STATE TRANSITION METHOD OF WIRELESS COMMUNICATION SYSYEM

• US 20180176834A1
• Filed: 12/21/2017
• Published: 06/21/2018
• Est. Priority Date: 12/21/2016
• Status: Active Grant

• Current Assignee: FG Innovation Company Limited
• Original Assignee: Chie-Ming Chou, Yung-Lan Tseng
• Inventors: WEI, CHIA-HUNG, CHOU, CHIE-MING, TSENG, YUNG-LAN
• Granted Patent: US 10,638,373 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 36/0016 Hand-off preparation specially adapted for end-to-end data sessions
• CPC Class Codes: H04W 36/0066 of control information between different types of networks in order to establish a new radio link in the target network
• CPC Class Codes: H04W 36/0072 of resource information of target access point
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

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.

Claims

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, wherein the network transition request includes an assistance information of the wireless communication device; and

transmitting, by the first base station, a handover request including the assistance information to a second base station of a second network;

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 an RRC inactive state of the first network to a first state of the second network in response to the state transition message.

2. The state transition method of claim 1, 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.

3. The state transition method of claim 1, wherein the assistance information includes a target base station.

4. The state transition method of claim 1, wherein the assistance information includes a service type of the wireless communication device.

5. The state transition method of claim 1, wherein the network transition request is an RRC connection resume message.

6. 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, wherein the network transition request includes an assistance information of the wireless communication device;

the first base station is further configured to transmit a handover request including the assistance information to the second base station;

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 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 an RRC inactive state of the first network to a first state of the second network in response to the state transition message.

7. The wireless communication system of claim 6, 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 system of claim 6, wherein the assistance information includes a target base station.

9. The wireless communication system of claim 6, wherein the assistance information includes a service type of the wireless communication device.

10. The wireless communication system of claim 6, wherein the network transition request is an RRC connection resume message.

11. A wireless communication device, comprising:

a processor configured to;

transmit a network transition request to a first base station of a first network, wherein the network transition request includes an assistance information of the wireless communication device;

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

transition from an RRC inactive state of a first network to a first state of a second network.

12. The wireless communication device of claim 11, 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.

13. The wireless communication device of claim 11, wherein the assistance information includes a target base station.

14. The wireless communication device of claim 11, wherein the assistance information includes a service type of the wireless communication device.

15. The wireless communication device of claim 11, wherein the network transition request is an RRC connection resume message.

16. 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, wherein the network transition request includes an assistance information of the wireless communication device;

transmit a handover request including the assistance information to a second base station of a second network;

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 an 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.

17. The base station of claim 16, 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.

18. The base station of claim 16, wherein the assistance information includes a target base station.

19. The base station of claim 16, wherein the assistance information includes a service type of the wireless communication device.

20. The base station of claim 16, wherein the network transition request is an RRC connection resume message.