Method of radio bearer establishment in dual connectivity

A method of radio bearer establishment in dual connectivity, for a first base station in a wireless communication system, comprising:

• receiving a request message including information of at least a radio bearer to be released or established on the first base station, from a second base station of the wireless communication system;
• transmitting a response message including information of accepting or rejecting establishment or release for the at least a radio bearer on the first base station, to the second base station, wherein the response message includes information of at least one of identities of radio bearers to be accepted or rejected to be established or released, release acknowledgement, information related to configuration of radio bearers on the first base station, and information related to connection setup to the first base station;
• and
• activating or releasing at least a radio bearer established on the first base station according to a notification message received from the second base station, wherein the notification message includes information of the at least a radio bearer to be activated or released on the first base station.

A first base station of a wireless communication system for radio bearer establishment in dual connectivity, the first base station comprising:

• a storage unit for storing instructions of:
• connecting to a communication device of the wireless communication system;
• determining whether to establish or release at least a radio bearer for the communication device on at least a second base station;
• and
• transmitting a request message including information of the at least a radio bearer to be established or released on the at least a second base station, to the at least a second base station;
• receiving a response message including information about accepting or rejecting establishment or release for the at least a radio bearer on the at least a second base station, from the at least a second base station, wherein the response message includes information of at least one of identities of radio bearers to be accepted or rejected to be established or released, release acknowledgement, information related to configuration of radio bearers on the at least a second base station, and information related to connection setup to the at least a second base station;
• and
• selecting one or more than one of the at least a second base station to establish or release the at least a radio bearer according to the response message;
• and
• a processing means, coupled to the storage unit, configured to execute the instructions stored in the storage unit.

A first base station of a wireless communication system for radio bearer establishment in dual connectivity, the first base station comprising:

• a storage unit for storing instructions of:
• receiving a request message including information of at least a radio bearer to be released or established on the first base station, from a second base station of the wireless communication system;
• transmitting a response message including information of accepting or rejecting establishment or release for the at least a radio bearer on the first base station, to the second base station, wherein the response message includes information of at least one of identities of radio bearers to be accepted or rejected to be established or released, release acknowledgement, information related to configuration of radio bearers on the first base station, and information related to connection setup to the first base station;
• and
• activating or releasing at least a radio bearer established on the first base station according to a notification message received from the second base station wherein the notification message includes information of the at least a radio bearer to be activated or released on the first base station;
• and
• a processing means, coupled to the storage unit, configured to execute the instructions stored in the storage unit.