances of a physical uplink control channel.

4. The method of claim 1, wherein the quantity of bits is configurable by the serving access point.

5. The method of claim 1, wherein the multiplexing comprises:

transmitting the calculated information with a different periodicity than the other reported information.

6. The method of claim 1, wherein the multiplexing comprises:

multiplexing the calculated information with the other reported information in a single instance of a physical uplink control channel.

7. The method of claim 1, wherein the multiplexing comprises:

multiplexing the calculated information with the other reported information in one or more physical uplink control channels at a first resolution; and

transmitting the calculated information in one or more medium access control protocol data units at a second resolution.

8. A method for wireless communications, comprising:

transmitting, to a user equipment, an indication of a quantity of bits of the physical uplink control channel in which a maximum power spectral density is to be reported;

receiving information from the user equipment in response to an overload indicator message, wherein the information is multiplexed with other reported information, wherein the other reported information comprises at least one of a channel quality indicator, a pre-coding matrix index, a rank indicator, an acknowledgment message, or a negative acknowledgment message for a downlink data channel, and wherein the received information is a maximum power spectral density, wherein the maximum power spectral density is reported in one or more bits, indicated by the transmitted indication of the quantity of bits, of the physical uplink control channel; and

performing inter-cell interference coordination based on the received information.

9. The method of claim 8, further comprising:

transmitting one or more interference overload indicator messages to one or more user equipments that are served by neighboring access points.

10. The method of claim 8, wherein the maximum power spectral density is received for a plurality of subcarriers.

11. The method of claim 10, wherein the maximum power spectral density is received for different subcarriers in different instances of a physical uplink control channel.

12. The method of claim 8, wherein the quantity of bits is configurable by a serving access point.

13. The method of claim 8, wherein the information is received with a different periodicity than the other reported information.

14. The method of claim 8, wherein the information and the other reported information are received in a single instance of a physical uplink control channel.

15. The method of claim 8, wherein the receiving comprises:

receiving the information from the user equipment in one or more physical uplink control channels at a first resolution; and

receiving the information from the user equipment in one or more medium access control protocol data units at a second resolution.

16. An apparatus for wireless communications, comprising:

one or more processors configured to;

receive one or more interference overload indicator messages from one or more neighboring access points;

receive, from a serving access point, an indication of a quantity of bits for a physical uplink control channel in which a maximum power spectral density is to be reported;

calculate, based on information in the overload indicator messages, information to report for one or more subcarriers, wherein the calculated information is a maximum power spectral density and wherein the maximum power spectral density is reported in one or more bits, indicated by the received indication of the quantity of bits, of the physical uplink control channel; and

multiplex the calculated information with other information reported to the serving access point, wherein the other reported information comprises at least one of a channel quality indicator, a pre-coding matrix index, a rank indicator, an acknowledgment message, or a negative acknowledgment message for a downlink data channel; and

a memory coupled to the one or more processors.

17. The apparatus of claim 16, wherein the maximum power spectral density is reported for a plurality of subcarriers.

18. The apparatus of claim 17, wherein the maximum power spectral density is reported for different subcarriers in different instances of a physical uplink control channel.

19. The apparatus of claim 16, wherein the quantity of the bits is configurable by the serving access point.

20. The apparatus of claim 16, wherein the one or more processors are further configured to:

transmit the calculated information with a different periodicity than the other reported information.

21. The apparatus of claim 16, wherein the one or more processors are further configured to:

multiplex the calculated information with the other reported information in a single instance of a physical uplink control channel.

22. The apparatus of claim 16, wherein the one or more processors are further configured to:

multiplex the calculated information with the other reported information in one or more physical uplink control channels at a first resolution; and

transmit the calculated information in one or more medium access control protocol data units at a second resolution.

23. An apparatus for wireless communications, comprising:

one or more processors configured to;

transmit, to a user equipment, an indication of a quantity of bits of a physical uplink control channel in which a maximum power spectral density is to be reported;

receive information from the user equipment in response to an overload indicator message, wherein the information is multiplexed with other reported information, wherein the other reported information comprises at least one of a channel quality indicator, a pre-coding matrix index, a rank indicator, an acknowledgment message, or a negative acknowledgment message for a downlink data channel, wherein the received information is a maximum power spectral density and wherein the maximum power spectral density is reported in one or more bits, indicated by the transmitted indication of the quantity of bits, of the physical uplink control channel; and

perform inter-cell interference coordination based on the received information; and

a memory coupled to the one or more processors.

24. The apparatus of claim 23, wherein the one or more processors are further configured to:

transmit one or more interference overload indicator messages to one or more user equipments that are served by neighboring access points.

25. The apparatus of claim 23, wherein the maximum power spectral density is received for a plurality of subcarriers.

26. The apparatus of claim 25, wherein the maximum power spectral density is received for different subcarriers in different instances of a physical uplink control channel.

27. The apparatus of claim 23, wherein the processor is further configured to configure the quantity of bits.

28. The apparatus of claim 23, wherein the information is received with a different periodicity than the other reported information.

