FAST INITIAL LINK SETUP DISCOVERY FRAMES

• US 20140010223A1
• Filed: 07/02/2013
• Published: 01/09/2014
• Est. Priority Date: 07/03/2012
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Wang, Lei, Murias, Ronald G., Targali, Yousif, Zhang, Guodong, Olesen, Robert L.
• Granted Patent: US 9,232,548 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04W 36/0061 of neighbour cell information
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method for use in a wireless station includes receiving a fast initial link setup discovery (FD) frame from an access point (AP) between instances of a full beacon frame and determining whether to associate with the AP based on the received FD frame. The FD frame includes FD frame contents and a FD frame control field. The FD frame control field includes a service set identifier (SSID) length field, corresponding to a length of a variable length SSID field in the FD frame contents; and any one or more of: a capability presence indicator, an access network options presence indicator, a security presence indicator, an AP configuration change count presence indicator, or an AP next target beacon transmission time presence indicator. Each of the presence indicators is used to indicate whether a corresponding field is present in the FD frame contents.

Claims

1. A method for use in a wireless station, comprising:

receiving a fast initial link setup discovery (FD) frame from an access point (AP) between instances of a full beacon frame, wherein the FD frame includes;

FD frame contents; and

a FD frame control field, comprising;

a service set identifier (SSID) length field, corresponding to a length of a variable length SSID field in the FD frame contents; and

any one or more of;

a capability presence indicator, indicating whether a corresponding capability field is present in the FD frame contents;

an access network options presence indicator, indicating whether a corresponding access network options field is present in the FD frame contents;

a security presence indicator, indicating whether a corresponding security field is present in the FD frame contents;

an AP configuration change count presence indicator, indicating whether a corresponding AP configuration change count field is present in the FD frame contents;

or

an AP next target beacon transmission time presence indicator, indicating whether a corresponding AP next target beacon transmission time field is present in the FD frame contents; and

determining whether to associate with the AP based on the received FD frame.

2. The method according to claim 1, wherein the capability field includes capability information for the AP.

3. The method according to claim 1, wherein the access network options field indicates access services provided by the AP.

4. The method according to claim 1, wherein the security field indicates one or more types of security used by the AP.

5. The method according to claim 1, wherein the AP configuration change count field indicates a number of times that a set of AP configuration parameters has changed.

6. The method according to claim 1, wherein the AP next target beacon transmission time field indicates a transmission time of a next full beacon frame from the AP.

7. The method according to claim 6, wherein the AP next target beacon transmission time is expressed as an offset value relative to an FD frame transmission time.

8. The method according to claim 7, wherein the offset value is expressed as a number of time units.

9. The method according to claim 1, wherein the FD frame control field further comprises:

a neighbor AP information presence indicator, indicating whether a corresponding neighbor AP information field is present in the FD frame contents.

10. The method according to claim 9, wherein the neighbor AP information field includes an operating class field, a channel number field, and a next target beacon transmission time field for each neighbor AP in the neighbor AP information field.

11. The method according to claim 10, wherein each next target beacon transmission time field indicates a transmission time of a next full beacon frame from the corresponding neighbor AP.

12. The method according to claim 11, wherein the next target beacon transmission time is expressed as an offset value relative to an FD frame transmission time.

13. The method according to claim 12, wherein the offset value is expressed as a number of time units.

14. The method according to claim 1, wherein the FD frame contents further include optional fields or optional information elements.

15. The method according to claim 14, wherein on a condition that the FD frame contents include any optional fields, a presence indicator corresponding to the optional field is included in the FD frame control field.

16. The method according to claim 1, further comprising:

on a condition that the determination of whether to associate with the AP based on the received FD frame is positive, transmitting an association request frame to the AP.