Distributed presence management in peer-to-peer networks

• US 7,876,698 B2
• Filed: 07/18/2007
• Issued: 01/25/2011
• Est. Priority Date: 07/20/2006
• Status: Expired due to Fees

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Sienel, Jurgen, Tomsu, Marco, Domschitz, Peter
• Primary Examiner(s): Pham, Chi H
• Assistant Examiner(s): LOPATA, ROBERT J
• Application Number:
  US11/779,291
• Publication Number:
  US 20080019291A1
• Time in Patent Office: 1,287 Days
• Field of Search: 370/252, 370/400, 370/389, 370/241, 370/257, 370/258, 370/254, 726/22, 709/227, 709/229
• US Class Current: 370/252
• CPC Class Codes: H04L 67/104 Peer-to-peer [P2P] networks
• CPC Class Codes: H04L 67/1048 Departure or maintenance mechanisms
• CPC Class Codes: H04L 67/54 Presence management, e.g. monitoring or registration for receipt of user log-on information, or the connection status of the users

Abstract

The invention concerns a computer software product comprising a plurality of peers (2′, 4, 5) 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 (4) of the peer (5) 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.

Claims

1. A method for providing actual presence information about a peer of a plurality of peers that form a peer-to-peer network, the peer having a neighbor partner peer, the method comprising:

the neighbor partner peer detecting actual presence information of the peer;

providing and retrieving the actual presence information about the peer;

the neighbor partner peer continuously detecting whether the peer disappears and upon the disappearance of the peer the neighbor partner peer propagating the actual presence information of the disappearance to other peers forming the peer-to-peer network;

the peer providing a list of nodes in the peer-to-peer network which should be informed of the disappearance of the peer; and

the neighbor partner peer propagating the presence information of the peer to the nodes in the list of nodes.

2. The method of claim 1 further comprising:

securing a further neighbor peer to the neighbor partner peer providing redundancy for detecting presence of the peer.

3. The method of claim 1 wherein the plurality of peers in the peer-to-peer network are connected in a Chord ring and further comprising:

the neighbor partner peer propagating the presence information to other peers using the Chord ring, wherein the neighbor partner peer is a predecessor or successor to the peer.

4. The method of claim 1 wherein the list of nodes is stored in a distributed database.

5. The method of claim 4 wherein the distributed database is a distributed hashing table.

6. The method of claim 1 wherein the peer-to-peer network has a hierarchical topology of layers and the neighbor partner peer is located in the same layer as the peer, and wherein the propagating includes propagating the actual presence information through the hierarchy.