Multipoll for QoS-driven wireless LANs

• US 8,014,372 B2
• Filed: 12/08/2009
• Issued: 09/06/2011
• 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): SHEDRICK, CHARLES TERRELL
• Application Number:
  US12/633,742
• Publication Number:
  US 20100085933A1
• Time in Patent Office: 637 Days
• Field of Search: 370/338, 370/346, 370/3.51, 370/339, 370/329, 370/449
• US Class Current: 370/338
• CPC Class Codes: H04W 28/0268 using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] negotiating SLA or negotiating QoS H04W28/24
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 72/543 based on requested quality, e.g. QoS
• CPC Class Codes: H04W 74/06 using polling

Abstract

A method and a system are disclosed for providing quality of service (QoS)-driven channel access within a basic service set (BSS) in a wireless network. At least one available TO is allocated to a selected non-PC station having traffic to transmit. A multipoll frame containing information relating to at least two allocated TOs is then sent from the PC station containing information relating to each allocated TO.

Claims

1. A method for providing a quality of service driven channel access within a basic service set in a wireless network, comprising:

determining a transmission opportunity that is available during a contention free period of a superframe for transmitting traffic in the basic service set, where a time duration of the superframe comprises the contention free period and a contention period; and

sending from a point coordinator station of the basic service set, a multipoll frame allocating a plurality of transmission opportunities to respective non-point coordinator stations and identifying each transmission opportunity that is allocated by a respective duration time.

2. The method of claim 1, wherein the respective duration time for each transmission opportunity is a maximum length of time for each transmission opportunity.

3. The method of claim 1, wherein each successive transmission opportunity starts after a preceding transmission opportunity when the respective duration time associated with the preceding transmission opportunity expires.

4. The method of claim 1, wherein the multipoll frame comprises information relating to the plurality of transmission opportunities, wherein when a data frame that is indicated to be a final data frame is transmitted in a selected transmission opportunity, a transmission opportunity that is subsequent to the selected transmission opportunity begins a short interframe spacing period of time after a preceding station sends the final data frame.

5. The method of claim 4, wherein the transmission opportunity that is subsequent to the selected transmission opportunity ends when the respective duration time associated with the transmission opportunity that is subsequent to the selected transmission opportunity ends.

6. The method of claim 5, wherein when the transmission opportunity that is subsequent to the selected transmission opportunity is a last transmission opportunity identified in the multipoll frame, any remaining time is returned for reallocation by the point coordinator station.

7. The method of claim 1, further comprising:

receiving the multipoll frame at a non point coordinator station for which an available transmission opportunity was allocated, where the multipoll frame includes information relating to a virtual stream identifier; and

transmitting from the non point coordinator station a data frame during the transmission opportunity allocated to the non-point coordinator station, the data frame being associated with a virtual stream identifier, wherein the data frame is part of an up-stream traffic.

8. The method of claim 1, further comprising:

receiving the multipoll frame at a non-point coordinator station for which an available transmission opportunity was allocated, where the multipoll frame includes information relating to a virtual stream identifier; and

transmitting from the non-point coordinator station a data frame during the transmission opportunity allocated to the non-point coordinator station, the data frame being associated with the virtual stream identifier, wherein the data frame is part of a side-stream traffic.

9. The method of claim 1, further comprising:

receiving the multipoll frame at a non-point coordinator station for which an available transmission opportunity was allocated, wherein the multipoll frame includes information relating to a virtual stream identifier; and

transmitting from the non-point coordinator station a data frame during the transmission opportunity allocated to the non-point coordinator station, the data frame being associated with a selected virtual stream identifier that is different from the virtual stream identifier identified in the multipoll frame, and the data frame being transmitted based on a comparison of a quality of service parameter set associated with the selected virtual stream identifier and a quality of service parameter set associated with the virtual stream identifier identified in the multipoll frame.

10. The method of claim 1, further comprising:

receiving the multipoll frame at a non-point coordinator station for which an available transmission opportunity was allocated, wherein the multipoll frame includes information relating to an association identifier; and

transmitting from the non-point coordinator station a data frame during the transmission opportunity allocated to the non-point coordinator station, the data frame being transmitted based completely on a determination made by a frame scheduling entity of the non-point coordinator station.

11. A system comprising a point coordinator station in a basic service set in a wireless network, comprising:

the point coordinator station, comprising;

a frame scheduling entity for determining a transmission opportunity that is available during a contention free period of a superframe for transmitting traffic in the basic service set, where a time duration of the superframe comprises the contention free period and a contention period; and

a transmitter for sending a multipoll frame allocating a plurality of transmission opportunities to respective non-point coordinator stations and identifying each transmission opportunity that is allocated by a respective duration time.

12. The system of claim 11, wherein the respective duration time for each transmission opportunity is a maximum length of time for each transmission opportunity.

13. The system of claim 11, wherein each successive transmission opportunity starts after a preceding transmission opportunity when the respective duration time associated with the preceding transmission opportunity expires.

14. The system of claim 11, wherein the multipoll frame comprises information relating to a plurality of allocated transmission opportunities, wherein when a data frame that is indicated to be a final data frame is transmitted in a selected transmission opportunity, a transmission opportunity that is subsequent to the selected transmission opportunity begins a short interframe spacing period of time after a preceding station sends the final data frame.

15. The system of claim 14, wherein the transmission opportunity that is subsequent to the selected transmission opportunity ends when the respective duration time associated with the transmission opportunity that is subsequent to the selected transmission opportunity ends.

16. The system of claim 11, further comprising:

a non-point coordinator station for which an available transmission opportunity was allocated, receives the multipoll frame, and transmits a data frame during the transmission opportunity allocated to the non-point coordinator station, wherein the multipoll frame includes information relating to a virtual stream identifier, and wherein the data frame is part of an up-stream traffic.

17. The system of claim 11, further comprising:

a non-point coordinator station for which an available transmission opportunity was allocated, receives the multipoll frame, and transmits a data frame during the transmission opportunity allocated to the non-point coordinator station, wherein the multipoll frame includes information relating to a virtual stream identifier, and wherein the data frame is part of a side-stream traffic.

18. The system of claim 11, further comprising:

a non-point coordinator station in the basic service set receiving the multipoll frame, wherein the multipoll frame includes information relating to a virtual stream identifier, the non-point coordinator station being a non-point coordinator station for which an available transmission opportunity was allocated, the point coordinator station transmitting a data frame during the transmission opportunity allocated to the non-point coordinator station, the data frame being associated with a selected virtual stream identifier that is different from the virtual stream identifier identified in the multipoll frame, and the data frame being transmitted based on a comparison of a quality of service parameter set associated with the selected virtual stream identifier and a quality of service parameter set associated with the virtual stream identifier identified in the multipoll frame.

19. The system of claim 11, further comprising;

a non-point coordinator station in the basic service set receiving the multipoll frame, wherein the multipoll frame includes information relating to an association identifier, the non-point coordinator station being a non-point coordinator station for which an available transmission opportunity was allocated, and the non-point coordinator station transmitting from the non-point coordinator station a data frame during the transmission opportunity allocated to the non-point coordinator station, the data frame being transmitted based completely on a determination made by the frame scheduling entity of the non-point coordinator station.

20. The system of claim 11, wherein the wireless network comprises a wireless local area network.