Multi-carrier, multi-flow, reverse link medium access control for a communication system

• US 20060203724A1
• Filed: 03/07/2006
• Published: 09/14/2006
• Est. Priority Date: 03/08/2005
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Ghosh, Donna, Attar, Rashid A., Lott, Christopher Gerard
• Application Number:
  US11/371,274
• Publication Number:
  US 20060203724A1
• Time in Patent Office: Days
• US Class Current: 370/229
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/21 using leaky-bucket
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04W 28/02 Traffic management, e.g. flow control or congestion control
• CPC Class Codes: H04W 28/10 Flow control between communication endpoints
• CPC Class Codes: H04W 28/14 using intermediate storage
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/265 taking into account the quality of service QoS
• CPC Class Codes: H04W 52/32 TPC of broadcast or control channels
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]
• CPC Class Codes: H04W 80/02 Data link layer protocols

Abstract

The present method and apparatus comprises a communication element comprising a MAC layer that is configured for wireless communication within a sector, wherein said communication element comprises a transmitter, a receiver operably connected to the transmitter, a processor operably connected to the transmitter and the receiver, and memory operably connected to the processor, wherein the communication element is adapted to police data flow, whereby a peak data outflow constraint is applied for each flow across all assigned carriers, select a carrier from a plurality of the assigned carriers for the data flow, and control flow access, whereby a potential allowed transmission power for the data flow on the carrier is determined.

Claims

1. A method of allocating resources among multiple flows transmitted across multiple carriers, comprising:

policing each data flow, whereby a peak data outflow constraint is applied for each flow across all assigned carriers;

selecting a carrier from a plurality of said assigned carriers for said data flow; and

controlling flow access, whereby a potential allowed transmission power for said data flow on said carrier is determined.

2. The method of allocating resources among the multiple flows according to claim 1, wherein said data flow is policed using a first bucket to shape traffic on a per flow basis and said flow access is controlled using a second bucket to shape transmit traffic channel power on a per flow and per carrier basis.

3. The method of allocating-resources among multiple flows transmitted across multiple carriers according to claim 1, wherein said step of policing data flow comprises:

allocating resources among multiple flows by determining a total available power for each flow, wherein said total available power includes a current power allocation for said flow and at least a portion of an accumulated power allocation for said flow.

4. The method of allocating resources among multiple flows transmitted across multiple carriers according to claim 1, wherein said step of controlling flow access comprises allocating resources using a grant.

5. The method of allocating resources among multiple flows transmitted across multiple carriers according to claim 1, wherein said step of controlling flow access comprises a step of allocating resources autonomously for each flow in each said assigned carrier.

6. The method of allocating resources among multiple flows transmitted across multiple carriers according to claim 1, wherein said step of selecting a carrier for said data flow comprises:

ranking said assigned carriers using a metric; and

allocating packets to said assigned carriers.

7. The method of allocating resources among multiple flows transmitted across multiple carriers according to claim 1, wherein said step of selecting a carrier for said data flow comprises:

water-filling power across all said assigned carriers when not data or power limited; and

transmitting across a subset of said assigned carriers when data or power limited.

8. The method of allocating resources among multiple flows transmitted across, multiple carriers according to claim 1, wherein said step of selecting a carrier for said data flow comprises:

transmitting across a number of said assigned carriers in an E_b/N₀efficient-mode.

9. The method of allocating resources among multiple flows transmitted across multiple carriers according to claim 1, wherein said step of selecting a carrier for said data flow comprises:

sending a carrier request message, whereby a number of said carriers may be increased.

10. The method of allocating resources among multiple flows transmitted across multiple carriers according to claim 1, wherein said step of selecting a carrier for said data flow comprises:

sending a carrier grant message, whereby an access node may increase, decrease or reassign said carrier.

11. The method according to claim 4, wherein said step of allocating flow resources using a grant comprises:

receiving a grant message; and

setting said current power allocation for a corresponding said flow equal to a current power allocation grant in said grant message.

12. The method of allocating resources among multiple flows transmitted across multiple carriers according to claim 4, further comprising:

determining MAC parameters for said flows across said carriers; and

allocating said carriers to arriving of said flows in an access terminal'"'"'s active set sectors, whereby said access terminal achieves long term load balancing.

13. The method of allocating resources among multiple flows transmitted across multiple carriers according to claim 5, further comprising:

determining MAC parameters for said flows across said carriers; and

allocating said carriers to arriving of said flows in an access terminal'"'"'s active set sectors, whereby said access terminal achieves long term load balancing.

