Secure L1/L2 centric inter-cell mobility execution
In general, the current subject matter relates to secure layer 1/layer 2 (L1/L2) centric inter-cell mobility execution. In some implementations, secure L1/L2 centric inter-cell mobility execution can include mapping a physical cell identifier (PCI) of at least one L1/L2 triggered mobility (LTM) target cell of at least one target distributed unit (DU) of a base station that is a candidate for handover (HO) for a user equipment (UE) to an index, and securely transmitting the mapping from a centralized unit control plane (CU-CP) of the base station to the UE and to a serving DU of the base station that is currently serving the UE for at least one service.
1. An apparatus, comprising:
at least one processor; and
at least one non-transitory storage media storing instructions that, when executed by the at least one processor, cause the at least one processor to perform operations comprising:
mapping a physical cell identifier (PCI) of at least one layer 1/layer 2 triggered mobility (LTM) target cell of at least one target distributed unit (DU) of a base station that is a candidate for handover (HO) for a user equipment (UE) to an index; and
securely transmitting the mapping from a centralized unit control plane (CU-CP) of the base station to the UE and to a serving DU of the base station that is currently serving the UE for at least one service.
2. The apparatus of claim 1 , wherein the index for each of the at least one LTM targets cells is unique in the mapping such that each index is uniquely associated with one of the at least one LTM target cells by PCI.
3. The apparatus of claim 1 , wherein the operations further comprise securely transmitting the mapping from the CU-CP to a target DU including a one of the at least one LTM targets cells selected for the HO.
4. The apparatus of claim 1 , wherein the mapping is transmitted to the UE in a radio resource control (RRC) reconfiguration message; and
the mapping is transmitted to the serving DU in an F1 UE context modification request message.
5. The apparatus of claim 1 , wherein the operations further comprise:
updating the mapping in response to at least one of:
one of the at least one LTM targets cells being removed for the UE, and
one of the at least one LTM targets cells being replaced for the UE; and securely transmitting the updated mapping from the CU-CP to the UE and the serving DU.
6. The apparatus of claim 1 , wherein the operations further comprise:
mapping a PCI of at least one LTM target cell of the at least one target DU that is a candidate for HO for a second UE to an index such that a second mapping is created; and
securely transmitting the second mapping from the CU-CP to the second UE.
7. The apparatus of claim 1 , wherein the serving DU utilizes the index received from the CU-CP when transmitting an LTM HO command to the UE.
8. The apparatus of claim 1 , wherein each index is one of numerical, alphabetical, and alphanumeric.
9. The apparatus of claim 1 , wherein the operations further comprise storing the mapping in the at least one non-transitory storage media.
10. The apparatus of claim 1 , wherein the base station includes a Next Generation Radio Access network (NG-RAN) node.
11. The apparatus of claim 10 , wherein the NG-RAN node includes a gNodeB or a ng-eNodeB.
12. The apparatus of claim 1 , wherein the base station includes the at least one processor and the at least one non-transitory storage media.
13. The apparatus of claim 12 , wherein the CU-CP includes the at least one processor and the at least one non-transitory storage media.
14. At least one non-transitory storage media storing instructions that, when executed by at least one processor, cause the at least one processor to perform operations comprising:
mapping a physical cell identifier (PCI) of at least one layer 1/layer 2 triggered mobility (LTM) target cell of at least one target distributed unit (DU) of a base station that is a candidate for handover (HO) for a user equipment (UE) to an index; and
securely transmitting the mapping from a centralized unit control plane (CU-CP) of the base station to the UE and to a serving DU of the base station that is currently serving the UE for at least one service.
15. The non-transitory storage media of claim 14 , wherein the index for each of the at least one LTM targets cells is unique in the mapping such that each index is uniquely associated with one of the at least one LTM target cells by PCI.
16. The non-transitory storage media of claim 14 , wherein the operations further comprise securely transmitting the mapping from the CU-CP to a target DU including a one of the at least one LTM targets cells selected for the HO.
17. A computer-implemented method, comprising:
mapping a physical cell identifier (PCI) of at least one layer 1/layer 2 triggered mobility (LTM) target cell of at least one target distributed unit (DU) of a base station that is a candidate for handover (HO) for a user equipment (UE) to an index; and
securely transmitting the mapping from a centralized unit control plane (CU-CP) of the base station to the UE and to a serving DU of the base station that is currently serving the UE for at least one service.
18. The method of claim 17 , wherein the index for each of the at least one LTM targets cells is unique in the mapping such that each index is uniquely associated with one of the at least one LTM target cells by PCI.
19. The method of claim 17 , further comprising securely transmitting the mapping from the CU-CP to a target DU including a one of the at least one LTM targets cells selected for the HO.