Method for configuring 1:N overlay multicast network of multicast agent in wireless LAN environment and multicast agent therefor
First Claim
1. A method of configuring a 1:
- N overlay multicast network considering a wireless local area network (WLAN) environment of a multicast agent, the method comprising;
a session manger generating a first database with entries of multicast agents subscribing to a session and multicast agents that have applied for subscription to a session but have not been confirmed for normal operation;
a multicast agent generating a second database with entries of a path from the root of a tree to which the multicast agent belongs, a hierarchical relation in the tree, the list of probed neighboring nodes, and a list of not-probed neighboring nodes;
the multicast agent subscribing to the overlay network;
obtaining information on neighboring multicast agents;
setting a multicast agent which is determined to be optimal based on the obtained information, as a parent node; and
if a multicast agent providing a tree improved from the current tree is found, changing the parent node.
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Abstract
A method of configuring a multicast agent and a 1:N overlay multicast network considering a wireless local area network (WLAN) environment of the same are provided. The method includes: a session manger generating a first database with entries of multicast agents subscribing to a session and multicast agents that have applied for subscription to a session but have not been confirmed for normal operation; a multicast agent generating a second database with entries of a path from the root of a tree to which the multicast agent belongs, a hierarchical relation in the tree, the list of probed neighboring nodes, and a list of not-probed neighboring nodes; the multicast agent subscribing to the overlay network; obtaining information on neighboring multicast agents; setting a multicast agent which is determined to be optimal based on the obtained information, as a parent node; and if a multicast agent providing a tree improved from the current tree is found, changing the parent node. According to the method, multicast communication can be easily introduced into a wireless environment without particular modification of existing Internet router equipment.
30 Citations
16 Claims
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1. A method of configuring a 1:
- N overlay multicast network considering a wireless local area network (WLAN) environment of a multicast agent, the method comprising;
a session manger generating a first database with entries of multicast agents subscribing to a session and multicast agents that have applied for subscription to a session but have not been confirmed for normal operation; a multicast agent generating a second database with entries of a path from the root of a tree to which the multicast agent belongs, a hierarchical relation in the tree, the list of probed neighboring nodes, and a list of not-probed neighboring nodes; the multicast agent subscribing to the overlay network; obtaining information on neighboring multicast agents; setting a multicast agent which is determined to be optimal based on the obtained information, as a parent node; and if a multicast agent providing a tree improved from the current tree is found, changing the parent node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- N overlay multicast network considering a wireless local area network (WLAN) environment of a multicast agent, the method comprising;
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10. A method of configuring a 1:
- N overlay multicast network considering a WLAN environment of a multicast agent, the WLAN environment formed of one or more multicast agents, the method comprising;
if a loop is detected based on a heart beat received from a root node, changing a parent node; and if network partitioning is detected based on whether or not the heart beat is periodically received, changing the parent node, and wherein the changing to the new parent node comprises; if the heart beat is not periodically received over a predetermined reference value, determining to recover from partitioning; if the company multicast agent operates normally, examining the operation of a next-higher-level parent node, and if the next-higher-level parent node does not operate, declaring session termination; and if any one of the next-higher-level parent nodes operate, switching the parent nodes.
- N overlay multicast network considering a WLAN environment of a multicast agent, the WLAN environment formed of one or more multicast agents, the method comprising;
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11. A method of configuring a 1:
- N overlay multicast network considering a WLAN environment of a multicast agent of one or more multicast agents forming the 1;
N multicast network in the WLAN environment, the method comprising;receiving a subscription request from a mobile node moving into a region controlled by a current multicast agent; if authentication of the mobile node is successful, obtaining information on a multicast agent to which the mobile node was connected, from the mobile node; according to the information, determining to select as the parent node of the current node, a new multicast agent or the multicast agent to which the mobile node was connected; and performing parent node switching for optimizing a tree. - View Dependent Claims (12, 13)
- N overlay multicast network considering a WLAN environment of a multicast agent of one or more multicast agents forming the 1;
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14. A multicast agent forming a 1:
- N overlay multicast network considering a WLAN environment, the multicast agent comprising;
a first database generated by a session manger with entries of multicast agents subscribing to a session and multicast agents that have applied for subscription to a session but have not been confirmed for normal operation; a second database base generated by the multicast agent with entries of a path from the root of a tree to which the multicast agent belongs, a hierarchical relation in the tree, the list of probed neighboring nodes, and a list of not-probed neighboring nodes; a bootstrapping unit obtaining information on the multicast agents subscribing to the session and operating, in the first database, if a subscription to the session is requested from the session manager and the request is approved; a MAP discovery unit updating the second database by measuring the transmission qualities of the multicast agents, examining the not-probed neighboring nodes, and then updating the list of the probed neighboring nodes with authenticated nodes; a parent node unit selecting a multicast agent optimal for configuring a network based on the information, as a parent node, and switching parent nodes based on periodically updated information. - View Dependent Claims (15, 16)
- N overlay multicast network considering a WLAN environment, the multicast agent comprising;
Specification