System and method for link adaptation for WLAN voice transmission

Information

  • Patent Application
  • 20070153745
  • Publication Number
    20070153745
  • Date Filed
    August 29, 2006
    18 years ago
  • Date Published
    July 05, 2007
    17 years ago
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.
Description

DESCRIPTION OF THE DRAWINGS


FIG. 1 shows a system structure for WLAN Link Adaptation in accordance with one aspect of the present invention.



FIG. 2 provides BER vs. SNR curves for different transmission rates in accordance with another aspect of the present invention.



FIG. 3 provides PER vs. SNR curves for different transmission rates in accordance with a further aspect of the present invention.



FIGS. 4 and 5 show transition diagrams for Link Adaptation in accordance with another aspect of the present invention.



FIG. 6 shows two examples of transmission rates vs. channel conditions using Link Adaptation in accordance with a further aspect of the present invention.



FIG. 7 illustrates a system in accordance with yet a further aspect of the present invention.



FIG. 8 illustrates a functional block diagram of the link adaption processor.


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; anddetermining 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; anddetermining 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; anddetermining 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; anddetermining 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; anddetermining 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; anddetermining 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; anddetermining 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; anddetermining 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; anddetermining 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; anddetermining 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; anddetermining 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; anddetermining 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.
Provisional Applications (1)
Number Date Country
60756010 Jan 2006 US