In-band QoS signaling reference model for QoS-driven wireless LANs

• US 7,298,724 B2
• Filed: 08/13/2004
• Issued: 11/20/2007
• Est. Priority Date: 07/14/2000
• Status: Expired due to Fees

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Ho, Jin-Meng, Lin, Wei
• Primary Examiner(s): Kizou; Hassan
• Assistant Examiner(s): Moutaouakil; Mounir
• Application Number:
  US10/917,951
• Publication Number:
  US 20050041670A1
• Time in Patent Office: 1,194 Days
• Field of Search: 370/310, 370/315, 370/328, 370/338, 370/347, 370/349, 370/350, 370/395.2, 370/395.21, 370/395.4, 370/395.42, 370/401, 370/445, 370/463, 370/464, 370/465, 370/470, 709/227, 709/228, 455/561
• US Class Current: 370/338
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04W 72/543 based on requested quality, e.g. QoS
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A station, such as a point coordinator (PC) or a non-PC station, in a basic service set (BSS) in a wireless local area network (WLAN) is disclosed. The station includes a frame classification entity (FCE), a frame scheduling entity (FSE) and a QoS management entity (QME). The FCE is logically located in a logical link control (LLC) layer of the station and has a classification table containing at least one classifier entry. Each classifier entry contains a virtual stream identifier (VSID) and a frame classifier associated with a user session. The FCE receives a data frame associated with the user session, which can be one of a voice session, a video session, a data session and a multimedia session. The data frame contains in-band quality of service (QoS) signaling information for the user session. The FCE classifies the received data frame to a selected VSID contained in a classifier entry in the classification table based on a match between an in-band frame classification information contained in the received frame and the frame classifier contained in the classifier entry. The FSE is logically located in a medium access control (MAC) sublayer of the station and has a frame scheduling table containing at least one entry. Each entry in the frame scheduling table contains a VSID and a QoS parameter set associated with a user session identified by the VSID. The FSE is responsive to the classified data frame by scheduling a transmission opportunity (TO) for the classified data frame based on the at least one QoS parameter value associated with the VSID and characterizing the user session. The QME interfaces with the FCE and The FSE.

Claims

1. A network including a basic service set (BSS), the network comprising:

a) a point coordinator (PC) station constituting a portion of the BSS, the PC station including;

1) a frame classification entity (FCE) logically located in a logical link control (LLC) layer of the station and having a classification table containing at least one classifier entry, each classifier entry containing a virtual stream identifier (VSID) and a frame classifier associated with a user session, the FCE receiving a data frame associated with the user session, the data frame containing in-band quality of service (QoS) signaling information for the user session, the FCE classifying the received data frame to a selected VSID contained in a classifier entry in the classification table based on a match between an in-band frame classification information contained in the received frame and the frame classifier contained in the classifier entry;

2) a frame scheduling entity (FSE) logically located in a medium access control (MAC) sublayer of the station and having a frame scheduling table containing at least one entry, each entry containing a VSID and a QoS parameter set associated with a user session identified by the VSID, the FSE, responsive to the classified data frame, scheduling a transmission opportunity (TO) for the classified data frame based on the at least one QoS parameter value associated with the VSID and characterizing the user session; and

3) a QoS management entity (QME) that interfaces with the FCE and the FSE; and

b) a non-point coordinator (non-PC) station constituting a portion of the BSS, the non-PC station including;

1) an FCE; and

2) a QME.

2. The network of claim 1, wherein:

the non-PC station further includes an FSE.

3. The network of claim 1, wherein the network is a wireless network.

4. The network of claim 1, wherein the user session is one of:

a voice session,

a video session,

a data session, and

a multimedia session.

5. The network of claim 1, wherein, when the FCE cannot classify the received data frame:

the FCE passes the received data frame to the QME, and

the QME examines the data frame for obtaining a frame classifier and at least one QoS parameter value characterizing a new user session.

6. The network of claim 1, wherein:

the FCE includes a timer value for each classifier entry in the classification table; and

when the FCE successfully classifies the received frame to a selected VSID contained in a classifier entry of the classification table, the FCE sets the timer value corresponding to the classifier entry to a predetermined value, the timer value expiring when no data frame associated with a user session using the classifier entry is successfully classified by the FCE.

