CA2404055A1 - A method of controlling transmission in a communications system using power back-off factors - Google Patents

A method of controlling transmission in a communications system using power back-off factors Download PDF

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Publication number
CA2404055A1
CA2404055A1 CA002404055A CA2404055A CA2404055A1 CA 2404055 A1 CA2404055 A1 CA 2404055A1 CA 002404055 A CA002404055 A CA 002404055A CA 2404055 A CA2404055 A CA 2404055A CA 2404055 A1 CA2404055 A1 CA 2404055A1
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channels
channel
factors
data
data transmissions
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CA2404055C (en
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Jay R. Walton
Mark Wallace
Jack Holtzman
Franklin P. Antonio
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Qualcomm Inc
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H04W52/244—Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/286—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission during data packet transmission, e.g. high speed packet access [HSPA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
    • H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information

Abstract

In some aspects, each cell in the communications system can be designed to operate in accordance with a set of back-off factors that identify the reductions in peak transmit power levels for the channels associated with the back-off factors. The back-off factors are defined to provide the required power to a large percentage of the users while reducing the amount of interference. In some other aspects, the cells operate using an adaptive reuse scheme that allows the cells to efficiently allocate and reallocate the system resources to reflect changes in the system. A reuse scheme is initially defined and resources are allocated to the cells. During operation, changes in the operating conditions of the system are detected and the reuse scheme is redefined as necessary based on the detected changes. For example, the loading conditions of the cells can be detected, and the resources can be reallocated and/or the reuse scheme can be redefined. In yet other aspects, techniques are provided to efficiency schedule data transmissions and to assign channels to users. Data transmissions can be scheduled based on user priorities, some fairness criteria, system requirements, and other factors. Users are assigned to available channels based on a number of channel assignment schemes. Channel metrics are also provided, which can be used to prioritize users and for channel assignments.

Claims (120)

1. A method for controlling transmissions in a communications system, the method comprising:

determining one or more characteristics of the communications system;
partitioning available system resources into a plurality of channels;
defining a plurality of back-off factors for the plurality of channels based at least in part on the determined one or more characteristics of the communications system, wherein each channel is associated with a respective back-off factor that identifies a reduction from peak transmit power level, and wherein each back-off factor ranges from zero to one; and transmitting on the plurality of channels at power levels determined based at least in part on the plurality of back-off factors.
2. The method of claim 1, wherein the available system resources are partitioned into a plurality of time division multiplexed (TDM) time slots, and wherein the plurality of channels correspond to defined sets of time slots.
3. The method of claim 1, wherein the available system resources are partitioned into a plurality of frequency division multiplexed (FDM) channels.
4. The method of claim 3, wherein the plurality of channels corresponds to sub-bands in an orthogonal frequency division multiplexing (OFDM) modulation system.
5. The method of claim 1, wherein the available system resources are partitioned into a plurality of code division multiple access (CDMA) channels.
6. The method of claim 1, wherein the determined one or more characteristics of the communications system include carrier-to-noise-plus-interference (C/I) characterization of receiver units in the communications system.
7. The method of claim 1, wherein the determined one or more characteristics of the communications system include loading probabilities for the communications system.
8. The method of claim 1, wherein the plurality of back-off factors are defined to approximately match the one or more determined characteristics of the communications system.
9. The method of claim 6, wherein the plurality of back-off factors are defined to approximately match the C/I characterization for the receiver units in the communications system.
10. The method of claim 1, wherein the plurality of back-off factors are defined based in part on required outage probabilities.
11. The method of claim 1, wherein the plurality of back-off factors are defined based in part on one or more set points selected for the plurality of channels, wherein each set point corresponds to a required C/I for a data transmission.
12. The method of claim 11, wherein the one or more set points are determined based in part on required outage probabilities.
13. The method of claim 11, wherein the one or more set points are determined based in part on required data rates of data transmissions on the plurality of channels.
14. The method of claim 1, further comprising:

