DISTRIBUTION METHOD AND DISTRIBUTION SYSTEM

• US 20120311042A1
• Filed: 06/01/2012
• Published: 12/06/2012
• Est. Priority Date: 06/03/2011
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Maruyama, Joji, Koharagi, Takahiro, Kobayashi, Katsumi, Hayashi, Katsunori, Hirata, Shinichi, Furusawa, Takuji, Kawasumi, Hiroaki, Nozawa, Masaharu
• Granted Patent: US 8,656,036 B2
• Time in Patent Office: Days
• US Class Current: 709/204
• CPC Class Codes: H04L 67/34 involving the movement of software or configuration parameters network booting or remote initial program loading [RIPL] G06F9/4416

Abstract

A distribution method is performed in a distribution system including a distribution source device for distributing data and a plurality of distribution destination devices. The distribution method includes searching, by the distribution source device, for the distribution destination devices by expanding a search range by plural stages; executing in each stage, by the distribution source device, an allowance process of allowing distribution of the data to the distribution destination devices found by searching in each stage; detecting in a predetermined range, by the distribution destination device, another distribution destination device that has acquired the data before the distribution destination device performing the detecting; and executing, by the distribution destination device, an acquiring process of acquiring the data from the other distribution destination device, according to allowance of distribution.

Claims

1. A distribution method performed in a distribution system including a distribution source device for distributing data and a plurality of distribution destination devices, the distribution method comprising:

searching, by the distribution source device, for the distribution destination devices by expanding a search range by plural stages;

executing in each stage, by the distribution source device, an allowance process of allowing distribution of the data to the distribution destination devices found by searching in each stage;

detecting in a predetermined range, by the distribution destination device, another distribution destination device that has acquired the data before the distribution destination device acquires the data; and

executing, by the distribution destination device, an acquiring process of acquiring the data from the another distribution destination device, according to allowance of distribution.

2. The distribution method according to claim 1, further comprising:

transmitting, by the another distribution destination device, the data by broadcasting by a limited number of hops, wherein

the executing of the acquiring process includes acquiring the data that is transmitted by the broadcasting.

3. The distribution method according to claim 1, wherein

the detecting includes detecting, within the predetermined range, the another distribution destination device that has acquired the data in a stage before a stage in which the distribution destination device is found by the searching.

4. The distribution method according to claim 1, wherein

the detecting includes detecting the another distribution destination device based on receiving a message that is broadcast by a limited number of hops within the predetermined range, the message being transmitted by the another distribution destination device in response to acquiring the data.

5. A distribution system comprising:

a distribution source device configured to distribute data; and

a plurality of distribution destination devices, wherein

the distribution source device includes

a searching unit configured to search for the distribution destination devices by expanding a search range by plural stages, and

an allowing unit configured to allow, in each stage, distribution of the data to the distribution destination devices found by the searching unit in each stage, and

the distribution destination device includes

a detecting unit configured to detect, in a predetermined range, another distribution destination device that has acquired the data before the distribution destination device acquires the data, and

an acquiring unit configured to acquire the data from the another distribution destination device, according to allowance of distribution.

6. The distribution system according to claim 5, wherein

the another distribution destination device transmits the data by broadcasting by a limited number of hops, wherein

the acquiring unit acquires the data that is transmitted by the broadcasting.

7. The distribution system according to claim 5, wherein

the detecting unit detects, within the predetermined range, the another distribution destination device that has acquired the data in a stage before a stage in which the distribution destination device is found by the searching unit.

8. The distribution system according to claim 5, wherein

the detecting unit detects the another distribution destination device based on receiving a message that is broadcast by a limited number of hops within the predetermined range, the message being transmitted by the another distribution destination device in response to acquiring the data.