System and method for link adaptation for WLAN voice transmission

• US 20070153745A1
• Filed: 08/29/2006
• Published: 07/05/2007
• Est. Priority Date: 01/04/2006
• Status: Abandoned Application

• Current Assignee: Siemens Corporate Research Incorporated (Siemens AG)
• Original Assignee: Siemens Corporate Research Incorporated (Siemens AG)
• Inventors: Rosca, Justinian, Chindapol, Aik, Sun, Yishen
• Application Number:
  US11/511,555
• Publication Number:
  US 20070153745A1
• Time in Patent Office: Days
• US Class Current: 370/335
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0021 in which the algorithm uses adaptive thresholds
• CPC Class Codes: H04L 1/0032 Without explicit signalling
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end

Abstract

Methods and apparatus for Link Adaptation in IEEE 802.11 Wireless Local Area Network (WLAN) are disclosed. Methods and apparatus for optimizing voice traffic in real-time over WLAN are also disclosed. The methods are based on state transitions and depend on transmission parameters. A Transmission Diagram and a Rate Sequence providing an optimal Link Adaptation are also disclosed.

Claims

1. A method of link adaptation processing with a processor, comprising:

inputting a retry count to the processor;

inputting one or more inputs to the processor; and

determining a request rate as a function of the retry count and the one or more inputs.

2. The method of claim 1, wherein the one or more inputs includes an actual rate, a rate sequence and a transmission status.

3. The method of claim 2, comprising:

inputting the request rate, a rate sequence and a retry limit to the processor; and

determining a retry rate as a function of the request rate, the rate sequence and the retry limit to the processor.

4. The method of claim 2, comprising:

inputting BER information and SNR information to the processor; and

determining a rate sequence as a function of the BER information and the SNR information.

5. The method of claim 4, wherein the rate sequence specifies a sequence that skips one or more available rates.

6. The method of claim 2, comprising:

inputting PER information, SNR information and QoS requirements to the processor; and

determining an initial retry rate as a function of the BER information, the SNR information and the QoS requirements.

7. The method of claim 4, comprising:

inputting the request rate, the rate sequence and a retry limit to the processor; and

determining a retry rate as a function of the request rate, the rate sequence and the retry limit to the processor.

8. The method of claim 7, comprising:

inputting PER information and QoS requirements to the processor; and

determining an initial retry rate as a function of the BER information, the SNR information and the QoS requirements.

9. The method of claim 8, wherein the determining steps are performed simultaneously.

10. A method of link adaptation processing with a processor, comprising:

inputting a request rate, a rate sequence and a retry limit to the processor; and

determining a retry rate as a function of the request rate, the rate sequence and the retry limit to the processor.

11. The method of claim 10, wherein the rate sequence specifies a sequence that skips one or more available rates.

12. The method of claim 10, wherein a last retry rate is a function of the retry limit.

13. The method of claim 10, comprising:

inputting a retry count to the processor;

inputting one or more inputs to the processor; and

determining a request rate as a function of the retry count and the one or more inputs.

14. The method of claim 10, comprising:

inputting BER information and SNR information to the processor; and

determining a rate sequence as a function of the BER information and the SNR information.

15. The method of claim 14, wherein the rate sequence specifies a sequence that skips one or more available rates.

16. The method of claim 10, comprising:

inputting PER information, SNR information and QoS requirements to the processor; and

determining an initial retry rate as a function of the BER information, the SNR information and the QoS requirements.

17. The method of claim 16, comprising:

inputting PER information, SNR information and QoS requirements to the processor; and

determining an initial retry rate as a function of the BER information, the SNR information and the QoS requirements.

18. The method of claim 17, wherein the determining steps are performed simultaneously.

19. A method of link adaptation processing with a processor, comprising:

inputting BER information and SNR information to the processor; and

determining a rate sequence as a function of the BER information and the SNR information;

wherein the rate sequence specifies a sequence that skips one or more available rates.