RSVP/SBM based side-stream session setup, modification, and teardown for QoS-driven wireless LANs

• US 7,738,378 B1
• Filed: 04/28/2005
• Issued: 06/15/2010
• Est. Priority Date: 07/14/2000
• Status: Expired due to Fees

• Current Assignee: AT&T Intellectual Property II LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property II LP (AT&T, Inc.)
• Inventors: Ho, Jin-Meng, Lin, Wei
• Primary Examiner(s): Nguyen; Steven H
• Assistant Examiner(s): Louis; Vinncelas
• Application Number:
  US11/116,857
• Time in Patent Office: 1,874 Days
• Field of Search: 370/310.2, 370/338, 370/346, 370/348, 370/395.21, 370/352, 370/351, 370/354, 370/389, 370/401, 370/912, 370/236, 370/329, 370/347, 370/392, 709/226, 709/220, 709/227, 709/230, 709/238, 709/245, 709/249, 455/445, 375/346
• US Class Current: 370/235
• CPC Class Codes: H04L 67/04 specially adapted for terminals or networks with limited capabilities; specially adapted for terminal portability
• CPC Class Codes: H04L 67/14 Session management for real-time applications in data packet communications networks H04L65/1066
• CPC Class Codes: H04L 67/61 taking into account QoS or priority requirements
• CPC Class Codes: H04W 28/24 Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 74/00 Wireless channel access
• CPC Class Codes: H04W 76/36 for reassigning the resources associated with the released connections
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 80/00 Wireless network protocols or protocol adaptations to wireless operation
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method and a system are disclosed for setting up, modifying and tearing down a side-stream communication session in a basic service set (BSS) in a wireless network so that the communication session has a defined Quality of Service (QoS). Regarding setting up a side-stream communication session, a first Path message and a first Resv message (Path/Resv message) of a RSVP protocol is detected at a designated subnet bandwidth manager (DSBM) in a station having a point coordinator (PC). The first Resv message originates from a RSVP agent of a destination non-PC station in the BSS and requests resource reservation for setting up a side-stream session between a source non-PC station and at least one destination non-PC station in the same BSS. The DSBM extracts a QoS parameter set and a classifier from the first Path/Resv message for the session.

Claims

1. A method for setting up a side-stream communication session in a basic service set (BSS) in a wireless local area network, the communication session having a defined Quality of Service (QoS), the method comprising steps of:

detecting a first Path message and a first Resv message of a RSVP protocol at a designated subnet bandwidth manager (DSBM) in a station having a point coordinator (PC station), wherein the DSBM performs admission control, the first Resv message originating from a RSVP agent of at least one destination non-PC station in the wireless local area network'"'"'s BSS and requesting a resource reservation for setting up a side-stream session between a source non-PC station in the wireless local area network'"'"'s BSS and said at least one destination non-PC station in the same BSS of the wireless local area network;

extracting at the DSBM a QoS parameter set and a classifier from at least one of the first Path message or the first Rev message for the side-stream session;

determining at the PC station'"'"'s DSBM whether to admit the side-stream session to the wireless local area network based on the QoS parameter set defining the side-stream session and a channel status report on a medium access control (MAC) sublayer of the wireless local area network'"'"'s BSS;

when the side-stream session is admitted, setting up by a QoS management entity (QME) of the PC station in the wireless local area network'"'"'s BSS a virtual side-stream (VSS) between the source non-PC station in the wireless local area network'"'"'s BSS and the at least one destination non-PC station in the wireless local area network'"'"'s BSS for transporting side-stream session traffic;

wherein the DSBM is part of the QME in the PC station in the wireless local area network'"'"'s BSS;

assigning by the QME a virtual stream identifier (VSID) to the VSS; and

instructing by the QME a frame scheduling entity (FSE) to create an entry corresponding to the VSS in a frame scheduling table of the FSE, the FSE being logically located in the MAC sublayer of the PC station, the entry in the frame scheduling table including the VSID and the QoS parameter set associated with the side-stream session.

2. The method according to claim 1, further comprising a step of sending a management frame from the PC station to the source non-PC station, the management frame including information relating to a setup of the VSS defined by the VSID, the classifier, and the QoS parameter set.

