Method of creating and deleting service flow for robust header compression, and wireless communication system supporting the same

1. A method of creating a service flow for ROHC (Robust Header Compression) comprising:

upon receiving a subscriber profile to which ROHC is applied at a control station, obtaining a first ROHC parameter at the control station from a ROHC entity of the control station;

transmitting a first message for reservation of a ROHC negotiation including the first ROHC parameter for requesting the creation of service flow at the control station to a base station;

upon receiving the first message from the control station at the base station, determining whether or not the service flow creation request is accepted by verifying radio resources;

performing a DSA (Dynamic Service Addition) procedure with a mobile station corresponding to the service flow through the use of a second message including the first ROHC parameter at the base station, wherein the DSA procedure is performed when it is determined that the service flow creation request is accepted;

determining whether or not the ROHC negotiation is completed by the DSA procedure at the control station; and

performing a DSC (Dynamic Service Change) procedure with the mobile station for completion of the ROHC negotiation at the base station, wherein the DSC procedure is performed when it is determined that the ROHC negotiation is not completed by the DSA procedure,

wherein the control station is separate from the base station and the mobile station, and

wherein the first ROHC parameter includes a ROHC context ID, the mapping relationship between the service flow and the ROHC context ID is 1:N, where N is a positive integer greater than one, and the mapping relationship between the ROHC context ID and an IP flow of ROHC packets received and transmitted by the service flow is 1:1.

2. The method according to claim 1 , further comprising receiving a response message including a second ROHC parameter for the ROHC negotiation with the mobile station at the control station from the base station.

3. The method according to claim 1 , wherein the first ROHC parameter further includes at least any one of per-channel parameter and a classifier related whether or not the ROHC should be applied.

4. The method according to claim 1 , wherein the first ROHC parameter is transmitted while being included in service flow information of the service flow for the ROHC.

5. The method according to claim 4 , wherein the service flow information includes the ROHC context ID, and classifier related whether or not the ROHC should be applied, as sub-TLV.

6. The method according to claim 1 , further comprising, upon receiving a response message of the second message including a second ROHC parameter for the ROHC negotiation from the mobile station at the base station, transmitting the response message of the first message including the second ROHC parameter at the base station to the control station.

7. The method according to claim 1 , further comprising, upon receiving the first message including a ROHC parameter for completion of the ROHC negotiation from the control station at the base station, performing the DSC procedure with the mobile station through the use of the second message including the ROHC parameter for completion of the ROHC negotiation at the base station.

8. The method according to claim 1 , further comprising, receiving the subscriber profile including dynamic service flow information having a ROHC policy with a policy and charging rules function (PCRF) during an establishing procedure of dynamic service flow at the control station, and determining whether or not the dynamic service flow should be applied by ROHC; and

initiating a procedure of the dynamic service flow with ROHC at the control station, and triggering a ROHC negotiation procedure with the mobile station related with the subscriber profile.

9. A wireless communication system comprising:

a control station configured to obtain a first robust header compression (ROHC) parameter from a ROHC entity when a subscriber profile to be applied by ROHC is obtained, and transmit a first message for reservation of a ROHC negotiation including the first ROHC parameter for requesting a creation of a service flow for the ROHC to a base station; and

a base station configured to perform a dynamic service addition (DSA) procedure with a mobile station related with the subscriber profile through the use of second message including the first ROHC parameter, wherein the DSA procedure is performed when it is determined that the creation of the service flow is accepted by verifying radio resources,

wherein the base station transmits a response message of the first message including a second ROHC parameter to the control station when a response message of the second message including the second ROHC parameter for a ROHC negotiation is received from the mobile station,

wherein the base station receives the first message including a ROHC parameter for completion of the ROHC negotiation from the control station and performs a dynamic service change (DSC) procedure with the mobile station through the use of a message including the ROHC parameter for completion of the ROHC negotiation, wherein the DSC procedure is performed when the control station determines that the ROHC negotiation is not completed by the DSA procedure,

wherein the control station is separate from the base station and the mobile station, and

wherein the first ROHC parameter includes a ROHC context ID, the mapping relationship between the service flow and the ROHC context ID is 1:N, where N is a positive integer greater than one, and the mapping relationship between the ROHC context ID and an IP flow of ROHC packets received and transmitted by the service flow is 1:1.

10. The wireless communication system according to claim 9 , wherein the first ROHC parameter further includes at least any one of per-channel parameter and a classifier related whether or not the ROHC should be applied.

11. The wireless communication system according to claim 9 , wherein the first ROHC parameter is transmitted while being included in service flow information of the service flow for the ROHC.

12. The wireless communication system according to claim 11 , wherein the service flow information includes the ROHC context ID, and classifier related whether or not the ROHC should be applied, as sub-TLV.