14. The method according to claim 5, wherein said step of allocating resources autonomously comprise using an estimate of a loading level to allocate resources.

15. The method of allocating resources among multiple flows transmitted across multiple carriers according to claim 6, wherein said metric comprises an average pilot transmit power in each said assigned carrier, or a filtered reverse activity bit in each said assigned carrier, or a combination of both said average transmit pilot power and said filtered reverse activity bit in each said assigned carrier.

16. The method of allocating resources among multiple flows transmitted across multiple carriers according to claim 6, wherein said step of ranking assigned carriers using a metric further comprises maximizing a number of bits transmitted per unit power by first allocating power to said carriers with lower interference.

17. The method of allocating resources among multiple flows transmitted across multiple carriers according to claim 6, wherein said step of ranking assigned carriers using a metric further comprises indirectly measuring an interference seen by an access terminal on each said assigned carrier by measuring a transmit pilot power or a reverse activity bit.

18. The method of allocating resources among multiple flows transmitted across multiple carriers according to claim 6, further comprising allocating said packets on a per packet basis, whereby an access terminal achieves short term load balancing.

19. The method of allocating resources among multiple flows transmitted across multiple carriers according to claim 9, further comprising sending a carrier grant message, whereby an access node may increase, decrease or reassign assigned carriers.

20. The method of allocating resources among multiple flows transmitted across multiple carriers according to claim 9, wherein said carrier request comprises flow requirements, queue length and power headroom information.

21. The method according to claim 11, further comprising a step of sending a request message when a request interval increases above a threshold value.

22. The method according to claim 11, further comprising a step of sending a request message when a request ratio decreases below a certain threshold value.

23. The method according to claim 11, further comprising determining said grant for a subset of access terminals, wherein said grant includes a current power allocation grant.

24. The method according to claim 11, wherein said grant message includes a holding period for at least one said current power allocation grant and an accumulated power allocation grant for some at least one said flow.

25. The method according to claim 14, wherein said step of autonomously using an estimate of a loading level to determine a current power allocation for a flow comprises:

determining a value of said estimate associated with said flow;

determining whether said estimate is equal to a busy value;

decreasing said current power allocation if said estimate is equal to a busy value; and

increasing said current power allocation if said estimate is equal to an idle value.

26. The method according to claim 23, further comprising determining current power allocations for said access terminals not part of said subset of access terminals autonomously.

27. The method according to claim 23, wherein said current power allocation grant include an estimate of a steady-state value for said current power allocation for at least one said flow for at least one of said access terminals.

28. The method according to claim 25, further comprising:

calculating a magnitude of a decrease of said current power allocation using a downward ramping function; and

calculating a magnitude of an increase using an upward ramping function.

29. A communication element comprising a MAC layer that is configured for wireless communication, comprising:

a transmitter;

a receiver operably connected to said transmitter;

a processor operably connected to said transmitter and said transmitter; and

memory operably connected to said processor, wherein said access terminal is adapted to execute instructions stored in said memory comprising;

policing each data flow, whereby a peak data outflow constraint is applied for each flow across all assigned carriers;

selecting a carrier from a plurality of said assigned carriers for said data flow; and

controlling flow access, whereby a potential allowed transmission power for said data flow on said carrier is determined.

30. The communication element according to claim 29, wherein said data flow is policed using a first bucket to shape traffic on a per flow basis and said flow access is controlled using a second bucket to shape transmit traffic channel power on a per flow and per carrier basis.

31. The communication element according to claim 29, wherein said policing data flow instruction comprises:

allocating resources among multiple flows by determining a total available power for each flow, wherein said total available power includes a current power allocation for said flow and at least a portion of an accumulated power allocation for said flow.

32. The communication element according to claim 29, further comprising a scheduler adapted to allocate resources using a grant, wherein said instruction for controlling flow access comprises an instruction for allocating resources using a grant.

33. The communication element according to claim 29, wherein said instruction for controlling flow access comprises allocating resources autonomously for each flow in each said assigned carrier.

34. The communication element according to claim 29, wherein said instruction for selecting a carrier for said data flow comprises:

ranking said assigned carriers using a metric; and

allocating packets to said assigned carriers.

35. The communication element according to claim 29, wherein said step of selecting a carrier for said data flow comprises:

water-filling power across all assigned carriers when not data or power limited; and

transmitting across a subset of assigned carriers when data or power limited.

36. The communication element according to claim 29, wherein said step of selecting a carrier for said data flow comprises:

transmitting across a number of assigned carriers in an E_b/N₀efficient mode.

