Serving noise/macro interference limited user equipment for downlink inter-cell interference coordination

• US 9,967,067 B2
• Filed: 09/08/2015
• Issued: 05/08/2018
• Est. Priority Date: 09/08/2015
• 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): Moore, Ian N
• Assistant Examiner(s): McCallum, Latresa
• Application Number:
  US14/848,026
• Publication Number:
  US 20170070323A1
• Time in Patent Office: 973 Days
• CPC Class Codes: H04B 1/10 Means associated with receiver for limiting or suppressing noise or interference
• CPC Class Codes: H04J 11/005 of intercell interference
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

An example method is provided in one example embodiment and includes receiving feedback information from at least one controlled cell indicative of interference received at one or more user equipment devices served by the at least one cell. The at least one controlled cell is controlled by an operator associated with the at least one controlled cell. The method further includes selecting one or more user equipment devices that is determined to have received interference from at least one non-controlled cell that is greater than a predetermined threshold. The at least one non-controlled cell is not controlled by the operator associated with the at least one controlled cell. The method still further includes determining a power level for a subset of common resources from among a set of common resources shared among the at least one controlled cell based upon the received feedback information.

Claims

1. A method, comprising:

receiving feedback information from at least one controlled cell indicative of interference received at one or more user equipment devices served by the at least one controlled cell, the at least one controlled cell being controlled by an operator associated with the at least one controlled cell;

selecting one or more user equipment devices that is determined to have received interference, from at least one non-controlled cell, that is greater than a predetermined threshold, the at least one non-controlled cell not being controlled by the operator associated with the at least one controlled cell; and

determining a power level for a subset of common resources, from among a set of common resources shared among the at least one controlled cell, based upon the received feedback information, wherein at least one of;

the power level and the subset of common resources is determined based upon performance criteria for user equipment devices determined to have received interference from the at least one non-controlled cell that is greater than the predetermined threshold.

2. The method of claim 1, further comprising sending an indication of the determined power level to the at least one controlled cell.

3. The method of claim 1, further comprising determining the subset of common resources based upon the feedback information.

4. The method of claim 3, further comprising sending an indication of the subset of common resources to the at least one controlled cell.

5. The method of claim 1, wherein the power level is determined based upon performance criteria for user equipment devices determined to have received interference from the at least one non-controlled cell that is greater than the predetermined threshold.

6. The method of claim 1, wherein the amount of interference at a user equipment device is determined based upon Reference Signal Received Power (RSRP) reports received from the at least one controlled cell.

7. The method of claim 1, wherein the subset of common resources is determined based upon performance criteria for user equipment devices determined to have received interference from the at least one non-controlled cell that is greater than the predetermined threshold.

8. The method of claim 1, wherein determining the power level for the subset of common resources includes determining a candidate power level for each of a plurality of signal-to-interference-plus-noise ratio (SINR) threshold values, and selecting an optimal SINR threshold value and corresponding power level from among the plurality of SINR threshold values and corresponding power levels using a predetermined selection criterion.

9. The method of claim 8, wherein the predetermined selection criterion includes maximizing a sum of log rates of user equipment devices for which non-controlled cell interference is not the dominant interferer.

10. The method of claim 8, wherein the predetermined selection criterion includes maximizing a sum of log rates for all user equipment devices of the one or more user equipment devices.

11. The method of claim 1, wherein the at least one controlled cell includes a small cell.

12. The method of claim 1, wherein the at least one non-controlled cell includes a macro cell.

13. One or more non-transitory tangible media that includes code for execution and when executed by a processor is operable to perform operations comprising:

receiving feedback information from at least one controlled cell indicative of interference received at one or more user equipment devices served by the at least one controlled cell, the at least one controlled cell being controlled by an operator associated with the at least one controlled cell;

selecting one or more user equipment devices that is determined to have received interference, from at least one non-controlled cell, that is greater than a predetermined threshold, the at least one non-controlled cell not being controlled by the operator associated with the at least one controlled cell; and

determining a power level for a subset of common resources, from among a set of common resources shared among the at least one controlled cell, based upon the received feedback information, wherein determining the power level for the subset of common resources includes determining a candidate power level for each of a plurality of signal-to-interference-plus-noise ratio (SINR) threshold values, and selecting an optimal SINR threshold value and corresponding power level from among the plurality of SINR threshold values and corresponding power levels using a predetermined selection criterion.

14. The media of claim 13, wherein the operations further comprise sending an indication of the determined power level to the at least one controlled cell.

15. The media of claim 13, wherein the operations further comprise determining the subset of common resources based upon the feedback information.

16. The media of claim 15, wherein the operations further comprise sending an indication of the subset of common resources to the at least one controlled cell.

17. The media of claim 13, wherein the power level is determined based upon performance criteria for user equipment devices determined to have received interference from the at least one non-controlled cell that is greater than the predetermined threshold.

18. The media of claim 17, wherein the amount of interference at a user equipment device is determined based upon Reference Signal Received Power (RSRP) reports received from the at least one controlled cell.

19. The media of claim 13, wherein the subset of common resources is determined based upon performance criteria for user equipment devices determined to have received interference from the at least one non-controlled cell that is greater than the predetermined threshold.

20. The media of claim 13, wherein the predetermined selection criterion includes maximizing a sum of log rates of user equipment devices for which non-controlled cell interference is not the dominant interferer.

21. The media of claim 13, wherein the predetermined selection criterion includes maximizing a sum of log rates for all user equipment devices of the one or more user equipment devices.

22. An apparatus, comprising:

a processor; and

a memory storing a program, which, when executed on the processor, performs an operation, the operation comprising;

receiving feedback information from at least one controlled cell indicative of interference received at one or more user equipment devices served by the at least one controlled cell, the at least one controlled cell being controlled by an operator associated with the at least one controlled cell;

selecting one or more user equipment devices that is determined to have received interference, from at least one non-controlled cell, that is greater than a predetermined threshold, the at least one non-controlled cell not being controlled by the operator associated with the at least one controlled cell; and

determining a power level for a subset of common resources, from among a set of common resources shared among the at least one controlled cell, based upon the received feedback information, wherein at least one of;

the power level and the subset of common resources is determined based upon performance criteria for user equipment devices determined to have received interference from the at least one non-controlled cell that is greater than the predetermined threshold.

23. The apparatus of claim 22, wherein the at least one module is further configured to send an indication of the determined power level to the at least one controlled cell.

24. The apparatus of claim 22, wherein the at least one module is further configured to determine the subset of common resources based upon the feedback information.

25. The apparatus of claim 24, wherein the at least one module is further configured to send an indication of the subset of common resources to the at least one controlled cell.

26. The apparatus of claim 22, wherein the power level is determined based upon performance criteria for user equipment devices determined to have received interference from the at least one non-controlled cell that is greater than the predetermined threshold.

27. The apparatus of claim 22, wherein the subset of common resources is determined based upon performance criteria for user equipment devices determined to have received interference from the at least one non-controlled cell that is greater than the predetermined threshold.

28. The apparatus of claim 22, wherein determining the power level for the subset of common resources includes determining a candidate power level for each of a plurality of signal-to-interference-plus-noise ratio (SINR) threshold values, and selecting an optimal SINR threshold value and corresponding power level from among the plurality of SINR threshold values and corresponding power levels using a predetermined selection criterion.