Temporospatial software-defined networking for NGSO satellite networks

Patent metadata

Field	Value
Publication number	US-10374695-B2
Application number	US-201815954922-A
Country	US
Kind code	B2
Filing date	Apr 17, 2018
Priority date	May 26, 2017
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

The disclosure provides for a system that includes a network controller. The network controller is configured to receive information from nodes of a network, where nodes include one node that is in motion relative to another node. The network controller is also configured to generate a table representing nodes, available storage at each node, and possible links in the network over a period of time based on the information, and determine a series of topologies of the network based on the table. Based on received client data including a data amount, the network controller is configured to determine flows for the topology. The network controller then is configured to generate a schedule of network configurations based on the flows, and send instructions to the nodes of the network for implementing the network configurations and transmitting client data.

First claim

The invention claimed is:

1. A system comprising:
a network controller configured to:
receive information from a plurality of nodes of a network, the plurality of nodes including a first node that is in motion relative to a second node;
generate a table representing nodes, available storage at each node, and possible links in the network over a period of time based on the received information;
determine a series of topologies of the network over the period of time based on the generated table;
receive client data information from one or more client devices, the client data information including a data amount;
determine a plurality of flows for the determined series of topologies based on at least the data amount and the available storage at each node, each of the plurality of flows comprising one or more requirements for a routing path through the network;
generate a schedule of network configurations for the determined series of topologies based on the determined plurality of flows; and
send instructions to the plurality of nodes of the network for implementing the schedule of network configurations and transmitting client data over the period of time.

2. The system of claim 1 , further comprising the plurality of nodes.

3. The system of claim 1 , wherein the plurality of nodes include one or more ground stations and one or more high-altitude platforms.

4. The system of claim 1 , wherein the plurality of nodes are configured to perform free-space optical communication.

5. The system of claim 1 , wherein the schedule of network configurations includes a first network configuration, a second network configuration scheduled to follow the first network configuration, a first routing path having a first portion between a first node and a second node and a second portion between the second node and a third node, and the first portion of the first routing path being a part of the first network configuration and the second portion of the first routing path being a part of the second network configuration.

6. The system of claim 5 , wherein the second node has enough available storage to store the data amount, and the second portion of the first routing path beings at the second node and the second node is configured to store the client data before transmitting the client data via the second portion of the routing path.

7. The system of claim 6 , wherein the second network configuration includes a newly established link between the second node and a next hop in the second portion of the routing path.

8. The system of claim 7 , wherein the second node is in motion relative to the next hop in the second portion of the routing path.

9. The system of claim 5 , wherein the network controller is further configured to:
determine that there are no routes between the first node and the third node in each topology in the series of topologies; and
generate the schedule of network configurations in response to determining that there are no routes between the first node and the third node in each topology in the series of topologies.

10. The system of claim 1 , wherein the network controller is configured to determine a plurality of flows for the determined series of topologies based on at least the data amount and the available storage at each node by:
identifying a given node having enough available storage to store the data amount; and
determining at least one flow including the given node in which the given node is used to store the client data for a period of time in the at least one flow.

11. A method comprising:
receiving, by a network controller for a network, information from a plurality of nodes of the network, the plurality of nodes including a first node that is in motion relative to a second node;
generating, by the network controller, a table representing nodes, storage capacity of each node, and possible links in the network over a period of time based on the received information;
determining, by the network controller, a series of topologies of the network over the period of time based on the generated table;
receiving, by the network controller, client data information from one or more client devices, the client data information including a data amount;
determining, by the network controller, a plurality of flows for the determined series of topologies based on at least the data amount and the storage capacity of each node, each of the plurality of flows comprising one or more requirements for a routing path through the network;
generating, by the network controller, a schedule of network configurations for the determined series of topologies based on the determined plurality of flows; and
sending, by the network controller, instructions to the plurality of nodes of the network for implementing the schedule of network configurations and transmitting client data over the period of time.

12. The method of claim 11 , wherein the schedule of network configurations includes a first network configuration, a second network configuration scheduled to follow the first network configuration, a first routing path having a first portion between a first node and a second node and a second portion between the second node and a third node, the first portion of the first routing path being a part of the first network configuration and the second portion of the routing path being a part of the second network configuration.

13. The method of claim 12 , wherein the second node has enough available storage to store the data amount, and the second portion of the first routing path beings at the second node, and the second node is configured to store the client data before transmitting the client data via the second portion of the routing path.

14. The method of claim 13 , wherein the second network configuration includes a newly established link between the second node and a next hop in the second portion of the routing path.

15. The method of claim 14 , wherein the second node is in motion relative to the next hop in the second portion of the routing path.

16. The method of claim 12 , further comprising:
determining, by the network controller, that there are no routes between the first node and the third node in each topology in the series of topologies; and
generating, by the network controller, the schedule of network configurations in response to determining that there are no routes between the first node and the third node in each topology in the series of topologies.

17. The method of claim 11 , wherein determining a plurality of flows for the determined series of topologies based on at least the data amount and the available storage at each node includes:
identifying a given node having enough available storage to store the data amount; and
determining at least one flow including the given node in which the given node is used to store the client data for a period of time in the at least one flow.

18. A non-transitory, tangible computer-readable storage medium on which computer readable instructions of a program are stored, the instructions, when executed by a network controller for a network, cause the network controller to perform a method, the method comprising:
receiving information from a plurality of nodes of the network, the plurality of nodes including a first node that is in motion relative to a second node;
generating a table representing nodes, storage capacity of each node, and possible links in the network over a period of time based on the received information;
determining a series of topologies of the network over the period of time

Assignees

• Loon Llc

Inventors

• Barritt Brian

Classifications

• H04B7/18521

  Systems of inter linked satellites, i.e. inter satellite service (for optical links between satellites H04B10/118) · CPC title

• H04B7/1851

  Systems using a satellite or space-based relay (H04B7/18508, H04B7/18521 take precedence; providing specific services H04B7/18523 - H04B7/18576) · CPC title

• H04L45/021

  Ensuring consistency of routing table updates, e.g. by using epoch numbers · CPC title

• H04B10/1123

  Bidirectional transmission · CPC title

• H04B10/118

  specially adapted for satellite communication · CPC title