Wireless network scheduling data frames including physical layer configuration

• US 7,224,704 B2
• Filed: 08/16/2002
• Issued: 05/29/2007
• Est. Priority Date: 04/01/2002
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Ho, Jin-Meng, Lu, Xiaolin
• Primary Examiner(s): Duong; Frank
• Application Number:
  US10/222,477
• Publication Number:
  US 20030185241A1
• Time in Patent Office: 1,747 Days
• Field of Search: None
• US Class Current: 370/476
• CPC Class Codes: H04B 7/2603 Arrangements for wireless physical layer control H04B7/2612 takes precedence
• CPC Class Codes: H04W 8/245 from a network towards a terminal

Abstract

A wireless network is disclosed in which individual wireless stations can be configured to implement any of a plurality of physical configurations including antenna configurations. Such antenna configurations may include, without limitation, multiple input multiple output (MIMO) and single input single output (SISO). Different types of MIMO configurations can also be implemented such as open loop MIMO and closed loop MIMO.

Claims

1. A method of implementing communication frames in a wireless network having a plurality of wireless devices, some of said devices have different physical layer configurations than other of said devices, comprising:

(a) forming a polling frame including at least one bit in which physical layer configuration information is encoded, said configuration information being capable of specifying whether a single input single output (SISO) antenna configuration is to be used or a multiple input multiple output (MIMO) antenna configuration is to be used;

(b) transmitting said polling frame to a receiving device for decoding by said receiving device; and

(c) configuring a physical layer of said receiving device in accordance with the physical layer configuration information contained in the polling frame;

wherein said polling frame also causes the receiving device to determine whether it has information to return.

2. The method of claim 1 wherein the polling frame includes more than one bit in which the physical configuration information is encoded.

3. The method of claim 1 wherein the polling frame includes two bits in which the physical configuration information is encoded.

4. The method of claim 3 wherein the two bits are used to encode retry and power management information in non-polling frames.

5. The method of claim 1 wherein the at least one bit in which the physical layer configuration information is encoded is used for a purpose other than to encode physical layer configuration information in non-polling frames.

6. The method of claim 1 wherein the configuration information specifies whether closed loop MIMO, open loop MIMO or SISO is to be used.

7. A method of implementing communication frames in a wireless network having a plurality of wireless devices, some of said devices have different physical layer configurations than other of said devices, comprising:

(a) forming a non-polling frame including at least one bit in which physical layer configuration information is encoded, said configuration information specifies whether a single input single output (SISO) antenna configuration is to be used or a multiple input multiple output (MIMO) antenna configuration is to be used;

(b) transmitting said non-polling frame to a receiving device for decoding by said receiving device; and

(c) configuring a physical layer of said receiving device in accordance with the physical layer configuration information contained in the non-polling frame.

8. The method of claim 7 wherein the at least one bit comprises a plurality of bits that are also used to encode a value that is indicative of a transmission opportunity time period.

9. The method of claim 7 wherein (a) also includes forming the non-polling frame to include a more bit that specifies whether a subsequent frame of data is to follow the current non-polling frame.

10. The method of claim 9 wherein (c) is performed if said more bit is set to indicate that a subsequent frame of data is to follow the current non-polling frame.

11. A method of coordinating the behavior of a plurality of wireless devices in a wireless network, comprising:

(a) forming a frame to a wireless receiving device to specify the antenna configuration that the receiving device is to use for a subsequent communication;

(b) sending said frame to said receiving device;

(c) receiving said frame by said receiving device;

(d) decoding said frame; and

(e) configuring said receiving device to comport with the antenna configuration specified by said frame.

12. The method of claim 11 wherein said antenna configuration comprises a configuration selected from the group consisting of multiple input multiple output (MIMO) and single input single output (SISO).

13. The method of claim 11 wherein said antenna configuration comprises a configuration selected from the group consisting of open loop multiple input multiple output (MIMO), closed loop MIMO, and single input single output (SISO).

14. An access point usable to communicate across a wireless network, comprising:

a host device;

a medium access control (MAC) sublayer coupled to said host device; and

a physical layer coupled to said MAC sublayer;

wherein said MAC sublayer forms frames to send to wireless receiving stations in said network, said frames specifying the antenna configuration that the receiving stations are to use for a subsequent communication.

15. The access point of claim 14 wherein said antenna configuration comprises a configuration selected from the group consisting of multiple input multiple output (MIMO) and single input single output (SISO).

16. The access point of claim 14 wherein said antenna configuration comprises a configuration selected from the group consisting of open loop multiple input multiple output (MIMO), closed loop MIMO, and single input single output (SISO).

17. The access point of claim 14 wherein said antenna configuration is encoded in a plurality of bits in said frames that are also used for other purposes than encoding antenna configuration.