Lightweight multicast method and apparatus for data distribution service

A lightweight multicast method, comprising:

• multicasting packets to a plurality of subscriber node terminals;
• receiving a negative response message transferred from a relevant subscriber node terminal that could not receive the packets among the plurality of subscriber node terminals;
• detecting a cause of network congestion using the negative response message;
• and
• determining a recovery control policy depending on the cause of the network congestion,
• wherein the detecting the cause of the occurrence of the network congestion comprises,
• detecting a first subscriber congestion reason included in the negative response message,
• receiving second subscriber congestion reasons from a neighboring intermediate node terminal and a neighboring subscriber node terminal included in a route for multicasting of the packets, and
• detecting the cause of the network congestion using the first and second subscriber congestion reasons.

A lightweight multicast method, comprising:

• multicasting packets to a plurality of subscriber node terminals;
• receiving a negative response message transferred from a relevant subscriber node terminal that could not receive the packets among the plurality of subscriber node terminals;
• detecting a cause of network congestion using the negative response message;
• determining a recovery control policy depending on the cause of the network congestion;
• receiving an affirmative response message transferred from a relevant subscriber node terminal received the packets among the plurality of subscriber node terminals;
• and
• deleting information about the relevant subscriber node terminal transferred the affirmative response message from a recovery subscriber list.