System and method for providing uplink inter cell interference coordination in a network environment

• US 9,839,035 B2
• Filed: 04/20/2015
• Issued: 12/05/2017
• Est. Priority Date: 04/14/2015
• Status: Expired due to Fees

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Madan, Ritesh K., Nabar, Rohit Umesh, Chandrasekhar, Vikram, Shirali, Kedar Durgadas
• Primary Examiner(s): Gidado, Rasheed
• Application Number:
  US14/691,260
• Publication Number:
  US 20160309476A1
• Time in Patent Office: 960 Days
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/0236 radio quality, e.g. interference, losses or delay
• CPC Class Codes: H04W 28/16 Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/1268 of uplink data flows
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

A method is provided in one example embodiment and may include determining one or more uplink inter cell interference coordination (ICIC) parameters for a plurality of cells based, at least in part, on feedback information associated with the plurality of cells; exchanging interference information between neighboring cells; and scheduling uplink transmissions for user equipment served by the neighboring cells based, at least in part, on the uplink ICIC parameters and the interference information exchanged between neighboring cells. A method is provided in another example embodiment and may include determining a ratio relating a first portion of a frequency spectrum for assigning fractional frequency re-use resources to a second portion of the frequency spectrum for assigning re-use one resources; and updating the ratio relating the first portion and the second portion of the frequency spectrum to optimize throughput rates for the plurality of user equipment across the plurality of cells.

Claims

1. A method comprising:

determining a ratio relating a first portion of a frequency spectrum in which fractional frequency re-use (FFR) resources are to be assigned to a second portion of the frequency spectrum in which re-use one resources are to be assigned, wherein the FFR resources and the re-use one resources are associated with uplink transmissions for a plurality of user equipment across a plurality of cells in a communication system;

updating the ratio relating the first portion and the second portion of the frequency spectrum to optimize throughput rates for the plurality of user equipment across the plurality of cells, wherein at least one of determining the ratio or updating the ratio includes maximizing a total sum of utilities of throughput rates for the user equipment across the plurality of cells for a particular utility function, wherein the maximizing further comprises;

calculating, by each cell of the plurality of cells, a per cell total sum of utilities for achievable throughput rates for a plurality of user equipment served by each cell for each of a plurality of possible values of the ratio;

communicating, by each cell of the plurality of cells, the per cell total sum of utilities for achievable throughput rates to a central management system for each of the plurality of possible values of the ratio;

calculating a total sum of utilities across the plurality of cells based on the per cell total sum of utilities for each of the plurality of possible values of the ratio;

determining, by the central management system, a maximum total sum of utilities and a particular value of the ratio associated with the maximum total sum of utilities; and

setting the ratio equal to the particular value of the ratio associated with the maximum total sum of utilities;

determining one or more uplink inter cell interference coordination (ICIC) parameters for the plurality of cells based on the ratio; and

scheduling uplink transmissions for user equipment served by the plurality of cells based, at least in part, on the uplink ICIC parameters.

2. The method of claim 1, wherein the particular utility function is based on one of:

a total sum of a logarithmic function of average throughput rates for the user equipment;

a total sum of a weighted exponential function of average throughput rates for the user equipment; and

a total sum of average throughput rates for the user equipment.

3. The method of claim 1, wherein calculating the per cell total sum of utilities for achievable throughput rates for the plurality of user equipment served by a particular cell further comprises:

calculating a weighted sum of throughput rates achievable for each user equipment served by the particular cell in relation to a number of resource blocks that can be allocated in a plurality of resource block regions of the frequency spectrum and wherein the number of resource blocks that can be allocated in one or more of the resource block regions is varied according to each of the plurality of possible values of the ratio; and

accumulating weighted sums of throughput rates achievable for all user equipment served by the particular cell according to each of the plurality of possible values of the ratio to determine a total sum of utility of throughput rates for all user equipment served by the cell for each of the plurality of possible values of the ratio.

4. The method of claim 1, wherein updating the ratio further comprises:

determining, by each cell of the plurality of cells, a first modulation and coding scheme (MCS) for each of a plurality of user equipment served by each cell in a first resource block region of the frequency spectrum.