37. The communication element according to claim 29, wherein said instruction for selecting a carrier for said data flow comprises:

sending a carrier request message, whereby a number of said carrier may be increased.

38. The communication element according to claim 29, wherein said instruction for selecting a carrier for said data flow comprises further comprises an instruction for sending a carrier grant message, whereby an access node may increase, decrease or reassign said carrier.

39. The communication element according to claim 32, wherein said instruction for allocating flow resources using a grant comprises:

receiving a grant message; and

setting said current power allocation for a corresponding said flow equal to a current power allocation grant in said grant message.

40. The communication element according to claim 32, further comprising:

determining MAC parameters for said flows across said carriers; and

allocating said carriers to arriving of said flows in said communication elements'"'"'s active set sectors, whereby said communication element achieves long term load balancing.

41. The communication element according to claim 33, further comprising:

determining MAC parameters for said flows across said carriers; and

allocating said carriers to arriving of said flows in said communication element'"'"'s active set sectors, whereby said communication element achieves long term load balancing.

42. The communication element according to claim 33, wherein said instruction for allocating resources autonomously comprises using an estimate of a loading level to allocate resources.

43. The communication element according to claim 34, wherein said metric comprises an average pilot transmit power in each said assigned carrier, or a filtered reverse activity bit in each said assigned carrier, or a combination of both said average transmit pilot power and said filtered reverse activity bit in each said assigned carrier.

44. The communication element according to claim 34, wherein said step of ranking assigned carriers using a metric further comprises maximizing a number of bits transmitted per unit power by first allocating power to said carriers with lower interference.

45. The communication element according to claim 34, wherein said step of ranking assigned carriers using a metric further comprises indirectly measuring an interference seen by the communication element on each said assigned carrier by measuring a transmit pilot power or a reverse activity bit.

46. The communication element according to claim 34, further comprising allocating said packets on a per packet basis, whereby the communication element achieves short term load balancing.

47. The communication element according to claim 37, further comprising an instruction for sending a carrier grant message, whereby an access node may increase, decrease or reassign said assigned carriers.

48. The communication element according to claim 37, wherein said carrier request comprises flow requirements, queue length and power headroom information.

49. The communication element according to claim 39, further comprising an instruction for sending a request message when a request interval increases above a threshold value.

50. The communication element according to claim 39, further comprising an instruction for sending a request message when a request ratio decreases-below a certain threshold value.

51. The communication element according to claim 39, further comprising an instruction for determining said grant for a subset of said communication elements, wherein said grant includes a current power allocation grant.

52. The communication element according to claim 39, wherein said grant message includes a holding period for at least one said current power allocation grant and an accumulated power allocation grant for some at least one said flow.

53. The communication element according to claim 42, wherein said instruction for autonomously using an estimate of a loading level to determine a current power allocation for a flow comprises:

determining a value of said estimate associated with said flow;

determining whether said estimate is equal to a busy value;

decreasing said current power allocation if said estimate is equal to a busy value; and

increasing said current power allocation if said estimate is equal to an idle value.

54. The communication element according to claim 51, further comprising an instruction for determining current power allocations for said communication elements not part of said subset of communication elements autonomously.

55. The communication element according to claim 51, wherein said current power allocation grant includes an estimate of a steady-state value for said current power allocation for at least one said flow for at least one of said communication elements.

56. The communication element according to claim 53, further comprising the following instructions:

calculating a magnitude of a decrease of said current power allocation using a downward ramping function; and

calculating a magnitude of an increase using an upward ramping function.

57. A means for allocating resources among multiple flows transmitted across multiple carriers, comprising:

means for policing each data flow, whereby a peak data outflow constraint is applied for each flow across all assigned carriers;

means for selecting a carrier from a plurality of said assigned carriers for said data flow; and

means for controlling flow access, whereby a potential allowed transmission power for said data flow on said carrier is determined.

58. The means for allocating resources among the multiple flows according to claim 57, wherein said data flow is policed using a first bucket to shape traffic on a per flow basis and said flow access is controlled using a second bucket to shape transmit traffic channel power on a per flow and per carrier basis.

59. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 57, wherein said means for policing data flow comprises:

means for allocating resources among multiple flows associated with at least one of said access terminal by determining a total available power for each flow, wherein said total available power includes a current power allocation for said flow and at least a portion of an accumulated power allocation for said flow.

60. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 57, wherein said means for controlling flow access comprises means for allocating resources using a grant.

61. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 57, wherein said means for controlling flow access comprises means for allocating resources autonomously for each said flow in each said assigned carrier.

62. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 57, wherein said means for selecting a carrier for said data flow comprises:

means for ranking said assigned carriers using a metric; and

means for allocating packets to said assigned carriers.

63. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 57, wherein said step of selecting a carrier for said data flow comprises:

water-filling power across all said assigned carriers when not data or power limited; and

transmitting across a subset of said assigned carriers when data or power limited.

64. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 57, wherein said step of selecting a carrier for said data flow comprises:

transmitting across a number of said assigned carriers in an E_b/N₀efficient mode.

65. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 57, wherein said means for selecting a carrier for said data flow comprises:

means for sending a carrier request message, whereby a number of said carrier may be increased.

66. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 57, wherein means for selecting a carrier for said data flow further comprises:

means for sending a carrier grant message, whereby an access node may increase, decrease or reassign said carrier.

67. The means for allocating resources among the multiple flows according to claim 60, wherein said allocating resources among the multiple flows allocating flow resources using a grant comprises:

means for receiving a grant message; and

means for setting said current power allocation for a corresponding said flow equal to a current power allocation grant in said grant message.

68. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 60, further comprising:

determining MAC parameters for said flows across said carriers; and

allocating said carriers to arriving of said flows in said means for allocating resources among multiple flows transmitted across multiple carriers'"'"'s active set sectors, whereby said means for allocating resources among multiple flows transmitted across multiple carriers achieves long term load balancing.

69. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 61, further comprising:

determining MAC parameters for said flows across said carriers; and

allocating said carriers to arriving of said flows in said means for allocating resources among multiple flows transmitted across multiple carriers'"'"'s active set sectors, whereby said means for allocating resources among multiple flows transmitted across multiple carriers achieves long term load balancing.

70. The means for allocating resources among the multiple flows according to claim 61, wherein said means for allocating resources autonomously comprise a means for using an estimate of a loading level to allocate resources.

71. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 62, wherein said metric comprises an average pilot transmit power in each assigned carrier, or a filtered reverse activity bit in each assigned carrier, or a combination of both said average transmit pilot power and said filtered reverse activity bit.

72. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 62, wherein said step of ranking assigned carriers using a metric further comprises maximizing a number of bits transmitted per unit power by first allocating power to said carriers with lower interference.

73. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 62, wherein said step of ranking assigned carriers using a metric further comprises indirectly measuring an interference seen by the access terminal on each said assigned carrier by measuring a transmit pilot power or a reverse activity bit.

74. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 62, further comprising allocating said packets on a per packet basis, whereby the means for allocating resources among multiple flows transmitted across multiple carriers achieves short term load balancing.

75. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 65, further comprising means for sending a carrier grant message, whereby an access node may increase, decrease or reassign assigned carriers.

76. The means for allocating resources among multiple flows transmitted across multiple carriers according to claim 65, wherein said carrier request comprises flow requirements, queue length and power headroom information.

77. The means for allocating resources among the multiple flows according to claim 67, further comprising a means for sending a request message when a request interval increases above a threshold value.

78. The means for allocating resources among the multiple flows according to claim 67, further comprising a means for sending a request message when a request ratio decreases below a certain threshold value.

79. The means for allocating resources among the multiple flows according to claim 67, further comprising means for determining said grant for a subset of means for allocating resources among multiple flows transmitted across multiple carriers, wherein said grant includes a current power allocation grant.

80. The means for allocating resources among the multiple flows according to claim 67, wherein said grant message includes a holding period for at least one said current power allocation grant and an accumulated power allocation grant for said at least one said flow.

81. The means for allocating resources among the multiple flows according to claim 68, wherein said means for autonomously using an estimate of a loading level to determine a current power allocation for a flow comprises:

means for determining a value of said estimate associated with said flow;

means for determining whether said estimate is equal to a busy value;

means for decreasing said current power allocation if said estimate is equal to a busy value; and

means for increasing said current power allocation if said estimate is equal to an idle value.

82. The means for allocating resources among the multiple flows according to claim 79, further comprising means for determining current power allocations for means for allocating resources among multiple flows transmitted across multiple carriers not part of said subset autonomously.

83. The means for allocating resources among the multiple flows according to claim 79, wherein said current power allocation grant includes an estimate of a steady-state value for said current power allocation for at least one said flow for at least one of said means for allocating resources among multiple flows transmitted across multiple carriers.

84. The means for allocating resources among the multiple flows according to claim 81, further comprising:

means for calculating a magnitude of a decrease of said current power allocation using a downward ramping function; and

means for calculating a magnitude of an increase using an upward ramping function.