State transition method of wireless communication system
A state transition method of a wireless communication system is provided. A network transition request is transmitted by a wireless electronic device to a first base station of a first network. The network transition request includes an assistance information of the wireless communication device. A handover request including the assistance information is transmitted by the first base station to a second base station of a second network. A handover message is generated and transmitted by the second base station to the first base station in response to the handover request. A state transition message is generated and transmitted by the first base station to the wireless communication device in response to the handover message. The wireless communication device transitions from an RRC inactive state of the first network to a first state of the second network in response to the state transition message.
1. A state transition method of a wireless communication system, comprising:
transmitting, by a wireless communication device, a network transition request to a first base station of a first network when the wireless communication device is operated in an RRC inactive state of the first network, wherein the network transition request includes assistance information comprising a preferred RRC state of the wireless communication device, and the network transition request is an RRC connection resume message; and
transmitting, by the first base station, a handover request including the assistance information to a second base station of a second network in response to the network transition request;
generating and transmitting, by the second base station, a handover message to the first base station in response to the handover request;
generating and transmitting, by the first base station, a state transition message to the wireless communication device in response to the handover message; and
transitioning, by the wireless communication device, from the RRC inactive state of the first network to a first state of the second network in response to the state transition message;
wherein the first state is an RRC connected state when the state transition message is an RRC connection setup message, and the first state is an RRC idle state when the state transition message is an RRC connection rejection message.
2. The state transition method of claim 1 , wherein the assistance information includes a target base station.
3. The state transition method of claim 1 , wherein the assistance information includes a service type of the wireless communication device.
4. A wireless communication system, comprising:
a first base station connected to a first network
a second base station connected to a second network; and
a wireless communication device;
wherein:
the wireless communication device is configured to transmit a network transition request to the first base station when the wireless communication device is operated in an RRC inactive state of the first network, wherein the network transition request includes assistance information comprising a preferred RRC state of the wireless communication device, and the network transition request is an RRC connection resume message;
the first base station is configured to transmit a handover request including the assistance information to the second base station in response to the network transition request;
the second base station is configured to generate and transmit a handover message to the first base station in response to the handover request;
the first base station is further configured to generate and transmit a state transition message to the wireless communication device in response to the handover message; and
the wireless communication device is further configured to transition from the RRC inactive state of the first network to a first state of the second network in response to the state transition message;
wherein the first state is an RRC connected state when the state transition message is an RRC connection setup message, and the first state is an RRC idle state when the state transition message is an RRC connection rejection message.
5. The wireless communication system of claim 4 , wherein the assistance information includes a target base station.
6. The wireless communication system of claim 4 , wherein the assistance information includes a service type of the wireless communication device.
7. A wireless communication device, comprising:
a processor configured to:
transmit a network transition request to a first base station of a first network when the wireless communication device is operated in an RRC inactive state of the first network, wherein the network transition request includes assistance information comprising a preferred RRC state of the wireless communication device, and the network transition request is an RRC connection resume message;
receive a state transition message from the first base station, wherein the state transition message is generated by the first base station in response to a handover message received from a second base station of a second network and responding to the network transition request; and
transition from the RRC inactive state of the first network to a first state of a second network;
wherein the first state is an RRC connected state when the state transition message is an RRC connection setup message, and the first state is an RRC idle state when the state transition message is an RRC connection rejection message.
8. The wireless communication device of claim 7 , wherein the assistance information includes a target base station.
9. The wireless communication device of claim 7 , wherein the assistance information includes a service type of the wireless communication device.
10. A base station connected to a wireless communication device via a first network, comprising:
a processor configured to:
receive a network transition request from the wireless communication device when the wireless communication device is operated in an RRC inactive state of the first network, wherein the network transition request includes assistance information comprising a preferred RRC state of the wireless communication device, and the network transition request is an RRC connection resume message;
transmit a handover request including the assistance information to a second base station of a second network in response to the network transition request;
receive a handover message from the second base station, wherein the handover message is generated by the second base station in response to the handover request; and
generate and transmit a state transition message to the wireless communication device in response to the handover message;
wherein the wireless communication device transitions from the RRC inactive state of the first network to a first state of the second network when the wireless communication device receives the state transition message;
wherein the first state is an RRC connected state when the state transition message is an RRC connection setup message, and the first state is an RRC idle state when the state transition message is an RRC connection rejection message.
11. The base station of claim 10 , wherein the assistance information includes a target base station.
12. The base station of claim 10 , wherein the assistance information includes a service type of the wireless communication device.
13. The base station of claim 10 , wherein the processor is further configured to transmit the handover request including the assistance information comprising the preferred RRC state to the second base station when the wireless communication device is operated in the RRC inactive state of the first network.