MULTICAST APPARATUS AND METHOD

• US 20140351666A1
• Filed: 04/15/2014
• Published: 11/27/2014
• Est. Priority Date: 05/23/2013
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: KIM, Kyeong-Tae, LEE, Soo-Hyung, JUN, Hyung-Kook, KIM, Kyung-Il, KIM, Yong-Yeon, KIM, Won-Tae
• Granted Patent: US 9,385,840 B2
• Time in Patent Office: Days
• US Class Current: 714/748
• CPC Class Codes: H04L 1/1685 the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 2201/08 Algorithms not covered by groups H04L2201/02 - H04L2201/06

Abstract

Disclosed herein are a multicast apparatus and method. In the multicast method, a multicast apparatus searches one or more communication objects in a distributed network environment. Multicast data is received from a sender-side communication object among the one or more communication objects. A polling message is received from the communication object that transmitted the multicast data. A response message corresponding to the polling message is sent. It is determined whether a transmission error has occurred between communication objects based on results of sending of the response message, and multicasting is performed based on results of determination.

Claims

1. A multicast method comprising:

searching, by a multicast apparatus, one or more communication objects in a distributed network environment;

receiving multicast data from a sender-side communication object among the one or more communication objects;

receiving a polling message from the communication object that transmitted the multicast data;

sending a response message corresponding to the polling message; and

determining whether a transmission error has occurred between communication objects based on results of sending of the response message, and performing multicasting based on results of determination.

2. The multicast method of claim 1, wherein sending the response message is configured to send an acknowledge message if the polling message is received, or to send a negative acknowledge message if the polling message is not received.

3. The multicast method of claim 2, wherein performing the multicasting is configured to, if the negative acknowledge message is sent, re-receive multicast data and recover an error.

4. The multicast method of claim 1, wherein receiving the polling message is configured to receive the polling message scheduled using epoch from the communication object that transmitted the multicast data.

5. The multicast method of claim 1, wherein sending the response message is configured to send the response message using feedback scheduling.

6. A multicast apparatus comprising:

a search unit configured to search one or more communication objects in a distributed network environment, and to form a multicast group based on results of search; and

a feedback error control unit configured to receive multicast data and a polling message from a sender-side communication object among the one or more communication objects, to determine whether a transmission error has occurred between communication objects, based on results of sending of a response message corresponding to the received polling message, and to perform multicasting based on results of determination.

7. The multicast apparatus of claim 6, wherein the feedback error control unit comprises:

a multicast data reception unit configured to receive multicast data from a communication object within the multicast group;

a polling message reception unit configured to receive the polling message from the communication object that transmitted the multicast data;

a response transfer unit configured to transfer an acknowledge message or a negative acknowledge message corresponding to reception of the polling message; and

an error recovery unit configured to, if the negative acknowledge message is transferred, re-receive multicast data from the sender-side communication object, and recovering the error.

8. The multicast apparatus of claim 7, wherein the polling message reception unit receives the polling message scheduled using epoch from the communication object that transmitted the multicast data.