Interworking procedure with external network in wireless LAN and message format for the same
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.
1. A method for interworking with an external network in a wireless local access network, the method comprising:
transmitting, by a requesting station, a generic advertisement service (GAS) initial request frame to a responding station, the GAS initial request frame including:
a category field set to a value indicating a public action frame;
an action field set to a value indicating the GAS initial request frame;
an advertisement protocol element indicating a query to the responding station to retrieve information from an advertisement server of the external network; and
a query request element indicating a query for emergency call number information; and
receiving, by the requesting station, a GAS initial response frame from the responding station, the GAS initial response frame including:
a category field set to a value indicating a public action frame;
an action field set to a value indicating the GAS initial response frame; and
a query response element including a list of emergency call numbers retrieved from the advertisement server.
2. The method according to claim 1 ,
wherein the query response element further includes an information ID field indicating the emergency call number information.
3. The method according to claim 1 ,
wherein the list of emergency call numbers are directed to a public safety answering point (PSAP).
4. A wireless device for interworking with an external network in a wireless local access network, the wireless device comprising:
a processor configured to generate and process frames; and
a transceiver operably connected to the processor and configured to transmit and receive the frames for the processor,
wherein the processor is further configured to:
transmit, via the transceiver, a generic advertisement service (GAS) initial request frame to a responding station, the GAS initial request frame including:
a category field set to a value indicating a public action frame;
an action field set to a value indicating the GAS initial request frame;
an advertisement protocol element indicating a query to the responding station to retrieve information from an advertisement server of the external network; and
a query request element indicating a query for emergency call number information; and
receive, via the transceiver, a GAS initial response frame from the responding station, the GAS initial response frame including:
a category field set to a value indicating a public action frame;
an action field set to a value indicating the GAS initial response frame; and
a query response element including a list of emergency call numbers retrieved from the advertisement server.
5. A wireless device for interworking with an external network in a wireless local access network, the wireless device comprising:
a processor configured to generate and process frames; and
a transceiver operably connected to the processor and configured to transmit and receive the frames for the processor,
wherein the processor is further configured to:
receive, via the transceiver, a generic advertisement service (GAS) initial request frame from a requesting station, the GAS initial request frame including:
a category field set to a value indicating a public action frame;
an action field set to a value indicating the GAS initial request frame;
an advertisement protocol element indicating a query to the wireless device to retrieve information from an advertisement server of the external network; and
a query request element indicating a query for emergency call number information;
retrieve, via the transceiver, a list of emergency call numbers from the advertisement server; and
transmit, via the transceiver, a GAS initial response frame to the requesting station, the GAS initial response frame including:
a category field set to a value indicating a public action frame;
an action field set to a value indicating the GAS initial response frame; and
a query response element including the list of emergency call numbers retrieved from the advertisement server.