3. The method according to claim 2, further comprising steps of:

receiving the management frame by the source non-PC station;

passing the information contained in the management frame to a QME of the non-PC station;

instructing by the QME a frame classification entity (FCE) to create an entry corresponding to the VSS in a frame classification table of the FCE, the FCE being logically located in a logical link control (LLC) sublayer of the non-PC station, the entry in the frame classification table including the VSID and the classifier associated with the side-stream session; and

instructing by the QME a frame scheduling entity (FSE) to create an entry corresponding to the VSS in a frame scheduling table of the FSE, the FSE being logically located in the MAC sublayer of the non-PC station, the entry in the frame scheduling table including the VSID and the QoS parameter set associated with the side-stream session.

4. The method according to claim 3, further comprising steps of:

sending a second management frame from the PC station to each destination non-PC station in the BSS, the second management frame including information relating to a setup of the VSS defined by the VSID.

5. The method according to claim 1, further comprising steps of:

detecting at least one of a second Path message or second Resv message at the DSBM, the second Path message or the second Resv message originating outside the DSBM and requesting that a side-stream session be terminated;

extracting at the DSBM the classifier from at least one of the second Path message or the second Resv message for the side-stream session;

finding at the QME of the PC station the VSID that is associated with the extracted classifier;

instructing by the QME of the PC station the FSE of the PC station to delete the entry corresponding to the VSS in the frame scheduling table; and

sending a third management frame from the PC station to the non-PC station sourcing the VSS defined by the VSID, the third management frame including information relating to a teardown of the VSS.

6. The method according to claim 5, further comprising steps of:

receiving the third management frame by the source non-PC station;

passing the information contained in the third management frame to the QME of the non-PC station;

instructing by the QME of the non-PC station the FCE of the non-PC station to delete the entry corresponding to the VSS in the frame classification table; and

instructing by the QME of the non-PC station the FSE of the non-PC station to delete the entry corresponding to the VSS in the frame scheduling table.

7. The method according to claim 5, further comprising a step of sending a fourth management frame from the PC station to each destination non-PC station in the BSS, the fourth management frame including information relating to a teardown of the VSS defined by the VSID.

8. The method according to claim 1, wherein before the step of detecting the first Resv message at the DSBM, the method comprises steps of:

receiving the first Path message for the side-stream session at the DSBM, the first Path message being sent from a subnet bandwidth manager (SBM) of the source non-PC station in the BSS, the SBM being part of the QME in the non-PC station;

propagating the first Path message for the side-stream session from the DSBM to an RSVP agent of each destination station, the RSVP agent being an SBM when the destination station is a non-PC station in the BSS; and

receiving the first Resv message for the side-stream session at the DSBM, the first Resv message being sent from an RSVP agent of a destination station, the RSVP agent being an SBM when the destination station is a non-PC station in the BSS;

wherein after the step of determining at the DSBM whether to admit the side-stream session to the network, the method further comprises a step of sending the first Resv message for the session from the DSBM to the SBM of the source non-PC station in the BSS.

9. A point coordinator (PC) station in a basic service set (BSS) in a wireless local area network, the PC station comprising:

a designated subnet bandwidth manager (DSBM) detecting a first Path message and a first Resv message of a RSVP protocol, wherein the DSBM performs admission control, the first Resv message originating from a RSVP agent of at least one destination non-PC station in the wireless local area network'"'"'s BSS and requesting resource reservation for setting up a side-stream session between a source non-PC station in the wireless local area network'"'"'s BSS and said at least one destination non-PC station in the same BSS of the wireless local area network, the PC station'"'"'s DSBM extracting a Quality of Service (QoS) parameter set and a classifier from at least one of the first Path message or the first Resv message for the side-stream session, and determining whether to admit the side-stream session to the wireless local area network based on the QoS parameter set defining the side-stream session and a channel status report on a medium access control (MAC) sublayer of the wireless local area network'"'"'s BSS;