5. The method of claim 4, further comprising:

determining, by each cell of the plurality of cells, a first number of resource blocks in the first resource block region assigned to user equipment that have a corresponding first MCS below a predetermined MCS threshold; and

determining, by each cell of the plurality of cells, a second number of resource blocks in a second resource block region assigned to user equipment that have a corresponding first MCS above the predetermined MCS threshold.

6. The method of claim 5, further comprising:

communicating, by each cell of the plurality of cells, the first number of resource blocks and the second number of resource blocks to a central management system;

increasing the ratio based on a determination that a low percentile of the first number of resource blocks communicated by each of the plurality of cells is below a first predetermined resource block threshold; and

reducing the ratio based on a determination that a high percentile of the second number of resource blocks communicated by each of the plurality of cells is above a second predetermined resource block threshold.

7. The method of claim 5, wherein the predetermined MCS threshold is associated with a predetermined signal-to-interference-noise ratio (SINR) associated with interference between neighboring cells of the plurality of cells in the communication system.

8. One or more non-transitory tangible media encoding logic that includes instructions for execution by a processor, wherein the execution causes the processor to perform operations, comprising:

determining a ratio relating a first portion of a frequency spectrum in which fractional frequency re-use (FFR) resources are to be assigned to a second portion of the frequency spectrum in which re-use one resources are to be assigned, wherein the FFR resources and the re-use one resources are associated with uplink transmissions for a plurality of user equipment across a plurality of cells in a communication system;

updating the ratio relating the first portion and the second portion of the frequency spectrum to optimize throughput rates for the plurality of user equipment across the plurality of cells, wherein at least one of determining the ratio or updating the ratio includes maximizing a total sum of utilities of throughput rates for the user equipment across the plurality of cells for a particular utility function, wherein the maximizing further comprises;

calculating, by each cell of the plurality of cells, a per cell total sum of utilities for achievable throughput rates for a plurality of user equipment served by each cell for each of a plurality of possible values of the ratio;

communicating, by each cell of the plurality of cells, the per cell total sum of utilities for achievable throughput rates to a central management system for each of the plurality of possible values of the ratio;

calculating a total sum of utilities across the plurality of cells based on the per cell total sum of utilities for each of the plurality of possible values of the ratio;

determining, by the central management system, a maximum total sum of utilities and a particular value of the ratio associated with the maximum total sum of utilities; and

setting the ratio equal to the particular value of the ratio associated with the maximum total sum of utilities;

determining one or more uplink inter cell interference coordination (ICIC) parameters for the plurality of cells based on the ratio; and

scheduling uplink transmissions for user equipment served by the plurality of cells based, at least in part, on the uplink ICIC parameters.

9. The media of claim 8, wherein calculating the per cell total sum of utilities for achievable throughput rates for the plurality of user equipment served by a particular cell further comprises:

calculating a weighted sum of throughput rates achievable for each user equipment served by the particular cell in relation to a number of resource blocks that can be allocated in a plurality of resource block regions of the frequency spectrum and wherein the number of resource blocks that can be allocated in one or more of the resource block regions is varied according to each of the plurality of possible values of the ratio; and

accumulating weighted sums of throughput rates achievable for all user equipment served by the particular cell according to each of the plurality of possible values of the ratio to determine a total sum of utility of throughput rates for all user equipment served by the cell for each of the plurality of possible values of the ratio.

10. The media of claim 8, wherein updating the ratio further comprises:

determining, by each cell of the plurality of cells, a first modulation and coding scheme (MCS) for each of a plurality of user equipment served by each cell in a first resource block region of the frequency spectrum.

11. The media of claim 10, wherein the execution causes the processor to perform further operations, comprising:

determining, by each cell of the plurality of cells, a first number of resource blocks in the first resource block region assigned to user equipment that have a corresponding first MCS below a predetermined MCS threshold; and

determining, by each cell of the plurality of cells, a second number of resource blocks in a second resource block region assigned to user equipment that have a corresponding first MCS above the predetermined MCS threshold.

12. The media of claim 11, wherein the execution causes the processor to perform further operations, comprising:

communicating, by each cell of the plurality of cells, the first number of resource blocks and the second number of resource blocks to a central management system;

increasing the ratio based on a determination that a low percentile of the first number of resource blocks communicated by each of the plurality of cells is below a first predetermined resource block threshold; and

reducing the ratio based on a determination that a high percentile of the second number of resource blocks communicated by each of the plurality of cells is above a second predetermined resource block threshold.

