Collaborative communication for wireless local area networks

• US 20070060157A1
• Filed: 02/03/2006
• Published: 03/15/2007
• Est. Priority Date: 02/04/2005
• Status: Active Grant

• Current Assignee: Four Batons Wireless LLC
• Original Assignee: Telcordia Technologies Incorporated (Telefonaktiebolaget LM Ericsson), Toshiba American Research, Inc. (Toshiba Corporation)
• Inventors: Famolari, David, Gopalakrishnan, Praveen, Kodama, Toshikazu, Medepalli, Kamesh
• Granted Patent: US 7,843,867 B2
• Time in Patent Office: Days
• US Class Current: 455/450
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user

Abstract

A helper station system is disclosed that can enhance communications in a wireless network having at least one slow or unreliable link. In preferred embodiments, the helper station system includes at least one helper station configured to wirelessly re-transmit an original wireless transmission from at least one sender station to at least one access point without having to re-contend for access to the wireless medium.

Claims

1. A helper station system for enhancing communications in a wireless network, comprising:

at least one helper station configured to wirelessly re-transmit an original wireless transmission from at least one sender station to at least one access point without having to re-contend for access to the wireless medium.

2. The system of claim 1, wherein said at least one helper station is configured to re-transmit the transmission within a same packet cycle of the original transmission.

3. The system of claim 1, wherein said at least one helper station is configured to re-transmit said original transmission at a faster rate than said at least one sender station.

4. The system of claim 1, wherein said wireless network includes a WLAN.

5. The system of claim 1, wherein said wireless network includes an 802.11 network architecture.

6. The system of claim 1, wherein said at least one sender station is configured to become aware of the presence of said at least one helper station and to increase its transmission rate based on such awareness.

7. The system of claim 1, wherein said at least one helper station is configured to determine if said original transmission received from said at least one sender station requires help.

8. The system of claim 1, wherein said at least one helper station is configured to effect re-transmission in the absence of an acknowledgement signal from the access point within a certain time period.

9. The system of claim 1, wherein said at least one helper station is configured to process received packets of said original transmission, irrespective of whether destination addresses of said received packets match its own MAC address.

10. The system of claim 1, wherein said at least one helper station is configured to ignore a duration field in received packets of said original transmission and to not update a NAV vector.

11. The system of claim 1, wherein said at least one helper station is configured to determine if the access point has not received the original transmission, and is configured such that if the helper station determines that the access point has received the original transmission, the helper station drops the original transmission, and such that if the helper station determines that the access point has not received the original transmission, the helper station re-transmits the original transmission to the access point.

12. The system of claim 11, wherein the helper station is configured such that if the helper station determines that the access point has not received the original transmission, the helper station re-transmits the original transmission to the access point after the helper station decodes the original transmission.

13. The system of claim 11, wherein the helper station is configured such that if the helper station determines that the access point has not received the original transmission, the helper station re-transmits the original transmission while maintaining the MAC address the same as that of the original transmission.

14. A method for enhancing communications in a wireless network, comprising:

a) transmitting an original transmission from at least one sender station to at least one access point at a first transmission rate; and

b) receiving said original transmission at at least one helper station configured to re-transmit said first transmission to said access point at a second transmission rate that is substantially faster than said first transmission rate without having to re-contend for access over the wireless medium.

15. The method of claim 14, further including causing said sender station to be aware of the presence of said at least one helper station and increasing the sender station'"'"'s transmission rate based on such awareness.

16. The method of claim 14, further including having said helper station determine if said original transmission received from said at least one sender station requires help.

17. The method of claim 14, further including having said helper station effect re-transmission in the absence of an acknowledgement signal from the access point within a certain time period.

18. The method of claim 14, further including having said at least one helper station determine if the access point has not received the original transmission, and if the helper station determines that the access point has received the original transmission, having the helper station drop the transmission, and if the helper station determines that the access point has not received the original transmission, having the helper station re-transmit the original transmission to the access point.

19. A system for enhancing communications in a wireless network, comprising:

a) a sender station configured to send a transmission to an access point on a wireless network;

b) said sender station being configured to be aware of the presence of a helper station that is configured to re-transmit an original transmission from said sender station to at least one access point without having to contend for access over a wireless medium; and

c) said sender station being configured to increase its rate of transmission to said access point based on being aware of the presence of the helper station and in reliance on said helper station.

20. The system of claim 19, further including at least one helper station that is configured to re-transmit the original transmission without having to re-contend for access to the wireless medium.