# US 8,787,150 B2 · Resiliency schemes in communications networks

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- Number: US 8,787,150 B2
- Document ID: US8787150B2
- Status: Granted
- Kind: B2
- Application number: 12/443,708
- Filed: 2006-10-09
- Published: 2010-01-07
- Granted: 2014-07-22
- Earliest claimed: 2006-10-09
- Assignees: Telefonaktiebolaget L M Ericsson (publ)
- Applicants: Raoul Fiorone; Riccardo Martinotti; Andrea Corti
- Inventors: Raoul Fiorone; Riccardo Martinotti; Andrea Corti
- Web page: https://patentgrep.com/patent/US8787150B2

## CPC

- H04B 1/0458: {Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages (matching circuits in general H03H)}
- H04B 1/18: Input circuits, e.g. for coupling to an antenna or a transmission line (coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H)
- H04L 12/4633: {Interconnection of networks using encapsulation techniques, e.g. tunneling}
- H04L 41/06: Management of faults, events, alarms or notifications
- H04L 43/0811: by checking connectivity
- H04L 45/00: Routing or path finding of packets in data switching networks (routing or path finding in wireless networks H04W40/00)
- H04L 45/22: {Alternate routing}
- H04L 45/28: using route fault recovery
- H04L 45/50: using label swapping, e.g. multi-protocol label switch [MPLS]
- H04L 47/70: Admission control; Resource allocation
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A connection oriented communications network has a plurality of nodes including a plurality of edge nodes. The network is arranged to define a primary tunnel connecting a primary one of the edge nodes to another edge node and a secondary tunnel connecting a secondary one of the edge nodes to another edge node. The network is arranged to enable switching of traffic from the primary tunnel to the secondary tunnel in the event of detection of a failure in the primary tunnel.

## Claims

### Claim 1

A connection oriented communications network comprising:
a plurality of nodes including a plurality of edge nodes, the network configured to:
define a primary tunnel communicatively connecting together a primary pair of the edge nodes;
define a secondary tunnel communicatively connecting together a secondary pair of the edge nodes that is different from the primary pair of the edge nodes; and
control customer equipment, via an instruction sent by a first ingress node or a second ingress node to the customer equipment, to switch traffic from the primary tunnel to the secondary tunnel responsive to detecting a failure affecting the primary tunnel.

### Claim 2 (depends on 1)

The network of claim 1 wherein the primary and secondary tunnels have different egress nodes.

### Claim 3 (depends on 1)

The network of claim 1 wherein the primary and secondary tunnels have different ingress nodes.

### Claim 4 (depends on 1)

The network of claim 1 wherein at least two of the edge nodes are configured to communicate with each other to identify a failure that requires a switch to the secondary tunnel.

### Claim 5 (depends on 4)

The network of claim 4 wherein the at least two edge nodes comprise an ingress node and an egress node of the primary tunnel.

### Claim 6 (depends on 4)

The network of claim 4 wherein the at least two edge nodes comprise a node of the primary tunnel and a node of the secondary tunnel.

### Claim 7 (depends on 4)

The network of claim 4 wherein the at least two edge nodes comprise the ingress node of the primary tunnel and the ingress node of the secondary tunnel.

### Claim 8 (depends on 4)

The network of claim 4 wherein the at least two edge nodes comprise the egress node of the primary tunnel and the egress node of the secondary tunnel.

### Claim 9 (depends on 1)

The network of claim 1 further comprising:
a plurality of ingress nodes;
a plurality of egress nodes; and
a tunnel defined between each of the ingress nodes and each of the egress nodes.

### Claim 10

A node for a connection oriented network having a plurality of edge nodes, the node configured to:
identify a primary tunnel communicatively connecting a primary pair of edge nodes;
identify a secondary tunnel communicatively connecting a secondary pair of the edge nodes that are different from the primary pair of edge nodes; and
control customer equipment, via an instruction sent by a first ingress node or a second ingress node to the customer equipment, to switch traffic from the primary tunnel to the secondary tunnel responsive to detecting a failure affecting the primary tunnel.

### Claim 11 (depends on 10)

The node of claim 10 wherein the node comprises an edge node configured to communicate with one or more other edge nodes in the network to identify a failure in the network that requires switching the traffic to the secondary tunnel.