Method and apparatus for changing connection state of terminal

1. A method of changing a connection state of a user equipment, the method comprising:

receiving a radio resource control (RRC) message from a base station, where the RRC message includes instruction information for instructing state transition into a light connection state;

configuring a connection state of the user equipment into the light connection state based on the instruction information;

receiving a paging message for the user equipment; and

determining to change the connection state of the user equipment based on a UE identifier included in the paging message,

wherein the configuring into the light connection state includes suspending signaling radio bearer (SRB) and data radio bearer (DRB) of the user equipment and storing a UE context for maintaining a core network connection between the base station and a core network for the user equipment.

2. The method according to claim 1 , wherein when the UE identifier included in the paging message matches a first UE identifier allocated by a higher layer of the user equipment, the determining to change the connection state includes determining to change the connection state into an RRC idle state.

3. The method according to claim 2 , wherein the first UE identifier is International Mobile Subscriber Identity (IMSI) or SAE-Temporary Mobile Subscriber Identity (S-TMSI).

4. The method according to claim 1 , wherein when the UE identifier included in the paging message matches a second UE identifier allocated by the base station, the determining to change the connection state includes determining to change the connection state into an RRC connected state.

5. The method according to claim 4 , wherein the second UE identifier includes BS identification information and information for identifying a UE context allocated by the base station.

6. A method of controlling by a base station a connection state of a user equipment, the method comprising:

transmitting an radio resource control (RRC) message to the user equipment, wherein the RRC message includes instruction information for instructing state transition into a light connection state;

changing a connection state of the user equipment into the light connection state; and

transmitting a paging message including a UE identifier to the user equipment and triggering the connection state of the user equipment to be changed,

wherein the changing into the light connection state includes suspending signaling radio bearer (SRB) and data radio bearer (DRB) of the user equipment, and storing a UE context for maintaining a core network connection between the base station and a core network for the user equipment.

7. The method according to claim 6 , wherein the UE identifier is one of a first UE identifier allocated by a higher layer of the user equipment and a second UE identifier allocated by the base station.

8. The method according to claim 7 , wherein when the paging message includes the first UE identifier, the connection state of the user equipment is transitioned into an RRC idle state, and when the paging message includes the second UE identifier, the connection state of the user equipment is transitioned into an RRC connected state.

9. The method according to claim 6 , further comprising receiving a paging information for transmitting the paging message from a core network control plane entity after the transmitting of the RRC message.

10. The method according to claim 9 , wherein the paging information is included in an initial context setup request message.

11. The method according to claim 9 , wherein the paging information includes at least one of paging DRX, a UE identification information index, and cell area information.

12. A user equipment changing a connection state, the user equipment comprising:

a receiver configured to receive an radio resource control (RRC) message from a base station, wherein the RRC message includes instruction information indicating state transition into a light connection state; and

a controller configured to transit a connection state of the user equipment into the light connection state based on the instruction information,

wherein the receiver is configured to receive a paging message for the user equipment, and

wherein the controller is configured to determine to change the connection state of the user equipment based on a UE identifier included in the paging message, and

wherein the controller is configured to suspend signaling radio bearer (SRB) and data radio bearer (DRB) of the user equipment, and store a UE context for maintaining a core network connection between the base station and a core network for the user equipment.

13. The user equipment according to claim 12 , wherein when the UE identifier included in the paging message matches a first UE identifier allocated by a higher layer of the user equipment, the controller is configured to determine to change the connection state into an RRC idle state.

14. The user equipment according to claim 13 , wherein the first UE identifier is one of International Mobile Subscriber Identity (IMSI) and SAE-Temporary Mobile Subscriber Identity (S-TMSI).

15. The user equipment according to claim 12 ,

wherein when the UE identifier included in the paging message matches a second UE identifier allocated by the base station, the controller is configured to determine to change the connection state into an RRC connected state.

16. The user equipment according to claim 15 , wherein the second UE includes B S identification information and information for identifying a UE context allocated by the base station.