METHOD AND SYSTEM FOR CONSTRUCTING OVERLAY MULTICAST TREE USING POSITION INFORMATION

摘要

Disclosed are a method and system for constructing an overlay multicast tree using location information. The overlay multicast tree configuration method includes a location information management unit for determining and providing an optimal parent node through communication with a plurality of GPS information providing units. A request step of requesting the location information management unit for an optimal parent node for subscribing to a node; A determination step of determining an optimal parent node from the location information of the GPS information providing units, the physical distance between subscriber stations and the GPS information providing units, and session information currently in progress; And a transmission step of transmitting the determined optimal parent node to the new subscriber station, wherein the determining step comprises: requesting transmission of session information currently in progress and the location information from the location information management unit; Calculating a delay time between the new subscriber station and the GPS information providing units using the location information; And determining, as the optimal parent node, an existing subscriber station participating in a current session among existing subscriber stations belonging to the GPS information providing unit having the shortest delay time from the delay times. This has the effect of providing the best quality of service.