estimating a required transmit power level for each of the plurality of channels;

adjusting the plurality of back-off factors based on the estimated required transmit power levels for the plurality of channels.
15. The method of claim 14, wherein the required transmit power level for a particular channel is estimated based on a C/I estimate of a data transmission on the particular channel.
16. The method of claim 15, wherein the required transmit power level for the particular channel is further estimated based on a data rate for the data transmission on the particular channel.
17. The method of claim 1, wherein at least one channel is associated with a back-off factor of one, representative of full transmit power, and remaining channels are associated with back-off factors of less than one.
18. The method of claim 1, wherein the plurality of back-off factors are dynamically defined to reflect changes in the communications system.
19. The method of claim 18, wherein the plurality of back-off factors are dynamically defined to reflect changes in performance requirements in the communications system.
20. The method of claim 1, wherein the plurality of back-off factors are adaptively defined to approximately match changes in the communications system.
21. The method of claim 20, wherein the plurality of back-off factors are adaptively defined to approximately match changes in characterization of receiver units in the communications system.
22. The method of claim 20, wherein the plurality of back-off factors are adaptively defined to approximately match changes in loading conditions in the communications system.
23. The method of claim 1, wherein one or more back-off factors are adjusted based on measured performance.
24. The method of claim 23, wherein the one or more back-off factors are adjusted based on estimated or measured C/I.
25. The method of claim 23, wherein the one or more back-off factors are adjusted based on measured frame erasure rates (FERs).
26. The method of claim 23, wherein the one or more back-off factors are adjusted based on estimated outage probabilities.
27. The method of claim 1, wherein one or more back-off factors are reduced for selected time durations to reduce interference.
28. The method of claim 1, wherein one or more back-off factors are set to zero for selected time durations to eliminate interference on one or more associated channels.
29. The method of claim 1, wherein the back-off factor of a particular channel is set to zero if performance of the particular channel is degraded below a particular threshold.
30. The method of claim 29, wherein the back-off factor of the particular channel is set to zero if a frame erasure rate (FER) exceeds a particular FER
threshold.
31. The method of claim 29, wherein the back-off factor of the particular channel is set to zero if an outage probability for the particular channel exceeds a particular value.
32. A method for controlling transmissions in a communications system, the method comprising:

defining a reuse pattern for the communications system, wherein the reuse pattern includes a plurality of cells;

determining one or more characteristics for each cell in the reuse pattern;

partitioning available system resources into a plurality of channels;

defining a plurality of back-off factors for the plurality of channels for each cell in the reuse pattern based at least in part on the determined one or more characteristics, wherein each channel of each cell is associated with a respective back-off factor that identifies a reduction from peak transmit power level, and wherein each back-off factor ranges from zero to one; and transmitting on the plurality of channels from the plurality of cells at power levels determined based at least in part on the associated back-off factors.
33. The method of claim 32, wherein the back-off factors for each cell in the reuse pattern are approximately staggered from those of neighboring cells in the reuse pattern.
34. The method of claim 32, further comprising:

estimating effective link margins for the plurality of channels for each cell in the reuse pattern; and redefining the back-off factors for each cell in the reuse pattern based on the estimated effective link margins.
35. The method of claim 34, wherein the estimating and redefining are performed iteratively until a set of conditions is satisfied.
36. The method of claim 34, wherein the estimating and redefining are performed iteratively until the effective link margins are within a particular threshold value.
37. The method of claim 32, further comprising:

