Patent ID: 8295254
Filing Date: 2012-10-23
Classification: H04W

Abstract:
1. A method of allowing a mobile node subscribing in a predetermined group among a plurality of groups, each group constructed with mobile nodes that intercommunicate and have a function of frame-routing in a wireless network, to re-subscribe to any one of the groups, the method comprising: determining whether or not a connection channel of the mobile node to the predetermined group is disconnected; searching other connection channels of the mobile node to the plurality of groups based on a result of the determination; setting an updated connection channel of the mobile node to any one of the plurality of groups based on a result of the searching; and receiving at the mobile node a first frame including identification information of a fixed node in order to inform the mobile node of the presence of the fixed node, wherein the frame includes a sequence number having a value which is different according to a time when the fixed node broadcasts the frame as information for determining whether or not the broadcasted frame is redundantly received by a recipient, wherein the searching comprises, if it is determined that the connection channel to the predetermined group is disconnected, searching connection channels to the predetermined group first, and then if searching of the connection channels to the predetermined group fails, searching connection channels to the other groups, and wherein the method further comprises receiving by the mobile node, a second frame including the identification number of the fixed node and a sequence number having the same value as the value of the first frame via different routing paths to the fixed node and selecting by the mobile node, one of the first frame and the second frame.