Channel optimization in half duplex communications systems

• US 10,616,903 B2
• Filed: 11/10/2017
• Issued: 04/07/2020
• 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 L., Gurevich, David, Keskinen, Miika, Ponnampalam, Vishakan, Wong, Chiu Ngok Eric
• Primary Examiner(s): Daya, Tejis
• Application Number:
  US15/809,968
• Publication Number:
  US 20180084563A1
• Time in Patent Office: 879 Days
• 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 dynamic channel optimization in half duplex communications between network devices, the method comprising:

providing first radio frequency (RF) spectral information to a second terminal, the first RF spectral information being local to a first terminal, the second terminal not being co-located with the first terminal;

determining a second terminal optimal frequency band using second RF spectral information for the second terminal;

transmitting first data to the second terminal using the second terminal optimal frequency band;

receiving second data from the second terminal using a first terminal optimal frequency band, the first terminal optimal frequency band being determined using the first RF spectral information;

selecting another second terminal optimal frequency band using third RF spectral information from the second terminal, the selecting including at least one of maximizing a product or a sum of a forward and reverse link throughput; and

sending third data to the second terminal using the another second terminal optimal frequency band.

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 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 band, the second terminal optimal frequency band, and the another second terminal optimal frequency band are different from each another.

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

receiving, by the first terminal, the second RF spectral information for the second terminal.

6. The method according to claim 1, further comprising:

encapsulating the first RF spectral information for the first terminal in a management frame and transmitting the management frame over a wireless link to additional terminals.

7. The method according to claim 1, further comprising:

alternatively receiving from the second terminal the second terminal optimal frequency band.

8. The method according to claim 1, wherein selecting at the first terminal a first terminal optimal frequency band includes 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.

20. The method of claim 1 further comprising:

selecting a modulation coding scheme using the second RF spectral information.

9. A network coordinator for a network using time division duplexing or time division multiple access, the network coordinator comprising:

a processor; and

a memory storing instructions, the instructions being executable by the processor to perform operations comprising;

establishing a wireless link with a plurality of terminal devices;

receiving from the plurality of terminal devices, respective first radio frequency (RF) spectral information of a plurality of first RF spectral information;

providing the respective first RF spectral information to the plurality of terminal devices;

negotiating a first frequency band for each of the plurality of terminal devices such that a product or a sum of a first forward link and a first reverse link throughput for each of the plurality of terminal devices is jointly maximized on the wireless link, the first forward and first reverse link throughput being determined using analysis of the plurality of first RF spectral information;

getting from the plurality of terminal devices, respective second RF spectral information of a plurality of second RF spectral information;

sending the respective second RF spectral information to the plurality of terminal devices; and

negotiating a second frequency band for each of the plurality of terminal devices such that a product or a sum of a second forward link and a second reverse link throughput for each of the plurality of terminal devices is jointly maximized on the wireless link, the second forward and second reverse link throughput being determined using analysis of the plurality of second RF spectral information.

10. The network coordinator according to claim 9, wherein the processor further executes the instructions to perform an operation of requesting updated RF spectral information from one or more of the plurality of terminal devices when the network coordinator determines that a degradation in signal strength of the one or more of the plurality of terminal devices has exceeded a threshold.

11. The network coordinator according to claim 9, wherein the processor further executes the instructions to perform an operation of assigning a transmission period to each of the plurality of terminal devices.

12. The network coordinator according to claim 11, wherein the plurality of terminal devices operates in half-duplex mode using any of carrier sensing and token exchange rather than requiring the network coordinator to assign transmission periods to the plurality of terminal devices.

13. The network coordinator according to claim 9, wherein at least a portion of the plurality of terminal devices transmit a preferred frequency band in lieu of or in addition to RF spectral information.

14. The network coordinator according to claim 9, wherein the processor further executes the instructions to perform an operation of renegotiating a frequency band for each of the plurality of terminal devices when updated RF spectral information is received from at least one of the plurality of terminal devices.

15. The network coordinator according to claim 9, wherein the network coordinator is a point-to-point device that supports communication between two or more terminal devices or a point-to-multipoint device that supports communication between a first terminal device and a plurality of other terminal devices.

16. The network coordinator according to claim 9, wherein the network coordinator creates management frame for each of the plurality of terminal devices, wherein each management frame includes an optimal receiving frequency and a plurality of optimal transmitting frequencies.

17. A terminal device, comprising:

a processor; and

a memory storing instructions, the instructions being executable by the processor to;

provide first radio frequency (RF) spectral information local to the terminal device to an additional terminal device;

determine a first optimal frequency band for the additional terminal device using first RF spectral information for the additional terminal device, the additional terminal device not being co-located with the terminal device;

transmit first data to the additional terminal device using the first optimal frequency band;

receive second data from the additional terminal device on a second RF optimal frequency band, the second optimal frequency band being computed using the RF spectral information local to the terminal device;

select a third optimal frequency band for the additional terminal device using second RF spectral information from the additional terminal device, the selecting including at least one of maximizing a product or a sum of a forward and reverse link throughput; and

transmit third data to the additional terminal device using the second third optimal frequency band.

18. The terminal device according to claim 17, wherein the terminal device informs the additional terminal device of the device optimal frequency band by transmitting the first and second device optimal frequency bands to a network coordinator.

19. The terminal device according to claim 17, wherein the device determines the first and second RF spectral information by any of:

scanning 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 additional terminal device.