at a particular cell, receiving one or more requests from one or more neighbor cells to reduce the back-off factor for a particular channel; and reducing the back-off factor for the particular channel in accordance with the one or more received requests.
38. The method of claim 37, wherein the back-off factor for the particular channel is reduced by the largest of requested reduction from the one or more neighbor cells.
39. The method of claim 32, wherein the back-off factors are applied at one or more time slots, or on one or more channels, or by one or more cells in the reuse pattern, or a combination thereof.
40. The method of claim 32, wherein the available system resources are partitioned into a plurality of time division multiplexed (Td) time slots, a plurality of frequency division multiplexed (FDM) channels, or a plurality of code division multiple access (CDMA) channels, and wherein the plurality of channels correspond to defined sets of TDM time slots, or the plurality of FDM
channels, or the plurality of CDMA channels, or a combination thereof.
41. The method of claim 32, wherein the determined one or more characteristics of the communications system include carrier-to-noise-plus-interference (C/I) characterization of receiver units in the communications system or loading probabilities for the communications system, or both.
42. The method of claim 32, wherein the plurality of back-off factors for each cell are defined based in part on C/I characterization for receiver units in the cell, one or more set points selected for the plurality of channels, required outage probabilities, or a combination thereof.
43. The method of claim 32, wherein one or more back-off factors for a particular cell are adjusted based on measured or estimated performance corresponding to measured frame erasure rates (FERs), outage probabilities, or C/Is, or a combination thereof.
44. The method of claim 32, wherein one or more back-off factors for a particular cell are adjusted by amounts related to measured C/I and set point.
45. The method of claim 32, wherein the back-off factors assigned to the plurality of cells are modified to reduce co-channel interference.
46. The method of claim 32, wherein each of the plurality of cells is designated a respective set of time intervals in which data transmissions are allowed.
47. The method of claim 32, wherein the back-off factors are associated with sectors in a sectorized cell.
48. A method for operating a plurality of transmitter units in a wireless communications system, the method comprising:

partitioning available system resources into a plurality of channels;

defining a reuse pattern for the communications system, wherein the reuse pattern includes a plurality of cells;

determining one or more characteristics for each cell in the reuse pattern;

allocating a set of channels to each cell in the reuse pattern based at least in part on the determined one or more characteristics for the cell; and repeating the determining and allocating to reflect changes in the communications system.
49. The method of claim 48, wherein each cell in the reuse pattern is allocated a respective set of channels for transmission at full power level.
50. The method of claim 48, wherein each cell in the reuse pattern is allocated a respective set of channels that includes one or more channels available for transmission at full power level and one or more channels available for transmission at reduced power levels.
51. The method of claim 48, wherein the sets of channels allocated to the cells are determined based in part on the number of available channels and the number of cells in the reuse pattern.
52. The method of claim 48, wherein the sets of channels allocated to the cells are determined based in part on estimated loading conditions in the cells.
53. The method of claim 48, wherein each cell in the reuse pattern is allocated a respective set of channels that are orthogonal to those allocated to other cells in the reuse pattern.
54. The method of claim 48, wherein one or more channels allocated to a particular cell are transmitted at reduced power to reduce interference.
55. The method of claim 54, wherein reduction in power is performed in defined steps.
56. The method of claim 48, wherein one or more channels allocated to a particular cell are temporarily prohibited from transmitting to reduce interference.
57. The method of claim 48, wherein a particular cell transmits on a non-allocated channel for a transmission demand not supportable by the capacity of the allocated set of channels.
58. The method of claim 57, wherein the non-allocated channel is selected based on an estimated performance of the selected channel.
59. The method of claim 58, wherein the non-allocated channel is selected based on an estimated probability of occupancy of the selected channel by neighbor cells.
60. The method of claim 58, wherein the non-allocated channel is selected based on an estimated carrier-to-interference-plus-noise (C/I) achievable on the selected channel.
61. The method of claim 58, wherein the non-allocated channel is selected based on an estimated outage probability for the selected channel.
62. The method of claim 57, wherein one or more channels are reserved for transmissions by a particular cell for a particular time duration.
63. The method of claim 62, wherein neighbor cells are prohibited from transmission on the one or more reserved channels for the particular time duration.
64. The method of claim 48, wherein the transmit power of each allocated channel is limited to a range of power levels when the allocated channel is transmitting.
65. The method of claim 48, wherein the determining and allocating are performed periodically.
66. The method of claim 48, wherein the determining and allocating are performed upon receiving an indication of changes in the communications system.
67. The method of claim 48, wherein the reuse pattern includes three or more cells.
68. The method of claim 48, wherein the available system resources are partitioned into 12 or more channels.
69. A method for providing data transmissions to a plurality of receiver units in a communications system, the method comprising:

