METHOD AND APPARATUS FOR ENCODING RAN PARAMETERS OVER E2 INTERFACE USING E2SM-RC FOR TRAFFIC STEERING-BASED SLA OPTIMIZATION UPON CELL SHUTDOWN FOR ENERGY SAVINGS ACTIVATION
A method of implementing an optimal handover of a user equipment (UE) in an Open Radio Access Network (O-RAN) system from a first serving cell subject to a shutdown to an optimal target cell for the UE before executing the shutdown includes: providing an event trigger style for an event trigger used to trigger an event in an E2 node of the O-RAN system when a configuration change is ongoing within the E2 node, wherein the event trigger style is provided as radio intelligent controller (RIC) Event Trigger Definition information element (IE) Style Type 5; sending the event trigger from the E2 node to a near-real time (near-RT) RIC; and sending, by the near-RT RIC, a control message to the E2 node to implement the optimal handover of the UE to the optimal target cell for the UE.
1 . A method of implementing an optimal handover of a user equipment (UE) in an Open Radio Access Network (O-RAN) system from a first serving cell subject to a shutdown to an optimal target cell for the UE before executing the shutdown, comprising:
providing an event trigger style for an event trigger used to trigger an event in an E2 node of the O-RAN system when a configuration change is ongoing within the E2 node, wherein the event trigger style is provided as radio intelligent controller (RIC) Event Trigger Definition information element (IE) Style Type 5;
sending the event trigger from the E2 node to a near-real time (near-RT) RIC; and
sending, by the near-RT RIC, a control message to the E2 node to implement the optimal handover of the UE to the optimal target cell for the UE.
2 . The method of claim 1 , further comprising:
providing, by the E2 node of the O-RAN system, at least one of performance measurement data, trace data, and configuration management data to a non-real time (non-RT) RIC; and
sending, by the non-RT RIC to the E2 node of the O-RAN system, a cell shutdown message containing information regarding the first serving cell to be shut down.
3 . The method according to claim 2 , wherein:
the E2 node comprises at least an O-RAN centralized unit control plane (O-CU-CP), and the E2 node sends the event trigger to the near-RT RIC in response to the cell shutdown message sent by the non-RT RIC.
4 . The method according to claim 3 , further comprising:
sending, by the near-RT RIC to the E2 node, an E2 CONTROL message to handover the UE from the first serving cell to the optimal target cell; and
sending, by the E2 node to the near-RT RIC, an E2 CONTROL acknowledgement (ACK) message in response to the E2 CONTROL message.
5 . The method according to claim 4 , further comprising:
sending, by the O-CU-CP to an O-RAN distributed unit (O-DU), a handover message for handover of the UE to the optimal target cell; and
sending, by the O-DU to the O-CU-CP, a UE Context Modification acknowledgement (ACK) message.
6 . The method according to claim 5 , further comprising:
sending, by the O-CU-CP to the O-DU, a CU-CP Configuration Update message for cell shutdown of the first serving cell.
7 . The method according to claim 1 , wherein:
RIC Event Trigger Definition IE Style type 5 is used to detect a configuration process in the E2 node based on a specific configuration process type identifier and a configuration process breakpoint identifier associated with the configuration.
8 . The method according to claim 2 , wherein:
RIC Event Trigger Definition IE Style type 5 is used to detect a configuration process in the E2 node based on a specific configuration process type identifier and a configuration process breakpoint identifier associated with the configuration.
9 . The method according to claim 7 , wherein:
the configuration process type identifier comprises an identifier for E2 node cell state update process type; and
the configuration process breakpoint identifier comprises at least one of i) an identifier for cell shutdown within the E2 node, and ii) an identifier for cell resumption within the E2 node.
10 . The method according to claim 8 , wherein:
the configuration process type identifier comprises an identifier for E2 node cell state update process type; and
the configuration process breakpoint identifier comprises at least one of i) an identifier for cell shutdown within the E2 node, and ii) an identifier for cell resumption within the E2 node.
11 . The method according to claim 7 , further comprising:
providing an E2 Service Model for RAN Control (E2SM-RC) Event Trigger Definition Format 6 to reflect the configuration process breakpoint represented by the configuration process breakpoint identifier.
12 . The method according to claim 7 , further comprising:
providing a RIC Action Definition information element (IE) Format 4, wherein: i) a UE Group Definition IE, and ii) a RAN Parameters for Context Information IE are included in the RIC Action Definition IE Format 4.
13 . The method according to claim 7 , further comprising:
providing an E2 Service Model for RAN Control (E2SM-RC) Indication Message Format 6 information element (IE), wherein; i) a UE Identifier associated with the UE subject to the handover to the optimal target cell, and ii) network contextual information for the UE are included in the E2SM-RC Indication Message Format 6 IE.
14 . The method according to claim 7 , further comprising:
providing an E2 Service Model for RAN Control (E2SM-RC) Control Message Format 2 information element (IE), wherein a UE Identifier associated with the UE subject to the handover to the optimal target cell is included in the E2SM-RC Control Message Format 2 IE.
15 . The method according to claim 7 , further comprising:
providing an E2 Service Model for RAN Control (E2SM-RC) Control Outcome Format 2 information element (IE), wherein a UE Identifier associated with the UE subject to the handover to the optimal target cell is included in the E2SM-RC Control Outcome Format 2 IE.
16 . The method according to claim 7 , further comprising:
providing RAN Function Definition for EVENT TRIGGER Definition information element (IE) for enabling the E2 node to specify its capability of handling E2 node configuration process breakpoint-related events, wherein the RAN Function Definition for EVENT TRIGGER Definition IE includes at least one of the following information fields: i) Sequence of E2 Node Configuration Process Types; ii) Sequence of Configuration Process Breakpoints; and iii) Sequence of Associated RAN Parameters.