TRAINED DATA TRANSMISSION FOR COMMUNICATION SYSTEMS

• US 20080198760A1
• Filed: 04/24/2008
• Published: 08/21/2008
• Est. Priority Date: 11/20/2003
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel Corporation
• Inventors: Jacobsen, Eric A., Stephens, Adrian P., Sandhu, Sumeet, Kitchin, Duncan M.
• Granted Patent: US 7,826,798 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02

Abstract

Various embodiments are described for a trained data transmission for communication systems.

Claims

1. A method of transmitting information between first and second wireless stations, the method comprising:

performing a training phase including an exchange of medium reservation messages between the first and second stations to reserve a medium and to select at least one data transmission parameter, at least one of the medium reservation messages including a duration field indicating a duration of the medium reservation;

performing a first data phase including sending data from the first station to the second station according to the transmission parameter selected during the training phase;

performing a second data phase without first repeating the training phase, the second data phase comprising;

transmitting a protection portion from a first station to the second station, the protection portion including a duration field indicating a duration of a reserved medium; and

transmitting data from the first station to a second station according to the at least one transmission parameter.

2. The method of claim 1, the exchange of medium reservation messages in the training phase comprising:

receiving a medium reservation request message at the second station to initiate training and to request a medium reservation, said medium reservation request message includes training information comprising a training sequence; and

sending a medium reservation reply message from the second station granting a medium reservation request and providing training feedback describing at least one measured transmission condition.

3. The method of claim 2, the at least one measured transmission condition measured on a per antenna basis using each antenna where multiple antenna are used at the second station.

4. The method of claim 2 wherein the feedback describing at least one measured transmission condition comprises at least one from the group comprising:

a measured signal to noise ratio;

a presence of errors or not in received training information or other information;

a number of errors detected;

a bit error rate or packet error rate;

or

a measured signal strength.

5. The method of claim 4 wherein the measured transmission condition is measured on a per subcarrier basis.

6. The method of claim 1 wherein the selecting at least one data transmission parameter comprises selecting a data transmission parameter from the group including:

a data rate;

a modulation scheme;

a coding rate;

use or type of interleaving; and

transmission power.

7. The method of claim 6 wherein the selected data transmission parameter is selected on a per subcarrier basis.

8. A method comprising:

selecting at least one data transmission parameter;

transmitting a protection portion from a first station to a second station, the protection portion including a duration field indicating a duration of a reserved medium; and

transmitting data from the first station to the second station according to the at least one selected transmission parameter.

9. The method of claim 8, the at least one data transmission parameter selected according to an exchange of messages in a training phase, the exchange of messages comprising:

receiving a medium reservation request message at the second station to initiate training and to request a medium reservation, said medium reservation request message includes training information comprising a training sequence; and

sending a medium reservation reply message from the second station granting a medium reservation request and providing training feedback describing at least one measured transmission condition.

10. The method of claim 9, the at least one measured transmission condition measured on a per antenna basis using each antenna where multiple antenna are used at the second station.

11. The method of claim 9 wherein the feedback describing at least one measured transmission condition comprises at least one from the group comprising:

a measured signal to noise ratio;

a presence of errors or not in received training information or other information;

a number of errors detected;

a bit error rate or packet error rate;

or

a measured signal strength.

12. The method of claim 11 wherein the measured transmission condition is measured on a per subcarrier basis.

13. The method of claim 8 wherein the selecting at least one data transmission parameter comprises selecting a data transmission parameter from the group including:

a data rate;

a modulation scheme;

a coding rate;

use or type of interleaving; and

transmission power.

14. The method of claim 13 wherein the selected data transmission parameter is selected on a per subcarrier basis.

15. The method of claim 8, further comprising obtaining access to a wireless transmission medium prior to transmitting a medium reservation request message.