defining a reuse scheme to be used for the data transmissions to the plurality of receiver units, wherein the defined reuse scheme identifies a particular reuse pattern, an initial allocation of available system resources, and a set of operating parameters;

transmitting to the plurality of receiver units in accordance with the defined reuse scheme;

evaluating performance of the communications system;

determining whether the evaluated system performance is within particular thresholds; and if the evaluated system performance is not within the particular thresholds, redefining the reuse scheme.
70. The method of claim 69, wherein the defining the reuse scheme includes:

characterizing one or more parameters of the communications system, and defining a reuse plan based at least in part on the one or more characterized parameters, wherein the reuse plan identifies the particular reuse pattern and an initial cell reuse layout based on the particular reuse pattern.
71. The method of claim 70, wherein characterizing includes determining an interference characterization for the plurality of receiver units in the communications system.
72. The method of claim 70, wherein the one or more parameters are updated periodically to reflect changes in the communications system.
73. The method of claim 70, wherein the defining the reuse scheme further includes:

partitioning the available system resources into a plurality of channels, and allocating a set of channels to each cell in the cell reuse layout based at least in part on the one or more characterized parameters.
74. The method of claim 73, wherein the characterizing includes determining expected probabilities of occupancy for the set of channels allocated to each cell.
75. The method of claim 74, wherein the expected probabilities of occupancy are set to one for uncharacterized channels.
76. The method of claim 73, wherein the defining the reuse scheme further includes:

defining a set of back-off factors to be associated with each allocated set of channels.
77. The method of claim 73, wherein the set of operating parameters includes a set of back-off factors fox each allocated set of channels.
78. The method of claim 69, further comprising receiving an indication of changes in the communications system; and redefining reuse scheme in response to the received indication of changes in the communications system.
79. The method of claim 69, wherein the evaluating includes determining effective link margins, frame erasure rates (FERs), outage probabilities, or average throughputs, or a combination thereof, for a particular cell.
80. A method for providing data transmissions to a plurality of receiver units in a communications system, the method comprising:

updating a first set of parameters to be used for scheduling the data transmissions;

prioritizing the data transmissions;

assigning the data transmissions to respective available channels based at least in part on priorities of the data transmissions;

updating a second set of parameters to be used for transmitting the data transmissions; and transmitting on the assigned channels to the plurality of receiver units using the updated second set of parameters.]
81. The method of claim 80, wherein the first set of parameters channel occupancy probabilities, loading probabilities, characterization of carrier-to-interference-plus-noise (C/I) of the receiver units, or back-off factors, or a combination thereof.
82. The method of claim 80, wherein the prioritizing includes computing channel metrics for the available channels for each receiver unit using the updated first set of parameters.
83. The method of claim 82, wherein the channel metrics relate to cumulative throughput.
84. The method of claim 83, wherein the cumulative throughput is determined based on realizable or actual data rates.
85. The method of claim 83, wherein the cumulative throughput is determined as a sliding average of realizable or actual data rates over a particular time interval.
86. The method of claim 82, wherein the channel metrics relate to outage probabilities.
87. The method of claim 82, wherein the channel metrics relate to expected achievable carrier-to-interference-plus-noise (C/I).
88. The method of claim 82, wherein the channel metrics is reflective of interference constraint matrices indicative of interference expected from interfering sources.
89. The method of claim 82, wherein the prioritizing further includes assigning priorities to the data transmissions based in part on the computed channel metrics.
90. The method of claim 89, wherein the prioritizing further includes upgrading priority of a particular data transmission based at least in part on delays experienced by the data transmission.
91. The method of claim 89, wherein the assigning the data transmissions to respective available channels is achieved base in part on the assigned priorities of the data transmissions and the computed channel metrics.
92. The method of claim 91, wherein successively lower priority data transmissions are assigned to the available channels, starting with the highest priority data transmission.
93. The method of claim 91, wherein successively smaller load data transmissions are assigned to the available channels, starting with the highest load data transmission.
94. The method of claim 80, further comprising:

