Method and system for handover between wireless local area...

Details Method and system for handover between wireless local area... Method and system for handover between wireless local area...

2011-06-14

2011-06-14

Cho, Un C (Department: 2617)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S436000, C455S432100, C455S552100, C455S553100, C370S331000

Reexamination Certificate

active

07962140

ABSTRACT:
A method to be performed by a user terminal with WWAN and WLAN interfaces, comprising steps of: communicating via the WWAN interface; inspecting whether its WLAN interface is available; entering into a WWAN-to WLAN state from a WWAN active state if its WLAN interface is available; said user terminal provides a public server with known network address with its presence information said WWAN-to-WLAN state; and acquiring the network address of another user terminal communicating with said user terminal from said server, sending a WLAN call request to said another user terminal by using said address; entering into WLAN active state after receiving the message for accepting the WLAN call request from said another user terminal.

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Prasad, R, et al., “WLANs and WPANs towards 4G wireless”, 2003, Artech House, US, p. 25-62.
Translation of Office Action dated Jun. 11, 2010 in connection with Japanese Patent Application No. 2006-526739.

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