SERVICE DISCOVERY METHOD AND DEVICE IN WIRELESS LAN SYSTEM

• US 20150334638A1
• Filed: 12/17/2013
• Published: 11/19/2015
• Est. Priority Date: 12/17/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: LEE, Byungjoo, CHO, Hangyu, KIM, Suhwook
• Granted Patent: US 9,807,677 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 67/1061 using node-based peer discovery mechanisms static access to replicated servers H04L67/1006; service discovery H04L67/51
• CPC Class Codes: H04L 67/51 Discovery or management thereof, e.g. service location protocol [SLP] or web services
• CPC Class Codes: H04W 48/14 using user query or user detection
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 8/186 Processing of subscriber group data
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

The present invention relates to a wireless communication system, and more particularly, to a service discovery method and device in a wireless LAN system. A service discovery method in a wireless LAN system according to one embodiment of the present invention can comprise: transmitting, by a request device, a service discovery request frame to a response device; and receiving, by the request device, a service discovery response frame, which comprises service information of the response device and service information of each of one or more other devices, from the response device. The one or more other devices can comprise a device which does not belong to the same group as the response device.

Claims

1. A method of performing a service discovery process in a wireless LAN system, comprising:

transmitting a service discovery request frame, which is transmitted by a requesting device, to a responding device; and

receiving, via the requesting device, a service discovery response frame comprising service information of the responding device and service information of each of one or more different devices from the responding device,

wherein the one or more different devices comprise a device not belongs to a group to which the responding device belongs thereto.

2. The method of claim 1, wherein the responding device corresponds to a device selected via a device discovery process performed by the requesting device.

3. The method of claim 1, wherein the responding device corresponds to a device having capability for caching the service information of each of the one or more different devices.

4. The method of claim 3, wherein information indicating the capability of the responding device is included in at least one of a beacon frame, a probe response frame, an associated frame and a re-associated frame transmitted by the responding device.

5. The method of claim 3, wherein information indicating the capability of the responding device is configured by a bitmap comprising a bit indicating whether the responding device supports a cached service discovery.

6. The method of claim 1, wherein the service discovery request frame comprises information, indicating whether a cached service discovery is requested, to indicate whether the service information is requested only for the responding device or whether the service information is requested for the responding device and the one or more different devices.

7. The method of claim 6, wherein the information, indicating whether the cached service discovery is requested, is indicated using a specific bit of a service protocol type field of the service discovery request frame.

8. The method of claim 1, wherein the service discovery response frame further comprises device identification information on each of the responding device and the one or more different devices.

9. The method of claim 1, wherein if a plurality of service types are supported by the responding device and the one or more different devices, the service discovery response frame comprises device identification information and service information of which is capable of being supported each service type.

10. The method of claim 1, wherein the service discovery process is performed before the requesting device is connected to a network.

11. The method of claim 1, wherein the group corresponds to a Wi-Fi direct group.

12. A method of performing a service discovery process in a wireless LAN system, comprising:

receiving a service discovery request frame, which is received by a responding device, from a requesting device; and

transmitting, via the responding device, a service discovery response frame comprising service information of the responding device and service information of each of one or more different devices to the requesting device,

wherein the one or more different devices comprise a device not belongs to a group to which the responding device belongs thereto.

13. A requesting device performing a service discovery process in a wireless LAN system, comprising:

a transceiver; and

a processor, the processor configured to transmit a service discovery request frame to a responding device using the transceiver, the processor configured to receive a service discovery response frame comprising service information of the responding device and service information of each of one or more different devices from the responding device using the transceiver,

wherein the one or more different devices comprise a device not belongs to a group to which the responding device belongs thereto.

14. A responding device performing a service discovery process in a wireless LAN system, comprising:

a transceiver; and

a processor, the processor configured to receive a service discovery request frame from a requesting device using the transceiver, the processor configured to transmit a service discovery response frame comprising service information of the responding device and service information of each of one or more different devices to the requesting device using the transceiver,

wherein the one or more different devices comprise a device not belongs to a group to which the responding device belongs thereto.