TRACKER IN P2 P SYSTEMS WITH DVD FUNCTIONALITIES

• US 20120272282A1
• Filed: 07/23/2009
• Published: 10/25/2012
• Est. Priority Date: 07/23/2009
• Status: Active Grant

• Current Assignee: Telefonica SA
• Original Assignee: Telefonica SA
• Inventors: Rodriguez, Pablo, Yang, Xiaoyaun, Gjoka, Minas, Chhabra, Parminder
• Granted Patent: US 8,868,682 B2
• Time in Patent Office: Days
• US Class Current: 725/116
• CPC Class Codes: H04L 67/104 Peer-to-peer [P2P] networks

Abstract

“A method of optimizing the design of a Tracker in P2P applications to support DVD features, the method including determining for each peer and video operation the time T and jump point P_j, generating a hash key HK_j for each peer, the hash key having a value K_j=(P_j−T)/C, where C>=1 is the granularity of the system, and grouping the peers with the same hash, where the system is designed to provide good viewer experience while supporting DVD features like pause, forward and backward jump operations.”

Claims

1. A method of grouping peers in a P2P system where DVD jump operations can be performed, the method comprising the steps of:

a. determining for each peer and video operation a time T and a jump point P_j

b. generating a hash key H_j for each peer, the hash key having a value H_j=(P_j−

T)/C, where C>

=1 is a granularity of the system

c. grouping peers with the same hash-key.

3. A method according to claims 1, further comprising a step d. wherein a neighborhood of a requesting peer is selected from the group of peers with the same hash key as the requesting peer.

4. A method according to claim 3 wherein if the number of peers in the neighborhood is less than n, in a next step the remaining peers are selected from the neighbors with a hash key greater and close to the hash key of the requesting peer.

5. A method according to claim 3 wherein if the number of peers in the neighborhood is less than n, in a next step the remaining peers are selected from neighbors that have already played a playback segment j of the requesting peer.

6. A method according to claims 4 wherein if the number of peers in the neighborhood is still less than n, in a next step the remaining peers are selected randomly.

7. A P2P system for video applications, the system comprising a tracker adapted to support jump DVD operations, wherein the tracker is adapted to perform the method of claim 1.

8. A method according to claim 5 wherein if the number of peers in the neighborhood is still less than n, in a next step the remaining peers are selected randomly.

2. A method according to claim 2, wherein the hash-key value is updated when the next jump operation is performed.