Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
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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Du Yonggang
Feng Lei
Jin Xiaohui
Liu Bo
Shao Xiaoling
Cho Un C
ST-Ericsson SA
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