Route updating in ad-hoc networks
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsTony Larsson, Per Johansson, Johan Sörensen
Life of this patent
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Abstract
In conventional ad-hoc networks using reactive routing protocols the route between the source node and the destination node is not updated until the route is actually broken. In response to predetermined events a request for updated route message can be sent to the destination node to determine if another route exists between the source node and the destination node. A reply to the request for updated route can be provided by either the destination node or by a node which has a cached route between the source node and the destination node. This updated route request scheme can be implemented in networks which use source routing and networks which use distance vector routing.
Claims28
In an ad-hoc network, a method for updating a route between a source node and a destination node, the method comprising the steps of:
- exchanging information between the source node and the destination node over a first route;
- determining, in the source node, whether a predetermined event has occurred;
- broadcasting a request for updated route message if the predetermined event has occurred;
- receiving the request for updated route message at a neighbor node;
- determining whether the neighbor node is the destination node;
- and
- generating and sending a reply message from the neighbor node if the neighbor node is the destination node,
- wherein the network uses a reactive routing protocol and wherein the source node and destination node continue to use the first route to exchange information until another route is established.
In an ad-hoc network, an arrangement for updating a route between a source node and a destination node, the arrangement comprising:
- a source node comprising:
- means for exchanging information between the source node and the destination node over a first route;
- means for determining whether a predetermined event has occurred;
- and
- means for broadcasting a request for updated route message if the predetermined event has occurred;
- a neighbor node comprising:
- means for receiving the request for updated route message;
- means for determining whether the neighbor node is the destination node;
- and
- means for generating and sending a reply message from the neighbor node if the neighbor node is the destination node,
- wherein the network uses a reactive routing protocol and wherein the source node and destination node continue to use the first route to exchange information until another route is established.
Dependencies are inferred from the claim text.