Systems and methods for dual-connectivity operation
A method for receiving a radio resource control (RRC) message by a user equipment (UE) is described. The method includes receiving an RRC connection reconfiguration (RRCConnectionReconfiguration) message including secondary cell group (SCG) configuration parameters. The RRC connection reconfiguration message has a structure that the SCG configuration parameters do not include a data radio bearer (DRB) configuration.
1. A method for receiving a radio resource control (RRC) message by a user equipment (UE), comprising:
receiving an RRC connection reconfiguration (RRCConnectionReconfiguration) message including secondary cell group (SCG) configuration parameters,
wherein a master cell group (MCG) and a SCG are configured for dual connectivity, a first Medium Access Control (MAC) entity is mapped to the MCG, a second Medium Access Control (MAC) entity is mapped to the SCG, the RRC connection reconfiguration message is exchanged via the MCG, the MCG comprises at least a primary cell (PCell), and the SCG comprises at least a primary secondary cell (PSCell),
wherein the RRC connection reconfiguration message has a structure to switch between a case that the SCG configuration parameters include a data radio bearer (DRB) configuration and a case that the SCG configuration parameters do not include a DRB configuration, wherein in the case that the SCG configuration parameters include a DRB configuration, a DRB corresponding to the DRB configuration is established to the SCG.
2. The method of claim 1 , wherein the SCG configuration parameters comprise a RadioResourceConfigDedicated information element for the SCG, wherein the RadioResourceConfigDedicated information element comprises at least one of a DRB configuration (drb-ToAddModList) and a MAC main configuration (mac-MainConfig).
3. A method for sending a radio resource control (RRC) message by an evolved Node B (eNB), comprising:
sending an RRC connection reconfiguration (RRCConnectionReconfiguration) message including secondary cell group (SCG) configuration parameters to a user equipment (UE),
wherein a master cell group (MCG) and a SCG are configured for dual connectivity, a first Medium Access Control (MAC) entity is mapped to the MCG, a second Medium Access Control (MAC) entity is mapped to the SCG, the RRC connection reconfiguration message is exchanged via the MCG, the MCG comprises at least a primary cell (PCell), and the SCG comprises at least a primary secondary cell (PSCell),
wherein the RRC connection reconfiguration message has a structure to switch between a case that the SCG configuration parameters include a data radio bearer (DRB) configuration and a case that the SCG configuration parameters do not include a DRB configuration, wherein in the case that the SCG configuration parameters include a DRB configuration, a DRB corresponding to the DRB configuration is established to the SCG.
4. A user equipment (UE) for receiving a radio resource control (RRC) message, comprising:
a processor; and
memory in electronic communication with the processor, wherein instructions stored in the memory are executable to:
receive an RRC connection reconfiguration (RRCConnectionReconfiguration) message including secondary cell group (SCG) configuration parameters,
wherein a master cell group (MCG) and a SCG are configured for dual connectivity, a first Medium Access Control (MAC) entity is mapped to the MCG, a second Medium Access Control (MAC) entity is mapped to the SCG, the RRC connection reconfiguration message is exchanged via the MCG, the MCG comprises at least a primary cell (PCell), and the SCG comprises at least a primary secondary cell (PSCell),
wherein the RRC connection reconfiguration message has a structure to switch between a case that the SCG configuration parameters include a data radio bearer (DRB) configuration and a case that the SCG configuration parameters do not include a DRB configuration, wherein in the case that the SCG configuration parameters include a DRB configuration, a DRB corresponding to the DRB configuration is established to the SCG.
5. An evolved Node B (eNB) for sending a radio resource control (RRC) message, comprising:
a processor; and
memory in electronic communication with the processor, wherein instructions stored in the memory are executable to:
send an RRC connection reconfiguration (RRCConnectionReconfiguration) message including secondary cell group (SCG) configuration parameters to a user equipment (UE),
wherein a master cell group (MCG) and a SCG are configured for dual connectivity, a first Medium Access Control (MAC) entity is mapped to the MCG, a second Medium Access Control (MAC) entity is mapped to the SCG, the RRC connection reconfiguration message is exchanged via the MCG, the MCG comprises at least a primary cell (PCell), the SCG comprises at least a primary secondary cell (PSCell),
wherein the RRC connection reconfiguration message has a structure to switch between a case that the SCG configuration parameters include a data radio bearer (DRB) configuration and a case that the SCG configuration parameters do not include a DRB configuration, wherein in the case that the SCG configuration parameters include a DRB configuration, a DRB corresponding to the DRB configuration is established to the SCG.