measuring performance of one or more data transmissions; and adjusting transmit power levels for the one or more data transmissions based on the measured performance.
95. The method of claim 94, wherein the transmit power levels for the one or more data transmissions are adjusted based on measure frame erasure rate (FER) of the one or more data transmissions.
96. The method of claim 80, further comprising:

estimating required transmit power for a particular data transmission;

and adjusting a data rate of the particular data transmission based at least in part on the estimated required transmit power.
97. The method of claim 80, wherein the assigning is achieved to approximately equalize data rates for the data transmissions.
98. The method of claim 97, wherein the equalized data rates are achieved by assigning two or more channels to data transmissions transmitted at lower data rates.
99. A method for providing data transmissions on a plurality of channels to a plurality of receiver units in a communications system, the method comprising:

computing channel metrics for the plurality of channels for each receiver unit;

prioritizing the data transmissions;

assigning data transmissions to the plurality of channels based on priorities of the data transmissions and the computed channel metrics, wherein the assigning includes selecting a data transmission having a highest priority, assigning the selected data transmission to a channel having a least favorable channel metrics but meeting requirements, and successively assigning remaining data transmissions, in order of decreasing priorities, to available channels; and transmitting on the assigned channels to the plurality of receiver units.
100. The method of claim 99, further comprising:

upgrading one or more data transmissions to available channels having more favorable channel metrics.
101. The method of claim 100, wherein the upgrading includes selecting a data transmission having a highest priority;

selecting a channel, from a list of available channels, having a most favorable channel metrics; and reassigning the selected data transmission to the selected channel if the channel metrics associated with the selected channel is more favorable than the channel metrics associated with the original assigned channel.
102. A method for providing data transmissions on a plurality of channels to a plurality of receiver units in a communications system, the method comprising:

defining a plurality of back-off factors for the plurality of channels, wherein the back-off factors identify reduction from peak transmit power level for the respective channels;

assigning the data transmissions to the plurality of channels;

determining required transmit power levels for the data transmissions;

adjusting the plurality of back-off factors in accordance with the determined required transmit power levels; and transmitting the data transmissions on the plurality of channels in accordance with the plurality of adjusted back-off factors.
103. The method of claim 102, wherein the adjusting the plurality of back-off factors is performed prior to the transmitting.
104. The method of claim 102, further comprising:

measuring performance of one or more data transmissions; and adjusting transmit power levels for the one or more data transmissions based on the measured performance.
105. The method of claim 102, wherein the assigning the data transmissions to the plurality of channels is performed based in part on priorities of the data transmissions.
106. The method of claim 102, further comprising;

computing channel metrics for the data transmissions based at least in part on the plurality of back-off factors, and wherein the assigning the data transmissions to the plurality of channels is performed based in part on the computed channel metrics.
107. The method of claim 102, further comprising;

prioritizing the data transmissions, and wherein the assigning the data transmissions to the plurality of channels is performed based m part on priorities of the data transmissions.
108. The method of claim 107, wherein priorities of the data transmissions relate to achievable C/I.
109. The method of claim 107, wherein priorities of the data transmissions relate to realizable or actual cumulative throughput.
110. The method of claim 107, wherein data transmissions having higher priorities are considered earlier in the assigning.
111. The method of claim 107, further comprising;

upgrading priority of a particular data transmission based on one or more parameters.
112. The method of claim 102, wherein the back-off factors are defined in accordance with one or more one or more characteristics of the communications system.
113. A transmitter unit in a communications system comprising:

a system data processor operative to receive and partition an input data stream into a plurality of channel data streams and to process the plurality of channel data streams;

