Device and method of handling network slice information

A network for handling network slice information,

• comprising:
• a storage device;
• and
• a processing circuit, coupled to the storage device, wherein the storage device stores, and the processing circuit is configured to execute instructions of:
• establishing a radio resource control (RRC) connection to a communication device;
• receiving a RRCConnectionSetupComplete message comprising the network slice information from the communication device;
• transmitting a first RRC message on the RRC connection to the communication device, wherein the first RRC message suspends the RRC connection or configures the communication device to enter a RRC_INACTIVE state;
• performing a RRC connection resume procedure with the communication device to transfer the communication device to a RRC_CONNECTED state from the RRC_INACTIVE state;
• and
• receiving a second RRC message of the RRC connection resume procedure from the communication device, wherein the second RRC message comprises the network slice information.

A method for handling network slice information of a communication device, comprising:

• entering a RRC_CONNECTED state and establishing a radio resource control (RRC) connection to a network;
• transmitting a RRCConnectionSetupComplete message comprising the network slice information to the network;
• receiving a first RRC message on the RRC connection from the network, wherein the first RRC message suspends the RRC connection or configures the communication device to enter a RRC_INACTIVE state;
• performing a RRC connection resume procedure with the network to resume the RRC connection or transferring to the RRC_CONNECTED state from the RRC_INACTIVE state;
• and
• transmitting a second RRC message of the RRC connection resume procedure to the network, wherein the second RRC message comprises the network slice information.