Patent application number | Description | Published |
20090154407 | Method of performing routing and allocating resources in wireless sensor network - Provided is a method of performing a routing and allocating a resource in a wireless sensor network. The method includes electing one or more cluster heads, each representing each of one or more clusters comprised of a plurality of sensor nodes, selecting a routing path between the cluster heads and the plurality of sensor nodes, selecting a frame length based on elements and distribution methods of the wireless sensor network and the routing path, forming a time slot resource allocation table for communication between the cluster heads, and exchanging the time slot resource allocation table between the cluster heads separated by one hop. The present invention can enhance the reliability of the wireless sensor network and QoS by effectively performing routing and allocating resources in such a manner that various data requirements can be satisfied. | 06-18-2009 |
20090262689 | METHOD AND APPARATUS FOR ALLOCATING RESOURCES TO A NODE IN AD-HOC NETWORK - A method of allocating resources to a node in an ad-hoc network includes storing a basic frame structure including a predetermined number of time slots, in which time slots to be used by the node in the ad-hoc network are arranged at predetermined positions, determining a start time slot among the predetermined number of time slots included in the basic frame structure based on a path sequence number that is a number related to a position of the node on a routing path, and determining a frame structure including the predetermined number of time slots from the start time slot in the basic frame structure that circulates as a communications frame structure for communications of the node. | 10-22-2009 |
20100131644 | RESOURCE ALLOCATION METHOD IN WIRELESS NETWORK - Provided is a resource allocation method performed in a wireless network formed of a plurality of nodes, the resource allocation method including the operations of forming clusters and electing cluster heads respectively for the clusters; determining whether a node from among the plurality of nodes forming the wireless network is an edge node; if the node is not the edge node according to a result of the determining, collecting link information related to other nodes in a cluster that comprises the node, and delivering the link information to a cluster head of the cluster; and if the node is the edge node according to a result of the determining, otherwise, obtaining link information and scheduling information from an edge node of another cluster within a communication range with the cluster comprising the edge node, and delivering the link information and scheduling information to the cluster head. The resource allocation method decentralizes a load of calculations to several nodes, wherein the load may be centralized to one node in a large ad-hoc network, so that an energy efficiency of the node may be increased, and since the several nodes sequentially perform simple calculation, a total of the resource allocation time may be reduced. | 05-27-2010 |
20100268825 | SCHEDULING METHOD AND SCHEDULING INFORMATION SYNCHRONIZING METHOD IN WIRELESS AD HOC NETWORK - A decentralized scheduling method in a wireless ad hoc network is provided which includes grouping nodes in the network cluster by cluster, determining a cluster head of each cluster, and sequentially performing scheduling cluster by cluster. Accordingly, it is possible to provide an efficient cluster-based scheduling method which is quickly adapt to changes and reduces power consumption. | 10-21-2010 |
20110142159 | METHOD AND APPARATUS FOR HYBRID VIRTUAL MIMO TRANSMISSION IN WIRELESS AD-HOC NETWORK - A hybrid virtual multiple-input multiple-output (V-MIMO) transmission method of a management node in a wireless ad-hoc network in which a transmission path from a source node to a destination node is divided into one or more sections is provided. The hybrid V-MIMO transmission method includes obtaining one or more pieces of node information of one or more nodes by transmitting an information request message to the nodes in response to a transmission request message for data transmission from the source node to the destination node; setting a shortest path (SP) from the source node to the destination node based on the obtained node information; determining transmission schemes individually for nodes present on the SP; issuing a transmission preparation request by transmitting the determined transmission schemes to the respective corresponding nodes; and transmitting a transmission start message to the source node in response to transmission ready responses from the respective nodes. | 06-16-2011 |
20110211559 | DATA FORWARDING METHOD AND SYSTEM FOR VERTICAL HANDOVER - A data forwarding method and system is provided for avoiding data loss during a vertical handover by forwarding data through an IP tunnel established between a newly introduced network entity called a Data Forwarding Function of the serving network and a Forward Attachment Function of a target network. A data forwarding method of a data forwarding unit located in a serving network for a vertical handover according to the present invention includes receiving an address of a forwarding attachment unit located in a target network and a data forwarding preparation request that are transmitted by a user equipment; establishing an Internet Protocol (IP) tunnel to the forwarding attachment unit according to the data forwarding preparation request; and forwarding, when a vertical handover is initiated, handover packets to the forwarding attachment unit through the IP tunnel. | 09-01-2011 |
