Method and apparatus for grouping mobile nodes in extended wireless LAN
First Claim
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, andwherein 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.
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Accused Products
Abstract
A method and apparatus for grouping wireless access points and re-grouping access points separated from a group in order to construct a clear and efficient transmission connection channel in an extended wireless LAN architecture are provided. Accordingly, a grouped mobile node determines disconnection of a connection channel to the group, and if the connection channel is disconnected, the mobile node searches for a connection channel to the existing group or a new group to re-subscribe thereto, so that all the mobile nodes can always be in a grouped state. As a result, it is possible to prevent broadcast storm in which broadcasted frames are repetitively transmitted along a loop in an extended wireless LAN architecture.
9 Citations
11 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-transitory computer readable recording medium having embodied thereon a computer program for executing 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:
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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.
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11. An apparatus serving as a mobile node having a function of frame-routing in a wireless network, the apparatus comprising:
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a transmission and reception unit which receives a first frame including identification information of a fixed node connecting the wireless network with another network different from the wireless network; a frame processing unit which processes the received frame; a determination unit which determines whether or not to subscribe to a group managed by the fixed node connecting the wireless network with another network different from the wireless network when the frame including identification information of the fixed node is received; a connection channel setting unit which sets a connection channel to the fixed node based on a determination of the determination unit; a transmission unit which transmits the identification information of the mobile node to the fixed node so as to allow the fixed node to register the mobile node as a member of the group; a disconnection detection unit which detects whether or not the set connection channel to the fixed node is disconnected after the fixed node registers the mobile node as a member of the group; and a re-subscription connection channel searching unit which searches for an updated connection channel so as to re-subscribe to the group or another group different from the group when the set connection channel is disconnected, wherein the connection channel searching unit, when the set connection channel to the fixed node is disconnected, searches for a connection channel first so as to re-subscribe to the group managed by the fixed node, and then if searching of the connection channel fails, searches for a connection channel to another group different from the group managed by the fixed node, wherein the identification information of the fixed node informs of the presence of the fixed node, wherein the frame also 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, and wherein the transmission and reception unit receives 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 the frame processing unit selects one of the first frame and the second frame.
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Specification