Random access heterogeneous MIMO network

• US 9,225,402 B2
• Filed: 07/31/2012
• Issued: 12/29/2015
• Est. Priority Date: 07/31/2011
• Status: Active Grant

• Current Assignee: Massachusetts Institute of Technology
• Original Assignee: Massachusetts Institute of Technology
• Inventors: Gollakota, Shyamnath, Katabi, Dina, Lin, Ching-Ju
• Primary Examiner(s): Jain, Raj
• Application Number:
  US13/562,907
• Publication Number:
  US 20130064114A1
• Time in Patent Office: 1,246 Days
• Field of Search: 370/252, 370/329, 370/315, 455/561, 455/523
• US Class Current: 1/1
• CPC Class Codes: H04B 5/28 using the near field of leaky cables, e.g. of leaky coaxial cables
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14

Abstract

A number of techniques, which may be used together, provide distributed coordination of multiple stations so that concurrent transmissions and increased throughput are achieved on a shared radio medium. Each of the techniques provides a separate innovation that can be used alone or in combination with one or more of the other techniques.

Claims

1. A communication method comprising:

monitoring one or more transmissions received at multiple antennas over a communication medium;

determining a first relationship between signals received from the antennas;

determining whether the determined relationship is compatible with transmission of an information bearing signal via the multiple antennas concurrently with the one or more transmissions;

determining a second relationship between signals for transmission via each of the multiple antennas according to the determined first relationship between signals received from the antenna; and

sending a transmission from said antennas according to the determined second relationship concurrently with the one or more transmissions on the medium.

2. The method of claim 1 wherein the communication medium comprises a radio communication medium.

3. The method of claim 1 comprises determining a dimensionality of one or more transmission.

4. The method of claim 3 wherein determining the dimensionality comprises determining a number of data streams.

5. The method of claim 3 wherein determining the dimensionality comprises determining a dimensionality of transmissions without requiring decoding of said transmissions.

6. The method of claim 1 wherein determining whether the determined relationship is compatible comprises determining whether a number of antennas exceeds a dimensionality of the one or more transmissions.

7. The method of claim 6 wherein the number of antennas comprises at least one of a number of antennas available for transmitting and a number of antennas available for receiving the transmission.

8. The method of claim 1 further comprising:

sending a transmission from said antennas according to the determined second relationship concurrently with the one or more transmissions on the medium.

9. A communication method comprising:

determining a first relationship between signals received at multiple antennas of a first station from one or more transmissions over a communication medium;

determining, according to the first relationship, a second relationship between signals suitable for reception of an information bearing transmission at said antennas concurrently with said one or more transmissions;

sending information over the medium from the station sufficient for another multiple antenna system to form a transmission that matches the second relationship; and

receiving a concurrent transmission from the another multiple antenna system according to the second relationship.

10. The method of claim 9 further comprising receiving a request to transmit from the other station, and in response sending the information as an indication that the other station is clear to send a concurrent transmission to the first station according to the second relationship.

11. The method of claim 9 wherein receiving the concurrent transmission includes cancelling an effect of the one or more transmissions.

12. The method of claim 9 wherein sending the information over the medium comprises broadcasting said information for reception at multiple other stations.

13. The method of claim 12 wherein the information is further sufficient for another station to form a transmission that matches the first relationship.

14. The method of claim 12 wherein the information is further sufficient for another station to form a transmission that is substantially cancelled at the multiple antenna of the first station.