Systems and Methods for AP Discovery with FILS Beacon

• US 20130177002A1
• Filed: 09/25/2012
• Published: 07/11/2013
• Est. Priority Date: 01/09/2012
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Inventors: Sun, Sheng, Li, Yunbo, Au, Kwok Shum, Aboul-Magd, Osama, Suh, Junghoon
• Granted Patent: US 9,008,062 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04W 48/12 using downlink control channel

Abstract

A method and apparatus are disclosed for supporting access point (AP) discovery by a handset/station (STA) using a fast initial link setup (FILS) discovery frame. An embodiment method includes transmitting a plurality of FILS discovery frames at faster time intervals than designated for transmitting standard AP beacons, wherein the FILS discovery frames have a smaller size than standard AP beacons. An embodiment apparatus includes a processor and a computer readable storage medium storing programming for execution by the processor, the programming including instructions to broadcast a standard AP beacon for advertising a basic service set (BSS) repeatedly at subsequent time intervals, and broadcast a FILS discovery frame for advertising the BSS repeatedly at faster subsequent time intervals than for the standard AP beacon, wherein the FILS discovery frame has a smaller size than the standard AP beacon.

Claims

1. A method for supporting access point (AP) discovery, the method comprising:

transmitting a plurality of fast initial link setup (FILS) discovery frames at faster time intervals than designated for transmitting standard AP beacons,

wherein the FILS discovery frames have a smaller size than standard AP beacons.

2. The method of claim 1, wherein the FILS discovery frames comprise association information for establishing successful association between an AP and a handset/station (STA).

3. The method of claim 2, wherein the FILS discovery frames comprise at least a service set identifier (SSID).

4. The method of claim 1 further comprising transmitting a plurality of standard AP beacons at slower time intervals than the FILS discovery beacons.

5. The method of claim 4, wherein the FILS discovery frames are not transmitted when transmission of the FILS discovery frames overlaps in time with transmission of the standard AP beacons.

6. The method of claim 1, wherein the standard AP beacons are in accordance with Institute of Electrical and Electronics Engineers (IEEE) 802.11 standards and have a transmission period of about 100 milliseconds.

7. The method of claim 1, wherein transmitting the FILS discovery frames comprises transmitting the FILS discovery frames at a randomized broadcast pattern according to a defined sequence of transmission phases and non-transmission phases.

8. The method of claim 7, wherein transmitting the FILS discovery frames at a randomized broadcast pattern comprises:

predefining a plurality of transmit modes each comprising a sequence of transmission and non-transmission phases, the transmission and non-transmission phases are arranged in an arbitrary order; and

selecting a different transmit mode from the predefined transmit modes at different times.

9. The method of claim 1, wherein the FILS discovery frames are transmitted by an AP, wherein at least some of the FILS discovery frames are transmitted during an interval of time at a transmission period of less than 100 milliseconds, and wherein the transmission period allows a handset/station (STA) to discover the AP, associate with the AP, and establish link setup with the AP within about 100 milliseconds in accordance with Task Group for IEEE 802.11ai (TGai) requirement for FILS.

10. The method of claim 1, wherein the FILS discovery frames advertise a basic service set (BSS).

11. An apparatus for supporting access point (AP) discovery, the apparatus comprising:

a processor; and

a computer readable storage medium storing programming for execution by the processor, the programming including instructions to;

transmit a plurality of fast initial link setup (FILS) discovery frames at faster time intervals than designated for standard AP beacons,

wherein the FILS discovery frames have a smaller size than standard AP beacons.

12. The apparatus of claim 11, wherein the FILS discovery frames comprise a service set identifier (SSID).

13. The apparatus of claim 12, wherein the FILS discovery frames further comprise a network identifier.

14. The apparatus of claim 12, wherein the FILS discovery frames further comprise any combination of robust secure network (RSN) indication, an optional basic service set (BSS) load, an optional one or more BSS identifiers (BSSIDs).

15. The apparatus of claim 12, wherein the FILS discovery frames further comprise any combination of one or more supported rates, a power constraint, a robust secure network (RSN) indication, basic service set (BSS) load, a BSS average access delay, and one or more BSS identifiers (BSSIDs).

16. The apparatus of claim 11, wherein the programming includes further instructions to:

transmit a plurality of standard AP beacons at a slower time intervals than the FILS discovery frames; and

stop transmitting the FILS discovery frames when transmission of the FILS discovery frames overlaps in time with transmission of the standard AP beacons.

17. The apparatus of claim 11, wherein the programming includes further instructions to transmit the FILS discovery frames at a randomized broadcast pattern according to a sequence of transmission and non-transmission phases, wherein the transmission and non-transmission phases are arranged in an arbitrary order.

18. A network component supporting access point (AP) discovery, the network component comprising:

a processor; and

a computer readable storage medium storing programming for execution by the processor, the programming including instructions to;

broadcast a standard AP beacon for advertising a basic service set (BSS) repeatedly at subsequent time intervals; and

broadcast a fast initial link setup (FILS) discovery frame for advertising the BSS repeatedly at faster subsequent time intervals than for the standard AP beacon,

wherein the FILS discovery frame has a smaller size than the standard AP beacon.

19. The network component of claim 18, wherein the FILS discovery frame comprises one or more data elements that are compressed, the one or more data elements include a service set identifier (SSID) that is truncated in size via hashing.

20. The network component of claim 18, wherein the FILS discovery frame comprises a bitmap that indicates one or more data elements, the one or more data elements include a service set identifier (SSID).

21. The network component of claim 18, wherein the FILS discovery frame is transmitted at a first randomized pattern in time, and wherein a second network component broadcasts a second FILS discovery frame repeatedly at subsequent time intervals similar to that for the FILS discovery frame and at a second randomized pattern in time to avoid collision between the FILS discovery frame and the second FILS discovery frame.

22. The network component of claim 18, wherein the FILS discovery frame is transmitted periodically at a first period and the standard AP beacon is transmitted periodically at a second period, and wherein the first period is shorter than the second period.