Method for moving in wireless communication system and apparatus supporting same

1. A load-based mobility method performed by a terminal in a wireless communication system, the method comprising:

obtaining a load level of a serving network and a load level of a neighboring network;

receiving scaling factor information from the serving network,

wherein the scaling factor information includes a serving scaling factor associated with the serving network and a neighboring scaling factor associated with the neighboring network;

scaling a mobility parameter by applying the serving scaling factor according to the load level of the serving network and applying the neighboring scaling factor according to the load level of the neighboring network; and

performing a mobility evaluation of the serving network and the neighboring network based on the scaled mobility parameter.

2. The method of claim 1 , wherein the scaling of the mobility parameter includes applying the serving scaling factor or the neighboring scaling factor according to the load level to an offset value for the mobility evaluation.

3. The method of claim 1 , wherein the scaling of the mobility parameter includes applying the serving scaling factor or the neighboring scaling factor according to the load level for a duration time required to satisfy a criterion according to the mobility evaluation.

4. The method of claim 1 , wherein:

the obtaining of the load level of the serving network includes

obtaining system information from the serving network,

wherein the system information includes load information indicating the load level of the serving network.

5. The method of claim 1 , wherein:

the obtaining of the load level of the neighboring network includes:

receiving a beacon frame from the neighboring network,

wherein the beacon frame includes a load information element indicating the load level of the neighboring network.

6. The method of claim 1 , wherein:

the obtaining of the load level of the neighboring network includes

broadcasting a probe request frame, and

receiving a probe response frame from the neighboring network as a response to the probe request frame,

wherein the probe response frame includes a load information element indicating the load level of the neighboring network.

7. The method of claim 1 , wherein the terminal moves to the neighboring network when the mobility evaluation is satisfied.

8. The method of claim 7 , wherein when each of the serving network and the neighboring network is a third generation partnership project (3GPP) based access network, the terminal moves to the neighboring network by performing a handover or a cell reselection.

9. The method of claim 7 , wherein when the serving network is a third generation partnership project (3GPP) based access network and the neighboring network is a wireless local area network (WLAN) based access network, the terminal moves to the neighboring network by performing authentication and association procedures with the neighboring network.

10. The method of claim 9 , further comprising:

routing and processing at least a portion of traffic on the serving network to the neighboring network.

11. A wireless apparatus that operates in a wireless communication system, the wireless apparatus comprising:

a radio frequency (RF) unit configured to transmit or receive a radio signal; and

a processor operably coupled with the RF unit,

wherein the processor is configured to:

obtain a load level of a serving network and a load level of a neighboring network;

receive, via the RF unit, scaling factor information from the serving network,

wherein the scaling factor information includes a serving scaling factor associated with the serving network and a neighboring scaling factor associated with the neighboring network;

scale a mobility parameter by applying the serving scaling factor according to the load level of the serving network and applying the neighboring scaling factor according to the load level of the neighboring network; and

perform a mobility evaluation of the serving network and the neighboring network based on the scaled mobility parameter.