one or more modulators coupled to the system data processor and operative to receive and modulate the plurality of processed channel data streams to generate one or more modulated signals comprising a plurality of data transmissions to be transmitted on a plurality of channels to a plurality of receiver units, wherein each channel is associated with a respective back-off factor, ranging from zero to one, that identifies a reduction from peak transmit power level; and one or more antennas coupled to the one or more modulators and operative to receive and transmit the one or more modulated signals.
114. The transmitter unit of claim 113, wherein the back-off factors for the plurality of channels are determined based on C/I characterization or loading of the communications system.
115. The transmitter unit of claim 113, wherein the one or more modulators is operative to implement orthogonal frequency division multiplexing (OFDM) modulation.
116. A transmitter unit in a communications system comprising:

a resource allocation processor operative to receive data defining a reuse scheme to be used for data transmissions to a plurality of receiver units, wherein the defined reuse scheme identifies a particular reuse pattern, an initial allocation of available system resources, and a set of operating parameters;

a system data processor coupled to the resource allocation processor and operative to receive and partition an input data stream into a plurality of channel data streams and to process the plurality of channel data streams in accordance with the defined reuse scheme;

one or more modulators coupled to the system data processor and operative to receive and modulate the plurality of processed channel data streams to generate one or more modulated signals comprising the plurality of data transmissions to be transmitted on a plurality of channels to a plurality of receiver units; and one or more antennas coupled to the one or more modulators and operative to receive and transmit the one or more modulated signals.
117. The transmitter unit of claim 116, wherein the resource allocation processor is further operative to evaluate performance of the communications system;

determine whether the evaluated system performance is within particular thresholds, and if the evaluated system performance is not within the particular thresholds, redefine the reuse scheme.
118. A transmitter unit in a communications system comprising:

a resource allocation processor operative to receive a first set of parameters to be used for scheduling data transmissions;

a system data processor coupled to the resource allocation processor and operative to receive and partition an input data stream into a plurality of channel data streams and to process the plurality of channel data streams in accordance with the first set of parameters, wherein the plurality of channel data streams are prioritized and assigned to a plurality of channels based at least in part on priorities of the data streams;

one or more modulators coupled to the system data processor and operative to receive and modulate the plurality of processed channel data streams in accordance with a second set of parameters to generate one or more modulated signals comprising a plurality of data transmissions to be transmitted on the plurality of channels to a plurality of receiver units, wherein the second set of parameters includes a set of back-off factors for the plurality of channels; and one or more antennas coupled to the one or more modulators and operative to receive and transmit the one or more modulated signals.
119. A transmitter unit in a communications system comprising:

a system data processor operative to receive and partition an input data stream into a plurality of channel data streams, process the plurality of channel data streams, and assign the processed channel data streams to a plurality of channels;

one or more modulators coupled to the system data processor and operative to receive and modulate the plurality of processed channel data streams to generate one or more modulated signals comprising a plurality of data transmissions to be transmitted on the plurality of channels, determine transmit power levels for the plurality of data transmissions based at least in part on power constraints on the plurality of channels, and adjust power levels associated with the plurality of channels in accordance with the determined transmit power levels; and one or more antennas coupled to the one or more modulators and operative to receive and transmit the one or more modulated signals.
120. A receiver unit in a communications system comprising:
one or more antennas operative to receive one or more modulated signals that have been generated and transmitted by partitioning an input data stream into a plurality of channel data streams, processing and modulating the plurality of channel data streams to generate one or more modulated signals comprising a plurality of data transmissions to be transmitted on a plurality of channels, and adjusting power levels of the plurality of data transmissions in accordance with a set of back-off factors associated with the plurality of channels, wherein each back-off factor identifies a reduction from peak transmit power level;

one or more demodulators coupled to the one or more antennas and operative to receive and demodulate the one or more modulated signals to generate one or more demodulate symbol streams; and a data processor coupled to the one or more demodulators and operative to receive and process the one or more demodulate symbol streams to generate output data.
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