20120142315 | METHOD FOR AUTHENTICATION AND KEY ESTABLISHMENT IN A MOBILE COMMUNICATION SYSTEM AND METHOD OF OPERATING A MOBILE STATION AND A VISITOR LOCATION REGISTER - The present invention relates to a method whereby the mobile station and a visitor location register create and share a ciphering key and an integrity key in order to directly authenticate each other. The communication method in a mobile communication system such as this includes registering the mobile station with the home location register; and having the mobile station and the visitor location register directly authenticate each other and mutually share a ciphering key and an integrity when the mobile station moves to the visitor location register. | 06-07-2012 |
20120144197 | POINT-TO-POINT COMMUNICATION METHOD IN A WIRELESS SENSOR NETWORK AND METHODS OF DRIVING COORDINATORS AND COMMUNICATION DEVICES IN THE WIRELESS SENSOR NETWORK - The present invention relates to a point-to-point communication method that performs mutual authentication and creates link keys without using a master key. The point-to-point communication method can include authentication by exchanging authentication information between a first node and a second node from among the plural nodes; and having each of the first node and the second node create a link key, after the authentication is completed. During the authentication, the authentication information uses a secret key of a corresponding coordinator (node). | 06-07-2012 |
20120287913 | TRANSMISSION SCHEDULING APPARATUS AND METHOD IN WIRELESS MULTI-HOP NETWORK - In a wireless multi-hop network, a transmission scheduling apparatus calculates a transmission demand of every node within the wireless multi-hop network, and allocates a time slot to each node by using the transmission demand of each node. | 11-15-2012 |
20140036727 | ROUTING METHOD AND APPARATUS FOR SETTING OPTIMUM MULTI-HOP HYBRID V-MIMO TRANSMISSION PATH FOR WIRELESS AD HOC NETWORK - The present invention relates to a method for setting the optimum transmission path for increasing energy efficiency in a wireless ad hoc network. More particularly, the present invention relates to setting an optimized data transmission path in a multi-hop data transmission environment in a wireless network comprising machine to machine (M2M) communication devices, which operate with limited energy, based on link information of the network, such as the position of a node in the network. And to this end, the present invention relates to a wireless M2M communication network protocol minimizing energy consumption by selecting the optimum transmission method for each of the hops from the following transmission methods: a single input single output (SISO) method; a virtual single input multiple output (V-SIMO) method; and a virtual multiple input multiple output (V-MIMO) method. | 02-06-2014 |
20140286278 | METHOD FOR TRANSMITTING AND RECEIVING A SIGNAL IN A WIRELESS COMMUNICATION SYSTEM - One embodiment of the present invention relates to a method for transmitting a signal by a first node in a wireless communication system, including the steps of a first node setting a connection for a reserved transmission and transmitting a signal to a first reception node in the time interval reserved as the connection setting, wherein, in the time interval, a signal transmission is allowed by a second node which is not included in the neighbor nodes of the first reception node. | 09-25-2014 |
20140328263 | DEVICE AND METHOD FOR SCHEDULING PACKET TRANSMISSION - A device and method for scheduling packet transmission are disclosed. The disclosed device includes: an interface unit configured to transmit and receive a packet; a controller configured to calculate a local time and an ARQ time from a packet to be transmitted, where the local time is determined in proportion to a packet delay bound, and the ARQ time is determined based on the local time and the packet delay bound; a queue in which the packet to be transmitted is inputted; and a scheduler configured to determine a transmission order of packets inputted in the queue based on at least one of the local time and the ARQ time. The disclosed device provides the advantage of efficient packet transmission in a multi-hop wireless network. | 11-06-2014 |
20150036570 | METHOD AND APPARATUS FOR TRANSMISSION SCHEDULING IN WIRELESS SENSOR NETWORK - In a sensor network including a sink node and a plurality of sensor nodes, the sink node receives a routing message including routing information from the sensor nodes, analyzes a structure of the sensor network based on routing information, and calculates a transmission schedule of each sensor node based on the analyzed network structure. Schedule information according to the calculated transmission schedule includes a wakeup time of the sensor node, a time interval that is consumed for packet transmission, and a standby time for preventing a packet collision based on the time interval. | 02-05-2015 |