Lg Electronics Inc.

Eunkyo Kim

Minjung Kim

Jae Young Lee

Jinho Son

Jiyoung Huh

Chanphill Yun

Provided are an interworking procedure with an external network in a WLAN, a station supporting the interworking procedure, and a message format for the interworking procedure. In the interworking procedure, a non-AP station transmits a request message which includes an advertisement protocol ID set to a value indicating native query protocol and a native query information ID set to a value indicating emergency call number information. And the non-AP station receives from an access point (AP) a response message including zero or more emergency call numbers in response to the request message.

Interworking procedure with external network in wireless LAN and message format for the same

If a hand-held terminal is connected to a single AP, the AP is provided from an administration server information of all the APs controlled by the administration server, transmits the information to the hand-held terminal, updates and stores it, and uses the updated and stored information of the APs to execute handoff. Basic lines and forwarding lines are disposed between all the APs and a private branch exchange, and a communication channel is formed using the basic lines to allow transferring the communication channel to the forwarding lines, thereby enabling to continuously perform a telephone communication session even if there is handoff during the telephone communication session using the hand-held terminal.

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Seoul, South Korea

Eunkyo Kim