Network system, server, clients, communication method, and communication computer program product
US7146426B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 2002 |
| Grant date | Dec 5, 2006 |
| Priority date | — |
| Expiry date | Jan 24, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/1685
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
To ensure the polling of a server 11 will reach clients 12 from which an ACK/NACK has not been received despite the change of IP addresses of clients 12 in a network system where an ACK/NACK is to be sent back from each client 12 to the server 11 after file data is transmitted from the server 11 to multiple clients 12 by means of broadcast.Clients 12 in a group are granted identification IDs that are mutually identifiable and permanent. Server 11 send the polling by means of multicast that contains information about permanent IDs of the clients 12 from which it has not received an ACK/NACK. Each of the clients 12 replies with an ACK/NACK if its own permanent ID is contained in the polling, otherwise makes no reply.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.