Optical/radio local access network

• US 9,571,190 B2
• Filed: 02/25/2014
• Issued: 02/14/2017
• Est. Priority Date: 04/14/2000
• Status: Expired due to Fees

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Britz, David M., Dodley, Jeevan, Lin, Lih-Yuan, Miller, Robert R.
• Primary Examiner(s): CURS, NATHAN M
• Application Number:
  US14/189,721
• Publication Number:
  US 20140226976A1
• Time in Patent Office: 1,085 Days
• US Class Current: 1/1
• CPC Class Codes: H04B 10/0795 Performance monitoring; Measurement of transmission parameters
• CPC Class Codes: H04B 10/11 Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
• CPC Class Codes: H04B 10/1123 Bidirectional transmission
• CPC Class Codes: H04B 10/1125 using a single common optical path
• CPC Class Codes: H04J 14/02 Wavelength-division multiplex systems
• CPC Class Codes: H04Q 11/0067 Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
• CPC Class Codes: H04Q 2011/0026 using free space propagation (e.g. lenses, mirrors)
• CPC Class Codes: H04Q 2011/0081 Fault tolerance; Redundancy; Recovery; Reconfigurability

Abstract

A system that incorporates teachings of the subject disclosure may include, for example, a central controller that executes instructions facilitating performance of operations including monitoring multiple network nodes, at least some of the network nodes being in communication with others through respective point-to-point links. Each point-to-point link includes a respective free space optical channel. The central controller detects optical received signal strength of a free space optical channel falling below a certain level and provides control signals to reconfigure the multiple network nodes. Signals are re-routed along one of the respective point-to-point links through other network nodes responsive to detecting the optical received signal strength falling below the certain level Other embodiments are disclosed.

Claims

1. A method, comprising:

detecting, by a controller, an optical received signal strength of a first free space optical channel falling below a certain level, wherein the first free space optical channel provides a communications link between network nodes;

providing, by the controller, control signals to reconfigure the network nodes by sending commands, wherein the commands are sent by way of radio telephone communication; and

re-routing, by the controller, signals for the network nodes along a second free space optical channel responsive to detecting the optical received signal strength falling below the certain level.

2. The method of claim 1, further comprising coupling a central controller to each of the network nodes over a radio telephone system.

3. The method of claim 1, wherein each of the network nodes performs routing of signals from a plurality of in-ports of a switch into a plurality of out-ports of the switch.

4. The method of claim 1, wherein each of the network nodes is in communication via respective point-to-point links, and wherein each of the respective point-to-point links includes a first channel for coupling to a first network node of the network nodes through a receive path and a second channel for coupling to a second network node of the network nodes through a transmit path.

5. The method of claim 1, further comprising detecting an alarm.

6. The method of claim 1, wherein the detecting of the optical received signal strength of the first free space optical channel falling below a level is indicative of adverse link conditions along a respective point-to-point link that provides the communication link between the network nodes.

7. The method of claim 1, wherein the re-routing of the signals for the network nodes along the second free space optical channel comprises causing a switch to direct signals between one of a plurality of input ports to one of a plurality of output ports.

8. A method, comprising:

detecting, by a controller within a wireless network, an optical received signal strength of a free space optical channel of a network route falling below a threshold level, wherein the network route comprises a first group of nodes of a plurality of nodes of the wireless network; and

initiating, by the controller in communication with the plurality of nodes of the wireless network, a reconfiguration of the plurality of nodes of the wireless network according to an alternative network route responsive to the detecting of the optical received signal strength falling below the threshold level, wherein the initiating of the reconfiguration of the plurality of nodes comprises sending commands by way of radio telephone communication.

9. The method of claim 8, wherein the optical received signal strength falling below the threshold level is a result of an adverse environmental condition, and further comprising selecting of the alternative network route for bypassing the adverse environmental condition.

10. The method of claim 8, further comprising communicating with the first group of nodes of the plurality of nodes of the wireless network by way of cellular radio telephone communication.

11. The method of claim 8, further comprising:

generating an alarm responsive to the optical received signal strength falling below the threshold level; and

transmitting the alarm to the controller by way of the radio telephone communication.

12. The method of claim 8, wherein the initiating of the reconfiguration of the plurality of nodes of the wireless network according to the alternative network route comprises sending signals over a radio telephone link.

13. A communication node comprising:

a free space communication device to selectively communicate with a first network node of a plurality of network nodes by way of a free space optical channel;

a radio frequency communication device to selectively communicate with the first network node by way of a radio frequency channel;

a signal monitor in communication with each of the free space communication device and the radio frequency communication device, to monitor channel losses in one of the free space optical channel, the radio frequency channel or both, wherein the channel losses are indicative of a failure in a received signal resulting from an environmental factor;

a first switch in communication with the free space communication device, the radio frequency communication device and the signal monitor, wherein the first switch causes an exchange of data with the first network node in the free space optical channel if the environmental factor disrupts the radio frequency channel but not the free space optical channel, and an exchange of data with the first network node in the radio frequency channel if the environmental factor disrupts the free space optical channel but not the radio frequency channel; and

a second switch in communication with the first switch, to selectively direct the exchange of data between the first network node and a second network node of the plurality of network nodes, wherein operation of the second switch to selectively direct the exchange of data is responsive to commands received from a central controller.

14. The communication node of claim 13, further comprising a wireless transceiver in communication with the central controller, to receive the commands from the central controller.

15. The communication node of claim 14, wherein the wireless transceiver is a radio telephone transceiver.

16. The communication node of claim 13, wherein the second switch comprises a plurality of in-ports and a plurality of out-ports, wherein the second switch performs routing of signals from the plurality of in-ports into the plurality of out-ports.

17. The communication node of claim 13, further comprising an optical receiver in communication between the free space communication device and the signal monitor, to generate an alarm responsive to a signal strength of the received signal falling below a threshold level.

18. The communication node of claim 13, wherein detecting an optical received signal strength of the free space optical channel falling below a threshold level is indicative of adverse link conditions along a point-to-point link between the communication node and the second network node of the plurality of network nodes.