The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 14, 2011
Filed:
Aug. 19, 2004
Lei Feng, Shanghai, CN;
Xiaoling Shao, Shanghai, CN;
Xiaohui Jin, Shanghai, CN;
Yonggang Du, Shanghai, CN;
BO Liu, Shanghai, CN;
Xiaolu Sun, Shanghai, CN;
Lei Feng, Shanghai, CN;
Xiaoling Shao, Shanghai, CN;
Xiaohui Jin, Shanghai, CN;
Yonggang Du, Shanghai, CN;
Bo Liu, Shanghai, CN;
Xiaolu Sun, Shanghai, CN;
ST-Ericsson SA, Geneva, CH;
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.