Radio access network node, user equipment, and methods thereof
AssigneeNEC Corporation
InventorsHisashi Futaki, Sadafuku Hayashi
Life of this patent
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Abstract
A master node (1) requests a conditional PSCell addition (CPA), via an SN ADDITION REQUEST message (301), to a candidate secondary node (2). The master node (1) also requests the candidate secondary node (2) to configure an SN terminated MCG bearer via the SN ADDITION REQUEST message (301). This can, for example, contribute to mitigating a communication continuity problem caused by a Conditional PSCell Addition (CPA) failure.
Claims17
A first Radio Access Network (RAN) node configured to operate as a master node associated with a Master Cell Group (MCG) in dual connectivity for a User Equipment (UE), the first RAN node comprising:
- at least one memory;
- and
- at least one processor coupled to the at least one memory and configured to:
- request a conditional Primary Secondary Cell (PSCell) addition, via an SN ADDITION REQUEST message, to a candidate secondary node;
- and
- request the candidate secondary node, via the SN ADDITION REQUEST message, to configure an SN terminated MCG bearer, the SN terminated MCG bearer being a radio bearer terminated at the candidate secondary node and using radio resources of the MCG but not using radio resources of a Secondary Cell Group (SCG) associated with the candidate secondary node,
- wherein the conditional PSCell addition requested by the SN ADDITION REQUEST message involves a bearer type change of the SN terminated MCG bearer to an SN terminated split bearer or an SN terminated SCG bearer.
A User Equipment (UE) comprising:
- at least one memory;
- and
- at least one processor coupled to the at least one memory and configured to:
- receive an MN Radio Resource Control (RRC) Reconfiguration message from a serving Radio Access Network (RAN) node, wherein the MN RRC Reconfiguration message contains an execution condition for a conditional Primary Secondary Cell (PSCell) addition, a radio bearer configuration of an SN terminated MCG bearer, and a Secondary Cell Group (SCG) configuration of an SCG including a candidate PSCell for the conditional PSCell addition;
- and
- establish the SN terminated MCG bearer and start evaluating the execution condition in response to receiving the MN RRC Reconfiguration message.
A method performed by a first Radio Access Network (RAN) node configured to operate as a master node associated with a Master Cell Group (MCG) in dual connectivity for a User Equipment (UE), the method comprising:
- requesting a conditional Primary Secondary Cell (PSCell) addition, via an SN ADDITION REQUEST message, to a candidate secondary node;
- and
- requesting the candidate secondary node, via the SN ADDITION REQUEST message, to configure an SN terminated MCG bearer, the SN terminated MCG bearer being a radio bearer terminated at the candidate secondary node and using radio resources of the MCG but not using radio resources of a Secondary Cell Group (SCG) associated with the candidate secondary node,
- wherein the conditional PSCell addition requested by the SN ADDITION REQUEST message involves a bearer type change of the SN terminated MCG bearer to an SN terminated split bearer or an SN terminated SCG bearer.
Dependencies are inferred from the claim text.