Seoul National University

Hybee, Inc.

Jae Seok Bang

Yong Hwan Lee

Jin Seok Han

Yong-Hwan Lee

Hyung Sin Kim

Dong Kwan Kim

Provided is a method for self-constructing a multi-hop cluster-tree structured wireless communication network performed by a terminal device attempts to join a network includes determining at least one parent candidate device, requesting the determined parent candidate devices a network joining, joining the network as a child device based on a decision whether the requested parent candidate device has an address space available for a main transmission link of the terminal device, determining at least one cluster head as reserved parent candidate devices, requesting the determined reserved parent candidate devices a network joining, joining the network as a reserved child device based on a decision whether the requested reserved parent candidate device has an address space available for a reserved transmission link of the terminal device, and constructing a new main transmission link when the terminal device determines that the main transmission link is in an abnormal condition.

Method for self-constructing a multi-hop structured wireless communication network

Provided is a method for increasing the lifetime of devices of a cluster-tree structured multi-hop wireless communication system which uses a battery as the main power and includes an access point (AP) managing network operation and a plurality of devices connected to the AP, wherein some network devices operates as a router capable of having its child devices, the rest of the network device operate as an end device incapable of having its child devices, and the AP, the routers, and the end devices are connected in a parent-child device relationship. The method includes equalizing the average power consumption of each device by exchanging the roles of the router and the end device requiring different power consumption without interrupting normal network operation.

Method for increasing lifetime of network devices in a multi-hop structured wireless communication system

Provided is a method of subscribing, by a terminal, to a network as a router or an end device in a wireless network (WN) having a tree structure including routers and end devices. Each router receives, from a parent router thereof, addresses which are usable independently for child routers and child end devices thereof, and classifies the addresses into a general address and a special address. A terminal wishing to subscribe to a network may subscribe to the network by using a special address of an end device, only when the terminal is unable to subscribe to the network by using a general address of the end device, thereby reducing depletion of addresses to be used for terminal subscription and facilitating network subscription of the end device.

Method of network subscription in a wireless network

Provided is a method of transmitting, by a cluster head (CH), a synchronization signal at each transmission frame in a wireless communication system, where a plurality of cluster networks each including a CH and its devices connected to the CH form a cluster-tree structured network, and each of the plurality of cluster networks synchronously transmits and receives a signal by using a periodic transmission frame comprising a synchronization signal transmitting interval, a data signal transmitting interval, and an idle interval in which no signal is transmitted.

Method for transmission of synchronization signal in a cluster-tree structured wireless communication system

Provided is a network self-healing method in which, when a link between a parent device and a child device breaks down in a wireless communication network of a cluster-tree structure in which a main communication device (referred to an access point (AP)) manages network operation, routers that are devices capable of having their child devices, and end devices that are devices incapable of having their child devices are associated with each other in a parent-child device relationship, the link is restored. When a router becomes an orphan device, the router makes network re-association in a cluster unit while maintaining synchronized operation with its child devices, and thus time, energy and signaling burden for network self-healing is largely reduced.

Method for network self-healing in cluster-tree structured wireless communication networks

Provided is data signal transmitting method and data signal receiving method in a wireless communication system. A method of transmitting and receiving data signal in a wireless communication system by changing a transmission speed and a payload size included in the data signal according to an operation environment is disclosed.

Growing community of inventors

Seoul, South Korea

Jae Seok Bang