Channel optimization in half duplex communications systems

• US 9,001,689 B1
• Filed: 01/24/2014
• Issued: 04/07/2015
• Est. Priority Date: 01/24/2014
• Status: Active Grant

• Current Assignee: Mimosa Networks, Inc. (Airspan Networks Inc.)
• Original Assignee: Mimosa Networks, Inc. (Airspan Networks Inc.)
• Inventors: Hinman, Brian, Gurevich, David, Ponnampalam, Vishakan, Wong, Chiu Ngok Eric, Keskinen, Miika
• Primary Examiner(s): Kizou, Hassan
• Assistant Examiner(s): DAYA, TEJIS A
• Application Number:
  US14/164,081
• Time in Patent Office: 438 Days
• Field of Search: None
• US Class Current: 370/252
• 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
• CPC Class Codes: H04L 5/0033 each allocating device acting autonomously, i.e. without negotiation with other allocating devices
• CPC Class Codes: H04L 5/16 Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

Channel Optimization in Half Duplex Communications Systems is provided herein. Methods may include obtaining at a first terminal, radio frequency (RF) spectral information local to the first terminal, analyzing at the first terminal, RF spectral information for a second terminal that is not co-located with the first terminal, transmitting data to the second terminal on a second terminal optimal frequency band, and receiving data from the second terminal on the first terminal optimal frequency band, where the first terminal optimal frequency being based upon the RF spectral information local to the first terminal.

Claims

1. A method for transmitting data between network devices using channel optimization in half duplex communications, the method comprising:

obtaining at a first terminal, radio frequency (RF) spectral information local to the first terminal;

analyzing at the first terminal, RF spectral information for a second terminal that is not co-located with the first terminal;

transmitting data to the second terminal on a second terminal optimal frequency band; and

receiving data from the second terminal on a first terminal optimal frequency band, the first terminal optimal frequency band being based upon the RF spectral information local to the first terminal, wherein the first terminal optimal frequency band is selected at the first terminal by analyzing the RF spectral information for the first terminal to determine a signal-to-noise ratio, an error vector magnitude, an interference plus noise power spectrum, and an overlapping basic service set traffic activity.

2. The method according to claim 1, wherein the first terminal and the second terminal each determine their respective RF spectral information by any of:

scanning the local RF spectral information on a periodic basis;

scanning the local RF spectral information upon determining a loss of signal quality; and

upon receiving a request from a network device to scan for local RF spectral information, wherein the first and second terminals are network devices.

3. The method according to claim 1, wherein the first terminal optimal frequency band includes a frequency band having maximum available throughput for a wireless link established between the first terminal and the second terminal, as determined from analysis of local RF spectral information.

4. The method according to claim 1, wherein the first terminal optimal frequency and the second terminal optimal frequency are different from one another.

5. The method according to claim 1, further comprising any of:

transmitting, by the first terminal, the radio frequency (RF) spectral information for the first terminal; and

receiving, by the first terminal, the radio frequency (RF) spectral information for the second terminal.

6. The method according to claim 5, further comprising analyzing the radio frequency (RF) spectral information for the second terminal to determine the second terminal optimal frequency band.

7. The method according to claim 1, further comprising encapsulating the radio frequency (RF) spectral information for the first terminal in a management frame and transmitting the management frame over a wireless link to additional terminals.

8. The method according to claim 1, further comprising receiving from the second terminal the second terminal optimal frequency band for the second terminal.

9. A dual channel network device, comprising:

a time division duplexing interface for transmitting or receiving data on a first channel;

a time division duplexing and frequency division duplexing interface for transmitting or receiving data on a second channel;

a processor; and

a memory for storing executable instructions, the processor executing the instructions to perform operations comprising;

determining radio frequency (RF) spectral information local to the device;

selecting at the device an optimal frequency band for the first channel based upon the RF spectral information;

selecting at the device an optimal frequency band for the second channel based upon the RF spectral information;

transmitting management frames that include the optimal frequency band for the first channel and the optimal frequency band for the second channel to one or more additional devices on a network; and

receiving data from the one or more devices on either of the first and second channels.

10. A terminal device, comprising:

a processor; and

a memory for storing executable instructions, wherein execution of the instructions causes the processor to;

determine radio frequency (RF) spectral information local to the terminal device;

analyze spectral information for one or more additional terminal devices in a network that are not co-located with the terminal device;

determine an optimal frequency band for each of the one or more additional terminal devices by analyzing RF spectral information for each of the one or more additional terminals to determine a signal-to-noise ratio, an error vector magnitude, an interference plus noise power spectrum, and an overlapping basic service set traffic activity;

transmit data to the one or more additional terminal devices using the determined optimal frequency bands; and

receive data from the one or more additional terminal devices on a device optimal frequency band that is based upon the RF spectral information local to the terminal device.

11. The terminal device according to claim 10, wherein the terminal device informs the one or more additional terminals of the device optimal frequency band by transmitting the device optimal frequency band to a network coordinator.

12. The terminal device according to claim 10, wherein the device determines the RF spectral information by any of:

scanning the local RF spectral information on a periodic basis;

scanning the local RF spectral information upon determining a loss of signal quality; and

upon receiving a request from a network device to scan for local RF spectral information, wherein the network device includes any of a network coordinator or the one or more additional terminals.

13. The terminal device according to claim 10, wherein the optimal frequency band includes a frequency band having maximum available throughput for a wireless link, as determined from analysis of local RF spectral information.

14. The terminal device according to claim 10, wherein the device optimal frequency band and the device optimal frequency bands are different from one another.

15. The terminal device according to claim 10, wherein the terminal device is further configured to:

transmit the radio frequency (RF) spectral information for the terminal device to the one or more additional terminals; and

receive radio frequency (RF) spectral information for the one or more additional terminals.

16. The terminal device according to claim 15, wherein the terminal device is further configured to request updated RF spectral information from the one or more additional terminals.

17. The terminal device according to claim 10, wherein the terminal device is further configured to encapsulate the radio frequency (RF) spectral information in a management frame, and transmit the management frame over a wireless link to the one or more additional terminals.

18. The terminal device according to claim 10, wherein the terminal device is further configured to receive from at least a portion of the one or more additional terminals, a desired optimal frequency band in lieu of the RF spectral information.