Patent ID: 9509572
Filing Date: 2016-11-29
CPC Classification: H04L

Claim Text:
1. In a node, a presence calculation method comprising: receiving a first presence subscription request for a composite service that comprises a service at the node and a plurality of discrete services at one or more child nodes; sending a second presence subscription request to the one or more child nodes in response to the first subscription request; receiving one or more response messages that comprise a collection of presence state transition delays corresponding to the child nodes from the child nodes in response to the second subscription request; determining one or more communication delays between the node and the child nodes using the response messages; computing a presence state transition delay for the composite service using the collection of presence state transition delays and the communication delays; and determining a composite presence state using a mapping between the presence state transition delay for the composite service and the composite presence state, wherein the presence state transition delay for the composite service indicates an amount of time for the node to transition to an available presence state from another presence state.