Managing Network Slices in a Communications Network

1 . A method, performed by a domain manager of a radio access network (RAN), of managing network slices in a communications network, the method comprising:

determining a change in cell composition of the RAN;

determining neighbor cells, within the RAN, that are affected by the change in cell composition of the RAN;

determining a set of RAN resource partitions that are affected by the change in cell composition of the RAN; and

adapting configurations of the RAN resource partitions of the affected set by introducing changes corresponding to the change in cell composition of the RAN,

wherein a configuration of a RAN resource partition defines the network elements of the RAN that are assigned to the RAN resource partition of a network slice.

2 . The method of claim 1 , wherein:

determining the change in cell composition comprises determining an addition of a new cell to the RAN;

determining neighbor cells within the RAN affected by the change in cell composition comprises determining a set of cells of the RAN that are neighbor cells of the new cell;

determining the set of RAN resource partitions affected by the change in cell composition comprises determining a set of RAN resource partitions that includes RAN resource partitions to which neighbor cells of the affected set are assigned; and

adapting the configurations of RAN resource partitions of the affected set comprises assigning a network element of the new cell to the configurations of the RAN resource partitions of the affected set.

3 . The method of claim 2 , wherein determining neighbor cells within the RAN affected by the change in cell composition comprises selecting all the cells of the RAN that are neighbor cells of the new cell.

4 . The method of claim 2 , wherein determining the set of RAN resource partitions affected by the change in cell composition comprises selecting all RAN resource partitions to which neighbor cells of the affected set are assigned.

5 . The method of claim 2 , wherein adapting the configurations of RAN resource partitions of the affected set comprises assigning a network element of the new cell to the configurations of all RAN resource partitions in the affected set.

6 . The method of claim 1 , wherein:

determining the change in cell composition of the RAN comprises the domain manager determining a removal of an unwanted cell from the RAN;

determining neighbor cells within the RAN affected by the change in cell composition comprises determining a set of neighbor cells of the unwanted cell;

determining the set of RAN resource partitions affected by the change in cell composition comprises determining a set of RAN resource partitions that include the unwanted cell; and

adapting the configurations of RAN resource partitions of the affected set comprises assigning a network element of the set of neighbor cells, of the unwanted cell, to the configurations of the RAN resource partitions of the affected set.

7 . The method of claim 6 , wherein determining neighbor cells within the RAN affected by the change in cell composition comprises selecting all cells of the RAN that are neighbor cells of the unwanted cell.

8 . The method of claim 6 , wherein determining the set of RAN resource partitions affected by the change in cell composition comprises selecting all RAN resource partitions that include the unwanted cell.

9 . The method of claim 6 , wherein adapting the configurations of RAN resource partitions of the affected set comprises assigning a network element of each neighbor cell of the set of neighbor cells to the configuration of each RAN resource partition.

10 . The method of claim 1 , wherein determining the neighbor cells and the set of RAN resource partitions affected by the change, and adapting the configurations of RAN resource partitions, are performed in response to receiving a trigger from a cell administration function.

11 . The method of claim 1 , further comprising:

receiving reports indicating an amount of traffic, of the network slice in an observation time window, handled by a network element assigned to a configuration of a RAN resource partition of the affected set; and

based on the reports, adapting the configuration of the RAN resource partition by removing the network element from the configuration of the RAN resource partition.

12 . A domain manager for a Radio Access Network (RAN) of a communications network, the domain manager comprising:

processing circuitry and a memory containing instructions executable by said processing circuitry whereby said domain manager is operative to:

determine a change in cell composition of the RAN;

determine neighbor cells, within the RAN, that are affected by the change in cell composition of the RAN;

determine a set of RAN resource partitions that are affected by the change in cell composition of the RAN; and

adapt configurations of the RAN resource partitions of the affected set by introducing changes corresponding to the change in cell composition of the RAN,

wherein a configuration of a RAN resource partition defines the network elements of the RAN that are assigned to the RAN resource partition of a network slice.

13 . The domain manager of claim 12 , wherein the domain manager is further operable, based on execution of the instructions by the processing circuitry, to:

determine the change in cell composition by determining an addition of a new cell to the RAN;

determine neighbor cells within the RAN affected by the change in cell composition by determining a set of cells of the RAN that are neighbor cells of the new cell;

determine the set of RAN resource partitions affected by the change in cell composition by determining a set of RAN resource partitions that includes RAN resource partitions to which neighbor cells of the affected set are assigned; and

adapt the configurations of RAN resource partitions of the affected set by assigning a network element of the new cell to the configurations of the RAN resource partitions of the affected set.

14 . The domain manager of claim 13 , wherein the domain manager is further operable, based on execution of the instructions by the processing circuitry, to determine neighbor cells within the RAN affected by the change in cell composition by selecting all cells of the RAN that are neighbor cells of the new cell.

15 . The domain manager of claim 13 , wherein the domain manager is further operable, based on execution of the instructions by the processing circuitry, to determine the set of RAN resource partitions affected by the change in cell composition by selecting all RAN resource partitions to which neighbor cells of the affected set are assigned.

16 . The domain manager of claim 13 , wherein the domain manager is further operable, based on execution of the instructions by the processing circuitry, to adapt the configurations of RAN resource partitions of the affected set by assigning a network element of the new cell to the configurations of all RAN resource partitions in the affected set.

17 . The domain manager of claim 12 , wherein the domain manager is further operable, based on execution of the instructions by the processing circuitry, to:

determine the change in cell composition of the RAN by determining a removal of an unwanted cell from the RAN;

determine neighbor cells within the RAN affected by the change in cell composition by determining a set of neighbor cells of the unwanted cell;

determine a set of RAN resource partitions affected by the change in cell composition by determining a set of RAN resource partitions that include the unwanted cell; and

adapt the configurations of RAN resource partitions of the affected set by assigning a network element of the set of neighbor cells, of the unwanted cell, to the configurations of the RAN resource partitions of the affected set.

18 . The domain manager of claim 17 , wherein the domain manager is further operable, based on execution of the instructions by the processing circuitry, to determine neighbor cells within the RAN affected by the change in cell composition by selecting all cells of the RAN that are neighbor cells of the unwanted cell.

19 . The domain manager of claim 12 , wherein the domain manager is further operable, based on execution of the instructions by the processing circuitry, to:

receive reports indicating an amount of traffic, of the network slice in an observation time window, handled by a network element assigned to a configuration of a RAN resource partition of the affected set; and

based on the reports, adapt the configuration of the RAN resource partition by removing the network element from the configuration of the RAN resource partition.

20 . A non-transitory, computer-readable medium storing computer-executable instructions that, when executed by processing circuitry, cause a domain manager of a radio access network (RAN) to perform operations corresponding to the method of claim 1 .