29. The apparatus of claim 23, wherein the information and the other reported information are received in a single instance of a physical uplink control channel.

30. The apparatus of claim 23, wherein the one or more processors are further configured to:

receive the information in one or more physical uplink control channels at a first resolution; and

receive the information in one or more medium access control protocol data units at a second resolution.

31. An apparatus for wireless communications, comprising:

means for receiving one or more interference overload indicator messages from one or more neighboring access points;

means for receiving, from a serving access point, an indication of a quantity of bits for a physical uplink control channel in which a maximum power spectral density is to be reported;

means for calculating, based on information in the overload indicator messages, information to report for one or more subcarriers, wherein the calculated information is a maximum power spectral density and wherein the maximum power spectral density is reported in one or more bits, indicated by the received indication of the quantity of bits, of the physical uplink control channel; and

means for multiplexing the calculated information with other information reported to the serving access point, wherein the other reported information comprises at least one of a channel quality indicator, a pre-coding matrix index, a rank indicator, an acknowledgment message, or a negative acknowledgment message for a downlink data channel.

32. The apparatus of claim 31, wherein the maximum power spectral density is reported for a plurality of subcarriers.

33. The apparatus of claim 32, wherein the maximum power spectral density is reported for different subcarriers in different instances of a physical uplink control channel.

34. The apparatus of claim 31, wherein the quantity of the bits is configurable by the serving access point.

35. The apparatus of claim 31, further comprising means for transmitting the calculated information with a different periodicity than the other reported information.

36. The apparatus of claim 31, further comprising means for multiplexing the calculated information with the other reported information in a single instance of a physical uplink control channel.

37. The apparatus of claim 31, further comprising:

means for multiplexing the calculated information with the other reported information in one or more physical uplink control channels at a first resolution; and

means for transmitting the calculated information in one or more medium access control protocol data units at a second resolution.

38. An apparatus for wireless communications, comprising:

means for transmitting, to a user equipment, an indication of a quantity of bits of the physical uplink control channel in which a maximum power spectral density is to be reported;

means for receiving information from the user equipment in response to an overload indicator message, wherein the information is multiplexed with other reported information, wherein the other reported information comprises at least one of a channel quality indicator, a pre-coding matrix index, a rank indicator, an acknowledgment message, or a negative acknowledgment message for a downlink data channel, and wherein the received information is a maximum power spectral density, wherein the maximum power spectral density is reported in one or more bits, indicated by the transmitted indication of the quantity of bits, of the physical uplink control channel; and

means for performing inter-cell interference coordination based on the received information.

39. The apparatus of claim 38, further comprising means for transmitting one or more interference overload indicator messages to one or more user equipments that are served by neighboring access points.

40. The apparatus of claim 38, wherein the maximum power spectral density is received for a plurality of subcarriers.

41. The apparatus of claim 40, wherein the maximum power spectral density is received for different subcarriers in different instances of a physical uplink control channel.

42. The apparatus of claim 38, wherein the quantity of bits is configurable by the apparatus.

43. The apparatus of claim 38, wherein the information is received with a different periodicity than the other reported information.

44. The apparatus of claim 38, wherein the information and the other reported information are received in a single instance of a physical uplink control channel.

45. The apparatus of claim 38, further comprising:

means for receiving the information in one or more physical uplink control channels at a first resolution; and

means for receiving the information in one or more medium access control protocol data units at a second resolution.

46. A computer-program product for wireless communications, comprising a non-transitory computer readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:

instructions for receiving one or more interference overload indicator messages from one or more neighboring access points;

instructions for receiving, from a serving access point, an indication of a quantity of bits for a physical uplink control channel in which a maximum power spectral density is to be reported;

instructions for calculating, based on information in the overload indicator messages, information to report for one or more subcarriers, wherein the calculated information is a maximum power spectral density and wherein the maximum power spectral density is reported in one or more bits, indicated by the received indication of the quantity of bits, of the physical uplink control channel; and

instructions for multiplexing the calculated information with other information reported to the serving access point, wherein the other information comprises at least one of a channel quality indicator, a pre-coding matrix index, a rank indicator, an acknowledgment message, or a negative acknowledgment message for a downlink data channel.

47. A computer-program product for wireless communications, comprising a non-transitory computer readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:

instructions for transmitting, to a user equipment, an indication of a quantity of the bits of the physical uplink control channel in which a maximum power spectral density is to be reported;

instructions for receiving information from a user equipment in response to an overload indicator message, wherein the information is multiplexed with other reported information, wherein the other reported information comprises at least one of a channel quality indicator, a pre-coding matrix index, a rank indicator, an acknowledgment message, or a negative acknowledgment message for downlink data channel, and wherein the received information is a maximum power spectral density, wherein the maximum power spectral density is reported in one or more bits, indicated by the transmitted indication of the quantity of bits, of the physical uplink control channel; and

instructions for performing inter-cell interference coordination based on the received information.