Method and system for WiBro network interworking in wireless terminal

1. A method for wireless broadband (WiBro) network interworking to a wireless local area network (WLAN) terminal by a relay station configured to connect the WLAN terminal to a WiBro network, the method comprising:

setting up a connection through an initial process with the WiBro network;

receiving an allocated Internet Protocol (IP) address to the WLAN terminal;

receiving an allocated unique Connection IDentification (CID) corresponding to a Quality of Service (QoS) level of the WLAN terminal, the allocated unique CID allocated after allocation of an IP address to the WLAN terminal;

mapping the allocated unique CID to the WLAN terminal to facilitate provisioning of Internet service to the WLAN terminal via a unique virtual link identified by the unique CID; and

transmitting a notification of the allocated IP address to the WLAN terminal,

wherein mapping the allocated unique CID to the WLAN terminal to facilitate provisioning of Internet service to the WLAN terminal via a unique virtual link identified by the unique CID comprises:

creating a new port identifier by port mapping between a source port of an application flow forwarded from the WLAN terminal and a source port of the unique virtual link identified by the unique CID;

creating a mapping table comprising port mapping information between the newly created port identifier and the source port of the unique virtual link identified by the unique CID; and

determining a destination port of the application flow forwarded from the WLAN terminal by port mapping between a destination port of a second packet received from a web server and the source port of the unique virtual link identified by the unique CID mapped to the destination port of the application flow.

2. The method of claim 1 , wherein the IP address comprises an IP version 6 (IPv6) or public IP version 4 (IPv4) address allocated in accordance with a dynamic host configuration protocol (DHCP).

3. The method of claim 1 , wherein the unique CID is identified by a source IP, a destination IP, a source port, a destination port, and a security key.

4. The method of claim 1 , wherein mapping the allocated unique CID to the WLAN terminal to facilitate provisioning of Internet service to the WLAN terminal via a unique virtual link identified by the unique CID further comprises:

translating the source port of the application flow into the newly created port identifier, and transmitting a first packet comprising the translated port to the web server comprising a destination port, the first packet being associated with the application flow; and

translating the destination port of the second packet received from the web server into the determined destination port and transmitting the second packet comprising the translated port to an application process of the WLAN terminal.

5. The method of claim 1 , wherein creating a new port identifier by port mapping between a source port of an application flow forwarded from the WLAN terminal and a source port of the unique virtual link identified by the unique CID comprises performing port mapping through an exclusive OR operation of the source port of the application flow and the source port of the unique virtual link identified by the unique CID.

6. The method of claim 1 , wherein determining a destination port of the application flow forwarded from the WLAN terminal by port mapping between a destination port of a second packet received from the web server and the source port of the unique virtual link identify by the unique CID mapped to the destination port of the second packet comprises performing port mapping through an exclusive OR operation of the destination port of the second packet received from the web server and the source port of the unique virtual link identified by the unique CID mapped to the destination port of the application flow.

7. A relay station for wireless broadband (WiBro) network interworking to a wireless local area network (WLAN) terminal, wherein the relay station is configured to:

set up a connection through an initial process with the WiBro network;

receive an allocated Internet Protocol (IP) address to the WLAN terminal;

receive an allocated unique Connection IDentification (CID) corresponding to a Quality of Service (QoS) level of the WLAN terminal, the allocated unique CID allocated after allocation of an IP address to the WLAN terminal;

map the allocated unique CID to the WLAN terminal to facilitate provisioning of Internet service to the WLAN terminal via a unique virtual link identified by the unique CID; and

transmit a notification of the allocated IP address to the WLAN terminal,

wherein mapping the allocated unique CID to the WLAN terminal to facilitate provisioning of Internet service to the WLAN terminal via a unique virtual link identified by the unique CID comprises:

creating a new port identifier by port mapping between a source port of an application flow forwarded from the WLAN terminal and a source port of the unique virtual link identified by the unique CID;

creating a mapping table comprising port mapping information between the newly created port identifier and the source port of the unique virtual link identified by the unique CID; and

determining a destination port of the application flow forwarded from the WLAN terminal by port mapping between a destination port of a second packet received from a web server and the source port of the unique virtual link identified by the unique CID mapped to the destination port of the application flow.

8. The relay station of claim 7 , the relay station comprising:

a WiBro connection manager to perform a WiBro initial process with a WiBro radio access station;

a WLAN host access point (AP) to authorize association with the WLAN terminal in response to reception of a request for WiBro network connection from the WLAN terminal;

a WiBro interworking setup manager to set up, in response to successful user authentication by the WLAN host AP, the WiBro network connection according to an Internet Protocol (IP) network formed between the WLAN terminal and the relay station; and

a mapper to map, in response to successful set up of the WiBro network connection by the WiBro interworking setup manager, the unique CID allocated by the WiBro radio access station to the node ID of the WLAN terminal.

9. The relay station of claim 8 , wherein:

the IP network formed between the WLAN terminal and the relay station is an IP version 4 (IPv4) network using a private address as the second IP address; and

the WiBro interworking setup manager is configured to:

create a new port identifier by port mapping between a source port of an application flow forwarded from the WLAN terminal and a source port of the unique virtual link identified by the unique CID; and

transmit and receive packets via utilization of a mapping table comprising port mapping information between the newly created port identifier and the source port of the unique virtual link identified by the unique CID.

10. The relay station of claim 7 , wherein the relay station is further configured to:

translate the source port of the application flow into the newly created port identifier and transmit a first packet comprising the translated port to the web server comprising a destination port, the first packet being associated with the application flow; and

translate the destination port of the second packet received from the web server into the determined destination port and transmit the second packet comprising the translated port to an application process of the WLAN terminal.

11. The relay station of claim 7 , wherein the IP address comprises an IP version 6 (IPv6) or public IP version 4 (IPv4) address allocated in accordance with a dynamic host configuration protocol (DHCP).

12. The relay station of claim 7 , wherein the unique CID is identified by a source IP, a destination IP, a source port, a destination port, and a security key.