Alcatel Lucent

Marco Tomsu

Jurgen Sienel

Karsten Oberle

Thomas Strauss

Nico Schwan

Peter Domschitz

Marcus Kessler

Marc Drewniok

Marcel Pierer

Andreas Hertle

The invention concerns a method of providing a successor list (L) for routing in a peer-to-peer overlay network (N), and a network node and a computer program product to execute this method. The peer-to-peer overlay network (N) comprises a plurality of nodes (). The successor list (L) specifies identifiers of at least two successor nodes () subsequently succeeding a first node () of the plurality of nodes () with regard to a topology structure of the peer-to-peer overlay network. It is determined whether the at least two successor nodes () listed in the successor list (L) run on the same physical hardware. If the at least two successor nodes () run on the same physical hardware, an identifier of at least one additional node () of the plurality of nodes () which succeeds the at least two successor nodes () with regard to the topology structure of the peer-to-peer overlay network (N) and runs on a different physical hardware than the at least two successor nodes () is added to the successor list (L).

Method of providing a successor list

In order to provide security within a peer-to-peer network () comprising common peers () providing the functionality of the network (), at least one police peer () is added to the network (), said at least one police peer () providing security within the network () and being certified by a central certification authority () managing the certification and positioning of the peers ().

Peer-to-peer network

The application concerns a method for invoking a communication service that is realized by means of a peer of a peer-to-peer system, the method comprising the step of identifying a peer hosting the communication service and invoking the communication service by means of a distributed directory, where the distributed directory carrying entries that enable a client to invoke the communication service, the method further comprising the step of identifying an alternative peer hosting an alternative communication service in case the identified peer or the communication service is unavailable, where the distributed directory carrying entries that enable a client to invoke the alternative communication service. And the application concerns a computer software product and a telecommunication system for providing communication services corresponding to the method.

Method and apparatus for identifying an alternative peer hosting an alternative communication service

Embodiments of the invention concern a method of redundant data storage in a peer-to-peer overlay network (N), and a network node () and a computer program product to execute said method. The peer-to-peer overlay network (N) comprises a plurality of nodes (). A physical hardware on which a first node () of said plurality of nodes () runs is identified. At least one second node () of said plurality of nodes () which runs on a different physical hardware than the first node () is determined. A replica () of data for which the first node () is responsible is stored on the at least one second node () in addition to or instead of storing a replica () of the data on a next logical node () of the first node, whereby said next logical node () is a node of the plurality of nodes () neighboring the first node () with regard to a topology structure of the peer-to-peer overlay network (N).

Method of redundant data storage

The invention concerns a computer software product comprising a plurality of peers () adapted to participate in a peer-to-peer network where the computer software product comprises detection means for detecting actual presence information of a peer and where the computer software product comprises retrieval means for retrieving actual information about the peer, where the detection means is located on neighbor partner peer () of the peer () for detecting continuously whether the peer provides still actual information and the computer software product comprises propagation means for outdating the information about this peer in case of detecting that the peer is not alive. The invention further concerns a network device and a method therefore.

Distributed presence management in peer-to-peer networks

A method for retrieving content of a distributed directory of a telecommunication system comprising a plurality of nodes arranged in a directed ring topology, the method comprising the steps of identifying a storage location of said content by means of a distributed hashing function, where the hashing function maps an element onto a node, where the node is responsible carrying elements with a hash value between the node and its successor node. The invention further concerns a corresponding computer software product, telecommunication device, and a telecommunication system.

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Ditzingen, Germany

Marco Tomsu