System and method for wireless multiple access

• US 20060221873A1
• Filed: 03/31/2005
• Published: 10/05/2006
• Est. Priority Date: 03/31/2005
• Status: Abandoned Application

• Current Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Sharony, Jacob
• Application Number:
  US11/095,820
• Publication Number:
  US 20060221873A1
• Time in Patent Office: Days
• US Class Current: 370/278
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

Described is a system which includes an access point and a plurality of wireless devices. The access point transmits a predetermined number of first signals using a first wireless communication mode (“FCM”). The predetermined number of the first signals corresponds to a number of transmitting antennas of the access point. The FCM provides a time slot for each of the first signals to be transmitted. Each of the wireless devices receives each of the first signals. Each wireless device utilizes the first signals to generate a first communication matrix. Each of the wireless devices transmits a second signal to the access point. The access point generates a second communication matrix as a function of the second signals corresponding to a number of selected wireless devices. The number of selected wireless devices is no greater than the predetermined number of first signals. The access point initiates wireless communications with at least one of the selected wireless devices using a second wireless communication mode (“SCM”). When using the SCM, the access point employs the second communication matrix to resolve multiple wireless communications from the selected wireless devices and each of the selected wireless devices employs the corresponding first communication matrix to resolve multiple wireless communications from the access point during a single time slot over a radio channel.

Claims

1. A system, comprising:

an access point transmitting a predetermined number of first signals using a first wireless communication mode (“

FCM”

), the predetermined number of the first signals corresponding to a number of transmitting antennas of the access point, the FCM providing a time slot for each of the first signals to be transmitted; and

a plurality of wireless devices receives each of the first signals, each wireless device utilizes the first signals to generate a first communication matrix;

wherein each of the wireless devices transmits a second signal to the access point,

wherein the access point generates a second communication matrix as a function of the second signals corresponding to a number of selected wireless devices, the number being no greater than the predetermined number,

wherein the access point initiates wireless communications with at least one of the selected wireless devices using a second wireless communication mode (“

SCM”

), and

wherein, when using the SCM, the access point employs the second communication matrix to resolve multiple wireless communications from the selected wireless devices and each of the selected wireless devices employs the corresponding first communication matrix to resolve multiple wireless communications from the access point during a single time slot over a radio channel.

2. The system of claim 1, wherein each of the first signals includes a first identifier identifying the corresponding transmitting antenna.

3. The system of claim 2, wherein the first communication matrix includes the first identifier from each of the first signals.

4. The system of claim 1, wherein the time slot is obtained by the access point using a carrier sense multiple access (“

CSMA”

) mechanism.

5. The system of claim 1, wherein the predetermined number of first signals is at least two.

6. The system of claim 1, wherein each of the wireless devices is one of a cell phone, a scanner, a laptop, a network interface card, a PDA and a handheld computer.

7. The system of claim 1, wherein the access point comprises:

a plurality of transmitting antennas;

a plurality of transceivers coupled to the transmitting antennas; and

a processor coupled to the transceivers.

8. The system of claim 1, wherein each of the wireless devices comprises:

a plurality of antennas;

a plurality of receivers coupled to the antennas;

a transmitter coupled to the antennas; and

a processor coupled to the receivers and the transmitter.

9. The system of claim 2, wherein each of the second signals includes a second identifier identifying a corresponding wireless device.

10. The system of claim 9, wherein the first and second identifiers are vectors.

11. The system of claim 1, wherein the access point updates the second communication matrix after one of at least one time slot and a refresh period.

12. The system of claim 1, wherein the FCM utilizes an IEEE 802.11 standard and the SCM utilizes a multiple-in-multiple-out (“

MIMO”

) mode.

13. A method, comprising:

transmitting, by an access point, a predetermined number of first signals using a first wireless communication mode (“

FCM”

), the predetermined number of the first signals corresponding to a number of transmitting antennas of the access point, the FCM providing a time slot for each of the first signals to be transmitted;

receiving, by a plurality of wireless devices, each of the first signals, each wireless device utilizes the first signals to generate a first communication matrix;

transmitting, by each of the wireless devices, a second signal to the access point;

generating, by the access point, a second communication matrix as a function of the second signals corresponding to a number of selected wireless devices, the number being no greater than the predetermined number;

initiating, by the access point, wireless communications with at least one of the selected wireless devices using a second wireless communication mode (“

SCM”

);

when using the SCM, resolving, by the access point, multiple wireless communications from the selected wireless devices in a single time slot over a radio channel using the second communication matrix; and

when using the SCM, resolving, by each of the selected wireless devices, multiple wireless communications from the access point in a further single time slot over the radio channel using the corresponding first communication matrix.

14. The method of claim 13, further comprising:

extracting, by each of the wireless devices, a first identifier from each of the first signals, the first identifier identifying a corresponding transmitting antenna of the access point.

15. The method of claim 14, further comprising:

constructing the first communication matrix with each of the first identifiers.

16. The method of claim 13, wherein the time slot is obtained by the access point using a carrier sense multiple access (“

CSMA”

) mechanism.

17. The method of claim 13, wherein the predetermined number is at least two.

18. The method of claim 13, further comprising:

extracting, by the access point, a second identifier from each of the second signals, the second identifier identifying a corresponding wireless device.

19. The method of claim 18, further comprising:

constructing the second communication matrix with the second identifier from each of the selected wireless devices.

20. The method of claim 13, wherein each of the wireless devices is one of a cell phone, a scanner, a laptop, a network interface card, a PDA and a handheld computer.

21. The method of claim 13, further comprising:

updating, by the access point, the second communication matrix after one of at least one time slot and a refresh period.

22. The method of claim 13, wherein the FCM utilizes an IEEE 802.11 standard and the SCM utilizes a multiple-in-multiple-out (“

MIMO”

) mode.