Coordinated multipoint set selection based on donor status

• US 10,237,759 B1
• Filed: 03/29/2017
• Issued: 03/19/2019
• Est. Priority Date: 03/29/2017
• Status: Active Grant

• Current Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Marupaduga, Sreekar
• Primary Examiner(s): Nowlin, Eric
• Application Number:
  US15/473,375
• Time in Patent Office: 720 Days
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• 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 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

Disclosed herein are methods and systems that can help to more effectively select a cooperating set of cells for coordinated multipoint (CoMP) service. One illustrative method involves: (a) determining a donor status of a first base station that serves a first cell, wherein the donor status indicates whether or not the first base station is configured as a donor base station for at least one relay node, and (b) based at least in part on the determined donor status of the first base station, determining whether or not to include the first cell in a CoMP cooperating set.

Claims

1. A method comprising:

determining a donor status of a first base station that serves a first cell, wherein the donor status indicates whether or not the first base station is configured as a donor base station for at least one relay node; and

based at least in part on the determined donor status of the first base station, determining whether or not to include the first cell in a coordinated multipoint (CoMP) cooperating set, wherein at least one UE is provided CoMP service by the CoMP cooperating set,

wherein, when the determined donor status indicates that the first base station is configured as a donor base station for at least one relay node, determining whether or not to include the first cell served in the CoMP cooperating set comprises omitting or removing the first cell from a CoMP measurement set.

2. The method of claim 1, wherein the CoMP measurement set is sent to at least one UE and indicates cells for which channel state information is requested from the UE to facilitate selection of the CoMP cooperating set.

3. The method of claim 1, further comprising omitting or removing any cell served by the first base station from the CoMP measurement set.

4. The method of claim 1, further comprising:

receiving a reporting set from a UE, wherein the reporting set comprises channel state information for one or more cells comprising at least the first cell, and wherein the reporting set is used as a basis for selecting the CoMP coordinating set;

wherein the determined donor status indicates that the first base station is configured as a donor base station for at least one relay node; and

wherein determining whether or not to include the first cell in the CoMP cooperating set comprises, responsive to the determination that the donor status indicates the first base station is configured as a donor base station, removing the first cell from the reporting set.

5. The method of claim 1, wherein determining whether or not to include the first base station in the cooperating set comprises:

if the determined donor status indicates the first base station is operating as a donor base station, then refraining from including the first base station in the cooperating set; and

if the determined donor status indicates the first base station is not operating as a donor base station, then including the first base station in the cooperating set.

6. The method of claim 1, wherein determining whether or not to include the first base station in the cooperating set comprises:

if the determined donor status indicates the first base station is operating as a donor base station, then refraining from including the first base station in the cooperating set; and

if the determined donor status indicates the first base station is not operating as a donor base station, then using one or more other factors as a basis for determining whether or not to include the first base station in the cooperating set.

7. A method comprising:

determining a set of candidate cells under consideration for inclusion in a coordinated multipoint (CoMP) cooperating set;

for each of one or more of the candidate cells, determining a donor status for a base station serving the candidate cell, wherein the donor status indicates whether or not the base station is configured as a donor base station for at least one relay node; and

using each determined donor status as a basis for determining whether to include the corresponding candidate cell in the CoMP cooperating set, wherein, when the determined donor status indicates that the corresponding base station is configured as a donor base station for at least one relay node, the corresponding candidate cell is not included in the CoMP cooperating set.

8. The method of claim 7, wherein determining the donor status for each of each of the one or more of the candidate cells comprises determining a respective number of relay nodes for which the base station serving the candidate cell also serves as a donor base station.

9. The method of claim 7, wherein determining the donor status for each of each of the one or more of the candidate cells comprises determining a total number of relay backhaul links via the candidate cell to the base station serving the candidate cell.

10. The method of claim 7, further comprising, receiving a CoMP reporting set from a user equipment (UE), wherein the CoMP reporting set comprises a plurality of cells, and wherein the set of candidate cells comprises the CoMP reporting set or a subset thereof.

11. The method of claim 10, wherein a determination is made that a first cell from reporting set is served by a base station configured as a donor base station for one or more relay nodes, and wherein using the respectively determined donor status for the one or more of the candidate cells as a basis for selecting one or more of the cells to include in the CoMP cooperating set comprises removing the first cell from the reporting set, such that the first cell is not included in the CoMP cooperating set.

12. The method of claim 7, further comprising, determining a CoMP measurement set for a user equipment (UE), wherein the CoMP measurement set comprises a plurality of cells, and wherein the set of candidate cells comprises the CoMP measurement set or a subset thereof.

13. The method of claim 12, wherein a determination is made that a first cell from the CoMP measurement set is served by a base station configured as a donor base station for one or more relay nodes, and wherein using the respectively determined donor status for the one or more of the candidate cells as a basis for selecting one or more of the cells to include in the CoMP cooperating set comprises removing the first cell from the CoMP measurement set, such that the first cell is not included in the CoMP cooperating set.

14. The method of claim 7, wherein determining the donor status for each of one or more of the candidate cells and using the respectively determined donor status for the one or more of the candidate cells as a basis for determining one or more candidate cells to include in the CoMP cooperating set comprises:

for each of one or more of the candidate cells;

(i) determining a donor status for the candidate cell; and

(ii) using the determined donor status as a basis for determining whether or not to include the candidate cell in the cooperating set.

15. The method of claim 14, further comprising using channel state information for each of the one or more of the candidate cells as a further basis for determining whether or not to include the candidate cell in the cooperating set.

16. The method of claim 7, wherein a respective donor status is determined for each two or more of the candidate cells, the method further comprising:

determining channel state information for each of the two or more of the candidate cells;

comparing the two or more candidate cells based on the respectively determined channel state information and the respectively determined donor status; and

wherein the determination of which candidate cells to include in the CoMP cooperating set is based at least in part on the comparison of the two more candidate cells.

17. A method comprising:

determining a set of candidate cells under consideration for inclusion in a coordinated multipoint (CoMP) cooperating set;

for each of one or more of the candidate cells, determining a donor status corresponding to the candidate cell, wherein the donor status indicates whether or not a relay backhaul link is established via the candidate cell; and

using the one or more determined donor statuses for the one or more of the candidate cells as a basis for determining one or more of the candidate cells to include in the CoMP cooperating set, wherein, when the determined donor status indicates for a given one of the candidate cells indicates that a relay backhaul link is established via the candidate cell, the given candidate cell is not included in the CoMP cooperating set.

18. The method of claim 17, wherein determining the donor status corresponding to a given one of the candidate cells comprises determining a total number of relay backhaul links established via the given candidate cell.

19. The method of claim 17, wherein determining the donor status corresponding to a given one of the candidate cells comprises determining whether a base station that serves the given candidate cell is configured as a donor base station for at least one relay node.

20. The method of claim 17, wherein the method is implemented by an eNodeB in an LTE network.