Managing configurations
To manage a power coordination configuration when performing a dual active protocol stack (DAPS) procedure, a UE receives ( 702 A), from a radio access network (RAN), a power coordination configuration for application by the UE to constrain uplink power when communicating with a source cell and a target cell of the RAN, initiates ( 704 A) the DAPS procedure in accordance with the power coordination configuration, and in response to detecting a trigger condition, releases ( 706 A) the power coordination configuration.
1 . A method in a user equipment (UE) for managing a power coordination configuration when performing a dual active protocol stack (DAPS) procedure, the method comprising:
receiving, by the UE and from a radio access network (RAN), a power coordination configuration for application by the UE to constrain uplink power when communicating with a source cell and a target cell of the RAN;
initiating, by the UE, the DAPS procedure in accordance with the power coordination configuration; and
in response to detecting a failure when performing the DAPS procedure, releasing, by the UE, the power coordination configuration and disconnecting from the source cell.
2 . The method of claim 1 , further comprising connecting, by the UE, to the target cell when performing the DAPS procedure.
3 . The method of claim 1 , further comprising receiving, by the UE from the RAN and via the target cell, an indication that the UE is to release the power coordination configuration.
4 . The method of claim 1 , wherein the failure includes a failure of the UE to connect to the target cell when performing the DAPS procedure.
5 . The method of claim 1 , further comprising re-establishing a radio connection between the UE and the RAN.
6 . The method of claim 4 , further comprising transmitting, by the UE to the RAN via the source cell, an indication that the UE failed to connect to the target cell.
7 . The method of claim 1 , wherein the DAPS procedure is a DAPS handover procedure or a DAPS primary secondary cell (PSCell) change procedure.
8 . A method in a RAN for managing a power coordination configuration when performing a dual active protocol stack (DAPS) procedure with a UE, the method comprising:
determining, by the RAN, that the UE is to perform the DAPS procedure to connect to a target cell and disconnect from a source cell after connecting to the target cell in accordance with the power coordination configuration;
transmitting, by the RAN to the UE, the power coordination configuration for application by the UE to constrain uplink power when communicating with the source cell and the target cell; and
in response to receiving, by the RAN and from the UE, an information message about a failure while performing the DAPS procedure, causing the source cell to release the power coordination configuration.
9 . The method of claim 8 , wherein the RAN transmits the power coordination configuration to the UE in a handover command message or a RRC container message.
10 . The method of claim 8 , wherein the DAPS procedure is a DAPS handover procedure or a DAPS primary secondary cell (PSCell) change procedure.
11 . A base station configured to provide a power coordination configuration to a UE that performs a dual active protocol stack (DAPS) procedure in a radio access network (RAN), the base station comprising:
a Radio Resource Control (RRC) controller; and
a RAN interface,
the RRC controller being configured:
to determine that the UE is to perform the DAPS procedure for connecting to a target cell of the RAN and then disconnecting from a source cell of the RAN;
to transmit, to the UE via the RAN interface, a power coordination configuration to be applied by the UE thereby constraining an uplink power when communicating with the source cell and the target cell; and
in response to receiving, from the UE, an information message about a failure while performing the DAPS procedure, cause the source cell to release the power coordination configuration.
12 . A User Equipment (UE) configured to manage power according to a power coordination configuration when performing a dual active protocol stack (DAPS) procedure in a radio access network (RAN), the UE comprising:
a Radio Resource Control (RRC) controller; and
a RAN interface,
the RRC controller being configured to:
receive, from the radio access network (RAN) via the RAN interface, a power coordination configuration to be used by the UE during the DAPS procedure thereby constraining uplink power while communicating with a source cell and a target cell of the RAN;
initiate the DAPS procedure for connecting to the target cell and disconnecting from the source cell while applying the power coordination configuration; and
in response to a detection of a failure when performing the DAPS procedure, release the power coordination configuration and disconnect from the source cell.
13 . The UE of claim 12 , wherein the failure includes
the UE failing to connect to the target cell when performing the DAPS procedure.
14 . The UE of claim 12 , wherein the RRC controller is further configured to perform at least one of:
transmit, using the RAN interface and via the source cell, an indication that the UE failed to connect to the target cell; or
re-establish a radio connection between the UE and the RAN.
15 . The UE of claim 12 , wherein the DAPS procedure is a DAPS handover procedure or a DAPS primary secondary cell (PSCell) change procedure.
16 . The UE of claim 12 , further comprising a computer-readable medium storing machine-readable instructions that, when executed by the RRC controller, cause the RRC controller to:
receive, from the RAN, the power coordination configuration for application by the UE to constrain the uplink power while communicating, via one or more RRC controllers, with the source cell and the target cell of the RAN;
initiate the dual active protocol stack (DAPS) procedure in accordance with the power coordination configuration; and
in response to the detection of the failure when performing the DAPS procedure, release the power coordination configuration.