a QoS management entity (QME) responsive to the admitted side-stream session by setting a virtual side-stream (VSS) for transporting the side-stream session traffic between the source non-PC station in the wireless local area network'"'"'s BSS and the at least one destination non-PC station in the wireless local area network'"'"'s BSS, the PC station'"'"'s DSBM being part of the QME in the PC station in the wireless local area network'"'"'s BSS; and

a frame scheduling entity (FSE) having a frame scheduling table, the FSE being logically located in a MAC sublayer of the PC station;

wherein the QME assigns a virtual stream identifier (VSID) to the VSS, and instructs the FSE to create an entry corresponding to the VSS in the frame scheduling table of the FSE, the entry in the frame scheduling table including the VSID and the QoS parameter set associated with the side-stream session.

10. The PC station according to claim 9, wherein the QME sends a management frame from the PC station to the source non-PC station, the management frame including information relating to a setup of the VSS defined by the VSID, the classifier, and the QoS parameter set.

11. The PC station according to claim 10, wherein the source non-PC station includes a local QME, a local FCE that is logically located in a logical link control (LLC) sub layer of the source non-PC station and a local FSE that is logically located in the MAC sublayer of the source non-PC station, the source non-PC station receiving the management frame and passing the information contained in the management frame to the local QME,

wherein the source non-PC station receives the management frame and passes the information contained in the management frame to the local QME,

wherein the local QME instructs the local FCE to create an entry corresponding to the VSS in the frame classification table of the FCE, the entry in the frame classification table including the VSID and the classifier associated with the side-stream session;

and

wherein the local QME instructs the local FSE to create an entry corresponding to the VSS in the frame scheduling table of the FSE, the entry in the frame scheduling table including the VSID and the QoS parameter set associated with the side-stream session.

12. The PC station according to claim 11, wherein the non-PC station sends a second management frame to each destination non-PC station in the BSS, the second management frame including information relating to a setup of the VSS defined by the VSID.

13. The PC station according to claim 9, wherein the DSBM detects at least one of a second Path message or a second Resv message, the second Path message or the second Resv message originating outside the DSBM and requesting that a side-stream session be terminated, the DSBM extracting the classifier from at least one of the second Path message or second Resv message for the session,

wherein the QME of the PC station finds the VSID that is associated with the extracted classifier, the QME of the PC station instructing the FSE of the PC station to delete the entry corresponding to the VSS in the frame scheduling table, and

wherein the PC station sends a third management frame to the non-PC station sourcing the VSS defined by the VSID, the third management frame including information relating to a teardown of the VSS.

14. The PC station according to claim 13, wherein the non-PC station sourcing the VSS includes a local QME, a local FCE that is logically located in the LLC sublayer of the source non-PC station and a local FSE that is logically located in the MAC sublayer of the source non-PC station, the source non-PC station receiving the third management frame and passing the information contained in the third management frame to the local QME,

wherein the non-PC station sourcing the VSS receives the third management frame and passes the information contained in the third management frame to the local QME of the non-PC station,

wherein the local QME of the non-PC station instructs the local FCE of the non-PC station to delete the entry corresponding to the VSS in the frame classification table, and

wherein the local QME of the non-PC station instructs the local FSE of the non-PC station to delete the entry corresponding to the VSS in the frame scheduling table.

15. The PC station according to claim 13, wherein the PC station sends a fourth management frame to each destination non-PC station in the BSS, the fourth management frame including information relating to a teardown of the VSS defined by the VSID.

16. The PC station according to claim 9, wherein before DSBM detects the first Resv message, the DSBM receives the first Path message for the side-stream session, the first Path message being sent from a subnet bandwidth manager (SBM) of the source non-PC station in the BSS, the SBM being part of the QME in the non-PC station;

wherein the DSBM propagates the first Path message for the side-stream session to an RSVP agent of each destination station, the RSVP agent being an SBM when the destination station is a non-PC station in the BSS,

wherein the DSBM receives the first Resv message for the side-stream session, the first Resv message being sent from an RSVP agent of a destination station, the RSVP agent being an SBM when the destination station is a non-PC station in the BSS, and

wherein after the DSBM determines whether to admit the side-stream session to the network, the DSBM sends the first Resv message for the session to the SBM of the source non-PC station in the BSS.