Method for performing bearer type change of a plurality of bearers configured for user equipment
Example embodiments provide a method and system for performing a bearer type change of a plurality of radio bearers configured for a User Equipment (UE) including changing the bearer type of a specific bearer by the network and checking any changes in keys, packet data convergence protocol (PDCP) termination point, or PDCP version change. Furthermore, the UE is notified to change the bearer type either through a reconfiguration procedure without handover, a secondary node (SN) change procedure or reconfiguration procedure with handover, or a SN change procedure. The network indicates one or more operations to the UE for performing the bearer type change.
1. A method performed by a user equipment (UE) comprising an evolved UMTS terrestrial radio access (E-UTRA) radio link control (RLC) entity and a new radio (NR) RLC entity configured with E-UTRA-NR dual connectivity (EN-DC) in a wireless communication system, the method comprising:
identifying information indicating to change a bearer type of a configured radio bearer for the UE, from a master cell group (MCG) RLC entity to a secondary cell group (SCG) RLC entity;
re-establishing the MCG RLC entity and releasing the MCG RLC entity; and
establishing the SCG RLC entity,
wherein the MCG RLC entity is associated with the E-UTRA RLC entity and the SCG RLC entity is associated with the NR RLC entity.
2. The method of claim 1 , wherein a type of a bearer configured for the UE is changed from a master node (MN) terminated bearer to a secondary node (SN) terminated bearer with change of a packet data convergence protocol (PDCP) termination point, and
wherein a medium access control (MAC) entity corresponding to the SCG RLC entity is not reset.
3. A method performed by a user equipment (UE) comprising an evolved UMTS terrestrial radio access (E-UTRA) radio link control (RLC) entity and a new radio (NR) RLC entity, configured with E-UTRA-NR dual connectivity (EN-DC) in a wireless communication system, the method comprising:
identifying information indicating to change a bearer type of a configured radio bearer for the UE from a secondary cell group (SCG) RLC entity to a master cell group (MCG) RLC entity;
releasing the SCG RLC entity; and
establishing the MCG RLC entity,
wherein the MCG RLC entity is associated with the E-UTRA RLC entity and the SCG RLC entity is associated with the NR RLC entity.
4. A method performed by a user equipment (UE) comprising an evolved UMTS terrestrial radio access (E-UTRA) radio link control (RLC) entity and a new radio (NR) RLC entity, configured with E-UTRA-NR dual connectivity (EN-DC) in a wireless communication system, the method comprising:
identifying one or more information indicating to change a bearer type of a configured radio bearer for the UE from a split RLC entity to a master cell group (MCG) RLC entity; and
(i) reconfiguring a logical channel identity associated with a second RLC entity by re-establishing and reconfiguring the first RLC entity to the second RLC entity with a new RLC configuration, or (ii) reconfiguring the logical channel identity by releasing the first RLC entity and establishing the second RLC entity.
5. The method of claim 4 , wherein a type of a bearer configured for the UE is changed from a master node (MN) terminated bearer to a secondary node (SN) terminated bearer with change of a packet data convergence protocol (PDCP) termination point, and
wherein a medium access control (MAC) entity corresponding to the second RLC entity is not reset.
6. The method of claim 4 , further comprising:
reconfiguring the logical channel identity by re-establishing and reconfiguring the second RLC entity in a case where the second RLC entity is associated with an E-UTRAN node, and
reconfiguring the logical channel identity by releasing the first RLC entity and establishing the second RLC entity in a case where the second RLC entity is associated with an NR node.