13. The media of claim 8, wherein the particular utility function is based on one of:

a total sum of a logarithmic function of average throughput rates for the user equipment;

a total sum of a weighted exponential function of average throughput rates for the user equipment; and

a total sum of average throughput rates for the user equipment.

14. The media of claim 11, wherein the predetermined MCS threshold is associated with a predetermined signal-to-interference-noise ratio (SINR) associated with interference between neighboring cells of the plurality of cells in the communication system.

15. A system comprising:

at least one memory element for storing data; and

at least one processor for executing instructions associated with the data, wherein the executing causes the system to perform operations, comprising;

determining a ratio relating a first portion of a frequency spectrum in which fractional frequency re-use (FFR) resources are to be assigned to a second portion of the frequency spectrum in which re-use one resources are to be assigned, wherein the FFR resources and the re-use one resources are associated with uplink transmissions for a plurality of user equipment across a plurality of cells in a communication system;

updating the ratio relating the first portion and the second portion of the frequency spectrum to optimize throughput rates for the plurality of user equipment across the plurality of cells, wherein at least one of determining the ratio or updating the ratio includes maximizing a total sum of utilities of throughput rates for the user equipment across the plurality of cells for a particular utility function, wherein the maximizing further comprises;

calculating, by each cell of the plurality of cells, a per cell total sum of utilities for achievable throughput rates for a plurality of user equipment served by each cell for each of a plurality of possible values of the ratio;

communicating, by each cell of the plurality of cells, the per cell total sum of utilities for achievable throughput rates to a central management system for each of the plurality of possible values of the ratio;

calculating a total sum of utilities across the plurality of cells based on the per cell total sum of utilities for each of the plurality of possible values of the ratio;

determining, by the central management system, a maximum total sum of utilities and a particular value of the ratio associated with the maximum total sum of utilities; and

setting the ratio equal to the particular value of the ratio associated with the maximum total sum of utilities;

determining one or more uplink inter cell interference coordination (ICIC) parameters for the plurality of cells based on the ratio; and

scheduling uplink transmissions for user equipment served by the plurality of cells based, at least in part, on the uplink ICIC parameters.

16. The system of claim 15, wherein calculating the per cell total sum of utilities for achievable throughput rates for the plurality of user equipment served by a particular cell further comprises:

calculating a weighted sum of throughput rates achievable for each user equipment served by the particular cell in relation to a number of resource blocks that can be allocated in a plurality of resource block regions of the frequency spectrum and wherein the number of resource blocks that can be allocated in one or more of the resource block regions is varied according to each of the plurality of possible values of the ratio; and

accumulating weighted sums of throughput rates achievable for all user equipment served by the particular cell according to each of the plurality of possible values of the ratio to determine a total sum of utility of throughput rates for all user equipment served by the cell for each of the plurality of possible values of the ratio.

17. The system of claim 15, wherein updating the ratio further comprises:

determining, by each cell of the plurality of cells, a first modulation and coding scheme (MCS) for each of a plurality of user equipment served by each cell in a first resource block region of the frequency spectrum.

18. The system of claim 17, wherein the executing causes the system to perform further operations, comprising:

determining, by each cell of the plurality of cells, a first number of resource blocks in the first resource block region assigned to user equipment that have a corresponding first MCS below a predetermined MCS threshold; and

determining, by each cell of the plurality of cells, a second number of resource blocks in a second resource block region assigned to user equipment that have a corresponding first MCS above the predetermined MCS threshold.

19. The system of claim 18, wherein the executing causes the system to perform further operations, comprising:

communicating, by each cell of the plurality of cells, the first number of resource blocks and the second number of resource blocks to a central management system;

increasing the ratio based on a determination that a low percentile of the first number of resource blocks communicated by each of the plurality of cells is below a first predetermined resource block threshold; and

reducing the ratio based on a determination that a high percentile of the second number of resource blocks communicated by each of the plurality of cells is above a second predetermined resource block threshold.

20. The system of claim 19, wherein the predetermined MCS threshold is associated with a predetermined signal-to-interference-noise ratio (SINR) associated with interference between neighboring cells of the plurality of cells in the communication system.