Method and apparatus for controlling traffic in wireless communication system

1. A method for transmitting congestion information by a radio access network (RAN) node in a wireless communication system, the method comprising:

detecting congestion based on monitoring of the RAN node; and

transmitting the congestion information related to the detected congestion to a traffic control node,

wherein the congestion information is used to control the congestion for a user equipment (UE) being served by the RAN node, and is included in an extension header of an uplink general packet radio service (GPRS) tunneling protocol-user plane (GTP-U) packet transmitted in a user plane, and

wherein a cell identifier (ID) is included in the extension header of the uplink GTP-U packet, when a congestion status of the RAN node or a location of the UE changes.

2. The method of claim 1 , wherein the congestion information includes at least one of an identifier (ID) of the RAN node, a congestion indication indicating whether the congestion is detected, a congestion level indicating a degree of the congestion, a load reduction factor indicating an amount of load that needs to be reduced for congestion control, and information about UEs in an active state, which are accessing the RAN node.

3. The method of claim 1 , wherein the congestion information is included in all uplink GTP-U packets.

4. A radio access network (RAN) node in a wireless communication system, the RAN node comprising:

a processor configured to detect congestion based on monitoring of the RAN node; and

a transmitter configured to transmit congestion information including information related to the detected congestion to a traffic control node,

wherein the congestion information is used to control the congestion for a user equipment (UE) being served by the RAN node, and is included in an extension header of an uplink general packet radio service (GPRS) tunneling protocol-user plane (GTP-U) packet transmitted in a user plane, and

wherein a cell identifier (ID) is included in the extension header of the uplink GTP-U packet, when a congestion status of the RAN node or a location of the UE changes.

5. The RAN node of claim 4 , wherein the congestion information includes at least one of an identifier (ID) of the RAN node, a congestion indication indicating whether the congestion is detected, a congestion level indicating a degree of the congestion, a load reduction factor indicating an amount of load that needs to be reduced for congestion control, and information about UEs in an active state, which are accessing the RAN node.

6. The RAN node of claim 4 , wherein the congestion information is included in all uplink GTP-U packets.

7. A method for receiving congestion information by a traffic control node in a wireless communication system, the method comprising:

receiving the congestion information of a radio access network (RAN) node, the congestion information being related to congestion detected based on monitoring of the RAN node,

wherein the congestion information is used to control the congestion for a user equipment (UE) being served by the RAN node, and is included in an extension header of an uplink general packet radio service (GPRS) tunneling protocol-user plane (GTP-U) packet transmitted in a user plane, and

wherein a cell identifier (ID) is included in the extension header of the uplink GTP-U packet, when a congestion status of the RAN node or a location of the UE changes.

8. The method of claim 7 , wherein the congestion information includes at least one of an identifier (ID), a congestion indication indicating whether the congestion is detected, a congestion level indicating a degree of the congestion, a load reduction factor indicating an amount of load that needs to be reduced for congestion control, and information about UEs in an active state, which are accessing the RAN node.

9. The method of claim 7 , wherein the congestion information is included in all uplink GTP-U packets.

10. The method of claim 7 , in response to an operating mode of the UE is determined as a connection mode based on state information included in the extension header of the uplink GTP-U packet of the UE, further comprising:

starting a timer;

determining whether an uplink packet is received before the timer expires; and

identifying that the operating mode of the UE is switched from the connection mode to an idle mode based on a result of the determination.

11. The method of claim 10 , wherein the state information of the UE includes at least one of information indicating whether the UE is connected to the RAN node that the congestion is detected, information indicating whether the operating mode of the UE is any one of the connection mode and the idle mode, and information about a timer value used to start the timer.

12. The method of claim 10 , wherein the state information of the UE includes a mode indicator indicating whether the operating mode of the UE is one of the connection mode and the idle mode is, and is included in a modify bearer request message.

13. The method of claim 10 , wherein the state information of the UE is received if the operating mode of the UE is changed, or received according to a request of the traffic control node.

14. A traffic control node in a wireless communication system, the traffic control node comprising:

a receiver configured to receive, from a radio access network (RAN) node, congestion information being related to congestion detected based on monitoring of the RAN node,

wherein the congestion information is used to control the congestion for a user equipment (UE) being served by the RAN node, and is included in an extension header of an uplink general packet radio service (GPRS) tunneling protocol-user plane (GTP-U) packet transmitted in a user plane, and

wherein a cell identifier (ID) is included in the extension header of the uplink GTP-U packet, when a congestion status of the RAN node or a location of the UE changes.

15. The traffic control node of claim 14 , wherein the congestion information includes at least one of an identifier (ID), a congestion indication indicating whether the congestion is detected, a congestion level indicating a degree of the congestion, a load reduction factor indicating an amount of load that needs to be reduced for congestion control, and information about UEs in an active state, which are accessing the RAN node.

16. The traffic control node of claim 14 , wherein the congestion information is included in all uplink GTP-U packets.

17. The traffic control node of claim 14 , in response to an operating mode of the UE is determined as a connection mode based on state information included in the extension header of the uplink GTP-U packet of the UE, further comprising:

a controller configured to:

start a timer;

determine whether an uplink packet is received before the timer expires; and

identify that the operating mode of the UE is switched from the connection mode to an idle mode based on a result of the determination.

18. The traffic control node of claim 17 , wherein the state information of the UE includes at least one of information indicating whether the UE is connected to the RAN node that the congestion is detected, information indicating whether the operating mode of the UE is any one of the connection mode and the idle mode, and information about a timer value used to start the timer.

19. The traffic control node of claim 17 , wherein the state information of the UE includes a mode indicator indicating whether the operating mode of the UE is one of the connection mode and the idle mode is, and is included in a modify bearer request message.

20. The traffic control node of claim 17 , wherein the state information of the UE is received if the operating mode of the UE is changed, or received according to a request of the traffic control.