Distributed communications for wireless networks

• US 20060262758A1
• Filed: 05/17/2005
• Published: 11/23/2006
• Est. Priority Date: 05/17/2005
• Status: Abandoned Application

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Bangerter, Boyd R., Sandhu, Sumeet
• Application Number:
  US11/131,560
• Publication Number:
  US 20060262758A1
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04B 7/026 Co-operative diversity, e.g. using fixed or mobile stations as relays
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/0668 Orthogonal systems, e.g. using Alamouti codes
• CPC Class Codes: H04L 2001/0092 Error control systems characterised by the topology of the transmission link
• CPC Class Codes: H04W 56/00 Synchronisation arrangements

Abstract

Methods and devices for wireless networks for extending the communications range of an originating device without increasing its transmit power or bandwidth. An originating device may include signaling in a physical (PHY) layer packet such that peer network devices may know to retransmit the received packet substantially in synchronization with one another. The subsequent and substantially simultaneous transmission of the original signal by peer network devices may effectively increase the range of the originating device so a transmission may reach its destination. Various embodiments and implementations are also disclosed.

Claims

1. A method for communicating in a wireless network, the method comprising:

receiving a signal at a first device from a second device;

determining that the signal is for cooperative diversity transmission; and

re-transmitting the signal.

2. The method of claim 1 wherein determining that the signal is for cooperative diversity transmission includes observing an indicator in a physical (PHY) layer packet.

3. The method of claim 1 wherein re-transmitting is substantially synchronized with transmitting of substantially similar signals by one or more peer network devices.

4. The method of claim 1 wherein there is no power normalization between transmissions of the first device, the second device or the one or more peer devices.

5. The method of claim 1 wherein the wireless network comprises a wireless personal area network (WPAN)

6. The method of claim 1 wherein the wireless network comprises a wireless local area network (WLAN)

7. The method of claim 1 wherein the wireless network comprises a wireless metropolitan area network (WMAN).

8. The method of claim 1 wherein re-transmitting is performed using multi-carrier modulation.

9. A method of communicating in a wireless network, the method comprising:

determining that a destination device is outside of a communication range of an originating device; and

generating a transmission for the destination device including signaling to cause two or more peer devices in the wireless network to retransmit the transmission so that it arrives at the destination device substantially at the same time.

10. The method of claim 9 wherein the signaling includes an indicator in a physical (PHY) layer packet that the transmission is for cooperative diversity transmission by the peer devices.

11. The method of claim 9 further comprising broadcasting the transmission using orthogonal frequency division multiplexing (OFDM) modulation.

12. The method of claim 9 wherein determining that the destination device is outside of the communication range comprises failing to receive a response from the destination device in response to a request to send (RTS) message sent by the originating device.

13. A wireless device comprising:

a processing circuit including logic to identify that a received signal is for cooperative diversity transmission and retransmit the received signal at a next transmit opportunity.

14. The wireless device of claim 13 wherein the logic comprises a physical (PHY) layer circuit to detect an indicator in a PHY packet indicating the received signal is for cooperative diversity transmission.

15. The wireless device of claim 13 further comprising a radio frequency (RF) interface in communication with the processing circuit to broadcast and receive signals.

16. The wireless device of claim 15 wherein the RF interface includes at least two antennas for at least one of multiple input or multiple output communication.

17. The wireless device of claim 13 wherein the processing circuit further includes logic to enable the wireless device to serve as an ad-hoc node in a wireless mesh network.

18. The wireless device of claim 13 wherein the received signal is a PHY packet modulated using orthogonal frequency division multiplexing (OFDM).

19. The wireless device of claim 13 wherein the processing circuit further includes logic to encode transmissions for subsequent cooperative diversity transmission by peer network devices.

20. A wireless system comprising:

a processing circuit including logic to resend a received signal substantially in synchronization with one or more peer network devices;

a radio frequency (RF) interface communicatively coupled to the processing circuit; and

at least two antennas coupled to the RF interface for at least one of multiple input or multiple output communication.

21. The wireless system of claim 20 wherein the processing circuit further includes logic to distinguish the received signal as being intended for cooperative diversity transmission.

22. The wireless system of claim 20 wherein the processing circuit further includes logic to generate a transmission having an indicator to cause the one or more peer devices to retransmit the transmission substantially simultaneously.

23. The wireless system of claim 22 wherein the indicator is present in a physical (PHY) layer packet.

24. The wireless system of claim 20 wherein the received signal is resent using orthogonal frequency division multiplexing (OFDM) modulation.