Communication system, control device, communication terminal, communication device, and communication method
In order to provide a communication system capable of charging control in accordance with a bearer used by a UE even when the UE performs dual connectivity, a communication system according to the present disclosure includes a communication terminal ( 11 ) configured to communicate with a communication device ( 12 ) and a communication device ( 13 ) by using a different radio bearer for each of the communication device ( 12 ) and the communication device ( 13 ), and a control device ( 14 ) configured to determine whether to cause the communication device ( 12 ) to measure the traffic of each radio bearer.
1. A method for a Mobility Management Entity (MME) comprising:
receiving an Attach Request message from a User Equipment (UE) during Attach procedure, the Attach Request message including first information indicating that the UE supports dual connectivity with a master base station providing Evolved Universal Terrestrial Radio Access (E-UTRA) and a secondary base station providing radio communication scheme in 5G;
deciding whether or not to restrict use of dual connectivity with the radio communication scheme in 5G for the UE, based on the first information and second information; and
sending an Attach Accept message to the UE during the Attach procedure, the Attach Accept message including the second information indicating whether use of dual connectivity with the radio communication scheme in 5G is restricted or not.
2. The method according to claim 1 further comprising:
performing a Secondary Node Addition procedure for providing resources from the secondary base station to the UE after the Attach procedure.
3. The method according to claim 1 further comprising:
selecting a Serving Gateway (SGW) during the Attach procedure if the MME has the first information and the second information indicates that the use of dual connectivity with the radio communication scheme in 5G is not restricted.
4. The method according to claim 1 , wherein the dual connectivity is E-UTRA-NR Dual Connectivity (EN-DC).
5. The method according to claim 1 , wherein the second information indicates the use of dual connectivity with the radio communication scheme in 5G is restricted by an Evolved Packet System (EPS) network or not.
6. A method for a master base station providing Evolved Universal Terrestrial Radio Access (E-UTRA), the method comprising:
receiving an Attach Request message from a User Equipment (UE);
sending the Attach Request message to a Mobility Management Entity (MME) during an Attach procedure, the Attach Request message including first information indicating that the UE supports dual connectivity with the master base station and a secondary base station providing radio communication scheme in 5G;
receiving an Attach Accept message from the MME;
sending the Attach Accept message to the UE during the Attach procedure, the Attach Accept message including second information indicating whether use of dual connectivity with the radio communication scheme in 5G is restricted or not; and
sending a RRC Connection Reconfiguration message to the UE during a Secondary Node Addition procedure for operating the dual connectivity with the master base station and the secondary base station, the RRC Connection Reconfiguration message being sent after sending the Attach Accept message.
7. The method according to claim 6 , wherein the dual connectivity is E-UTRA-NR Dual Connectivity (EN-DC).
8. The method according to claim 6 further comprising:
receiving a RRC Connection Reconfiguration Complete message from the UE during the Secondary Node Addition procedure.
9. The master base station according to claim 6 , wherein the second information indicates whether the use of dual connectivity with the radio communication scheme in 5G is restricted by an Evolved Packet System (EPS) network or not.