Wirepas Oy

Mikko Kohvakka

Marko Hännikäinen

Timo D Hämäläinen

Jukka Suhonen

A node device () of a wireless sensor network comprises a receiver () for receiving transmissions from other nodes. A controller () selectively switches on said receiver () according to a timetable. The node device () maintains synchronization with and receives beacon transmissions from another node in said wireless sensor network. If a failure is observed in previously maintained synchronization, the controller () reads from memory previously received information about neighboring nodes with which said node device () did not yet maintain synchronization. The controller () utilizes such stored information to selectively switch on the receiver () to attempt receiving a beacon transmission from such a neighboring node.

Energy-efficient neighbor discovery for mobile wireless sensor networks

A wireless sensor network, a node device thereof and a method for arranging communications therein are presented. A first frequency is used in wireless communication of information between a headnode and subnodes of a first cluster () using a time slotted channel access scheme. A headnode of a second cluster () known the first frequency and selects a second, different frequency for use in wireless communication of information within said second cluster () using a time slotted channel access scheme. The headnode of the first cluster () is informed about the second frequency selected for the second cluster (). Information from the headnode of said first cluster () to the headnode of said second cluster () is communicated on said second frequency, using the same time slotted channel access scheme as other nodes in said second cluster ().

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Tampere, Finland

Mikko Kohvakka