Abstract:
Provided is a method of improving a bandwidth of an antenna using a transmission line stub to enable long-range communication together with broadband matching. According to the method, it is possible to combine a transmission line stub in series or parallel with a feeding point, which is an antenna signal input/output point of a body serving as an antenna, and apply the transmission line stub to an antenna for wide use.
Abstract:
A method of configuring a multi-superframe is provided. The method includes setting at least one parameter for configuring the multi-superframe, and configuring the multi-superframe corresponding to the at least one parameter, wherein the at least one parameter includes a superframe order (SO), a beacon order (BO), and a multi-superframe order (MO), in a form of positive integers, and the setting includes setting the MO to have a value higher than the BO.
Abstract:
Disclosed is a manhole type omnidirectional antenna having a relatively small angle between a main beam direction and the Earth's surface and exhibiting omnidirectional characteristics to allow long-range communication, wherein the manhole type omnidirectional antenna includes a manhole cover installed in a manhole in the Earth's surface; a main body installed in a cavity of an upper surface of the manhole cover and configured to convert an electrical signal into an electromagnetic wave to wirelessly communicate with a gateway separated from the manhole cover; and a radome inserted into the cavity to cover the main body.
Abstract:
A method for transmitting and receiving a beacon packet based on multi-channels and a device supporting therefor which generate a beacon packet according to a scheduled super frame by a device, attempt broadcasting of the beacon packet in a beacon slot period of a super frame to a channel set in the super frame, verify whether the set channel is occupied by another device in the beacon slot period, reattempt broadcasting of the beacon packet to the set channel in another predetermined super frame when the set channel is occupied by another device in the beacon slot period, and update a p value according to whether the beacon packet is successfully broadcasted by a transmission probability p value (0
Abstract:
A firmware upgrade apparatus and method are disclosed. A firmware upgrade apparatus according to some embodiments of the present invention includes access points, a relay configured to upload firmware data to the access point, a node configured to upload the firmware data to the relay, and an over-the-air (OTA) access point configured to upload the firmware data to the node.
Abstract:
Provided is a small switchable directional control antenna that can perform direction control according to shapes and sizes of various devices. The antenna includes a dielectric layer, a radiation patch formed on a side of the dielectric layer, a ground plane formed on a side of the dielectric layer opposite to the side on which the radiation patch is formed and configured to have a plurality of slots formed at edges thereof, and a control module insulated from the ground plane and configured to control electrical connection between the radiation patch and the ground plane.
Abstract:
Disclosed are methods for service discovery in a wireless personal area communication network. A method for service discovery, performed in a terminal, the method comprises performing a passive scan for searching a specific service based on whether to receive a frame including a specific service identifier; and, when it fails to search the specific service, performing an active scan which broadcasts a service discovery request command frame for searching the specific service. Thus, service discovery may be efficiently performed by reducing the operation complexity of the terminal and minimizing the power consumption of the terminal needed for service discovery, without support of a upper layer.