System and method to provide uplink interference coordination in a network environment

• US 9,826,408 B2
• Filed: 12/07/2015
• Issued: 11/21/2017
• Est. Priority Date: 12/07/2015
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Madan, Ritesh K., Nabar, Rohit Umesh
• Primary Examiner(s): PHUONG, DAI
• Application Number:
  US14/961,552
• Publication Number:
  US 20170164206A1
• Time in Patent Office: 715 Days
• Field of Search: 4554321-453, 4554561-4563, 370328-334
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 28/0236 radio quality, e.g. interference, losses or delay
• CPC Class Codes: H04W 28/04 Error control

Abstract

A method is provided in one example embodiment and may include determining for each of one or more macro cell radios, a corresponding set of one or more small cell radios that are under a coverage area of each of the one or more macro cell radios, wherein each corresponding set is associated with a corresponding macro cell radio; calculating interference coordination parameters for each small cell radio belonging to each corresponding set, wherein the interference coordination parameters for each small cell radio belonging to each corresponding set comprises an uplink interference budget for each small cell radio; and communicating the interference coordination parameters to each small cell radio belonging to each corresponding set.

Claims

1. A method comprising:

determining, for each of one or more macro cell radios, a corresponding set of one or more small cell radios that are under a coverage area of the respective macro cell radio, wherein each corresponding set is associated with a corresponding macro cell radio;

calculating interference coordination parameters for each small cell radio belonging to each corresponding set, wherein the interference coordination parameters for each small cell radio comprise an uplink interference budget for the respective small cell radio, wherein for each of one or more particular small cell radios belonging to a particular set associated with a particular corresponding macro cell radio, calculating interference coordination parameters comprises;

determining, for a predetermined range of total average uplink interference budget values for the particular corresponding macro cell radio;

(i) an optimum total average uplink interference budget value for the particular corresponding macro cell radio; and

(ii) an optimum average interference budget value for each particular small cell radio that corresponds to a combination of;

(A) a maximized total utility of uplink user equipment throughput for user equipment served by the particular corresponding macro cell radio; and

(B) a maximized total utility of uplink user equipment throughput for user equipment served by the respective particular small cell radio; and

communicating the interference coordination parameters to each small cell radio belonging to each corresponding set.

2. The method of claim 1, wherein the interference coordination parameters for each small cell radio belonging to each corresponding set further comprise:

a maximum uplink interference level that can be caused towards a corresponding macro cell radio associated with a corresponding set for any uplink resource block to be transmitted by user equipment served by each small cell radio belonging to each corresponding set.

3. The method of claim 1, wherein a particular uplink interference budget for a particular small cell radio belonging to a particular set associated with a particular corresponding macro cell radio indicates an average uplink interference budget that can be caused toward the particular corresponding macro cell radio by user equipment served by the particular small cell radio.

4. The method of claim 1, further comprising:

receiving one or more interference budget parameters from each of the one or more macro cell radios.

5. The method of claim 4, wherein particular interference budget parameters received for a particular macro cell radio include one or more of:

an identity of one or more small cell radios considered to be within a coverage area of the particular macro cell radio;

an average interference caused to one or more small cell radios considered to be within a coverage area of the particular macro cell radio;

measurement report information reported to the particular macro cell radio by one or more user equipment served by the particular macro cell radio;

a total sum of utility of uplink user equipment throughput rates for one or more user equipment served by the particular macro cell radio; and

a maximum interference that can be caused toward the particular macro cell radio for any uplink resource block transmitted by one or more user equipment served by one or more small cell radios considered to be within a coverage area of the particular macro cell radio.

6. The method of claim 1, further comprising:

receiving utility feedback information from each small cell radio belonging to each set, wherein the utility feedback information received for a particular small cell radio includes at least one of;

a range of maximized utility values corresponding to a range of candidate average interference budget values that can be set for the small cell radio for each of a macro cell radio that the particular small cell radio is considered to be under; and

a range of marginal utility values based on a range of maximized utility values calculated for each of a given macro cell radio that the particular small cell radio is considered to be under.

7. The method of claim 1, further comprising:

determining, for each total average uplink interference budget value for the particular corresponding macro cell radio, an optimum distribution of a corresponding total average uplink interference budget value across each of the one or more particular small cell radios based, at least in part, on marginal values associated with the respective particular small cell radio.

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, for each of one or more macro cell radios, a corresponding set of one or more small cell radios that are under a coverage area of the respective macro cell radio, wherein each corresponding set is associated with a corresponding macro cell radio;

calculating interference coordination parameters for each small cell radio belonging to each corresponding set, wherein the interference coordination parameters for each small cell radio comprise an uplink interference budget for the respective small cell radio, wherein for each of one or more particular small cell radios belonging to a particular set associated with a particular corresponding macro cell radio, calculating interference coordination parameters comprises;

determining, for a predetermined range of total average uplink interference budget values for the particular corresponding macro cell radio;

(i) an optimum total average uplink interference budget value for the particular corresponding macro cell radio; and

(ii) an optimum average interference budget value for each particular small cell radio that corresponds to a combination of;

(A) a maximized total utility of uplink user equipment throughput for user equipment served by the particular corresponding macro cell radio; and

(B) a maximized total utility of uplink user equipment throughput for user equipment served by the respective particular small cell radio; and

communicating the interference coordination parameters to each small cell radio belonging to each corresponding set.