7. The network of claim 1, wherein:

at least one classifier entry in the classification table includes a time value representing a maximum allowable predetermined time interval between consecutively received data frames; and

when the maximum allowable predetermined time interval is exceeded between consecutively received data frame, the user session is terminated.

8. The network of claim 1, wherein the wireless network is a wireless local area network (WLAN).

9. The network of claim 5, wherein, when the FCE that cannot classify the received data frame is in the point coordinator (PC) station:

the QME in the PC station establishes a virtual down-stream (VDS) for transporting the traffic of the user session from the LLC sublayer entity of the PC station to at least one peer LLC sublayer entity in the BSS, and assigns a VSJD to the established VDS.

10. The network of claim 5, wherein, when the FCE that cannot classify the received data frame is in a non-PC station:

a) the QME in the non-PC station causes the non-PC station to send a management frame to the PC station, the management frame containing;

1) a special VSID,

2) a frame classifier, and

3) at least one QoS parameter value that is associated with the new user session; and

b) the QME in the non-PC station indicates that the management frame is for setting up the new user session.

11. A method using in-band quality of service (QoS) signaling for a user session within a basic service set (BSS) in a network, the method comprising:

a) in a point coordinator (PC) station in the BSS, performing steps of;

1) forming a classification table that is logically located in a logical link control (LLC) sublayer of a station in the BSS, the classification table containing at least one classifier entry, each classifier entry containing a virtual stream identifier (VSJD) and a frame classifier associated with a user session;

2) receiving a data frame associated with the user session, the data frame containing in-band quality of service (QoS) signaling information for the user session;

3) classifying the received data frame to a selected VS contained in a classifier entry in the classification table based on a match between an in-band QoS classification information contained in the received frame and the frame classifier contained in the classifier entry;

4) forming a frame scheduling table logically located in a medium access control (MAC) sublayer of the station, the frame scheduling table containing at least one entry, each entry containing a VSID and at least one corresponding QoS parameter value associated with a user session; and

5) scheduling a transmission opportunity (TO) for the classified data frame based on the at least one QoS parameter value associated the VSID and characterizing the user session; and

b) in a non-PC station in the BSS, performing;

the classification table forming step;

the data frame receiving step; and

the data frame classifying step.

12. The method of claim 11, further comprising, in the non-PC station in the BSS, performing:

the frame scheduling table forming step; and

the TO scheduling step.

13. The method of claim 11, wherein the network is a wireless network.

14. The network of claim 11, wherein the user session is one of:

a voice session,

a video session,

a data session, and

a multimedia session.

15. The method of claim 11, wherein when the received data frame cannot be classified, the method further comprises:

examining the data frame for obtaining a frame classifier and at least one QoS parameter value characterizing a new user session.

16. The method of claim 11, wherein:

each classifier entry in the classification table includes a timer value; and

the method further comprises setting the timer value corresponding to the classifier entry to a predetermined value when the received frame is successfully classified to a selected VSID contained in a classifier entry of the classification table; and

the timer value for the classifier entry expires when no data frame associated with a user session using the classifier entry is successfully classified.

17. The method of claim 11, wherein:

at least one classifier entry in the classification table includes a time value representing a maximum allowable predetermined time interval between consecutively received data frames; and

when the maximum allowable predetermined time interval is exceeded between consecutively received data frame, the method further comprises terminating the user session.

18. The network of claim 13, wherein the wireless network is a wireless local area network (WLAN).

19. The method of claim 15, wherein, when the method is performed in a station that is a point coordinator (PC) station, the method further comprises:

establishing a virtual down-stream (VDS) for transporting the traffic of the user session from the LLC sublayer entity of the PC station to at least one peer LLC sublayer entity in the BSS; and

assigning a VSID to the established VDS.

20. The method of claim 15, wherein, when the method is performed by a station that is a non-PC station, the method further comprises:

a) sending a management frame to the PC station of the BSS, the management frame containing;

1) a special VSID,

2) a frame classifier, and

3) at least one QoS parameter value that is associated with the new user session; and

b) indicating the management frame is for setting up the new user session.