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1.发明授权公开(公告)号：US11895603B2
公开(公告)日：2024-02-06
申请号：US17533833
申请日：2021-11-23
Inventor： Tae Joon Park , Eun Hee Kim , Jae Sun Cha , Jung Hoon Oh , Kye Seon Lee
CPC classification number: H04W56/001 , H04W28/04
Abstract: An operation method of an access point (AP) and a terminal, in a wireless time sensitive network (WTSN), may comprise: receiving, by an AP, an uplink frame from a first terminal; generating compensation indication information for compensation to be performed in the first terminal according to channel information between the first terminal and the AP estimated based on the uplink frame; transmitting the compensation indication information to the first terminal through a downlink frame; and performing, by the first terminal, the compensation based on the compensation indication message transmitted through the downlink frame.
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公开(公告)号：US11116022B2
公开(公告)日：2021-09-07
申请号：US16733153
申请日：2020-01-02
Inventor： Wun Cheol Jeong , Eun Hee Kim , Tae Joon Park , Geon Min Yeo , Kye Seon Lee
Abstract: Disclosed are methods and apparatuses for relaying messages in LPWAN. An operation method of a terminal may comprise transmitting a first join request message to a base station without IQ inversion; when a number of failed transmissions of the first join request message is greater than or equal to a preconfigured threshold, transmitting an IQ-inverted second join request message to a relay; and receiving a join response message from the relay that is a response to the second join request message. Accordingly, the performance of the communication system can be improved.
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公开(公告)号：US10333222B2
公开(公告)日：2019-06-25
申请号：US15484449
申请日：2017-04-11
Inventor： Eun Hee Kim , Ju Derk Park , In Hwan Lee , Ho Yong Kang , Jae Heum Lee
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.
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公开(公告)号：US10309077B2
公开(公告)日：2019-06-04
申请号：US15361098
申请日：2016-11-25
Inventor： Eun Hee Kim , Ju Derk Park , In Hwan Lee , Ho Yong Kang , Jae Heum Lee
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.
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