9. The media of claim 8, wherein the interference coordination parameters for each small cell radio belonging to each corresponding set further comprise:

a maximum uplink interference level that can be caused towards a corresponding macro cell radio associated with a corresponding set for any uplink resource block to be transmitted by user equipment served by each small cell radio belonging to each corresponding set.

10. The media of claim 8, wherein a particular uplink interference budget for a particular small cell radio belonging to a particular set associated with a particular corresponding macro cell radio indicates an average uplink interference budget that can be caused toward the particular corresponding macro cell radio by user equipment served by the particular small cell radio.

11. The media of claim 8, wherein the execution causes the processor to perform further operations, comprising:

receiving one or more interference budget parameters from each of the one or more macro cell radios.

12. The media of claim 11, wherein particular interference budget parameters received for a particular macro cell radio include one or more of:

an identity of one or more small cell radios considered to be within a coverage area of the particular macro cell radio;

an average interference caused to one or more small cell radios considered to be within a coverage area of the particular macro cell radio;

measurement report information reported to the particular macro cell radio by one or more user equipment served by the particular macro cell radio;

a total sum of utility of uplink user equipment throughput rates for one or more user equipment served by the particular macro cell radio; and

a maximum interference that can be caused toward the particular macro cell radio for any uplink resource block transmitted by one or more user equipment served by one or more small cell radios considered to be within a coverage area of the particular macro cell radio.

13. The media of claim 8, wherein the execution causes the processor to perform further operations, comprising:

receiving utility feedback information from each small cell radio belonging to each set, wherein the utility feedback information received for a particular small cell radio includes at least one of;

a range of maximized utility values corresponding to a range of candidate average interference budget values that can be set for the small cell radio for each of a macro cell radio that the particular small cell radio is considered to be under; and

a range of marginal utility values based on a range of maximized utility values calculated for each of a given macro cell radio that the particular small cell radio is considered to be under.

14. The media of claim 8, wherein the execution causes the processor to perform further operations, comprising:

determining, for each total average uplink interference budget value for the particular corresponding macro cell radio, an optimum distribution of a corresponding total average uplink interference budget value across each of the one or more particular small cell radios based, at least in part, on marginal values associated with the respective particular small cell radio.

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, for each of one or more macro cell radios, a corresponding set of one or more small cell radios that are under a coverage area of the respective macro cell radio, wherein each corresponding set is associated with a corresponding macro cell radio;

calculating interference coordination parameters for each small cell radio belonging to each corresponding set, wherein the interference coordination parameters for each small cell radio comprise an uplink interference budget for the respective small cell radio, wherein for each of one or more particular small cell radios belonging to a particular set associated with a particular corresponding macro cell radio, calculating interference coordination parameters comprises;

determining, for a predetermined range of total average uplink interference budget values for the particular corresponding macro cell radio;

(i) an optimum total average uplink interference budget value for the particular corresponding macro cell radio; and

(ii) an optimum average interference budget value for each particular small cell radio that corresponds to a combination of;

(A) a maximized total utility of uplink user equipment throughput for user equipment served by the particular corresponding macro cell radio; and

(B) a maximized total utility of uplink user equipment throughput for user equipment served by the respective particular small cell radio; and

communicating the interference coordination parameters to each small cell radio belonging to each corresponding set.

16. The system of claim 15, wherein a particular uplink interference budget for a particular small cell radio belonging to a particular set associated with a particular corresponding macro cell radio indicates an average uplink interference budget that can be caused toward the particular corresponding macro cell radio by user equipment served by the particular small cell radio.

17. The system of claim 15, wherein the executing causes the system to perform further operations, comprising:

determining, for each total average uplink interference budget value for the particular corresponding macro cell radio, an optimum distribution of a corresponding total average uplink interference budget value across each of the one or more particular small cell radios based, at least in part, on marginal values associated with the respective particular small cell radio.

18. The system of claim 15, wherein the interference coordination parameters for each small cell radio belonging to each corresponding set further comprise:

a maximum uplink interference level that can be caused towards a corresponding macro cell radio associated with a corresponding set for any uplink resource block to be transmitted by user equipment served by each small cell radio belonging to each corresponding set.

19. The system of claim 15, wherein the executing causes the system to perform further operations, comprising:

receiving one or more interference budget parameters from each of the one or more macro cell radios.

20. The system of claim 19, wherein particular interference budget parameters received for a particular macro cell radio include one or more of:

an identity of one or more small cell radios considered to be within a coverage area of the particular macro cell radio;

an average interference caused to one or more small cell radios considered to be within a coverage area of the particular macro cell radio;

measurement report information reported to the particular macro cell radio by one or more user equipment served by the particular macro cell radio;

a total sum of utility of uplink user equipment throughput rates for one or more user equipment served by the particular macro cell radio; and

a maximum interference that can be caused toward the particular macro cell radio for any uplink resource block transmitted by one or more user equipment served by one or more small cell radios considered to be within a coverage area of the particular macro cell radio.